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50
51#include <QApplication>
52#include <QLabel>
53#include <QGraphicsAnchorLayout>
54#include <QGraphicsProxyWidget>
55#include <QGraphicsScene>
56#include <QGraphicsSceneResizeEvent>
57#include <QGraphicsView>
58#include <QGraphicsWidget>
59#include <QPainter>
60#include <QPushButton>
61
62
63class GraphicsView : public QGraphicsView
64{
65public:
66 GraphicsView(QGraphicsScene *scene, QGraphicsWidget *widget)
67 : QGraphicsView(scene), w(widget)
68 {
69 }
70
71 void resizeEvent(QResizeEvent *event) override
72 {
73 w->setGeometry(ax: 0, ay: 0, aw: event->size().width(), ah: event->size().height());
74 }
75
76 QGraphicsWidget *w;
77};
78
79class PixmapWidget : public QGraphicsLayoutItem
80{
81public:
82 PixmapWidget(const QPixmap &pix)
83 : QGraphicsLayoutItem(), original(new QGraphicsPixmapItem(pix))
84 , r(QRectF(QPointF(0, 0), pix.size()))
85 {
86 setGraphicsItem(original);
87 original->show();
88 }
89
90 ~PixmapWidget()
91 {
92 setGraphicsItem(nullptr);
93 delete original;
94 }
95
96 void setZValue(qreal z)
97 {
98 original->setZValue(z);
99 }
100
101 void setGeometry(const QRectF &rect) override
102 {
103 original->setTransform(matrix: QTransform::fromScale(dx: rect.width() / r.width(),
104 dy: rect.height() / r.height()), combine: true);
105 original->setPos(ax: rect.x(), ay: rect.y());
106 r = rect;
107 }
108
109protected:
110 QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const override
111 {
112 Q_UNUSED(constraint);
113 QSizeF sh;
114 switch (which) {
115 case Qt::MinimumSize:
116 sh = QSizeF(0, 0);
117 break;
118 case Qt::PreferredSize:
119 sh = QSizeF(50, 50);
120 break;
121 case Qt::MaximumSize:
122 sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
123 break;
124 default:
125 break;
126 }
127 return sh;
128 }
129
130private:
131 QGraphicsPixmapItem *original;
132 QRectF r;
133};
134
135
136class PlaceWidget : public QGraphicsWidget
137{
138 Q_OBJECT
139
140public:
141 PlaceWidget(const QPixmap &pix)
142 : QGraphicsWidget()
143 , original(pix)
144 , scaled(pix)
145 {
146 }
147
148 void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) override
149 {
150 const QPointF reflection(0, scaled.height() + 2);
151
152 painter->drawPixmap(p: QPointF(), pm: scaled);
153
154 QPixmap tmp(scaled.size());
155 tmp.fill(fillColor: Qt::transparent);
156 QPainter p(&tmp);
157
158 // create gradient
159 QPoint p1(scaled.width() / 2, 0);
160 QPoint p2(scaled.width() / 2, scaled.height());
161 QLinearGradient linearGrad(p1, p2);
162 linearGrad.setColorAt(pos: 0, color: QColor(0, 0, 0, 0));
163 linearGrad.setColorAt(pos: 0.65, color: QColor(0, 0, 0, 127));
164 linearGrad.setColorAt(pos: 1, color: QColor(0, 0, 0, 255));
165
166 // apply 'mask'
167 p.setBrush(linearGrad);
168 p.fillRect(x: 0, y: 0, w: tmp.width(), h: tmp.height(), b: QBrush(linearGrad));
169 p.fillRect(x: 0, y: 0, w: tmp.width(), h: tmp.height(), b: QBrush(linearGrad));
170
171 // paint the image flipped
172 p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
173 p.drawPixmap(x: 0, y: 0, pm: QPixmap::fromImage(image: scaled.toImage().mirrored(horizontally: false, vertically: true)));
174 p.end();
175
176 painter->drawPixmap(p: reflection, pm: tmp);
177 }
178
179 void resizeEvent(QGraphicsSceneResizeEvent *event) override
180 {
181 QSize newSize = event->newSize().toSize();
182 newSize.setHeight(newSize.height() / 2);
183 scaled = original.scaled(s: newSize);
184 }
185
186 QRectF boundingRect() const override
187 {
188 QSize size(scaled.width(), scaled.height() * 2 + 2);
189 return QRectF(QPointF(0, 0), size);
190 }
191
192private:
193 QPixmap original;
194 QPixmap scaled;
195};
196
197
198int main(int argc, char *argv[])
199{
200 Q_INIT_RESOURCE(weatheranchorlayout);
201
202 QApplication app(argc, argv);
203
204 QGraphicsScene scene;
205 scene.setSceneRect(x: 0, y: 0, w: 800, h: 480);
206
207 // pixmaps widgets
208 PixmapWidget *title = new PixmapWidget(QPixmap(":/images/title.jpg"));
209 PlaceWidget *place = new PlaceWidget(QPixmap(":/images/place.jpg"));
210 PixmapWidget *details = new PixmapWidget(QPixmap(":/images/5days.jpg"));
211 PixmapWidget *sunnyWeather = new PixmapWidget(QPixmap(":/images/weather-few-clouds.png"));
212 PixmapWidget *tabbar = new PixmapWidget(QPixmap(":/images/tabbar.jpg"));
213
214
215 // setup sizes
216 title->setPreferredSize(QSizeF(348, 45));
217 title->setSizePolicy(hPolicy: QSizePolicy::Minimum, vPolicy: QSizePolicy::Minimum);
218
219 place->setPreferredSize(QSizeF(96, 72));
220 place->setSizePolicy(hPolicy: QSizePolicy::Minimum, vPolicy: QSizePolicy::Minimum);
221
222 details->setMinimumSize(QSizeF(200, 112));
223 details->setPreferredSize(QSizeF(200, 112));
224 details->setSizePolicy(hPolicy: QSizePolicy::Minimum, vPolicy: QSizePolicy::Minimum);
225
226 tabbar->setPreferredSize(QSizeF(70, 24));
227 tabbar->setSizePolicy(hPolicy: QSizePolicy::Minimum, vPolicy: QSizePolicy::Minimum);
228
229 sunnyWeather->setPreferredSize(QSizeF(128, 97));
230 sunnyWeather->setSizePolicy(hPolicy: QSizePolicy::Minimum, vPolicy: QSizePolicy::Minimum);
231 sunnyWeather->setZValue(9999);
232
233 // start anchor layout
234 QGraphicsAnchorLayout *layout = new QGraphicsAnchorLayout;
235 layout->setSpacing(0);
236
237 // setup the main widget
238 QGraphicsWidget *widget = new QGraphicsWidget(nullptr, Qt::Window);
239 QPalette p;
240 p.setColor(acr: QPalette::Window, acolor: Qt::black);
241 widget->setPalette(p);
242 widget->setPos(ax: 20, ay: 20);
243 widget->setLayout(layout);
244
245 // vertical anchors
246 QGraphicsAnchor *anchor = layout->addAnchor(firstItem: title, firstEdge: Qt::AnchorTop, secondItem: layout, secondEdge: Qt::AnchorTop);
247 anchor = layout->addAnchor(firstItem: place, firstEdge: Qt::AnchorTop, secondItem: title, secondEdge: Qt::AnchorBottom);
248 anchor->setSpacing(12);
249 anchor = layout->addAnchor(firstItem: place, firstEdge: Qt::AnchorBottom, secondItem: layout, secondEdge: Qt::AnchorBottom);
250 anchor->setSpacing(12);
251
252 anchor = layout->addAnchor(firstItem: sunnyWeather, firstEdge: Qt::AnchorTop, secondItem: title, secondEdge: Qt::AnchorTop);
253 anchor = layout->addAnchor(firstItem: sunnyWeather, firstEdge: Qt::AnchorBottom, secondItem: layout, secondEdge: Qt::AnchorVerticalCenter);
254
255 anchor = layout->addAnchor(firstItem: tabbar, firstEdge: Qt::AnchorTop, secondItem: title, secondEdge: Qt::AnchorBottom);
256 anchor->setSpacing(5);
257 anchor = layout->addAnchor(firstItem: details, firstEdge: Qt::AnchorTop, secondItem: tabbar, secondEdge: Qt::AnchorBottom);
258 anchor->setSpacing(2);
259 anchor = layout->addAnchor(firstItem: details, firstEdge: Qt::AnchorBottom, secondItem: layout, secondEdge: Qt::AnchorBottom);
260 anchor->setSpacing(12);
261
262 // horizontal anchors
263 anchor = layout->addAnchor(firstItem: layout, firstEdge: Qt::AnchorLeft, secondItem: title, secondEdge: Qt::AnchorLeft);
264 anchor = layout->addAnchor(firstItem: title, firstEdge: Qt::AnchorRight, secondItem: layout, secondEdge: Qt::AnchorRight);
265
266 anchor = layout->addAnchor(firstItem: place, firstEdge: Qt::AnchorLeft, secondItem: layout, secondEdge: Qt::AnchorLeft);
267 anchor->setSpacing(15);
268 anchor = layout->addAnchor(firstItem: place, firstEdge: Qt::AnchorRight, secondItem: details, secondEdge: Qt::AnchorLeft);
269 anchor->setSpacing(35);
270
271 anchor = layout->addAnchor(firstItem: sunnyWeather, firstEdge: Qt::AnchorLeft, secondItem: place, secondEdge: Qt::AnchorHorizontalCenter);
272 anchor = layout->addAnchor(firstItem: sunnyWeather, firstEdge: Qt::AnchorRight, secondItem: layout, secondEdge: Qt::AnchorHorizontalCenter);
273
274 anchor = layout->addAnchor(firstItem: tabbar, firstEdge: Qt::AnchorHorizontalCenter, secondItem: details, secondEdge: Qt::AnchorHorizontalCenter);
275 anchor = layout->addAnchor(firstItem: details, firstEdge: Qt::AnchorRight, secondItem: layout, secondEdge: Qt::AnchorRight);
276
277 // QGV setup
278 scene.addItem(item: widget);
279 scene.setBackgroundBrush(Qt::white);
280 QGraphicsView *view = new QGraphicsView(&scene);
281 view->show();
282
283 return app.exec();
284}
285
286#include "main.moc"
287

source code of qtbase/examples/widgets/graphicsview/weatheranchorlayout/main.cpp