/**************************************************************************** | |
** | |
** 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 Qt Designer 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 "zoomwidget_p.h" | |
#include <QtGui/QGraphicsScene> | |
#include <QtGui/QGraphicsProxyWidget> | |
#include <QtGui/QMenu> | |
#include <QtGui/QAction> | |
#include <QtGui/QActionGroup> | |
#include <QtGui/QContextMenuEvent> | |
#include <QtGui/QScrollBar> | |
#include <QtCore/QTextStream> | |
#include <QtCore/qmath.h> | |
#include <QtCore/QDebug> | |
#include <QtCore/QList> | |
QT_BEGIN_NAMESPACE | |
typedef QList<QAction*> ActionList; | |
typedef QList<QGraphicsItem *> GraphicsItemList; | |
enum { debugZoomWidget = 0 }; | |
static const int menuZoomList[] = { 100, 25, 50, 75, 125, 150 , 175, 200 }; | |
static inline QSize qCeiling(const QSizeF &s) | |
{ | |
return QSize(qCeil(s.width()), qCeil(s.height())); | |
} | |
namespace qdesigner_internal { | |
// ---------- ZoomMenu | |
ZoomMenu::ZoomMenu(QObject *parent) : | |
QObject(parent), | |
m_menuActions(new QActionGroup(this)) | |
{ | |
connect(m_menuActions, SIGNAL(triggered(QAction*)), this, SLOT(slotZoomMenu(QAction*))); | |
const int nz = sizeof(menuZoomList)/sizeof(int); | |
for (int i = 0; i < nz; i++) { | |
const int zoom = menuZoomList[i]; | |
//: Zoom factor | |
QAction *a = m_menuActions->addAction(tr("%1 %").arg(zoom)); | |
a->setCheckable(true); | |
a->setData(QVariant(zoom)); | |
if (zoom == 100) | |
a->setChecked(true); | |
m_menuActions->addAction(a); | |
} | |
} | |
int ZoomMenu::zoomOf(const QAction *a) | |
{ | |
return a->data().toInt(); | |
} | |
void ZoomMenu::addActions(QMenu *m) | |
{ | |
const ActionList za = m_menuActions->actions(); | |
const ActionList::const_iterator cend = za.constEnd(); | |
for (ActionList::const_iterator it = za.constBegin(); it != cend; ++it) { | |
m->addAction(*it); | |
if (zoomOf(*it) == 100) | |
m->addSeparator(); | |
} | |
} | |
int ZoomMenu::zoom() const | |
{ | |
return m_menuActions->checkedAction()->data().toInt(); | |
} | |
void ZoomMenu::setZoom(int percent) | |
{ | |
const ActionList za = m_menuActions->actions(); | |
const ActionList::const_iterator cend = za.constEnd(); | |
for (ActionList::const_iterator it = za.constBegin(); it != cend; ++it) | |
if (zoomOf(*it) == percent) { | |
(*it)->setChecked(true); | |
return; | |
} | |
} | |
void ZoomMenu::slotZoomMenu(QAction *a) | |
{ | |
emit zoomChanged(zoomOf(a)); | |
} | |
QList<int> ZoomMenu::zoomValues() | |
{ | |
QList<int> rc; | |
const int nz = sizeof(menuZoomList)/sizeof(int); | |
for (int i = 0; i < nz; i++) | |
rc.push_back(menuZoomList[i]); | |
return rc; | |
} | |
// --------- ZoomView | |
ZoomView::ZoomView(QWidget *parent) : | |
QGraphicsView(parent), | |
m_scene(new QGraphicsScene(this)), | |
m_zoom(100), | |
m_zoomFactor(1.0), | |
m_zoomContextMenuEnabled(false), | |
m_zoomMenu(0) | |
{ | |
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); | |
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); | |
setFrameShape(QFrame::NoFrame); | |
setScene(m_scene); | |
if (debugZoomWidget) | |
qDebug() << "scene" << m_scene->sceneRect(); | |
} | |
int ZoomView::zoom() const | |
{ | |
return m_zoom; | |
} | |
void ZoomView::scrollToOrigin() | |
{ | |
const QPoint origin(0 ,0); | |
const QPoint current = scrollPosition(); | |
if (current != origin) { | |
if (debugZoomWidget) | |
qDebug() << "ZoomView::scrollToOrigin from " << current; | |
setScrollPosition(origin); | |
} | |
} | |
void ZoomView::setZoom(int percent) | |
{ | |
if (debugZoomWidget) | |
qDebug() << "ZoomView::setZoom" << percent; | |
if (m_zoom == percent) | |
return; | |
m_zoom = percent; | |
const qreal hundred = 100.0; | |
m_zoomFactor = static_cast<qreal>(m_zoom) / hundred; | |
applyZoom(); | |
if (m_zoomMenu) // Do not force them into existence | |
m_zoomMenu->setZoom(m_zoom); | |
resetTransform(); | |
scale(m_zoomFactor, m_zoomFactor); | |
} | |
void ZoomView::applyZoom() | |
{ | |
} | |
qreal ZoomView::zoomFactor() const | |
{ | |
return m_zoomFactor; | |
} | |
bool ZoomView::isZoomContextMenuEnabled() const | |
{ | |
return m_zoomContextMenuEnabled; | |
} | |
void ZoomView::setZoomContextMenuEnabled(bool e) | |
{ | |
m_zoomContextMenuEnabled = e; | |
} | |
ZoomMenu *ZoomView::zoomMenu() | |
{ | |
if (!m_zoomMenu) { | |
m_zoomMenu = new ZoomMenu(this); | |
m_zoomMenu->setZoom(m_zoom); | |
connect(m_zoomMenu, SIGNAL(zoomChanged(int)), this, SLOT(setZoom(int))); | |
} | |
return m_zoomMenu; | |
} | |
void ZoomView::contextMenuEvent(QContextMenuEvent *event) | |
{ | |
if (debugZoomWidget > 1) | |
qDebug() << "ZoomView::contextMenuEvent" << event->pos() << event->globalPos() << zoom() << '%'; | |
if (m_zoomContextMenuEnabled) { | |
showContextMenu(event->globalPos()); | |
} else { | |
QGraphicsView::contextMenuEvent(event); | |
} | |
} | |
void ZoomView::showContextMenu(const QPoint &globalPos) | |
{ | |
QMenu menu; | |
zoomMenu()->addActions(&menu); | |
if (debugZoomWidget) { | |
menu.addSeparator(); | |
QAction *da = menu.addAction(QLatin1String("Dump")); | |
connect(da, SIGNAL(triggered()), this, SLOT(dump())); | |
} | |
menu.exec(globalPos); | |
} | |
QPoint ZoomView::scrollPosition() const | |
{ | |
return QPoint(horizontalScrollBar()->value(), verticalScrollBar()->value()); | |
} | |
void ZoomView::setScrollPosition(const QPoint& pos) | |
{ | |
horizontalScrollBar()->setValue(pos.x()); | |
verticalScrollBar()->setValue(pos.y()); | |
} | |
// -------------- ZoomProxyWidget | |
ZoomProxyWidget::ZoomProxyWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags) : | |
QGraphicsProxyWidget(parent, wFlags) | |
{ | |
} | |
QVariant ZoomProxyWidget::itemChange(GraphicsItemChange change, const QVariant &value) | |
{ | |
switch (change) { | |
case ItemPositionChange: { | |
const QPointF newPos = value.toPointF(); | |
const QPointF desiredPos = QPointF(0, 0); | |
if (newPos != desiredPos && debugZoomWidget) | |
qDebug() << "ZoomProxyWidget::itemChange: refusing " << newPos; | |
return desiredPos; | |
} | |
default: | |
break; | |
} | |
return QGraphicsProxyWidget::itemChange(change, value); | |
} | |
/* ZoomedEventFilterRedirector: Event filter for the zoomed widget. | |
* It redirects the events to another handler of ZoomWidget as its | |
* base class QScrollArea also implements eventFilter() for its viewport. */ | |
static const char *zoomedEventFilterRedirectorNameC = "__qt_ZoomedEventFilterRedirector"; | |
class ZoomedEventFilterRedirector : public QObject { | |
Q_DISABLE_COPY(ZoomedEventFilterRedirector) | |
public: | |
explicit ZoomedEventFilterRedirector(ZoomWidget *zw, QObject *parent); | |
virtual bool eventFilter(QObject *watched, QEvent *event); | |
private: | |
ZoomWidget *m_zw; | |
}; | |
ZoomedEventFilterRedirector::ZoomedEventFilterRedirector(ZoomWidget *zw, QObject *parent) : | |
QObject(parent), | |
m_zw(zw) | |
{ | |
setObjectName(QLatin1String(zoomedEventFilterRedirectorNameC)); | |
} | |
bool ZoomedEventFilterRedirector::eventFilter(QObject *watched, QEvent *event) | |
{ | |
return m_zw->zoomedEventFilter(watched, event); | |
} | |
// --------- ZoomWidget | |
ZoomWidget::ZoomWidget(QWidget *parent) : | |
ZoomView(parent), | |
m_proxy(0), | |
m_viewResizeBlocked(false), | |
m_widgetResizeBlocked(false), | |
m_widgetZoomContextMenuEnabled(false) | |
{ | |
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); | |
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); | |
} | |
void ZoomWidget::setWidget(QWidget *w, Qt::WindowFlags wFlags) | |
{ | |
if (debugZoomWidget) | |
qDebug() << "ZoomWidget::setWidget" << w << bin << wFlags; | |
if (m_proxy) { | |
scene().removeItem(m_proxy); | |
if (QWidget *w = m_proxy->widget()) { | |
// remove the event filter | |
if (QObject *evf = qFindChild<QObject*>(w, QLatin1String(zoomedEventFilterRedirectorNameC))) | |
w->removeEventFilter(evf); | |
} | |
m_proxy->deleteLater(); | |
} | |
// Set window flags on the outer proxy for them to take effect | |
m_proxy = createProxyWidget(0, Qt::Window); | |
m_proxy->setWidget(w); | |
m_proxy->setWindowFlags(wFlags); | |
scene().addItem(m_proxy); | |
w->installEventFilter(new ZoomedEventFilterRedirector(this, w)); | |
resizeToWidgetSize(); // Do manually for new widget | |
m_proxy->show(); | |
} | |
bool ZoomWidget::isWidgetZoomContextMenuEnabled() const | |
{ | |
return m_widgetZoomContextMenuEnabled; | |
} | |
void ZoomWidget::setWidgetZoomContextMenuEnabled(bool e) | |
{ | |
m_widgetZoomContextMenuEnabled = e; | |
} | |
QSize ZoomWidget::viewPortMargin() const | |
{ | |
return QSize(0, 0); | |
} | |
QSizeF ZoomWidget::widgetDecorationSizeF() const | |
{ | |
qreal left, top, right, bottom; | |
m_proxy->getWindowFrameMargins (&left, &top, &right, &bottom); | |
const QSizeF rc = QSizeF(left + right, top + bottom); | |
return rc; | |
} | |
QSize ZoomWidget::widgetSize() const | |
{ | |
if (m_proxy) | |
return m_proxy->widget()->size(); | |
return QSize(0, 0); | |
} | |
/* Convert widget size to QGraphicsView size. | |
* Watch out for limits (0, QWIDGETSIZE_MAX); just pass them on */ | |
QSize ZoomWidget::widgetSizeToViewSize(const QSize &s, bool *ptrToValid) const | |
{ | |
const QSize vpMargin = viewPortMargin(); | |
const QSizeF deco = widgetDecorationSizeF(); | |
const int width = s.width(); | |
QSize rc = s; | |
bool valid = false; | |
if (width != 0 && width != QWIDGETSIZE_MAX) { | |
valid = true; | |
rc.setWidth(vpMargin.width() + qCeil(deco.width() + zoomFactor() * static_cast<qreal>(width))); | |
} | |
const int height = s.height(); | |
if (height != 0 && height != QWIDGETSIZE_MAX) { | |
valid = true; | |
rc.setHeight(vpMargin.height() + qCeil(deco.height() + zoomFactor() * static_cast<qreal>(height))); | |
} | |
if (ptrToValid) | |
*ptrToValid = valid; | |
return rc; | |
} | |
// On changing zoom: Make QGraphicsView big enough to hold the widget | |
void ZoomWidget::resizeToWidgetSize() | |
{ | |
if (!m_proxy) | |
return; | |
m_viewResizeBlocked = true; | |
// Convert size, apply transformed min/max size if applicable | |
const QSize wsize = widgetSize(); | |
const QSize viewSize = widgetSizeToViewSize(wsize); | |
bool hasMinimumSize = false; | |
const QSize minimumSize = m_proxy->widget()->minimumSize(); | |
const QSize viewMinimumSize = widgetSizeToViewSize(minimumSize, &hasMinimumSize); | |
bool hasMaximumSize = false; | |
const QSize maximumSize = m_proxy->widget()->maximumSize(); | |
const QSize viewMaximumSize = widgetSizeToViewSize(maximumSize, &hasMaximumSize); | |
if (debugZoomWidget) { | |
qDebug() | |
<< "ZoomWidget::resizeToWidgetSize()\n" | |
<< "Widget: " << wsize << "(scaled)" << (wsize * zoomFactor()) << " Min/Max" << minimumSize << maximumSize << '\n' | |
<< " View: " << viewSize << hasMinimumSize << viewMinimumSize << hasMaximumSize << viewMaximumSize; | |
} | |
// Apply | |
if (hasMinimumSize) | |
setMinimumSize(viewMinimumSize); | |
if (hasMaximumSize) | |
setMaximumSize(viewMaximumSize); | |
// now resize | |
doResize(viewSize); | |
if (debugZoomWidget) | |
qDebug() << "ZoomWidget::resizeToWidgetSize(): resulting view size" << size(); | |
m_viewResizeBlocked = false; | |
} | |
void ZoomWidget::applyZoom() | |
{ | |
resizeToWidgetSize(); | |
} | |
/* virtual */ void ZoomWidget::doResize(const QSize &s) | |
{ | |
if (debugZoomWidget > 1) | |
qDebug() << ">ZoomWidget::doResize() " << s; | |
resize(s); | |
} | |
void ZoomWidget::resizeEvent(QResizeEvent *event) | |
{ | |
/* QGraphicsView Resized from outside: Adapt widget. For some reason, | |
* the size passed in the event is not to be trusted. This might be due | |
* to some QScrollArea event fiddling. Have QScrollArea resize first | |
* and the use the size ZoomView::resizeEvent(event); */ | |
if (m_proxy && !m_viewResizeBlocked) { | |
if (debugZoomWidget > 1) | |
qDebug() << '>' << Q_FUNC_INFO << size() << ")::resizeEvent from " << event->oldSize() << " to " << event->size(); | |
const QSizeF newViewPortSize = size() - viewPortMargin(); | |
const QSizeF widgetSizeF = newViewPortSize / zoomFactor() - widgetDecorationSizeF(); | |
m_widgetResizeBlocked = true; | |
m_proxy->widget()->resize(widgetSizeF.toSize()); | |
setSceneRect(QRectF(QPointF(0, 0), widgetSizeF)); | |
scrollToOrigin(); | |
m_widgetResizeBlocked = false; | |
if (debugZoomWidget > 1) | |
qDebug() << '<' << Q_FUNC_INFO << widgetSizeF << m_proxy->widget()->size() << m_proxy->size(); | |
} | |
} | |
QSize ZoomWidget::minimumSizeHint() const | |
{ | |
if (!m_proxy) | |
return QGraphicsView::minimumSizeHint(); | |
const QSizeF wmsh = m_proxy->widget()->minimumSizeHint(); | |
const QSize rc = viewPortMargin() + (wmsh * zoomFactor()).toSize(); | |
if (debugZoomWidget > 1) | |
qDebug() << "minimumSizeHint()" << rc; | |
return rc; | |
} | |
QSize ZoomWidget::sizeHint() const | |
{ | |
if (!m_proxy) | |
return QGraphicsView::sizeHint(); | |
const QSizeF wsh = m_proxy->widget()->sizeHint(); | |
const QSize rc = viewPortMargin() + (wsh * zoomFactor()).toSize(); | |
if (debugZoomWidget > 1) | |
qDebug() << "sizeHint()" << rc; | |
return rc; | |
} | |
bool ZoomWidget::zoomedEventFilter(QObject * /*watched*/, QEvent *event) | |
{ | |
switch (event->type()) { | |
case QEvent::KeyPress: | |
if (debugZoomWidget) { // Debug helper: Press 'D' on the zoomed widget | |
const QKeyEvent *kevent = static_cast<QKeyEvent*>(event); | |
if (kevent->key() == Qt::Key_D) | |
dump(); | |
} | |
break; | |
case QEvent::Resize: | |
if (debugZoomWidget > 1) { | |
const QResizeEvent *re = static_cast<const QResizeEvent *>(event); | |
qDebug() << "ZoomWidget::zoomedEventFilter" << re->oldSize() << re->size() << " at " << m_proxy->widget()->geometry(); | |
} | |
if (!m_widgetResizeBlocked) | |
resizeToWidgetSize(); | |
break; | |
case QEvent::ContextMenu: | |
if (m_widgetZoomContextMenuEnabled) { | |
// Calculate global position from scaled | |
QContextMenuEvent *ce = static_cast<QContextMenuEvent*>(event); | |
const QPointF origin = mapToGlobal(QPoint(0, 0)) - scrollPosition(); | |
const QPointF pos = QPointF(origin + (QPointF(ce->pos()) * zoomFactor())); | |
showContextMenu(pos.toPoint()); | |
ce->accept(); | |
return true; | |
} | |
break; | |
default: | |
break; | |
} | |
return false; | |
} | |
void ZoomWidget::setItemAcceptDrops(bool) | |
{ | |
if (m_proxy) | |
m_proxy->setAcceptDrops(true); | |
} | |
bool ZoomWidget::itemAcceptDrops() const | |
{ | |
return m_proxy ? m_proxy->acceptDrops() : false; | |
} | |
// Factory function for QGraphicsProxyWidgets which can be overwritten. Default creates a ZoomProxyWidget | |
QGraphicsProxyWidget *ZoomWidget::createProxyWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags) const | |
{ | |
return new ZoomProxyWidget(parent, wFlags); | |
} | |
void ZoomWidget::dump() const | |
{ | |
qDebug() << "ZoomWidget::dump " << geometry() << " Viewport " << viewport()->geometry() | |
<< "Scroll: " << scrollPosition() << "Matrix: " << matrix() << " SceneRect: " << sceneRect(); | |
if (m_proxy) { | |
qDebug() << "Proxy Pos: " << m_proxy->pos() << "Proxy " << m_proxy->size() | |
<< "\nProxy size hint" | |
<< m_proxy->effectiveSizeHint(Qt::MinimumSize) | |
<< m_proxy->effectiveSizeHint(Qt::PreferredSize) | |
<< m_proxy->effectiveSizeHint(Qt::MaximumSize) | |
<< "\nMatrix: " << m_proxy->matrix() | |
<< "\nWidget: " << m_proxy->widget()->geometry() | |
<< "scaled" << (zoomFactor() * m_proxy->widget()->size()); | |
} | |
} | |
} // namespace qdesigner_internal | |
QT_END_NAMESPACE |