/**************************************************************************** ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** http://www.trolltech.com/products/qt/opensource.html ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://www.trolltech.com/products/qt/licensing.html or contact the ** sales department at sales@trolltech.com. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include "qabstractscrollarea.h" #ifndef QT_NO_SCROLLAREA #include "qscrollbar.h" #include "qapplication.h" #include "qstyle.h" #include "qstyleoption.h" #include "qevent.h" #include "qdebug.h" #include "qboxlayout.h" #include "qpainter.h" #include "qabstractscrollarea_p.h" #include <qwidget.h> #ifdef Q_WS_MAC #include <qmacstyle_mac.h> #include <private/qt_mac_p.h> #endif /*! \class QAbstractScrollArea \brief The QAbstractScrollArea widget provides a scrolling area with on-demand scroll bars. \ingroup abstractwidgets QAbstractScrollArea is a low-level abstraction of a scrolling area. It gives you full control of the scroll bars, at the cost of simplicity. In most cases, using a QScrollArea is preferable. QAbstractScrollArea's central child widget is the scrolling area itself, called viewport(). The viewport widget uses all available space. Next to the viewport is a vertical scroll bar (accessible with verticalScrollBar()), and below a horizontal scroll bar (accessible with horizontalScrollBar()). Each scroll bar can be either visible or hidden, depending on the scroll bar's policy (see \l verticalScrollBarPolicy and \l horizontalScrollBarPolicy). When a scroll bar is hidden, the viewport expands in order to cover all available space. When a scroll bar becomes visible again, the viewport shrinks in order to make room for the scroll bar. With a scroll bar policy of Qt::ScrollBarAsNeeded (the default), QAbstractScrollArea shows scroll bars when those provide a non-zero scrolling range, and hides them otherwise. You control the range of each scroll bar with QAbstractSlider::setRange(). In order to track scroll bar movements, reimplement the virtual function scrollContentsBy(). In order to fine-tune scrolling behavior, connect to a scroll bar's QAbstractSlider::actionTriggered() signal and adjust the \l QAbstractSlider::sliderPosition as you wish. It is possible to reserve a margin area around the viewport, see setViewportMargins(). The feature is mostly used to place a QHeaderView widget above or beside the scrolling area. For convenience, QAbstractScrollArea makes all viewport events available in the virtual viewportEvent() handler. QWidget's specialized handlers are remapped to viewport events in the cases where this makes sense. The remapped specialized handlers are: paintEvent(), mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), wheelEvent(), dragEnterEvent(), dragMoveEvent(), dragLeaveEvent(), dropEvent(), contextMenuEvent(). and resizeEvent(). \sa QScrollArea */ QAbstractScrollAreaPrivate::QAbstractScrollAreaPrivate() :hbar(0), vbar(0), vbarpolicy(Qt::ScrollBarAsNeeded), hbarpolicy(Qt::ScrollBarAsNeeded), viewport(0), cornerWidget(0), left(0), top(0), right(0), bottom(0), xoffset(0), yoffset(0), viewportFilter(0) { } QAbstractScrollAreaScrollBarContainer::QAbstractScrollAreaScrollBarContainer(Qt::Orientation orientation, QWidget *parent) :QWidget(parent), scrollBar(new QScrollBar(orientation, this)), layout(new QBoxLayout(orientation == Qt::Horizontal ? QBoxLayout::LeftToRight : QBoxLayout::TopToBottom)), orientation(orientation) { setLayout(layout); layout->setMargin(0); layout->setSpacing(0); layout->addWidget(scrollBar); } /*! \internal Adds a widget to the scroll bar container. */ void QAbstractScrollAreaScrollBarContainer::addWidget(QWidget *widget, LogicalPosition position) { QSizePolicy policy = widget->sizePolicy(); if (orientation == Qt::Vertical) policy.setHorizontalPolicy(QSizePolicy::Ignored); else policy.setVerticalPolicy(QSizePolicy::Ignored); widget->setSizePolicy(policy); widget->setParent(this); const int insertIndex = (position & LogicalLeft) ? 0 : scrollBarLayoutIndex() + 1; layout->insertWidget(insertIndex, widget); } /*! \internal Retuns a list of scroll bar widgets for the given position. The scroll bar itself is not returned. */ QWidgetList QAbstractScrollAreaScrollBarContainer::widgets(LogicalPosition position) { QWidgetList list; const int scrollBarIndex = scrollBarLayoutIndex(); if (position == LogicalLeft) { for (int i = 0; i < scrollBarIndex; ++i) list.append(layout->itemAt(i)->widget()); } else if (position == LogicalRight) { const int layoutItemCount = layout->count(); for (int i = scrollBarIndex + 1; i < layoutItemCount; ++i) list.append(layout->itemAt(i)->widget()); } return list; } /*! \internal Returns the layout index for the scroll bar. This needs to be recalculated by a linear search for each use, since items in the layout can be removed at any time (i.e. when a widget is deleted or re-parented). */ int QAbstractScrollAreaScrollBarContainer::scrollBarLayoutIndex() const { const int layoutItemCount = layout->count(); for (int i = 0; i < layoutItemCount; ++i) { if (qobject_cast<QScrollBar *>(layout->itemAt(i)->widget())) return i; } return -1; } /*! \internal */ void QAbstractScrollAreaPrivate::replaceScrollBar(QScrollBar *scrollBar, Qt::Orientation orientation) { Q_Q(QAbstractScrollArea); QAbstractScrollAreaScrollBarContainer *container = scrollBarContainers[orientation]; bool horizontal = (orientation == Qt::Horizontal); QScrollBar *oldBar = horizontal ? hbar : vbar; if (horizontal) hbar = scrollBar; else vbar = scrollBar; scrollBar->setParent(container); container->scrollBar = scrollBar; container->layout->removeWidget(oldBar); container->layout->insertWidget(0, scrollBar); scrollBar->setVisible(oldBar->isVisibleTo(oldBar->window())); scrollBar->setInvertedAppearance(oldBar->invertedAppearance()); scrollBar->setInvertedControls(oldBar->invertedControls()); scrollBar->setRange(oldBar->minimum(), oldBar->maximum()); scrollBar->setOrientation(oldBar->orientation()); scrollBar->setPageStep(oldBar->pageStep()); scrollBar->setSingleStep(oldBar->singleStep()); scrollBar->setSliderDown(oldBar->isSliderDown()); scrollBar->setSliderPosition(oldBar->sliderPosition()); scrollBar->setTracking(oldBar->hasTracking()); scrollBar->setValue(oldBar->value()); delete oldBar; QObject::connect(scrollBar, SIGNAL(valueChanged(int)), q, horizontal ? SLOT(_q_hslide(int)) : SLOT(_q_vslide(int))); QObject::connect(scrollBar, SIGNAL(rangeChanged(int,int)), q, SLOT(_q_showOrHideScrollBars()), Qt::QueuedConnection); } void QAbstractScrollAreaPrivate::init() { Q_Q(QAbstractScrollArea); scrollBarContainers[Qt::Horizontal] = new QAbstractScrollAreaScrollBarContainer(Qt::Horizontal, q); hbar = scrollBarContainers[Qt::Horizontal]->scrollBar; hbar->setRange(0,0); scrollBarContainers[Qt::Horizontal]->setVisible(false); QObject::connect(hbar, SIGNAL(valueChanged(int)), q, SLOT(_q_hslide(int))); QObject::connect(hbar, SIGNAL(rangeChanged(int,int)), q, SLOT(_q_showOrHideScrollBars()), Qt::QueuedConnection); scrollBarContainers[Qt::Vertical] = new QAbstractScrollAreaScrollBarContainer(Qt::Vertical, q); vbar = scrollBarContainers[Qt::Vertical]->scrollBar; vbar->setRange(0,0); scrollBarContainers[Qt::Vertical]->setVisible(false); QObject::connect(vbar, SIGNAL(valueChanged(int)), q, SLOT(_q_vslide(int))); QObject::connect(vbar, SIGNAL(rangeChanged(int,int)), q, SLOT(_q_showOrHideScrollBars()), Qt::QueuedConnection); viewportFilter = new QAbstractScrollAreaFilter(this); viewport = new QWidget(q); viewport->setObjectName(QLatin1String("qt_scrollarea_viewport")); viewport->setBackgroundRole(QPalette::Base); viewport->setAutoFillBackground(true); viewport->installEventFilter(viewportFilter); viewport->setFocusProxy(q); q->setFocusPolicy(Qt::WheelFocus); q->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken); q->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); layoutChildren(); } void QAbstractScrollAreaPrivate::layoutChildren() { Q_Q(QAbstractScrollArea); bool needh = (hbarpolicy == Qt::ScrollBarAlwaysOn || (hbarpolicy == Qt::ScrollBarAsNeeded && hbar->minimum() < hbar->maximum())); bool needv = (vbarpolicy == Qt::ScrollBarAlwaysOn || (vbarpolicy == Qt::ScrollBarAsNeeded && vbar->minimum() < vbar->maximum())); const int hsbExt = hbar->sizeHint().height(); const int vsbExt = vbar->sizeHint().width(); const QPoint extPoint(vsbExt, hsbExt); const QSize extSize(vsbExt, hsbExt); const QRect widgetRect = q->rect(); QStyleOption opt(0); opt.init(q); const bool hasCornerWidget = (cornerWidget != 0); // If the scroll bars are at the very right and bottom of the window we // move their positions to be aligned with the size grip. #ifdef Q_WS_MAC QWidget * const window = q->window(); // Check if a native sizegrip is present. bool hasMacReverseSizeGrip = false; bool hasMacSizeGrip = false; HIViewRef nativeSizeGrip; HIViewFindByID(HIViewGetRoot(HIViewGetWindow(HIViewRef(q->winId()))), kHIViewWindowGrowBoxID, &nativeSizeGrip); if (nativeSizeGrip) { // Look for a native size grip at the visual window bottom right and at the // absolute window bottom right. In reverse mode, the native size grip does not // swich side, so we need to check if it is on the "wrong side". const QPoint scrollAreaBottomRight = q->mapTo(window, widgetRect.bottomRight() - QPoint(frameWidth, frameWidth)); const QPoint windowBottomRight = window->rect().bottomRight(); const QPoint visualWindowBottomRight = QStyle::visualPos(opt.direction, opt.rect, windowBottomRight); const QPoint offset = windowBottomRight - scrollAreaBottomRight; const QPoint visualOffset = visualWindowBottomRight - scrollAreaBottomRight; hasMacSizeGrip = (visualOffset.manhattanLength() < vsbExt); hasMacReverseSizeGrip = (hasMacSizeGrip == false && (offset.manhattanLength() < hsbExt)); } // Use small scroll bars for tool windows, if the window has a native size grip. const QMacStyle::WidgetSizePolicy hpolicy = QMacStyle::widgetSizePolicy(hbar); const QMacStyle::WidgetSizePolicy vpolicy = QMacStyle::widgetSizePolicy(vbar); const Qt::WindowType windowType = window->windowType(); if (windowType == Qt::Tool && (hasMacSizeGrip || hasMacReverseSizeGrip)) { if (hpolicy != QMacStyle::SizeSmall) QMacStyle::setWidgetSizePolicy(hbar, QMacStyle::SizeSmall); if (vpolicy != QMacStyle::SizeSmall) QMacStyle::setWidgetSizePolicy(vbar, QMacStyle::SizeSmall); } else { if (hpolicy != QMacStyle::SizeDefault) QMacStyle::setWidgetSizePolicy(hbar, QMacStyle::SizeDefault); if (vpolicy != QMacStyle::SizeDefault) QMacStyle::setWidgetSizePolicy(vbar, QMacStyle::SizeDefault); } #endif QPoint cornerOffset(needv ? vsbExt : 0, needh ? hsbExt : 0); QRect controlsRect; QRect viewportRect; // In FrameOnlyAroundContents mode the frame is drawn between the controls and // the viewport, else the frame rect is equal to the widget rect. if (q->style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents, &opt, q)) { controlsRect = widgetRect; const int extra = q->style()->pixelMetric(QStyle::PM_DefaultFrameWidth) * 2; const QPoint cornerExtra(needv ? extra : 0, needh ? extra : 0); QRect frameRect = widgetRect; frameRect.adjust(0, 0, -cornerOffset.x() - cornerExtra.x(), -cornerOffset.y() - cornerExtra.y()); q->setFrameRect(frameRect); viewportRect = q->contentsRect(); } else { q->setFrameRect(QStyle::visualRect(opt.direction, opt.rect, widgetRect)); controlsRect = q->contentsRect(); viewportRect = QRect(controlsRect.topLeft(), controlsRect.bottomRight() - cornerOffset); } // If we have a corner widget and are only showing one scroll bar, we need to move it // to make room for the corner widget. if (hasCornerWidget && (needv || needh)) cornerOffset = extPoint; #ifdef Q_WS_MAC // Also move the scroll bars if they are covered by the native Mac size grip. if (hasMacSizeGrip) cornerOffset = extPoint; #endif // The corner point is where the scroll bar rects, the corner widget rect and the // viewport rect meets. const QPoint cornerPoint(controlsRect.bottomRight() + QPoint(1, 1) - cornerOffset); // Some styles paints the corner if both scorllbars are showing and there is // no corner widget. Also, on the Mac we paint if there is a native // (transparent) sizegrip in the area where a corner widget would be. if (needv && needh && hasCornerWidget == false #ifdef Q_WS_MAC || ((needv || needh) && hasMacSizeGrip) #endif ) { cornerPaintingRect = QStyle::visualRect(opt.direction, opt.rect, QRect(cornerPoint, extSize)); } else { cornerPaintingRect = QRect(); } #ifdef Q_WS_MAC if (hasMacReverseSizeGrip) reverseCornerPaintingRect = QRect(controlsRect.bottomRight() + QPoint(1, 1) - extPoint, extSize); else reverseCornerPaintingRect = QRect(); #endif if (needh) { QRect horizontalScrollBarRect(QPoint(controlsRect.left(), cornerPoint.y()), QPoint(cornerPoint.x() - 1, controlsRect.bottom())); #ifdef Q_WS_MAC if (hasMacReverseSizeGrip) horizontalScrollBarRect.adjust(vsbExt, 0, 0, 0); #endif scrollBarContainers[Qt::Horizontal]->setGeometry(QStyle::visualRect(opt.direction, opt.rect, horizontalScrollBarRect)); scrollBarContainers[Qt::Horizontal]->raise(); } if (needv) { const QRect verticalScrollBarRect (QPoint(cornerPoint.x(), controlsRect.top()), QPoint(controlsRect.right(), cornerPoint.y() - 1)); scrollBarContainers[Qt::Vertical]->setGeometry(QStyle::visualRect(opt.direction, opt.rect, verticalScrollBarRect)); scrollBarContainers[Qt::Vertical]->raise(); } if (cornerWidget) { const QRect cornerWidgetRect(cornerPoint, controlsRect.bottomRight()); cornerWidget->setGeometry(QStyle::visualRect(opt.direction, opt.rect, cornerWidgetRect)); } scrollBarContainers[Qt::Horizontal]->setVisible(needh); scrollBarContainers[Qt::Vertical]->setVisible(needv); // Existing code expect to have to account for reverse mode when calling // setViewportMargins(), so we undo that here to preserve the behavior. // ### Qt 5: Consider changing the behavior. if (QApplication::isRightToLeft()) viewportRect.adjust(right, top, -left, -bottom); else viewportRect.adjust(left, top, -right, -bottom); viewport->setGeometry(QStyle::visualRect(opt.direction, opt.rect, viewportRect)); // resize the viewport last } /*! \internal Creates a new QAbstractScrollAreaPrivate, \a dd with the given \a parent. */ 00383 QAbstractScrollArea::QAbstractScrollArea(QAbstractScrollAreaPrivate &dd, QWidget *parent) :QFrame(dd, parent) { Q_D(QAbstractScrollArea); d->init(); } /*! Constructs a viewport. The \a parent arguments is sent to the QWidget constructor. */ 00395 QAbstractScrollArea::QAbstractScrollArea(QWidget *parent) :QFrame(*new QAbstractScrollAreaPrivate, parent) { Q_D(QAbstractScrollArea); d->init(); } /*! Destroys the viewport. */ 00406 QAbstractScrollArea::~QAbstractScrollArea() { Q_D(QAbstractScrollArea); delete d->viewportFilter; } /*! \since 4.2 Sets the viewport to be the given \a widget. The QAbstractScrollArea will take ownership of the given \a widget. If \a widget is 0, QAbstractScrollArea will assign a new QWidget instance for the viewport. \sa viewport() */ 00423 void QAbstractScrollArea::setViewport(QWidget *widget) { Q_D(QAbstractScrollArea); if (widget != d->viewport) { QWidget *oldViewport = d->viewport; if (!widget) widget = new QWidget; d->viewport = widget; d->viewport->setParent(this); d->viewport->setFocusProxy(this); d->viewport->installEventFilter(d->viewportFilter); d->layoutChildren(); if (isVisible()) d->viewport->show(); QMetaObject::invokeMethod(this, "setupViewport", Q_ARG(QWidget *, widget)); delete oldViewport; } } /*! Returns the viewport widget. Use the QScrollArea::widget() function to retrieve the contents of the viewport widget. \sa QScrollArea::widget() */ 00450 QWidget *QAbstractScrollArea::viewport() const { Q_D(const QAbstractScrollArea); return d->viewport; } /*! Returns the size of the viewport as if the scroll bars had no valid scrolling range. */ // ### still thinking about the name 00462 QSize QAbstractScrollArea::maximumViewportSize() const { Q_D(const QAbstractScrollArea); int hsbExt = d->hbar->sizeHint().height(); int vsbExt = d->vbar->sizeHint().width(); int f = 2 * d->frameWidth; QSize max = size() - QSize(f + d->left + d->right, f + d->top + d->bottom); if (d->vbarpolicy == Qt::ScrollBarAlwaysOn) max.rwidth() -= vsbExt; if (d->hbarpolicy == Qt::ScrollBarAlwaysOn) max.rheight() -= hsbExt; return max; } /*! \property QAbstractScrollArea::verticalScrollBarPolicy \brief the policy for the vertical scroll bar The default policy is Qt::ScrollBarAsNeeded. \sa horizontalScrollBarPolicy */ Qt::ScrollBarPolicy QAbstractScrollArea::verticalScrollBarPolicy() const { Q_D(const QAbstractScrollArea); return d->vbarpolicy; } void QAbstractScrollArea::setVerticalScrollBarPolicy(Qt::ScrollBarPolicy policy) { Q_D(QAbstractScrollArea); d->vbarpolicy = policy; if (isVisible()) d->layoutChildren(); } /*! Returns the vertical scroll bar. \sa verticalScrollBarPolicy, horizontalScrollBar() */ 00506 QScrollBar *QAbstractScrollArea::verticalScrollBar() const { Q_D(const QAbstractScrollArea); return d->vbar; } /*! \since 4.2 Replaces the existing vertical scroll bar with \a scrollBar, and sets all the former scroll bar's slider properties on the new scroll bar. The former scroll bar is then deleted. QAbstractScrollArea already provides vertical and horizontal scroll bars by default. You can call this function to replace the default vertical scroll bar with your own custom scroll bar. \sa verticalScrollBar(), setHorizontalScrollBar() */ 00524 void QAbstractScrollArea::setVerticalScrollBar(QScrollBar *scrollBar) { Q_D(QAbstractScrollArea); if (!scrollBar) { qWarning("QAbstractScrollArea::setVerticalScrollBar: Cannot set a null scroll bar"); return; } d->replaceScrollBar(scrollBar, Qt::Vertical); } /*! \property QAbstractScrollArea::horizontalScrollBarPolicy \brief the policy for the horizontal scroll bar The default policy is Qt::ScrollBarAsNeeded. \sa verticalScrollBarPolicy */ Qt::ScrollBarPolicy QAbstractScrollArea::horizontalScrollBarPolicy() const { Q_D(const QAbstractScrollArea); return d->hbarpolicy; } void QAbstractScrollArea::setHorizontalScrollBarPolicy(Qt::ScrollBarPolicy policy) { Q_D(QAbstractScrollArea); d->hbarpolicy = policy; if (isVisible()) d->layoutChildren(); } /*! Returns the horizontal scroll bar. \sa horizontalScrollBarPolicy, verticalScrollBar() */ 00563 QScrollBar *QAbstractScrollArea::horizontalScrollBar() const { Q_D(const QAbstractScrollArea); return d->hbar; } /*! \since 4.2 Replaces the existing horizontal scroll bar with \a scrollBar, and sets all the former scroll bar's slider properties on the new scroll bar. The former scroll bar is then deleted. QAbstractScrollArea already provides horizontal and vertical scroll bars by default. You can call this function to replace the default horizontal scroll bar with your own custom scroll bar. \sa horizontalScrollBar(), setVerticalScrollBar() */ 00582 void QAbstractScrollArea::setHorizontalScrollBar(QScrollBar *scrollBar) { Q_D(QAbstractScrollArea); if (!scrollBar) { qWarning("QAbstractScrollArea::setHorizontalScrollBar: Cannot set a null scroll bar"); return; } d->replaceScrollBar(scrollBar, Qt::Horizontal); } /*! \since 4.2 Returns the widget in the corner between the two scroll bars. By default, no corner widget is present. */ 00600 QWidget *QAbstractScrollArea::cornerWidget() const { Q_D(const QAbstractScrollArea); return d->cornerWidget; } /*! \since 4.2 Sets the widget in the corner between the two scroll bars to be \a widget. You will probably also want to set at least one of the scroll bar modes to \c AlwaysOn. Passing 0 shows no widget in the corner. Any previous corner widget is hidden. You may call setCornerWidget() with the same widget at different times. All widgets set here will be deleted by the scroll area when it is destroyed unless you separately reparent the widget after setting some other corner widget (or 0). Any \e newly set widget should have no current parent. By default, no corner widget is present. \sa horizontalScrollBarPolicy, horizontalScrollBarPolicy */ 00632 void QAbstractScrollArea::setCornerWidget(QWidget *widget) { Q_D(QAbstractScrollArea); QWidget* oldWidget = d->cornerWidget; if (oldWidget != widget) { if (oldWidget) oldWidget->hide(); d->cornerWidget = widget; if (widget && widget->parentWidget() != this) widget->setParent(this); d->layoutChildren(); if (widget) widget->show(); } else { d->cornerWidget = widget; d->layoutChildren(); } } /*! \since 4.2 Adds \a widget as a scroll bar widget in the location specified by \a alignment. Scroll bar widgets are shown next to the horizontal or vertical scroll bar, and can be placed on either side of it. If you want the scroll bar widgets to be always visible, set the scrollBarPolicy for the corresponding scroll bar to \c AlwaysOn. \a alignment must be one of Qt::Alignleft and Qt::AlignRight, which maps to the horizontal scroll bar, or Qt::AlignTop and Qt::AlignBottom, which maps to the vertical scroll bar. A scroll bar widget can be removed by either re-parenting the widget or deleting it. It's also possible to hide a widget with QWidget::hide() The scroll bar widget will be resized to fit the scroll bar geometry for the current style. The following describes the case for scroll bar widgets on the horizontal scroll bar: The height of the widget will be set to match the height of the scroll bar. To control the width of the widget, use QWidget::setMinimumWidth and QWidget::setMaximumWidth, or implement QWidget::sizeHint() and set a horizontal size policy. If you want a square widget, call QStyle::pixelMetric(QStyle::PM_ScrollBarExtent) and set the width to this value. \sa scrollBarWidgets() */ 00685 void QAbstractScrollArea::addScrollBarWidget(QWidget *widget, Qt::Alignment alignment) { Q_D(QAbstractScrollArea); if (widget == 0) return; const Qt::Orientation scrollBarOrientation = ((alignment & Qt::AlignLeft) || (alignment & Qt::AlignRight)) ? Qt::Horizontal : Qt::Vertical; const QAbstractScrollAreaScrollBarContainer::LogicalPosition position = ((alignment & Qt::AlignRight) || (alignment & Qt::AlignBottom)) ? QAbstractScrollAreaScrollBarContainer::LogicalRight : QAbstractScrollAreaScrollBarContainer::LogicalLeft; d->scrollBarContainers[scrollBarOrientation]->addWidget(widget, position); d->layoutChildren(); if (isHidden() == false) widget->show(); } /*! \since 4.2 Returns a list of the currently set scroll bar widgets. \a alignment can be any combination of the four location flags. \sa addScrollBarWidget() */ 00710 QWidgetList QAbstractScrollArea::scrollBarWidgets(Qt::Alignment alignment) { Q_D(QAbstractScrollArea); QWidgetList list; if (alignment & Qt::AlignLeft) list += d->scrollBarContainers[Qt::Horizontal]->widgets(QAbstractScrollAreaScrollBarContainer::LogicalLeft); if (alignment & Qt::AlignRight) list += d->scrollBarContainers[Qt::Horizontal]->widgets(QAbstractScrollAreaScrollBarContainer::LogicalRight); if (alignment & Qt::AlignTop) list += d->scrollBarContainers[Qt::Vertical]->widgets(QAbstractScrollAreaScrollBarContainer::LogicalLeft); if (alignment & Qt::AlignBottom) list += d->scrollBarContainers[Qt::Vertical]->widgets(QAbstractScrollAreaScrollBarContainer::LogicalRight); return list; } /*! Sets the margins around the scrolling area to \a left, \a top, \a right and \a bottom. This is useful for applications such as spreadsheets with "locked" rows and columns. The marginal space is is left blank; put widgets in the unused area. By default all margins are zero. */ 00737 void QAbstractScrollArea::setViewportMargins(int left, int top, int right, int bottom) { Q_D(QAbstractScrollArea); d->left = left; d->top = top; d->right = right; d->bottom = bottom; d->layoutChildren(); } /*! \fn bool QAbstractScrollArea::event(QEvent *event) \reimp This is the main event handler for the QAbstractScrollArea widget (\e not the scrolling area viewport()). The specified \a event is a general event object that may need to be cast to the appropriate class depending on its type. \sa QEvent::type() */ 00759 bool QAbstractScrollArea::event(QEvent *e) { Q_D(QAbstractScrollArea); switch (e->type()) { case QEvent::AcceptDropsChange: d->viewport->setAcceptDrops(acceptDrops()); break; case QEvent::MouseTrackingChange: d->viewport->setMouseTracking(hasMouseTracking()); break; case QEvent::Resize: d->layoutChildren(); break; case QEvent::Paint: if (d->cornerPaintingRect.isValid()) { QStyleOption option; option.rect = d->cornerPaintingRect; QPainter p(this); style()->drawPrimitive(QStyle::PE_PanelScrollAreaCorner, &option, &p, this); } #ifdef Q_WS_MAC if (d->reverseCornerPaintingRect.isValid()) { QStyleOption option; option.rect = d->reverseCornerPaintingRect; QPainter p(this); style()->drawPrimitive(QStyle::PE_PanelScrollAreaCorner, &option, &p, this); } #endif QFrame::paintEvent((QPaintEvent*)e); break; case QEvent::ContextMenu: if (static_cast<QContextMenuEvent *>(e)->reason() == QContextMenuEvent::Keyboard) return QFrame::event(e); e->ignore(); break; case QEvent::MouseButtonPress: case QEvent::MouseButtonRelease: case QEvent::MouseButtonDblClick: case QEvent::MouseMove: case QEvent::Wheel: #ifndef QT_NO_DRAGANDDROP case QEvent::Drop: case QEvent::DragEnter: case QEvent::DragMove: case QEvent::DragLeave: #endif return false; case QEvent::StyleChange: d->layoutChildren(); // fall through default: return QFrame::event(e); } return true; } /*! \fn bool QAbstractScrollArea::viewportEvent(QEvent *event) The main event handler for the scrolling area (the viewport() widget). It handles the \a event specified, and can be called by subclasses to provide reasonable default behavior. Returns true to indicate to the event system that the event has been handled, and needs no further processing; otherwise returns false to indicate that the event should be propagated further. You can reimplement this function in a subclass, but we recommend using one of the specialized event handlers instead. Specialised handlers for viewport events are: paintEvent(), mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), wheelEvent(), dragEnterEvent(), dragMoveEvent(), dragLeaveEvent(), dropEvent(), contextMenuEvent(), and resizeEvent(). */ 00835 bool QAbstractScrollArea::viewportEvent(QEvent *e) { switch (e->type()) { case QEvent::Resize: case QEvent::Paint: case QEvent::MouseButtonPress: case QEvent::MouseButtonRelease: case QEvent::MouseButtonDblClick: case QEvent::MouseMove: case QEvent::ContextMenu: #ifndef QT_NO_WHEELEVENT case QEvent::Wheel: #endif #ifndef QT_NO_DRAGANDDROP case QEvent::Drop: case QEvent::DragEnter: case QEvent::DragMove: case QEvent::DragLeave: #endif return QFrame::event(e); case QEvent::LayoutRequest: return event(e); default: break; } return false; // let the viewport widget handle the event } /*! \fn void QAbstractScrollArea::resizeEvent(QResizeEvent *event) This event handler can be reimplemented in a subclass to receive resize events (passed in \a event), for the viewport() widget. When resizeEvent() is called, the viewport already has its new geometry: Its new size is accessible through the QResizeEvent::size() function, and the old size through QResizeEvent::oldSize(). \sa QWidget::resizeEvent() */ 00876 void QAbstractScrollArea::resizeEvent(QResizeEvent *) { } /*! \fn void QAbstractScrollArea::paintEvent(QPaintEvent *event) This event handler can be reimplemented in a subclass to receive paint events (passed in \a event), for the viewport() widget. Note: If you open a painter, make sure to open it on the viewport(). \sa QWidget::paintEvent() */ 00891 void QAbstractScrollArea::paintEvent(QPaintEvent*) { } /*! This event handler can be reimplemented in a subclass to receive mouse press events for the viewport() widget. The event is passed in \a e. \sa QWidget::mousePressEvent() */ 00902 void QAbstractScrollArea::mousePressEvent(QMouseEvent *e) { e->ignore(); } /*! This event handler can be reimplemented in a subclass to receive mouse release events for the viewport() widget. The event is passed in \a e. \sa QWidget::mouseReleaseEvent() */ 00914 void QAbstractScrollArea::mouseReleaseEvent(QMouseEvent *e) { e->ignore(); } /*! This event handler can be reimplemented in a subclass to receive mouse double click events for the viewport() widget. The event is passed in \a e. \sa QWidget::mouseDoubleClickEvent() */ 00926 void QAbstractScrollArea::mouseDoubleClickEvent(QMouseEvent *e) { e->ignore(); } /*! This event handler can be reimplemented in a subclass to receive mouse move events for the viewport() widget. The event is passed in \a e. \sa QWidget::mouseMoveEvent() */ 00938 void QAbstractScrollArea::mouseMoveEvent(QMouseEvent *e) { e->ignore(); } /*! This event handler can be reimplemented in a subclass to receive wheel events for the viewport() widget. The event is passed in \a e. \sa QWidget::wheelEvent() */ #ifndef QT_NO_WHEELEVENT 00951 void QAbstractScrollArea::wheelEvent(QWheelEvent *e) { Q_D(QAbstractScrollArea); if (static_cast<QWheelEvent*>(e)->orientation() == Qt::Horizontal) QApplication::sendEvent(d->hbar, e); else QApplication::sendEvent(d->vbar, e); } #endif /*! This event handler can be reimplemented in a subclass to receive context menu events for the viewport() widget. The event is passed in \a e. \sa QWidget::contextMenuEvent() */ 00968 void QAbstractScrollArea::contextMenuEvent(QContextMenuEvent *e) { e->ignore(); } /*! This function is called with key event \a e when key presses occur. It handles PageUp, PageDown, Up, Down, Left, and Right, and ignores all other key presses. */ 00978 void QAbstractScrollArea::keyPressEvent(QKeyEvent * e) { Q_D(QAbstractScrollArea); if (false){ #ifndef QT_NO_SHORTCUT } else if (e == QKeySequence::MoveToPreviousPage) { d->vbar->triggerAction(QScrollBar::SliderPageStepSub); } else if (e == QKeySequence::MoveToNextPage) { d->vbar->triggerAction(QScrollBar::SliderPageStepAdd); #endif } else { switch (e->key()) { case Qt::Key_Up: d->vbar->triggerAction(QScrollBar::SliderSingleStepSub); break; case Qt::Key_Down: d->vbar->triggerAction(QScrollBar::SliderSingleStepAdd); break; case Qt::Key_Left: d->hbar->triggerAction(QScrollBar::SliderSingleStepSub); break; case Qt::Key_Right: d->hbar->triggerAction(QScrollBar::SliderSingleStepAdd); break; default: e->ignore(); return; } } e->accept(); } #ifndef QT_NO_DRAGANDDROP /*! \fn void QAbstractScrollArea::dragEnterEvent(QDragEnterEvent *event) This event handler can be reimplemented in a subclass to receive drag enter events (passed in \a event), for the viewport() widget. \sa QWidget::dragEnterEvent() */ 01020 void QAbstractScrollArea::dragEnterEvent(QDragEnterEvent *) { } /*! \fn void QAbstractScrollArea::dragMoveEvent(QDragMoveEvent *event) This event handler can be reimplemented in a subclass to receive drag move events (passed in \a event), for the viewport() widget. \sa QWidget::dragMoveEvent() */ 01032 void QAbstractScrollArea::dragMoveEvent(QDragMoveEvent *) { } /*! \fn void QAbstractScrollArea::dragLeaveEvent(QDragLeaveEvent *event) This event handler can be reimplemented in a subclass to receive drag leave events (passed in \a event), for the viewport() widget. \sa QWidget::dragLeaveEvent() */ 01044 void QAbstractScrollArea::dragLeaveEvent(QDragLeaveEvent *) { } /*! \fn void QAbstractScrollArea::dropEvent(QDropEvent *event) This event handler can be reimplemented in a subclass to receive drop events (passed in \a event), for the viewport() widget. \sa QWidget::dropEvent() */ 01056 void QAbstractScrollArea::dropEvent(QDropEvent *) { } #endif /*! This virtual handler is called when the scroll bars are moved by \a dx, \a dy, and consequently the viewport's contents should be scrolled accordingly. The default implementation simply calls update() on the entire viewport(), subclasses can reimplement this handler for optimization purposes, or - like QScrollArea - to move a contents widget. The parameters \a dx and \a dy are there for convenience, so that the class knows how much should be scrolled (useful e.g. when doing pixel-shifts). You may just as well ignore these values and scroll directly to the position the scroll bars indicate. Calling this function in order to scroll programmatically is an error, use the scroll bars instead (e.g. by calling QScrollBar::setValue() directly). */ 01081 void QAbstractScrollArea::scrollContentsBy(int, int) { viewport()->update(); } void QAbstractScrollAreaPrivate::_q_hslide(int x) { Q_Q(QAbstractScrollArea); int dx = xoffset - x; xoffset = x; q->scrollContentsBy(dx, 0); } void QAbstractScrollAreaPrivate::_q_vslide(int y) { Q_Q(QAbstractScrollArea); int dy = yoffset - y; yoffset = y; q->scrollContentsBy(0, dy); } void QAbstractScrollAreaPrivate::_q_showOrHideScrollBars() { layoutChildren(); } QPoint QAbstractScrollAreaPrivate::contentsOffset() const { Q_Q(const QAbstractScrollArea); QPoint offset; if (vbar->isVisible()) offset.setY(vbar->value()); if (hbar->isVisible()) { if (q->isRightToLeft()) offset.setX(hbar->maximum() - hbar->value()); else offset.setX(hbar->value()); } return offset; } /*! \reimp */ 01126 QSize QAbstractScrollArea::minimumSizeHint() const { Q_D(const QAbstractScrollArea); int hsbExt = d->hbar->sizeHint().height(); int vsbExt = d->vbar->sizeHint().width(); int extra = 2 * d->frameWidth; return QSize(d->scrollBarContainers[Qt::Horizontal]->sizeHint().width() + vsbExt + extra, d->scrollBarContainers[Qt::Vertical]->sizeHint().height() + hsbExt + extra); } /*! \reimp */ 01139 QSize QAbstractScrollArea::sizeHint() const { return QSize(256, 192); #if 0 Q_D(const QAbstractScrollArea); int h = qMax(10, fontMetrics().height()); int f = 2 * d->frameWidth; return QSize((6 * h) + f, (4 * h) + f); #endif } /*! This slot is called by QAbstractScrollArea after setViewport(\a viewport) has been called. Reimplement this function in a subclass of QAbstractScrollArea to initialize the new \a viewport before it is used. \sa setViewport() */ 01158 void QAbstractScrollArea::setupViewport(QWidget *viewport) { Q_UNUSED(viewport); } #include "moc_qabstractscrollarea.cpp" #include "moc_qabstractscrollarea_p.cpp" #endif // QT_NO_SCROLLAREA