Long live Qt 4.5!

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diff --git a/src/gui/widgets/qsizegrip.cpp b/src/gui/widgets/qsizegrip.cpp
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+/****************************************************************************
+**
+** 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