--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/widgets/qsizegrip.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,564 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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 "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() || !parent)
+ 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 mainwindow-classes
+ \ingroup basicwidgets
+
+ 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();
+ PostMessage(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