/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qabstracteventdispatcher.h"
#include "qaccessible.h"
#include "qapplication.h"
#include "qclipboard.h"
#include "qcursor.h"
#include "qdesktopwidget.h"
#include "qdir.h"
#include "qevent.h"
#include "qfile.h"
#include "qfileinfo.h"
#include "qhash.h"
#include "qset.h"
#include "qlayout.h"
#include "qmessagebox.h"
#include "qsessionmanager.h"
#include "qstyle.h"
#include "qstylefactory.h"
#include "qtextcodec.h"
#include "qtranslator.h"
#include "qvariant.h"
#include "qwidget.h"
#include "qdnd_p.h"
#include "qcolormap.h"
#include "qdebug.h"

#include "qinputcontext.h"
#ifdef Q_WS_X11
#include <private/qt_x11_p.h>
#include "qinputcontextfactory.h"
#endif

#include <qthread.h>
#include <private/qthread_p.h>

#include <private/qfont_p.h>

#include <stdlib.h>

extern void qt_call_post_routines();


#include "qapplication_p.h"
#include "qwidget_p.h"

QApplication::Type qt_appType=QApplication::Tty;
QApplicationPrivate *QApplicationPrivate::self = 0;

QInputContext *QApplicationPrivate::inputContext;

bool QApplicationPrivate::quitOnLastWindowClosed = true;

QApplicationPrivate::QApplicationPrivate(int &argc, char **argv, QApplication::Type type)
    : QCoreApplicationPrivate(argc, argv)
{
    application_type = type;
    qt_appType = type;

#ifndef QT_NO_SESSIONMANAGER
    is_session_restored = false;
#endif

    quitOnLastWindowClosed = true;

#ifdef QT3_SUPPORT
    qt_compat_used = 0;
    qt_compat_resolved = 0;
    qt_tryAccelEvent = 0;
    qt_tryComposeUnicode = 0;
    qt_dispatchAccelEvent = 0;
#endif
    if (!self)
        self = this;
}

QApplicationPrivate::~QApplicationPrivate()
{
    if (self == this)
        self = 0;
}

/*!
  \class QApplication
  \brief The QApplication class manages the GUI application's control
  flow and main settings.

  \ingroup application
  \mainclass

  It contains the main event loop, where all events from the window
  system and other sources are processed and dispatched. It also
  handles the application's initialization and finalization, and
  provides session management. It also handles most system-wide and
  application-wide settings.

  For any GUI application that uses Qt, there is precisely one
  QApplication object, no matter whether the application has 0, 1, 2
  or more windows at any time. For non-GUI Qt applications, use
  QCoreApplication instead, which doesn't depend on the \l QtGui
  library.

  The QApplication object is accessible through the instance()
  function which return a pointer equivalent to the global qApp
  pointer.

  QApplication's main areas of responsibility are:
  \list

  \o It initializes the application with the user's desktop settings
  such as palette(), font() and doubleClickInterval(). It keeps track
  of these properties in case the user changes the desktop globally, for
  example through some kind of control panel.

  \o It performs event handling, meaning that it receives events
  from the underlying window system and dispatches them to the relevant
  widgets. By using sendEvent() and postEvent() you can send your own
  events to widgets.

  \o It parses common command line arguments and sets its internal
  state accordingly. See the \link QApplication::QApplication()
  constructor documentation\endlink below for more details about this.

  \o It defines the application's look and feel, which is
  encapsulated in a QStyle object. This can be changed at runtime
  with setStyle().

  \o It specifies how the application is to allocate colors.
  See setColorSpec() for details.

  \o It provides localization of strings that are visible to the user
  via translate().

  \o It provides some magical objects like the desktop() and the
  clipboard().

  \o It knows about the application's windows. You can ask which
  widget is at a certain position using widgetAt(), get a list of
  topLevelWidgets() and closeAllWindows(), etc.

  \o It manages the application's mouse cursor handling,
  see setOverrideCursor()

  \o On the X window system, it provides functions to flush and sync
  the communication stream, see flushX() and syncX().

  \o It provides support for sophisticated \link
  session.html session management \endlink. This makes it possible
  for applications to terminate gracefully when the user logs out, to
  cancel a shutdown process if termination isn't possible and even to
  preserve the entire application's state for a future session. See
  isSessionRestored(), sessionId() and commitData() and saveState()
  for details.

  \endlist

  Since the QApplication object does so much initialization, it
  \e{must} be created before any other objects related to the user
  interface are created.

  Since it also deals with common command line arguments, it is
  usually a good idea to create it \e before any interpretation or
  modification of \c argv is done in the application itself.

  \table
    \header \o{2,1} Groups of functions
    \row
     \o System settings
     \o
        desktopSettingsAware(),
        setDesktopSettingsAware(),
        cursorFlashTime(),
        setCursorFlashTime(),
        doubleClickInterval(),
        setDoubleClickInterval(),
        setKeyboardInputInterval(),
        wheelScrollLines(),
        setWheelScrollLines(),
        palette(),
        setPalette(),
        font(),
        setFont(),
        fontMetrics().

    \row
     \o Event handling
     \o
        exec(),
        processEvents(),
        exit(),
        quit().
        sendEvent(),
        postEvent(),
        sendPostedEvents(),
        removePostedEvents(),
        hasPendingEvents(),
        notify(),
        macEventFilter(),
        qwsEventFilter(),
        x11EventFilter(),
        x11ProcessEvent(),
        winEventFilter().

    \row
     \o GUI Styles
     \o
        style(),
        setStyle().

    \row
     \o Color usage
     \o
        colorSpec(),
        setColorSpec(),
        qwsSetCustomColors().

    \row
     \o Text handling
     \o
        installTranslator(),
        removeTranslator()
        translate().

    \row
     \o Widgets
     \o
        allWidgets(),
        topLevelWidgets(),
        desktop(),
        activePopupWidget(),
        activeModalWidget(),
        clipboard(),
        focusWidget(),
        winFocus(),
        activeWindow(),
        widgetAt().

    \row
     \o Advanced cursor handling
     \o
        overrideCursor(),
        setOverrideCursor(),
        restoreOverrideCursor().

    \row
     \o X Window System synchronization
     \o
        flushX(),
        syncX().

    \row
     \o Session management
     \o
        isSessionRestored(),
        sessionId(),
        commitData(),
        saveState().

    \row
     \o Miscellaneous
     \o
        closeAllWindows(),
        startingUp(),
        closingDown(),
        type().
  \endtable

    \sa QCoreApplication, QAbstractEventDispatcher, QEventLoop, QSettings
*/

/*!
    \enum QApplication::Type

    \value Tty a console application
    \value GuiClient a GUI client application
    \value GuiServer a GUI server application (for Qtopia Core)
*/

/*!
    \enum QApplication::ColorSpec

    \value NormalColor the default color allocation policy
    \value CustomColor the same as NormalColor for X11; allocates colors
    to a palette on demand under Windows
    \value ManyColor the right choice for applications that use thousands of
    colors

    See setColorSpec() for full details.
*/

/*!
    \fn QWidget *QApplication::topLevelAt(const QPoint &point)

    Returns the top-level widget at the given \a point; returns 0 if
    there is no such widget.
*/
/*!
    \fn QWidget *QApplication::topLevelAt(int x, int y)

    \overload

    Returns the top-level widget at the point (\a{x}, \a{y}); returns
    0 if there is no such widget.
*/


/*
  The qt_init() and qt_cleanup() functions are implemented in the
  qapplication_xyz.cpp file.
*/

void qt_init(QApplicationPrivate *priv, int type
#ifdef Q_WS_X11
              , Display *display = 0, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0
#endif
   );
void qt_cleanup();

Qt::MouseButtons QApplicationPrivate::mouse_buttons = Qt::NoButton;
Qt::KeyboardModifiers QApplicationPrivate::modifier_buttons = Qt::NoModifier;

QStyle *QApplicationPrivate::app_style = 0;        // default application style

int QApplicationPrivate::app_cspec = QApplication::NormalColor;
QPalette *QApplicationPrivate::app_pal = 0;        // default application palette
QPalette *QApplicationPrivate::sys_pal = 0;        // default system palette
QPalette *QApplicationPrivate::set_pal = 0;        // default palette set by programmer
QFont *QApplicationPrivate::app_font = 0;        // default application font
bool qt_app_has_font = false;
QIcon *QApplicationPrivate::app_icon = 0;
QWidget *QApplicationPrivate::main_widget = 0;        // main application widget
QWidget *QApplicationPrivate::focus_widget = 0;        // has keyboard input focus
QWidget *QApplicationPrivate::active_window = 0;        // toplevel with keyboard focus
bool QApplicationPrivate::obey_desktop_settings = true;        // use winsys resources
int QApplicationPrivate::cursor_flash_time = 1000;        // text caret flash time
int QApplicationPrivate::mouse_double_click_time = 400;        // mouse dbl click limit
int QApplicationPrivate::keyboard_input_time = 400; // keyboard input interval
#ifndef QT_NO_WHEELEVENT
int QApplicationPrivate::wheel_scroll_lines = 3;                // number of lines to scroll
#endif
bool qt_is_gui_used;
bool Q_GUI_EXPORT qt_tab_all_widgets = true;
bool qt_in_tab_key_event = false;
QRect Q_GUI_EXPORT qt_maxWindowRect;
static int drag_time = 500;
static int drag_distance = 4;
static Qt::LayoutDirection layout_direction = Qt::LeftToRight;
QSize QApplicationPrivate::app_strut = QSize(0,0); // no default application strut
bool QApplicationPrivate::animate_ui = true;
bool QApplicationPrivate::animate_menu = false;
bool QApplicationPrivate::fade_menu = false;
bool QApplicationPrivate::animate_combo = false;
bool QApplicationPrivate::animate_tooltip = false;
bool QApplicationPrivate::fade_tooltip = false;
bool QApplicationPrivate::animate_toolbox = false;
bool QApplicationPrivate::widgetCount = false;
QString* QApplicationPrivate::styleOverride = 0;
#ifdef QT_KEYPAD_NAVIGATION
bool QApplicationPrivate::keypadNavigation = false;
QWidget *QApplicationPrivate::oldEditFocus = 0;
#endif

bool qt_tabletChokeMouse = false;
static bool force_reverse = false;

Q_GUI_EXPORT void qt_qws_set_max_window_rect(const QRect& r)
{
    qt_maxWindowRect = r;
    // Re-resize any maximized windows
    QWidgetList l = QApplication::topLevelWidgets();
    for (int i = 0; i < l.size(); ++i) {
        QWidget *w = l.at(i);
        if (w->isVisible() && w->isMaximized()) {
            w->showNormal(); //#### flicker
            w->showMaximized();
        }
    }
}

// ######## move to QApplicationPrivate
// Default application palettes and fonts (per widget type)

typedef QHash<QByteArray, QPalette> PaletteHash;
Q_GLOBAL_STATIC(PaletteHash, app_palettes)
PaletteHash *qt_app_palettes_hash()
{
    return app_palettes();
}

typedef QHash<QByteArray, QFont> FontHash;
Q_GLOBAL_STATIC(FontHash, app_fonts)
FontHash *qt_app_fonts_hash()
{
    return app_fonts();
}

QWidgetList *QApplicationPrivate::popupWidgets = 0;        // has keyboard input focus

QDesktopWidget *qt_desktopWidget = 0;                // root window widgets
#ifndef QT_NO_CLIPBOARD
QClipboard              *qt_clipboard = 0;        // global clipboard object
#endif
QWidgetList * qt_modal_stack=0;                // stack of modal widgets

/*!
    \internal
*/
void QApplicationPrivate::process_cmdline()
{
    Q_Q(QApplication);
    // process platform-indep command line
    if (!qt_is_gui_used || !argc)
        return;

    int i, j;

    j = 1;
    for (i=1; i<argc; i++) { // if you add anything here, modify QCoreApplication::arguments()
        if (argv[i] && *argv[i] != '-') {
            argv[j++] = argv[i];
            continue;
        }
        QByteArray arg = argv[i];
        arg = arg;
        QString s;
        if (arg == "-qdevel" || arg == "-qdebug") {
            // obsolete argument
        } else if (arg.indexOf("-style=", 0) != -1) {
            s = QString::fromLocal8Bit(arg.right(arg.length() - 7).toLower());
        } else if (arg == "-style" && i < argc-1) {
            s = QString::fromLocal8Bit(argv[++i]).toLower();
#ifndef QT_NO_SESSIONMANAGER
        } else if (arg == "-session" && i < argc-1) {
            ++i;
            if (argv[i] && *argv[i]) {
                session_id = QString::fromLatin1(argv[i]);
                int p = session_id.indexOf(QLatin1Char('_'));
                if (p >= 0) {
                    session_key = session_id.mid(p +1);
                    session_id = session_id.left(p);
                }
                is_session_restored = true;
            }
#endif
        } else if (qstrcmp(arg, "-reverse") == 0) {
            force_reverse = true;
            q->setLayoutDirection(Qt::RightToLeft);
        } else if (qstrcmp(arg, "-widgetcount") == 0) {
            widgetCount = true;
        } else {
            argv[j++] = argv[i];
        }
        if (!s.isEmpty()) {
            if (!styleOverride)
                styleOverride = new QString;
            *styleOverride = s;
        }
    }

    if(j < argc) {
        argv[j] = 0;
        argc = j;
    }
}

/*!
  Initializes the window system and constructs an application object
  with \a argc command line arguments in \a argv.

  The global \c qApp pointer refers to this application object. Only
  one application object should be created.

  This application object must be constructed before any \link
  QPaintDevice paint devices\endlink (including widgets, pixmaps, bitmaps
  etc.).

  Note that \a argc and \a argv might be changed. Qt removes command
  line arguments that it recognizes. The original \a argc and \a argv
  can be accessed later with \c qApp->argc() and \c qApp->argv().
  The documentation for argv() contains a detailed description of how
  to process command line arguments.

  Qt debugging options (not available if Qt was compiled without the
  QT_DEBUG flag defined):
  \list
  \o -nograb, tells Qt that it must never grab the mouse or the keyboard.
  \o -dograb (only under X11), running under a debugger can cause
  an implicit -nograb, use -dograb to override.
  \o -sync (only under X11), switches to synchronous mode for
        debugging.
  \endlist

  See \link debug.html Debugging Techniques \endlink for a more
  detailed explanation.

  All Qt programs automatically support the following command line options:
  \list
  \o -style= \e style, sets the application GUI style. Possible values
       are \c motif, \c windows, and \c platinum. If you compiled Qt
       with additional styles or have additional styles as plugins these
       will be available to the \c -style command line option.
  \o -style \e style, is the same as listed above.
  \o -session= \e session, restores the application from an earlier
       \link session.html session \endlink.
  \o -session \e session, is the same as listed above.
  \o -widgetcount, prints debug message at the end about number of widgets left
       undestroyed and maximum number of widgets existed at the same time
  \endlist

  The X11 version of Qt also supports some traditional X11
  command line options:
  \list
  \o -display \e display, sets the X display (default is $DISPLAY).
  \o -geometry \e geometry, sets the client geometry of the
        first window that is shown.
  \o -fn or \c -font \e font, defines the application font. The
  font should be specified using an X logical font description.
  \o -bg or \c -background \e color, sets the default background color
        and an application palette (light and dark shades are calculated).
  \o -fg or \c -foreground \e color, sets the default foreground color.
  \o -btn or \c -button \e color, sets the default button color.
  \o -name \e name, sets the application name.
  \o -title \e title, sets the application title.
  \o -visual \c TrueColor, forces the application to use a TrueColor visual
       on an 8-bit display.
  \o -ncols \e count, limits the number of colors allocated in the
       color cube on an 8-bit display, if the application is using the
       QApplication::ManyColor color specification. If \e count is
       216 then a 6x6x6 color cube is used (i.e. 6 levels of red, 6 of green,
       and 6 of blue); for other values, a cube
       approximately proportional to a 2x3x1 cube is used.
  \o -cmap, causes the application to install a private color map
       on an 8-bit display.
  \endlist

  \sa argc(), argv()
*/

QApplication::QApplication(int &argc, char **argv)
    : QCoreApplication(*new QApplicationPrivate(argc, argv, GuiClient))
{ Q_D(QApplication); d->construct(); }


/*!
    Constructs an application object with \a argc command line arguments
    in \a argv. If \a GUIenabled is true, a GUI application is
    constructed, otherwise a non-GUI (console) application is created.

    Set \a GUIenabled to false for programs without a graphical user
    interface that should be able to run without a window system.

    On X11, the window system is initialized if \a GUIenabled is true.
    If \a GUIenabled is false, the application does not connect to the
    X server. On Windows and Macintosh, currently the window system is
    always initialized, regardless of the value of GUIenabled. This may
    change in future versions of Qt.

    The following example shows how to create an application that
    uses a graphical interface when available.

    \code
        int main(int argc, char **argv)
        {
        #ifdef Q_WS_X11
            bool useGUI = getenv("DISPLAY") != 0;
        #else
            bool useGUI = true;
        #endif
            QApplication app(argc, argv, useGUI);

            if (useGUI) {
               // start GUI version
               ...
            } else {
               // start non-GUI version
               ...
            }
            return app.exec();
        }
    \endcode
*/

QApplication::QApplication(int &argc, char **argv, bool GUIenabled )
    : QCoreApplication(*new QApplicationPrivate(argc, argv, GUIenabled ? GuiClient : Tty))
{ Q_D(QApplication); d->construct(); }

/*!
  Constructs an application object with \a argc command line arguments
  in \a argv.

  For Qtopia Core, passing QApplication::GuiServer for \a type
  makes this application the server (equivalent to running with the
  \c -qws option).
*/
QApplication::QApplication(int &argc, char **argv, Type type)
    : QCoreApplication(*new QApplicationPrivate(argc, argv, type))
{ Q_D(QApplication); d->construct(); }

/*!
    \internal
*/
void QApplicationPrivate::construct()
{
    Q_INIT_RESOURCE(qstyle);

    qt_is_gui_used = (qt_appType != QApplication::Tty);
    process_cmdline();
    qt_init(this, qt_appType);   // Must be called before initialize()
    initialize();
    if (qt_is_gui_used)
        qt_maxWindowRect = QApplication::desktop()->rect();
    eventDispatcher->startingUp();

#ifdef QT_EVAL
    extern void qt_gui_eval_init(uint);
    qt_gui_eval_init(application_type);
#endif
}

#if defined(Q_WS_X11)
// ### a string literal is a cont char*
// ### using it as a char* is wrong and could lead to segfaults
// ### if aargv is modified someday
// ########## make it work with argc == argv == 0
static int aargc = 1;
static char *aargv[] = { (char*)"unknown", 0 };

/*!
  \fn QApplication::QApplication(Display* display, Qt::HANDLE visual, Qt::HANDLE colormap)

  Create an application, given an already open display \a display. If \a
  visual and \a colormap are non-zero, the application will use those as
  the default Visual and Colormap contexts.

  \warning Qt only supports TrueColor visuals at depths higher than 8
  bits-per-pixel.

  This is available only on X11.
*/
QApplication::QApplication(Display* dpy, Qt::HANDLE visual, Qt::HANDLE colormap)
    : QCoreApplication(*new QApplicationPrivate(aargc, aargv, GuiClient))
{
    Q_D(QApplication);
    qt_is_gui_used = true;
    // ... no command line.

    if (! dpy)
        qWarning("QApplication: invalid Display* argument.");

    qt_init(d, GuiClient, dpy, visual, colormap);

    d->initialize();

    if (qt_is_gui_used)
        qt_maxWindowRect = desktop()->rect();
    d->eventDispatcher->startingUp();
}

/*!
  \fn QApplication::QApplication(Display *display, int &argc, char **argv,
                           Qt::HANDLE visual, Qt::HANDLE colormap)

  Create an application, given an already open \a display and using \a
  argc command line arguments in \a argv. If \a visual and \a colormap
  are non-zero, the application will use those as the default Visual
  and Colormap contexts.

  \warning Qt only supports TrueColor visuals at depths higher than 8
  bits-per-pixel.

  This is available only on X11.

*/
QApplication::QApplication(Display *dpy, int &argc, char **argv,
                           Qt::HANDLE visual, Qt::HANDLE colormap)
    : QCoreApplication(*new QApplicationPrivate(argc, argv, GuiClient))
{
    Q_D(QApplication);
    qt_is_gui_used = true;

    if (! dpy)
        qWarning("QApplication: invalid Display* argument.");
    qt_init(d, GuiClient, dpy, visual, colormap);

    d->process_cmdline();
    d->initialize();

    if (qt_is_gui_used)
        qt_maxWindowRect = desktop()->rect();
    d->eventDispatcher->startingUp();
}


#endif // Q_WS_X11


/*!
  Initializes the QApplication object, called from the constructors.
*/

void QApplicationPrivate::initialize()
{
    Q_Q(QApplication);
    QWidgetPrivate::mapper = new QWidgetMapper;
    if (qt_appType != QApplication::Tty)
        (void) QApplication::style();  // trigger creation of application style
    // trigger registering of QVariant's GUI types
    extern int qRegisterGuiVariant();
    qRegisterGuiVariant();

    is_app_running = true; // no longer starting up

#ifndef QT_NO_SESSIONMANAGER
    // connect to the session manager
    session_manager = new QSessionManager(q, session_id, session_key);
#endif

}

/*!
    Returns the type of application (\l Tty, GuiClient, or
    GuiServer). The type is set when constructing the QApplication
    object.
*/
QApplication::Type QApplication::type()
{
    return qt_appType;
}

/*****************************************************************************
  Functions returning the active popup and modal widgets.
 *****************************************************************************/

/*!
  Returns the active popup widget.

  A popup widget is a special top-level widget that sets the \c
  Qt::WType_Popup widget flag, e.g. the QMenu widget. When the
  application opens a popup widget, all events are sent to the popup.
  Normal widgets and modal widgets cannot be accessed before the popup
  widget is closed.

  Only other popup widgets may be opened when a popup widget is shown.
  The popup widgets are organized in a stack. This function returns
  the active popup widget at the top of the stack.

  \sa activeModalWidget(), topLevelWidgets()
*/

QWidget *QApplication::activePopupWidget()
{
    return QApplicationPrivate::popupWidgets && !QApplicationPrivate::popupWidgets->isEmpty() ?
        QApplicationPrivate::popupWidgets->last() : 0;
}


/*!
  Returns the active modal widget.

  A modal widget is a special top-level widget which is a subclass of
  QDialog that specifies the modal parameter of the constructor as
  true. A modal widget must be closed before the user can continue
  with other parts of the program.

  Modal widgets are organized in a stack. This function returns
  the active modal widget at the top of the stack.

  \sa activePopupWidget(), topLevelWidgets()
*/

QWidget *QApplication::activeModalWidget()
{
    return qt_modal_stack && !qt_modal_stack->isEmpty() ? qt_modal_stack->first() : 0;
}

/*!
  Cleans up any window system resources that were allocated by this
  application. Sets the global variable \c qApp to 0.
*/

QApplication::~QApplication()
{
    Q_D(QApplication);
#ifndef QT_NO_CLIPBOARD
    // flush clipboard contents
    if (qt_clipboard) {
        QEvent event(QEvent::Clipboard);
        QApplication::sendEvent(qt_clipboard, &event);
    }
#endif

    //### this should probable be done even later
    qt_call_post_routines();

    // kill timers before closing down the dispatcher
    d->toolTipWakeUp.stop();
    d->toolTipFallAsleep.stop();

    d->eventDispatcher->closingDown();
    d->eventDispatcher = 0;

    delete qt_desktopWidget;
    qt_desktopWidget = 0;
    QApplicationPrivate::is_app_closing = true;

#ifndef QT_NO_CLIPBOARD
    delete qt_clipboard;
    qt_clipboard = 0;
#endif

    // delete widget mapper
    if (QWidgetPrivate::mapper) {
        QWidgetMapper * myMapper = QWidgetPrivate::mapper;
        QWidgetPrivate::mapper = 0;
        for (QWidgetMapper::Iterator it = myMapper->begin(); it != myMapper->end(); ++it) {
            register QWidget *w = *it;
            if (!w->parent())                        // widget is a parent
                w->destroy(true, true);
        }
        delete myMapper;
    }

    delete QApplicationPrivate::app_pal;
    QApplicationPrivate::app_pal = 0;
    delete QApplicationPrivate::sys_pal;
    QApplicationPrivate::sys_pal = 0;
    delete QApplicationPrivate::set_pal;
    QApplicationPrivate::set_pal = 0;
    app_palettes()->clear();
    delete QApplicationPrivate::app_font;
    QApplicationPrivate::app_font = 0;
    app_fonts()->clear();
    delete QApplicationPrivate::app_style;
    QApplicationPrivate::app_style = 0;
    delete QApplicationPrivate::app_icon;
    QApplicationPrivate::app_icon = 0;
#ifndef QT_NO_CURSOR
    d->cursor_list.clear();
#endif

#ifndef QT_NO_DRAGANDDROP
    if (qt_is_gui_used)
        delete QDragManager::self();
#endif

    qt_cleanup();

    if (QApplicationPrivate::widgetCount)
        qDebug("Widgets left: %i    Max widgets: %i \n", QWidgetPrivate::instanceCounter, QWidgetPrivate::maxInstances);
#ifndef QT_NO_SESSIONMANAGER
    delete d->session_manager;
    d->session_manager = 0;
#endif //QT_NO_SESSIONMANAGER

    qt_app_has_font = false;
    QApplicationPrivate::obey_desktop_settings = true;
    QApplicationPrivate::cursor_flash_time = 1000;
    QApplicationPrivate::mouse_double_click_time = 400;
    QApplicationPrivate::keyboard_input_time = 400;
#ifndef QT_NO_WHEELEVENT
    QApplicationPrivate::wheel_scroll_lines = 3;
#endif
    drag_time = 500;
    drag_distance = 4;
    layout_direction = Qt::LeftToRight;
    QApplicationPrivate::app_strut = QSize(0, 0);
    QApplicationPrivate::animate_ui = true;
    QApplicationPrivate::animate_menu = false;
    QApplicationPrivate::fade_menu = false;
    QApplicationPrivate::animate_combo = false;
    QApplicationPrivate::animate_tooltip = false;
    QApplicationPrivate::fade_tooltip = false;
    QApplicationPrivate::widgetCount = false;
}


/*!
    \fn QWidget *QApplication::widgetAt(const QPoint &point)

    Returns the widget at global screen position \a point, or 0 if there
    is no Qt widget there.

    This function can be slow.

    \sa QCursor::pos(), QWidget::grabMouse(), QWidget::grabKeyboard()
*/
QWidget *QApplication::widgetAt(const QPoint &p)
{
    QWidget *window = QApplication::topLevelAt(p);
    if (!window)
        return 0;

    QWidget *child = 0;

    if (!window->testAttribute(Qt::WA_TransparentForMouseEvents))
        child = window->childAt(window->mapFromGlobal(p));

    if (child)
        return child;

    if (window->testAttribute(Qt::WA_TransparentForMouseEvents)) {
        //shoot a hole in the widget and try once again,
        //suboptimal on Qt/E where we do know the stacking order
        //of the toplevels.
        int x = p.x();
        int y = p.y();
        QRegion oldmask = window->mask();
        QPoint wpoint = window->mapFromGlobal(QPoint(x, y));
        QRegion newmask = (oldmask.isEmpty() ? QRegion(window->rect()) : oldmask)
                          - QRegion(wpoint.x(), wpoint.y(), 1, 1);
        window->setMask(newmask);
        QWidget *recurse = 0;
        if (QApplication::topLevelAt(p) != window) // verify recursion will terminate
            recurse = widgetAt(x, y);
        if (oldmask.isEmpty())
            window->clearMask();
        else
            window->setMask(oldmask);
        return recurse;
    }
    return window;
}

/*!
    \fn QWidget *QApplication::widgetAt(int x, int y)

    \overload

    Returns the widget at global screen position (\a x, \a y), or 0
    if there is no Qt widget there.
*/

/*!
    \fn void QApplication::setArgs(int argc, char **argv)
    \internal
*/



/*!
    \internal
*/
bool QApplication::compressEvent(QEvent *event, QObject *receiver, QPostEventList *postedEvents)
{
    if ((event->type() == QEvent::UpdateRequest
#ifdef QT3_SUPPORT
          || event->type() == QEvent::LayoutHint
#endif
          || event->type() == QEvent::LayoutRequest
          || event->type() == QEvent::Resize
          || event->type() == QEvent::Move
          || event->type() == QEvent::LanguageChange
	  || event->type() == QEvent::InputMethod)) {
        for (int i = 0; i < postedEvents->size(); ++i) {
            const QPostEvent &cur = postedEvents->at(i);
            if (cur.receiver != receiver || cur.event == 0 || cur.event->type() != event->type())
                continue;
            if (cur.event->type() == QEvent::LayoutRequest
#ifdef QT3_SUPPORT
                 || cur.event->type() == QEvent::LayoutHint
#endif
                 || cur.event->type() == QEvent::UpdateRequest) {
                ;
            }
            else if (cur.event->type() == QEvent::Resize) {
                ((QResizeEvent *)(cur.event))->s = ((QResizeEvent *)event)->s;
            } else if (cur.event->type() == QEvent::Move) {
                ((QMoveEvent *)(cur.event))->p = ((QMoveEvent *)event)->p;
            } else if (cur.event->type() == QEvent::LanguageChange) {
                ;
	    } else if ( cur.event->type() == QEvent::InputMethod ) {
                *(QInputMethodEvent *)(cur.event) = *(QInputMethodEvent *)event;
            } else {
                continue;
            }
            return true;
        }
        return false;
    }
    return QCoreApplication::compressEvent(event, receiver, postedEvents);
}

/*!
  Returns the application's style object.

  \sa setStyle(), QStyle
*/
QStyle *QApplication::style()
{
    if (QApplicationPrivate::app_style)
        return QApplicationPrivate::app_style;
    if (!qt_is_gui_used)
        qFatal("No style available in non-gui applications!");

#if defined(Q_WS_X11)
    if(!QApplicationPrivate::styleOverride)
        QApplicationPrivate::x11_initialize_style(); // run-time search for default style
#endif
    if (!QApplicationPrivate::app_style) {
        // Compile-time search for default style
        //
        QString style;
        if (QApplicationPrivate::styleOverride) {
            style = *QApplicationPrivate::styleOverride;
            delete QApplicationPrivate::styleOverride;
            QApplicationPrivate::styleOverride = 0;
        } else {
#  if defined(Q_WS_WIN) && defined(Q_OS_TEMP)
            style = QLatin1String("PocketPC");
#elif defined(Q_WS_WIN)
            if ((QSysInfo::WindowsVersion >= QSysInfo::WV_XP
                && QSysInfo::WindowsVersion < QSysInfo::WV_NT_based))
                style = QLatin1String("WindowsXP");
            else
                style = QLatin1String("Windows");                // default styles for Windows
#elif defined(Q_WS_X11) && defined(Q_OS_SOLARIS)
            style = QLatin1String("CDE");                        // default style for X11 on Solaris
#elif defined(Q_WS_X11) && defined(Q_OS_IRIX)
            style = QLatin1String("SGI");                        // default style for X11 on IRIX
#elif defined(Q_WS_X11)
                style = QLatin1String("Motif");                // default style for X11
#elif defined(Q_WS_MAC)
                style = QLatin1String("Macintosh");                // default style for all Mac's
#elif defined(Q_WS_QWS)
            style = QLatin1String("Plastique");                // default style for small devices
#endif
        }

        QStyle *&app_style = QApplicationPrivate::app_style;
        app_style = QStyleFactory::create(style);
        if (!app_style) {
            QStringList styles = QStyleFactory::keys();
            for (int i = 0; i < styles.size(); ++i) {
                if ((app_style = QStyleFactory::create(styles.at(i))))
                    break;
            }
        }
        if (!app_style)
            qFatal("No styles available!");
    }

    if (!QApplicationPrivate::sys_pal)
        QApplicationPrivate::setSystemPalette(QApplicationPrivate::app_style->standardPalette());
    if (QApplicationPrivate::set_pal) // repolish set palette with the new style
        QApplication::setPalette(*QApplicationPrivate::set_pal);


    QApplicationPrivate::app_style->polish(qApp);
    return QApplicationPrivate::app_style;
}

/*!
    Sets the application's GUI style to \a style. Ownership of the style
    object is transferred to QApplication, so QApplication will delete
    the style object on application exit or when a new style is set.

    \warning To ensure that the application's style is set correctly, it
    is best to call this function before the QApplication constructor,
    if possible.

    Example usage:
    \code
        QApplication::setStyle(new QWindowsStyle);
    \endcode

    When switching application styles, the color palette is set back to
    the initial colors or the system defaults. This is necessary since
    certain styles have to adapt the color palette to be fully
    style-guide compliant.

    Note that setting the style before a palette has been set
    (i.e. before creating QApplication) will cause the application to
    use QStyle::standardPalette() for the palette.

    \sa style(), QStyle, setPalette(), desktopSettingsAware()
*/
void QApplication::setStyle(QStyle *style)
{
    if (!style || style == QApplicationPrivate::app_style)
        return;

    QStyle* old = QApplicationPrivate::app_style;
    QApplicationPrivate::app_style = style;

    // clean up the old style
    if (old) {
        if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
            for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin(); it != QWidgetPrivate::mapper->constEnd(); ++it) {
                register QWidget *w = *it;
                if (!(w->windowType() == Qt::Desktop) &&        // except desktop
                     w->testAttribute(Qt::WA_WState_Polished)) { // has been polished
                    old->unpolish(w);
                }
            }
        }
        old->unpolish(qApp);
    }

    // take care of possible palette requirements of certain gui
    // styles. Do it before polishing the application since the style
    // might call QApplication::setStyle() itself
    if (QApplicationPrivate::set_pal) {
        QApplication::setPalette(*QApplicationPrivate::set_pal);
    } else if (QApplicationPrivate::sys_pal) {
        QApplicationPrivate::initializeWidgetPaletteHash();
        QApplicationPrivate::setPalette_helper(*QApplicationPrivate::sys_pal, /*className=*/0, /*clearWidgetPaletteHash=*/false);
    } else if (!QApplicationPrivate::sys_pal) {
        // Initialize the sys_pal if it hasn't happened yet...
        QApplicationPrivate::setSystemPalette(QApplicationPrivate::app_style->standardPalette());
    }

    // initialize the application with the new style
    QApplicationPrivate::app_style->polish(qApp);

    // re-polish existing widgets if necessary
    if (old) {
        if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
            for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin(); it != QWidgetPrivate::mapper->constEnd(); ++it) {
                register QWidget *w = *it;
                if (!(w->windowType() == Qt::Desktop)) {        // except desktop
                    if (w->testAttribute(Qt::WA_WState_Polished))
                        QApplicationPrivate::app_style->polish(w);                // repolish
                    QEvent e(QEvent::StyleChange);
                    QApplication::sendEvent(w, &e);
#ifdef QT3_SUPPORT
                    w->styleChange(*old);
#endif
                    w->update();
                }
            }
        }
        delete old;
    }
    if (QApplicationPrivate::focus_widget) {
        QFocusEvent in(QEvent::FocusIn, Qt::OtherFocusReason);
        QApplication::sendEvent(QApplicationPrivate::focus_widget->style(), &in);
        QApplicationPrivate::focus_widget->update();
    }
}

/*!
  \overload

  Requests a QStyle object for \a style from the QStyleFactory.

  The string must be one of the QStyleFactory::keys(), typically one
  of "windows", "motif", "cde", "plastique", "windowsxp", or
  "macintosh".

  Returns 0 if an unknown \a style is passed, otherwise the QStyle object
  returned is set as the application's GUI style.

  \warning To ensure that the application's style is set correctly, it is
  best to call this function before the QApplication constructor, if
  possible.
*/
QStyle* QApplication::setStyle(const QString& style)
{
    QStyle *s = QStyleFactory::create(style);
    if (!s)
        return 0;

    setStyle(s);
    return s;
}

/*!
  Returns the color specification.
  \sa QApplication::setColorSpec()
 */

int QApplication::colorSpec()
{
    return QApplicationPrivate::app_cspec;
}

/*!
  Sets the color specification for the application to \a spec.

  The color specification controls how the application allocates colors
  when run on a display with a limited amount of colors, e.g. 8 bit / 256
  color displays.

  The color specification must be set before you create the QApplication
  object.

  The options are:
  \list
  \o QApplication::NormalColor.
    This is the default color allocation strategy. Use this option if
    your application uses buttons, menus, texts and pixmaps with few
    colors. With this option, the application uses system global
    colors. This works fine for most applications under X11, but on
    Windows machines it may cause dithering of non-standard colors.
  \o QApplication::CustomColor.
    Use this option if your application needs a small number of custom
    colors. On X11, this option is the same as NormalColor. On Windows, Qt
    creates a Windows palette, and allocates colors to it on demand.
  \o QApplication::ManyColor.
    Use this option if your application is very color hungry
    (e.g. it requires thousands of colors).
    Under X11 the effect is:
    \list
    \o For 256-color displays which have at best a 256 color true
       color visual, the default visual is used, and colors are
       allocated from a color cube. The color cube is the 6x6x6 (216
       color) "Web palette" (the red, green, and blue components
       always have one of the following values: 0x00, 0x33, 0x66,
       0x99, 0xCC, or 0xFF), but the number of colors can be changed
       by the \e -ncols option. The user can force the application to
       use the true color visual with the \link
       QApplication::QApplication() -visual \endlink option.
    \o For 256-color displays which have a true color visual with more
       than 256 colors, use that visual. Silicon Graphics X servers
       have this feature, for example. They provide an 8 bit visual
       by default but can deliver true color when asked.
    \endlist
    On Windows, Qt creates a Windows palette, and fills it with a color cube.
  \endlist

  Be aware that the CustomColor and ManyColor choices may lead to colormap
  flashing: The foreground application gets (most) of the available
  colors, while the background windows will look less attractive.

  Example:

    \code
        int main(int argc, char *argv[])
        {
            QApplication::setColorSpec(QApplication::ManyColor);
            QApplication app(argc, argv);
            ...
            return app.exec();
        }
    \endcode

    \sa colorSpec()
*/

void QApplication::setColorSpec(int spec)
{
    if (qApp)
        qWarning("QApplication::setColorSpec: This function must be "
                 "called before the QApplication object is created");
    QApplicationPrivate::app_cspec = spec;
}

/*!
    \property QApplication::globalStrut
    \brief the minimum size that any GUI element that the user can interact
           with should have

    For example no button should be resized to be smaller than the
    global strut size. The strut size should be considered when
    reimplementing GUI controls that may be used on touch-screens or
    similar I/O devices.

    Example:

    \code
        QSize MyWidget::sizeHint() const
        {
            return QSize(80, 25).expandedTo(QApplication::globalStrut());
        }
    \endcode
*/
QSize QApplication::globalStrut()
{
    return QApplicationPrivate::app_strut;
}

void QApplication::setGlobalStrut(const QSize& strut)
{
    QApplicationPrivate::app_strut = strut;
}

/*!
    Returns the application palette.

    \sa setPalette(), QWidget::palette()
*/
QPalette QApplication::palette()
{
    QApplicationPrivate::checkInstance("palette");
    if (!QApplicationPrivate::app_pal)
        QApplicationPrivate::app_pal = new QPalette(Qt::black);
    return *QApplicationPrivate::app_pal;
}

/*!
    \fn QPalette QApplication::palette(const QWidget* widget)
    \overload

    If a \a widget is passed, the default palette for the
    widget's class is returned. This may or may not be the application
    palette. In most cases there isn't a special palette for certain
    types of widgets, but one notable exception is the popup menu
    under Windows, if the user has defined a special background color
    for menus in the display settings.

    \sa setPalette(), QWidget::palette()
*/
QPalette QApplication::palette(const QWidget* w)
{
    PaletteHash *hash = app_palettes();
    if (w && hash && hash->size()) {
        QHash<QByteArray, QPalette>::ConstIterator it = hash->find(w->metaObject()->className());
        if (it != hash->constEnd())
            return *it;
        for (it = hash->constBegin(); it != hash->constEnd(); ++it) {
            if (w->inherits(it.key()))
                return it.value();
        }
    }
    return palette();
}

/*!
    \overload

    Returns the palette for widgets of the given \a className.

    \sa setPalette(), QWidget::palette()
*/
QPalette QApplication::palette(const char *className)
{
    if (!QApplicationPrivate::app_pal)
        palette();
    PaletteHash *hash = app_palettes();
    if (className && hash && hash->size()) {
        QHash<QByteArray, QPalette>::ConstIterator it = hash->find(className);
        if (it != hash->constEnd())
            return *it;
    }
    return *QApplicationPrivate::app_pal;
}

void QApplicationPrivate::setPalette_helper(const QPalette &palette, const char* className, bool clearWidgetPaletteHash)
{
    QPalette pal = palette;

    if (QApplicationPrivate::app_style)
        QApplicationPrivate::app_style->polish(pal); // NB: non-const reference

    bool all = false;
    PaletteHash *hash = app_palettes();
    if (!className) {
        if (QApplicationPrivate::app_pal && pal.isCopyOf(*QApplicationPrivate::app_pal))
            return;
        if (!QApplicationPrivate::app_pal)
            QApplicationPrivate::app_pal = new QPalette(pal);
        else
            *QApplicationPrivate::app_pal = pal;
        if (hash && hash->size()) {
            all = true;
            if (clearWidgetPaletteHash)
                hash->clear();
        }
    } else if (hash) {
        hash->insert(className, pal);
    }

    if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
        QEvent e(QEvent::ApplicationPaletteChange);
        for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin();
             it != QWidgetPrivate::mapper->constEnd(); ++it) {
            register QWidget *w = *it;
            if (all || (!className && w->isWindow()) || w->inherits(className)) // matching class
                QApplication::sendEvent(w, &e);
        }
    }
    if (!className && (!QApplicationPrivate::sys_pal || !palette.isCopyOf(*QApplicationPrivate::sys_pal))) {
        if (!QApplicationPrivate::set_pal)
            QApplicationPrivate::set_pal = new QPalette(palette);
        else
            *QApplicationPrivate::set_pal = palette;
    }
}

/*!
  Changes the default application palette to \a palette.

  If \a className is passed, the change applies only to widgets that
  inherit \a className (as reported by QObject::inherits()). If
  \a className is left 0, the change affects all widgets, thus overriding
  any previously set class specific palettes.

  The palette may be changed according to the current GUI style in
  QStyle::polish().

  \sa QWidget::setPalette(), palette(), QStyle::polish()
*/

void QApplication::setPalette(const QPalette &palette, const char* className)
{
    QApplicationPrivate::setPalette_helper(palette, className, /*clearWidgetPaletteHash=*/ true);
}



void QApplicationPrivate::setSystemPalette(const QPalette &pal)
{
    QPalette adjusted;

#if 0
    // adjust the system palette to avoid dithering
    QColormap cmap = QColormap::instance();
    if (cmap.depths() > 4 && cmap.depths() < 24) {
        for (int g = 0; g < QPalette::NColorGroups; g++)
            for (int i = 0; i < QPalette::NColorRoles; i++) {
                QColor color = pal.color((QPalette::ColorGroup)g, (QPalette::ColorRole)i);
                color = cmap.colorAt(cmap.pixel(color));
                adjusted.setColor((QPalette::ColorGroup)g, (QPalette::ColorRole) i, color);
            }
    }
#else
    adjusted = pal;
#endif

    if (!sys_pal)
        sys_pal = new QPalette(adjusted);
    else
        *sys_pal = adjusted;


    if (!QApplicationPrivate::set_pal)
        QApplication::setPalette(*sys_pal);
}

/*!
  \fn QFont QApplication::font(const QWidget *widget)

  Returns the default font for the \a widget, or the default
  application font if \a widget is 0.

  \sa setFont(), fontMetrics(), QWidget::font()
*/

QFont QApplication::font(const QWidget *w)
{
    FontHash *hash = app_fonts();
    if (w && hash  && hash->size()) {
        QHash<QByteArray, QFont>::ConstIterator it =
            hash->find(w->metaObject()->className());
        if (it != hash->constEnd())
            return it.value();
        for (it = hash->begin(); it != hash->end(); ++it) {
            if (w->inherits(it.key()))
                return it.value();
        }
    }
    if (!QApplicationPrivate::app_font)
        QApplicationPrivate::app_font = new QFont(QLatin1String("Helvetica"));
    return *QApplicationPrivate::app_font;
}

/*! Changes the default application font to \a font.  If \a className
  is passed, the change applies only to classes that inherit \a
  className (as reported by QObject::inherits()).

  On application start-up, the default font depends on the window
  system. It can vary depending on both the window system version and
  the locale. This function lets you override the default font; but
  overriding may be a bad idea because, for example, some locales need
  extra-large fonts to support their special characters.

  \sa font(), fontMetrics(), QWidget::setFont()
*/

void QApplication::setFont(const QFont &font, const char* className)
{
    bool all = false;
    FontHash *hash = app_fonts();
    if (!className) {
        qt_app_has_font = true;
        if (!QApplicationPrivate::app_font)
            QApplicationPrivate::app_font = new QFont(font);
        else
            *QApplicationPrivate::app_font = font;
        if (hash && hash->size()) {
            all = true;
            hash->clear();
        }
    } else if (hash) {
        hash->insert(className, font);
    }
    if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
        QEvent e(QEvent::ApplicationFontChange);
        for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin();
             it != QWidgetPrivate::mapper->constEnd(); ++it) {
            register QWidget *w = *it;
            if (all || (!className && w->isWindow()) || w->inherits(className)) // matching class
                sendEvent(w, &e);
        }
    }
}

/*!
    \property QApplication::windowIcon
    \brief the default window icon

    \sa QWidget::setWindowIcon(), {Setting the Application Icon}
*/
QIcon QApplication::windowIcon()
{
    return QApplicationPrivate::app_icon ? *QApplicationPrivate::app_icon : QIcon();
}

void QApplication::setWindowIcon(const QIcon &icon)
{
    if (!QApplicationPrivate::app_icon)
        QApplicationPrivate::app_icon = new QIcon();
    *QApplicationPrivate::app_icon = icon;
    if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
#ifdef Q_WS_MAC
        void qt_mac_set_app_icon(const QPixmap &); //qapplication_mac.cpp
        QSize size = QApplicationPrivate::app_icon->actualSize(QSize(64, 64));
        qt_mac_set_app_icon(QApplicationPrivate::app_icon->pixmap(size));
#endif
        QEvent e(QEvent::ApplicationWindowIconChange);
        for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin();
             it != QWidgetPrivate::mapper->constEnd(); ++it) {
            register QWidget *w = *it;
            if (w->isWindow())
                sendEvent(w, &e);
        }
    }
}

/*!
    Returns a list of the top-level widgets (windows) in the
    application.

    Note that some of the top-level widgets may be hidden, for
    example a tooltip if no tooltip is currently shown.

    Example:

    \code
        void showAllHiddenTopLevelWidgets()
        {
            foreach (QWidget *widget, QApplication::topLevelWidgets()) {
                if (widget->isHidden())
                    widget->show();
            }
        }
    \endcode

    \sa allWidgets(), QWidget::isWindow(), QWidget::isHidden()
*/
QWidgetList QApplication::topLevelWidgets()
{
    QWidgetList list;
    if (QWidgetPrivate::mapper) {
        for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin();
             it != QWidgetPrivate::mapper->constEnd(); ++it) {
            QWidget *w = *it;
            if (w->isWindow())
                list.append(w);
        }
    }
    return list;
}

/*!
    Returns a list of all the widgets in the application.

    The list is empty (QList::isEmpty()) if there are no widgets.

    Note that some of the widgets may be hidden.

    Example:
    \code
        void updateAllWidgets()
        {
            foreach (QWidget *widget, QApplication::allWidgets())
                widget->update();
        }
    \endcode

    \sa topLevelWidgets(), QWidget::isVisible()
*/

QWidgetList QApplication::allWidgets()
{
    QWidgetList list;
    if (QWidgetPrivate::mapper) {
        for (QWidgetMapper::ConstIterator it = QWidgetPrivate::mapper->constBegin();
             it != QWidgetPrivate::mapper->constEnd(); ++it)
            list.append(*it);
    }
    return list;
}

/*!
  Returns the application widget that has the keyboard input focus, or
  0 if no widget in this application has the focus.

  \sa QWidget::setFocus(), QWidget::hasFocus(), activeWindow(), focusChanged()
*/

QWidget *QApplication::focusWidget()
{
    return QApplicationPrivate::focus_widget;
}

void QApplicationPrivate::setFocusWidget(QWidget *focus, Qt::FocusReason reason)
{
    if (focus != focus_widget) {
        if (focus && (reason == Qt::BacktabFocusReason || reason == Qt::TabFocusReason)
            && qt_in_tab_key_event)
            focus->window()->setAttribute(Qt::WA_KeyboardFocusChange);
        QWidget *prev = focus_widget;
        focus_widget = focus;

        if (reason != Qt::NoFocusReason) {

            //send events
            if (prev) {
#ifdef QT_KEYPAD_NAVIGATION
                if (QApplication::keypadNavigationEnabled()) {
                    if (prev->hasEditFocus())
                        prev->setEditFocus(false);
                }
#endif
                QFocusEvent out(QEvent::FocusOut, reason);
                QApplication::sendEvent(prev, &out);
                QApplication::sendEvent(prev->style(), &out);
            }
            if(focus && QApplicationPrivate::focus_widget == focus) {
                QFocusEvent in(QEvent::FocusIn, reason);
                QApplication::sendEvent(focus, &in);
                QApplication::sendEvent(focus->style(), &in);
            }
        }
        emit qApp->focusChanged(prev, focus_widget);
    }
}


/*!
  Returns the application top-level window that has the keyboard input
  focus, or 0 if no application window has the focus. Note that
  there might be an activeWindow() even if there is no focusWidget(),
  for example if no widget in that window accepts key events.

  \sa QWidget::setFocus(), QWidget::hasFocus(), focusWidget()
*/

QWidget *QApplication::activeWindow()
{
    return QApplicationPrivate::active_window;
}

/*!
  Returns display (screen) font metrics for the application font.

  \sa font(), setFont(), QWidget::fontMetrics(), QPainter::fontMetrics()
*/

QFontMetrics QApplication::fontMetrics()
{
    return desktop()->fontMetrics();
}


/*!
    Closes all top-level windows.

    This function is particularly useful for applications with many
    top-level windows. It could, for example, be connected to a
    \gui{Exit} entry in the \gui{File} menu:

    \quotefromfile mainwindows/mdi/mainwindow.cpp
    \skipto exitAct = new QAct
    \printuntil SLOT(closeAllWindows())

    The windows are closed in random order, until one window does not
    accept the close event. The application quits when the last window
    was successfully closed; this can be turned of by setting \l
    quitOnLastWindowClosed to false.

    \sa quitOnLastWindowClosed, lastWindowClosed()  QWidget::close(), QWidget::closeEvent(), lastWindowClosed(),
        quit(), topLevelWidgets(), QWidget::isWindow()
*/
void QApplication::closeAllWindows()
{
    bool did_close = true;
    QWidget *w;
    while((w = activeModalWidget()) && did_close) {
        if(!w->isVisible())
            break;
        did_close = w->close();
    }
    QWidgetList list = QApplication::topLevelWidgets();
    for (int i = 0; did_close && i < list.size(); ++i) {
        w = list.at(i);
        if (w->isVisible() && w->windowType() != Qt::Desktop) {
            did_close = w->close();
            list = QApplication::topLevelWidgets();
            i = -1;
        }
    }
}

/*!
    Displays a simple message box about Qt. The message includes the
    version number of Qt being used by the application.

    This is useful for inclusion in the Help menu of an application.
    See the examples/menu/menu.cpp example.

    This function is a convenience slot for QMessageBox::aboutQt().
*/
void QApplication::aboutQt()
{
#ifndef QT_NO_MESSAGEBOX
    QMessageBox::aboutQt(activeWindow());
#endif // QT_NO_MESSAGEBOX
}


/*!
    \fn void QApplication::lastWindowClosed()

    This signal is emitted from QApplication::exec() when the last
    visible primary window (i.e. window with no parent) with the
    Qt::WA_QuitOnClose attribute set is closed.

    By default,

    \list

    \i this attribute is set for all widgets except transient windows
    such as splash screens, tool windows, and popup menus

    \i QApplication implicitly quits when this signal is emitted.

    \endlist

    This feature be turned off by setting \l quitOnLastWindowClosed to
    false.

    \sa QWidget::close()
*/

/*!
    \since 4.1
    \fn void QApplication::focusChanged(QWidget *old, QWidget *now)

    This signal is emitted when the widget that has keyboard focus
    changed from \a old to \a now, i.e. because the user presse the
    tab-key, clicked into a widget or changed the active window. Note
    that both \a old and \a now can be the null-pointer.

    The signal is emitted after both widget have been notified about
    the change through QFocusEvent.

    \sa QWidget::setFocus() QWidget::clearFocus() Qt::FocusReason
*/

#ifndef QT_NO_TRANSLATION
static bool qt_detectRTLLanguage()
{
    return force_reverse ^
        QApplication::tr("QT_LAYOUT_DIRECTION",
                         "Translate this string to the string 'LTR' in left-to-right"
                         " languages or to 'RTL' in right-to-left languages (such as Hebrew"
                         " and Arabic) to get proper widget layout.") == QLatin1String("RTL");
}
#endif

/*!\reimp

*/
bool QApplication::event(QEvent *e)
{
    Q_D(QApplication);
    if(e->type() == QEvent::Close) {
        QCloseEvent *ce = static_cast<QCloseEvent*>(e);
        ce->accept();
        closeAllWindows();

        QWidgetList list = topLevelWidgets();
        for (int i = 0; i < list.size(); ++i) {
            QWidget *w = list.at(i);
            if (w->isVisible() && !(w->windowType() == Qt::Desktop) && !(w->windowType() == Qt::Popup) &&
                 (!(w->windowType() == Qt::Dialog) || !w->parentWidget())) {
                ce->ignore();
                break;
            }
        }
        if(ce->isAccepted())
            return true;
    } else if(e->type() == QEvent::LanguageChange) {
#ifndef QT_NO_TRANSLATION
        setLayoutDirection(qt_detectRTLLanguage()?Qt::RightToLeft:Qt::LeftToRight);
#endif
        QWidgetList list = topLevelWidgets();
        for (int i = 0; i < list.size(); ++i) {
            QWidget *w = list.at(i);
            if (!(w->windowType() == Qt::Desktop))
                postEvent(w, new QEvent(QEvent::LanguageChange));
        }
    } else if (e->type() == QEvent::Timer) {
        QTimerEvent *te = static_cast<QTimerEvent*>(e);
        Q_ASSERT(te != 0);
        if (te->timerId() == d->toolTipWakeUp.timerId()) {
            d->toolTipWakeUp.stop();
            d->toolTipFallAsleep.start(2000, this);
            if (d->toolTipWidget) {
                QHelpEvent e(QEvent::ToolTip, d->toolTipPos, d->toolTipGlobalPos);
                QApplication::sendEvent(d->toolTipWidget, &e);
            }
        } else if (te->timerId() == d->toolTipFallAsleep.timerId()) {
            d->toolTipFallAsleep.stop();
        }
    }
    return QCoreApplication::event(e);
}
#if !defined(Q_WS_X11)

// The doc and X implementation of this function is in qapplication_x11.cpp

void QApplication::syncX()        {}                // do nothing

#endif

/*!
    \fn Qt::WindowsVersion QApplication::winVersion()

    Use \l QSysInfo::WindowsVersion instead.
*/

/*!
    \fn void QApplication::setActiveWindow(QWidget* active)

    Sets the active window to the \a active widget in response to a system
    event. The function is called from the platform specific event
    handlers.

    \warning This function does \e not set the keyboard focus to the
    active widget. Call QWidget::activateWindow() instead.

    It sets the activeWindow() and focusWidget() attributes and sends
    proper \l{QEvent::WindowActivate}{WindowActivate}/\l{QEvent::WindowDeactivate}{WindowDeactivate}
    and \l{QEvent::FocusIn}{FocusIn}/\l{QEvent::FocusOut}{FocusOut} events
    to all appropriate widgets. The window will then be painted in
    active state (e.g. cursors in line edits will blink), and it will
    have tool tips enabled.

    \sa activeWindow(), QWidget::activateWindow()
*/
void QApplication::setActiveWindow(QWidget* act)
{
    QWidget* window = act?act->window():0;

    if (QApplicationPrivate::active_window == window)
        return;

    // first the activation/deactivation events
    QEvent ae(QEvent::ActivationChange);
    if (QApplicationPrivate::active_window) {
        QWidgetList deacts;
        if (style()->styleHint(QStyle::SH_Widget_ShareActivation, 0, QApplicationPrivate::active_window)) {
            QWidgetList list = topLevelWidgets();
            for (int i = 0; i < list.size(); ++i) {
                QWidget *w = list.at(i);
                if (w->isVisible() && w->isActiveWindow())
                    deacts.append(w);
            }
        } else
            deacts.append(QApplicationPrivate::active_window);
        QApplicationPrivate::active_window = 0;
        QEvent e(QEvent::WindowDeactivate);
        for(int i = 0; i < deacts.size(); ++i) {
            QWidget *w = deacts.at(i);
            sendSpontaneousEvent(w, &e);
            sendSpontaneousEvent(w, &ae);
        }
    }

    QApplicationPrivate::active_window = window;
    if (QApplicationPrivate::active_window) {
        QEvent e(QEvent::WindowActivate);
        QWidgetList acts;
        if (style()->styleHint(QStyle::SH_Widget_ShareActivation, 0, QApplicationPrivate::active_window)) {
            QWidgetList list = topLevelWidgets();
            for (int i = 0; i < list.size(); ++i) {
                QWidget *w = list.at(i);
                if (w->isVisible() && w->isActiveWindow())
                    acts.append(w);
            }
        } else
            acts.append(QApplicationPrivate::active_window);
        for (int i = 0; i < acts.size(); ++i) {
            QWidget *w = acts.at(i);
            sendSpontaneousEvent(w, &e);
            sendSpontaneousEvent(w, &ae);
        }
    }

    // then focus events
    if (!QApplicationPrivate::active_window && QApplicationPrivate::focus_widget) {
	focusWidget()->d_func()->unfocusInputContext();
        QApplicationPrivate::setFocusWidget(0, Qt::ActiveWindowFocusReason);
    } else if (QApplicationPrivate::active_window) {
        QWidget *w = QApplicationPrivate::active_window->focusWidget();
        if (w /*&& w->focusPolicy() != QWidget::NoFocus*/)
            w->setFocus(Qt::ActiveWindowFocusReason);
        else
            QApplicationPrivate::active_window->focusNextPrevChild(true);
    }
}


/*!\internal

  Creates the proper Enter/Leave event when widget \a enter is entered
  and widget \a leave is left.
 */
void QApplicationPrivate::dispatchEnterLeave(QWidget* enter, QWidget* leave) {
#if 0
    if (leave) {
        QEvent e(QEvent::Leave);
        QApplication::sendEvent(leave, & e);
    }
    if (enter) {
        QEvent e(QEvent::Enter);
        QApplication::sendEvent(enter, & e);
    }
    return;
#endif

    QWidget* w ;
    if (!enter && !leave)
        return;
    QWidgetList leaveList;
    QWidgetList enterList;

    bool sameWindow = leave && enter && leave->window() == enter->window();
    if (leave && !sameWindow) {
        w = leave;
        do {
            leaveList.append(w);
        } while (!w->isWindow() && (w = w->parentWidget()));
    }
    if (enter && !sameWindow) {
        w = enter;
        do {
            enterList.prepend(w);
        } while (!w->isWindow() && (w = w->parentWidget()));
    }
    if (sameWindow) {
        int enterDepth = 0;
        int leaveDepth = 0;
        w = enter;
        while (!w->isWindow() && (w = w->parentWidget()))
            enterDepth++;
        w = leave;
        while (!w->isWindow() && (w = w->parentWidget()))
            leaveDepth++;
        QWidget* wenter = enter;
        QWidget* wleave = leave;
        while (enterDepth > leaveDepth) {
            wenter = wenter->parentWidget();
            enterDepth--;
        }
        while (leaveDepth > enterDepth) {
            wleave = wleave->parentWidget();
            leaveDepth--;
        }
        while (!wenter->isWindow() && wenter != wleave) {
            wenter = wenter->parentWidget();
            wleave = wleave->parentWidget();
        }

        w = leave;
        while (w != wleave) {
            leaveList.append(w);
            w = w->parentWidget();
        }
        w = enter;
        while (w != wenter) {
            enterList.prepend(w);
            w = w->parentWidget();
        }
    }

    QEvent leaveEvent(QEvent::Leave);
    for (int i = 0; i < leaveList.size(); ++i) {
        w = leaveList.at(i);
        if (!qApp->activeModalWidget() || QApplicationPrivate::tryModalHelper(w, 0)) {
            QApplication::sendEvent(w, &leaveEvent);
            if (w->testAttribute(Qt::WA_Hover)) {
                Q_ASSERT(instance());
                QHoverEvent he(QEvent::HoverLeave, QPoint(-1, -1), w->mapFromGlobal(QApplicationPrivate::instance()->hoverGlobalPos));
                qApp->d_func()->notify_helper(w, &he);
            }
        }
    }
    QPoint posEnter = QCursor::pos();
    QEvent enterEvent(QEvent::Enter);
    for (int i = 0; i < enterList.size(); ++i) {
        w = enterList.at(i);
        if (!qApp->activeModalWidget() || QApplicationPrivate::tryModalHelper(w, 0)) {
            QApplication::sendEvent(w, &enterEvent);
            if (w->testAttribute(Qt::WA_Hover)) {
                QHoverEvent he(QEvent::HoverEnter, w->mapFromGlobal(posEnter), QPoint(-1, -1));
                qApp->d_func()->notify_helper(w, &he);
            }
        }
    }
}

/* exported for the benefit of testing tools */
Q_GUI_EXPORT bool qt_tryModalHelper(QWidget *widget, QWidget **rettop)
{
    return QApplicationPrivate::tryModalHelper(widget, rettop);
}

/*! \internal
    Returns true if \a widget is blocked by a modal window.
 */
bool QApplicationPrivate::isBlockedByModal(QWidget *widget)
{
    widget = widget->window();
    if (!modalState())
        return false;
    if (qApp->activePopupWidget() == widget)
        return false;
    if ((widget->windowType() == Qt::Tool)) {
        // allow tool windows
        return false;
    }

    bool blocked = false;
    for (int i = 0; !blocked && i < qt_modal_stack->size(); ++i) {
        QWidget *modalWidget = qt_modal_stack->at(i);

        // check if the active modal widget is a parent of our widget
        QWidget *w = widget->parentWidget();
        while (w) {
            if (w == modalWidget)
                return false;
            w = w->parentWidget();
        }
#ifdef Q_WS_WIN
        if (IsChild(modalWidget->winId(), widget->winId()))
            return false;
#endif

        Qt::WindowModality windowModality = modalWidget->windowModality();
        if (windowModality == Qt::NonModal) {
            // determine the modality type if it hasn't been set on the
            // modalWidget, this normally happens when waiting for a
            // native dialog. use WindowModal if we are the child of a
            // group leader; otherwise use ApplicationModal.
            w = modalWidget;
            while (w && !w->testAttribute(Qt::WA_GroupLeader)) {
                w = w->parentWidget();
                if (w)
                    w = w->window();
            }
            windowModality = (w && w->testAttribute(Qt::WA_GroupLeader))
                             ? Qt::WindowModal
                             : Qt::ApplicationModal;
        }

        switch (windowModality) {
        case Qt::ApplicationModal:
            if (modalWidget == widget)
                return false;
            if (modalWidget != widget)
                blocked = true;
            break;
        case Qt::WindowModal:
            w = widget;
            do {
                QWidget *top = modalWidget;
                do {
                    if (top == w && modalWidget != widget) {
                        blocked = true;
                        break;
                    }
                    top = top->parentWidget();
                    if (top)
                        top = top->window();
                } while (!blocked && top);
                w = w->parentWidget();
                if (w)
                    w = w->window();
            } while (!blocked && w);
            break;
        default:
            Q_ASSERT_X(false, "QApplication", "internal error, a modal widget cannot be modeless");
            break;
        }
    }
    return blocked;
}

/*!\internal
 */
void QApplicationPrivate::enterModal(QWidget *widget)
{
    QSet<QWidget*> blocked;
    QList<QWidget*> windows = qApp->topLevelWidgets();
    for (int i = 0; i < windows.count(); ++i) {
        QWidget *window = windows.at(i);
        if (isBlockedByModal(window))
            blocked.insert(window);
    }

    enterModal_sys(widget);

    windows = qApp->topLevelWidgets();
    QEvent e(QEvent::WindowBlocked);
    for (int i = 0; i < windows.count(); ++i) {
        QWidget *window = windows.at(i);
        if (!blocked.contains(window) && isBlockedByModal(window))
            QApplication::sendEvent(window, &e);
    }
}

/*!\internal
 */
void QApplicationPrivate::leaveModal(QWidget *widget)
{
    QSet<QWidget*> blocked;
    QList<QWidget*> windows = qApp->topLevelWidgets();
    for (int i = 0; i < windows.count(); ++i) {
        QWidget *window = windows.at(i);
        if (isBlockedByModal(window))
            blocked.insert(window);
    }

    leaveModal_sys(widget);

    windows = qApp->topLevelWidgets();
    QEvent e(QEvent::WindowUnblocked);
    for (int i = 0; i < windows.count(); ++i) {
        QWidget *window = windows.at(i);
        if(blocked.contains(window) && !isBlockedByModal(window))
            QApplication::sendEvent(window, &e);
    }
}



/*!\internal

  Called from qapplication_\e{platform}.cpp, returns true
  if the widget should accept the event.
 */
bool QApplicationPrivate::tryModalHelper(QWidget *widget, QWidget **rettop)
{
    QWidget *top = QApplication::activeModalWidget();
    if (rettop)
        *rettop = top;

    widget = widget->window();
    if (qApp->activePopupWidget() == widget)
        return true;

#ifdef Q_WS_MAC
    top = QApplicationPrivate::tryModalHelper_sys(top);
    if (rettop)
        *rettop = top;
#endif

    return !isBlockedByModal(widget);
}


/*!
    Returns the desktop widget (also called the root window).

    The desktop widget is useful for obtaining the size of the screen.
    It may also be possible to draw on the desktop. We recommend against
    assuming that it's possible to draw on the desktop, since this does
    not work on all operating systems.

    Example:

    \code
        QDesktopWidget *desktop = QApplication::desktop();
        int width = desktop->width();
        int height = desktop->height();
    \endcode
*/
QDesktopWidget *QApplication::desktop()
{
    if (!qt_desktopWidget || // not created yet
         !(qt_desktopWidget->windowType() == Qt::Desktop)) { // reparented away
        qt_desktopWidget = new QDesktopWidget();
    }
    return qt_desktopWidget;
}

#ifndef QT_NO_CLIPBOARD
/*!
  Returns a pointer to the application global clipboard.
*/
QClipboard *QApplication::clipboard()
{
    if (qt_clipboard == 0) {
        qt_clipboard = new QClipboard(0);
    }
    return qt_clipboard;
}
#endif // QT_NO_CLIPBOARD

/*!
    Sets whether Qt should use the system's standard colors, fonts,
    etc., to \a on. By default, this is true.

    This function must be called before creating the QApplication
    object, like this:

    \code
        int main(int argc, char *argv[])
        {
            QApplication::setDesktopSettingsAware(false);
            QApplication app(argc, argv);
            ...
            return app.exec();
        }
    \endcode

    \sa desktopSettingsAware()
*/
void QApplication::setDesktopSettingsAware(bool on)
{
    QApplicationPrivate::obey_desktop_settings = on;
}

/*!
    Returns true if Qt is set to use the system's standard colors,
    fonts, etc.; otherwise returns false. The default is true.

    \sa setDesktopSettingsAware()
*/
bool QApplication::desktopSettingsAware()
{
    return QApplicationPrivate::obey_desktop_settings;
}

/*!
  Returns the current state of the modifier keys on the keyboard. The
  current state is updated sychronously as the event queue is emptied
  of events that will spontaneously change the keyboard state
  (QEvent::KeyPress and QEvent::KeyRelease events).

  It should be noted this may not reflect the actual keys held on the
  input device at the time of calling but rather the modifiers as
  last reported in one of the above events. If no keys are being held
  Qt::NoModifier is returned.

  \sa mouseButtons()
*/

Qt::KeyboardModifiers QApplication::keyboardModifiers()
{
    return QApplicationPrivate::modifier_buttons;
}

/*!
  Returns the current state of the buttons on the mouse. The current
  state is updated syncronously as the event queue is emptied of
  events that will spontaneously change the mouse state
  (QEvent::MousePress and QEvent::MouseRelease events).

  It should be noted this may not reflect the actual buttons held on
  theinput device at the time of calling but rather the mouse buttons
  as last reported in one of the above events. If no mouse buttons are
  being held Qt::NoButton is returned.

  \sa keyboardModifiers()
*/

Qt::MouseButtons QApplication::mouseButtons()
{
    return QApplicationPrivate::mouse_buttons;
}

/*!
  \fn bool QApplication::isSessionRestored() const

  Returns true if the application has been restored from an earlier
  \link session.html session\endlink; otherwise returns false.

  \sa sessionId(), commitData(), saveState()
*/


/*!
  \fn QString QApplication::sessionId() const

  Returns the current \link session.html session's\endlink identifier.

  If the application has been restored from an earlier session, this
  identifier is the same as it was in that previous session.

  The session identifier is guaranteed to be unique both for different
  applications and for different instances of the same application.

  \sa isSessionRestored(), sessionKey(), commitData(), saveState()
 */

/*!
  \fn QString QApplication::sessionKey() const

  Returns the session key in the current \link session.html
  session\endlink.

  If the application has been restored from an earlier session, this
  key is the same as it was when the previous session ended.

  The session key changes with every call of commitData() or
  saveState().

  \sa isSessionRestored(), sessionId(), commitData(), saveState()
 */
#ifndef QT_NO_SESSIONMANAGER
bool QApplication::isSessionRestored() const
{
    Q_D(const QApplication);
    return d->is_session_restored;
}

QString QApplication::sessionId() const
{
    Q_D(const QApplication);
    return d->session_id;
}

QString QApplication::sessionKey() const
{
    Q_D(const QApplication);
    return d->session_key;
}
#endif



/*!
  This function deals with \link session.html session
  management\endlink. It is invoked when the QSessionManager wants the
  application to commit all its data.

  Usually this means saving all open files, after getting
  permission from the user. Furthermore you may want to provide a means
  by which the user can cancel the shutdown.

  Note that you should not exit the application within this function.
  Instead, the session manager may or may not do this afterwards,
  depending on the context.

  \warning Within this function, no user interaction is possible, \e
  unless you ask the session manager \a manager for explicit permission.
  See QSessionManager::allowsInteraction() and
  QSessionManager::allowsErrorInteraction() for details and example
  usage.

  The default implementation requests interaction and sends a close
  event to all visible top-level widgets. If any event was
  rejected, the shutdown is canceled.

  \sa isSessionRestored(), sessionId(), saveState(), {Session Management}
*/
#ifndef QT_NO_SESSIONMANAGER
void QApplication::commitData(QSessionManager& manager )
{

    if (manager.allowsInteraction()) {
        QWidgetList done;
        QWidgetList list = QApplication::topLevelWidgets();
        bool cancelled = false;
        for (int i = 0; !cancelled && i < list.size(); ++i) {
            QWidget* w = list.at(i);
            if (w->isVisible() && !done.contains(w)) {
                cancelled = !w->close();
                if (!cancelled)
                    done.append(w);
                list = QApplication::topLevelWidgets();
                i = -1;
            }
        }
        if (cancelled)
            manager.cancel();
    }
}


/*!
  This function deals with \link session.html session
  management\endlink. It is invoked when the
  \link QSessionManager session manager \endlink wants the application
  to preserve its state for a future session.

  For example, a text editor would create a temporary file that
  includes the current contents of its edit buffers, the location of
  the cursor and other aspects of the current editing session.

  Note that you should never exit the application within this
  function. Instead, the session manager may or may not do this
  afterwards, depending on the context. Futhermore, most session
  managers will very likely request a saved state immediately after
  the application has been started. This permits the session manager
  to learn about the application's restart policy.

  \warning Within this function, no user interaction is possible, \e
  unless you ask the session manager \a manager for explicit permission.
  See QSessionManager::allowsInteraction() and
  QSessionManager::allowsErrorInteraction() for details.

  \sa isSessionRestored(), sessionId(), commitData(), {Session Management}
*/

void QApplication::saveState(QSessionManager& /* manager */)
{
}
#endif //QT_NO_SESSIONMANAGER
/*
  Sets the time after which a drag should start to \a ms ms.

  \sa startDragTime()
*/

void QApplication::setStartDragTime(int ms)
{
    drag_time = ms;
}

/*!
    \property QApplication::startDragTime
    \brief the time in milliseconds that a mouse button must be held down
    before a drag and drop operation will begin

    If you support drag and drop in your application, and want to start a
    drag and drop operation after the user has held down a mouse button for
    a certain amount of time, you should use this property's value as the
    delay.

    Qt also uses this delay internally, e.g. in QTextEdit and QLineEdit,
    for starting a drag.

    The default value is 500 ms.

    \sa startDragDistance(), {Drag and Drop}
*/

int QApplication::startDragTime()
{
    return drag_time;
}

/*
  Sets the distance after which a drag should start to \a l pixels.

  \sa startDragDistance()
*/

void QApplication::setStartDragDistance(int l)
{
    drag_distance = l;
}

/*!
    \property QApplication::startDragDistance

    If you support drag and drop in your application, and want to start a
    drag and drop operation after the user has moved the cursor a certain
    distance with a button held down, you should use this property's value
    as the minimum distance required.

    For example, if the mouse position of the click is stored in \c
    startPos and the current position (e.g. in the mouse move event) is
    \c currentPos, you can find out if a drag should be started with code
    like this:

    \code
        if ((startPos - currentPos).manhattanLength() >=
                QApplication::startDragDistance())
            startTheDrag();
    \endcode

    Qt uses this value internally, e.g. in QFileDialog.

    The default value is 4 pixels.

    \sa startDragTime() QPoint::manhattanLength() {Drag and Drop}
*/

int QApplication::startDragDistance()
{
    return drag_distance;
}

/*!
    \fn void QApplication::setReverseLayout(bool reverse)

    Use setLayoutDirection() instead.
*/

/*!
    \fn void QApplication::reverseLayout()

    Use layoutDirection() instead.
*/

/*!
    \fn bool QApplication::isRightToLeft()

    Returns true if the application's layout direction is
    Qt::RightToLeft; otherwise returns false.

    \sa layoutDirection(), isLeftToRight()
*/

/*!
    \fn bool QApplication::isLeftToRight()

    Returns true if the application's layout direction is
    Qt::LeftToRight; otherwise returns false.

    \sa layoutDirection(), isRightToLeft()
*/

/*! \property QApplication::layoutDirection

   \brief the default layout direction for this application

   On system start-up, the default layout direction depends on the
   application's language.

   \sa QWidget::layoutDirection, isLeftToRight(), isRightToLeft()
 */

void QApplication::setLayoutDirection(Qt::LayoutDirection direction)
{
    if (layout_direction == direction)
        return;

    layout_direction = direction;

    QWidgetList list = topLevelWidgets();
    for (int i = 0; i < list.size(); ++i) {
        QWidget *w = list.at(i);
        QEvent ev(QEvent::ApplicationLayoutDirectionChange);
        sendEvent(w, &ev);
    }
}

Qt::LayoutDirection QApplication::layoutDirection()
{
    return layout_direction;
}


/*! \obsolete

  Strips out vertical alignment flags and transforms an
  alignment \a align of Qt::AlignLeft into Qt::AlignLeft or
  Qt::AlignRight according to the language used.
*/

#ifdef QT3_SUPPORT
Qt::Alignment QApplication::horizontalAlignment(Qt::Alignment align)
{
    return QStyle::visualAlignment(layoutDirection(), align);
}
#endif


/*!
    \fn QCursor *QApplication::overrideCursor()

    Returns the active application override cursor.

    This function returns 0 if no application cursor has been defined
    (i.e. the internal cursor stack is empty).

    \sa setOverrideCursor(), restoreOverrideCursor()
*/
#ifndef QT_NO_CURSOR
QCursor *QApplication::overrideCursor()
{
    return qApp->d_func()->cursor_list.isEmpty() ? 0 : &qApp->d_func()->cursor_list.first();
}

/*!
    Changes the currently active application override cursor to \a cursor.

    This function has no effect if setOverrideCursor() wasn't called.

    \sa setOverrideCursor() overrideCursor() restoreOverrideCursor() QWidget::setCursor()
 */
void QApplication::changeOverrideCursor(const QCursor &cursor)
{
    if (qApp->d_func()->cursor_list.isEmpty())
        return;
    qApp->d_func()->cursor_list.removeFirst();
    setOverrideCursor(cursor);
}
#endif

/*!
    \fn void QApplication::setOverrideCursor(const QCursor &cursor, bool replace)

    Use changeOverrideCursor(\a cursor) (if \a replace is true)
    or setOverrideCursor(\a cursor) (if \a replace is false).
*/

/*!
    Enters the main event loop and waits until exit() is called or the
    main widget is destroyed, and returns the value that was set to
    exit() (which is 0 if exit() is called via quit()).

    It is necessary to call this function to start event handling. The
    main event loop receives events from the window system and
    dispatches these to the application widgets.

    Generally speaking, no user interaction can take place before
    calling exec(). As a special case, modal widgets like QMessageBox
    can be used before calling exec(), because modal widgets call
    exec() to start a local event loop.

    To make your application perform idle processing, i.e. executing a
    special function whenever there are no pending events, use a
    QTimer with 0 timeout. More advanced idle processing schemes can
    be achieved using processEvents().

    \sa quitOnLastWindowClosed, quit(), exit(), processEvents(),
        QCoreApplication::exec()
*/
int QApplication::exec()
{
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::setRootObject(qApp);
#endif
    return QCoreApplication::exec();
}

/*! \reimp
 */
bool QApplication::notify(QObject *receiver, QEvent *e)
{
    Q_D(QApplication);
    // no events are delivered after ~QCoreApplication() has started
    if (QApplicationPrivate::is_app_closing)
        return true;

    if (receiver == 0) {                        // serious error
        qWarning("QApplication::notify: Unexpected null receiver");
        return true;
    }

    d->checkReceiverThread(receiver);

#ifdef QT3_SUPPORT
    if (e->type() == QEvent::ChildRemoved && receiver->d_func()->postedChildInsertedEvents)
        d->removePostedChildInsertedEvents(receiver, static_cast<QChildEvent *>(e)->child());
#endif // QT3_SUPPORT

    // capture the current mouse/keyboard state
    if(e->spontaneous()) {
        if(e->type() == QEvent::KeyPress || e->type() == QEvent::KeyRelease) {
            Qt::KeyboardModifier modif = Qt::NoModifier;
            switch(static_cast<QKeyEvent*>(e)->key()) {
            case Qt::Key_Shift:
                modif = Qt::ShiftModifier;
                break;
            case Qt::Key_Control:
                modif = Qt::ControlModifier;
                break;
            case Qt::Key_Meta:
                modif = Qt::MetaModifier;
                break;
            case Qt::Key_Alt:
                modif = Qt::AltModifier;
                break;
            case Qt::Key_NumLock:
                modif = Qt::KeypadModifier;
                break;
            default:
                break;
            }
            if(modif != Qt::NoModifier) {
                if(e->type() == QEvent::KeyPress)
                    QApplicationPrivate::modifier_buttons |= modif;
                else
                    QApplicationPrivate::modifier_buttons &= ~modif;
            }
        } else if(e->type() == QEvent::MouseButtonPress
                  || e->type() == QEvent::MouseButtonRelease) {
            QMouseEvent *me = static_cast<QMouseEvent*>(e);
            if(me->type() == QEvent::MouseButtonPress)
                QApplicationPrivate::mouse_buttons |= me->button();
            else
                QApplicationPrivate::mouse_buttons &= ~me->button();
        }
    }

    // User input and window activation makes tooltips sleep
    switch (e->type()) {
    case QEvent::ActivationChange:
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
    case QEvent::FocusOut:
    case QEvent::FocusIn:
        d->toolTipWakeUp.stop();
        d->toolTipFallAsleep.stop();
        break;
    default:
        break;
    }

    bool res = false;
    if (!receiver->isWidgetType()) {
        res = d->notify_helper(receiver, e);
    } else switch (e->type()) {
#if defined QT3_SUPPORT && !defined(QT_NO_SHORTCUT)
    case QEvent::Accel:
        {
            if (d->use_compat()) {
                QKeyEvent* key = static_cast<QKeyEvent*>(e);
                res = d->notify_helper(receiver, e);

                if (!res && !key->isAccepted())
                    res = d->qt_dispatchAccelEvent(static_cast<QWidget *>(receiver), key);

                // next lines are for compatibility with Qt <= 3.0.x: old
                // QAccel was listening on toplevel widgets
                if (!res && !key->isAccepted() && !static_cast<QWidget *>(receiver)->isWindow())
                    res = d->notify_helper(static_cast<QWidget *>(receiver)->window(), e);
            }
            break;
        }
#endif //QT3_SUPPORT && !QT_NO_SHORTCUT
    case QEvent::ShortcutOverride:
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
        {
            QWidget* w = static_cast<QWidget*>(receiver);
            QKeyEvent* key = static_cast<QKeyEvent*>(e);
#if defined QT3_SUPPORT && !defined(QT_NO_SHORTCUT)
            if (d->use_compat() && d->qt_tryComposeUnicode(w, key))
                break;
#endif
            if (key->type()==QEvent::KeyPress) {
#ifndef QT_NO_SHORTCUT
                // Try looking for a Shortcut before sending key events
                if (res = qApp->d_func()->shortcutMap.tryShortcutEvent(w, key))
                    return res;
#endif
                qt_in_tab_key_event = (key->key() == Qt::Key_Backtab
                                       || key->key() == Qt::Key_Tab
                                       || key->key() == Qt::Key_Left
                                       || key->key() == Qt::Key_Up
                                       || key->key() == Qt::Key_Right
                                       || key->key() == Qt::Key_Down);
            }
            bool def = key->isAccepted();
            while (w) {
                if (def)
                    key->accept();
                else
                    key->ignore();
                res = d->notify_helper(w, e);
                if ((res && key->isAccepted()) || w->isWindow() || !w->parentWidget())
                    break;
                w = w->parentWidget();
            }
            qt_in_tab_key_event = false;
        }
        break;
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::MouseMove:
        {
            QWidget* w = static_cast<QWidget *>(receiver);
            QMouseEvent* mouse = static_cast<QMouseEvent*>(e);
            QPoint relpos = mouse->pos();

            if (e->spontaneous()) {

                if (e->type() == QEvent::MouseButtonPress) {
                    QWidget *fw = w;
                    while (fw) {
                        if (fw->isEnabled() && (fw->focusPolicy() & Qt::ClickFocus)) {
                            fw->setFocus(Qt::MouseFocusReason);
                            break;
                        }
                        if (fw->isWindow())
                            break;
                        fw = fw->parentWidget();
                    }
                }

                if (e->type() == QEvent::MouseMove) {
                    d->toolTipWidget = w;
                    d->toolTipPos = relpos;
                    d->toolTipGlobalPos = mouse->globalPos();
                    d->toolTipWakeUp.start(d->toolTipFallAsleep.isActive()?20:700, this);
                }
            }

            bool eventAccepted = mouse->isAccepted();
            while (w) {
                QMouseEvent me(mouse->type(), relpos, mouse->globalPos(), mouse->button(), mouse->buttons(),
                               mouse->modifiers());
                me.spont = mouse->spontaneous();
                // throw away any mouse-tracking-only mouse events
                if (!w->hasMouseTracking()
                    && mouse->type() == QEvent::MouseMove && mouse->buttons() == 0) {
                    // but still send them through all application event filters (normally done by notify_helper)
                    for (int i = 0; i < d->eventFilters.size(); ++i) {
                        register QObject *obj = d->eventFilters.at(i);
                        if (obj && obj->eventFilter(w, w == receiver ? mouse : &me))
                            break;
                    }
                    res = true;
                } else {
                    w->setAttribute(Qt::WA_NoMouseReplay, false);
                    res = d->notify_helper(w, w == receiver ? mouse : &me);
                    e->spont = false;
                }
                eventAccepted = (w == receiver ? mouse : &me)->isAccepted();
                if (res && eventAccepted)
                    break;
                if (w->isWindow() || w->testAttribute(Qt::WA_NoMousePropagation))
                    break;
                relpos += w->pos();
                w = w->parentWidget();
            }
            mouse->setAccepted(eventAccepted);

            if (e->type() == QEvent::MouseMove) {
                w = static_cast<QWidget *>(receiver);
                relpos = mouse->pos();
                QPoint diff = relpos - w->mapFromGlobal(d->hoverGlobalPos);
                while (w) {
                    if (w->testAttribute(Qt::WA_Hover)) {
                        QHoverEvent he(QEvent::HoverMove, relpos, relpos - diff);
                        d->notify_helper(w, &he);
                    }
                    if (w->isWindow() || w->testAttribute(Qt::WA_NoMousePropagation))
                        break;
                    relpos += w->pos();
                    w = w->parentWidget();
                }
            }
            d->hoverGlobalPos = mouse->globalPos();
        }
        break;
#ifndef QT_NO_WHEELEVENT
    case QEvent::Wheel:
        {
            QWidget* w = static_cast<QWidget *>(receiver);
            QWheelEvent* wheel = static_cast<QWheelEvent*>(e);
            QPoint relpos = wheel->pos();
            bool eventAccepted = wheel->isAccepted();

            if (e->spontaneous()) {
                QWidget *fw = w;
                while (fw) {
                    if (fw->isEnabled() && (fw->focusPolicy() & Qt::WheelFocus) == Qt::WheelFocus) {
                        fw->setFocus(Qt::MouseFocusReason);
                        break;
                    }
                    if (fw->isWindow())
                        break;
                    fw = fw->parentWidget();
                }
            }

            while (w) {
                QWheelEvent we(relpos, wheel->globalPos(), wheel->delta(), wheel->buttons(),
                               wheel->modifiers(), wheel->orientation());
                we.spont = wheel->spontaneous();
                res = d->notify_helper(w, w == receiver ? wheel : &we);
                eventAccepted = ((w == receiver) ? wheel : &we)->isAccepted();
                e->spont = false;
                if ((res && eventAccepted)
                    || w->isWindow() || w->testAttribute(Qt::WA_NoMousePropagation))
                    break;

                relpos += w->pos();
                w = w->parentWidget();
            }
            wheel->setAccepted(eventAccepted);
        }
        break;
#endif
    case QEvent::ContextMenu:
        {
            QWidget* w = static_cast<QWidget *>(receiver);
            QContextMenuEvent *context = static_cast<QContextMenuEvent*>(e);
            QPoint relpos = context->pos();
            bool eventAccepted = context->isAccepted();
            while (w) {
                QContextMenuEvent ce(context->reason(), relpos, context->globalPos());
                ce.spont = e->spontaneous();
                res = d->notify_helper(w, w == receiver ? context : &ce);
                eventAccepted = ((w == receiver) ? context : &ce)->isAccepted();
                e->spont = false;

                if ((res && eventAccepted)
                    || w->isWindow() || w->testAttribute(Qt::WA_NoMousePropagation))
                    break;

                relpos += w->pos();
                w = w->parentWidget();
            }
            context->setAccepted(eventAccepted);
        }
        break;
    case QEvent::TabletMove:
    case QEvent::TabletPress:
    case QEvent::TabletRelease:
        {
            QWidget *w = static_cast<QWidget *>(receiver);
            QTabletEvent *tablet = static_cast<QTabletEvent*>(e);
            QPoint relpos = tablet->pos();
            bool eventAccepted = tablet->isAccepted();
            while (w) {
                QTabletEvent te(tablet->type(), tablet->pos(), tablet->globalPos(),
                                tablet->hiResGlobalPos(), tablet->device(), tablet->pointerType(),
                                tablet->pressure(), tablet->xTilt(), tablet->yTilt(),
                                tablet->tangentialPressure(), tablet->rotation(), tablet->z(),
                                tablet->modifiers(), tablet->uniqueId());
                te.spont = e->spontaneous();
                res = d->notify_helper(w, w == receiver ? tablet : &te);
                eventAccepted = ((w == receiver) ? tablet : &te)->isAccepted();
                e->spont = false;
                if ((res && eventAccepted)
                     || w->isWindow()
                     || w->testAttribute(Qt::WA_NoMousePropagation))
                    break;

                relpos += w->pos();
                w = w->parentWidget();
            }
            tablet->setAccepted(eventAccepted);
            qt_tabletChokeMouse = tablet->isAccepted();
        }
        break;

    case QEvent::ToolTip:
    case QEvent::WhatsThis:
    case QEvent::QueryWhatsThis:
        {
            QWidget* w = static_cast<QWidget *>(receiver);
            QHelpEvent *help = static_cast<QHelpEvent*>(e);
            QPoint relpos = help->pos();
            bool eventAccepted = help->isAccepted();
            while (w) {
                QHelpEvent he(help->type(), relpos, help->globalPos());
                he.spont = e->spontaneous();
                res = d->notify_helper(w, w == receiver ? help : &he);
                e->spont = false;
                eventAccepted = (w == receiver ? help : &he)->isAccepted();
                if ((res && eventAccepted) || w->isWindow())
                    break;

                relpos += w->pos();
                w = w->parentWidget();
            }
            help->setAccepted(eventAccepted);
        }
        break;

    case QEvent::StatusTip:
    case QEvent::WhatsThisClicked:
        {
            QWidget *w = static_cast<QWidget *>(receiver);
            while (w) {
                res = d->notify_helper(w, e);
                if ((res && e->isAccepted()) || w->isWindow())
                    break;
                w = w->parentWidget();
            }
        }
        break;

#ifndef QT_NO_DRAGANDDROP
    case QEvent::DragEnter: {
            QWidget* w = static_cast<QWidget *>(receiver);
            QDragEnterEvent *dragEvent = static_cast<QDragEnterEvent *>(e);
#ifdef Q_WS_MAC
            // HIView has a slight difference in how it delivers events to children and parents
            // It will not give a leave to a child's parent when it enters a child.
            QWidget *currentTarget = QDragManager::self()->currentTarget();
            if (currentTarget) {
                // Assume currentTarget did not get a leave
                QDragLeaveEvent event;
                QApplication::sendEvent(currentTarget, &event);
            }
#endif
            while (w) {
                if (w->isEnabled() && w->acceptDrops()) {
                    res = d->notify_helper(w, dragEvent);
                    if (res && dragEvent->isAccepted()) {
                        if (dragEvent->dropAction() != Qt::IgnoreAction)
                            QDragManager::self()->setCurrentTarget(w);
                        break;
                    }
                }
                if (w->isWindow())
                    break;
                dragEvent->p = w->mapToParent(dragEvent->p);
                w = w->parentWidget();
            }
        }
        break;
    case QEvent::DragMove:
    case QEvent::Drop:
    case QEvent::DragLeave: {
            QWidget * w = QDragManager::self()->currentTarget();
            if (!w) {
#ifdef Q_WS_MAC
                // HIView has a slight difference in how it delivers events to children and parents
                // It will not give an enter to a child's parent when it leaves the child.
                if (e->type() == QEvent::DragLeave)
                    break;
                // Assume that w did not get an enter.
                QDropEvent *dropEvent = static_cast<QDropEvent *>(e);
                QDragEnterEvent dragEnterEvent(dropEvent->pos(), dropEvent->possibleActions(),
                                               dropEvent->mimeData(), dropEvent->mouseButtons(),
                                               dropEvent->keyboardModifiers());
                QApplication::sendEvent(receiver, &dragEnterEvent);
                w = QDragManager::self()->currentTarget();
                if (!w)
#endif
                    break;
            }
            if (e->type() == QEvent::DragMove || e->type() == QEvent::Drop) {
                QDropEvent *dragEvent = static_cast<QDropEvent *>(e);
                QWidget *origReciver = static_cast<QWidget *>(receiver);
                while (origReciver && w != origReciver) {
                    dragEvent->p = origReciver->mapToParent(dragEvent->p);
                    origReciver = origReciver->parentWidget();
                }
            }
            res = d->notify_helper(w, e);
            if (e->type() != QEvent::DragMove)
                QDragManager::self()->setCurrentTarget(0, e->type() == QEvent::Drop);
        }
        break;
#endif

    default:
        res = d->notify_helper(receiver, e);
        break;
    }

    return res;
}

bool QApplicationPrivate::notify_helper(QObject *receiver, QEvent * e)
{
    Q_Q(QApplication);
    // send to all application event filters
    for (int i = 0; i < eventFilters.size(); ++i) {
        register QObject *obj = eventFilters.at(i);
        if (obj && obj->eventFilter(receiver,e))
            return true;
    }

    if (receiver->isWidgetType()) {
        QWidget *widget = static_cast<QWidget *>(receiver);

        // toggle HasMouse widget state on enter and leave
        if (e->type() == QEvent::Enter || e->type() == QEvent::DragEnter)
            widget->setAttribute(Qt::WA_UnderMouse, true);
        else if (e->type() == QEvent::Leave || e->type() == QEvent::DragLeave)
            widget->setAttribute(Qt::WA_UnderMouse, false);

        if (QLayout *layout=widget->d_func()->layout) {
            layout->widgetEvent(e);
        }
    }

    // send to all receiver event filters
    if (receiver != q) {
        for (int i = 0; i < receiver->d_func()->eventFilters.size(); ++i) {
            register QObject *obj = receiver->d_func()->eventFilters.at(i);
            if (obj && obj->eventFilter(receiver,e))
                return true;
        }
    }
    bool consumed = receiver->event(e);
    e->spont = false;
    return consumed;
}


/*!
  \class QSessionManager
  \brief The QSessionManager class provides access to the session manager.

  \ingroup application
  \ingroup environment

  The session manager is responsible for session management, most
  importantly for interruption and resumption. A "session" is a kind
  of record of the state of the system, e.g. which applications were
  run at start up and which applications are currently running. The
  session manager is used to save the session, e.g. when the machine
  is shut down; and to restore a session, e.g. when the machine is
  started up. Use QSettings to save and restore an individual
  application's settings, e.g. window positions, recently used files,
  etc.

  QSessionManager provides an interface between the application and
  the session manager so that the program can work well with the
  session manager. In Qt, session management requests for action
  are handled by the two virtual functions QApplication::commitData()
  and QApplication::saveState(). Both provide a reference to
  a session manager object as argument, to allow the application
  to communicate with the session manager.

  During a session management action (i.e. within commitData() and
  saveState()), no user interaction is possible \e unless the
  application got explicit permission from the session manager. You
  ask for permission by calling allowsInteraction() or, if it's really
  urgent, allowsErrorInteraction(). Qt does not enforce this, but the
  session manager may.

  You can try to abort the shutdown process by calling cancel(). The
  default commitData() function does this if some top-level window
  rejected its closeEvent().

  For sophisticated session managers provided on Unix/X11, QSessionManager
  offers further possibilites to fine-tune an application's session
  management behavior: setRestartCommand(), setDiscardCommand(),
  setRestartHint(), setProperty(), requestPhase2(). See the respective
  function descriptions for further details.
*/

/*! \enum QSessionManager::RestartHint

  This enum type defines the circumstances under which this
  application wants to be restarted by the session manager. The
  current values are

  \value RestartIfRunning  if the application is still running when
  the session is shut down, it wants to be restarted at the start of
  the next session.

  \value RestartAnyway  the application wants to be started at the
  start of the next session, no matter what. (This is useful for
  utilities that run just after startup and then quit.)

  \value RestartImmediately  the application wants to be started
  immediately whenever it is not running.

  \value RestartNever  the application does not want to be restarted
  automatically.

  The default hint is \c RestartIfRunning.
*/


/*!
  \fn QString QSessionManager::sessionId() const

  Returns the identifier of the current session.

  If the application has been restored from an earlier session, this
  identifier is the same as it was in that earlier session.

  \sa sessionKey(), QApplication::sessionId()
 */

/*!
  \fn QString QSessionManager::sessionKey() const

  Returns the session key in the current session.

  If the application has been restored from an earlier session, this
  key is the same as it was when the previous session ended.

  The session key changes with every call of commitData() or
  saveState().

  \sa sessionId(), QApplication::sessionKey()
 */

/*!
    \fn void* QSessionManager::handle() const

    \internal
*/

/*!
  \fn bool QSessionManager::allowsInteraction()

  Asks the session manager for permission to interact with the
  user. Returns true if interaction is permitted; otherwise
  returns false.

  The rationale behind this mechanism is to make it possible to
  synchronize user interaction during a shutdown. Advanced session
  managers may ask all applications simultaneously to commit their
  data, resulting in a much faster shutdown.

  When the interaction is completed we strongly recommend releasing the
  user interaction semaphore with a call to release(). This way, other
  applications may get the chance to interact with the user while your
  application is still busy saving data. (The semaphore is implicitly
  released when the application exits.)

  If the user decides to cancel the shutdown process during the
  interaction phase, you must tell the session manager that this has
  happened by calling cancel().

  Here's an example of how an application's QApplication::commitData()
  might be implemented:

    \code
        void MyApplication::commitData(QSessionManager& manager)
        {
            if (manager.allowsInteraction()) {
                int ret = QMessageBox::warning(
                            mainWindow,
                            tr("My Application"),
                            tr("Save changes to document?"),
                            QMessageBox::Yes | QMessageBox::Default,
                            QMessageBox::No,
                            QMessageBox::Cancel | QMessageBox::Escape);

                switch (ret) {
                case QMessageBox::Yes:
                    manager.release();
                    if (!saveDocument())
                        manager.cancel();
                    break;
                case QMessageBox::No:
                    break;
                case QMessageBox::Cancel:
                default:
                    manager.cancel();
                }
            } else {
                // we did not get permission to interact, then
                // do something reasonable instead
            }
        }
    \endcode

    If an error occurred within the application while saving its data,
    you may want to try allowsErrorInteraction() instead.

    \sa QApplication::commitData(), release(), cancel()
*/


/*!
  \fn bool QSessionManager::allowsErrorInteraction()

  This is similar to allowsInteraction(), but also tells the session
  manager that an error occurred. Session managers may give error
  interaction request higher priority, which means that it is more likely
  that an error interaction is permitted. However, you are still not
  guaranteed that the session manager will allow interaction.

  \sa allowsInteraction(), release(), cancel()
*/

/*!
  \fn void QSessionManager::release()

  Releases the session manager's interaction semaphore after an
  interaction phase.

  \sa allowsInteraction(), allowsErrorInteraction()
*/

/*!
  \fn void QSessionManager::cancel()

  Tells the session manager to cancel the shutdown process.  Applications
  should not call this function without first asking the user.

  \sa allowsInteraction(), allowsErrorInteraction()

*/

/*!
  \fn void QSessionManager::setRestartHint(RestartHint hint)

  Sets the application's restart hint to \a hint. On application
  startup the hint is set to \c RestartIfRunning.

  Note that these flags are only hints, a session manager may or may
  not respect them.

  We recommend setting the restart hint in QApplication::saveState()
  because most session managers perform a checkpoint shortly after an
  application's startup.

  \sa restartHint()
*/

/*!
  \fn QSessionManager::RestartHint QSessionManager::restartHint() const

  Returns the application's current restart hint. The default is
  \c RestartIfRunning.

  \sa setRestartHint()
*/

/*!
  \fn void QSessionManager::setRestartCommand(const QStringList& command)

  If the session manager is capable of restoring sessions it will
  execute \a command in order to restore the application. The command
  defaults to

    \code
        appname -session id
    \endcode

  The \c -session option is mandatory; otherwise QApplication cannot
  tell whether it has been restored or what the current session
  identifier is. See QApplication::isSessionRestored() and
  QApplication::sessionId() for details.

  If your application is very simple, it may be possible to store the
  entire application state in additional command line options. This
  is usually a very bad idea because command lines are often limited
  to a few hundred bytes. Instead, use QSettings, or temporary files
  or a database for this purpose. By marking the data with the unique
  sessionId(), you will be able to restore the application in a future
  session.

  \sa restartCommand(), setDiscardCommand(), setRestartHint()
*/

/*!
    \fn QStringList QSessionManager::restartCommand() const

    Returns the currently set restart command.

    To iterate over the list, you can use the \l foreach
    pseudo-keyword:

    \code
        foreach (QString command, mySession.restartCommand())
            do_something(command);
    \endcode

    \sa setRestartCommand(), restartHint()
*/

/*!
  \fn void QSessionManager::setDiscardCommand(const QStringList& list)

  Sets the discard command to the given \a list.

  \sa discardCommand(), setRestartCommand()
*/


/*!
    \fn QStringList QSessionManager::discardCommand() const

    Returns the currently set discard command.

    To iterate over the list, you can use the \l foreach
    pseudo-keyword:

    \code
        foreach (QString command, mySession.discardCommand())
            do_something(command);
    \endcode

    \sa setDiscardCommand(), restartCommand(), setRestartCommand()
*/

/*!
  \fn void QSessionManager::setManagerProperty(const QString &name, const QString &value)
  \overload

  Low-level write access to the application's identification and state
  records are kept in the session manager.

  The property called \a name has its value set to the string \a value.
*/

/*!
  \fn void QSessionManager::setManagerProperty(const QString& name,
                                                const QStringList& value)

  Low-level write access to the application's identification and state
  record are kept in the session manager.

  The property called \a name has its value set to the string list \a value.
*/

/*!
  \fn bool QSessionManager::isPhase2() const

  Returns true if the session manager is currently performing a second
  session management phase; otherwise returns false.

  \sa requestPhase2()
*/

/*!
  \fn void QSessionManager::requestPhase2()

  Requests a second session management phase for the application. The
  application may then return immediately from the
  QApplication::commitData() or QApplication::saveState() function,
  and they will be called again once most or all other applications have
  finished their session management.

  The two phases are useful for applications such as the X11 window manager
  that need to store information about another application's windows
  and therefore have to wait until these applications have completed their
  respective session management tasks.

  Note that if another application has requested a second phase it
  may get called before, simultaneously with, or after your
  application's second phase.

  \sa isPhase2()
*/

/*****************************************************************************
  Stubbed session management support
 *****************************************************************************/
#ifndef QT_NO_SESSIONMANAGER
#if defined(Q_WS_WIN) || defined(Q_WS_MAC) || defined(Q_WS_QWS)

class QSessionManagerPrivate : public QObjectPrivate
{
public:
    QStringList restartCommand;
    QStringList discardCommand;
    QString sessionId;
    QString sessionKey;
    QSessionManager::RestartHint restartHint;
};

QSessionManager* qt_session_manager_self = 0;
QSessionManager::QSessionManager(QApplication * app, QString &id, QString &key)
    : QObject(*new QSessionManagerPrivate, app)
{
    Q_D(QSessionManager);
    setObjectName(QLatin1String("qt_sessionmanager"));
    qt_session_manager_self = this;
#if defined(Q_WS_WIN) && !defined(Q_OS_TEMP)
    wchar_t guidstr[40];
    GUID guid;
    CoCreateGuid(&guid);
    StringFromGUID2(guid, guidstr, 40);
    id = QString::fromUtf16((ushort*)guidstr);
    CoCreateGuid(&guid);
    StringFromGUID2(guid, guidstr, 40);
    key = QString::fromUtf16((ushort*)guidstr);
#endif
    d->sessionId = id;
    d->sessionKey = key;
    d->restartHint = RestartIfRunning;
}

QSessionManager::~QSessionManager()
{
    qt_session_manager_self = 0;
}

QString QSessionManager::sessionId() const
{
    Q_D(const QSessionManager);
    return d->sessionId;
}

QString QSessionManager::sessionKey() const
{
    Q_D(const QSessionManager);
    return d->sessionKey;
}


#if defined(Q_WS_X11) || defined(Q_WS_MAC)
void* QSessionManager::handle() const
{
    return 0;
}
#endif

#if !defined(Q_WS_WIN)
bool QSessionManager::allowsInteraction()
{
    return true;
}

bool QSessionManager::allowsErrorInteraction()
{
    return true;
}
void QSessionManager::release()
{
}

void QSessionManager::cancel()
{
}
#endif


void QSessionManager::setRestartHint(QSessionManager::RestartHint hint)
{
    Q_D(QSessionManager);
    d->restartHint = hint;
}

QSessionManager::RestartHint QSessionManager::restartHint() const
{
    Q_D(const QSessionManager);
    return d->restartHint;
}

void QSessionManager::setRestartCommand(const QStringList& command)
{
    Q_D(QSessionManager);
    d->restartCommand = command;
}

QStringList QSessionManager::restartCommand() const
{
    Q_D(const QSessionManager);
    return d->restartCommand;
}

void QSessionManager::setDiscardCommand(const QStringList& command)
{
    Q_D(QSessionManager);
    d->discardCommand = command;
}

QStringList QSessionManager::discardCommand() const
{
    Q_D(const QSessionManager);
    return d->discardCommand;
}

void QSessionManager::setManagerProperty(const QString&, const QString&)
{
}

void QSessionManager::setManagerProperty(const QString&, const QStringList&)
{
}

bool QSessionManager::isPhase2() const
{
    return false;
}

void QSessionManager::requestPhase2()
{
}

#endif
#endif // QT_NO_SESSIONMANAGER

/*!
    \typedef QApplication::ColorMode
    \compat

    Use ColorSpec instead.
*/

/*!
    \fn Qt::MacintoshVersion QApplication::macVersion()

    Use QSysInfo::MacintoshVersion instead.
*/

/*!
    \fn QApplication::ColorMode QApplication::colorMode()

    Use colorSpec() instead, and use ColorSpec as the enum type.
*/

/*!
    \fn void QApplication::setColorMode(ColorMode mode)

    Use setColorSpec() instead, and pass a ColorSpec value instead.
*/

/*!
    \fn bool QApplication::hasGlobalMouseTracking()

    This feature does not exist anymore. This function
    always returns true in Qt 4.
*/

/*!
    \fn void QApplication::setGlobalMouseTracking(bool dummy)

    This function does nothing in Qt 4. The \a dummy parameter
    is ignored.
*/

/*!
    \fn void QApplication::flushX()

    Use flush() instead.
*/

/*!
    \fn void QApplication::setWinStyleHighlightColor(const QColor &c)

    Use the palette instead.

    \oldcode
    app.setWinStyleHighlightColor(color);
    \newcode
    QPalette palette(qApp->palette());
    palette.setColor(QPalette::Highlight, color);
    qApp->setPalette(palette);
    \endcode
*/

/*!
    \fn void QApplication::setPalette(const QPalette &pal, bool b, const char* className = 0)

    Use the two-argument overload instead.
*/

/*!
    \fn void QApplication::setFont(const QFont &font, bool b, const char* className = 0)

    Use the two-argument overload instead.
*/

/*!
    \fn const QColor &QApplication::winStyleHighlightColor()

    Use qApp->palette().color(QPalette::Active, QPalette::Highlight)
    instead.
*/

/*!
    \fn QWidget *QApplication::widgetAt(int x, int y, bool child)

    Use the two-argument widgetAt() overload to get the child widget.
    To get the top-level widget do this:

    \code
        QWidget *widget = qApp->widgetAt(x, y);
        if (widget)
            widget = widget->window();
    \endcode
*/

/*!
    \fn QWidget *QApplication::widgetAt(const QPoint &point, bool child)

    Use the single-argument widgetAt() overload to get the child widget.
    To get the top-level widget do this:

    \code
        QWidget *widget = qApp->widgetAt(point);
        if (widget)
            widget = widget->window();
    \endcode
*/

#ifdef QT3_SUPPORT
QWidget *QApplication::mainWidget()
{
    return QApplicationPrivate::main_widget;
}
#endif
bool QApplicationPrivate::inPopupMode() const
{
    return QApplicationPrivate::popupWidgets != 0;
}

/*!
    \property QApplication::quitOnLastWindowClosed

    \brief whether the application implicitly quits when the last
    window is closed.

    The default is true.

    If this property is true, the applications quits when the last
    visible primary window (i.e. window with no parent) with the
    Qt::WA_QuitOnClose attribute set is closed. By default this
    attribute is set for all widgets except transient windows such as
    splash screens, tool windows, and popup menus.

    \sa quit(), QWidget::close()
 */

void QApplication::setQuitOnLastWindowClosed(bool quit)
{
    QApplicationPrivate::quitOnLastWindowClosed = quit;
}

bool QApplication::quitOnLastWindowClosed()
{
    return QApplicationPrivate::quitOnLastWindowClosed;
}

void QApplicationPrivate::emitLastWindowClosed()
{
    if (qApp && qApp->d_func()->in_exec) {
        if (QApplicationPrivate::quitOnLastWindowClosed)
            qApp->quit();
        emit qApp->lastWindowClosed();
    }
}

/*! \variable QApplication::NormalColors
    \compat

    Use \l NormalColor instead.
*/

/*! \variable QApplication::CustomColors
    \compat

    Use \l CustomColor instead.
*/

#ifdef QT_KEYPAD_NAVIGATION
/*!
    Sets whether Qt should use focus navigation suitable for use with a
    minimal keypad.

    If enabled, Qt::Key_Up and Qt::Key_Down are used to change focus.

    This feature is available in Qtopia Core only.

    \sa keypadNavigationEnabled()
*/
void QApplication::setKeypadNavigationEnabled(bool enable)
{
    QApplicationPrivate::keypadNavigation = enable;
}

/*
    Returns true if Qt is set to use keypad navigation; otherwise returns
    false. The default is false.

    This feature is available in Qtopia Core only.
    \sa setKeypadNavigationEnabled()
*/
bool QApplication::keypadNavigationEnabled()
{
    return QApplicationPrivate::keypadNavigation;
}
#endif

/*!
    \macro qApp
    \relates QApplication

    A global pointer referring to the unique application object. It is
    equivalent to the pointer returned by the
    QCoreApplication::instance() function.

    Only one application object can be created.

    \sa QCoreApplication::instance()
*/

// ************************************************************************
// Input Method support
// ************************************************************************

/*!
    This function replaces the QInputContext instance used by the
    application with \a inputContext.

    \sa inputContext()
*/
void QApplication::setInputContext(QInputContext *inputContext)
{
    Q_D(QApplication);
    if (d->inputContext)
        delete d->inputContext;
    d->inputContext = inputContext;
}

/*!
    Returns the QInputContext instance used by the application.

    \sa setInputContext()
*/
QInputContext *QApplication::inputContext() const
{
    Q_D(const QApplication);
#ifdef Q_WS_X11
    if (!X11)
        return 0;
    if (!d->inputContext) {
        QApplication *that = const_cast<QApplication *>(this);
        that->d_func()->inputContext = QInputContextFactory::create(X11->default_im, that);
    }
#endif
    return d->inputContext;
}

#include "moc_qapplication.cpp"
