/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

// components/formeditor
#include "formwindowmanager.h"
#include "formwindow_dnditem.h"
#include "formwindow.h"
#include "formeditor.h"
#include "widgetselection.h"
#include "previewactiongroup.h"
#include "formwindowsettings.h"

// shared
#include <widgetdatabase_p.h>
#include <iconloader_p.h>
#include <connectionedit_p.h>
#include <qtresourcemodel_p.h>
#include <qdesigner_dnditem_p.h>
#include <qdesigner_command_p.h>
#include <qdesigner_command2_p.h>
#include <layoutinfo_p.h>
#include <qlayout_widget_p.h>
#include <qdesigner_objectinspector_p.h>
#include <actioneditor_p.h>
#include <shared_settings_p.h>
#include <previewmanager_p.h>
#include <abstractdialoggui_p.h>
#include <widgetfactory_p.h>
#include <spacer_widget_p.h>

// SDK
#include <QtDesigner/qextensionmanager.h>
#include <QtDesigner/abstractlanguage.h>
#include <QtDesigner/container.h>
#include <QtDesigner/abstractwidgetbox.h>
#include <QtDesigner/abstractintegration.h>

#include <QtWidgets/qundogroup.h>
#include <QtWidgets/qaction.h>
#include <QtWidgets/qsplitter.h>
#include <QtGui/qevent.h>
#include <QtWidgets/qapplication.h>
#include <QtWidgets/qsizegrip.h>
#if QT_CONFIG(clipboard)
#include <QtGui/qclipboard.h>
#endif
#include <QtWidgets/qmdiarea.h>
#include <QtWidgets/qmdisubwindow.h>
#include <QtWidgets/qdesktopwidget.h>
#include <QtWidgets/qmessagebox.h>

#include <QtCore/qdebug.h>

QT_BEGIN_NAMESPACE

namespace {
    enum { debugFWM = 0 };
}

static inline QString whatsThisFrom(const QString &str) { /// ### implement me!
    return str;
}

// find the first child of w in a sequence
template <class Iterator>
static inline Iterator findFirstChildOf(Iterator it,Iterator end, const QWidget *w)
{
    for  (;it != end; ++it) {
        if (w->isAncestorOf(*it))
            return  it;
    }
    return it;
}

namespace qdesigner_internal {

FormWindowManager::FormWindowManager(QDesignerFormEditorInterface *core, QObject *parent) :
    QDesignerFormWindowManager(parent),
    m_core(core),
    m_activeFormWindow(nullptr),
    m_previewManager(new PreviewManager(PreviewManager::SingleFormNonModalPreview, this)),
    m_createLayoutContext(LayoutContainer),
    m_morphLayoutContainer(nullptr),
    m_actionGroupPreviewInStyle(nullptr),
    m_actionShowFormWindowSettingsDialog(nullptr)
{
    setupActions();
    qApp->installEventFilter(this);
}

FormWindowManager::~FormWindowManager()
{
    qDeleteAll(m_formWindows);
}

QDesignerFormEditorInterface *FormWindowManager::core() const
{
    return m_core;
}

QDesignerFormWindowInterface *FormWindowManager::activeFormWindow() const
{
    return m_activeFormWindow;
}

int FormWindowManager::formWindowCount() const
{
    return m_formWindows.size();
}

QDesignerFormWindowInterface *FormWindowManager::formWindow(int index) const
{
    return m_formWindows.at(index);
}

bool FormWindowManager::eventFilter(QObject *o, QEvent *e)
{
    if (!o->isWidgetType())
        return false;

    // If we don't have an active form, we only listen for WindowActivate to speed up integrations
    const QEvent::Type eventType = e->type();
    if (m_activeFormWindow == nullptr && eventType != QEvent::WindowActivate)
        return false;

    switch (eventType) { // Uninteresting events
    case QEvent::Create:
    case QEvent::Destroy:
    case QEvent::ActionAdded:
    case QEvent::ActionChanged:
    case QEvent::ActionRemoved:
    case QEvent::ChildAdded:
    case QEvent::ChildPolished:
    case QEvent::ChildRemoved:
#if QT_CONFIG(clipboard)
    case QEvent::Clipboard:
#endif
    case QEvent::ContentsRectChange:
    case QEvent::DeferredDelete:
    case QEvent::FileOpen:
    case QEvent::LanguageChange:
    case QEvent::MetaCall:
    case QEvent::ModifiedChange:
    case QEvent::Paint:
    case QEvent::PaletteChange:
    case QEvent::ParentAboutToChange:
    case QEvent::ParentChange:
    case QEvent::Polish:
    case QEvent::PolishRequest:
    case QEvent::QueryWhatsThis:
    case QEvent::StatusTip:
    case QEvent::StyleChange:
    case QEvent::Timer:
    case QEvent::ToolBarChange:
    case QEvent::ToolTip:
    case QEvent::WhatsThis:
    case QEvent::WhatsThisClicked:
    case QEvent::WinIdChange:
    case QEvent::DynamicPropertyChange:
    case QEvent::HoverEnter:
    case QEvent::HoverLeave:
    case QEvent::HoverMove:
    case QEvent::AcceptDropsChange:
        return false;
    default:
        break;
    }

    QWidget *widget = static_cast<QWidget*>(o);

    if (qobject_cast<WidgetHandle*>(widget)) { // ### remove me
        return false;
    }

    FormWindow *fw = FormWindow::findFormWindow(widget);
    if (fw == nullptr) {
        return false;
    }

    if (QWidget *managedWidget = findManagedWidget(fw, widget)) {
        // Prevent MDI subwindows from being closed by clicking at the title bar
        if (managedWidget != widget && eventType == QEvent::Close) {
            e->ignore();
            return true;
        }
        switch (eventType) {
        case QEvent::LayoutRequest:
            // QTBUG-61439: Suppress layout request while changing the QGridLayout
            // span of a QTabWidget, which sends LayoutRequest in resizeEvent().
            if (fw->handleOperation() == FormWindow::ChangeLayoutSpanHandleOperation) {
                e->ignore();
                return true;
            }
            break;

        case QEvent::WindowActivate: {
            if (fw->parentWidget()->isWindow() && fw->isMainContainer(managedWidget) && activeFormWindow() != fw) {
                setActiveFormWindow(fw);
            }
        } break;

        case QEvent::WindowDeactivate: {
            if (o == fw && o == activeFormWindow())
                fw->repaintSelection();
        } break;

        case QEvent::KeyPress: {
            QKeyEvent *ke = static_cast<QKeyEvent*>(e);
            if (ke->key() == Qt::Key_Escape) {
                ke->accept();
                return true;
            }
        }
        Q_FALLTHROUGH(); // don't break...

        // Embedded Design: Drop on different form: Make sure the right form
        // window/device is active before having the widget created by the factory
        case QEvent::Drop:
            if (activeFormWindow() != fw)
                setActiveFormWindow(fw);
            Q_FALLTHROUGH(); // don't break...
        default: {
            if (fw->handleEvent(widget, managedWidget, e)) {
                return true;
            }
        } break;

        } // end switch
    }

    return false;
}

void FormWindowManager::addFormWindow(QDesignerFormWindowInterface *w)
{
    FormWindow *formWindow = qobject_cast<FormWindow*>(w);
    if (!formWindow || m_formWindows.contains(formWindow))
        return;

    connect(formWindow, &QDesignerFormWindowInterface::selectionChanged,
            this, &FormWindowManager::slotUpdateActions);
    connect(formWindow->commandHistory(), &QUndoStack::indexChanged,
            this, &FormWindowManager::slotUpdateActions);
    connect(formWindow, &QDesignerFormWindowInterface::toolChanged,
            this, &FormWindowManager::slotUpdateActions);

    if (ActionEditor *ae = qobject_cast<ActionEditor *>(m_core->actionEditor())) {
        connect(w, &QDesignerFormWindowInterface::mainContainerChanged,
                ae, &ActionEditor::mainContainerChanged);
    }
    if (QDesignerObjectInspector *oi = qobject_cast<QDesignerObjectInspector *>(m_core->objectInspector()))
        connect(w, &QDesignerFormWindowInterface::mainContainerChanged,
                oi, &QDesignerObjectInspector::mainContainerChanged);

    m_formWindows.append(formWindow);
    emit formWindowAdded(formWindow);
}

void FormWindowManager::removeFormWindow(QDesignerFormWindowInterface *w)
{
    FormWindow *formWindow = qobject_cast<FormWindow*>(w);

    int idx = m_formWindows.indexOf(formWindow);
    if (!formWindow || idx == -1)
        return;

    formWindow->disconnect(this);
    m_formWindows.removeAt(idx);
    emit formWindowRemoved(formWindow);

    if (formWindow == m_activeFormWindow)
        setActiveFormWindow(nullptr);

    // Make sure that widget box is enabled by default
    if (m_formWindows.isEmpty() && m_core->widgetBox())
        m_core->widgetBox()->setEnabled(true);

}

void FormWindowManager::setActiveFormWindow(QDesignerFormWindowInterface *w)
{
    FormWindow *formWindow = qobject_cast<FormWindow*>(w);

    if (formWindow == m_activeFormWindow)
        return;

    FormWindow *old = m_activeFormWindow;

    m_activeFormWindow = formWindow;

    QtResourceSet *resourceSet = nullptr;
    if (formWindow)
        resourceSet = formWindow->resourceSet();
    m_core->resourceModel()->setCurrentResourceSet(resourceSet);

    slotUpdateActions();

    if (m_activeFormWindow) {
        m_activeFormWindow->repaintSelection();
        if (old)
            old->repaintSelection();
    }

    emit activeFormWindowChanged(m_activeFormWindow);

    if (m_activeFormWindow) {
        m_activeFormWindow->emitSelectionChanged();
        m_activeFormWindow->commandHistory()->setActive();
        // Trigger setActiveSubWindow on mdi area unless we are in toplevel mode
        QMdiSubWindow *mdiSubWindow = nullptr;
        if (QWidget *formwindow = m_activeFormWindow->parentWidget()) {
            mdiSubWindow = qobject_cast<QMdiSubWindow *>(formwindow->parentWidget());
        }
        if (mdiSubWindow) {
            for (QWidget *parent = mdiSubWindow->parentWidget(); parent; parent = parent->parentWidget()) {
                if (QMdiArea *mdiArea = qobject_cast<QMdiArea*>(parent)) {
                    mdiArea->setActiveSubWindow(mdiSubWindow);
                    break;
                }
            }
        }
    }
}

void FormWindowManager::closeAllPreviews()
{
    m_previewManager->closeAllPreviews();
}

QWidget *FormWindowManager::findManagedWidget(FormWindow *fw, QWidget *w)
{
    while (w && w != fw) {
        if (fw->isManaged(w))
            break;
        w = w->parentWidget();
    }
    return w;
}

void FormWindowManager::setupActions()
{
#if QT_CONFIG(clipboard)
    const QIcon cutIcon = QIcon::fromTheme(QStringLiteral("edit-cut"), createIconSet(QStringLiteral("editcut.png")));
    m_actionCut = new QAction(cutIcon, tr("Cu&t"), this);
    m_actionCut->setObjectName(QStringLiteral("__qt_cut_action"));
    m_actionCut->setShortcut(QKeySequence::Cut);
    m_actionCut->setStatusTip(tr("Cuts the selected widgets and puts them on the clipboard"));
    m_actionCut->setWhatsThis(whatsThisFrom(QStringLiteral("Edit|Cut")));
    connect(m_actionCut, &QAction::triggered, this, &FormWindowManager::slotActionCutActivated);
    m_actionCut->setEnabled(false);

    const QIcon copyIcon = QIcon::fromTheme(QStringLiteral("edit-copy"), createIconSet(QStringLiteral("editcopy.png")));
    m_actionCopy = new QAction(copyIcon, tr("&Copy"), this);
    m_actionCopy->setObjectName(QStringLiteral("__qt_copy_action"));
    m_actionCopy->setShortcut(QKeySequence::Copy);
    m_actionCopy->setStatusTip(tr("Copies the selected widgets to the clipboard"));
    m_actionCopy->setWhatsThis(whatsThisFrom(QStringLiteral("Edit|Copy")));
    connect(m_actionCopy, &QAction::triggered, this, &FormWindowManager::slotActionCopyActivated);
    m_actionCopy->setEnabled(false);

    const QIcon pasteIcon = QIcon::fromTheme(QStringLiteral("edit-paste"), createIconSet(QStringLiteral("editpaste.png")));
    m_actionPaste = new QAction(pasteIcon, tr("&Paste"), this);
    m_actionPaste->setObjectName(QStringLiteral("__qt_paste_action"));
    m_actionPaste->setShortcut(QKeySequence::Paste);
    m_actionPaste->setStatusTip(tr("Pastes the clipboard's contents"));
    m_actionPaste->setWhatsThis(whatsThisFrom(QStringLiteral("Edit|Paste")));
    connect(m_actionPaste, &QAction::triggered, this, &FormWindowManager::slotActionPasteActivated);
    m_actionPaste->setEnabled(false);
#endif

    m_actionDelete = new QAction(QIcon::fromTheme(QStringLiteral("edit-delete")), tr("&Delete"), this);
    m_actionDelete->setObjectName(QStringLiteral("__qt_delete_action"));
    m_actionDelete->setStatusTip(tr("Deletes the selected widgets"));
    m_actionDelete->setWhatsThis(whatsThisFrom(QStringLiteral("Edit|Delete")));
    connect(m_actionDelete, &QAction::triggered, this, &FormWindowManager::slotActionDeleteActivated);
    m_actionDelete->setEnabled(false);

    m_actionSelectAll = new QAction(tr("Select &All"), this);
    m_actionSelectAll->setObjectName(QStringLiteral("__qt_select_all_action"));
    m_actionSelectAll->setShortcut(QKeySequence::SelectAll);
    m_actionSelectAll->setStatusTip(tr("Selects all widgets"));
    m_actionSelectAll->setWhatsThis(whatsThisFrom(QStringLiteral("Edit|Select All")));
    connect(m_actionSelectAll, &QAction::triggered, this, &FormWindowManager::slotActionSelectAllActivated);
    m_actionSelectAll->setEnabled(false);

    m_actionRaise = new QAction(createIconSet(QStringLiteral("editraise.png")), tr("Bring to &Front"), this);
    m_actionRaise->setObjectName(QStringLiteral("__qt_raise_action"));
    m_actionRaise->setShortcut(Qt::CTRL + Qt::Key_L);
    m_actionRaise->setStatusTip(tr("Raises the selected widgets"));
    m_actionRaise->setWhatsThis(tr("Raises the selected widgets"));
    connect(m_actionRaise, &QAction::triggered, this, &FormWindowManager::slotActionRaiseActivated);
    m_actionRaise->setEnabled(false);

    m_actionLower = new QAction(createIconSet(QStringLiteral("editlower.png")), tr("Send to &Back"), this);
    m_actionLower->setObjectName(QStringLiteral("__qt_lower_action"));
    m_actionLower->setShortcut(Qt::CTRL + Qt::Key_K);
    m_actionLower->setStatusTip(tr("Lowers the selected widgets"));
    m_actionLower->setWhatsThis(tr("Lowers the selected widgets"));
    connect(m_actionLower, &QAction::triggered, this, &FormWindowManager::slotActionLowerActivated);
    m_actionLower->setEnabled(false);

    m_actionAdjustSize = new QAction(createIconSet(QStringLiteral("adjustsize.png")), tr("Adjust &Size"), this);
    m_actionAdjustSize->setObjectName(QStringLiteral("__qt_adjust_size_action"));
    m_actionAdjustSize->setShortcut(Qt::CTRL + Qt::Key_J);
    m_actionAdjustSize->setStatusTip(tr("Adjusts the size of the selected widget"));
    m_actionAdjustSize->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Adjust Size")));
    connect(m_actionAdjustSize, &QAction::triggered, this, &FormWindowManager::slotActionAdjustSizeActivated);
    m_actionAdjustSize->setEnabled(false);


    m_actionHorizontalLayout = new QAction(createIconSet(QStringLiteral("edithlayout.png")), tr("Lay Out &Horizontally"), this);
    m_actionHorizontalLayout->setObjectName(QStringLiteral("__qt_horizontal_layout_action"));
    m_actionHorizontalLayout->setShortcut(Qt::CTRL + Qt::Key_1);
    m_actionHorizontalLayout->setStatusTip(tr("Lays out the selected widgets horizontally"));
    m_actionHorizontalLayout->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Lay Out Horizontally")));
    m_actionHorizontalLayout->setData(LayoutInfo::HBox);
    m_actionHorizontalLayout->setEnabled(false);
    connect(m_actionHorizontalLayout, &QAction::triggered, this, &FormWindowManager::createLayout);

    m_actionVerticalLayout = new QAction(createIconSet(QStringLiteral("editvlayout.png")), tr("Lay Out &Vertically"), this);
    m_actionVerticalLayout->setObjectName(QStringLiteral("__qt_vertical_layout_action"));
    m_actionVerticalLayout->setShortcut(Qt::CTRL + Qt::Key_2);
    m_actionVerticalLayout->setStatusTip(tr("Lays out the selected widgets vertically"));
    m_actionVerticalLayout->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Lay Out Vertically")));
    m_actionVerticalLayout->setData(LayoutInfo::VBox);
    m_actionVerticalLayout->setEnabled(false);
    connect(m_actionVerticalLayout, &QAction::triggered, this, &FormWindowManager::createLayout);

    QIcon formIcon = QIcon::fromTheme(QStringLiteral("designer-form-layout"), createIconSet(QStringLiteral("editform.png")));
    m_actionFormLayout = new QAction(formIcon, tr("Lay Out in a &Form Layout"), this);
    m_actionFormLayout->setObjectName(QStringLiteral("__qt_form_layout_action"));
    m_actionFormLayout->setShortcut(Qt::CTRL + Qt::Key_6);
    m_actionFormLayout->setStatusTip(tr("Lays out the selected widgets in a form layout"));
    m_actionFormLayout->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Lay Out in a Form")));
    m_actionFormLayout->setData(LayoutInfo::Form);
    m_actionFormLayout->setEnabled(false);
    connect(m_actionFormLayout, &QAction::triggered, this, &FormWindowManager::createLayout);

    m_actionGridLayout = new QAction(createIconSet(QStringLiteral("editgrid.png")), tr("Lay Out in a &Grid"), this);
    m_actionGridLayout->setObjectName(QStringLiteral("__qt_grid_layout_action"));
    m_actionGridLayout->setShortcut(Qt::CTRL + Qt::Key_5);
    m_actionGridLayout->setStatusTip(tr("Lays out the selected widgets in a grid"));
    m_actionGridLayout->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Lay Out in a Grid")));
    m_actionGridLayout->setData(LayoutInfo::Grid);
    m_actionGridLayout->setEnabled(false);
    connect(m_actionGridLayout, &QAction::triggered, this, &FormWindowManager::createLayout);

    m_actionSplitHorizontal = new QAction(createIconSet(QStringLiteral("edithlayoutsplit.png")),
                                          tr("Lay Out Horizontally in S&plitter"), this);
    m_actionSplitHorizontal->setObjectName(QStringLiteral("__qt_split_horizontal_action"));
    m_actionSplitHorizontal->setShortcut(Qt::CTRL + Qt::Key_3);
    m_actionSplitHorizontal->setStatusTip(tr("Lays out the selected widgets horizontally in a splitter"));
    m_actionSplitHorizontal->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Lay Out Horizontally in Splitter")));
    m_actionSplitHorizontal->setData(LayoutInfo::HSplitter);
    m_actionSplitHorizontal->setEnabled(false);
    connect(m_actionSplitHorizontal, &QAction::triggered, this, &FormWindowManager::createLayout);

    m_actionSplitVertical = new QAction(createIconSet(QStringLiteral("editvlayoutsplit.png")),
                                        tr("Lay Out Vertically in Sp&litter"), this);
    m_actionSplitVertical->setObjectName(QStringLiteral("__qt_split_vertical_action"));
    m_actionSplitVertical->setShortcut(Qt::CTRL + Qt::Key_4);
    m_actionSplitVertical->setStatusTip(tr("Lays out the selected widgets vertically in a splitter"));
    m_actionSplitVertical->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Lay Out Vertically in Splitter")));
    connect(m_actionSplitVertical, &QAction::triggered, this, &FormWindowManager::createLayout);
    m_actionSplitVertical->setData(LayoutInfo::VSplitter);

    m_actionSplitVertical->setEnabled(false);

    m_actionBreakLayout = new QAction(createIconSet(QStringLiteral("editbreaklayout.png")), tr("&Break Layout"), this);
    m_actionBreakLayout->setObjectName(QStringLiteral("__qt_break_layout_action"));
    m_actionBreakLayout->setShortcut(Qt::CTRL + Qt::Key_0);
    m_actionBreakLayout->setStatusTip(tr("Breaks the selected layout"));
    m_actionBreakLayout->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Break Layout")));
    connect(m_actionBreakLayout, &QAction::triggered, this, &FormWindowManager::slotActionBreakLayoutActivated);
    m_actionBreakLayout->setEnabled(false);

    m_actionSimplifyLayout = new QAction(tr("Si&mplify Grid Layout"), this);
    m_actionSimplifyLayout->setObjectName(QStringLiteral("__qt_simplify_layout_action"));
    m_actionSimplifyLayout->setStatusTip(tr("Removes empty columns and rows"));
    m_actionSimplifyLayout->setWhatsThis(whatsThisFrom(QStringLiteral("Layout|Simplify Layout")));
    connect(m_actionSimplifyLayout, &QAction::triggered, this, &FormWindowManager::slotActionSimplifyLayoutActivated);
    m_actionSimplifyLayout->setEnabled(false);

    m_actionDefaultPreview = new QAction(tr("&Preview..."), this);
    m_actionDefaultPreview->setObjectName(QStringLiteral("__qt_default_preview_action"));
    m_actionDefaultPreview->setStatusTip(tr("Preview current form"));
    m_actionDefaultPreview->setWhatsThis(whatsThisFrom(QStringLiteral("Form|Preview")));
    connect(m_actionDefaultPreview, &QAction::triggered,
            this, &FormWindowManager::showPreview);

    m_undoGroup = new QUndoGroup(this);

    m_actionUndo = m_undoGroup->createUndoAction(this);
    m_actionUndo->setEnabled(false);

    m_actionUndo->setIcon(QIcon::fromTheme(QStringLiteral("edit-undo"), createIconSet(QStringLiteral("undo.png"))));
    m_actionRedo = m_undoGroup->createRedoAction(this);
    m_actionRedo->setEnabled(false);
    m_actionRedo->setIcon(QIcon::fromTheme(QStringLiteral("edit-redo"), createIconSet(QStringLiteral("redo.png"))));

    m_actionShowFormWindowSettingsDialog = new QAction(tr("Form &Settings..."), this);
    m_actionShowFormWindowSettingsDialog->setObjectName(QStringLiteral("__qt_form_settings_action"));
    connect(m_actionShowFormWindowSettingsDialog, &QAction::triggered,
            this, &FormWindowManager::slotActionShowFormWindowSettingsDialog);
    m_actionShowFormWindowSettingsDialog->setEnabled(false);
}

#if QT_CONFIG(clipboard)
void FormWindowManager::slotActionCutActivated()
{
    m_activeFormWindow->cut();
}

void FormWindowManager::slotActionCopyActivated()
{
    m_activeFormWindow->copy();
    slotUpdateActions();
}

void FormWindowManager::slotActionPasteActivated()
{
    m_activeFormWindow->paste();
}
#endif

void FormWindowManager::slotActionDeleteActivated()
{
    m_activeFormWindow->deleteWidgets();
}

void FormWindowManager::slotActionLowerActivated()
{
    m_activeFormWindow->lowerWidgets();
}

void FormWindowManager::slotActionRaiseActivated()
{
    m_activeFormWindow->raiseWidgets();
}

static inline QWidget *findLayoutContainer(const FormWindow *fw)
{
    QWidgetList l(fw->selectedWidgets());
    fw->simplifySelection(&l);
    return l.empty() ? fw->mainContainer() : l.front();
}

void FormWindowManager::createLayout()
{
    QAction *a = qobject_cast<QAction *>(sender());
    if (!a)
        return;
    const int type = a->data().toInt();
    switch (m_createLayoutContext) {
    case LayoutContainer:
        // Cannot create a splitter on a container
        if (type != LayoutInfo::HSplitter && type != LayoutInfo::VSplitter)
            m_activeFormWindow->createLayout(type, findLayoutContainer(m_activeFormWindow));
        break;
    case LayoutSelection:
        m_activeFormWindow->createLayout(type);
        break;
    case MorphLayout:
        m_activeFormWindow->morphLayout(m_morphLayoutContainer, type);
        break;
    }
}

void FormWindowManager::slotActionBreakLayoutActivated()
{
    const QWidgetList layouts = layoutsToBeBroken();
    if (layouts.isEmpty())
        return;

    if (debugFWM) {
        qDebug() << "slotActionBreakLayoutActivated: " << layouts.size();
        for (const QWidget *w : layouts)
            qDebug() << w;
    }

    m_activeFormWindow->beginCommand(tr("Break Layout"));
    for (QWidget *layout : layouts)
        m_activeFormWindow->breakLayout(layout);
    m_activeFormWindow->endCommand();
}

void FormWindowManager::slotActionSimplifyLayoutActivated()
{
    Q_ASSERT(m_activeFormWindow != nullptr);
    QWidgetList selectedWidgets = m_activeFormWindow->selectedWidgets();
    m_activeFormWindow->simplifySelection(&selectedWidgets);
    if (selectedWidgets.size() != 1)
        return;
    SimplifyLayoutCommand *cmd = new SimplifyLayoutCommand(m_activeFormWindow);
    if (cmd->init(selectedWidgets.front())) {
        m_activeFormWindow->commandHistory()->push(cmd);
    } else {
        delete cmd;
    }
}

void FormWindowManager::slotActionAdjustSizeActivated()
{
    Q_ASSERT(m_activeFormWindow != nullptr);

    m_activeFormWindow->beginCommand(tr("Adjust Size"));

    QWidgetList selectedWidgets = m_activeFormWindow->selectedWidgets();
    m_activeFormWindow->simplifySelection(&selectedWidgets);

    if (selectedWidgets.isEmpty()) {
        Q_ASSERT(m_activeFormWindow->mainContainer() != nullptr);
        selectedWidgets.append(m_activeFormWindow->mainContainer());
    }

    // Always count the main container as unlaid-out
    for (QWidget *widget : qAsConst(selectedWidgets)) {
        bool unlaidout = LayoutInfo::layoutType(core(), widget->parentWidget()) == LayoutInfo::NoLayout;
        bool isMainContainer = m_activeFormWindow->isMainContainer(widget);

        if (unlaidout || isMainContainer) {
            AdjustWidgetSizeCommand *cmd = new AdjustWidgetSizeCommand(m_activeFormWindow);
            cmd->init(widget);
            m_activeFormWindow->commandHistory()->push(cmd);
        }
    }

    m_activeFormWindow->endCommand();
}

void FormWindowManager::slotActionSelectAllActivated()
{
    m_activeFormWindow->selectAll();
}

void FormWindowManager::showPreview()
{
    slotActionGroupPreviewInStyle(QString(), -1);
}

void FormWindowManager::slotActionGroupPreviewInStyle(const QString &style, int deviceProfileIndex)
{
    QDesignerFormWindowInterface *fw = activeFormWindow();
    if (!fw)
        return;

    QString errorMessage;
    if (!m_previewManager->showPreview(fw, style, deviceProfileIndex, &errorMessage)) {
        const QString title = tr("Could not create form preview", "Title of warning message box");
        core()->dialogGui()->message(fw, QDesignerDialogGuiInterface::FormEditorMessage, QMessageBox::Warning,
                                     title, errorMessage);
    }
}

// The user might click on a layout child or the actual layout container.
QWidgetList FormWindowManager::layoutsToBeBroken(QWidget *w) const
{
    if (!w)
        return QWidgetList();

    if (debugFWM)
        qDebug() << "layoutsToBeBroken: " << w;

    QWidget *parent = w->parentWidget();
    if (m_activeFormWindow->isMainContainer(w))
        parent = nullptr;

    QWidget *widget = core()->widgetFactory()->containerOfWidget(w);

    // maybe we want to remove following block
    const QDesignerWidgetDataBaseInterface *db = m_core->widgetDataBase();
    const QDesignerWidgetDataBaseItemInterface *item = db->item(db->indexOfObject(widget));
    if (!item) {
        if (debugFWM)
            qDebug() << "layoutsToBeBroken: Don't have an item, recursing for parent";
        return layoutsToBeBroken(parent);
    }

    const bool layoutContainer = (item->isContainer() || m_activeFormWindow->isMainContainer(widget));

    if (!layoutContainer) {
        if (debugFWM)
            qDebug() << "layoutsToBeBroken: Not a container, recursing for parent";
        return layoutsToBeBroken(parent);
    }

    QLayout *widgetLayout = widget->layout();
    QLayout *managedLayout = LayoutInfo::managedLayout(m_core, widgetLayout);
    if (!managedLayout) {
        if (qobject_cast<const QSplitter *>(widget)) {
            if (debugFWM)
                qDebug() << "layoutsToBeBroken: Splitter special";
            QWidgetList list = layoutsToBeBroken(parent);
            list.append(widget);
            return list;
        }
        if (debugFWM)
            qDebug() << "layoutsToBeBroken: Is a container but doesn't have a managed layout (has an internal layout), returning 0";
        return QWidgetList();
    }

    if (managedLayout) {
        QWidgetList list;
        if (debugFWM)
            qDebug() << "layoutsToBeBroken: Is a container and has a layout";
        if (qobject_cast<const QLayoutWidget *>(widget)) {
            if (debugFWM)
                qDebug() << "layoutsToBeBroken: red layout special case";
            list = layoutsToBeBroken(parent);
        }
        list.append(widget);
        return list;
    }
    if (debugFWM)
        qDebug() << "layoutsToBeBroken: Is a container but doesn't have a layout at all, returning 0";
    return QWidgetList();

}

QSet<QWidget *> FormWindowManager::getUnsortedLayoutsToBeBroken(bool firstOnly) const
{
    // Return a set of layouts to be broken.
    QSet<QWidget *> layouts;

    QWidgetList selection = m_activeFormWindow->selectedWidgets();
    if (selection.isEmpty() && m_activeFormWindow->mainContainer())
        selection.append(m_activeFormWindow->mainContainer());

    for (QWidget *selectedWidget : qAsConst(selection)) {
        // find all layouts
        const QWidgetList &list = layoutsToBeBroken(selectedWidget);
        if (!list.empty()) {
            for (QWidget *widget : list)
                layouts.insert(widget);
            if (firstOnly)
                return layouts;
        }
    }
    return layouts;
}

bool FormWindowManager::hasLayoutsToBeBroken() const
{
    // Quick check for layouts to be broken
    return !getUnsortedLayoutsToBeBroken(true).isEmpty();
}

QWidgetList FormWindowManager::layoutsToBeBroken() const
{
    // Get all layouts. This is a list of all 'red' layouts (QLayoutWidgets)
    // up to the first 'real' widget with a layout in hierarchy order.
    const QSet<QWidget *> unsortedLayouts = getUnsortedLayoutsToBeBroken(false);
    // Sort in order of hierarchy
    QWidgetList orderedLayoutList;
    for (QWidget *wToBeInserted : unsortedLayouts) {
        if (!orderedLayoutList.contains(wToBeInserted)) {
            // try to find first child, use as insertion position, else append
            const QWidgetList::iterator firstChildPos = findFirstChildOf(orderedLayoutList.begin(), orderedLayoutList.end(), wToBeInserted);
            if (firstChildPos == orderedLayoutList.end()) {
                orderedLayoutList.push_back(wToBeInserted);
            } else {
                orderedLayoutList.insert(firstChildPos, wToBeInserted);
            }
        }
    }
    return orderedLayoutList;
}

static inline bool hasManagedLayoutItems(const QDesignerFormEditorInterface *core, QWidget *w)
{
    if (const QLayout *ml = LayoutInfo::managedLayout(core, w)) {
        // Try to find managed items, ignore dummy grid spacers
        const int count = ml->count();
        for (int i = 0; i < count; i++)
            if (!LayoutInfo::isEmptyItem(ml->itemAt(i)))
                return true;
    }
    return false;
}

void FormWindowManager::slotUpdateActions()
{
    m_createLayoutContext = LayoutSelection;
    m_morphLayoutContainer = nullptr;
    bool canMorphIntoVBoxLayout = false;
    bool canMorphIntoHBoxLayout = false;
    bool canMorphIntoGridLayout = false;
    bool canMorphIntoFormLayout = false;
    int selectedWidgetCount = 0;
    int laidoutWidgetCount = 0;
    int unlaidoutWidgetCount = 0;
#if QT_CONFIG(clipboard)
    bool pasteAvailable = false;
#endif
    bool layoutAvailable = false;
    bool breakAvailable = false;
    bool simplifyAvailable = false;
    bool layoutContainer = false;
    bool canChangeZOrder = true;

    do {
        if (m_activeFormWindow == nullptr || m_activeFormWindow->currentTool() != 0)
            break;

        breakAvailable = hasLayoutsToBeBroken();

        QWidgetList simplifiedSelection = m_activeFormWindow->selectedWidgets();

        selectedWidgetCount = simplifiedSelection.count();
#if QT_CONFIG(clipboard)
        pasteAvailable = qApp->clipboard()->mimeData() && qApp->clipboard()->mimeData()->hasText();
#endif

        m_activeFormWindow->simplifySelection(&simplifiedSelection);
        QWidget *mainContainer = m_activeFormWindow->mainContainer();
        if (simplifiedSelection.isEmpty() && mainContainer)
            simplifiedSelection.append(mainContainer);

        // Always count the main container as unlaid-out
        const QWidgetList::const_iterator cend = simplifiedSelection.constEnd();
        for (QWidgetList::const_iterator it = simplifiedSelection.constBegin(); it != cend; ++it) {
            if (*it != mainContainer && LayoutInfo::isWidgetLaidout(m_core, *it)) {
                ++laidoutWidgetCount;
            } else {
                ++unlaidoutWidgetCount;
            }
            if (qobject_cast<const QLayoutWidget *>(*it) || qobject_cast<const Spacer *>(*it))
                canChangeZOrder = false;
        }

        // Figure out layouts: Looking at a group of dangling widgets
        if (simplifiedSelection.count() != 1) {
            layoutAvailable = unlaidoutWidgetCount > 1;
            //breakAvailable = false;
            break;
        }
        // Manipulate layout of a single widget
        m_createLayoutContext = LayoutSelection;
        QWidget *widget = core()->widgetFactory()->containerOfWidget(simplifiedSelection.first());
        if (widget == nullptr) // We are looking at a page-based container with 0 pages
            break;

        const QDesignerWidgetDataBaseInterface *db = m_core->widgetDataBase();
        const QDesignerWidgetDataBaseItemInterface *item = db->item(db->indexOfObject(widget));
        if (!item)
            break;

        QLayout *widgetLayout = LayoutInfo::internalLayout(widget);
        QLayout *managedLayout = LayoutInfo::managedLayout(m_core, widgetLayout);
        // We don't touch a layout created by a custom widget
        if (widgetLayout && !managedLayout)
            break;

        layoutContainer = (item->isContainer() || m_activeFormWindow->isMainContainer(widget));

        layoutAvailable = layoutContainer && m_activeFormWindow->hasInsertedChildren(widget) && managedLayout == nullptr;
        simplifyAvailable = SimplifyLayoutCommand::canSimplify(m_core, widget);
        if (layoutAvailable) {
            m_createLayoutContext = LayoutContainer;
        } else {
            /* Cannot create a layout, have some layouts to be broken and
             * exactly one, non-empty layout with selected: check the morph layout options
             * (Note that there might be > 1 layouts to broken if the selection
             * is a red layout, however, we want the inner-most layout here). */
            if (breakAvailable && simplifiedSelection.size() == 1
                && hasManagedLayoutItems(m_core, widget)) {
                int type;
                m_morphLayoutContainer = widget; // Was: page of first selected
                m_createLayoutContext = MorphLayout;
                if (MorphLayoutCommand::canMorph(m_activeFormWindow, m_morphLayoutContainer, &type)) {
                    canMorphIntoVBoxLayout = type != LayoutInfo::VBox;
                    canMorphIntoHBoxLayout = type != LayoutInfo::HBox;
                    canMorphIntoGridLayout = type != LayoutInfo::Grid;
                    canMorphIntoFormLayout = type != LayoutInfo::Form;
                }
            }
        }
    } while(false);

#if QT_CONFIG(clipboard)
    m_actionCut->setEnabled(selectedWidgetCount > 0);
    m_actionCopy->setEnabled(selectedWidgetCount > 0);
    m_actionPaste->setEnabled(pasteAvailable);
#endif
    m_actionDelete->setEnabled(selectedWidgetCount > 0);
    m_actionLower->setEnabled(canChangeZOrder && selectedWidgetCount > 0);
    m_actionRaise->setEnabled(canChangeZOrder && selectedWidgetCount > 0);


    m_actionSelectAll->setEnabled(m_activeFormWindow != nullptr);

    m_actionAdjustSize->setEnabled(unlaidoutWidgetCount > 0);

    m_actionHorizontalLayout->setEnabled(layoutAvailable || canMorphIntoHBoxLayout);
    m_actionVerticalLayout->setEnabled(layoutAvailable || canMorphIntoVBoxLayout);
    m_actionSplitHorizontal->setEnabled(layoutAvailable && !layoutContainer);
    m_actionSplitVertical->setEnabled(layoutAvailable && !layoutContainer);
    m_actionFormLayout->setEnabled(layoutAvailable || canMorphIntoFormLayout);
    m_actionGridLayout->setEnabled(layoutAvailable || canMorphIntoGridLayout);

    m_actionBreakLayout->setEnabled(breakAvailable);
    m_actionSimplifyLayout->setEnabled(simplifyAvailable);
    m_actionShowFormWindowSettingsDialog->setEnabled(m_activeFormWindow != nullptr);
}

QDesignerFormWindowInterface *FormWindowManager::createFormWindow(QWidget *parentWidget, Qt::WindowFlags flags)
{
    FormWindow *formWindow = new FormWindow(qobject_cast<FormEditor*>(core()), parentWidget, flags);
    formWindow->setProperty(WidgetFactory::disableStyleCustomPaintingPropertyC, QVariant(true));
    addFormWindow(formWindow);
    return formWindow;
}

QPixmap FormWindowManager::createPreviewPixmap() const
{
    const QDesignerFormWindowInterface *fw = activeFormWindow();
    if (!fw)
        return QPixmap();
    QString errorMessage;
    const QPixmap pix = m_previewManager->createPreviewPixmap(fw, QString(), &errorMessage);
    if (pix.isNull() && !errorMessage.isEmpty())
        qWarning("Preview pixmap creation failed: %s", qPrintable(errorMessage));
    return pix;
}

void FormWindowManager::deviceProfilesChanged()
{
    if (m_actionGroupPreviewInStyle)
        m_actionGroupPreviewInStyle->updateDeviceProfiles();
}

// DnD stuff

void FormWindowManager::dragItems(const QList<QDesignerDnDItemInterface*> &item_list)
{
    QDesignerMimeData::execDrag(item_list, m_core->topLevel());
}

QUndoGroup *FormWindowManager::undoGroup() const
{
    return m_undoGroup;
}

void FormWindowManager::slotActionShowFormWindowSettingsDialog()
{
    QDesignerFormWindowInterface *fw = activeFormWindow();
    if (!fw)
        return;

    QDialog *settingsDialog = nullptr;
    const bool wasDirty = fw->isDirty();

    // Ask the language extension for a dialog. If not, create our own
    if (QDesignerLanguageExtension *lang = qt_extension<QDesignerLanguageExtension*>(m_core->extensionManager(), m_core))
        settingsDialog = lang->createFormWindowSettingsDialog(fw, /*parent=*/ nullptr);

    if (!settingsDialog)
        settingsDialog = new FormWindowSettings(fw);

    QString title = QFileInfo(fw->fileName()).fileName();
    if (title.isEmpty()) // Grab the title from the outer window if no filename
        if (const QWidget *window = m_core->integration()->containerWindow(fw))
            title = window->windowTitle();

    settingsDialog->setWindowTitle(tr("Form Settings - %1").arg(title));
    if (settingsDialog->exec())
        if (fw->isDirty() != wasDirty)
            emit formWindowSettingsChanged(fw);

    delete settingsDialog;
}

QAction *FormWindowManager::action(Action action) const
{
    switch (action) {
#if QT_CONFIG(clipboard)
    case QDesignerFormWindowManagerInterface::CutAction:
        return m_actionCut;
    case QDesignerFormWindowManagerInterface::CopyAction:
        return m_actionCopy;
    case QDesignerFormWindowManagerInterface::PasteAction:
        return m_actionPaste;
#endif
    case QDesignerFormWindowManagerInterface::DeleteAction:
        return m_actionDelete;
    case QDesignerFormWindowManagerInterface::SelectAllAction:
        return m_actionSelectAll;
    case QDesignerFormWindowManagerInterface::LowerAction:
        return m_actionLower;
    case QDesignerFormWindowManagerInterface::RaiseAction:
        return m_actionRaise;
    case QDesignerFormWindowManagerInterface::UndoAction:
        return m_actionUndo;
    case QDesignerFormWindowManagerInterface::RedoAction:
        return m_actionRedo;
    case QDesignerFormWindowManagerInterface::HorizontalLayoutAction:
        return m_actionHorizontalLayout;
    case QDesignerFormWindowManagerInterface::VerticalLayoutAction:
        return m_actionVerticalLayout;
    case QDesignerFormWindowManagerInterface::SplitHorizontalAction:
        return m_actionSplitHorizontal;
    case QDesignerFormWindowManagerInterface::SplitVerticalAction:
        return m_actionSplitVertical;
    case QDesignerFormWindowManagerInterface::GridLayoutAction:
        return m_actionGridLayout;
    case QDesignerFormWindowManagerInterface::FormLayoutAction:
        return m_actionFormLayout;
    case QDesignerFormWindowManagerInterface::BreakLayoutAction:
        return m_actionBreakLayout;
    case QDesignerFormWindowManagerInterface::AdjustSizeAction:
        return m_actionAdjustSize;
    case QDesignerFormWindowManagerInterface::SimplifyLayoutAction:
        return m_actionSimplifyLayout;
    case QDesignerFormWindowManagerInterface::DefaultPreviewAction:
        return m_actionDefaultPreview;
    case QDesignerFormWindowManagerInterface::FormWindowSettingsDialogAction:
        return m_actionShowFormWindowSettingsDialog;
    }
    qWarning("FormWindowManager::action: Unhanded enumeration value %d", action);
    return nullptr;
}

QActionGroup *FormWindowManager::actionGroup(ActionGroup actionGroup) const
{
    switch (actionGroup) {
    case QDesignerFormWindowManagerInterface::StyledPreviewActionGroup:
        if (m_actionGroupPreviewInStyle == nullptr) {
            // Wish we could make the 'this' pointer mutable ;-)
            QObject *parent = const_cast<FormWindowManager*>(this);
            m_actionGroupPreviewInStyle = new PreviewActionGroup(m_core, parent);
            connect(m_actionGroupPreviewInStyle, &PreviewActionGroup::preview,
                    this, &FormWindowManager::slotActionGroupPreviewInStyle);
        }
        return m_actionGroupPreviewInStyle;
    }
    qWarning("FormWindowManager::actionGroup: Unhanded enumeration value %d", actionGroup);
    return nullptr;
}

}

QT_END_NAMESPACE
