qwidgetresizehandler
qwidgetresizehandler_p.h
/**************************************************************************** ** ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/ ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** GNU Lesser General Public License Usage ** 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. ** ** 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. ** ** Other Usage ** Alternatively, this file may be used in accordance with the terms and ** conditions contained in a signed written agreement between you and Nokia. ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #ifndef QWIDGETRESIZEHANDLER_P_H #define QWIDGETRESIZEHANDLER_P_H // // W A R N I N G // ------------- // // This file is not part of the Qt API. This header file may // change from version to version without notice, or even be // removed. // // We mean it. // #include "QtCore/qobject.h" #include "QtCore/qpoint.h" #ifndef QT_NO_RESIZEHANDLER QT_BEGIN_NAMESPACE class QMouseEvent; class QKeyEvent; class Q_GUI_EXPORT QWidgetResizeHandler : public QObject { Q_OBJECT public: enum Action { Move = 0x01, Resize = 0x02, Any = Move|Resize }; explicit QWidgetResizeHandler(QWidget *parent, QWidget *cw = 0); void setActive(bool b) { setActive(Any, b); } void setActive(Action ac, bool b); bool isActive() const { return isActive(Any); } bool isActive(Action ac) const; void setMovingEnabled(bool b) { movingEnabled = b; } bool isMovingEnabled() const { return movingEnabled; } bool isButtonDown() const { return buttonDown; } void setExtraHeight(int h) { extrahei = h; } void setSizeProtection(bool b) { sizeprotect = b; } void setFrameWidth(int w) { fw = w; } void doResize(); void doMove(); Q_SIGNALS: void activate(); protected: bool eventFilter(QObject *o, QEvent *e); void mouseMoveEvent(QMouseEvent *e); void keyPressEvent(QKeyEvent *e); private: Q_DISABLE_COPY(QWidgetResizeHandler) enum MousePosition { Nowhere, TopLeft, BottomRight, BottomLeft, TopRight, Top, Bottom, Left, Right, Center }; QWidget *widget; QWidget *childWidget; QPoint moveOffset; QPoint invertedMoveOffset; MousePosition mode; int fw; int extrahei; int range; uint buttonDown :1; uint moveResizeMode :1; uint activeForResize :1; uint sizeprotect :1; uint movingEnabled :1; uint activeForMove :1; void setMouseCursor(MousePosition m); bool isMove() const { return moveResizeMode && mode == Center; } bool isResize() const { return moveResizeMode && !isMove(); } }; QT_END_NAMESPACE #endif // QT_NO_RESIZEHANDLER #endif // QWIDGETRESIZEHANDLER_P_H
qwidgetresizehandler.cpp
/**************************************************************************** ** ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/ ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** GNU Lesser General Public License Usage ** 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. ** ** 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. ** ** Other Usage ** Alternatively, this file may be used in accordance with the terms and ** conditions contained in a signed written agreement between you and Nokia. ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #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
来自:https://github.com/openwebos/qt/tree/master/src/gui/widgets
QQ 3087438119