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50
51#include "customproxy.h"
52
53#include <QGraphicsScene>
54#include <QPainter>
55#include <QStyleOptionGraphicsItem>
56
57CustomProxy::CustomProxy(QGraphicsItem *parent, Qt::WindowFlags wFlags)
58 : QGraphicsProxyWidget(parent, wFlags), timeLine(new QTimeLine(250, this))
59{
60 connect(sender: timeLine, signal: &QTimeLine::valueChanged,
61 receiver: this, slot: &CustomProxy::updateStep);
62 connect(sender: timeLine, signal: &QTimeLine::stateChanged,
63 receiver: this, slot: &CustomProxy::stateChanged);
64}
65
66QRectF CustomProxy::boundingRect() const
67{
68 return QGraphicsProxyWidget::boundingRect().adjusted(xp1: 0, yp1: 0, xp2: 10, yp2: 10);
69}
70
71void CustomProxy::paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option,
72 QWidget *widget)
73{
74 const QColor color(0, 0, 0, 64);
75
76 QRectF r = windowFrameRect();
77 QRectF right(r.right(), r.top() + 10, 10, r.height() - 10);
78 QRectF bottom(r.left() + 10, r.bottom(), r.width(), 10);
79 bool intersectsRight = right.intersects(r: option->exposedRect);
80 bool intersectsBottom = bottom.intersects(r: option->exposedRect);
81 if (intersectsRight && intersectsBottom) {
82 QPainterPath path;
83 path.addRect(rect: right);
84 path.addRect(rect: bottom);
85 painter->setPen(Qt::NoPen);
86 painter->setBrush(color);
87 painter->drawPath(path);
88 } else if (intersectsBottom) {
89 painter->fillRect(bottom, color);
90 } else if (intersectsRight) {
91 painter->fillRect(right, color);
92 }
93
94 QGraphicsProxyWidget::paintWindowFrame(painter, option, widget);
95}
96
97void CustomProxy::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
98{
99 QGraphicsProxyWidget::hoverEnterEvent(event);
100 scene()->setActiveWindow(this);
101 if (qFuzzyCompare(p1: timeLine->currentValue(), p2: 1))
102 zoomIn();
103}
104
105void CustomProxy::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
106{
107 QGraphicsProxyWidget::hoverLeaveEvent(event);
108 if (!popupShown
109 && (timeLine->direction() != QTimeLine::Backward || qFuzzyIsNull(d: timeLine->currentValue()))) {
110 zoomOut();
111 }
112}
113
114bool CustomProxy::sceneEventFilter(QGraphicsItem *watched, QEvent *event)
115{
116 if (watched->isWindow()
117 && (event->type() == QEvent::UngrabMouse || event->type() == QEvent::GrabMouse)) {
118 popupShown = watched->isVisible();
119 if (!popupShown && !isUnderMouse())
120 zoomOut();
121 }
122 return QGraphicsProxyWidget::sceneEventFilter(watched, event);
123}
124
125QVariant CustomProxy::itemChange(GraphicsItemChange change, const QVariant &value)
126{
127 if (change == ItemChildAddedChange || change == ItemChildRemovedChange) {
128 if (change == ItemChildAddedChange) {
129 currentPopup = qvariant_cast<QGraphicsItem *>(v: value);
130 currentPopup->setCacheMode(mode: ItemCoordinateCache);
131 if (scene())
132 currentPopup->installSceneEventFilter(filterItem: this);
133 } else if (scene()) {
134 currentPopup->removeSceneEventFilter(filterItem: this);
135 currentPopup = nullptr;
136 }
137 } else if (currentPopup && change == ItemSceneHasChanged) {
138 currentPopup->installSceneEventFilter(filterItem: this);
139 }
140 return QGraphicsProxyWidget::itemChange(change, value);
141}
142
143void CustomProxy::updateStep(qreal step)
144{
145 QRectF r = boundingRect();
146 setTransform(matrix: QTransform()
147 .translate(dx: r.width() / 2, dy: r.height() / 2)
148 .rotate(a: step * 30, axis: Qt::XAxis)
149 .rotate(a: step * 10, axis: Qt::YAxis)
150 .rotate(a: step * 5, axis: Qt::ZAxis)
151 .scale(sx: 1 + 1.5 * step, sy: 1 + 1.5 * step)
152 .translate(dx: -r.width() / 2, dy: -r.height() / 2));
153}
154
155void CustomProxy::stateChanged(QTimeLine::State state)
156{
157 if (state == QTimeLine::Running) {
158 if (timeLine->direction() == QTimeLine::Forward)
159 setCacheMode(mode: ItemCoordinateCache);
160 } else if (state == QTimeLine::NotRunning) {
161 if (timeLine->direction() == QTimeLine::Backward)
162 setCacheMode(mode: DeviceCoordinateCache);
163 }
164}
165
166void CustomProxy::zoomIn()
167{
168 if (timeLine->direction() != QTimeLine::Forward)
169 timeLine->setDirection(QTimeLine::Forward);
170 if (timeLine->state() == QTimeLine::NotRunning)
171 timeLine->start();
172}
173
174void CustomProxy::zoomOut()
175{
176 if (timeLine->direction() != QTimeLine::Backward)
177 timeLine->setDirection(QTimeLine::Backward);
178 if (timeLine->state() == QTimeLine::NotRunning)
179 timeLine->start();
180}
181

source code of qtbase/examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp