customproxy.cpp Example File

graphicsview/embeddeddialogs/customproxy.cpp
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#include "customproxy.h" #include <QStyleOptionGraphicsItem> #include <QPainter> #include <QGraphicsScene> CustomProxy::CustomProxy(QGraphicsItem *parent, Qt::WindowFlags wFlags) : QGraphicsProxyWidget(parent, wFlags), popupShown(false), currentPopup(0) { timeLine = new QTimeLine(250, this); connect(timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(updateStep(qreal))); connect(timeLine, SIGNAL(stateChanged(QTimeLine::State)), this, SLOT(stateChanged(QTimeLine::State))); } QRectF CustomProxy::boundingRect() const { return QGraphicsProxyWidget::boundingRect().adjusted(0, 0, 10, 10); } void CustomProxy::paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { const QColor color(0, 0, 0, 64); QRectF r = windowFrameRect(); QRectF right(r.right(), r.top() + 10, 10, r.height() - 10); QRectF bottom(r.left() + 10, r.bottom(), r.width(), 10); bool intersectsRight = right.intersects(option->exposedRect); bool intersectsBottom = bottom.intersects(option->exposedRect); if (intersectsRight && intersectsBottom) { QPainterPath path; path.addRect(right); path.addRect(bottom); painter->setPen(Qt::NoPen); painter->setBrush(color); painter->drawPath(path); } else if (intersectsBottom) { painter->fillRect(bottom, color); } else if (intersectsRight) { painter->fillRect(right, color); } QGraphicsProxyWidget::paintWindowFrame(painter, option, widget); } void CustomProxy::hoverEnterEvent(QGraphicsSceneHoverEvent *event) { QGraphicsProxyWidget::hoverEnterEvent(event); scene()->setActiveWindow(this); if (timeLine->currentValue() != 1) zoomIn(); } void CustomProxy::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) { QGraphicsProxyWidget::hoverLeaveEvent(event); if (!popupShown && (timeLine->direction() != QTimeLine::Backward || timeLine->currentValue() != 0)) { zoomOut(); } } bool CustomProxy::sceneEventFilter(QGraphicsItem *watched, QEvent *event) { if (watched->isWindow() && (event->type() == QEvent::UngrabMouse || event->type() == QEvent::GrabMouse)) { popupShown = watched->isVisible(); if (!popupShown && !isUnderMouse()) zoomOut(); } return QGraphicsProxyWidget::sceneEventFilter(watched, event); } QVariant CustomProxy::itemChange(GraphicsItemChange change, const QVariant &value) { if (change == ItemChildAddedChange || change == ItemChildRemovedChange) { if (change == ItemChildAddedChange) { currentPopup = qvariant_cast<QGraphicsItem *>(value); currentPopup->setCacheMode(ItemCoordinateCache); if (scene()) currentPopup->installSceneEventFilter(this); } else if (scene()) { currentPopup->removeSceneEventFilter(this); currentPopup = 0; } } else if (currentPopup && change == ItemSceneHasChanged) { currentPopup->installSceneEventFilter(this); } return QGraphicsProxyWidget::itemChange(change, value); } void CustomProxy::updateStep(qreal step) { QRectF r = boundingRect(); setTransform(QTransform() .translate(r.width() / 2, r.height() / 2) .rotate(step * 30, Qt::XAxis) .rotate(step * 10, Qt::YAxis) .rotate(step * 5, Qt::ZAxis) .scale(1 + 1.5 * step, 1 + 1.5 * step) .translate(-r.width() / 2, -r.height() / 2)); } void CustomProxy::stateChanged(QTimeLine::State state) { if (state == QTimeLine::Running) { if (timeLine->direction() == QTimeLine::Forward) setCacheMode(ItemCoordinateCache); } else if (state == QTimeLine::NotRunning) { if (timeLine->direction() == QTimeLine::Backward) setCacheMode(DeviceCoordinateCache); } } void CustomProxy::zoomIn() { if (timeLine->direction() != QTimeLine::Forward) timeLine->setDirection(QTimeLine::Forward); if (timeLine->state() == QTimeLine::NotRunning) timeLine->start(); } void CustomProxy::zoomOut() { if (timeLine->direction() != QTimeLine::Backward) timeLine->setDirection(QTimeLine::Backward); if (timeLine->state() == QTimeLine::NotRunning) timeLine->start(); }