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diff --git a/src/gui/graphicsview/qgraphicsproxywidget.cpp b/src/gui/graphicsview/qgraphicsproxywidget.cpp new file mode 100644 index 0000000..1bd2e21 --- /dev/null +++ b/src/gui/graphicsview/qgraphicsproxywidget.cpp @@ -0,0 +1,1496 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qglobal.h" + +#ifndef QT_NO_GRAPHICSVIEW + +#include "qgraphicslayout.h" +#include "qgraphicsproxywidget.h" +#include "private/qgraphicsproxywidget_p.h" +#include "private/qwidget_p.h" +#include "private/qapplication_p.h" + +#include <QtCore/qdebug.h> +#include <QtGui/qevent.h> +#include <QtGui/qgraphicsscene.h> +#include <QtGui/qgraphicssceneevent.h> +#include <QtGui/qlayout.h> +#include <QtGui/qpainter.h> +#include <QtGui/qstyleoption.h> +#include <QtGui/qgraphicsview.h> + +QT_BEGIN_NAMESPACE + +//#define GRAPHICSPROXYWIDGET_DEBUG + +/*! + \class QGraphicsProxyWidget + \brief The QGraphicsProxyWidget class provides a proxy layer for embedding + a QWidget in a QGraphicsScene. + \since 4.4 + \ingroup multimedia + \ingroup graphicsview-api + + QGraphicsProxyWidget embeds QWidget-based widgets, for example, a + QPushButton, QFontComboBox, or even QFileDialog, into + QGraphicsScene. It forwards events between the two objects and + translates between QWidget's integer-based geometry and + QGraphicsWidget's qreal-based geometry. QGraphicsProxyWidget + supports all core features of QWidget, including tab focus, + keyboard input, Drag & Drop, and popups. You can also embed + complex widgets, e.g., widgets with subwidgets. + + Example: + + \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsproxywidget.cpp 0 + + QGraphicsProxyWidget takes care of automatically embedding popup children + of embedded widgets through creating a child proxy for each popup. This + means that when an embedded QComboBox shows its popup list, a new + QGraphicsProxyWidget is created automatically, embedding the popup, and + positioning it correctly. + + \section1 Embedding a Widget with QGraphicsProxyWidget + + There are two ways to embed a widget using QGraphicsProxyWidget. The most + common way is to pass a widget pointer to QGraphicsScene::addWidget() + together with any relevant \l Qt::WindowFlags. This function returns a + pointer to a QGraphicsProxyWidget. You can then choose to reparent or + position either the proxy, or the embedded widget itself. + + For example, in the code snippet below, we embed a group box into the proxy: + + \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsproxywidget.cpp 1 + + The image below is the output obtained with its contents margin and + contents rect labeled. + + \image qgraphicsproxywidget-embed.png + + Alternatively, you can start by creating a new QGraphicsProxyWidget item, + and then call setWidget() to embed a QWidget later. The widget() function + returns a pointer to the embedded widget. QGraphicsProxyWidget shares + ownership with QWidget, so if either of the two widgets are destroyed, the + other widget will be automatically destroyed as well. + + \section1 Synchronizing Widget States + + QGraphicsProxyWidget keeps its state in sync with the embedded widget. For + example, if the proxy is hidden or disabled, the embedded widget will be + hidden or disabled as well, and vice versa. When the widget is embedded by + calling addWidget(), QGraphicsProxyWidget copies the state from the widget + into the proxy, and after that, the two will stay synchronized where + possible. By default, when you embed a widget into a proxy, both the widget + and the proxy will be visible because a QGraphicsWidget is visible when + created (you do not have to call show()). If you explicitly hide the + embedded widget, the proxy will also become invisible. + + Example: + + \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsproxywidget.cpp 2 + + QGraphicsProxyWidget maintains symmetry for the following states: + + \table + \header \o QWidget state \o QGraphicsProxyWidget state \o Notes + \row \o QWidget::enabled + \o QGraphicsProxyWidget::enabled + \o + \row \o QWidget::visible + \o QGraphicsProxyWidget::visible + \o The explicit state is also symmetric. + \row \o QWidget::geometry + \o QGraphicsProxyWidget::geometry + \o Geometry is only guaranteed to be symmetric while + the embedded widget is visible. + \row \o QWidget::layoutDirection + \o QGraphicsProxyWidget::layoutDirection + \o + \row \o QWidget::style + \o QGraphicsProxyWidget::style + \o + \row \o QWidget::palette + \o QGraphicsProxyWidget::palette + \o + \row \o QWidget::font + \o QGraphicsProxyWidget::font + \o + \row \o QWidget::cursor + \o QGraphicsProxyWidget::cursor + \o The embedded widget overrides the proxy widget + cursor. The proxy cursor changes depending on + which embedded subwidget is currently under the + mouse. + \row \o QWidget::sizeHint() + \o QGraphicsProxyWidget::sizeHint() + \o All size hint functionality from the embedded + widget is forwarded by the proxy. + \row \o QWidget::getContentsMargins() + \o QGraphicsProxyWidget::getContentsMargins() + \o Updated once by setWidget(). + \row \o QWidget::windowTitle + \o QGraphicsProxyWidget::windowTitle + \o Updated once by setWidget(). + \endtable + + \note QGraphicsScene keeps the embedded widget in a special state that + prevents it from disturbing other widgets (both embedded and not embedded) + while the widget is embedded. In this state, the widget may differ slightly + in behavior from when it is not embedded. + + \sa QGraphicsScene::addWidget(), QGraphicsWidget +*/ + +extern bool qt_sendSpontaneousEvent(QObject *, QEvent *); + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::init() +{ + Q_Q(QGraphicsProxyWidget); + q->setFocusPolicy(Qt::WheelFocus); + q->setAcceptDrops(true); +} + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneHoverEvent *event) +{ + QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseMove); + mouseEvent.setPos(event->pos()); + mouseEvent.setScreenPos(event->screenPos()); + mouseEvent.setButton(Qt::NoButton); + mouseEvent.setButtons(0); + mouseEvent.setModifiers(event->modifiers()); + sendWidgetMouseEvent(&mouseEvent); + event->setAccepted(mouseEvent.isAccepted()); +} + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneMouseEvent *event) +{ + if (!event || !widget || !widget->isVisible()) + return; + Q_Q(QGraphicsProxyWidget); + + // Find widget position and receiver. + QPointF pos = event->pos(); + QPointer<QWidget> alienWidget = widget->childAt(pos.toPoint()); + QPointer<QWidget> receiver = alienWidget ? alienWidget : widget; + + if (QWidgetPrivate::nearestGraphicsProxyWidget(receiver) != q) + return; //another proxywidget will handle the events + + // Translate QGraphicsSceneMouse events to QMouseEvents. + QEvent::Type type = QEvent::None; + switch (event->type()) { + case QEvent::GraphicsSceneMousePress: + type = QEvent::MouseButtonPress; + if (!embeddedMouseGrabber) + embeddedMouseGrabber = receiver; + else + receiver = embeddedMouseGrabber; + break; + case QEvent::GraphicsSceneMouseRelease: + type = QEvent::MouseButtonRelease; + if (embeddedMouseGrabber) + receiver = embeddedMouseGrabber; + break; + case QEvent::GraphicsSceneMouseDoubleClick: + type = QEvent::MouseButtonDblClick; + if (!embeddedMouseGrabber) + embeddedMouseGrabber = receiver; + else + receiver = embeddedMouseGrabber; + break; + case QEvent::GraphicsSceneMouseMove: + type = QEvent::MouseMove; + if (embeddedMouseGrabber) + receiver = embeddedMouseGrabber; + break; + default: + Q_ASSERT_X(false, "QGraphicsProxyWidget", "internal error"); + break; + } + + if (!lastWidgetUnderMouse) { + QApplicationPrivate::dispatchEnterLeave(embeddedMouseGrabber ? embeddedMouseGrabber : widget, 0); + lastWidgetUnderMouse = widget; + } + + // Map event position from us to the receiver + pos = mapToReceiver(pos, receiver); + + // Send mouse event. + QMouseEvent *mouseEvent = QMouseEvent::createExtendedMouseEvent(type, pos, + receiver->mapToGlobal(pos.toPoint()), event->button(), + event->buttons(), event->modifiers()); + + QWidget *embeddedMouseGrabberPtr = (QWidget *)embeddedMouseGrabber; + QApplicationPrivate::sendMouseEvent(receiver, mouseEvent, alienWidget, widget, + &embeddedMouseGrabberPtr, lastWidgetUnderMouse); + embeddedMouseGrabber = embeddedMouseGrabberPtr; + + // Handle enter/leave events when last button is released from mouse + // grabber child widget. + if (embeddedMouseGrabber && type == QEvent::MouseButtonRelease && !event->buttons()) { + Q_Q(QGraphicsProxyWidget); + if (q->rect().contains(event->pos()) && q->acceptsHoverEvents()) + lastWidgetUnderMouse = alienWidget ? alienWidget : widget; + else // released on the frame our outside the item, or doesn't accept hover events. + lastWidgetUnderMouse = 0; + + QApplicationPrivate::dispatchEnterLeave(lastWidgetUnderMouse, embeddedMouseGrabber); + embeddedMouseGrabber = 0; + +#ifndef QT_NO_CURSOR + // ### Restore the cursor, don't override it. + if (!lastWidgetUnderMouse) + q->unsetCursor(); +#endif + } + + event->setAccepted(mouseEvent->isAccepted()); + delete mouseEvent; +} + +void QGraphicsProxyWidgetPrivate::sendWidgetKeyEvent(QKeyEvent *event) +{ + Q_Q(QGraphicsProxyWidget); + if (!event || !widget || !widget->isVisible()) + return; + + QPointer<QWidget> receiver = widget->focusWidget(); + if (!receiver) + receiver = widget; + Q_ASSERT(receiver); + + do { + bool res = QApplication::sendEvent(receiver, event); + if ((res && event->isAccepted()) || (q->isWindow() && receiver == widget)) + break; + receiver = receiver->parentWidget(); + } while (receiver); +} + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::removeSubFocusHelper(QWidget *widget, Qt::FocusReason reason) +{ + QFocusEvent event(QEvent::FocusOut, reason); + QPointer<QWidget> widgetGuard = widget; + QApplication::sendEvent(widget, &event); + if (widgetGuard && event.isAccepted()) + QApplication::sendEvent(widget->style(), &event); +} + +/*! + \internal + + Reimplemented from QGraphicsItemPrivate. ### Qt 5: Move impl to + reimplementation QGraphicsProxyWidget::inputMethodQuery(). +*/ +QVariant QGraphicsProxyWidgetPrivate::inputMethodQueryHelper(Qt::InputMethodQuery query) const +{ + Q_Q(const QGraphicsProxyWidget); + if (!widget || !q->hasFocus()) + return QVariant(); + + QWidget *focusWidget = widget->focusWidget(); + if (!focusWidget) + focusWidget = widget; + QVariant v = focusWidget->inputMethodQuery(query); + QPointF focusWidgetPos = q->subWidgetRect(focusWidget).topLeft(); + switch (v.type()) { + case QVariant::RectF: + v = v.toRectF().translated(focusWidgetPos); + break; + case QVariant::PointF: + v = v.toPointF() + focusWidgetPos; + break; + case QVariant::Rect: + v = v.toRect().translated(focusWidgetPos.toPoint()); + break; + case QVariant::Point: + v = v.toPoint() + focusWidgetPos.toPoint(); + break; + default: + break; + } + return v; +} + +/*! + \internal +*/ +QWidget *QGraphicsProxyWidgetPrivate::findFocusChild(QWidget *child, bool next) const +{ + if (!widget) + return 0; + + // Run around the focus chain until we find a widget that can take tab focus. + if (!child) { + child = next ? (QWidget *)widget : widget->d_func()->focus_prev; + } else { + child = next ? child->d_func()->focus_next : child->d_func()->focus_prev; + if ((next && child == widget) || (!next && child == widget->d_func()->focus_prev)) { + return 0; + } + } + + QWidget *oldChild = child; + do { + if (child->isEnabled() + && child->isVisibleTo(widget) + && (child->focusPolicy() & Qt::TabFocus)) { + return child; + } + child = next ? child->d_func()->focus_next : child->d_func()->focus_prev; + } while (child != oldChild && !(next && child == widget) && !(!next && child == widget->d_func()->focus_prev)); + return 0; +} + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::_q_removeWidgetSlot() +{ + Q_Q(QGraphicsProxyWidget); + widget = 0; + delete q; +} + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::updateWidgetGeometryFromProxy() +{ +} + +/*! + \internal +*/ +void QGraphicsProxyWidgetPrivate::updateProxyGeometryFromWidget() +{ + Q_Q(QGraphicsProxyWidget); + if (!widget) + return; + + QRectF widgetGeometry = widget->geometry(); + QWidget *parentWidget = widget->parentWidget(); + if (widget->isWindow()) { + QGraphicsProxyWidget *proxyParent = 0; + if (parentWidget && (proxyParent = qobject_cast<QGraphicsProxyWidget *>(q->parentWidget()))) { + // Nested window proxy (e.g., combobox popup), map widget to the + // parent widget's global coordinates, and map that to the parent + // proxy's child coordinates. + widgetGeometry.moveTo(proxyParent->subWidgetRect(parentWidget).topLeft() + + parentWidget->mapFromGlobal(widget->pos())); + } + } + + // Adjust to size hint if the widget has never been resized. + if (!widget->size().isValid()) + widgetGeometry.setSize(widget->sizeHint()); + + // Assign new geometry. + posChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + sizeChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + q->setGeometry(widgetGeometry); + posChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode; +} + +/*! + \internal + + Embeds \a subWin as a subwindow of this proxy widget. \a subWin must be a top-level + widget and a descendant of the widget managed by this proxy. A separate subproxy + will be created as a child of this proxy widget to manage \a subWin. +*/ +void QGraphicsProxyWidgetPrivate::embedSubWindow(QWidget *subWin) +{ + QWExtra *extra; + if (!((extra = subWin->d_func()->extra) && extra->proxyWidget)) { + QGraphicsProxyWidget *subProxy = new QGraphicsProxyWidget(q_func()); + subProxy->d_func()->setWidget_helper(subWin, false); + } +} + +/*! + \internal + + Removes ("unembeds") \a subWin and deletes the proxy holder item. This can + happen when QWidget::setParent() reparents the embedded window out of + "embedded space". +*/ +void QGraphicsProxyWidgetPrivate::unembedSubWindow(QWidget *subWin) +{ + foreach (QGraphicsItem *child, children) { + if (child->isWidget()) { + if (QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(static_cast<QGraphicsWidget *>(child))) { + if (proxy->widget() == subWin) { + proxy->setWidget(0); + scene->removeItem(proxy); + delete proxy; + return; + } + } + } + } +} + +bool QGraphicsProxyWidgetPrivate::isProxyWidget() const +{ + return true; +} + +/*! + \internal +*/ +QPointF QGraphicsProxyWidgetPrivate::mapToReceiver(const QPointF &pos, const QWidget *receiver) const +{ + QPointF p = pos; + // Map event position from us to the receiver, preserving its + // precision (don't use QWidget::mapFrom here). + while (receiver && receiver != widget) { + p -= QPointF(receiver->pos()); + receiver = receiver->parentWidget(); + } + return p; +} + +/*! + Constructs a new QGraphicsProxy widget. \a parent and \a wFlags are passed + to QGraphicsItem's constructor. +*/ +QGraphicsProxyWidget::QGraphicsProxyWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags) + : QGraphicsWidget(*new QGraphicsProxyWidgetPrivate, parent, 0, wFlags) +{ + Q_D(QGraphicsProxyWidget); + d->init(); +} + +/*! + Destroys the proxy widget and any embedded widget. +*/ +QGraphicsProxyWidget::~QGraphicsProxyWidget() +{ + Q_D(QGraphicsProxyWidget); + if (d->widget) { + QObject::disconnect(d->widget, SIGNAL(destroyed()), this, SLOT(_q_removeWidgetSlot())); + delete d->widget; + } +} + +/*! + Embeds \a widget into this proxy widget. The embedded widget must reside + exclusively either inside or outside of Graphics View. You cannot embed a + widget as long as it is is visible elsewhere in the UI, at the same time. + + \a widget must be a top-level widget whose parent is 0. + + When the widget is embedded, its state (e.g., visible, enabled, geometry, + size hints) is copied into the proxy widget. If the embedded widget is + explicitly hidden or disabled, the proxy widget will become explicitly + hidden or disabled after embedding is complete. The class documentation + has a full overview over the shared state. + + After this function returns, QGraphicsProxyWidget will keep its state + synchronized with that of \a widget whenever possible. + + If a widget is already embedded by this proxy when this function is + called, that widget will first be automatically unembedded. Passing 0 for + the \a widget argument will only unembed the widget, and the ownership of + the currently embedded widget will be passed on to the caller. + Every child widget that are embedded will also be embedded and their proxy + widget destroyed. + + Note that widgets with the Qt::WA_PaintOnScreen widget attribute + set and widgets that wrap an external application or controller + cannot be embedded. Examples are QGLWidget and QAxWidget. + + \sa widget() +*/ +void QGraphicsProxyWidget::setWidget(QWidget *widget) +{ + Q_D(QGraphicsProxyWidget); + d->setWidget_helper(widget, true); +} + +void QGraphicsProxyWidgetPrivate::setWidget_helper(QWidget *newWidget, bool autoShow) +{ + Q_Q(QGraphicsProxyWidget); + if (newWidget == widget) + return; + if (widget) { + QObject::disconnect(widget, SIGNAL(destroyed()), q, SLOT(_q_removeWidgetSlot())); + widget->removeEventFilter(q); + widget->setAttribute(Qt::WA_DontShowOnScreen, false); + widget->d_func()->extra->proxyWidget = 0; + resolveFont(inheritedFontResolveMask); + resolvePalette(inheritedPaletteResolveMask); + widget->update(); + + foreach (QGraphicsItem *child, q->childItems()) { + if (child->d_ptr->isProxyWidget()) { + QGraphicsProxyWidget *childProxy = static_cast<QGraphicsProxyWidget *>(child); + QWidget * parent = childProxy->widget(); + while (parent->parentWidget() != 0) { + if (parent == widget) + break; + parent = parent->parentWidget(); + } + if (!childProxy->widget() || parent != widget) + continue; + childProxy->setWidget(0); + delete childProxy; + } + } + + widget = 0; +#ifndef QT_NO_CURSOR + q->unsetCursor(); +#endif + q->setAcceptHoverEvents(false); + if (!newWidget) + q->update(); + } + if (!newWidget) + return; + if (!newWidget->isWindow()) { + QWExtra *extra = newWidget->parentWidget()->d_func()->extra; + if (!extra || !extra->proxyWidget) { + qWarning("QGraphicsProxyWidget::setWidget: cannot embed widget %p " + "which is not a toplevel widget, and is not a child of an embedded widget", newWidget); + return; + } + } + + // Register this proxy within the widget's private. + // ### This is a bit backdoorish + QWExtra *extra = newWidget->d_func()->extra; + if (!extra) { + newWidget->d_func()->createExtra(); + extra = newWidget->d_func()->extra; + } + QGraphicsProxyWidget **proxyWidget = &extra->proxyWidget; + if (*proxyWidget) { + if (*proxyWidget != q) { + qWarning("QGraphicsProxyWidget::setWidget: cannot embed widget %p" + "; already embedded", newWidget); + } + return; + } + *proxyWidget = q; + + newWidget->setAttribute(Qt::WA_DontShowOnScreen); + newWidget->ensurePolished(); + // Do not wait for this widget to close before the app closes ### + // shouldn't this widget inherit the attribute? + newWidget->setAttribute(Qt::WA_QuitOnClose, false); + q->setAcceptHoverEvents(true); + + if (newWidget->testAttribute(Qt::WA_NoSystemBackground)) + q->setAttribute(Qt::WA_NoSystemBackground); + if (newWidget->testAttribute(Qt::WA_OpaquePaintEvent)) + q->setAttribute(Qt::WA_OpaquePaintEvent); + + widget = newWidget; + + // Changes only go from the widget to the proxy. + enabledChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + visibleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + posChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + sizeChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + + if ((autoShow && !newWidget->testAttribute(Qt::WA_WState_ExplicitShowHide)) || !newWidget->testAttribute(Qt::WA_WState_Hidden)) { + newWidget->show(); + } + + // Copy the state from the widget onto the proxy. +#ifndef QT_NO_CURSOR + if (newWidget->testAttribute(Qt::WA_SetCursor)) + q->setCursor(widget->cursor()); +#endif + Qt::WFlags flags = newWidget->windowFlags(); + if (newWidget->windowType() == Qt::Window) + flags &= ~Qt::Window; + q->setWindowFlags(flags); + q->setEnabled(newWidget->isEnabled()); + q->setVisible(newWidget->isVisible()); + q->setLayoutDirection(newWidget->layoutDirection()); + if (newWidget->testAttribute(Qt::WA_SetStyle)) + q->setStyle(widget->style()); + + resolveFont(inheritedFontResolveMask); + resolvePalette(inheritedPaletteResolveMask); + + if (!newWidget->testAttribute(Qt::WA_Resized)) + newWidget->adjustSize(); + + int left, top, right, bottom; + newWidget->getContentsMargins(&left, &top, &right, &bottom); + q->setContentsMargins(left, top, right, bottom); + q->setWindowTitle(newWidget->windowTitle()); + + // size policies and constraints.. + q->setSizePolicy(newWidget->sizePolicy()); + QSize sz = newWidget->minimumSize(); + q->setMinimumSize(sz.isNull() ? QSizeF() : QSizeF(sz)); + sz = newWidget->maximumSize(); + q->setMaximumSize(sz.isNull() ? QSizeF() : QSizeF(sz)); + + updateProxyGeometryFromWidget(); + + // Hook up the event filter to keep the state up to date. + newWidget->installEventFilter(q); + QObject::connect(newWidget, SIGNAL(destroyed()), q, SLOT(_q_removeWidgetSlot())); + + // Changes no longer go only from the widget to the proxy. + enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + posChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode; +} + +/*! + Returns a pointer to the embedded widget. + + \sa setWidget() +*/ +QWidget *QGraphicsProxyWidget::widget() const +{ + Q_D(const QGraphicsProxyWidget); + return d->widget; +} + +/*! + Returns the rectangle for \a widget, which must be a descendant of + widget(), or widget() itself, in this proxy item's local coordinates. + + If no widget is embedded, \a widget is 0, or \a widget is not a + descendant of the embedded widget, this function returns an empty QRectF. + + \sa widget() +*/ +QRectF QGraphicsProxyWidget::subWidgetRect(const QWidget *widget) const +{ + Q_D(const QGraphicsProxyWidget); + if (!widget || !d->widget) + return QRectF(); + if (d->widget == widget || d->widget->isAncestorOf(widget)) + return QRectF(widget->mapTo(d->widget, QPoint(0, 0)), widget->size()); + return QRectF(); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::setGeometry(const QRectF &rect) +{ + Q_D(QGraphicsProxyWidget); + bool proxyResizesWidget = !d->posChangeMode && !d->sizeChangeMode; + if (proxyResizesWidget) { + d->posChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode; + d->sizeChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode; + } + QGraphicsWidget::setGeometry(rect); + if (proxyResizesWidget) { + d->posChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + d->sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + } +} + +/*! + \reimp +*/ +QVariant QGraphicsProxyWidget::itemChange(GraphicsItemChange change, + const QVariant &value) +{ + Q_D(QGraphicsProxyWidget); + + switch (change) { + case ItemPositionChange: + // The item's position is either changed directly on the proxy, in + // which case the position change should propagate to the widget, + // otherwise it happens as a side effect when filtering QEvent::Move. + if (!d->posChangeMode) + d->posChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode; + break; + case ItemPositionHasChanged: + // Move the internal widget if we're in widget-to-proxy + // mode. Otherwise the widget has already moved. + if (d->widget && d->posChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode) + d->widget->move(value.toPoint()); + if (d->posChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode) + d->posChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + break; + case ItemVisibleChange: + if (!d->visibleChangeMode) + d->visibleChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode; + break; + case ItemVisibleHasChanged: + if (d->widget && d->visibleChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode) + d->widget->setVisible(isVisible()); + if (d->visibleChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode) + d->visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + break; + case ItemEnabledChange: + if (!d->enabledChangeMode) + d->enabledChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode; + break; + case ItemEnabledHasChanged: + if (d->widget && d->enabledChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode) + d->widget->setEnabled(isEnabled()); + if (d->enabledChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode) + d->enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + break; + default: + break; + } + return QGraphicsWidget::itemChange(change, value); +} + +/*! + \reimp +*/ +bool QGraphicsProxyWidget::event(QEvent *event) +{ + Q_D(QGraphicsProxyWidget); + if (!d->widget) + return QGraphicsWidget::event(event); + + switch (event->type()) { + case QEvent::StyleChange: + // Propagate style changes to the embedded widget. + if (!d->styleChangeMode) { + d->styleChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode; + d->widget->setStyle(style()); + d->styleChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + } + break; + case QEvent::FontChange: { + // Propagate to widget. + QWidgetPrivate *wd = d->widget->d_func(); + int mask = d->font.resolve() | d->inheritedFontResolveMask; + wd->inheritedFontResolveMask = mask; + wd->resolveFont(); + break; + } + case QEvent::PaletteChange: { + // Propagate to widget. + QWidgetPrivate *wd = d->widget->d_func(); + int mask = d->palette.resolve() | d->inheritedPaletteResolveMask; + wd->inheritedPaletteResolveMask = mask; + wd->resolvePalette(); + break; + } + case QEvent::InputMethod: { + // Forward input method events if the focus widget enables + // input methods. + // ### Qt 4.5: this code must also go into a reimplementation + // of inputMethodEvent(). + QWidget *focusWidget = d->widget->focusWidget(); + if (focusWidget->testAttribute(Qt::WA_InputMethodEnabled)) + QApplication::sendEvent(focusWidget, event); + break; + } + case QEvent::ShortcutOverride: { + QWidget *focusWidget = d->widget->focusWidget(); + while (focusWidget) { + QApplication::sendEvent(focusWidget, event); + if (event->isAccepted()) + return true; + focusWidget = focusWidget->parentWidget(); + } + return false; + } + case QEvent::KeyPress: { + QKeyEvent *k = static_cast<QKeyEvent *>(event); + if (k->key() == Qt::Key_Tab || k->key() == Qt::Key_Backtab) { + if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) { //### Add MetaModifier? + QWidget *focusWidget = d->widget->focusWidget(); + while (focusWidget) { + bool res = QApplication::sendEvent(focusWidget, event); + if ((res && event->isAccepted()) || (isWindow() && focusWidget == d->widget)) { + event->accept(); + break; + } + focusWidget = focusWidget->parentWidget(); + } + return true; + } + } + break; + } + default: + break; + } + return QGraphicsWidget::event(event); +} + +/*! + \reimp +*/ +bool QGraphicsProxyWidget::eventFilter(QObject *object, QEvent *event) +{ + Q_D(QGraphicsProxyWidget); + + if (object == d->widget) { + switch (event->type()) { + case QEvent::LayoutRequest: + updateGeometry(); + break; + case QEvent::Resize: + // If the widget resizes itself, we resize the proxy too. + // Prevent feed-back by checking the geometry change mode. + if (!d->sizeChangeMode) + d->updateProxyGeometryFromWidget(); + break; + case QEvent::Move: + // If the widget moves itself, we move the proxy too. Prevent + // feed-back by checking the geometry change mode. + if (!d->posChangeMode) + d->updateProxyGeometryFromWidget(); + break; + case QEvent::Hide: + case QEvent::Show: + // If the widget toggles its visible state, the proxy will follow. + if (!d->visibleChangeMode) { + d->visibleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + setVisible(event->type() == QEvent::Show); + d->visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + } + break; + case QEvent::EnabledChange: + // If the widget toggles its enabled state, the proxy will follow. + if (!d->enabledChangeMode) { + d->enabledChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + setEnabled(d->widget->isEnabled()); + d->enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + } + break; + case QEvent::StyleChange: + // Propagate style changes to the proxy. + if (!d->styleChangeMode) { + d->styleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode; + setStyle(d->widget->style()); + d->styleChangeMode = QGraphicsProxyWidgetPrivate::NoMode; + } + break; + default: + break; + } + } + return QGraphicsWidget::eventFilter(object, event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::showEvent(QShowEvent *event) +{ + Q_UNUSED(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::hideEvent(QHideEvent *event) +{ + Q_UNUSED(event); +} + +#ifndef QT_NO_CONTEXTMENU +/*! + \reimp +*/ +void QGraphicsProxyWidget::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) +{ + Q_D(QGraphicsProxyWidget); + if (!event || !d->widget || !d->widget->isVisible()) + return; + + // Find widget position and receiver. + QPointF pos = event->pos(); + QPointer<QWidget> alienWidget = d->widget->childAt(pos.toPoint()); + QPointer<QWidget> receiver = alienWidget ? alienWidget : d->widget; + + // Map event position from us to the receiver + pos = d->mapToReceiver(pos, receiver); + + // Send mouse event. ### Doesn't propagate the event. + QContextMenuEvent contextMenuEvent(QContextMenuEvent::Reason(event->reason()), + pos.toPoint(), receiver->mapToGlobal(pos.toPoint()), event->modifiers()); + QApplication::sendEvent(receiver, &contextMenuEvent); + + event->setAccepted(contextMenuEvent.isAccepted()); +} +#endif // QT_NO_CONTEXTMENU + +#ifndef QT_NO_DRAGANDDROP +/*! + \reimp +*/ +void QGraphicsProxyWidget::dragEnterEvent(QGraphicsSceneDragDropEvent *event) +{ +#ifdef QT_NO_DRAGANDDROP + Q_UNUSED(event); +#else + Q_D(QGraphicsProxyWidget); + if (!d->widget) + return; + + QDragEnterEvent proxyDragEnter(event->pos().toPoint(), event->dropAction(), event->mimeData(), event->buttons(), event->modifiers()); + proxyDragEnter.setAccepted(event->isAccepted()); + QApplication::sendEvent(d->widget, &proxyDragEnter); + event->setAccepted(proxyDragEnter.isAccepted()); + if (proxyDragEnter.isAccepted()) // we discard answerRect + event->setDropAction(proxyDragEnter.dropAction()); +#endif +} +/*! + \reimp +*/ +void QGraphicsProxyWidget::dragLeaveEvent(QGraphicsSceneDragDropEvent *event) +{ + Q_UNUSED(event); +#ifndef QT_NO_DRAGANDDROP + Q_D(QGraphicsProxyWidget); + if (!d->widget || !d->dragDropWidget) + return; + QDragLeaveEvent proxyDragLeave; + QApplication::sendEvent(d->dragDropWidget, &proxyDragLeave); + d->dragDropWidget = 0; +#endif +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::dragMoveEvent(QGraphicsSceneDragDropEvent *event) +{ +#ifdef QT_NO_DRAGANDDROP + Q_UNUSED(event); +#else + Q_D(QGraphicsProxyWidget); + if (!d->widget) + return; + QPointF p = event->pos(); + event->ignore(); + QPointer<QWidget> subWidget = d->widget->childAt(p.toPoint()); + QPointer<QWidget> receiver = subWidget ? subWidget : d->widget; + bool eventDelivered = false; + for (; receiver; receiver = receiver->parentWidget()) { + if (!receiver->isEnabled() || !receiver->acceptDrops()) + continue; + // Map event position from us to the receiver + QPoint receiverPos = d->mapToReceiver(p, receiver).toPoint(); + if (receiver != d->dragDropWidget) { + // Try to enter before we leave + QDragEnterEvent dragEnter(receiverPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers()); + dragEnter.setDropAction(event->proposedAction()); + QApplication::sendEvent(receiver, &dragEnter); + event->setAccepted(dragEnter.isAccepted()); + event->setDropAction(dragEnter.dropAction()); + if (!event->isAccepted()) { + // propagate to the parent widget + continue; + } + + d->lastDropAction = event->dropAction(); + + if (d->dragDropWidget) { + QDragLeaveEvent dragLeave; + QApplication::sendEvent(d->dragDropWidget, &dragLeave); + } + d->dragDropWidget = receiver; + } + + QDragMoveEvent dragMove(receiverPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers()); + event->setDropAction(d->lastDropAction); + QApplication::sendEvent(receiver, &dragMove); + event->setAccepted(dragMove.isAccepted()); + event->setDropAction(dragMove.dropAction()); + if (event->isAccepted()) + d->lastDropAction = event->dropAction(); + eventDelivered = true; + break; + } + + if (!eventDelivered) { + if (d->dragDropWidget) { + // Leave the last drag drop item + QDragLeaveEvent dragLeave; + QApplication::sendEvent(d->dragDropWidget, &dragLeave); + d->dragDropWidget = 0; + } + // Propagate + event->setDropAction(Qt::IgnoreAction); + } +#endif +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::dropEvent(QGraphicsSceneDragDropEvent *event) +{ +#ifdef QT_NO_DRAGANDDROP + Q_UNUSED(event); +#else + Q_D(QGraphicsProxyWidget); + if (d->widget && d->dragDropWidget) { + QPoint widgetPos = d->mapToReceiver(event->pos(), d->dragDropWidget).toPoint(); + QDropEvent dropEvent(widgetPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers()); + QApplication::sendEvent(d->dragDropWidget, &dropEvent); + event->setAccepted(dropEvent.isAccepted()); + d->dragDropWidget = 0; + } +#endif +} +#endif + +/*! + \reimp +*/ +void QGraphicsProxyWidget::hoverEnterEvent(QGraphicsSceneHoverEvent *event) +{ + Q_UNUSED(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) +{ + Q_UNUSED(event); + Q_D(QGraphicsProxyWidget); + // If hoverMove was compressed away, make sure we update properly here. + if (d->lastWidgetUnderMouse) { + QApplicationPrivate::dispatchEnterLeave(0, d->lastWidgetUnderMouse); + d->lastWidgetUnderMouse = 0; + } +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::hoverMoveEvent(QGraphicsSceneHoverEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::hoverMoveEvent"; +#endif + // Ignore events on the window frame. + if (!d->widget || !rect().contains(event->pos())) { + if (d->lastWidgetUnderMouse) { + QApplicationPrivate::dispatchEnterLeave(0, d->lastWidgetUnderMouse); + d->lastWidgetUnderMouse = 0; + } + return; + } + + d->embeddedMouseGrabber = 0; + d->sendWidgetMouseEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::grabMouseEvent(QEvent *event) +{ + Q_UNUSED(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::ungrabMouseEvent(QEvent *event) +{ + Q_D(QGraphicsProxyWidget); + Q_UNUSED(event); + d->embeddedMouseGrabber = 0; +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::mouseMoveEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::mouseMoveEvent"; +#endif + d->sendWidgetMouseEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::mousePressEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::mousePressEvent"; +#endif + d->sendWidgetMouseEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::mouseDoubleClickEvent"; +#endif + d->sendWidgetMouseEvent(event); +} + +/*! + \reimp +*/ +#ifndef QT_NO_WHEELEVENT +void QGraphicsProxyWidget::wheelEvent(QGraphicsSceneWheelEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::wheelEvent"; +#endif + if (!d->widget) + return; + + QPointF pos = event->pos(); + QPointer<QWidget> receiver = d->widget->childAt(pos.toPoint()); + if (!receiver) + receiver = d->widget; + + // Map event position from us to the receiver + pos = d->mapToReceiver(pos, receiver); + + // Send mouse event. + QWheelEvent wheelEvent(pos.toPoint(), event->screenPos(), event->delta(), + event->buttons(), event->modifiers(), event->orientation()); + QPointer<QWidget> focusWidget = d->widget->focusWidget(); + extern bool qt_sendSpontaneousEvent(QObject *, QEvent *); + qt_sendSpontaneousEvent(receiver, &wheelEvent); + event->setAccepted(wheelEvent.isAccepted()); + + // ### Remove, this should be done by proper focusIn/focusOut events. + if (focusWidget && !focusWidget->hasFocus()) { + focusWidget->update(); + focusWidget = d->widget->focusWidget(); + if (focusWidget && focusWidget->hasFocus()) + focusWidget->update(); + } +} +#endif + +/*! + \reimp +*/ +void QGraphicsProxyWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::mouseReleaseEvent"; +#endif + d->sendWidgetMouseEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::keyPressEvent(QKeyEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::keyPressEvent"; +#endif + d->sendWidgetKeyEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::keyReleaseEvent(QKeyEvent *event) +{ + Q_D(QGraphicsProxyWidget); +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::keyReleaseEvent"; +#endif + d->sendWidgetKeyEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::focusInEvent(QFocusEvent *event) +{ +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::focusInEvent"; +#endif + Q_D(QGraphicsProxyWidget); + + if (d->focusFromWidgetToProxy) { + // Prevent recursion when the proxy autogains focus through the + // embedded widget calling setFocus(). ### Could be done with event + // filter on FocusIn instead? + return; + } + + switch (event->reason()) { + case Qt::TabFocusReason: { + if (QWidget *focusChild = d->findFocusChild(0, true)) + focusChild->setFocus(event->reason()); + break; + } + case Qt::BacktabFocusReason: + if (QWidget *focusChild = d->findFocusChild(0, false)) + focusChild->setFocus(event->reason()); + break; + default: + if (d->widget && d->widget->focusWidget()) { + d->widget->focusWidget()->setFocus(event->reason()); + return; + } + break; + } +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::focusOutEvent(QFocusEvent *event) +{ +#ifdef GRAPHICSPROXYWIDGET_DEBUG + qDebug() << "QGraphicsProxyWidget::focusOutEvent"; +#endif + Q_D(QGraphicsProxyWidget); + if (d->widget) { + // We need to explicitly remove subfocus from the embedded widget's + // focus widget. + if (QWidget *focusWidget = d->widget->focusWidget()) + d->removeSubFocusHelper(focusWidget, event->reason()); + } +} + +/*! + \reimp +*/ +bool QGraphicsProxyWidget::focusNextPrevChild(bool next) +{ + Q_D(QGraphicsProxyWidget); + if (!d->widget || !d->scene) + return QGraphicsWidget::focusNextPrevChild(next); + + Qt::FocusReason reason = next ? Qt::TabFocusReason : Qt::BacktabFocusReason; + QWidget *lastFocusChild = d->widget->focusWidget(); + if (QWidget *newFocusChild = d->findFocusChild(lastFocusChild, next)) { + newFocusChild->setFocus(reason); + return true; + } + + return QGraphicsWidget::focusNextPrevChild(next); +} + +/*! + \reimp +*/ +QSizeF QGraphicsProxyWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const +{ + Q_D(const QGraphicsProxyWidget); + if (!d->widget) + return QGraphicsWidget::sizeHint(which, constraint); + + QSizeF sh; + switch (which) { + case Qt::PreferredSize: + if (QLayout *l = d->widget->layout()) + sh = l->sizeHint(); + else + sh = d->widget->sizeHint(); + break; + case Qt::MinimumSize: + if (QLayout *l = d->widget->layout()) + sh = l->minimumSize(); + else + sh = d->widget->minimumSizeHint(); + break; + case Qt::MaximumSize: + if (QLayout *l = d->widget->layout()) + sh = l->maximumSize(); + else + sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX); + break; + case Qt::MinimumDescent: + sh = constraint; + break; + default: + break; + } + return sh; +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::resizeEvent(QGraphicsSceneResizeEvent *event) +{ + Q_D(QGraphicsProxyWidget); + if (d->widget) { + if (d->sizeChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode) + d->widget->resize(event->newSize().toSize()); + } + QGraphicsWidget::resizeEvent(event); +} + +/*! + \reimp +*/ +void QGraphicsProxyWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) +{ + Q_D(QGraphicsProxyWidget); + Q_UNUSED(widget); + if (!d->widget || !d->widget->isVisible()) + return; + + // Filter out repaints on the window frame. + const QRect exposedWidgetRect = (option->exposedRect & rect()).toRect(); + if (exposedWidgetRect.isEmpty()) + return; + + // Disable QPainter's default pen being cosmetic. This allows widgets and + // styles to follow Qt's existing defaults without getting ugly cosmetic + // lines when scaled. + bool restore = !(painter->renderHints() & QPainter::NonCosmeticDefaultPen); + painter->setRenderHints(QPainter::NonCosmeticDefaultPen, true); + + d->widget->render(painter, exposedWidgetRect.topLeft(), exposedWidgetRect); + + // Restore the render hints if necessary. + if (restore) + painter->setRenderHints(QPainter::NonCosmeticDefaultPen, false); +} + +/*! + \reimp +*/ +int QGraphicsProxyWidget::type() const +{ + return Type; +} + +/*! + \since 4.5 + + Creates a proxy widget for the given \a child of the widget + contained in this proxy. + + This function makes it possible to aquire proxies for + non top-level widgets. For instance, you can embed a dialog, + and then transform only one of its widgets. + + If the widget is already embedded, return the existing proxy widget. + + \sa newProxyWidget(), QGraphicsScene::addWidget() +*/ +QGraphicsProxyWidget *QGraphicsProxyWidget::createProxyForChildWidget(QWidget *child) +{ + QGraphicsProxyWidget *proxy = child->graphicsProxyWidget(); + if (proxy) + return proxy; + if (!child->parentWidget()) { + qWarning("QGraphicsProxyWidget::createProxyForChildWidget: top-level widget not in a QGraphicsScene"); + return 0; + } + + QGraphicsProxyWidget *parentProxy = createProxyForChildWidget(child->parentWidget()); + if (!parentProxy) + return 0; + + if (!QMetaObject::invokeMethod(parentProxy, "newProxyWidget", Qt::DirectConnection, + Q_RETURN_ARG(QGraphicsProxyWidget*, proxy), Q_ARG(const QWidget*, child))) + return 0; + proxy->setParent(parentProxy); + proxy->setWidget(child); + return proxy; +} + +/*! + \fn QGraphicsProxyWidget *QGraphicsProxyWidget::newProxyWidget(const QWidget *child) + \since 4.5 + + Creates a proxy widget for the given \a child of the widget contained in this + proxy. + + You should not call this function directly; use + QGraphicsProxyWidget::createProxyForChildWidget() instead. + + This function is a fake virtual slot that you can reimplement in + your subclass in order to control how new proxy widgets are + created. The default implementation returns a proxy created with + the QGraphicsProxyWidget() constructor with this proxy widget as + the parent. + + \sa createProxyForChildWidget() +*/ +QGraphicsProxyWidget *QGraphicsProxyWidget::newProxyWidget(const QWidget *) +{ + return new QGraphicsProxyWidget(this); +} + + + +QT_END_NAMESPACE + +#include "moc_qgraphicsproxywidget.cpp" + +#endif //QT_NO_GRAPHICSVIEW |