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Diffstat (limited to 'examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp')
-rw-r--r-- | examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp b/examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp new file mode 100644 index 0000000000..2aa2986014 --- /dev/null +++ b/examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp @@ -0,0 +1,167 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the demonstration applications 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 "customproxy.h" + +#include <QtWidgets> + +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(); +} |