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**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
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** $QT_END_LICENSE$
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****************************************************************************/

#include "abstractformbuilder.h"
#include "formbuilderextra_p.h"
#include "resourcebuilder_p.h"
#include "textbuilder_p.h"
#include "ui4_p.h"
#include "properties_p.h"

#include <QtWidgets/qmainwindow.h>
#include <QtWidgets/qmenu.h>
#include <QtWidgets/qmenubar.h>
#include <QtWidgets/qstatusbar.h>
#include <QtWidgets/qtoolbar.h>
#include <QtWidgets/qmdiarea.h>
#include <QtWidgets/qdockwidget.h>
#include <QtWidgets/qwizard.h>
#include <QtWidgets/qstackedwidget.h>
#include <QtWidgets/qtoolbox.h>
#include <QtWidgets/qtabwidget.h>
#include <QtWidgets/qsplitter.h>
#include <QtWidgets/qbuttongroup.h>
#include <QtWidgets/qboxlayout.h>
#include <QtWidgets/qformlayout.h>
#include <QtWidgets/qgridlayout.h>
#include <QtWidgets/qscrollarea.h>
#include <QtWidgets/qtreewidget.h>
#include <QtWidgets/qlistwidget.h>
#include <QtWidgets/qheaderview.h>
#include <QtWidgets/qtablewidget.h>
#include <QtWidgets/qfontcombobox.h>
#include <QtWidgets/qpushbutton.h>
#ifndef QFORMINTERNAL_NAMESPACE
#  include <private/qlayout_p.h> // Compiling within Designer
#endif

#include <QtGui/qaction.h>
#include <QtGui/qactiongroup.h>

#include <QtCore/qcoreapplication.h>
#include <QtCore/qdebug.h>
#include <QtCore/qdir.h>
#include <QtCore/qfileinfo.h>
#include <QtCore/qhash.h>
#include <QtCore/qmetaobject.h>
#include <QtCore/qpair.h>
#include <QtCore/qqueue.h>
#include <QtCore/qvariant.h>
#include <QtCore/qxmlstream.h>

#include <limits.h>

#include <algorithm>
#include <iterator>

Q_DECLARE_METATYPE(QWidgetList)

static const char *buttonGroupPropertyC = "buttonGroup";

QT_BEGIN_NAMESPACE

#ifdef QFORMINTERNAL_NAMESPACE
using namespace QFormInternal;
#endif

class QFriendlyLayout: public QLayout
{
public:
    inline QFriendlyLayout() { Q_ASSERT(0); }

#ifdef QFORMINTERNAL_NAMESPACE
    friend class QFormInternal::QAbstractFormBuilder;
#else
    friend class QAbstractFormBuilder;
#endif
};

/*!
    \class QAbstractFormBuilder

    \brief The QAbstractFormBuilder class provides a default
    implementation for classes that create user interfaces at
    run-time.

    \inmodule QtDesigner

    QAbstractFormBuilder provides a standard interface and a default
    implementation for constructing forms from user interface
    files. It is not intended to be instantiated directly. Use the
    QFormBuilder class to create user interfaces from UI files at
    run-time. For example:

    \snippet lib/tools_designer_src_lib_uilib_abstractformbuilder.cpp 0

    To override certain aspects of the form builder's behavior,
    subclass QAbstractFormBuilder and reimplement the relevant virtual
    functions:

    \list
    \li load() handles reading of UI format files from arbitrary
       QIODevices, and construction of widgets from the XML data
       that they contain.
    \li save() handles saving of widget details in UI format to
       arbitrary QIODevices.
    \li workingDirectory() and setWorkingDirectory() control the
       directory in which forms are held. The form builder looks for
       other resources on paths relative to this directory.
    \endlist

    The QFormBuilder class is typically used by custom components and
    applications that embed \QD. Standalone applications that need to
    dynamically generate user interfaces at run-time use the
    QUiLoader, found in the \l{Qt UI Tools} module.

    \sa {Qt UI Tools}
*/

/*!
    Constructs a new form builder.*/
QAbstractFormBuilder::QAbstractFormBuilder() : d(new QFormBuilderExtra)
{
    setResourceBuilder(new QResourceBuilder());
    setTextBuilder(new QTextBuilder());
}

/*!
    Destroys the form builder.*/
QAbstractFormBuilder::~QAbstractFormBuilder() = default;

/*!
    \fn QWidget *QAbstractFormBuilder::load(QIODevice *device, QWidget *parent)

    Loads an XML representation of a widget from the given \a device,
    and constructs a new widget with the specified \a parent.

    \sa save(), errorString()
*/
QWidget *QAbstractFormBuilder::load(QIODevice *dev, QWidget *parentWidget)
{
    QScopedPointer<DomUI> ui(d->readUi(dev));
    if (ui.isNull())
        return nullptr;
    QWidget *widget = create(ui.data(), parentWidget);
    if (!widget && d->m_errorString.isEmpty())
        d->m_errorString = QFormBuilderExtra::msgInvalidUiFile();
    return widget;
}

/*!
    \internal
*/
QWidget *QAbstractFormBuilder::create(DomUI *ui, QWidget *parentWidget)
{
    using ButtonGroupHash = QFormBuilderExtra::ButtonGroupHash;

    d->clear();
    if (const DomLayoutDefault *def = ui->elementLayoutDefault()) {
       d->m_defaultMargin = def->hasAttributeMargin() ? def->attributeMargin() : INT_MIN;
       d->m_defaultSpacing = def->hasAttributeSpacing() ? def->attributeSpacing() : INT_MIN;
    }

    DomWidget *ui_widget = ui->elementWidget();
    if (!ui_widget)
        return nullptr;

    initialize(ui);

    if (const DomButtonGroups *domButtonGroups = ui->elementButtonGroups())
        d->registerButtonGroups(domButtonGroups);

    if (QWidget *widget = create(ui_widget, parentWidget)) {
        // Reparent button groups that were actually created to main container for them to be found in the signal/slot part
        const ButtonGroupHash &buttonGroups = d->buttonGroups();
        if (!buttonGroups.isEmpty()) {
            const ButtonGroupHash::const_iterator cend = buttonGroups.constEnd();
            for (ButtonGroupHash::const_iterator it = buttonGroups.constBegin(); it != cend; ++it)
                if (it.value().second)
                    it.value().second->setParent(widget);
        }
        createConnections(ui->elementConnections(), widget);
        createResources(ui->elementResources()); // maybe this should go first, before create()...
        applyTabStops(widget, ui->elementTabStops());
        d->applyInternalProperties();
        reset();
        d->clear();
        return widget;
    }
    d->clear();
    return nullptr;
}

/*!
    \internal
    Retrieve relevant information from the custom widgets section.
    Called by create(DomUI *, QWidget *); call manually if you
    just use create(DomWidget *, QWidget *) on some child widget of DomUI.
 */

void QAbstractFormBuilder::initialize(const DomUI *ui)
{
    DomCustomWidgets *domCustomWidgets  = ui->elementCustomWidgets();
    createCustomWidgets(domCustomWidgets);

    if (domCustomWidgets) {
        const auto &customWidgets = domCustomWidgets->elementCustomWidget();
        for (const DomCustomWidget *w : customWidgets)
            d->storeCustomWidgetData(w->elementClass(), w);
    }
}

/*!
    \internal
*/
QWidget *QAbstractFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidget)
{
    QWidget *w = createWidget(ui_widget->attributeClass(), parentWidget, ui_widget->attributeName());
    if (!w)
        return nullptr;

    applyProperties(w, ui_widget->elementProperty());

    const auto &elementAction = ui_widget->elementAction();
    for (DomAction *ui_action : elementAction) {
        QAction *child_action = create(ui_action, w);
        Q_UNUSED( child_action );
    }

    const auto &elementActionGroup = ui_widget->elementActionGroup();
    for (DomActionGroup *ui_action_group : elementActionGroup) {
        QActionGroup *child_action_group = create(ui_action_group, w);
        Q_UNUSED( child_action_group );
    }

    QWidgetList children;
    const auto &elementWidget = ui_widget->elementWidget();
    for (DomWidget *ui_child : elementWidget) {
        if (QWidget *child  = create(ui_child, w)) {
            children += child;
        } else {
            const QString className = ui_child->elementClass().value(0);
            uiLibWarning(QCoreApplication::translate("QAbstractFormBuilder", "The creation of a widget of the class '%1' failed.").arg(className));
        }
    }

    const auto &elementLayout = ui_widget->elementLayout();
    for (DomLayout *ui_lay : elementLayout) {
        QLayout *child_lay = create(ui_lay, nullptr, w);
        Q_UNUSED( child_lay );
    }

    const auto &addActions = ui_widget->elementAddAction();
    if (!addActions.isEmpty()) {
        const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
        for (DomActionRef *ui_action_ref : addActions) {
            const QString name = ui_action_ref->attributeName();
            if (name == strings.separator) {
                QAction *sep = new QAction(w);
                sep->setSeparator(true);
                w->addAction(sep);
                addMenuAction(sep);
            } else if (QAction *a = d->m_actions.value(name)) {
                w->addAction(a);
            } else if (QActionGroup *g = d->m_actionGroups.value(name)) {
                w->addActions(g->actions());
            } else if (QMenu *menu = w->findChild<QMenu*>(name)) {
                w->addAction(menu->menuAction());
                addMenuAction(menu->menuAction());
            }
        }
    }

    loadExtraInfo(ui_widget, w, parentWidget);
    addItem(ui_widget, w, parentWidget);

    if (qobject_cast<QDialog *>(w) && parentWidget)
        w->setAttribute(Qt::WA_Moved, false); // So that QDialog::setVisible(true) will center it

    const QStringList zOrderNames = ui_widget->elementZOrder();
    if (!zOrderNames.isEmpty()) {
        QWidgetList zOrder = qvariant_cast<QWidgetList>(w->property("_q_zOrder"));
        for (const QString &widgetName : zOrderNames) {
            if (QWidget *child = w->findChild<QWidget*>(widgetName)) {
                if (child->parentWidget() == w) {
                    zOrder.removeAll(child);
                    zOrder.append(child);
                    child->raise();
                }
            }
        }
        w->setProperty("_q_zOrder", QVariant::fromValue(zOrder));
    }

    return w;
}

/*!
    \internal
*/
QAction *QAbstractFormBuilder::create(DomAction *ui_action, QObject *parent)
{
    QAction *a = createAction(parent, ui_action->attributeName());
    if (!a)
        return nullptr;

    d->m_actions.insert(ui_action->attributeName(), a);
    applyProperties(a, ui_action->elementProperty());
    return a;
}

/*!
    \internal
*/
QActionGroup *QAbstractFormBuilder::create(DomActionGroup *ui_action_group, QObject *parent)
{
    QActionGroup *a = createActionGroup(parent, ui_action_group->attributeName());
    if (!a)
        return nullptr;
    d->m_actionGroups.insert(ui_action_group->attributeName(), a);
    applyProperties(a, ui_action_group->elementProperty());

    const auto &elementAction = ui_action_group->elementAction();
    for (DomAction *ui_action : elementAction) {
        QAction *child_action = create(ui_action, a);
        Q_UNUSED( child_action );
    }

    const auto &elementActionGroup = ui_action_group->elementActionGroup();
    for (DomActionGroup *g : elementActionGroup) {
        QActionGroup *child_action_group = create(g, parent);
        Q_UNUSED( child_action_group );
    }

    return a;
}

// figure out the toolbar area of a DOM attrib list.
// By legacy, it is stored as an integer. As of 4.3.0, it is the enumeration value.
Qt::ToolBarArea QAbstractFormBuilder::toolbarAreaFromDOMAttributes(const DomPropertyHash &attributes) {
    const DomProperty *attr = attributes.value(QFormBuilderStrings::instance().toolBarAreaAttribute);
    if (!attr)
        return Qt::TopToolBarArea;
    switch(attr->kind()) {
    case DomProperty::Number:
        return static_cast<Qt::ToolBarArea>(attr->elementNumber());
    case DomProperty::Enum:
        return enumKeyOfObjectToValue<QAbstractFormBuilderGadget, Qt::ToolBarArea>("toolBarArea",
                                                                                   attr->elementEnum().toLatin1().constData());
    default:
        break;
    }
    return Qt::TopToolBarArea;
}

/*!
    \internal
*/
bool QAbstractFormBuilder::addItem(DomWidget *ui_widget, QWidget *widget, QWidget *parentWidget)
{
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    const DomPropertyHash attributes = propertyMap(ui_widget->elementAttribute());

    if (parentWidget == nullptr)
        return true;
    // Check special cases. First: Custom container
    const QString className = QLatin1String(parentWidget->metaObject()->className());
    const QString addPageMethod = d->customWidgetAddPageMethod(className);
    if (!addPageMethod.isEmpty()) {
        // If this fails ( non-existent or non-slot), use ContainerExtension in Designer, else it can't be helped
        return QMetaObject::invokeMethod(parentWidget, addPageMethod.toUtf8().constData(), Qt::DirectConnection, Q_ARG(QWidget*, widget));
    }

    if (QMainWindow *mw = qobject_cast<QMainWindow*>(parentWidget)) {

#if QT_CONFIG(menubar)
        // the menubar
        if (QMenuBar *menuBar = qobject_cast<QMenuBar*>(widget)) {
            mw->setMenuBar(menuBar);
            return true;
        }
#endif

#if QT_CONFIG(toolbar)
        // apply the toolbar's attributes
        if (QToolBar *toolBar = qobject_cast<QToolBar*>(widget)) {
            mw->addToolBar(toolbarAreaFromDOMAttributes(attributes), toolBar);
            // check break
            if (const DomProperty *attr = attributes.value(strings.toolBarBreakAttribute))
                if (attr->elementBool() == strings.trueValue)
                    mw->insertToolBarBreak (toolBar);

            return true;
        }
#endif

#if QT_CONFIG(statusbar)
        // statusBar
        if (QStatusBar *statusBar = qobject_cast<QStatusBar*>(widget)) {
            mw->setStatusBar(statusBar);
            return true;
        }
#endif

#if QT_CONFIG(dockwidget)
        // apply the dockwidget's attributes
        if (QDockWidget *dockWidget = qobject_cast<QDockWidget*>(widget)) {
            if (const DomProperty *attr = attributes.value(strings.dockWidgetAreaAttribute)) {
                Qt::DockWidgetArea area = static_cast<Qt::DockWidgetArea>(attr->elementNumber());
                if (!dockWidget->isAreaAllowed(area)) {
                    if (dockWidget->isAreaAllowed(Qt::LeftDockWidgetArea))
                        area = Qt::LeftDockWidgetArea;
                    else if (dockWidget->isAreaAllowed(Qt::RightDockWidgetArea))
                        area = Qt::RightDockWidgetArea;
                    else if (dockWidget->isAreaAllowed(Qt::TopDockWidgetArea))
                        area = Qt::TopDockWidgetArea;
                    else if (dockWidget->isAreaAllowed(Qt::BottomDockWidgetArea))
                        area = Qt::BottomDockWidgetArea;
                }
                mw->addDockWidget(area, dockWidget);
            } else {
                mw->addDockWidget(Qt::LeftDockWidgetArea, dockWidget);
            }
            return true;
        }
#endif

        if (!mw->centralWidget()) {
            mw->setCentralWidget(widget);
            return true;
        }
    }

#if QT_CONFIG(tabwidget)
    else if (QTabWidget *tabWidget = qobject_cast<QTabWidget*>(parentWidget)) {
        widget->setParent(nullptr);

        const int tabIndex = tabWidget->count();
        if (const DomProperty *titleP = attributes.value(strings.titleAttribute, 0))
            tabWidget->addTab(widget, toString(titleP->elementString()));
        else
            tabWidget->addTab(widget, strings.defaultTitle);

        if (DomProperty *picon = attributes.value(strings.iconAttribute)) {
            QVariant v = resourceBuilder()->loadResource(workingDirectory(), picon);
            QVariant nativeValue = resourceBuilder()->toNativeValue(v);
            tabWidget->setTabIcon(tabIndex, qvariant_cast<QIcon>(nativeValue));
        }

#if QT_CONFIG(tooltip)
        if (const DomProperty *ptoolTip = attributes.value(strings.toolTipAttribute)) {
            tabWidget->setTabToolTip(tabIndex, toString(ptoolTip->elementString()));
        }
#endif

#if QT_CONFIG(whatsthis)
        if (const DomProperty *pwhatsThis = attributes.value(strings.whatsThisAttribute)) {
            tabWidget->setTabWhatsThis(tabIndex, toString(pwhatsThis->elementString()));
        }
#endif

        return true;
    }
#endif

#if QT_CONFIG(toolbox)
    else if (QToolBox *toolBox = qobject_cast<QToolBox*>(parentWidget)) {
        const int tabIndex = toolBox->count();
        if (const DomProperty *labelP =  attributes.value(strings.labelAttribute, 0))
            toolBox->addItem(widget, toString(labelP->elementString()));
        else
            toolBox->addItem(widget, strings.defaultTitle);

        if (DomProperty *picon = attributes.value(strings.iconAttribute)) {
            QVariant v = resourceBuilder()->loadResource(workingDirectory(), picon);
            QVariant nativeValue = resourceBuilder()->toNativeValue(v);
            toolBox->setItemIcon(tabIndex, qvariant_cast<QIcon>(nativeValue));
        }

#if QT_CONFIG(tooltip)
        if (const DomProperty *ptoolTip = attributes.value(strings.toolTipAttribute)) {
            toolBox->setItemToolTip(tabIndex, toString(ptoolTip->elementString()));
        }
#endif

        return true;
    }
#endif

#if QT_CONFIG(stackedwidget)
    else if (QStackedWidget *stackedWidget = qobject_cast<QStackedWidget*>(parentWidget)) {
        stackedWidget->addWidget(widget);
        return true;
    }
#endif

#if QT_CONFIG(splitter)
    else if (QSplitter *splitter = qobject_cast<QSplitter*>(parentWidget)) {
        splitter->addWidget(widget);
        return true;
    }
#endif

#if QT_CONFIG(mdiarea)
    else if (QMdiArea *mdiArea = qobject_cast<QMdiArea*>(parentWidget)) {
        mdiArea->addSubWindow(widget);
        return true;
    }
#endif

#if QT_CONFIG(dockwidget)
    else if (QDockWidget *dockWidget = qobject_cast<QDockWidget*>(parentWidget)) {
        dockWidget->setWidget(widget);
        return true;
    }
#endif

#if QT_CONFIG(scrollarea)
    else if (QScrollArea *scrollArea = qobject_cast<QScrollArea*>(parentWidget)) {
        scrollArea->setWidget(widget);
        return true;
    }
#endif

#if QT_CONFIG(wizard)
    else if (QWizard *wizard = qobject_cast<QWizard *>(parentWidget)) {
        QWizardPage *page = qobject_cast<QWizardPage*>(widget);
        if (!page) {
            uiLibWarning(QCoreApplication::translate("QAbstractFormBuilder", "Attempt to add child that is not of class QWizardPage to QWizard."));
            return false;
        }
        wizard->addPage(page);
        return true;
    }
#endif
    return false;
}

/*!
    \internal
*/
void QAbstractFormBuilder::layoutInfo(DomLayout *ui_layout, QObject *parent, int *margin, int *spacing)
{
    Q_UNUSED(parent);
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    const DomPropertyHash properties = propertyMap(ui_layout->elementProperty());

    int mar = INT_MIN;
    int spac = INT_MIN;
    if (const DomProperty *p = properties.value(strings.marginProperty, 0))
        mar = p->elementNumber();

    if (const DomProperty *p = properties.value(strings.spacingProperty, 0))
        spac = p->elementNumber();

#ifdef Q_OS_MACOS
    // here we recognize UI file < 4.3 (no we don't store margin property)
    if (mar != INT_MIN) {
        const int defaultMargin = parent->inherits("QLayoutWidget") ? 0 : 9;
        if (mar == defaultMargin)
            mar = INT_MIN;
        if (spac == 6)
            spac = INT_MIN;

        if (mar == INT_MIN || spac == INT_MIN) {
            auto properties = ui_layout->elementProperty();
            for (auto it = properties.begin(); it != properties.end(); ) {
                DomProperty *prop = *it;
                if ((mar == INT_MIN && prop->attributeName() == strings.marginProperty)
                    || (spac == INT_MIN && prop->attributeName() == strings.spacingProperty)) {
                    delete prop;
                    it = properties.erase(it);
                } else {
                    ++it;
                }
            }
            ui_layout->setElementProperty(properties);
        }
    }
#endif
    if (margin)
        *margin = mar;
    if (spacing)
        *spacing = spac;
}

/*!
    \internal
*/
QLayout *QAbstractFormBuilder::create(DomLayout *ui_layout, QLayout *parentLayout, QWidget *parentWidget)
{
    QObject *p = parentLayout;

    if (p == nullptr)
        p = parentWidget;

    Q_ASSERT(p != nullptr);

    bool tracking = false;

    if (p == parentWidget && parentWidget->layout()) {
        tracking = true;
        p = parentWidget->layout();
    }

    QLayout *layout = createLayout(ui_layout->attributeClass(), p, ui_layout->hasAttributeName() ? ui_layout->attributeName() : QString());

    if (layout == nullptr)
        return 0;

    if (tracking && layout->parent() == nullptr) {
        QBoxLayout *box = qobject_cast<QBoxLayout*>(parentWidget->layout());
        if (!box) {  // only QBoxLayout is supported
            const QString widgetClass = QString::fromUtf8(parentWidget->metaObject()->className());
            const QString layoutClass = QString::fromUtf8(parentWidget->layout()->metaObject()->className());
            const QString msg = QCoreApplication::translate("QAbstractFormBuilder", "Attempt to add a layout to a widget '%1' (%2) which already has a layout of non-box type %3.\n"
                                            "This indicates an inconsistency in the ui-file.").
                                            arg(parentWidget->objectName(), widgetClass, layoutClass);
            uiLibWarning(msg);
            return nullptr;
        }
        box->addLayout(layout);
    }

    int margin = INT_MIN, spacing = INT_MIN;
    layoutInfo(ui_layout, p, &margin, &spacing);

    if (margin != INT_MIN) {
        layout->setContentsMargins(margin, margin, margin, margin);
    } else {
        const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
        int left, top, right, bottom;
        left = top = right = bottom = -1;
        layout->getContentsMargins(&left, &top, &right, &bottom);

        const DomPropertyHash properties = propertyMap(ui_layout->elementProperty());

        if (const DomProperty *p = properties.value(strings.leftMarginProperty, 0))
            left = p->elementNumber();

        if (const DomProperty *p = properties.value(strings.topMarginProperty, 0))
            top = p->elementNumber();

        if (const DomProperty *p = properties.value(strings.rightMarginProperty, 0))
            right = p->elementNumber();

        if (const DomProperty *p = properties.value(strings.bottomMarginProperty, 0))
            bottom = p->elementNumber();

        layout->setContentsMargins(left, top, right, bottom);
    }

    if (spacing != INT_MIN) {
        layout->setSpacing(spacing);
    } else {
        QGridLayout *grid = qobject_cast<QGridLayout *>(layout);
        if (grid) {
            const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
            const DomPropertyHash properties = propertyMap(ui_layout->elementProperty());

            if (const DomProperty *p = properties.value(strings.horizontalSpacingProperty, 0))
                grid->setHorizontalSpacing(p->elementNumber());
            if (const DomProperty *p = properties.value(strings.verticalSpacingProperty, 0))
                grid->setVerticalSpacing(p->elementNumber());
        }
    }

    applyProperties(layout, ui_layout->elementProperty());

    const auto &elementItem = ui_layout->elementItem();
    for (DomLayoutItem *ui_item : elementItem) {
        if (QLayoutItem *item = create(ui_item, layout, parentWidget)) {
            addItem(ui_item, item, layout);
        }
    }
    // Check the box stretch attributes
    if (QBoxLayout *box = qobject_cast<QBoxLayout*>(layout)) {
        const QString boxStretch = ui_layout->attributeStretch();
        if (!boxStretch.isEmpty())
            QFormBuilderExtra::setBoxLayoutStretch(boxStretch, box);
    }
    // Check the grid stretch/minimum size attributes
    if (QGridLayout *grid = qobject_cast<QGridLayout*>(layout)) {
        // Stretch
        const QString gridRowStretch = ui_layout->attributeRowStretch();
        if (!gridRowStretch.isEmpty())
            QFormBuilderExtra::setGridLayoutRowStretch(gridRowStretch, grid);
        const QString gridColumnStretch = ui_layout->attributeColumnStretch();
        if (!gridColumnStretch.isEmpty())
            QFormBuilderExtra::setGridLayoutColumnStretch(gridColumnStretch, grid);
        // Minimum size
        const QString gridColumnMinimumWidth = ui_layout->attributeColumnMinimumWidth();
        if (!gridColumnMinimumWidth.isEmpty())
            QFormBuilderExtra::setGridLayoutColumnMinimumWidth(gridColumnMinimumWidth, grid);
        const QString gridRowMinimumHeight = ui_layout->attributeRowMinimumHeight();
        if (!gridRowMinimumHeight.isEmpty())
            QFormBuilderExtra::setGridLayoutRowMinimumHeight(gridRowMinimumHeight, grid);
    }
    return layout;
}

#if QT_CONFIG(formlayout)
static inline QFormLayout::ItemRole formLayoutRole(int column, int colspan)
{
    if (colspan > 1)
        return QFormLayout::SpanningRole;
    return column == 0 ? QFormLayout::LabelRole : QFormLayout::FieldRole;
}
#endif

static inline QString alignmentValue(Qt::Alignment a)
{
    QString h,v;
    switch (a & Qt::AlignHorizontal_Mask) {
    case Qt::AlignLeft:
        h = QStringLiteral("Qt::AlignLeft");
        break;
    case Qt::AlignRight:
        h = QStringLiteral("Qt::AlignRight");
        break;
    case Qt::AlignHCenter:
        h = QStringLiteral("Qt::AlignHCenter");
        break;
    case Qt::AlignJustify:
        h = QStringLiteral("Qt::AlignJustify");
        break;
    }
    switch (a & Qt::AlignVertical_Mask) {
    case Qt::AlignTop:
        v = QStringLiteral("Qt::AlignTop");
        break;
    case Qt::AlignBottom:
        v = QStringLiteral("Qt::AlignBottom");
        break;
    case Qt::AlignVCenter:
        v = QStringLiteral("Qt::AlignVCenter");
        break;
    }
    if (h.isEmpty() && v.isEmpty())
        return QString();
    if (!v.isEmpty()) {
        if (!h.isEmpty())
            h += QLatin1Char('|');
        h += v;
    }
    return h;
}

static inline Qt::Alignment alignmentFromDom(const QString &in)
{
    Qt::Alignment rc;
    if (!in.isEmpty()) {
        const auto flags = QStringView{in}.split(QLatin1Char('|'));
        for (const auto &f : flags) {
            if (f == QStringLiteral("Qt::AlignLeft")) {
                rc |= Qt::AlignLeft;
            } else if (f == QStringLiteral("Qt::AlignRight")) {
                rc |= Qt::AlignRight;
            } else if (f == QStringLiteral("Qt::AlignHCenter")) {
                rc |= Qt::AlignHCenter;
            } else if (f == QStringLiteral("Qt::AlignJustify")) {
                rc |= Qt::AlignJustify;
            } else if (f == QStringLiteral("Qt::AlignTop")) {
                rc |= Qt::AlignTop;
            } else if (f == QStringLiteral("Qt::AlignBottom")) {
                rc |= Qt::AlignBottom;
            } else if (f == QStringLiteral("Qt::AlignVCenter")) {
                rc |= Qt::AlignVCenter;
            }
        }
    }
    return rc;
}

/*!
    \internal
*/
bool QAbstractFormBuilder::addItem(DomLayoutItem *ui_item, QLayoutItem *item, QLayout *layout)
{
    // Calling addChildWidget(), etc.  is required to maintain consistency of the layouts,
    // see documentation of addItem(), which should ideally not be used.
    if (item->widget()) {
        static_cast<QFriendlyLayout*>(layout)->addChildWidget(item->widget());
    } else if (item->layout()) {
        static_cast<QFriendlyLayout*>(layout)->addChildLayout(item->layout());
    } else if (item->spacerItem()) {
        // nothing to do
    } else {
        return false;
    }

    if (QGridLayout *grid = qobject_cast<QGridLayout*>(layout)) {
        const int rowSpan = ui_item->hasAttributeRowSpan() ? ui_item->attributeRowSpan() : 1;
        const int colSpan = ui_item->hasAttributeColSpan() ? ui_item->attributeColSpan() : 1;
        grid->addItem(item, ui_item->attributeRow(), ui_item->attributeColumn(),
                        rowSpan, colSpan, item->alignment());
        return true;
    }
#if QT_CONFIG(formlayout)
    if (QFormLayout *form = qobject_cast<QFormLayout *>(layout)) {
        const int row =  ui_item->attributeRow();
        const int colSpan = ui_item->hasAttributeColSpan() ? ui_item->attributeColSpan() : 1;
        form->setItem(row, formLayoutRole(ui_item->attributeColumn(), colSpan), item);
        return true;
    }

#endif
    layout->addItem(item);
    return true;
}

/*!
    \internal
*/
QLayoutItem *QAbstractFormBuilder::create(DomLayoutItem *ui_layoutItem, QLayout *layout, QWidget *parentWidget)
{
    switch (ui_layoutItem->kind()) {
    case DomLayoutItem::Widget: {
        if (QWidget *w = create(ui_layoutItem->elementWidget(), parentWidget)) {
#ifdef QFORMINTERNAL_NAMESPACE // uilib
            QWidgetItem *item = new QWidgetItemV2(w);
#else                         // Within Designer: Use factory method that returns special items that refuse to shrink to 0,0
            QWidgetItem *item = QLayoutPrivate::createWidgetItem(layout, w);
#endif
            item->setAlignment(alignmentFromDom(ui_layoutItem->attributeAlignment()));
            return item;
        }
        qWarning() << QCoreApplication::translate("QAbstractFormBuilder", "Empty widget item in %1 '%2'.").arg(QString::fromUtf8(layout->metaObject()->className()), layout->objectName());
        return nullptr;
    }
    case DomLayoutItem::Spacer: {
        QSize size(0, 0);
        QSizePolicy::Policy sizeType = QSizePolicy::Expanding;
        bool isVspacer = false;

        const DomSpacer *ui_spacer = ui_layoutItem->elementSpacer();
        const auto &spacerProperties =  ui_spacer->elementProperty();
        if (!spacerProperties.isEmpty()) {
            const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
            for (DomProperty *p : spacerProperties) {
                const QVariant v = toVariant(&QAbstractFormBuilderGadget::staticMetaObject, p); // ### remove me
                if (v.isNull())
                    continue;
                if (p->attributeName() == strings.sizeHintProperty && p->kind() == DomProperty::Size) {
                    size = v.toSize();  // ###  remove me
                } else if (p->attributeName() == strings.sizeTypeProperty && p->kind() == DomProperty::Enum) {
                    sizeType = static_cast<QSizePolicy::Policy>(v.toInt());
                } else if (p->attributeName() == strings.orientationProperty && p->kind() == DomProperty::Enum) {
                    const Qt::Orientation o = static_cast<Qt::Orientation>(v.toInt());
                    isVspacer = (o == Qt::Vertical);
                }
            }
        }

        QSpacerItem *spacer = nullptr;
        if (isVspacer)
            spacer = new QSpacerItem(size.width(), size.height(), QSizePolicy::Minimum, sizeType);
        else
            spacer = new QSpacerItem(size.width(), size.height(), sizeType, QSizePolicy::Minimum);
        return spacer; }

    case DomLayoutItem::Layout:
        return create(ui_layoutItem->elementLayout(), layout, parentWidget);

    default:
        break;
    }

    return nullptr;
}

/*!
    \internal
*/
void QAbstractFormBuilder::applyProperties(QObject *o, const QList<DomProperty*> &properties)
{
    for (DomProperty *p : properties) {
        const QVariant v = toVariant(o->metaObject(), p);
        if (!v.isNull()) {
            QString attributeName = p->attributeName();
            if (attributeName == QLatin1String("numDigits") && o->inherits("QLCDNumber")) // Deprecated in Qt 4, removed in Qt 5.
                attributeName = QLatin1String("digitCount");
            if (!d->applyPropertyInternally(o, attributeName, v))
                o->setProperty(attributeName.toUtf8(), v);
        }
    }
}


/*!
    \internal
    Check whether a property is applied internally by QAbstractFormBuilder. Call this
   from overwritten applyProperties().
*/

bool QAbstractFormBuilder::applyPropertyInternally(QObject *o, const QString &propertyName, const QVariant &value)
{
    return d->applyPropertyInternally(o,propertyName, value);
}

/*!
    \internal
*/

QVariant QAbstractFormBuilder::toVariant(const QMetaObject *meta, DomProperty *p)
{
    return domPropertyToVariant(this, meta, p);
}

/*!
    \internal
*/
void QAbstractFormBuilder::setupColorGroup(QPalette &palette, QPalette::ColorGroup colorGroup,
            DomColorGroup *group)
{
    QFormBuilderExtra::setupColorGroup(&palette, colorGroup, group);
}

/*!
    \internal
*/
DomColorGroup *QAbstractFormBuilder::saveColorGroup(const QPalette &palette)
{
    return QFormBuilderExtra::saveColorGroup(palette,
                                             palette.currentColorGroup());
}

/*!
    \internal
*/
QBrush QAbstractFormBuilder::setupBrush(DomBrush *brush)
{
    return QFormBuilderExtra::setupBrush(brush);
}

DomBrush *QAbstractFormBuilder::saveBrush(const QBrush &br)
{
    return QFormBuilderExtra::saveBrush(br);
}

/*!
    \internal
*/
QWidget *QAbstractFormBuilder::createWidget(const QString &widgetName, QWidget *parentWidget, const QString &name)
{
    Q_UNUSED(widgetName);
    Q_UNUSED(parentWidget);
    Q_UNUSED(name);
    return nullptr;
}

/*!
    \internal
*/
QLayout *QAbstractFormBuilder::createLayout(const QString &layoutName, QObject *parent, const QString &name)
{
    Q_UNUSED(layoutName);
    Q_UNUSED(parent);
    Q_UNUSED(name);
    return nullptr;
}

/*!
    \internal
*/
QAction *QAbstractFormBuilder::createAction(QObject *parent, const QString &name)
{
    QAction *action = new QAction(parent);
    action->setObjectName(name);
    return action;
}

/*!
    \internal
*/
QActionGroup *QAbstractFormBuilder::createActionGroup(QObject *parent, const QString &name)
{
    QActionGroup *g = new QActionGroup(parent);
    g->setObjectName(name);
    return g;
}

/*!
    \fn void QAbstractFormBuilder::save(QIODevice *device, QWidget *widget)

    Saves an XML representation of the given \a widget to the
    specified \a device in the standard UI file format.

    \note Unlike when saving a form in Qt Designer, all property values are
    written. This is because, the state of whether a property value was
    modified or not isn't stored in the Qt property system. The widget that
    is being saved, could have been created dynamically, not loaded via
    \l load(), so in this case the form builder isn't aware of the list of
    changed properties. Also, there's no generic way to do this for widgets
    that were created dynamically.

    Therefore, you should remove properties that are not required from your
    resulting XML files, before loading them. Alternatively, if you already
    know which properties you want to save when you call this method,
    you can overload \c computeProperties() and return a filtered list of
    required properties. Otherwise, unexpected behavior may occur as some
    of these properties may depend on each other.

    \sa load()
*/
void QAbstractFormBuilder::save(QIODevice *dev, QWidget *widget)
{
    DomWidget *ui_widget = createDom(widget, nullptr);
    Q_ASSERT( ui_widget != nullptr );

    DomUI *ui = new DomUI();
    ui->setAttributeVersion(QStringLiteral("4.0"));
    ui->setElementWidget(ui_widget);

    saveDom(ui, widget);

    QXmlStreamWriter writer(dev);
    writer.setAutoFormatting(true);
    writer.setAutoFormattingIndent(1);
    writer.writeStartDocument();
    ui->write(writer);
    writer.writeEndDocument();

    d->m_laidout.clear();

    delete ui;
}

/*!
    \internal
*/
void QAbstractFormBuilder::saveDom(DomUI *ui, QWidget *widget)
{
    ui->setElementClass(widget->objectName());

    if (DomConnections *ui_connections = saveConnections()) {
        ui->setElementConnections(ui_connections);
    }

    if (DomCustomWidgets *ui_customWidgets = saveCustomWidgets()) {
        ui->setElementCustomWidgets(ui_customWidgets);
    }

    if (DomTabStops *ui_tabStops = saveTabStops()) {
        ui->setElementTabStops(ui_tabStops);
    }

    if (DomResources *ui_resources = saveResources()) {
        ui->setElementResources(ui_resources);
    }
    if (DomButtonGroups *ui_buttonGroups = saveButtonGroups(widget))
        ui->setElementButtonGroups(ui_buttonGroups);
}

/*!
    \internal
*/
DomConnections *QAbstractFormBuilder::saveConnections()
{
    return new DomConnections;
}

/*!
    \internal
*/

DomWidget *QAbstractFormBuilder::createDom(QWidget *widget, DomWidget *ui_parentWidget, bool recursive)
{
    DomWidget *ui_widget = new DomWidget();
    ui_widget->setAttributeClass(QLatin1String(widget->metaObject()->className()));
    ui_widget->setAttributeName(widget->objectName());

    ui_widget->setElementProperty(computeProperties(widget));

    if (recursive) {
        if (QLayout *layout = widget->layout()) {
            if (DomLayout *ui_layout = createDom(layout, nullptr, ui_parentWidget)) {
                QList<DomLayout *> ui_layouts;
                ui_layouts.append(ui_layout);

                ui_widget->setElementLayout(ui_layouts);
            }
        }
    }

    // widgets, actions and action groups
    QList<DomWidget *> ui_widgets;
    QList<DomAction *> ui_actions;
    QList<DomActionGroup *> ui_action_groups;

    QObjectList children;

    // splitters need to store their children in the order specified by child indexes,
    // not the order of the child list.
#if QT_CONFIG(splitter)
    if (const QSplitter *splitter = qobject_cast<const QSplitter*>(widget)) {
        const int count = splitter->count();
        for (int i = 0; i < count; ++i)
            children.append(splitter->widget(i));
    } else
#endif
    {
        QObjectList childObjects = widget->children();

        const QWidgetList list = qvariant_cast<QWidgetList>(widget->property("_q_widgetOrder"));
        for (QWidget *w : list) {
            if (childObjects.contains(w)) {
                children.append(w);
                childObjects.removeAll(w);
            }
        }
        children += childObjects;

        const QWidgetList zOrder = qvariant_cast<QWidgetList>(widget->property("_q_zOrder"));
        if (list != zOrder) {
            QStringList zOrderList;
            zOrderList.reserve(zOrder.size());
            std::transform(zOrder.cbegin(), zOrder.cend(),
                           std::back_inserter(zOrderList),
                           [] (const QWidget *w) { return w->objectName(); });
            ui_widget->setElementZOrder(zOrderList);
        }
    }

    for (QObject *obj : qAsConst(children)) {
        if (QWidget *childWidget = qobject_cast<QWidget*>(obj)) {
            if (d->m_laidout.contains(childWidget) || !recursive)
                continue;

            if (QMenu *menu = qobject_cast<QMenu *>(childWidget)) {
                const auto actions = menu->parentWidget()->actions();
                const bool found =
                    std::any_of(actions.cbegin(), actions.cend(),
                                [menu] (const QAction *a) { return a->menu() == menu; });
                if (!found)
                    continue;
            }

            if (DomWidget *ui_child = createDom(childWidget, ui_widget)) {
                ui_widgets.append(ui_child);
            }
        } else if (QAction *childAction = qobject_cast<QAction*>(obj)) {
            if (childAction->actionGroup() != nullptr) {
                // it will be added later.
                continue;
            }

            if (DomAction *ui_action = createDom(childAction)) {
                ui_actions.append(ui_action);
            }
        } else if (QActionGroup *childActionGroup = qobject_cast<QActionGroup*>(obj)) {
            if (DomActionGroup *ui_action_group = createDom(childActionGroup)) {
                ui_action_groups.append(ui_action_group);
            }
        }
    }

    // add-action
    QList<DomActionRef *> ui_action_refs;
    const auto &actions = widget->actions();
    ui_action_refs.reserve(actions.size());
    for (QAction *action : actions) {
        if (DomActionRef *ui_action_ref = createActionRefDom(action)) {
            ui_action_refs.append(ui_action_ref);
        }
    }

    if (recursive)
        ui_widget->setElementWidget(ui_widgets);

    ui_widget->setElementAction(ui_actions);
    ui_widget->setElementActionGroup(ui_action_groups);
    ui_widget->setElementAddAction(ui_action_refs);

    saveExtraInfo(widget, ui_widget, ui_parentWidget);

    return ui_widget;
}

/*!
    \internal
*/
DomActionRef *QAbstractFormBuilder::createActionRefDom(QAction *action)
{
    QString name = action->objectName();

    if (action->menu() != nullptr)
        name = action->menu()->objectName();

    DomActionRef *ui_action_ref = new DomActionRef();
    if (action->isSeparator())
        ui_action_ref->setAttributeName(QFormBuilderStrings::instance().separator);
    else
        ui_action_ref->setAttributeName(name);

    return ui_action_ref;
}

// Struct to store layout item parameters for saving layout items
struct FormBuilderSaveLayoutEntry {
    explicit FormBuilderSaveLayoutEntry(QLayoutItem *li = nullptr) :
        item(li) {}

    void setAlignment(Qt::Alignment al);

    QLayoutItem *item;
    int row = -1;
    int column = -1;
    int rowSpan = 0;
    int columnSpan = 0;
    Qt::Alignment alignment;
};

// filter out the case of "Spacer" and "QLayoutWidget" widgets
void FormBuilderSaveLayoutEntry::setAlignment(Qt::Alignment al)
{
    if (const QWidget *widget = item->widget()) {
        const char *className = widget->metaObject()->className();
        if (qstrcmp(className, "Spacer") && qstrcmp(className, "QLayoutWidget"))
            alignment = al;
    }
}

// Create list from standard box layout
static QList<FormBuilderSaveLayoutEntry> saveLayoutEntries(const QLayout *layout)
{
    QList<FormBuilderSaveLayoutEntry> rc;
    if (const int count = layout->count()) {
        rc.reserve(count);
        for (int idx = 0; idx < count; ++idx) {
            QLayoutItem *item = layout->itemAt(idx);
            FormBuilderSaveLayoutEntry entry(item);
            entry.setAlignment(item->alignment());
            rc.append(entry);
        }
    }
    return rc;
}

// Create list from grid layout
static QList<FormBuilderSaveLayoutEntry> saveGridLayoutEntries(QGridLayout *gridLayout)
{
    QList<FormBuilderSaveLayoutEntry> rc;
    if (const int count = gridLayout->count()) {
        rc.reserve(count);
        for (int idx = 0; idx < count; ++idx) {
            QLayoutItem *item = gridLayout->itemAt(idx);
            FormBuilderSaveLayoutEntry entry(item);
            gridLayout->getItemPosition(idx, &entry.row, &entry.column, &entry.rowSpan,&entry.columnSpan);
            entry.setAlignment(item->alignment());
            rc.append(entry);
        }
    }
    return rc;
}

#if QT_CONFIG(formlayout)
// Create list from form layout
static QList<FormBuilderSaveLayoutEntry> saveFormLayoutEntries(const QFormLayout *formLayout)
{
    QList<FormBuilderSaveLayoutEntry> rc;
    if (const int count = formLayout->count()) {
        rc.reserve(count);
        for (int idx = 0; idx < count; ++idx) {
            QLayoutItem *item = formLayout->itemAt(idx);
            QFormLayout::ItemRole role = QFormLayout::LabelRole;
            FormBuilderSaveLayoutEntry entry(item);
            formLayout->getItemPosition(idx, &entry.row, &role);
            switch (role ) {
            case QFormLayout::LabelRole:
                entry.column = 0;
                break;
            case QFormLayout::FieldRole:
                entry.column = 1;
                break;
            case QFormLayout::SpanningRole:
                entry.column = 0;
                entry.columnSpan = 2;
                break;
            }
            rc.push_back(entry);
        }
    }
    return rc;
}
#endif

/*!
    \internal
*/

DomLayout *QAbstractFormBuilder::createDom(QLayout *layout, DomLayout *ui_layout, DomWidget *ui_parentWidget)
{
    Q_UNUSED(ui_layout);
    DomLayout *lay = new DomLayout();
    lay->setAttributeClass(QLatin1String(layout->metaObject()->className()));
    const QString objectName = layout->objectName();
    if (!objectName.isEmpty())
        lay->setAttributeName(objectName);
    lay->setElementProperty(computeProperties(layout));

    QList<FormBuilderSaveLayoutEntry> newList;
    if (QGridLayout *gridLayout = qobject_cast<QGridLayout *>(layout)) {
        newList = saveGridLayoutEntries(gridLayout);
#if QT_CONFIG(formlayout)
    } else if (const QFormLayout *formLayout = qobject_cast<const QFormLayout *>(layout)) {
        newList = saveFormLayoutEntries(formLayout);
#endif
    } else {
        newList = saveLayoutEntries(layout);
    }

    QList<DomLayoutItem *> ui_items;
    ui_items.reserve(newList.size());
    for (const FormBuilderSaveLayoutEntry &item : qAsConst(newList)) {
        if (DomLayoutItem *ui_item = createDom(item.item, lay, ui_parentWidget)) {
            if (item.row >= 0)
                ui_item->setAttributeRow(item.row);
            if (item.column >= 0)
                ui_item->setAttributeColumn(item.column);
            if (item.rowSpan > 1)
                ui_item->setAttributeRowSpan(item.rowSpan);
            if (item.columnSpan > 1)
                ui_item->setAttributeColSpan(item.columnSpan);
            if (item.alignment)
                ui_item->setAttributeAlignment(alignmentValue(item.alignment));
            ui_items.append(ui_item);
        }
    }

    lay->setElementItem(ui_items);

    return lay;
}

/*!
    \internal
*/
DomLayoutItem *QAbstractFormBuilder::createDom(QLayoutItem *item, DomLayout *ui_layout, DomWidget *ui_parentWidget)
{
    DomLayoutItem *ui_item = new DomLayoutItem();

    if (item->widget())  {
        ui_item->setElementWidget(createDom(item->widget(), ui_parentWidget));
        d->m_laidout.insert(item->widget(), true);
    } else if (item->layout()) {
        ui_item->setElementLayout(createDom(item->layout(), ui_layout, ui_parentWidget));
    } else if (item->spacerItem()) {
        ui_item->setElementSpacer(createDom(item->spacerItem(), ui_layout, ui_parentWidget));
    }

    return ui_item;
}

/*!
    \internal
*/
DomSpacer *QAbstractFormBuilder::createDom(QSpacerItem *spacer, DomLayout *ui_layout, DomWidget *ui_parentWidget)
{
    Q_UNUSED(ui_layout);
    Q_UNUSED(ui_parentWidget);

    DomSpacer *ui_spacer = new DomSpacer();
    QList<DomProperty*> properties;

    DomProperty *prop = nullptr;
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    // sizeHint property
    prop = new DomProperty();
    prop->setAttributeName(strings.sizeHintProperty);
    prop->setElementSize(new DomSize());
    prop->elementSize()->setElementWidth(spacer->sizeHint().width());
    prop->elementSize()->setElementHeight(spacer->sizeHint().height());
    properties.append(prop);

    // orientation property
    prop = new DomProperty(); // ### we don't implemented the case where expandingDirections() is both Vertical and Horizontal
    prop->setAttributeName(strings.orientationProperty);
    prop->setElementEnum((spacer->expandingDirections() & Qt::Horizontal) ? strings.qtHorizontal : strings.qtVertical);
    properties.append(prop);

    ui_spacer->setElementProperty(properties);
    return ui_spacer;
}

/*!
    \internal
*/
DomProperty *QAbstractFormBuilder::createProperty(QObject *obj, const QString &pname, const QVariant &v)
{
    if (!checkProperty(obj, pname)) {
        return nullptr;
    }
    return variantToDomProperty(this, obj->metaObject(), pname, v);
}

/*!
    \internal
*/
QList<DomProperty*> QAbstractFormBuilder::computeProperties(QObject *obj)
{
    QList<DomProperty*> lst;

    const QMetaObject *meta = obj->metaObject();

    QHash<QByteArray, bool> properties;
    const int propertyCount = meta->propertyCount();
    for(int i=0; i < propertyCount; ++i)
        properties.insert(meta->property(i).name(), true);

    const auto propertyNames = properties.keys();

    const int propertyNamesCount = propertyNames.size();
    for(int i=0; i<propertyNamesCount ; ++i) {
        const QString pname = QString::fromUtf8(propertyNames.at(i));
        const QMetaProperty prop = meta->property(meta->indexOfProperty(pname.toUtf8()));

        if (!prop.isWritable() || !checkProperty(obj, QLatin1String(prop.name())))
            continue;

        const QVariant v = prop.read(obj);

        DomProperty *dom_prop = nullptr;
        if (v.metaType().id() == QMetaType::Int) {
            dom_prop = new DomProperty();

            if (prop.isFlagType())
                uiLibWarning(QCoreApplication::translate("QAbstractFormBuilder", "Flags property are not supported yet."));

            if (prop.isEnumType()) {
                QString scope = QString::fromUtf8(prop.enumerator().scope());
                if (scope.size())
                    scope += QString::fromUtf8("::");
                const QString e = QString::fromUtf8(prop.enumerator().valueToKey(v.toInt()));
                if (e.size())
                    dom_prop->setElementEnum(scope + e);
            } else
                dom_prop->setElementNumber(v.toInt());
            dom_prop->setAttributeName(pname);
        } else {
            dom_prop = createProperty(obj, pname, v);
        }

        if (!dom_prop || dom_prop->kind() == DomProperty::Unknown)
            delete dom_prop;
        else
            lst.append(dom_prop);
    }

    return lst;
}


/*!
   \internal
   \typedef QAbstractFormBuilder::DomPropertyHash
   \typedef QAbstractFormBuilder::IconPaths
*/


/*!
    \internal
*/
QAbstractFormBuilder::DomPropertyHash QAbstractFormBuilder::propertyMap(const QList<DomProperty*> &properties)
{
    DomPropertyHash map;

    for (DomProperty *p : properties)
        map.insert(p->attributeName(), p);

    return map;
}

/*!
    \internal
*/
bool QAbstractFormBuilder::checkProperty(QObject *obj, const QString &prop) const
{
    Q_UNUSED(obj);
    Q_UNUSED(prop);

    return true;
}

/*!
    \internal
*/
QString QAbstractFormBuilder::toString(const DomString *str)
{
    return str ? str->text() : QString();
}

/*!
    \internal
*/
void QAbstractFormBuilder::applyTabStops(QWidget *widget, DomTabStops *tabStops)
{
    if (!tabStops)
        return;

    const QStringList &names = tabStops->elementTabStop();
    QWidgetList widgets;
    widgets.reserve(names.size());
    for (const QString &name : names) {
        if (QWidget *child = widget->findChild<QWidget*>(name)) {
            widgets.append(child);
        } else {
            uiLibWarning(QCoreApplication::translate("QAbstractFormBuilder",
                                                     "While applying tab stops: The widget '%1' could not be found.")
                                                     .arg(name));
        }
    }

    for (int i = 1, count = widgets.size(); i < count; ++i)
        QWidget::setTabOrder(widgets.at(i - 1), widgets.at(i));
}

/*!
    \internal
*/
DomCustomWidgets *QAbstractFormBuilder::saveCustomWidgets()
{
    return nullptr;
}

/*!
    \internal
*/
DomTabStops *QAbstractFormBuilder::saveTabStops()
{
    return nullptr;
}

/*!
    \internal
*/
DomResources *QAbstractFormBuilder::saveResources()
{
    return nullptr;
}

/*!
    \internal
    \since 4.5
*/

DomButtonGroups *QAbstractFormBuilder::saveButtonGroups(const QWidget *mainContainer)
{
    // Save fst order buttongroup children of maincontainer
    const QObjectList &mchildren = mainContainer->children();
    if (mchildren.isEmpty())
        return nullptr;
    QList<DomButtonGroup *> domGroups;
    for (QObject *o : mchildren) {
        if (auto bg = qobject_cast<QButtonGroup *>(o))
            if (DomButtonGroup* dg = createDom(bg))
                domGroups.push_back(dg);
    }
    if (domGroups.isEmpty())
        return nullptr;
    DomButtonGroups *rc = new DomButtonGroups;
    rc->setElementButtonGroup(domGroups);
    return rc;
}

// VC6 would not find templated members, so we use statics and this utter hack.
class FriendlyFB : public QAbstractFormBuilder {
public:
    using QAbstractFormBuilder::saveResource;
    using QAbstractFormBuilder::saveText;
    using QAbstractFormBuilder::resourceBuilder;
    using QAbstractFormBuilder::textBuilder;
    using QAbstractFormBuilder::toVariant;
};

template<class T>
static void storeItemFlags(const T *item, QList<DomProperty*> *properties)
{
    static const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    static const Qt::ItemFlags defaultFlags = T().flags();
    static const QMetaEnum itemFlags_enum = metaEnum<QAbstractFormBuilderGadget>("itemFlags");

    if (item->flags() != defaultFlags) {
        DomProperty *p = new DomProperty;
        p->setAttributeName(strings.flagsAttribute);
        p->setElementSet(QString::fromLatin1(itemFlags_enum.valueToKeys(item->flags())));
        properties->append(p);
    }
}

template<class T>
static void storeItemProps(QAbstractFormBuilder *abstractFormBuilder, const T *item,
        QList<DomProperty*> *properties,
        Qt::Alignment defaultAlign = Qt::AlignLeading | Qt::AlignVCenter)
{
    static const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    FriendlyFB * const formBuilder = static_cast<FriendlyFB *>(abstractFormBuilder);

    DomProperty *p;

    for (const QFormBuilderStrings::TextRoleNName &it : strings.itemTextRoles)
        if ((p = formBuilder->saveText(it.second, item->data(it.first.second))))
            properties->append(p);

    auto *mo = static_cast<const QMetaObject *>(&QAbstractFormBuilderGadget::staticMetaObject);
    for (const QFormBuilderStrings::RoleNName &it : strings.itemRoles) {
        const QVariant v = item->data(it.first);
        const bool isModified = v.isValid()
            && (it.first != Qt::TextAlignmentRole || v.toUInt() != uint(defaultAlign));
        if (isModified &&
            (p = variantToDomProperty(abstractFormBuilder, mo, it.second, v))) {
            properties->append(p);
        }
    }

    if ((p = formBuilder->saveResource(item->data(Qt::DecorationPropertyRole))))
        properties->append(p);
}

template<class T>
static void storeItemPropsNFlags(QAbstractFormBuilder *abstractFormBuilder, const T *item,
        QList<DomProperty*> *properties)
{
    storeItemProps<T>(abstractFormBuilder, item, properties);
    storeItemFlags<T>(item, properties);
}

template<class T>
static void loadItemProps(QAbstractFormBuilder *abstractFormBuilder, T *item,
        const QHash<QString, DomProperty*> &properties)
{
    static const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    FriendlyFB * const formBuilder = static_cast<FriendlyFB *>(abstractFormBuilder);

    DomProperty *p;
    QVariant v;

    for (const QFormBuilderStrings::TextRoleNName &it : strings.itemTextRoles)
        if ((p = properties.value(it.second))) {
            v = formBuilder->textBuilder()->loadText(p);
            QVariant nativeValue = formBuilder->textBuilder()->toNativeValue(v);
            item->setData(it.first.first, qvariant_cast<QString>(nativeValue));
            item->setData(it.first.second, v);
        }

    for (const QFormBuilderStrings::RoleNName &it : strings.itemRoles)
        if ((p = properties.value(it.second)) &&
            (v = formBuilder->toVariant(&QAbstractFormBuilderGadget::staticMetaObject, p)).isValid())
            item->setData(it.first, v);

    if ((p = properties.value(strings.iconAttribute))) {
        v = formBuilder->resourceBuilder()->loadResource(formBuilder->workingDirectory(), p);
        QVariant nativeValue = formBuilder->resourceBuilder()->toNativeValue(v);
        item->setIcon(qvariant_cast<QIcon>(nativeValue));
        item->setData(Qt::DecorationPropertyRole, v);
    }
}

template<class T>
static void loadItemPropsNFlags(QAbstractFormBuilder *abstractFormBuilder, T *item,
        const QHash<QString, DomProperty*> &properties)
{
    static const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    static const QMetaEnum itemFlags_enum = metaEnum<QAbstractFormBuilderGadget>("itemFlags");

    loadItemProps<T>(abstractFormBuilder, item, properties);

    DomProperty *p;
    if ((p = properties.value(strings.flagsAttribute)) && p->kind() == DomProperty::Set)
        item->setFlags(enumKeysToValue<Qt::ItemFlags>(itemFlags_enum, p->elementSet().toLatin1()));
}

/*!
    \internal
*/
void QAbstractFormBuilder::saveTreeWidgetExtraInfo(QTreeWidget *treeWidget, DomWidget *ui_widget, DomWidget *ui_parentWidget)
{
    Q_UNUSED(ui_parentWidget);

    QList<DomColumn *> columns;
    DomProperty *p;
    QVariant v;
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    // save the header
    for (int c = 0; c<treeWidget->columnCount(); ++c) {
        DomColumn *column = new DomColumn;

        QList<DomProperty*> properties;

        for (const QFormBuilderStrings::TextRoleNName &it : strings.itemTextRoles) {
            p = saveText(it.second, treeWidget->headerItem()->data(c, it.first.second));
            // Prevent uic 4.4.X from crashing if it cannot find a column text
            if (!p && it.first.first == Qt::EditRole && it.second == QStringLiteral("text")) {
                DomString *defaultHeader = new DomString;
                defaultHeader->setText(QString::number(c + 1));
                defaultHeader->setAttributeNotr(QStringLiteral("true"));
                p = new DomProperty;
                p->setAttributeName(it.second);
                p->setElementString(defaultHeader);
            }
            if (p)
                properties.append(p);
        }

        for (const QFormBuilderStrings::RoleNName &it : strings.itemRoles)
            if ((v = treeWidget->headerItem()->data(c, it.first)).isValid() &&
                (p = variantToDomProperty(this, &QAbstractFormBuilderGadget::staticMetaObject, it.second, v)))
                properties.append(p);

        if ((p = saveResource(treeWidget->headerItem()->data(c, Qt::DecorationPropertyRole))))
            properties.append(p);

        column->setElementProperty(properties);
        columns.append(column);
    }

    ui_widget->setElementColumn(columns);

    auto items = ui_widget->elementItem();

    QQueue<QPair<QTreeWidgetItem *, DomItem *> > pendingQueue;
    for (int i = 0; i < treeWidget->topLevelItemCount(); i++)
        pendingQueue.enqueue(qMakePair(treeWidget->topLevelItem(i), nullptr));

    while (!pendingQueue.isEmpty()) {
        const QPair<QTreeWidgetItem *, DomItem *> pair = pendingQueue.dequeue();
        QTreeWidgetItem *item = pair.first;
        DomItem *parentDomItem = pair.second;

        DomItem *currentDomItem = new DomItem;

        QList<DomProperty*> properties;
        for (int c = 0; c < treeWidget->columnCount(); c++) {
            for (const QFormBuilderStrings::TextRoleNName &it : strings.itemTextRoles)
                if ((p = saveText(it.second, item->data(c, it.first.second))))
                    properties.append(p);

            for (const QFormBuilderStrings::RoleNName &it : strings.itemRoles)
                if ((v = item->data(c, it.first)).isValid() &&
                    (p = variantToDomProperty(this, &QAbstractFormBuilderGadget::staticMetaObject, it.second, v)))
                    properties.append(p);

            if ((p = saveResource(item->data(c, Qt::DecorationPropertyRole))))
                properties.append(p);
        }
        storeItemFlags(item, &properties);
        currentDomItem->setElementProperty(properties);

        if (parentDomItem) {
            auto childrenItems = parentDomItem->elementItem();
            childrenItems.append(currentDomItem);
            parentDomItem->setElementItem(childrenItems);
        } else
            items.append(currentDomItem);

        for (int i = 0; i < item->childCount(); i++)
            pendingQueue.enqueue(qMakePair(item->child(i), currentDomItem));
    }

    ui_widget->setElementItem(items);
}

/*!
    \internal
*/
void QAbstractFormBuilder::saveTableWidgetExtraInfo(QTableWidget *tableWidget, DomWidget *ui_widget, DomWidget *ui_parentWidget)
{
    Q_UNUSED(ui_parentWidget);

    // save the horizontal header
    QList<DomColumn *> columns;
    auto *header = tableWidget->horizontalHeader();
    for (int c = 0; c < tableWidget->columnCount(); c++) {
        QList<DomProperty*> properties;
        QTableWidgetItem *item = tableWidget->horizontalHeaderItem(c);
        if (item)
            storeItemProps(this, item, &properties, header->defaultAlignment());

        DomColumn *column = new DomColumn;
        column->setElementProperty(properties);
        columns.append(column);
    }
    ui_widget->setElementColumn(columns);

    // save the vertical header
    QList<DomRow *> rows;
    header = tableWidget->verticalHeader();
    for (int r = 0; r < tableWidget->rowCount(); r++) {
        QList<DomProperty*> properties;
        QTableWidgetItem *item = tableWidget->verticalHeaderItem(r);
        if (item)
            storeItemProps(this, item, &properties, header->defaultAlignment());

        DomRow *row = new DomRow;
        row->setElementProperty(properties);
        rows.append(row);
    }
    ui_widget->setElementRow(rows);

    auto items = ui_widget->elementItem();
    for (int r = 0; r < tableWidget->rowCount(); r++)
        for (int c = 0; c < tableWidget->columnCount(); c++) {
            QTableWidgetItem *item = tableWidget->item(r, c);
            if (item) {
                QList<DomProperty*> properties;
                storeItemPropsNFlags(this, item, &properties);

                DomItem *domItem = new DomItem;
                domItem->setAttributeRow(r);
                domItem->setAttributeColumn(c);
                domItem->setElementProperty(properties);
                items.append(domItem);
            }
        }

    ui_widget->setElementItem(items);
}

/*!
    \internal
*/
void QAbstractFormBuilder::saveListWidgetExtraInfo(QListWidget *listWidget, DomWidget *ui_widget, DomWidget *ui_parentWidget)
{
    Q_UNUSED(ui_parentWidget);

    auto ui_items = ui_widget->elementItem();
    for (int i=0; i<listWidget->count(); ++i) {
        QList<DomProperty*> properties;
        storeItemPropsNFlags(this, listWidget->item(i), &properties);

        DomItem *ui_item = new DomItem();
        ui_item->setElementProperty(properties);
        ui_items.append(ui_item);
    }

    ui_widget->setElementItem(ui_items);
}

/*!
    \internal
*/
void QAbstractFormBuilder::saveComboBoxExtraInfo(QComboBox *comboBox, DomWidget *ui_widget, DomWidget *ui_parentWidget)
{
    Q_UNUSED(ui_parentWidget);
    auto ui_items = ui_widget->elementItem();

    const int count = comboBox->count();
    for (int i=0; i < count; ++i) {
        // We might encounter items for which both builders return 0 in Designer
        // (indicating a custom combo adding items in the constructor). Ignore those.
        DomProperty *textProperty = saveText(QFormBuilderStrings::instance().textAttribute,
                                             comboBox->itemData(i, Qt::DisplayPropertyRole));
        DomProperty *iconProperty = saveResource(comboBox->itemData(i, Qt::DecorationPropertyRole));
        if (textProperty || iconProperty) {
            QList<DomProperty*> properties;
            if (textProperty)
                properties.push_back(textProperty);
            if (iconProperty)
                properties.push_back(iconProperty);

            DomItem *ui_item = new DomItem();
            ui_item->setElementProperty(properties);
            ui_items.push_back(ui_item);
        }
    }

    ui_widget->setElementItem(ui_items);
}

/*!
    \internal
    \since 4.5
*/

void QAbstractFormBuilder::saveButtonExtraInfo(const QAbstractButton *widget, DomWidget *ui_widget, DomWidget *)
{
    using DomPropertyList = QList<DomProperty *>;
    if (const QButtonGroup *buttonGroup = widget->group()) {
        DomPropertyList attributes = ui_widget->elementAttribute();
        DomString *domString = new DomString();
        domString->setText(buttonGroup->objectName());
        domString->setAttributeNotr(QStringLiteral("true"));
        DomProperty *domProperty = new DomProperty();
        domProperty->setAttributeName(QLatin1String(buttonGroupPropertyC));
        domProperty->setElementString(domString);
        attributes += domProperty;
        ui_widget->setElementAttribute(attributes);
    }
}

/*!
    \internal
    \since 4.5
*/
void QAbstractFormBuilder::saveItemViewExtraInfo(const QAbstractItemView *itemView,
                                                 DomWidget *ui_widget, DomWidget *)
{
    //
    // Special handling for qtableview/qtreeview fake header attributes
    //
    static const QLatin1String realPropertyNames[] = {
        QLatin1String("visible"),
        QLatin1String("cascadingSectionResizes"),
        QLatin1String("minimumSectionSize"),    // before defaultSectionSize
        QLatin1String("defaultSectionSize"),
        QLatin1String("highlightSections"),
        QLatin1String("showSortIndicator"),
        QLatin1String("stretchLastSection"),
    };

    if (const QTreeView *treeView = qobject_cast<const QTreeView*>(itemView)) {
        auto viewProperties = ui_widget->elementAttribute();
        const auto &headerProperties = computeProperties(treeView->header());
        for (QString realPropertyName : realPropertyNames) {
            const QString upperPropertyName = realPropertyName.at(0).toUpper()
                                              + realPropertyName.mid(1);
            const QString fakePropertyName = QStringLiteral("header") + upperPropertyName;
            for (DomProperty *property : headerProperties) {
                if (property->attributeName() == realPropertyName) {
                    property->setAttributeName(fakePropertyName);
                    viewProperties << property;
                }
            }
        }
        ui_widget->setElementAttribute(viewProperties);
    } else if (const QTableView *tableView = qobject_cast<const QTableView*>(itemView)) {
        static const QStringList headerPrefixes =
                (QStringList() << QStringLiteral("horizontalHeader")
                               << QStringLiteral("verticalHeader"));

        auto viewProperties = ui_widget->elementAttribute();
        for (const QString &headerPrefix : headerPrefixes) {
            const auto &headerProperties = headerPrefix == QStringLiteral("horizontalHeader")
                ? computeProperties(tableView->horizontalHeader())
                : computeProperties(tableView->verticalHeader());
            for (QString realPropertyName : realPropertyNames) {
                const QString upperPropertyName = realPropertyName.at(0).toUpper()
                                                  + realPropertyName.mid(1);
                const QString fakePropertyName = headerPrefix + upperPropertyName;
                for (DomProperty *property : qAsConst(headerProperties)) {
                    if (property->attributeName() == realPropertyName) {
                        property->setAttributeName(fakePropertyName);
                        viewProperties << property;
                    }
                }
            }
        }
        ui_widget->setElementAttribute(viewProperties);
    }
}

/*!
    \internal
    \since 4.4
*/

void QAbstractFormBuilder::setResourceBuilder(QResourceBuilder *builder)
{
    d->setResourceBuilder(builder);
}

/*!
    \internal
    \since 4.4
*/

QResourceBuilder *QAbstractFormBuilder::resourceBuilder() const
{
    return d->resourceBuilder();
}

/*!
    \internal
    \since 4.5
*/

void QAbstractFormBuilder::setTextBuilder(QTextBuilder *builder)
{
    d->setTextBuilder(builder);
}

/*!
    \internal
    \since 4.5
*/

QTextBuilder *QAbstractFormBuilder::textBuilder() const
{
    return d->textBuilder();
}

/*!
    \internal
*/
void QAbstractFormBuilder::saveExtraInfo(QWidget *widget, DomWidget *ui_widget,
                                         DomWidget *ui_parentWidget)
{
    if (QListWidget *listWidget = qobject_cast<QListWidget*>(widget)) {
        saveListWidgetExtraInfo(listWidget, ui_widget, ui_parentWidget);
    } else if (QTreeWidget *treeWidget = qobject_cast<QTreeWidget*>(widget)) {
        saveTreeWidgetExtraInfo(treeWidget, ui_widget, ui_parentWidget);
    } else if (QTableWidget *tableWidget = qobject_cast<QTableWidget*>(widget)) {
        saveTableWidgetExtraInfo(tableWidget, ui_widget, ui_parentWidget);
    } else if (QComboBox *comboBox = qobject_cast<QComboBox*>(widget)) {
        if (!qobject_cast<QFontComboBox*>(widget))
            saveComboBoxExtraInfo(comboBox, ui_widget, ui_parentWidget);
    } else if(QAbstractButton *ab = qobject_cast<QAbstractButton *>(widget)) {
        saveButtonExtraInfo(ab, ui_widget, ui_parentWidget);
    }
    if (QAbstractItemView *itemView = qobject_cast<QAbstractItemView *>(widget)) {
        saveItemViewExtraInfo(itemView, ui_widget, ui_parentWidget);
    }
}

/*!
    \internal
*/
void QAbstractFormBuilder::loadListWidgetExtraInfo(DomWidget *ui_widget, QListWidget *listWidget, QWidget *parentWidget)
{
    Q_UNUSED(parentWidget);
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();

    const auto &elementItem = ui_widget->elementItem();
    for (DomItem *ui_item : elementItem) {
        const DomPropertyHash properties = propertyMap(ui_item->elementProperty());
        QListWidgetItem *item = new QListWidgetItem(listWidget);
        loadItemPropsNFlags<QListWidgetItem>(this, item, properties);
    }

    DomProperty *currentRow = propertyMap(ui_widget->elementProperty()).value(strings.currentRowProperty);
    if (currentRow)
        listWidget->setCurrentRow(currentRow->elementNumber());
}

/*!
    \internal
*/
void QAbstractFormBuilder::loadTreeWidgetExtraInfo(DomWidget *ui_widget, QTreeWidget *treeWidget, QWidget *parentWidget)
{
    Q_UNUSED(parentWidget);
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    const QMetaEnum itemFlags_enum = metaEnum<QAbstractFormBuilderGadget>("itemFlags");
    const auto &columns = ui_widget->elementColumn();
    if (!columns.isEmpty())
        treeWidget->setColumnCount(columns.size());

    for (qsizetype i = 0, size = columns.size(); i < size; ++i) {
        const DomColumn *c = columns.at(i);
        const DomPropertyHash properties = propertyMap(c->elementProperty());

        DomProperty *p;
        QVariant v;

        for (const QFormBuilderStrings::RoleNName &it : strings.itemRoles)
            if ((p = properties.value(it.second)) &&
                (v = toVariant(&QAbstractFormBuilderGadget::staticMetaObject, p)).isValid())
                treeWidget->headerItem()->setData(i, it.first, v);

        for (const QFormBuilderStrings::TextRoleNName &it : strings.itemTextRoles)
            if ((p = properties.value(it.second))) {
                v = textBuilder()->loadText(p);
                QVariant nativeValue = textBuilder()->toNativeValue(v);
                treeWidget->headerItem()->setData(i, it.first.first, qvariant_cast<QString>(nativeValue));
                treeWidget->headerItem()->setData(i, it.first.second, v);
            }

        if ((p = properties.value(strings.iconAttribute))) {
            v = resourceBuilder()->loadResource(workingDirectory(), p);
            QVariant nativeValue = resourceBuilder()->toNativeValue(v);
            treeWidget->headerItem()->setIcon(i, qvariant_cast<QIcon>(nativeValue));
            treeWidget->headerItem()->setData(i, Qt::DecorationPropertyRole, v);
        }
    }

    QQueue<QPair<DomItem *, QTreeWidgetItem *> > pendingQueue;
    const auto &widgetElementItem = ui_widget->elementItem();
    for (DomItem *ui_item : widgetElementItem)
        pendingQueue.enqueue(qMakePair(ui_item, nullptr));

    while (!pendingQueue.isEmpty()) {
        const QPair<DomItem *, QTreeWidgetItem *> pair = pendingQueue.dequeue();
        const DomItem *domItem = pair.first;
        QTreeWidgetItem *parentItem = pair.second;

        QTreeWidgetItem *currentItem = nullptr;

        if (parentItem)
            currentItem = new QTreeWidgetItem(parentItem);
        else
            currentItem = new QTreeWidgetItem(treeWidget);

        const auto &properties = domItem->elementProperty();
        int col = -1;
        for (DomProperty *property : properties) {
            if (property->attributeName() == strings.flagsAttribute && !property->elementSet().isEmpty()) {
                currentItem->setFlags(enumKeysToValue<Qt::ItemFlags>(itemFlags_enum, property->elementSet().toLatin1()));
            } else if (property->attributeName() == strings.textAttribute && property->elementString()) {
                col++;
                QVariant textV = textBuilder()->loadText(property);
                QVariant nativeValue = textBuilder()->toNativeValue(textV);
                currentItem->setText(col, qvariant_cast<QString>(nativeValue));
                currentItem->setData(col, Qt::DisplayPropertyRole, textV);
            } else if (col >= 0) {
                if (property->attributeName() == strings.iconAttribute) {
                    QVariant v = resourceBuilder()->loadResource(workingDirectory(), property);
                    if (v.isValid()) {
                        QVariant nativeValue = resourceBuilder()->toNativeValue(v);
                        currentItem->setIcon(col, qvariant_cast<QIcon>(nativeValue));
                        currentItem->setData(col, Qt::DecorationPropertyRole, v);
                    }
                } else {
                    QVariant v;
                    int role = strings.treeItemRoleHash.value(property->attributeName(), (Qt::ItemDataRole)-1);
                    if (role >= 0) {
                        if ((v = toVariant(&QAbstractFormBuilderGadget::staticMetaObject, property)).isValid())
                            currentItem->setData(col, role, v);
                    } else {
                        QPair<Qt::ItemDataRole, Qt::ItemDataRole> rolePair =
                            strings.treeItemTextRoleHash.value(property->attributeName(),
                                         qMakePair((Qt::ItemDataRole)-1, (Qt::ItemDataRole)-1));
                        if (rolePair.first >= 0) {
                            QVariant textV = textBuilder()->loadText(property);
                            QVariant nativeValue = textBuilder()->toNativeValue(textV);
                            currentItem->setData(col, rolePair.first, qvariant_cast<QString>(nativeValue));
                            currentItem->setData(col, rolePair.second, textV);
                        }
                    }
                }
            }
        }

        const auto &elementItem = domItem->elementItem();
        for (DomItem *childItem : elementItem)
            pendingQueue.enqueue(qMakePair(childItem, currentItem));

    }
}

/*!
    \internal
*/
void QAbstractFormBuilder::loadTableWidgetExtraInfo(DomWidget *ui_widget, QTableWidget *tableWidget, QWidget *parentWidget)
{
    Q_UNUSED(parentWidget);

    const auto &columns = ui_widget->elementColumn();
    if (!columns.isEmpty())
        tableWidget->setColumnCount(columns.size());
    for (qsizetype i = 0, size = columns.size(); i < size; ++i) {
        DomColumn *c = columns.at(i);
        const DomPropertyHash properties = propertyMap(c->elementProperty());

        if (!properties.isEmpty()) {
            QTableWidgetItem *item = new QTableWidgetItem;
            loadItemProps(this, item, properties);
            tableWidget->setHorizontalHeaderItem(i, item);
        }
    }

    const auto &rows = ui_widget->elementRow();
    if (!rows.isEmpty())
        tableWidget->setRowCount(rows.size());
    for (qsizetype i = 0, size = rows.size(); i < size; ++i) {
        const DomRow *r = rows.at(i);
        const DomPropertyHash properties = propertyMap(r->elementProperty());

        if (!properties.isEmpty()) {
            QTableWidgetItem *item = new QTableWidgetItem;
            loadItemProps(this, item, properties);
            tableWidget->setVerticalHeaderItem(i, item);
        }
    }

    const auto &elementItem = ui_widget->elementItem();
    for (DomItem *ui_item : elementItem) {
        if (ui_item->hasAttributeRow() && ui_item->hasAttributeColumn()) {
            const DomPropertyHash properties = propertyMap(ui_item->elementProperty());
            QTableWidgetItem *item = new QTableWidgetItem;
            loadItemPropsNFlags(this, item, properties);
            tableWidget->setItem(ui_item->attributeRow(), ui_item->attributeColumn(), item);
        }
    }
}

/*!
    \internal
*/
void QAbstractFormBuilder::loadComboBoxExtraInfo(DomWidget *ui_widget, QComboBox *comboBox, QWidget *parentWidget)
{
    Q_UNUSED(parentWidget);
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    const auto &elementItem = ui_widget->elementItem();
    for (DomItem *ui_item : elementItem) {
        const DomPropertyHash properties = propertyMap(ui_item->elementProperty());
        QString text;
        QIcon icon;
        QVariant textData;
        QVariant iconData;

        DomProperty *p = nullptr;

        p = properties.value(strings.textAttribute);
        if (p && p->elementString()) {
             textData = textBuilder()->loadText(p);
             text = qvariant_cast<QString>(textBuilder()->toNativeValue(textData));
        }

        p = properties.value(strings.iconAttribute);
        if (p) {
             iconData = resourceBuilder()->loadResource(workingDirectory(), p);
             icon = qvariant_cast<QIcon>(resourceBuilder()->toNativeValue(iconData));
        }

        comboBox->addItem(icon, text);
        comboBox->setItemData((comboBox->count()-1), iconData, Qt::DecorationPropertyRole);
        comboBox->setItemData((comboBox->count()-1), textData, Qt::DisplayPropertyRole);
    }

    DomProperty *currentIndex = propertyMap(ui_widget->elementProperty()).value(strings.currentIndexProperty);
    if (currentIndex)
        comboBox->setCurrentIndex(currentIndex->elementNumber());
}

// Get the button group name out of a widget's attribute list
static QString buttonGroupName(const DomWidget *ui_widget)
{
    const auto &attributes = ui_widget->elementAttribute();
    if (attributes.isEmpty())
        return QString();
    const QString buttonGroupProperty = QLatin1String(buttonGroupPropertyC);
    for (const DomProperty *p : attributes) {
        if (p->attributeName() == buttonGroupProperty)
            return p->elementString()->text();
    }
    return QString();
}

/*!
    \internal
    \since 4.5
*/

void QAbstractFormBuilder::loadButtonExtraInfo(const DomWidget *ui_widget, QAbstractButton *button, QWidget *)
{
    using ButtonGroupHash = QFormBuilderExtra::ButtonGroupHash;

    const QString groupName = buttonGroupName(ui_widget);
    if (groupName.isEmpty())
        return;
    // Find entry
    ButtonGroupHash &buttonGroups = d->buttonGroups();
    ButtonGroupHash::iterator it = buttonGroups.find(groupName);
    if (it == buttonGroups.end()) {
#ifdef QFORMINTERNAL_NAMESPACE // Suppress the warning when copying in Designer
        uiLibWarning(QCoreApplication::translate("QAbstractFormBuilder", "Invalid QButtonGroup reference '%1' referenced by '%2'.").arg(groupName, button->objectName()));
#endif
        return;
    }
    // Create button group on demand?
    QButtonGroup *&group = it.value().second;
    if (group == nullptr) {
        group = new QButtonGroup;
        group->setObjectName(groupName);
        applyProperties(group,  it.value().first->elementProperty());
    }
    group->addButton(button);
}

/*!
    \internal
    \since 4.5
*/
void QAbstractFormBuilder::loadItemViewExtraInfo(DomWidget *ui_widget, QAbstractItemView *itemView,
                                                 QWidget *)
{
    //
    // Special handling for qtableview/qtreeview fake header attributes
    //
    static const QLatin1String realPropertyNames[] = {
        QLatin1String("visible"),
        QLatin1String("cascadingSectionResizes"),
        QLatin1String("minimumSectionSize"),    // before defaultSectionSize
        QLatin1String("defaultSectionSize"),
        QLatin1String("highlightSections"),
        QLatin1String("showSortIndicator"),
        QLatin1String("stretchLastSection"),
    };

    if (QTreeView *treeView = qobject_cast<QTreeView*>(itemView)) {
        const auto &allAttributes = ui_widget->elementAttribute();
        QList<DomProperty *> headerProperties;
        for (QString realPropertyName : realPropertyNames) {
            const QString upperPropertyName = realPropertyName.at(0).toUpper()
                                              + realPropertyName.mid(1);
            const QString fakePropertyName = QStringLiteral("header") + upperPropertyName;
            for (DomProperty *attr : allAttributes) {
                if (attr->attributeName() == fakePropertyName) {
                    attr->setAttributeName(realPropertyName);
                    headerProperties << attr;
                }
            }
        }
        applyProperties(treeView->header(), headerProperties);
    } else if (QTableView *tableView = qobject_cast<QTableView*>(itemView)) {
        static const QStringList headerPrefixes =
                (QStringList() << QStringLiteral("horizontalHeader")
                               << QStringLiteral("verticalHeader"));

        const auto &allAttributes = ui_widget->elementAttribute();
        for (const QString &headerPrefix : headerPrefixes) {
            QList<DomProperty*> headerProperties;
            for (QString realPropertyName : realPropertyNames) {
                const QString upperPropertyName = realPropertyName.at(0).toUpper()
                                                  + realPropertyName.mid(1);
                const QString fakePropertyName = headerPrefix + upperPropertyName;
                for (DomProperty *attr : allAttributes) {
                    if (attr->attributeName() == fakePropertyName) {
                        attr->setAttributeName(realPropertyName);
                        headerProperties << attr;
                    }
                }
            }
            if (headerPrefix == QStringLiteral("horizontalHeader"))
                applyProperties(tableView->horizontalHeader(), headerProperties);
            else
                applyProperties(tableView->verticalHeader(), headerProperties);
        }
    }
}

/*!
    \internal
*/
void QAbstractFormBuilder::loadExtraInfo(DomWidget *ui_widget, QWidget *widget, QWidget *parentWidget)
{
    const QFormBuilderStrings &strings = QFormBuilderStrings::instance();
    if (false) {
#if QT_CONFIG(listwidget)
    } else if (QListWidget *listWidget = qobject_cast<QListWidget*>(widget)) {
        loadListWidgetExtraInfo(ui_widget, listWidget, parentWidget);
#endif
#if QT_CONFIG(treewidget)
    } else if (QTreeWidget *treeWidget = qobject_cast<QTreeWidget*>(widget)) {
        loadTreeWidgetExtraInfo(ui_widget, treeWidget, parentWidget);
#endif
#if QT_CONFIG(tablewidget)
    } else if (QTableWidget *tableWidget = qobject_cast<QTableWidget*>(widget)) {
        loadTableWidgetExtraInfo(ui_widget, tableWidget, parentWidget);
#endif
#if QT_CONFIG(combobox)
    } else if (QComboBox *comboBox = qobject_cast<QComboBox*>(widget)) {
        if (!qobject_cast<QFontComboBox *>(widget))
            loadComboBoxExtraInfo(ui_widget, comboBox, parentWidget);
#endif
#if QT_CONFIG(tabwidget)
    } else if (QTabWidget *tabWidget = qobject_cast<QTabWidget*>(widget)) {
        const DomProperty *currentIndex = propertyMap(ui_widget->elementProperty()).value(strings.currentIndexProperty);
        if (currentIndex)
            tabWidget->setCurrentIndex(currentIndex->elementNumber());
#endif
#if QT_CONFIG(stackedwidget)
    } else if (QStackedWidget *stackedWidget = qobject_cast<QStackedWidget*>(widget)) {
        const DomProperty *currentIndex = propertyMap(ui_widget->elementProperty()).value(strings.currentIndexProperty);
        if (currentIndex)
            stackedWidget->setCurrentIndex(currentIndex->elementNumber());
#endif
#if QT_CONFIG(toolbox)
    } else if (QToolBox *toolBox = qobject_cast<QToolBox*>(widget)) {
        const DomProperty *currentIndex = propertyMap(ui_widget->elementProperty()).value(strings.currentIndexProperty);
        if (currentIndex)
            toolBox->setCurrentIndex(currentIndex->elementNumber());
        const DomProperty *tabSpacing = propertyMap(ui_widget->elementProperty()).value(strings.tabSpacingProperty);
        if (tabSpacing)
            toolBox->layout()->setSpacing(tabSpacing->elementNumber());
#endif
    } else if (QAbstractButton *ab = qobject_cast<QAbstractButton *>(widget)) {
        loadButtonExtraInfo(ui_widget, ab, parentWidget);
    }
    if (QAbstractItemView *itemView = qobject_cast<QAbstractItemView *>(widget)) {
        loadItemViewExtraInfo(ui_widget, itemView, parentWidget);
    }
}

/*!
    Returns the current working directory of the form builder.

    \sa setWorkingDirectory()
*/
QDir QAbstractFormBuilder::workingDirectory() const
{
    return d->m_workingDirectory;
}

/*!
    Sets the current working directory of the form builder to the
    specified \a directory.

    \sa workingDirectory()
*/
void QAbstractFormBuilder::setWorkingDirectory(const QDir &directory)
{
    d->m_workingDirectory = directory;
}

/*!
    \internal
*/
DomAction *QAbstractFormBuilder::createDom(QAction *action)
{
    if (action->parentWidget() == action->menu() || action->isSeparator())
        return nullptr;

    DomAction *ui_action = new DomAction;
    ui_action->setAttributeName(action->objectName());

    ui_action->setElementProperty(computeProperties(action));

    return ui_action;
}

/*!
    \internal
    \since 4.5
*/

DomButtonGroup *QAbstractFormBuilder::createDom(QButtonGroup *buttonGroup)
{
    if (buttonGroup->buttons().isEmpty()) // Empty group left over on form?
        return nullptr;
    DomButtonGroup *domButtonGroup = new DomButtonGroup;
    domButtonGroup->setAttributeName(buttonGroup->objectName());

    domButtonGroup->setElementProperty(computeProperties(buttonGroup));
    return domButtonGroup;
}

/*!
    \internal
*/
DomActionGroup *QAbstractFormBuilder::createDom(QActionGroup *actionGroup)
{
    DomActionGroup *ui_action_group = new DomActionGroup;
    ui_action_group->setAttributeName(actionGroup->objectName());

    ui_action_group->setElementProperty(computeProperties(actionGroup));

    QList<DomAction *> ui_actions;

    const auto &actions = actionGroup->actions();
    ui_actions.reserve(actions.size());
    for (QAction *action : actions) {
        if (DomAction *ui_action = createDom(action)) {
            ui_actions.append(ui_action);
        }
    }

    ui_action_group->setElementAction(ui_actions);

    return ui_action_group;
}

/*!
    \internal
*/
void QAbstractFormBuilder::addMenuAction(QAction *action)
{
    Q_UNUSED(action);
}

/*!
    \internal
*/
void QAbstractFormBuilder::reset()
{
    d->m_laidout.clear();
    d->m_actions.clear();
    d->m_actionGroups.clear();
    d->m_defaultMargin = INT_MIN;
    d->m_defaultSpacing = INT_MIN;
}

/*!
    \internal
    Access meta enumeration for Qt::ToolBarArea
*/

QMetaEnum QAbstractFormBuilder::toolBarAreaMetaEnum()
{
    return metaEnum<QAbstractFormBuilderGadget>("toolBarArea");
}

/*!
    \internal
    Set up a DOM property with icon.
*/

void QAbstractFormBuilder::setIconProperty(DomProperty &p, const IconPaths &ip) const
{
    DomResourceIcon *dpi = new DomResourceIcon;

 /* TODO
    if (!ip.second.isEmpty())
        pix->setAttributeResource(ip.second);
*/
    dpi->setText(ip.first);

    p.setAttributeName(QFormBuilderStrings::instance().iconAttribute);
    p.setElementIconSet(dpi);
}

/*!
    \internal
    Set up a DOM property with pixmap.
*/

void QAbstractFormBuilder::setPixmapProperty(DomProperty &p, const IconPaths &ip) const
{
    QFormBuilderExtra::setPixmapProperty(&p, ip);
}

/*!
    \internal
    \since 4.4
*/

DomProperty *QAbstractFormBuilder::saveResource(const QVariant &v) const
{
    if (v.isNull())
        return nullptr;

    DomProperty *p = resourceBuilder()->saveResource(workingDirectory(), v);
    if (p)
        p->setAttributeName(QFormBuilderStrings::instance().iconAttribute);
    return p;
}

/*!
    \internal
    \since 4.5
*/

DomProperty *QAbstractFormBuilder::saveText(const QString &attributeName, const QVariant &v) const
{
    if (v.isNull())
        return nullptr;

    DomProperty *p = textBuilder()->saveText(v);
    if (p)
        p->setAttributeName(attributeName);
    return p;
}

/*!
    \internal
    Return the appropriate DOM pixmap for an image dom property.
    From 4.4 - unused
*/

const DomResourcePixmap *QAbstractFormBuilder::domPixmap(const DomProperty* p) {
    switch (p->kind()) {
    case DomProperty::IconSet:
        qDebug() << "** WARNING QAbstractFormBuilder::domPixmap() called for icon set!";
        break;
    case DomProperty::Pixmap:
        return p->elementPixmap();
    default:
        break;
    }
    return nullptr;
}

/*!
    \fn void QAbstractFormBuilder::createConnections ( DomConnections *, QWidget * )
    \internal
*/

/*!
    \fn void QAbstractFormBuilder::createCustomWidgets ( DomCustomWidgets * )
    \internal
*/

/*!
    \fn void QAbstractFormBuilder::createResources ( DomResources * )
    \internal
*/

/*!
    Returns a human-readable description of the last error occurred in load().

    \since 5.0
    \sa load()
*/

QString QAbstractFormBuilder::errorString() const
{
    return d->m_errorString;
}

QT_END_NAMESPACE
