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Diffstat (limited to 'src/gui/widgets/qsizegrip.cpp')
| -rw-r--r-- | src/gui/widgets/qsizegrip.cpp | 566 |
1 files changed, 566 insertions, 0 deletions
diff --git a/src/gui/widgets/qsizegrip.cpp b/src/gui/widgets/qsizegrip.cpp new file mode 100644 index 0000000..6458b15 --- /dev/null +++ b/src/gui/widgets/qsizegrip.cpp @@ -0,0 +1,566 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qsizegrip.h" + +#ifndef QT_NO_SIZEGRIP + +#include "qapplication.h" +#include "qevent.h" +#include "qpainter.h" +#include "qstyle.h" +#include "qstyleoption.h" +#include "qlayout.h" +#include "qdebug.h" +#include <QDesktopWidget> + +#if defined(Q_WS_X11) +#include <private/qt_x11_p.h> +#elif defined (Q_WS_WIN) +#include "qt_windows.h" +#endif +#ifdef Q_WS_MAC +#include <private/qt_mac_p.h> +#endif + +#include <private/qwidget_p.h> +#include <QtGui/qabstractscrollarea.h> + +#define SZ_SIZEBOTTOMRIGHT 0xf008 +#define SZ_SIZEBOTTOMLEFT 0xf007 +#define SZ_SIZETOPLEFT 0xf004 +#define SZ_SIZETOPRIGHT 0xf005 + +QT_BEGIN_NAMESPACE + +static QWidget *qt_sizegrip_topLevelWidget(QWidget* w) +{ + while (w && !w->isWindow() && w->windowType() != Qt::SubWindow) + w = w->parentWidget(); + return w; +} + +static inline bool hasHeightForWidth(QWidget *widget) +{ + if (!widget) + return false; + if (QLayout *layout = widget->layout()) + return layout->hasHeightForWidth(); + return widget->sizePolicy().hasHeightForWidth(); +} + +class QSizeGripPrivate : public QWidgetPrivate +{ + Q_DECLARE_PUBLIC(QSizeGrip) +public: + void init(); + QPoint p; + QRect r; + int d; + int dxMax; + int dyMax; + Qt::Corner m_corner; + bool gotMousePress; +#ifdef Q_WS_MAC + void updateMacSizer(bool hide) const; +#endif + Qt::Corner corner() const; + inline bool atBottom() const + { + return m_corner == Qt::BottomRightCorner || m_corner == Qt::BottomLeftCorner; + } + + inline bool atLeft() const + { + return m_corner == Qt::BottomLeftCorner || m_corner == Qt::TopLeftCorner; + } + + // This slot is invoked by QLayout when the size grip is added to + // a layout or reparented after the tlw is shown. This re-implementation is basically + // the same as QWidgetPrivate::_q_showIfNotHidden except that it checks + // for Qt::WindowFullScreen and Qt::WindowMaximized as well. + void _q_showIfNotHidden() + { + Q_Q(QSizeGrip); + bool showSizeGrip = !(q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide)); + QWidget *tlw = qt_sizegrip_topLevelWidget(q); + if (tlw && showSizeGrip) { + Qt::WindowStates sizeGripNotVisibleState = Qt::WindowFullScreen; +#ifndef Q_WS_MAC + sizeGripNotVisibleState |= Qt::WindowMaximized; +#endif + // Don't show the size grip if the tlw is maximized or in full screen mode. + showSizeGrip = !(tlw->windowState() & sizeGripNotVisibleState); + } + if (showSizeGrip) + q->setVisible(true); + } +}; + +#ifdef Q_WS_MAC +void QSizeGripPrivate::updateMacSizer(bool hide) const +{ + Q_Q(const QSizeGrip); + if (QApplication::closingDown() || !q->parentWidget()) + return; + QWidget *topLevelWindow = qt_sizegrip_topLevelWidget(const_cast<QSizeGrip *>(q)); + if(topLevelWindow && topLevelWindow->isWindow()) + QWidgetPrivate::qt_mac_update_sizer(topLevelWindow, hide ? -1 : 1); +} +#endif + +Qt::Corner QSizeGripPrivate::corner() const +{ + Q_Q(const QSizeGrip); + QWidget *tlw = qt_sizegrip_topLevelWidget(const_cast<QSizeGrip *>(q)); + const QPoint sizeGripPos = q->mapTo(tlw, QPoint(0, 0)); + bool isAtBottom = sizeGripPos.y() >= tlw->height() / 2; + bool isAtLeft = sizeGripPos.x() <= tlw->width() / 2; + if (isAtLeft) + return isAtBottom ? Qt::BottomLeftCorner : Qt::TopLeftCorner; + else + return isAtBottom ? Qt::BottomRightCorner : Qt::TopRightCorner; +} + +/*! + \class QSizeGrip + + \brief The QSizeGrip class provides a resize handle for resizing top-level windows. + + \ingroup application + \ingroup basicwidgets + \ingroup appearance + + This widget works like the standard Windows resize handle. In the + X11 version this resize handle generally works differently from + the one provided by the system if the X11 window manager does not + support necessary modern post-ICCCM specifications. + + Put this widget anywhere in a widget tree and the user can use it + to resize the top-level window or any widget with the Qt::SubWindow + flag set. Generally, this should be in the lower right-hand corner. + Note that QStatusBar already uses this widget, so if you have a + status bar (e.g., you are using QMainWindow), then you don't need + to use this widget explicitly. + + On some platforms the size grip automatically hides itself when the + window is shown full screen or maximised. + + \table 50% + \row \o \inlineimage plastique-sizegrip.png Screenshot of a Plastique style size grip + \o A size grip widget at the bottom-right corner of a main window, shown in the + \l{Plastique Style Widget Gallery}{Plastique widget style}. + \endtable + + The QSizeGrip class inherits QWidget and reimplements the \l + {QWidget::mousePressEvent()}{mousePressEvent()} and \l + {QWidget::mouseMoveEvent()}{mouseMoveEvent()} functions to feature + the resize functionality, and the \l + {QWidget::paintEvent()}{paintEvent()} function to render the + size grip widget. + + \sa QStatusBar QWidget::windowState() +*/ + + +/*! + Constructs a resize corner as a child widget of the given \a + parent. +*/ +QSizeGrip::QSizeGrip(QWidget * parent) + : QWidget(*new QSizeGripPrivate, parent, 0) +{ + Q_D(QSizeGrip); + d->init(); +} + +#ifdef QT3_SUPPORT +/*! + \obsolete + + Constructs a resize corner with the given \a name, as a child + widget of the given \a parent. +*/ +QSizeGrip::QSizeGrip(QWidget * parent, const char* name) + : QWidget(*new QSizeGripPrivate, parent, 0) +{ + Q_D(QSizeGrip); + setObjectName(QString::fromAscii(name)); + d->init(); +} +#endif + +void QSizeGripPrivate::init() +{ + Q_Q(QSizeGrip); + dxMax = 0; + dyMax = 0; + m_corner = q->isLeftToRight() ? Qt::BottomRightCorner : Qt::BottomLeftCorner; + gotMousePress = false; + +#if !defined(QT_NO_CURSOR) && !defined(Q_WS_MAC) + q->setCursor(m_corner == Qt::TopLeftCorner || m_corner == Qt::BottomRightCorner + ? Qt::SizeFDiagCursor : Qt::SizeBDiagCursor); +#endif + q->setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed)); + QWidget *tlw = qt_sizegrip_topLevelWidget(q); + tlw->installEventFilter(q); +} + + +/*! + Destroys this size grip. +*/ +QSizeGrip::~QSizeGrip() +{ +} + +/*! + \reimp +*/ +QSize QSizeGrip::sizeHint() const +{ + QStyleOption opt(0); + opt.init(this); + return (style()->sizeFromContents(QStyle::CT_SizeGrip, &opt, QSize(13, 13), this). + expandedTo(QApplication::globalStrut())); +} + +/*! + Paints the resize grip. + + Resize grips are usually rendered as small diagonal textured lines + in the lower-right corner. The paint event is passed in the \a + event parameter. +*/ +void QSizeGrip::paintEvent(QPaintEvent *event) +{ + Q_UNUSED(event); + Q_D(QSizeGrip); + QPainter painter(this); + QStyleOptionSizeGrip opt; + opt.init(this); + opt.corner = d->m_corner; + style()->drawControl(QStyle::CE_SizeGrip, &opt, &painter, this); +} + +/*! + \fn void QSizeGrip::mousePressEvent(QMouseEvent * event) + + Receives the mouse press events for the widget, and primes the + resize operation. The mouse press event is passed in the \a event + parameter. +*/ +void QSizeGrip::mousePressEvent(QMouseEvent * e) +{ + if (e->button() != Qt::LeftButton) { + QWidget::mousePressEvent(e); + return; + } + + Q_D(QSizeGrip); + QWidget *tlw = qt_sizegrip_topLevelWidget(this); + d->p = e->globalPos(); + d->gotMousePress = true; + d->r = tlw->geometry(); + +#ifdef Q_WS_X11 + // Use a native X11 sizegrip for "real" top-level windows if supported. + if (tlw->isWindow() && X11->isSupportedByWM(ATOM(_NET_WM_MOVERESIZE)) + && !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !hasHeightForWidth(tlw)) { + XEvent xev; + xev.xclient.type = ClientMessage; + xev.xclient.message_type = ATOM(_NET_WM_MOVERESIZE); + xev.xclient.display = X11->display; + xev.xclient.window = tlw->winId(); + xev.xclient.format = 32; + xev.xclient.data.l[0] = e->globalPos().x(); + xev.xclient.data.l[1] = e->globalPos().y(); + if (d->atBottom()) + xev.xclient.data.l[2] = d->atLeft() ? 6 : 4; // bottomleft/bottomright + else + xev.xclient.data.l[2] = d->atLeft() ? 0 : 2; // topleft/topright + xev.xclient.data.l[3] = Button1; + xev.xclient.data.l[4] = 0; + XUngrabPointer(X11->display, X11->time); + XSendEvent(X11->display, QX11Info::appRootWindow(x11Info().screen()), False, + SubstructureRedirectMask | SubstructureNotifyMask, &xev); + return; + } +#endif // Q_WS_X11 +#ifdef Q_WS_WIN + if (tlw->isWindow() && !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !hasHeightForWidth(tlw)) { + uint orientation = 0; + if (d->atBottom()) + orientation = d->atLeft() ? SZ_SIZEBOTTOMLEFT : SZ_SIZEBOTTOMRIGHT; + else + orientation = d->atLeft() ? SZ_SIZETOPLEFT : SZ_SIZETOPRIGHT; + + ReleaseCapture(); + QT_WA_INLINE(PostMessageW(tlw->winId(), WM_SYSCOMMAND, orientation, 0), + PostMessageA(tlw->winId(), WM_SYSCOMMAND, orientation, 0)); + return; + } +#endif // Q_WS_WIN + + // Find available desktop/workspace geometry. + QRect availableGeometry; + bool hasVerticalSizeConstraint = true; + bool hasHorizontalSizeConstraint = true; + if (tlw->isWindow()) + availableGeometry = QApplication::desktop()->availableGeometry(tlw); + else { + const QWidget *tlwParent = tlw->parentWidget(); + // Check if tlw is inside QAbstractScrollArea/QScrollArea. + // If that's the case tlw->parentWidget() will return the viewport + // and tlw->parentWidget()->parentWidget() will return the scroll area. +#ifndef QT_NO_SCROLLAREA + QAbstractScrollArea *scrollArea = qobject_cast<QAbstractScrollArea *>(tlwParent->parentWidget()); + if (scrollArea) { + hasHorizontalSizeConstraint = scrollArea->horizontalScrollBarPolicy() == Qt::ScrollBarAlwaysOff; + hasVerticalSizeConstraint = scrollArea->verticalScrollBarPolicy() == Qt::ScrollBarAlwaysOff; + } +#endif // QT_NO_SCROLLAREA + availableGeometry = tlwParent->contentsRect(); + } + + // Find frame geometries, title bar height, and decoration sizes. + const QRect frameGeometry = tlw->frameGeometry(); + const int titleBarHeight = qMax(tlw->geometry().y() - frameGeometry.y(), 0); + const int bottomDecoration = qMax(frameGeometry.height() - tlw->height() - titleBarHeight, 0); + const int leftRightDecoration = qMax((frameGeometry.width() - tlw->width()) / 2, 0); + + // Determine dyMax depending on whether the sizegrip is at the bottom + // of the widget or not. + if (d->atBottom()) { + if (hasVerticalSizeConstraint) + d->dyMax = availableGeometry.bottom() - d->r.bottom() - bottomDecoration; + else + d->dyMax = INT_MAX; + } else { + if (hasVerticalSizeConstraint) + d->dyMax = availableGeometry.y() - d->r.y() + titleBarHeight; + else + d->dyMax = -INT_MAX; + } + + // In RTL mode, the size grip is to the left; find dxMax from the desktop/workspace + // geometry, the size grip geometry and the width of the decoration. + if (d->atLeft()) { + if (hasHorizontalSizeConstraint) + d->dxMax = availableGeometry.x() - d->r.x() + leftRightDecoration; + else + d->dxMax = -INT_MAX; + } else { + if (hasHorizontalSizeConstraint) + d->dxMax = availableGeometry.right() - d->r.right() - leftRightDecoration; + else + d->dxMax = INT_MAX; + } +} + + +/*! + \fn void QSizeGrip::mouseMoveEvent(QMouseEvent * event) + Resizes the top-level widget containing this widget. The mouse + move event is passed in the \a event parameter. +*/ +void QSizeGrip::mouseMoveEvent(QMouseEvent * e) +{ + if (e->buttons() != Qt::LeftButton) { + QWidget::mouseMoveEvent(e); + return; + } + + Q_D(QSizeGrip); + QWidget* tlw = qt_sizegrip_topLevelWidget(this); + if (!d->gotMousePress || tlw->testAttribute(Qt::WA_WState_ConfigPending)) + return; + +#ifdef Q_WS_X11 + if (tlw->isWindow() && X11->isSupportedByWM(ATOM(_NET_WM_MOVERESIZE)) + && tlw->isTopLevel() && !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !hasHeightForWidth(tlw)) + return; +#endif +#ifdef Q_WS_WIN + if (tlw->isWindow() && GetSystemMenu(tlw->winId(), FALSE) != 0 && internalWinId() + && !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !hasHeightForWidth(tlw)) { + MSG msg; + while(PeekMessage(&msg, winId(), WM_MOUSEMOVE, WM_MOUSEMOVE, PM_REMOVE)); + return; + } +#endif + + QPoint np(e->globalPos()); + + // Don't extend beyond the available geometry; bound to dyMax and dxMax. + QSize ns; + if (d->atBottom()) + ns.rheight() = d->r.height() + qMin(np.y() - d->p.y(), d->dyMax); + else + ns.rheight() = d->r.height() - qMax(np.y() - d->p.y(), d->dyMax); + + if (d->atLeft()) + ns.rwidth() = d->r.width() - qMax(np.x() - d->p.x(), d->dxMax); + else + ns.rwidth() = d->r.width() + qMin(np.x() - d->p.x(), d->dxMax); + + ns = QLayout::closestAcceptableSize(tlw, ns); + + QPoint p; + QRect nr(p, ns); + if (d->atBottom()) { + if (d->atLeft()) + nr.moveTopRight(d->r.topRight()); + else + nr.moveTopLeft(d->r.topLeft()); + } else { + if (d->atLeft()) + nr.moveBottomRight(d->r.bottomRight()); + else + nr.moveBottomLeft(d->r.bottomLeft()); + } + + tlw->setGeometry(nr); +} + +/*! + \reimp +*/ +void QSizeGrip::mouseReleaseEvent(QMouseEvent *mouseEvent) +{ + if (mouseEvent->button() == Qt::LeftButton) { + Q_D(QSizeGrip); + d->gotMousePress = false; + d->p = QPoint(); + } else { + QWidget::mouseReleaseEvent(mouseEvent); + } +} + +/*! + \reimp +*/ +void QSizeGrip::moveEvent(QMoveEvent * /*moveEvent*/) +{ + Q_D(QSizeGrip); + // We're inside a resize operation; no update necessary. + if (!d->p.isNull()) + return; + + d->m_corner = d->corner(); +#if !defined(QT_NO_CURSOR) && !defined(Q_WS_MAC) + setCursor(d->m_corner == Qt::TopLeftCorner || d->m_corner == Qt::BottomRightCorner + ? Qt::SizeFDiagCursor : Qt::SizeBDiagCursor); +#endif +} + +/*! + \reimp +*/ +void QSizeGrip::showEvent(QShowEvent *showEvent) +{ +#ifdef Q_WS_MAC + d_func()->updateMacSizer(false); +#endif + QWidget::showEvent(showEvent); +} + +/*! + \reimp +*/ +void QSizeGrip::hideEvent(QHideEvent *hideEvent) +{ +#ifdef Q_WS_MAC + d_func()->updateMacSizer(true); +#endif + QWidget::hideEvent(hideEvent); +} + +/*! + \reimp +*/ +void QSizeGrip::setVisible(bool visible) +{ + QWidget::setVisible(visible); +} + +/*! \reimp */ +bool QSizeGrip::eventFilter(QObject *o, QEvent *e) +{ + if ((isHidden() && testAttribute(Qt::WA_WState_ExplicitShowHide)) + || e->type() != QEvent::WindowStateChange) { + return QWidget::eventFilter(o, e); + } + QWidget *tlw = qt_sizegrip_topLevelWidget(this); + if (o != tlw) + return QWidget::eventFilter(o, e); + Qt::WindowStates sizeGripNotVisibleState = Qt::WindowFullScreen; +#ifndef Q_WS_MAC + sizeGripNotVisibleState |= Qt::WindowMaximized; +#endif + // Don't show the size grip if the tlw is maximized or in full screen mode. + setVisible(!(tlw->windowState() & sizeGripNotVisibleState)); + setAttribute(Qt::WA_WState_ExplicitShowHide, false); + return QWidget::eventFilter(o, e); +} + +/*! + \reimp +*/ +bool QSizeGrip::event(QEvent *event) +{ + return QWidget::event(event); +} + +#ifdef Q_WS_WIN +/*! \reimp */ +bool QSizeGrip::winEvent( MSG *m, long *result ) +{ + return QWidget::winEvent(m, result); +} +#endif + +QT_END_NAMESPACE + +#include "moc_qsizegrip.cpp" + +#endif //QT_NO_SIZEGRIP |