/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying ** this package. ** ** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qglobal.h" #ifndef QT_NO_GRAPHICSVIEW #include "qgraphicswidget.h" #include "qgraphicswidget_p.h" #include "qgraphicslayout.h" #include "qgraphicslayout_p.h" #include "qgraphicsscene.h" #include "qgraphicssceneevent.h" #ifndef QT_NO_ACTION #include #endif #include #include #ifndef QT_NO_SHORTCUT #include #endif #include #include #include #include #include #include #include QT_BEGIN_NAMESPACE /*! \class QGraphicsWidget \brief The QGraphicsWidget class is the base class for all widget items in a QGraphicsScene. \since 4.4 \ingroup graphicsview-api QGraphicsWidget is an extended base item that provides extra functionality over QGraphicsItem. It is similar to QWidget in many ways: \list \o Provides a \l palette, a \l font and a \l style(). \o Has a defined geometry(). \o Supports layouts with setLayout() and layout(). \o Supports shortcuts and actions with grabShortcut() and insertAction() \endlist Unlike QGraphicsItem, QGraphicsWidget is not an abstract class; you can create instances of a QGraphicsWidget without having to subclass it. This approach is useful for widgets that only serve the purpose of organizing child widgets into a layout. QGraphicsWidget can be used as a base item for your own custom item if you require advanced input focus handling, e.g., tab focus and activation, or layouts. Since QGraphicsWidget resembles QWidget and has similar API, it is easier to port a widget from QWidget to QGraphicsWidget, instead of QGraphicsItem. \note QWidget-based widgets can be directly embedded into a QGraphicsScene using QGraphicsProxyWidget. Noticeable differences between QGraphicsWidget and QWidget are: \table \header \o QGraphicsWidget \o QWidget \row \o Coordinates and geometry are defined with qreals (doubles or floats, depending on the platform). \o QWidget uses integer geometry (QPoint, QRect). \row \o The widget is already visible by default; you do not have to call show() to display the widget. \o QWidget is hidden by default until you call show(). \row \o A subset of widget attributes are supported. \o All widget attributes are supported. \row \o A top-level item's style defaults to QGraphicsScene::style \o A top-level widget's style defaults to QApplication::style \row \o Graphics View provides a custom drag and drop framework, different from QWidget. \o Standard drag and drop framework. \row \o Widget items do not support modality. \o Full modality support. \endtable QGraphicsWidget supports a subset of Qt's widget attributes, (Qt::WidgetAttribute), as shown in the table below. Any attributes not listed in this table are unsupported, or otherwise unused. \table \header \o Widget Attribute \o Usage \row \o Qt::WA_SetLayoutDirection \o Set by setLayoutDirection(), cleared by unsetLayoutDirection(). You can test this attribute to check if the widget has been explicitly assigned a \l{QGraphicsWidget::layoutDirection()} {layoutDirection}. If the attribute is not set, the \l{QGraphicsWidget::layoutDirection()} {layoutDirection()} is inherited. \row \o Qt::WA_RightToLeft \o Toggled by setLayoutDirection(). Inherited from the parent/scene. If set, the widget's layout will order horizontally arranged widgets from right to left. \row \o Qt::WA_SetStyle \o Set and cleared by setStyle(). If this attribute is set, the widget has been explicitly assigned a style. If it is unset, the widget will use the scene's or the application's style. \row \o Qt::WA_Resized \o Set by setGeometry() and resize(). \row \o Qt::WA_SetPalette \o Set by setPalette(). \row \o Qt::WA_SetFont \o Set by setPalette(). \row \o Qt::WA_WindowPropagation \o Enables propagation to window widgets. \endtable Although QGraphicsWidget inherits from both QObject and QGraphicsItem, you should use the functions provided by QGraphicsItem, \e not QObject, to manage the relationships between parent and child items. These functions control the stacking order of items as well as their ownership. \note The QObject::parent() should always return 0 for QGraphicsWidgets, but this policy is not strictly defined. \sa QGraphicsProxyWidget, QGraphicsItem, {Widgets and Layouts} */ /*! Constructs a QGraphicsWidget instance. The optional \a parent argument is passed to QGraphicsItem's constructor. The optional \a wFlags argument specifies the widget's window flags (e.g., whether the widget should be a window, a tool, a popup, etc). */ QGraphicsWidget::QGraphicsWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags) : QGraphicsObject(*new QGraphicsWidgetPrivate, 0, 0), QGraphicsLayoutItem(0, false) { Q_D(QGraphicsWidget); d->init(parent, wFlags); } /*! \internal Constructs a new QGraphicsWidget, using \a dd as parent. */ QGraphicsWidget::QGraphicsWidget(QGraphicsWidgetPrivate &dd, QGraphicsItem *parent, QGraphicsScene *scene, Qt::WindowFlags wFlags) : QGraphicsObject(dd, 0, scene), QGraphicsLayoutItem(0, false) { Q_D(QGraphicsWidget); d->init(parent, wFlags); } /* \internal \class QGraphicsWidgetStyles We use this thread-safe class to maintain a hash of styles for widgets styles. Note that QApplication::style() itself isn't thread-safe, QStyle isn't thread-safe, and we don't have a thread-safe factory for creating the default style, nor cloning a style. */ class QGraphicsWidgetStyles { public: QStyle *styleForWidget(const QGraphicsWidget *widget) const { QMutexLocker locker(&mutex); return styles.value(widget, 0); } void setStyleForWidget(QGraphicsWidget *widget, QStyle *style) { QMutexLocker locker(&mutex); if (style) styles[widget] = style; else styles.remove(widget); } private: QMap styles; mutable QMutex mutex; }; Q_GLOBAL_STATIC(QGraphicsWidgetStyles, widgetStyles) /*! Destroys the QGraphicsWidget instance. */ QGraphicsWidget::~QGraphicsWidget() { Q_D(QGraphicsWidget); #ifndef QT_NO_ACTION // Remove all actions from this widget for (int i = 0; i < d->actions.size(); ++i) { QActionPrivate *apriv = d->actions.at(i)->d_func(); apriv->graphicsWidgets.removeAll(this); } d->actions.clear(); #endif if (QGraphicsScene *scn = scene()) { QGraphicsScenePrivate *sceneD = scn->d_func(); if (sceneD->tabFocusFirst == this) sceneD->tabFocusFirst = (d->focusNext == this ? 0 : d->focusNext); } d->focusPrev->d_func()->focusNext = d->focusNext; d->focusNext->d_func()->focusPrev = d->focusPrev; // Play it really safe d->focusNext = this; d->focusPrev = this; clearFocus(); //we check if we have a layout previously if (d->layout) { QGraphicsLayout *temp = d->layout; foreach (QGraphicsItem * item, childItems()) { // In case of a custom layout which doesn't remove and delete items, we ensure that // the parent layout item does not point to the deleted layout. This code is here to // avoid regression from 4.4 to 4.5, because according to 4.5 docs it is not really needed. if (item->isWidget()) { QGraphicsWidget *widget = static_cast(item); if (widget->parentLayoutItem() == d->layout) widget->setParentLayoutItem(0); } } d->layout = 0; delete temp; } // Remove this graphics widget from widgetStyles widgetStyles()->setStyleForWidget(this, 0); } /*! \property QGraphicsWidget::size \brief the size of the widget Calling resize() resizes the widget to a \a size bounded by minimumSize() and maximumSize(). This property only affects the widget's width and height (e.g., its right and bottom edges); the widget's position and top-left corner remains unaffected. Resizing a widget triggers the widget to immediately receive a \l{QEvent::GraphicsSceneResize}{GraphicsSceneResize} event with the widget's old and new size. If the widget has a layout assigned when this event arrives, the layout will be activated and it will automatically update any child widgets's geometry. This property does not affect any layout of the parent widget. If the widget itself is managed by a parent layout; e.g., it has a parent widget with a layout assigned, that layout will not activate. By default, this property contains a size with zero width and height. \sa setGeometry(), QGraphicsSceneResizeEvent, QGraphicsLayout */ QSizeF QGraphicsWidget::size() const { return QGraphicsLayoutItem::geometry().size(); } void QGraphicsWidget::resize(const QSizeF &size) { setGeometry(QRectF(pos(), size)); } /*! \fn void QGraphicsWidget::resize(qreal w, qreal h) This convenience function is equivalent to calling resize(QSizeF(w, h)). \sa setGeometry(), setTransform() */ /*! \property QGraphicsWidget::sizePolicy \brief the size policy for the widget \sa sizePolicy(), setSizePolicy(), QWidget::sizePolicy() */ /*! \fn QGraphicsWidget::geometryChanged() This signal gets emitted whenever the geometry of the item changes \internal */ /*! \property QGraphicsWidget::geometry \brief the geometry of the widget Sets the item's geometry to \a rect. The item's position and size are modified as a result of calling this function. The item is first moved, then resized. A side effect of calling this function is that the widget will receive a move event and a resize event. Also, if the widget has a layout assigned, the layout will activate. \sa geometry(), resize() */ void QGraphicsWidget::setGeometry(const QRectF &rect) { QGraphicsWidgetPrivate *wd = QGraphicsWidget::d_func(); QGraphicsLayoutItemPrivate *d = QGraphicsLayoutItem::d_ptr.data(); QRectF newGeom; QPointF oldPos = d->geom.topLeft(); if (!wd->inSetPos) { setAttribute(Qt::WA_Resized); newGeom = rect; newGeom.setSize(rect.size().expandedTo(effectiveSizeHint(Qt::MinimumSize)) .boundedTo(effectiveSizeHint(Qt::MaximumSize))); if (newGeom == d->geom) return; // setPos triggers ItemPositionChange, which can adjust position wd->inSetGeometry = 1; setPos(newGeom.topLeft()); wd->inSetGeometry = 0; newGeom.moveTopLeft(pos()); if (newGeom == d->geom) return; // Update and prepare to change the geometry (remove from index) if the size has changed. if (wd->scene) { if (rect.topLeft() == d->geom.topLeft()) { prepareGeometryChange(); } } } // Update the layout item geometry bool moved = oldPos != pos(); if (moved) { // Send move event. QGraphicsSceneMoveEvent event; event.setOldPos(oldPos); event.setNewPos(pos()); QApplication::sendEvent(this, &event); if (wd->inSetPos) { //set the new pos d->geom.moveTopLeft(pos()); return; } } QSizeF oldSize = size(); QGraphicsLayoutItem::setGeometry(newGeom); emit geometryChanged(); // Send resize event bool resized = newGeom.size() != oldSize; if (resized) { QGraphicsSceneResizeEvent re; re.setOldSize(oldSize); re.setNewSize(newGeom.size()); if (oldSize.width() != newGeom.size().width()) emit widthChanged(); if (oldSize.height() != newGeom.size().height()) emit heightChanged(); QApplication::sendEvent(this, &re); } } /*! \fn QGraphicsWidget::geometryChanged() This signal gets emitted whenever the geometry is changed in setGeometry(). */ /*! \fn QRectF QGraphicsWidget::rect() const Returns the item's local rect as a QRectF. This function is equivalent to QRectF(QPointF(), size()). \sa setGeometry(), resize() */ /*! \fn void QGraphicsWidget::setGeometry(qreal x, qreal y, qreal w, qreal h) This convenience function is equivalent to calling setGeometry(QRectF( \a x, \a y, \a w, \a h)). \sa geometry(), resize() */ /*! \property QGraphicsWidget::minimumSize \brief the minimum size of the widget \sa setMinimumSize(), minimumSize(), preferredSize, maximumSize */ /*! \property QGraphicsWidget::preferredSize \brief the preferred size of the widget \sa setPreferredSize(), preferredSize(), minimumSize, maximumSize */ /*! \property QGraphicsWidget::maximumSize \brief the maximum size of the widget \sa setMaximumSize(), maximumSize(), minimumSize, preferredSize */ /*! Sets the widget's contents margins to \a left, \a top, \a right and \a bottom. Contents margins are used by the assigned layout to define the placement of subwidgets and layouts. Margins are particularily useful for widgets that constrain subwidgets to only a section of its own geometry. For example, a group box with a layout will place subwidgets inside its frame, but below the title. Changing a widget's contents margins will always trigger an update(), and any assigned layout will be activated automatically. The widget will then receive a \l{QEvent::ContentsRectChange}{ContentsRectChange} event. \sa getContentsMargins(), setGeometry() */ void QGraphicsWidget::setContentsMargins(qreal left, qreal top, qreal right, qreal bottom) { Q_D(QGraphicsWidget); if (!d->margins && left == 0 && top == 0 && right == 0 && bottom == 0) return; d->ensureMargins(); if (left == d->margins[d->Left] && top == d->margins[d->Top] && right == d->margins[d->Right] && bottom == d->margins[d->Bottom]) return; d->margins[d->Left] = left; d->margins[d->Top] = top; d->margins[d->Right] = right; d->margins[d->Bottom] = bottom; if (QGraphicsLayout *l = d->layout) l->invalidate(); else updateGeometry(); QEvent e(QEvent::ContentsRectChange); QApplication::sendEvent(this, &e); } /*! Gets the widget's contents margins. The margins are stored in \a left, \a top, \a right and \a bottom, as pointers to qreals. Each argument can be \e {omitted} by passing 0. \sa setContentsMargins() */ void QGraphicsWidget::getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const { Q_D(const QGraphicsWidget); if (left || top || right || bottom) d->ensureMargins(); if (left) *left = d->margins[d->Left]; if (top) *top = d->margins[d->Top]; if (right) *right = d->margins[d->Right]; if (bottom) *bottom = d->margins[d->Bottom]; } /*! Sets the widget's window frame margins to \a left, \a top, \a right and \a bottom. The default frame margins are provided by the style, and they depend on the current window flags. If you would like to draw your own window decoration, you can set your own frame margins to override the default margins. \sa unsetWindowFrameMargins(), getWindowFrameMargins(), windowFrameRect() */ void QGraphicsWidget::setWindowFrameMargins(qreal left, qreal top, qreal right, qreal bottom) { Q_D(QGraphicsWidget); if (!d->windowFrameMargins && left == 0 && top == 0 && right == 0 && bottom == 0) return; d->ensureWindowFrameMargins(); bool unchanged = d->windowFrameMargins[d->Left] == left && d->windowFrameMargins[d->Top] == top && d->windowFrameMargins[d->Right] == right && d->windowFrameMargins[d->Bottom] == bottom; if (d->setWindowFrameMargins && unchanged) return; if (!unchanged) prepareGeometryChange(); d->windowFrameMargins[d->Left] = left; d->windowFrameMargins[d->Top] = top; d->windowFrameMargins[d->Right] = right; d->windowFrameMargins[d->Bottom] = bottom; d->setWindowFrameMargins = true; } /*! Gets the widget's window frame margins. The margins are stored in \a left, \a top, \a right and \a bottom as pointers to qreals. Each argument can be \e {omitted} by passing 0. \sa setWindowFrameMargins(), windowFrameRect() */ void QGraphicsWidget::getWindowFrameMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const { Q_D(const QGraphicsWidget); if (left || top || right || bottom) d->ensureWindowFrameMargins(); if (left) *left = d->windowFrameMargins[d->Left]; if (top) *top = d->windowFrameMargins[d->Top]; if (right) *right = d->windowFrameMargins[d->Right]; if (bottom) *bottom = d->windowFrameMargins[d->Bottom]; } /*! Resets the window frame margins to the default value, provided by the style. \sa setWindowFrameMargins(), getWindowFrameMargins(), windowFrameRect() */ void QGraphicsWidget::unsetWindowFrameMargins() { Q_D(QGraphicsWidget); if ((d->windowFlags & Qt::Window) && (d->windowFlags & Qt::WindowType_Mask) != Qt::Popup && (d->windowFlags & Qt::WindowType_Mask) != Qt::ToolTip && !(d->windowFlags & Qt::FramelessWindowHint)) { QStyleOptionTitleBar bar; d->initStyleOptionTitleBar(&bar); QStyle *style = this->style(); qreal margin = style->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth); qreal titleBarHeight = d->titleBarHeight(bar); setWindowFrameMargins(margin, titleBarHeight, margin, margin); } else { setWindowFrameMargins(0, 0, 0, 0); } d->setWindowFrameMargins = false; } /*! Returns the widget's geometry in parent coordinates including any window frame. \sa windowFrameRect(), getWindowFrameMargins(), setWindowFrameMargins() */ QRectF QGraphicsWidget::windowFrameGeometry() const { Q_D(const QGraphicsWidget); return d->windowFrameMargins ? geometry().adjusted(-d->windowFrameMargins[d->Left], -d->windowFrameMargins[d->Top], d->windowFrameMargins[d->Right], d->windowFrameMargins[d->Bottom]) : geometry(); } /*! Returns the widget's local rect including any window frame. \sa windowFrameGeometry(), getWindowFrameMargins(), setWindowFrameMargins() */ QRectF QGraphicsWidget::windowFrameRect() const { Q_D(const QGraphicsWidget); return d->windowFrameMargins ? rect().adjusted(-d->windowFrameMargins[d->Left], -d->windowFrameMargins[d->Top], d->windowFrameMargins[d->Right], d->windowFrameMargins[d->Bottom]) : rect(); } /*! Populates a style option object for this widget based on its current state, and stores the output in \a option. The default implementation populates \a option with the following properties. \table \header \o Style Option Property \o Value \row \o state & QStyle::State_Enabled \o Corresponds to QGraphicsItem::isEnabled(). \row \o state & QStyle::State_HasFocus \o Corresponds to QGraphicsItem::hasFocus(). \row \o state & QStyle::State_MouseOver \o Corresponds to QGraphicsItem::isUnderMouse(). \row \o direction \o Corresponds to QGraphicsWidget::layoutDirection(). \row \o rect \o Corresponds to QGraphicsWidget::rect().toRect(). \row \o palette \o Corresponds to QGraphicsWidget::palette(). \row \o fontMetrics \o Corresponds to QFontMetrics(QGraphicsWidget::font()). \endtable Subclasses of QGraphicsWidget should call the base implementation, and then test the type of \a option using qstyleoption_cast<>() or test QStyleOption::Type before storing widget-specific options. For example: \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 0 \sa QStyleOption::initFrom() */ void QGraphicsWidget::initStyleOption(QStyleOption *option) const { Q_ASSERT(option); option->state = QStyle::State_None; if (isEnabled()) option->state |= QStyle::State_Enabled; if (hasFocus()) option->state |= QStyle::State_HasFocus; // if (window->testAttribute(Qt::WA_KeyboardFocusChange)) // ### Window // option->state |= QStyle::State_KeyboardFocusChange; if (isUnderMouse()) option->state |= QStyle::State_MouseOver; if (QGraphicsWidget *w = window()) { if (w->isActiveWindow()) option->state |= QStyle::State_Active; } if (isWindow()) option->state |= QStyle::State_Window; /* ### #ifdef Q_WS_MAC extern bool qt_mac_can_clickThrough(const QGraphicsWidget *w); //qwidget_mac.cpp if (!(option->state & QStyle::State_Active) && !qt_mac_can_clickThrough(widget)) option->state &= ~QStyle::State_Enabled; switch (QMacStyle::widgetSizePolicy(widget)) { case QMacStyle::SizeSmall: option->state |= QStyle::State_Small; break; case QMacStyle::SizeMini: option->state |= QStyle::State_Mini; break; default: ; } #endif #ifdef QT_KEYPAD_NAVIGATION if (widget->hasEditFocus()) state |= QStyle::State_HasEditFocus; #endif */ option->direction = layoutDirection(); option->rect = rect().toRect(); // ### truncation! option->palette = palette(); if (!isEnabled()) { option->palette.setCurrentColorGroup(QPalette::Disabled); } else if (isActiveWindow()) { option->palette.setCurrentColorGroup(QPalette::Active); } else { option->palette.setCurrentColorGroup(QPalette::Inactive); } option->fontMetrics = QFontMetrics(font()); } /*! \reimp */ QSizeF QGraphicsWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const { Q_D(const QGraphicsWidget); QSizeF sh; if (d->layout) { QSizeF marginSize(0,0); if (d->margins) { marginSize = QSizeF(d->margins[d->Left] + d->margins[d->Right], d->margins[d->Top] + d->margins[d->Bottom]); } sh = d->layout->effectiveSizeHint(which, constraint - marginSize); sh += marginSize; } else { switch (which) { case Qt::MinimumSize: sh = QSizeF(0, 0); break; case Qt::PreferredSize: sh = QSizeF(50, 50); //rather arbitrary break; case Qt::MaximumSize: sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX); break; default: qWarning("QGraphicsWidget::sizeHint(): Don't know how to handle the value of 'which'"); break; } } return sh; } /*! Returns this widget's layout, or 0 if no layout is currently managing this widget. \sa setLayout() */ QGraphicsLayout *QGraphicsWidget::layout() const { Q_D(const QGraphicsWidget); return d->layout; } /*! \fn void QGraphicsWidget::setLayout(QGraphicsLayout *layout) Sets the layout for this widget to \a layout. Any existing layout manager is deleted before the new layout is assigned. If \a layout is 0, the widget is left without a layout. Existing subwidgets' geometries will remain unaffected. All widgets that are currently managed by \a layout or all of its sublayouts, are automatically reparented to this item. The layout is then invalidated, and the child widget geometries are adjusted according to this item's geometry() and contentsMargins(). Children who are not explicitly managed by \a layout remain unaffected by the layout after it has been assigned to this widget. QGraphicsWidget takes ownership of \a layout. \sa layout(), QGraphicsLinearLayout::addItem(), QGraphicsLayout::invalidate() */ void QGraphicsWidget::setLayout(QGraphicsLayout *l) { Q_D(QGraphicsWidget); if (d->layout == l) return; d->setLayout_helper(l); if (!l) return; // Prevent assigning a layout that is already assigned to another widget. QGraphicsLayoutItem *oldParent = l->parentLayoutItem(); if (oldParent && oldParent != this) { qWarning("QGraphicsWidget::setLayout: Attempting to set a layout on %s" " \"%s\", when the layout already has a parent", metaObject()->className(), qPrintable(objectName())); return; } // Install and activate the layout. l->setParentLayoutItem(this); l->d_func()->reparentChildItems(this); l->invalidate(); emit layoutChanged(); } /*! Adjusts the size of the widget to its effective preferred size hint. This function is called implicitly when the item is shown for the first time. \sa effectiveSizeHint(), Qt::MinimumSize */ void QGraphicsWidget::adjustSize() { QSizeF sz = effectiveSizeHint(Qt::PreferredSize); // What if sz is not valid?! if (sz.isValid()) resize(sz); } /*! \property QGraphicsWidget::layoutDirection \brief the layout direction for this widget. This property modifies this widget's and all of its descendants' Qt::WA_RightToLeft attribute. It also sets this widget's Qt::WA_SetLayoutDirection attribute. The widget's layout direction determines the order in which the layout manager horizontally arranges subwidgets of this widget. The default value depends on the language and locale of the application, and is typically in the same direction as words are read and written. With Qt::LeftToRight, the layout starts placing subwidgets from the left side of this widget towards the right. Qt::RightToLeft does the opposite - the layout will place widgets starting from the right edge moving towards the left. Subwidgets inherit their layout direction from the parent. Top-level widget items inherit their layout direction from QGraphicsScene::layoutDirection. If you change a widget's layout direction by calling setLayoutDirection(), the widget will send itself a \l{QEvent::LayoutDirectionChange}{LayoutDirectionChange} event, and then propagate the new layout direction to all its descendants. \sa QWidget::layoutDirection, QApplication::layoutDirection */ Qt::LayoutDirection QGraphicsWidget::layoutDirection() const { return testAttribute(Qt::WA_RightToLeft) ? Qt::RightToLeft : Qt::LeftToRight; } void QGraphicsWidget::setLayoutDirection(Qt::LayoutDirection direction) { Q_D(QGraphicsWidget); setAttribute(Qt::WA_SetLayoutDirection, true); d->setLayoutDirection_helper(direction); } void QGraphicsWidget::unsetLayoutDirection() { Q_D(QGraphicsWidget); setAttribute(Qt::WA_SetLayoutDirection, false); d->resolveLayoutDirection(); } /*! Returns a pointer to the widget's style. If this widget does not have any explicitly assigned style, the scene's style is returned instead. In turn, if the scene does not have any assigned style, this function returns QApplication::style(). \sa setStyle() */ QStyle *QGraphicsWidget::style() const { if (QStyle *style = widgetStyles()->styleForWidget(this)) return style; // ### This is not thread-safe. QApplication::style() is not thread-safe. return scene() ? scene()->style() : QApplication::style(); } /*! Sets the widget's style to \a style. QGraphicsWidget does \e not take ownership of \a style. If no style is assigned, or \a style is 0, the widget will use QGraphicsScene::style() (if this has been set). Otherwise the widget will use QApplication::style(). This function sets the Qt::WA_SetStyle attribute if \a style is not 0; otherwise it clears the attribute. \sa style() */ void QGraphicsWidget::setStyle(QStyle *style) { setAttribute(Qt::WA_SetStyle, style != 0); widgetStyles()->setStyleForWidget(this, style); // Deliver StyleChange to the widget itself (doesn't propagate). QEvent event(QEvent::StyleChange); QApplication::sendEvent(this, &event); } /*! \property QGraphicsWidget::font \brief the widgets' font This property provides the widget's font. QFont consists of font properties that have been explicitly defined and properties implicitly inherited from the widget's parent. Hence, font() can return a different font compared to the one set with setFont(). This scheme allows you to define single entries in a font without affecting the font's inherited entries. When a widget's font changes, it resolves its entries against its parent widget. If the widget does not have a parent widget, it resolves its entries against the scene. The widget then sends itself a \l{QEvent::FontChange}{FontChange} event and notifies all its descendants so that they can resolve their fonts as well. By default, this property contains the application's default font. \sa QApplication::font(), QGraphicsScene::font, QFont::resolve() */ QFont QGraphicsWidget::font() const { Q_D(const QGraphicsWidget); return d->font; } void QGraphicsWidget::setFont(const QFont &font) { Q_D(QGraphicsWidget); setAttribute(Qt::WA_SetFont, font.resolve() != 0); QFont naturalFont = d->naturalWidgetFont(); QFont resolvedFont = font.resolve(naturalFont); d->setFont_helper(resolvedFont); } /*! \property QGraphicsWidget::palette \brief the widget's palette This property provides the widget's palette. The palette provides colors and brushes for color groups (e.g., QPalette::Button) and states (e.g., QPalette::Inactive), loosely defining the general look of the widget and its children. QPalette consists of color groups that have been explicitly defined, and groups that are implicitly inherited from the widget's parent. Because of this, palette() can return a different palette than what has been set with setPalette(). This scheme allows you to define single entries in a palette without affecting the palette's inherited entries. When a widget's palette changes, it resolves its entries against its parent widget, or if it doesn't have a parent widget, it resolves against the scene. It then sends itself a \l{QEvent::PaletteChange}{PaletteChange} event, and notifies all its descendants so they can resolve their palettes as well. By default, this property contains the application's default palette. \sa QApplication::palette(), QGraphicsScene::palette, QPalette::resolve() */ QPalette QGraphicsWidget::palette() const { Q_D(const QGraphicsWidget); return d->palette; } void QGraphicsWidget::setPalette(const QPalette &palette) { Q_D(QGraphicsWidget); setAttribute(Qt::WA_SetPalette, palette.resolve() != 0); QPalette naturalPalette = d->naturalWidgetPalette(); QPalette resolvedPalette = palette.resolve(naturalPalette); d->setPalette_helper(resolvedPalette); } /*! \property QGraphicsWidget::autoFillBackground \brief whether the widget background is filled automatically \since 4.7 If enabled, this property will cause Qt to fill the background of the widget before invoking the paint() method. The color used is defined by the QPalette::Window color role from the widget's \l{QPalette}{palette}. In addition, Windows are always filled with QPalette::Window, unless the WA_OpaquePaintEvent or WA_NoSystemBackground attributes are set. By default, this property is false. \sa Qt::WA_OpaquePaintEvent, Qt::WA_NoSystemBackground, */ bool QGraphicsWidget::autoFillBackground() const { Q_D(const QGraphicsWidget); return d->autoFillBackground; } void QGraphicsWidget::setAutoFillBackground(bool enabled) { Q_D(QGraphicsWidget); if (d->autoFillBackground != enabled) { d->autoFillBackground = enabled; update(); } } /*! If this widget is currently managed by a layout, this function notifies the layout that the widget's size hints have changed and the layout may need to resize and reposition the widget accordingly. Call this function if the widget's sizeHint() has changed. \sa QGraphicsLayout::invalidate() */ void QGraphicsWidget::updateGeometry() { QGraphicsLayoutItem::updateGeometry(); QGraphicsLayoutItem *parentItem = parentLayoutItem(); if (parentItem && parentItem->isLayout()) { parentItem->updateGeometry(); } else { if (parentItem) { QGraphicsWidget *parentWid = parentWidget(); //### if (parentWid->isVisible()) QApplication::postEvent(parentWid, new QEvent(QEvent::LayoutRequest)); } bool wasResized = testAttribute(Qt::WA_Resized); resize(size()); // this will restrict the size setAttribute(Qt::WA_Resized, wasResized); } } /*! \reimp QGraphicsWidget uses the base implementation of this function to catch and deliver events related to state changes in the item. Because of this, it is very important that subclasses call the base implementation. \a change specifies the type of change, and \a value is the new value. For example, QGraphicsWidget uses ItemVisibleChange to deliver \l{QEvent::Show} {Show} and \l{QEvent::Hide}{Hide} events, ItemPositionHasChanged to deliver \l{QEvent::Move}{Move} events, and ItemParentChange both to deliver \l{QEvent::ParentChange} {ParentChange} events, and for managing the focus chain. QGraphicsWidget enables the ItemSendsGeometryChanges flag by default in order to track position changes. \sa QGraphicsItem::itemChange() */ QVariant QGraphicsWidget::itemChange(GraphicsItemChange change, const QVariant &value) { Q_D(QGraphicsWidget); switch (change) { case ItemEnabledHasChanged: { // Send EnabledChange after the enabled state has changed. QEvent event(QEvent::EnabledChange); QApplication::sendEvent(this, &event); break; } case ItemVisibleChange: if (value.toBool()) { // Send Show event before the item has been shown. QShowEvent event; QApplication::sendEvent(this, &event); bool resized = testAttribute(Qt::WA_Resized); if (!resized) { adjustSize(); setAttribute(Qt::WA_Resized, false); } } break; case ItemVisibleHasChanged: if (!value.toBool()) { // Send Hide event after the item has been hidden. QHideEvent event; QApplication::sendEvent(this, &event); } break; case ItemPositionHasChanged: if (!d->inSetGeometry) { d->inSetPos = 1; // Ensure setGeometry is called (avoid recursion when setPos is // called from within setGeometry). setGeometry(QRectF(pos(), size())); d->inSetPos = 0 ; } break; case ItemParentChange: { QGraphicsItem *parent = qVariantValue(value); d->fixFocusChainBeforeReparenting((parent && parent->isWidget()) ? static_cast(parent) : 0, scene()); // Deliver ParentAboutToChange. QEvent event(QEvent::ParentAboutToChange); QApplication::sendEvent(this, &event); break; } case ItemParentHasChanged: { // Deliver ParentChange. QEvent event(QEvent::ParentChange); QApplication::sendEvent(this, &event); break; } case ItemCursorHasChanged: { // Deliver CursorChange. QEvent event(QEvent::CursorChange); QApplication::sendEvent(this, &event); break; } case ItemToolTipHasChanged: { // Deliver ToolTipChange. QEvent event(QEvent::ToolTipChange); QApplication::sendEvent(this, &event); break; } default: break; } return QGraphicsItem::itemChange(change, value); } /*! \internal This virtual function is used to notify changes to any property (both dynamic properties, and registered with Q_PROPERTY) in the widget. Depending on the property itself, the notification can be delivered before or after the value has changed. \a propertyName is the name of the property (e.g., "size" or "font"), and \a value is the (proposed) new value of the property. The function returns the new value, which may be different from \a value if the notification supports adjusting the property value. The base implementation simply returns \a value for any \a propertyName. QGraphicsWidget delivers notifications for the following properties: \table \o propertyName \o Property \row \o layoutDirection \o QGraphicsWidget::layoutDirection \row \o size \o QGraphicsWidget::size \row \o font \o QGraphicsWidget::font \row \o palette \o QGraphicsWidget::palette \endtable \sa itemChange() */ QVariant QGraphicsWidget::propertyChange(const QString &propertyName, const QVariant &value) { Q_UNUSED(propertyName); return value; } /*! QGraphicsWidget's implementation of sceneEvent() simply passes \a event to QGraphicsWidget::event(). You can handle all events for your widget in event() or in any of the convenience functions; you should not have to reimplement this function in a subclass of QGraphicsWidget. \sa QGraphicsItem::sceneEvent() */ bool QGraphicsWidget::sceneEvent(QEvent *event) { return QGraphicsItem::sceneEvent(event); } /*! This event handler, for \a event, receives events for the window frame if this widget is a window. Its base implementation provides support for default window frame interaction such as moving, resizing, etc. You can reimplement this handler in a subclass of QGraphicsWidget to provide your own custom window frame interaction support. Returns true if \a event has been recognized and processed; otherwise, returns false. \sa event() */ bool QGraphicsWidget::windowFrameEvent(QEvent *event) { Q_D(QGraphicsWidget); switch (event->type()) { case QEvent::GraphicsSceneMousePress: d->windowFrameMousePressEvent(static_cast(event)); break; case QEvent::GraphicsSceneMouseMove: d->ensureWindowData(); if (d->windowData->grabbedSection != Qt::NoSection) { d->windowFrameMouseMoveEvent(static_cast(event)); event->accept(); } break; case QEvent::GraphicsSceneMouseRelease: d->windowFrameMouseReleaseEvent(static_cast(event)); break; case QEvent::GraphicsSceneHoverMove: d->windowFrameHoverMoveEvent(static_cast(event)); break; case QEvent::GraphicsSceneHoverLeave: d->windowFrameHoverLeaveEvent(static_cast(event)); break; default: break; } return event->isAccepted(); } /*! \since 4.4 Returns the window frame section at position \a pos, or Qt::NoSection if there is no window frame section at this position. This function is used in QGraphicsWidget's base implementation for window frame interaction. You can reimplement this function if you want to customize how a window can be interactively moved or resized. For instance, if you only want to allow a window to be resized by the bottom right corner, you can reimplement this function to return Qt::NoSection for all sections except Qt::BottomRightSection. \sa windowFrameEvent(), paintWindowFrame(), windowFrameGeometry() */ Qt::WindowFrameSection QGraphicsWidget::windowFrameSectionAt(const QPointF &pos) const { Q_D(const QGraphicsWidget); const QRectF r = windowFrameRect(); if (!r.contains(pos)) return Qt::NoSection; const qreal left = r.left(); const qreal top = r.top(); const qreal right = r.right(); const qreal bottom = r.bottom(); const qreal x = pos.x(); const qreal y = pos.y(); const qreal cornerMargin = 20; //### Not sure of this one, it should be the same value for all edges. const qreal windowFrameWidth = d->windowFrameMargins ? d->windowFrameMargins[d->Left] : 0; Qt::WindowFrameSection s = Qt::NoSection; if (x <= left + cornerMargin) { if (y <= top + windowFrameWidth || (x <= left + windowFrameWidth && y <= top + cornerMargin)) { s = Qt::TopLeftSection; } else if (y >= bottom - windowFrameWidth || (x <= left + windowFrameWidth && y >= bottom - windowFrameWidth)) { s = Qt::BottomLeftSection; } else if (x <= left + windowFrameWidth) { s = Qt::LeftSection; } } else if (x >= right - cornerMargin) { if (y <= top + windowFrameWidth || (x >= right - windowFrameWidth && y <= top + cornerMargin)) { s = Qt::TopRightSection; } else if (y >= bottom - windowFrameWidth || (x >= right - windowFrameWidth && y >= bottom - windowFrameWidth)) { s = Qt::BottomRightSection; } else if (x >= right - windowFrameWidth) { s = Qt::RightSection; } } else if (y <= top + windowFrameWidth) { s = Qt::TopSection; } else if (y >= bottom - windowFrameWidth) { s = Qt::BottomSection; } if (s == Qt::NoSection) { QRectF r1 = r; r1.setHeight(d->windowFrameMargins ? d->windowFrameMargins[d->Top] : 0); if (r1.contains(pos)) s = Qt::TitleBarArea; } return s; } /*! \reimp Handles the \a event. QGraphicsWidget handles the following events: \table \o Event \o Usage \row \o Polish \o Delivered to the widget some time after it has been shown. \row \o GraphicsSceneMove \o Delivered to the widget after its local position has changed. \row \o GraphicsSceneResize \o Delivered to the widget after its size has changed. \row \o Show \o Delivered to the widget before it has been shown. \row \o Hide \o Delivered to the widget after it has been hidden. \row \o PaletteChange \o Delivered to the widget after its palette has changed. \row \o FontChange \o Delivered to the widget after its font has changed. \row \o EnabledChange \o Delivered to the widget after its enabled state has changed. \row \o StyleChange \o Delivered to the widget after its style has changed. \row \o LayoutDirectionChange \o Delivered to the widget after its layout direction has changed. \row \o ContentsRectChange \o Delivered to the widget after its contents margins/ contents rect has changed. \endtable */ bool QGraphicsWidget::event(QEvent *event) { Q_D(QGraphicsWidget); // Forward the event to the layout first. if (d->layout) d->layout->widgetEvent(event); // Handle the event itself. switch (event->type()) { case QEvent::GraphicsSceneMove: moveEvent(static_cast(event)); break; case QEvent::GraphicsSceneResize: resizeEvent(static_cast(event)); break; case QEvent::Show: showEvent(static_cast(event)); break; case QEvent::Hide: hideEvent(static_cast(event)); break; case QEvent::Polish: polishEvent(); d->polished = true; if (!d->font.isCopyOf(QApplication::font())) d->updateFont(d->font); break; case QEvent::WindowActivate: case QEvent::WindowDeactivate: update(); break; // Taken from QWidget::event case QEvent::ActivationChange: case QEvent::EnabledChange: case QEvent::FontChange: case QEvent::StyleChange: case QEvent::PaletteChange: case QEvent::ParentChange: case QEvent::ContentsRectChange: case QEvent::LayoutDirectionChange: changeEvent(event); break; case QEvent::Close: closeEvent((QCloseEvent *)event); break; case QEvent::GrabMouse: grabMouseEvent(event); break; case QEvent::UngrabMouse: ungrabMouseEvent(event); break; case QEvent::GrabKeyboard: grabKeyboardEvent(event); break; case QEvent::UngrabKeyboard: ungrabKeyboardEvent(event); break; case QEvent::GraphicsSceneMousePress: if (d->hasDecoration() && windowFrameEvent(event)) return true; case QEvent::GraphicsSceneMouseMove: case QEvent::GraphicsSceneMouseRelease: case QEvent::GraphicsSceneMouseDoubleClick: d->ensureWindowData(); if (d->hasDecoration() && d->windowData->grabbedSection != Qt::NoSection) return windowFrameEvent(event); break; case QEvent::GraphicsSceneHoverEnter: case QEvent::GraphicsSceneHoverMove: case QEvent::GraphicsSceneHoverLeave: if (d->hasDecoration()) { windowFrameEvent(event); // Filter out hover events if they were sent to us only because of the // decoration (special case in QGraphicsScenePrivate::dispatchHoverEvent). if (!acceptsHoverEvents()) return true; } break; default: break; } return QObject::event(event); } /*! This event handler can be reimplemented to handle state changes. The state being changed in this event can be retrieved through \a event. Change events include: QEvent::ActivationChange, QEvent::EnabledChange, QEvent::FontChange, QEvent::StyleChange, QEvent::PaletteChange, QEvent::ParentChange, QEvent::LayoutDirectionChange, and QEvent::ContentsRectChange. */ void QGraphicsWidget::changeEvent(QEvent *event) { Q_D(QGraphicsWidget); switch (event->type()) { case QEvent::StyleChange: // ### Don't unset if the margins are explicitly set. unsetWindowFrameMargins(); if (d->layout) d->layout->invalidate(); case QEvent::FontChange: update(); updateGeometry(); break; case QEvent::PaletteChange: update(); break; case QEvent::ParentChange: d->resolveFont(d->inheritedFontResolveMask); d->resolvePalette(d->inheritedPaletteResolveMask); break; default: break; } } /*! This event handler, for \a event, can be reimplemented in a subclass to receive widget close events. The default implementation accepts the event. \sa close(), QCloseEvent */ void QGraphicsWidget::closeEvent(QCloseEvent *event) { event->accept(); } /*! \reimp */ void QGraphicsWidget::focusInEvent(QFocusEvent *event) { Q_UNUSED(event); if (focusPolicy() != Qt::NoFocus) update(); } /*! Finds a new widget to give the keyboard focus to, as appropriate for Tab and Shift+Tab, and returns true if it can find a new widget; returns false otherwise. If \a next is true, this function searches forward; if \a next is false, it searches backward. Sometimes, you will want to reimplement this function to provide special focus handling for your widget and its subwidgets. For example, a web browser might reimplement it to move its current active link forward or backward, and call the base implementation only when it reaches the last or first link on the page. Child widgets call focusNextPrevChild() on their parent widgets, but only the window that contains the child widgets decides where to redirect focus. By reimplementing this function for an object, you gain control of focus traversal for all child widgets. \sa focusPolicy() */ bool QGraphicsWidget::focusNextPrevChild(bool next) { Q_D(QGraphicsWidget); // Let the parent's focusNextPrevChild implementation decide what to do. QGraphicsWidget *parent = 0; if (!isWindow() && (parent = parentWidget())) return parent->focusNextPrevChild(next); if (!d->scene) return false; if (d->scene->focusNextPrevChild(next)) return true; if (isWindow()) { setFocus(next ? Qt::TabFocusReason : Qt::BacktabFocusReason); if (hasFocus()) return true; } return false; } /*! \reimp */ void QGraphicsWidget::focusOutEvent(QFocusEvent *event) { Q_UNUSED(event); if (focusPolicy() != Qt::NoFocus) update(); } /*! This event handler, for \l{QEvent::Hide}{Hide} events, is delivered after the widget has been hidden, for example, setVisible(false) has been called for the widget or one of its ancestors when the widget was previously shown. You can reimplement this event handler to detect when your widget is hidden. Calling QEvent::accept() or QEvent::ignore() on \a event has no effect. \sa showEvent(), QWidget::hideEvent(), ItemVisibleChange */ void QGraphicsWidget::hideEvent(QHideEvent *event) { ///### focusNextPrevChild(true), don't lose focus when the focus widget // is hidden. Q_UNUSED(event); } /*! This event handler, for \l{QEvent::GraphicsSceneMove}{GraphicsSceneMove} events, is delivered after the widget has moved (e.g., its local position has changed). This event is only delivered when the item is moved locally. Calling setTransform() or moving any of the item's ancestors does not affect the item's local position. You can reimplement this event handler to detect when your widget has moved. Calling QEvent::accept() or QEvent::ignore() on \a event has no effect. \sa ItemPositionChange, ItemPositionHasChanged */ void QGraphicsWidget::moveEvent(QGraphicsSceneMoveEvent *event) { // ### Last position is always == current position Q_UNUSED(event); } /*! This event is delivered to the item by the scene at some point after it has been constructed, but before it is shown or otherwise accessed through the scene. You can use this event handler to do last-minute initializations of the widget which require the item to be fully constructed. The base implementation does nothing. */ void QGraphicsWidget::polishEvent() { } /*! This event handler, for \l{QEvent::GraphicsSceneResize}{GraphicsSceneResize} events, is delivered after the widget has been resized (i.e., its local size has changed). \a event contains both the old and the new size. This event is only delivered when the widget is resized locally; calling setTransform() on the widget or any of its ancestors or view, does not affect the widget's local size. You can reimplement this event handler to detect when your widget has been resized. Calling QEvent::accept() or QEvent::ignore() on \a event has no effect. \sa geometry(), setGeometry() */ void QGraphicsWidget::resizeEvent(QGraphicsSceneResizeEvent *event) { Q_UNUSED(event); } /*! This event handler, for \l{QEvent::Show}{Show} events, is delivered before the widget has been shown, for example, setVisible(true) has been called for the widget or one of its ancestors when the widget was previously hidden. You can reimplement this event handler to detect when your widget is shown. Calling QEvent::accept() or QEvent::ignore() on \a event has no effect. \sa hideEvent(), QWidget::showEvent(), ItemVisibleChange */ void QGraphicsWidget::showEvent(QShowEvent *event) { Q_UNUSED(event); } /*! \reimp */ void QGraphicsWidget::hoverMoveEvent(QGraphicsSceneHoverEvent *event) { Q_UNUSED(event); } /*! \reimp */ void QGraphicsWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) { Q_UNUSED(event); } /*! This event handler, for \a event, can be reimplemented in a subclass to receive notifications for Qt::GrabMouse events. \sa grabMouse(), grabKeyboard() */ void QGraphicsWidget::grabMouseEvent(QEvent *event) { Q_UNUSED(event); } /*! This event handler, for \a event, can be reimplemented in a subclass to receive notifications for Qt::UngrabMouse events. \sa ungrabMouse(), ungrabKeyboard() */ void QGraphicsWidget::ungrabMouseEvent(QEvent *event) { Q_UNUSED(event); } /*! This event handler, for \a event, can be reimplemented in a subclass to receive notifications for Qt::GrabKeyboard events. \sa grabKeyboard(), grabMouse() */ void QGraphicsWidget::grabKeyboardEvent(QEvent *event) { Q_UNUSED(event); } /*! This event handler, for \a event, can be reimplemented in a subclass to receive notifications for Qt::UngrabKeyboard events. \sa ungrabKeyboard(), ungrabMouse() */ void QGraphicsWidget::ungrabKeyboardEvent(QEvent *event) { Q_UNUSED(event); } /*! Returns the widgets window type. \sa windowFlags(), isWindow(), isPanel() */ Qt::WindowType QGraphicsWidget::windowType() const { return Qt::WindowType(int(windowFlags()) & Qt::WindowType_Mask); } /*! \property QGraphicsWidget::windowFlags \brief the widget's window flags Window flags are a combination of a window type (e.g., Qt::Dialog) and several flags giving hints on the behavior of the window. The behavior is platform-dependent. By default, this property contains no window flags. Windows are panels. If you set the Qt::Window flag, the ItemIsPanel flag will be set automatically. If you clear the Qt::Window flag, the ItemIsPanel flag is also cleared. Note that the ItemIsPanel flag can be set independently of Qt::Window. \sa isWindow(), isPanel() */ Qt::WindowFlags QGraphicsWidget::windowFlags() const { Q_D(const QGraphicsWidget); return d->windowFlags; } void QGraphicsWidget::setWindowFlags(Qt::WindowFlags wFlags) { Q_D(QGraphicsWidget); if (d->windowFlags == wFlags) return; bool wasPopup = (d->windowFlags & Qt::WindowType_Mask) == Qt::Popup; d->adjustWindowFlags(&wFlags); d->windowFlags = wFlags; if (!d->setWindowFrameMargins) unsetWindowFrameMargins(); setFlag(ItemIsPanel, d->windowFlags & Qt::Window); bool isPopup = (d->windowFlags & Qt::WindowType_Mask) == Qt::Popup; if (d->scene && isVisible() && wasPopup != isPopup) { // Popup state changed; update implicit mouse grab. if (!isPopup) d->scene->d_func()->removePopup(this); else d->scene->d_func()->addPopup(this); } if (d->scene && d->scene->d_func()->allItemsIgnoreHoverEvents && d->hasDecoration()) { d->scene->d_func()->allItemsIgnoreHoverEvents = false; d->scene->d_func()->enableMouseTrackingOnViews(); } } /*! Returns true if this widget's window is in the active window, or if the widget does not have a window but is in an active scene (i.e., a scene that currently has focus). The active window is the window that either contains a child widget that currently has input focus, or that itself has input focus. \sa QGraphicsScene::activeWindow(), QGraphicsScene::setActiveWindow(), isActive() */ bool QGraphicsWidget::isActiveWindow() const { return isActive(); } /*! \property QGraphicsWidget::windowTitle \brief This property holds the window title (caption). This property is only used for windows. By default, if no title has been set, this property contains an empty string. */ void QGraphicsWidget::setWindowTitle(const QString &title) { Q_D(QGraphicsWidget); d->ensureWindowData(); d->windowData->windowTitle = title; } QString QGraphicsWidget::windowTitle() const { Q_D(const QGraphicsWidget); return d->windowData ? d->windowData->windowTitle : QString(); } /*! \property QGraphicsWidget::focusPolicy \brief the way the widget accepts keyboard focus The focus policy is Qt::TabFocus if the widget accepts keyboard focus by tabbing, Qt::ClickFocus if the widget accepts focus by clicking, Qt::StrongFocus if it accepts both, and Qt::NoFocus (the default) if it does not accept focus at all. You must enable keyboard focus for a widget if it processes keyboard events. This is normally done from the widget's constructor. For instance, the QLineEdit constructor calls setFocusPolicy(Qt::StrongFocus). If you enable a focus policy (i.e., not Qt::NoFocus), QGraphicsWidget will automatically enable the ItemIsFocusable flag. Setting Qt::NoFocus on a widget will clear the ItemIsFocusable flag. If the widget currently has keyboard focus, the widget will automatically lose focus. \sa focusInEvent(), focusOutEvent(), keyPressEvent(), keyReleaseEvent(), enabled */ Qt::FocusPolicy QGraphicsWidget::focusPolicy() const { Q_D(const QGraphicsWidget); return d->focusPolicy; } void QGraphicsWidget::setFocusPolicy(Qt::FocusPolicy policy) { Q_D(QGraphicsWidget); if (d->focusPolicy == policy) return; d->focusPolicy = policy; if (hasFocus() && policy == Qt::NoFocus) clearFocus(); setFlag(ItemIsFocusable, policy != Qt::NoFocus); } /*! If this widget, a child or descendant of this widget currently has input focus, this function will return a pointer to that widget. If no descendant widget has input focus, 0 is returned. \sa QGraphicsItem::focusItem(), QWidget::focusWidget() */ QGraphicsWidget *QGraphicsWidget::focusWidget() const { Q_D(const QGraphicsWidget); if (d->subFocusItem && d->subFocusItem->d_ptr->isWidget) return static_cast(d->subFocusItem); return 0; } #ifndef QT_NO_SHORTCUT /*! \since 4.5 Adds a shortcut to Qt's shortcut system that watches for the given key \a sequence in the given \a context. If the \a context is Qt::ApplicationShortcut, the shortcut applies to the application as a whole. Otherwise, it is either local to this widget, Qt::WidgetShortcut, or to the window itself, Qt::WindowShortcut. For widgets that are not part of a window (i.e., top-level widgets and their children), Qt::WindowShortcut shortcuts apply to the scene. If the same key \a sequence has been grabbed by several widgets, when the key \a sequence occurs a QEvent::Shortcut event is sent to all the widgets to which it applies in a non-deterministic order, but with the ``ambiguous'' flag set to true. \warning You should not normally need to use this function; instead create \l{QAction}s with the shortcut key sequences you require (if you also want equivalent menu options and toolbar buttons), or create \l{QShortcut}s if you just need key sequences. Both QAction and QShortcut handle all the event filtering for you, and provide signals which are triggered when the user triggers the key sequence, so are much easier to use than this low-level function. \sa releaseShortcut() setShortcutEnabled() QWidget::grabShortcut() */ int QGraphicsWidget::grabShortcut(const QKeySequence &sequence, Qt::ShortcutContext context) { Q_ASSERT(qApp); if (sequence.isEmpty()) return 0; // ### setAttribute(Qt::WA_GrabbedShortcut); return qApp->d_func()->shortcutMap.addShortcut(this, sequence, context); } /*! \since 4.5 Removes the shortcut with the given \a id from Qt's shortcut system. The widget will no longer receive QEvent::Shortcut events for the shortcut's key sequence (unless it has other shortcuts with the same key sequence). \warning You should not normally need to use this function since Qt's shortcut system removes shortcuts automatically when their parent widget is destroyed. It is best to use QAction or QShortcut to handle shortcuts, since they are easier to use than this low-level function. Note also that this is an expensive operation. \sa grabShortcut() setShortcutEnabled() , QWidget::releaseShortcut() */ void QGraphicsWidget::releaseShortcut(int id) { Q_ASSERT(qApp); if (id) qApp->d_func()->shortcutMap.removeShortcut(id, this, 0); } /*! \since 4.5 If \a enabled is true, the shortcut with the given \a id is enabled; otherwise the shortcut is disabled. \warning You should not normally need to use this function since Qt's shortcut system enables/disables shortcuts automatically as widgets become hidden/visible and gain or lose focus. It is best to use QAction or QShortcut to handle shortcuts, since they are easier to use than this low-level function. \sa grabShortcut() releaseShortcut(), QWidget::setShortcutEnabled() */ void QGraphicsWidget::setShortcutEnabled(int id, bool enabled) { Q_ASSERT(qApp); if (id) qApp->d_func()->shortcutMap.setShortcutEnabled(enabled, id, this, 0); } /*! \since 4.5 If \a enabled is true, auto repeat of the shortcut with the given \a id is enabled; otherwise it is disabled. \sa grabShortcut() releaseShortcut() QWidget::setShortcutAutoRepeat() */ void QGraphicsWidget::setShortcutAutoRepeat(int id, bool enabled) { Q_ASSERT(qApp); if (id) qApp->d_func()->shortcutMap.setShortcutAutoRepeat(enabled, id, this, 0); } #endif #ifndef QT_NO_ACTION /*! \since 4.5 Appends the action \a action to this widget's list of actions. All QGraphicsWidgets have a list of \l{QAction}s, however they can be represented graphically in many different ways. The default use of the QAction list (as returned by actions()) is to create a context QMenu. A QGraphicsWidget should only have one of each action and adding an action it already has will not cause the same action to be in the widget twice. \sa removeAction(), insertAction(), actions(), QWidget::addAction() */ void QGraphicsWidget::addAction(QAction *action) { insertAction(0, action); } /*! \since 4.5 Appends the actions \a actions to this widget's list of actions. \sa removeAction(), QMenu, addAction(), QWidget::addActions() */ void QGraphicsWidget::addActions(QList actions) { for (int i = 0; i < actions.count(); ++i) insertAction(0, actions.at(i)); } /*! \since 4.5 Inserts the action \a action to this widget's list of actions, before the action \a before. It appends the action if \a before is 0 or \a before is not a valid action for this widget. A QGraphicsWidget should only have one of each action. \sa removeAction(), addAction(), QMenu, actions(), QWidget::insertActions() */ void QGraphicsWidget::insertAction(QAction *before, QAction *action) { if (!action) { qWarning("QWidget::insertAction: Attempt to insert null action"); return; } Q_D(QGraphicsWidget); int index = d->actions.indexOf(action); if (index != -1) d->actions.removeAt(index); int pos = d->actions.indexOf(before); if (pos < 0) { before = 0; pos = d->actions.size(); } d->actions.insert(pos, action); if (index == -1) { QActionPrivate *apriv = action->d_func(); apriv->graphicsWidgets.append(this); } QActionEvent e(QEvent::ActionAdded, action, before); QApplication::sendEvent(this, &e); } /*! \since 4.5 Inserts the actions \a actions to this widget's list of actions, before the action \a before. It appends the action if \a before is 0 or \a before is not a valid action for this widget. A QGraphicsWidget can have at most one of each action. \sa removeAction(), QMenu, insertAction(), QWidget::insertActions() */ void QGraphicsWidget::insertActions(QAction *before, QList actions) { for (int i = 0; i < actions.count(); ++i) insertAction(before, actions.at(i)); } /*! \since 4.5 Removes the action \a action from this widget's list of actions. \sa insertAction(), actions(), insertAction(), QWidget::removeAction() */ void QGraphicsWidget::removeAction(QAction *action) { if (!action) return; Q_D(QGraphicsWidget); QActionPrivate *apriv = action->d_func(); apriv->graphicsWidgets.removeAll(this); if (d->actions.removeAll(action)) { QActionEvent e(QEvent::ActionRemoved, action); QApplication::sendEvent(this, &e); } } /*! \since 4.5 Returns the (possibly empty) list of this widget's actions. \sa insertAction(), removeAction(), QWidget::actions(), QAction::associatedWidgets(), QAction::associatedGraphicsWidgets() */ QList QGraphicsWidget::actions() const { Q_D(const QGraphicsWidget); return d->actions; } #endif /*! Moves the \a second widget around the ring of focus widgets so that keyboard focus moves from the \a first widget to the \a second widget when the Tab key is pressed. Note that since the tab order of the \a second widget is changed, you should order a chain like this: \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 1 \e not like this: \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 2 If \a first is 0, this indicates that \a second should be the first widget to receive input focus should the scene gain Tab focus (i.e., the user hits Tab so that focus passes into the scene). If \a second is 0, this indicates that \a first should be the first widget to gain focus if the scene gained BackTab focus. By default, tab order is defined implicitly using widget creation order. \sa focusPolicy, {Keyboard Focus} */ void QGraphicsWidget::setTabOrder(QGraphicsWidget *first, QGraphicsWidget *second) { if (!first && !second) { qWarning("QGraphicsWidget::setTabOrder(0, 0) is undefined"); return; } if ((first && second) && first->scene() != second->scene()) { qWarning("QGraphicsWidget::setTabOrder: scenes %p and %p are different", first->scene(), second->scene()); return; } QGraphicsScene *scene = first ? first->scene() : second->scene(); if (!scene && (!first || !second)) { qWarning("QGraphicsWidget::setTabOrder: assigning tab order from/to the" " scene requires the item to be in a scene."); return; } // If either first or second are 0, the scene's tabFocusFirst is updated // to point to the first item in the scene's focus chain. Then first or // second are set to point to tabFocusFirst. QGraphicsScenePrivate *sceneD = scene->d_func(); if (!first) { sceneD->tabFocusFirst = second; return; } if (!second) { sceneD->tabFocusFirst = first->d_func()->focusNext; return; } // Both first and second are != 0. QGraphicsWidget *firstFocusNext = first->d_func()->focusNext; if (firstFocusNext == second) { // Nothing to do. return; } // Update the focus chain. QGraphicsWidget *secondFocusPrev = second->d_func()->focusPrev; QGraphicsWidget *secondFocusNext = second->d_func()->focusNext; firstFocusNext->d_func()->focusPrev = second; first->d_func()->focusNext = second; second->d_func()->focusNext = firstFocusNext; second->d_func()->focusPrev = first; secondFocusPrev->d_func()->focusNext = secondFocusNext; secondFocusNext->d_func()->focusPrev = secondFocusPrev; Q_ASSERT(first->d_func()->focusNext->d_func()->focusPrev == first); Q_ASSERT(first->d_func()->focusPrev->d_func()->focusNext == first); Q_ASSERT(second->d_func()->focusNext->d_func()->focusPrev == second); Q_ASSERT(second->d_func()->focusPrev->d_func()->focusNext == second); } /*! If \a on is true, this function enables \a attribute; otherwise \a attribute is disabled. See the class documentation for QGraphicsWidget for a complete list of which attributes are supported, and what they are for. \sa testAttribute(), QWidget::setAttribute() */ void QGraphicsWidget::setAttribute(Qt::WidgetAttribute attribute, bool on) { Q_D(QGraphicsWidget); // ### most flags require some immediate action // ### we might want to qWarn use of unsupported attributes // ### we might want to not use Qt::WidgetAttribute, but roll our own instead d->setAttribute(attribute, on); } /*! Returns true if \a attribute is enabled for this widget; otherwise, returns false. \sa setAttribute() */ bool QGraphicsWidget::testAttribute(Qt::WidgetAttribute attribute) const { Q_D(const QGraphicsWidget); return d->testAttribute(attribute); } /*! \reimp */ int QGraphicsWidget::type() const { return Type; } /*! \reimp */ void QGraphicsWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { Q_UNUSED(painter); Q_UNUSED(option); Q_UNUSED(widget); } /*! This virtual function is called by QGraphicsScene to draw the window frame for windows using \a painter, \a option, and \a widget, in local coordinates. The base implementation uses the current style to render the frame and title bar. You can reimplement this function in a subclass of QGraphicsWidget to provide custom rendering of the widget's window frame. \sa QGraphicsItem::paint() */ void QGraphicsWidget::paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { const bool fillBackground = !testAttribute(Qt::WA_OpaquePaintEvent) && !testAttribute(Qt::WA_NoSystemBackground); QGraphicsProxyWidget *proxy = qobject_cast(this); const bool embeddedWidgetFillsOwnBackground = proxy && proxy->widget(); if (rect().contains(option->exposedRect)) { if (fillBackground && !embeddedWidgetFillsOwnBackground) painter->fillRect(option->exposedRect, palette().window()); return; } Q_D(QGraphicsWidget); QRect windowFrameRect = QRect(QPoint(), windowFrameGeometry().size().toSize()); QStyleOptionTitleBar bar; bar.QStyleOption::operator=(*option); d->initStyleOptionTitleBar(&bar); // this clear flags in bar.state d->ensureWindowData(); if (d->windowData->buttonMouseOver) bar.state |= QStyle::State_MouseOver; else bar.state &= ~QStyle::State_MouseOver; if (d->windowData->buttonSunken) bar.state |= QStyle::State_Sunken; else bar.state &= ~QStyle::State_Sunken; bar.rect = windowFrameRect; // translate painter to make the style happy const QPointF styleOrigin = this->windowFrameRect().topLeft(); painter->translate(styleOrigin); #ifdef Q_WS_MAC const QSize pixmapSize = windowFrameRect.size(); if (pixmapSize.width() <= 0 || pixmapSize.height() <= 0) return; QPainter *realPainter = painter; QPixmap pm(pixmapSize); painter = new QPainter(&pm); #endif // Fill background QStyleHintReturnMask mask; bool setMask = style()->styleHint(QStyle::SH_WindowFrame_Mask, &bar, widget, &mask) && !mask.region.isEmpty(); bool hasBorder = !style()->styleHint(QStyle::SH_TitleBar_NoBorder, &bar, widget); int frameWidth = style()->pixelMetric(QStyle::PM_MDIFrameWidth, &bar, widget); if (setMask) { painter->save(); painter->setClipRegion(mask.region, Qt::IntersectClip); } if (fillBackground) { if (embeddedWidgetFillsOwnBackground) { // Don't fill the background twice. QPainterPath windowFrameBackground; windowFrameBackground.addRect(windowFrameRect); // Adjust with 0.5 to avoid border artifacts between // widget background and frame background. windowFrameBackground.addRect(rect().translated(-styleOrigin).adjusted(0.5, 0.5, -0.5, -0.5)); painter->fillPath(windowFrameBackground, palette().window()); } else { painter->fillRect(windowFrameRect, palette().window()); } } painter->setRenderHint(QPainter::NonCosmeticDefaultPen); // Draw title int height = (int)d->titleBarHeight(bar); bar.rect.setHeight(height); if (hasBorder) // Frame is painted by PE_FrameWindow bar.rect.adjust(frameWidth, frameWidth, -frameWidth, 0); painter->save(); painter->setFont(QApplication::font("QWorkspaceTitleBar")); style()->drawComplexControl(QStyle::CC_TitleBar, &bar, painter, widget); painter->restore(); if (setMask) painter->restore(); // Draw window frame QStyleOptionFrame frameOptions; frameOptions.QStyleOption::operator=(*option); initStyleOption(&frameOptions); if (!hasBorder) painter->setClipRect(windowFrameRect.adjusted(0, +height, 0, 0), Qt::IntersectClip); if (hasFocus()) { frameOptions.state |= QStyle::State_HasFocus; } else { frameOptions.state &= ~QStyle::State_HasFocus; } bool isActive = isActiveWindow(); if (isActive) { frameOptions.state |= QStyle::State_Active; } else { frameOptions.state &= ~QStyle::State_Active; } frameOptions.palette.setCurrentColorGroup(isActive ? QPalette::Active : QPalette::Normal); frameOptions.rect = windowFrameRect; frameOptions.lineWidth = style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth, 0, widget); frameOptions.midLineWidth = 1; style()->drawPrimitive(QStyle::PE_FrameWindow, &frameOptions, painter, widget); #ifdef Q_WS_MAC realPainter->drawPixmap(QPoint(), pm); delete painter; #endif } /*! \reimp */ QRectF QGraphicsWidget::boundingRect() const { return windowFrameRect(); } /*! \reimp */ QPainterPath QGraphicsWidget::shape() const { QPainterPath path; path.addRect(rect()); return path; } /*! Call this function to close the widget. Returns true if the widget was closed; otherwise returns false. This slot will first send a QCloseEvent to the widget, which may or may not accept the event. If the event was ignored, nothing happens. If the event was accepted, it will hide() the widget. If the widget has the Qt::WA_DeleteOnClose attribute set it will be deleted. */ bool QGraphicsWidget::close() { QCloseEvent closeEvent; QApplication::sendEvent(this, &closeEvent); if (!closeEvent.isAccepted()) { return false; } // hide if (isVisible()) { hide(); } if (testAttribute(Qt::WA_DeleteOnClose)) { deleteLater(); } return true; } #ifdef Q_NO_USING_KEYWORD /*! \fn const QObjectList &QGraphicsWidget::children() const \internal This function returns the same value as QObject::children(). It's provided to differentiate between the obsolete member QGraphicsItem::children() and QObject::children(). QGraphicsItem now provides childItems() instead. */ #endif #if 0 void QGraphicsWidget::dumpFocusChain() { qDebug() << "=========== Dumping focus chain =============="; int i = 0; QGraphicsWidget *next = this; QSet visited; do { if (!next) { qWarning("Found a focus chain that is not circular, (next == 0)"); break; } qDebug() << i++ << QString::number(uint(next), 16) << next->className() << next->data(0) << QString::fromAscii("focusItem:%1").arg(next->hasFocus() ? '1' : '0') << QLatin1String("next:") << next->d_func()->focusNext->data(0) << QLatin1String("prev:") << next->d_func()->focusPrev->data(0); if (visited.contains(next)) { qWarning("Already visited this node. However, I expected to dump until I found myself."); break; } visited << next; next = next->d_func()->focusNext; } while (next != this); } #endif QT_END_NAMESPACE #endif //QT_NO_GRAPHICSVIEW