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Diffstat (limited to 'src/gui/widgets/qwidgetresizehandler.cpp')
| -rw-r--r-- | src/gui/widgets/qwidgetresizehandler.cpp | 547 |
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 0000000..9171244 --- /dev/null +++ b/src/gui/widgets/qwidgetresizehandler.cpp @@ -0,0 +1,547 @@ +/**************************************************************************** +** +** 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 "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 = qApp->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 |