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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 547 insertions, 0 deletions

diff --git a/src/gui/widgets/qwidgetresizehandler.cpp b/src/gui/widgets/qwidgetresizehandler.cpp
new file mode 100644
index 0000000000..2d459ec1f0
--- /dev/null
+++ b/src/gui/widgets/qwidgetresizehandler.cpp
@@ -0,0 +1,547 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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 "qwidgetresizehandler_p.h"
+
+#ifndef QT_NO_RESIZEHANDLER
+#include "qframe.h"
+#include "qapplication.h"
+#include "qdesktopwidget.h"
+#include "qcursor.h"
+#include "qsizegrip.h"
+#include "qevent.h"
+#if defined(Q_WS_WIN)
+#include "qt_windows.h"
+#endif
+#include "qdebug.h"
+#include "private/qlayoutengine_p.h"
+
+QT_BEGIN_NAMESPACE
+
+#define RANGE 4
+
+static bool resizeHorizontalDirectionFixed = false;
+static bool resizeVerticalDirectionFixed = false;
+
+QWidgetResizeHandler::QWidgetResizeHandler(QWidget *parent, QWidget *cw)
+    : QObject(parent), widget(parent), childWidget(cw ? cw : parent),
+      fw(0), extrahei(0), buttonDown(false), moveResizeMode(false), sizeprotect(true), movingEnabled(true)
+{
+    mode = Nowhere;
+    widget->setMouseTracking(true);
+    QFrame *frame = qobject_cast<QFrame*>(widget);
+    range = frame ? frame->frameWidth() : RANGE;
+    range = qMax(RANGE, range);
+    activeForMove = activeForResize = true;
+    widget->installEventFilter(this);
+}
+
+void QWidgetResizeHandler::setActive(Action ac, bool b)
+{
+    if (ac & Move)
+        activeForMove = b;
+    if (ac & Resize)
+        activeForResize = b;
+
+    if (!isActive())
+        setMouseCursor(Nowhere);
+}
+
+bool QWidgetResizeHandler::isActive(Action ac) const
+{
+    bool b = false;
+    if (ac & Move) b = activeForMove;
+    if (ac & Resize) b |= activeForResize;
+
+    return b;
+}
+
+bool QWidgetResizeHandler::eventFilter(QObject *o, QEvent *ee)
+{
+    if (!isActive()
+        || (ee->type() != QEvent::MouseButtonPress
+            && ee->type() != QEvent::MouseButtonRelease
+            && ee->type() != QEvent::MouseMove
+            && ee->type() != QEvent::KeyPress
+            && ee->type() != QEvent::ShortcutOverride)
+        )
+        return false;
+
+    Q_ASSERT(o == widget);
+    QWidget *w = widget;
+    if (QApplication::activePopupWidget()) {
+        if (buttonDown && ee->type() == QEvent::MouseButtonRelease)
+            buttonDown = false;
+        return false;
+    }
+
+    QMouseEvent *e = (QMouseEvent*)ee;
+    switch (e->type()) {
+    case QEvent::MouseButtonPress: {
+        if (w->isMaximized())
+            break;
+        if (!widget->rect().contains(widget->mapFromGlobal(e->globalPos())))
+            return false;
+        if (e->button() == Qt::LeftButton) {
+#if defined(Q_WS_X11)
+            /*
+               Implicit grabs do not stop the X server from changing
+               the cursor in children, which looks *really* bad when
+               doing resizingk, so we grab the cursor. Note that we do
+               not do this on Windows since double clicks are lost due
+               to the grab (see change 198463).
+            */
+            if (e->spontaneous())
+#  if !defined(QT_NO_CURSOR)
+                widget->grabMouse(widget->cursor());
+#  else
+                widget->grabMouse();
+#  endif // QT_NO_CURSOR
+#endif // Q_WS_X11
+            buttonDown = false;
+            emit activate();
+            bool me = movingEnabled;
+            movingEnabled = (me && o == widget);
+            mouseMoveEvent(e);
+            movingEnabled = me;
+            buttonDown = true;
+            moveOffset = widget->mapFromGlobal(e->globalPos());
+            invertedMoveOffset = widget->rect().bottomRight() - moveOffset;
+            if (mode == Center) {
+                if (movingEnabled)
+                    return true;
+            } else {
+                return true;
+            }
+        }
+    } break;
+    case QEvent::MouseButtonRelease:
+        if (w->isMaximized())
+            break;
+        if (e->button() == Qt::LeftButton) {
+            moveResizeMode = false;
+            buttonDown = false;
+            widget->releaseMouse();
+            widget->releaseKeyboard();
+            if (mode == Center) {
+                if (movingEnabled)
+                    return true;
+            } else {
+                return true;
+            }
+        }
+        break;
+    case QEvent::MouseMove: {
+        if (w->isMaximized())
+            break;
+        buttonDown = buttonDown && (e->buttons() & Qt::LeftButton); // safety, state machine broken!
+        bool me = movingEnabled;
+        movingEnabled = (me && o == widget && (buttonDown || moveResizeMode));
+        mouseMoveEvent(e);
+        movingEnabled = me;
+        if (mode == Center) {
+            if (movingEnabled)
+                return true;
+        } else {
+            return true;
+        }
+    } break;
+    case QEvent::KeyPress:
+        keyPressEvent((QKeyEvent*)e);
+        break;
+    case QEvent::ShortcutOverride:
+        if (buttonDown) {
+            ((QKeyEvent*)ee)->accept();
+            return true;
+        }
+        break;
+    default:
+        break;
+    }
+
+    return false;
+}
+
+void QWidgetResizeHandler::mouseMoveEvent(QMouseEvent *e)
+{
+    QPoint pos = widget->mapFromGlobal(e->globalPos());
+    if (!moveResizeMode && !buttonDown) {
+        if (pos.y() <= range && pos.x() <= range)
+            mode = TopLeft;
+        else if (pos.y() >= widget->height()-range && pos.x() >= widget->width()-range)
+            mode = BottomRight;
+        else if (pos.y() >= widget->height()-range && pos.x() <= range)
+            mode = BottomLeft;
+        else if (pos.y() <= range && pos.x() >= widget->width()-range)
+            mode = TopRight;
+        else if (pos.y() <= range)
+            mode = Top;
+        else if (pos.y() >= widget->height()-range)
+            mode = Bottom;
+        else if (pos.x() <= range)
+            mode = Left;
+        else if ( pos.x() >= widget->width()-range)
+            mode = Right;
+        else if (widget->rect().contains(pos))
+            mode = Center;
+        else
+            mode = Nowhere;
+
+        if (widget->isMinimized() || !isActive(Resize))
+            mode = Center;
+#ifndef QT_NO_CURSOR
+        setMouseCursor(mode);
+#endif
+        return;
+    }
+
+    if (mode == Center && !movingEnabled)
+        return;
+
+    if (widget->testAttribute(Qt::WA_WState_ConfigPending))
+        return;
+
+
+    QPoint globalPos = (!widget->isWindow() && widget->parentWidget()) ?
+                       widget->parentWidget()->mapFromGlobal(e->globalPos()) : e->globalPos();
+    if (!widget->isWindow() && !widget->parentWidget()->rect().contains(globalPos)) {
+        if (globalPos.x() < 0)
+            globalPos.rx() = 0;
+        if (globalPos.y() < 0)
+            globalPos.ry() = 0;
+        if (sizeprotect && globalPos.x() > widget->parentWidget()->width())
+            globalPos.rx() = widget->parentWidget()->width();
+        if (sizeprotect && globalPos.y() > widget->parentWidget()->height())
+            globalPos.ry() = widget->parentWidget()->height();
+    }
+
+    QPoint p = globalPos + invertedMoveOffset;
+    QPoint pp = globalPos - moveOffset;
+
+#ifdef Q_WS_X11
+    // Workaround for window managers which refuse to move a tool window partially offscreen.
+    QRect desktop = QApplication::desktop()->availableGeometry(widget);
+    pp.rx() = qMax(pp.x(), desktop.left());
+    pp.ry() = qMax(pp.y(), desktop.top());
+    p.rx() = qMin(p.x(), desktop.right());
+    p.ry() = qMin(p.y(), desktop.bottom());
+#endif
+
+    QSize ms = qSmartMinSize(childWidget);
+    int mw = ms.width();
+    int mh = ms.height();
+    if (childWidget != widget) {
+        mw += 2 * fw;
+        mh += 2 * fw + extrahei;
+    }
+
+    QSize maxsize(childWidget->maximumSize());
+    if (childWidget != widget)
+        maxsize += QSize(2 * fw, 2 * fw + extrahei);
+    QSize mpsize(widget->geometry().right() - pp.x() + 1,
+                  widget->geometry().bottom() - pp.y() + 1);
+    mpsize = mpsize.expandedTo(widget->minimumSize()).expandedTo(QSize(mw, mh))
+                    .boundedTo(maxsize);
+    QPoint mp(widget->geometry().right() - mpsize.width() + 1,
+               widget->geometry().bottom() - mpsize.height() + 1);
+
+    QRect geom = widget->geometry();
+
+    switch (mode) {
+    case TopLeft:
+        geom = QRect(mp, widget->geometry().bottomRight()) ;
+        break;
+    case BottomRight:
+        geom = QRect(widget->geometry().topLeft(), p) ;
+        break;
+    case BottomLeft:
+        geom = QRect(QPoint(mp.x(), widget->geometry().y()), QPoint(widget->geometry().right(), p.y())) ;
+        break;
+    case TopRight:
+        geom = QRect(QPoint(widget->geometry().x(), mp.y()), QPoint(p.x(), widget->geometry().bottom())) ;
+        break;
+    case Top:
+        geom = QRect(QPoint(widget->geometry().left(), mp.y()), widget->geometry().bottomRight()) ;
+        break;
+    case Bottom:
+        geom = QRect(widget->geometry().topLeft(), QPoint(widget->geometry().right(), p.y())) ;
+        break;
+    case Left:
+        geom = QRect(QPoint(mp.x(), widget->geometry().top()), widget->geometry().bottomRight()) ;
+        break;
+    case Right:
+        geom = QRect(widget->geometry().topLeft(), QPoint(p.x(), widget->geometry().bottom())) ;
+        break;
+    case Center:
+        geom.moveTopLeft(pp);
+        break;
+    default:
+        break;
+    }
+
+    geom = QRect(geom.topLeft(),
+                  geom.size().expandedTo(widget->minimumSize())
+                             .expandedTo(QSize(mw, mh))
+                             .boundedTo(maxsize));
+
+    if (geom != widget->geometry() &&
+        (widget->isWindow() || widget->parentWidget()->rect().intersects(geom))) {
+        if (mode == Center)
+            widget->move(geom.topLeft());
+        else
+            widget->setGeometry(geom);
+    }
+
+    QApplication::syncX();
+}
+
+void QWidgetResizeHandler::setMouseCursor(MousePosition m)
+{
+#ifdef QT_NO_CURSOR
+    Q_UNUSED(m);
+#else
+    QObjectList children = widget->children();
+    for (int i = 0; i < children.size(); ++i) {
+        if (QWidget *w = qobject_cast<QWidget*>(children.at(i))) {
+            if (!w->testAttribute(Qt::WA_SetCursor) && !w->inherits("QWorkspaceTitleBar")) {
+                w->setCursor(Qt::ArrowCursor);
+            }
+        }
+    }
+
+    switch (m) {
+    case TopLeft:
+    case BottomRight:
+        widget->setCursor(Qt::SizeFDiagCursor);
+        break;
+    case BottomLeft:
+    case TopRight:
+        widget->setCursor(Qt::SizeBDiagCursor);
+        break;
+    case Top:
+    case Bottom:
+        widget->setCursor(Qt::SizeVerCursor);
+        break;
+    case Left:
+    case Right:
+        widget->setCursor(Qt::SizeHorCursor);
+        break;
+    default:
+        widget->setCursor(Qt::ArrowCursor);
+        break;
+    }
+#endif // QT_NO_CURSOR
+}
+
+void QWidgetResizeHandler::keyPressEvent(QKeyEvent * e)
+{
+    if (!isMove() && !isResize())
+        return;
+    bool is_control = e->modifiers() & Qt::ControlModifier;
+    int delta = is_control?1:8;
+    QPoint pos = QCursor::pos();
+    switch (e->key()) {
+    case Qt::Key_Left:
+        pos.rx() -= delta;
+        if (pos.x() <= QApplication::desktop()->geometry().left()) {
+            if (mode == TopLeft || mode == BottomLeft) {
+                moveOffset.rx() += delta;
+                invertedMoveOffset.rx() += delta;
+            } else {
+                moveOffset.rx() -= delta;
+                invertedMoveOffset.rx() -= delta;
+            }
+        }
+        if (isResize() && !resizeHorizontalDirectionFixed) {
+            resizeHorizontalDirectionFixed = true;
+            if (mode == BottomRight)
+                mode = BottomLeft;
+            else if (mode == TopRight)
+                mode = TopLeft;
+#ifndef QT_NO_CURSOR
+            setMouseCursor(mode);
+            widget->grabMouse(widget->cursor());
+#else
+            widget->grabMouse();
+#endif
+        }
+        break;
+    case Qt::Key_Right:
+        pos.rx() += delta;
+        if (pos.x() >= QApplication::desktop()->geometry().right()) {
+            if (mode == TopRight || mode == BottomRight) {
+                moveOffset.rx() += delta;
+                invertedMoveOffset.rx() += delta;
+            } else {
+                moveOffset.rx() -= delta;
+                invertedMoveOffset.rx() -= delta;
+            }
+        }
+        if (isResize() && !resizeHorizontalDirectionFixed) {
+            resizeHorizontalDirectionFixed = true;
+            if (mode == BottomLeft)
+                mode = BottomRight;
+            else if (mode == TopLeft)
+                mode = TopRight;
+#ifndef QT_NO_CURSOR
+            setMouseCursor(mode);
+            widget->grabMouse(widget->cursor());
+#else
+            widget->grabMouse();
+#endif
+        }
+        break;
+    case Qt::Key_Up:
+        pos.ry() -= delta;
+        if (pos.y() <= QApplication::desktop()->geometry().top()) {
+            if (mode == TopLeft || mode == TopRight) {
+                moveOffset.ry() += delta;
+                invertedMoveOffset.ry() += delta;
+            } else {
+                moveOffset.ry() -= delta;
+                invertedMoveOffset.ry() -= delta;
+            }
+        }
+        if (isResize() && !resizeVerticalDirectionFixed) {
+            resizeVerticalDirectionFixed = true;
+            if (mode == BottomLeft)
+                mode = TopLeft;
+            else if (mode == BottomRight)
+                mode = TopRight;
+#ifndef QT_NO_CURSOR
+            setMouseCursor(mode);
+            widget->grabMouse(widget->cursor());
+#else
+            widget->grabMouse();
+#endif
+        }
+        break;
+    case Qt::Key_Down:
+        pos.ry() += delta;
+        if (pos.y() >= QApplication::desktop()->geometry().bottom()) {
+            if (mode == BottomLeft || mode == BottomRight) {
+                moveOffset.ry() += delta;
+                invertedMoveOffset.ry() += delta;
+            } else {
+                moveOffset.ry() -= delta;
+                invertedMoveOffset.ry() -= delta;
+            }
+        }
+        if (isResize() && !resizeVerticalDirectionFixed) {
+            resizeVerticalDirectionFixed = true;
+            if (mode == TopLeft)
+                mode = BottomLeft;
+            else if (mode == TopRight)
+                mode = BottomRight;
+#ifndef QT_NO_CURSOR
+            setMouseCursor(mode);
+            widget->grabMouse(widget->cursor());
+#else
+            widget->grabMouse();
+#endif
+        }
+        break;
+    case Qt::Key_Space:
+    case Qt::Key_Return:
+    case Qt::Key_Enter:
+    case Qt::Key_Escape:
+        moveResizeMode = false;
+        widget->releaseMouse();
+        widget->releaseKeyboard();
+        buttonDown = false;
+        break;
+    default:
+        return;
+    }
+    QCursor::setPos(pos);
+}
+
+
+void QWidgetResizeHandler::doResize()
+{
+    if (!activeForResize)
+        return;
+
+    moveResizeMode = true;
+    moveOffset = widget->mapFromGlobal(QCursor::pos());
+    if (moveOffset.x() < widget->width()/2) {
+        if (moveOffset.y() < widget->height()/2)
+            mode = TopLeft;
+        else
+            mode = BottomLeft;
+    } else {
+        if (moveOffset.y() < widget->height()/2)
+            mode = TopRight;
+        else
+            mode = BottomRight;
+    }
+    invertedMoveOffset = widget->rect().bottomRight() - moveOffset;
+#ifndef QT_NO_CURSOR
+    setMouseCursor(mode);
+    widget->grabMouse(widget->cursor() );
+#else
+    widget->grabMouse();
+#endif
+    widget->grabKeyboard();
+    resizeHorizontalDirectionFixed = false;
+    resizeVerticalDirectionFixed = false;
+}
+
+void QWidgetResizeHandler::doMove()
+{
+    if (!activeForMove)
+        return;
+
+    mode = Center;
+    moveResizeMode = true;
+    moveOffset = widget->mapFromGlobal(QCursor::pos());
+    invertedMoveOffset = widget->rect().bottomRight() - moveOffset;
+#ifndef QT_NO_CURSOR
+    widget->grabMouse(Qt::SizeAllCursor);
+#else
+    widget->grabMouse();
+#endif
+    widget->grabKeyboard();
+}
+
+QT_END_NAMESPACE
+
+#endif //QT_NO_RESIZEHANDLER