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39
40 #include "qglobal.h"
41 #include "qdesktopwidget.h"
42 #include "qdesktopwidget_p.h"
43 #include "qscreen.h"
44 #include "qwidget_p.h"
45 #include "qwindow.h"
46
47 #include <private/qhighdpiscaling_p.h>
48 #include <qpa/qplatformscreen.h>
49
50 QT_BEGIN_NAMESPACE
51
QDesktopScreenWidget(QScreen * screen,const QRect & geometry)52 QDesktopScreenWidget::QDesktopScreenWidget(QScreen *screen, const QRect &geometry)
53 : QWidget(nullptr, Qt::Desktop), m_screen(screen)
54 {
55 setVisible(false);
56 if (QWindow *winHandle = windowHandle())
57 winHandle->setScreen(screen);
58 setScreenGeometry(geometry);
59 }
60
setScreenGeometry(const QRect & geometry)61 void QDesktopScreenWidget::setScreenGeometry(const QRect &geometry)
62 {
63 m_geometry = geometry;
64 setGeometry(geometry);
65 }
66
screenNumber() const67 int QDesktopScreenWidget::screenNumber() const
68 {
69 const QDesktopWidgetPrivate *desktopWidgetP
70 = static_cast<const QDesktopWidgetPrivate *>(qt_widget_private(QApplication::desktop()));
71 return desktopWidgetP->screens.indexOf(const_cast<QDesktopScreenWidget *>(this));
72 }
73
screenGeometry(const QWidget * widget) const74 const QRect QDesktopWidget::screenGeometry(const QWidget *widget) const
75 {
76 return QDesktopWidgetPrivate::screenGeometry(widget);
77 }
78
screenGeometry(const QWidget * widget)79 const QRect QDesktopWidgetPrivate::screenGeometry(const QWidget *widget)
80 {
81 if (Q_UNLIKELY(!widget)) {
82 qWarning("QDesktopWidget::screenGeometry(): Attempt "
83 "to get the screen geometry of a null widget");
84 return QRect();
85 }
86 QRect rect = QWidgetPrivate::screenGeometry(widget);
87 if (rect.isNull())
88 return screenGeometry(screenNumber(widget));
89 else return rect;
90 }
91
availableGeometry(const QWidget * widget) const92 const QRect QDesktopWidget::availableGeometry(const QWidget *widget) const
93 {
94 return QDesktopWidgetPrivate::availableGeometry(widget);
95 }
96
availableGeometry(const QWidget * widget)97 const QRect QDesktopWidgetPrivate::availableGeometry(const QWidget *widget)
98 {
99 if (Q_UNLIKELY(!widget)) {
100 qWarning("QDesktopWidget::availableGeometry(): Attempt "
101 "to get the available geometry of a null widget");
102 return QRect();
103 }
104 QRect rect = QWidgetPrivate::screenGeometry(widget);
105 if (rect.isNull())
106 return availableGeometry(screenNumber(widget));
107 else
108 return rect;
109 }
110
widgetForScreen(QScreen * qScreen) const111 QDesktopScreenWidget *QDesktopWidgetPrivate::widgetForScreen(QScreen *qScreen) const
112 {
113 foreach (QDesktopScreenWidget *widget, screens) {
114 if (widget->assignedScreen() == qScreen)
115 return widget;
116 }
117 return nullptr;
118 }
119
_q_updateScreens()120 void QDesktopWidgetPrivate::_q_updateScreens()
121 {
122 Q_Q(QDesktopWidget);
123 const QList<QScreen *> screenList = QGuiApplication::screens();
124 const int targetLength = screenList.length();
125 bool screenCountChanged = false;
126
127 // Re-build our screens list. This is the easiest way to later compute which signals to emit.
128 // Create new screen widgets as necessary. While iterating, keep the old list in place so
129 // that widgetForScreen works.
130 // Furthermore, we note which screens have changed, and compute the overall virtual geometry.
131 QList<QDesktopScreenWidget *> newScreens;
132 QList<int> changedScreens;
133 QRegion virtualGeometry;
134
135 for (int i = 0; i < targetLength; ++i) {
136 QScreen *qScreen = screenList.at(i);
137 const QRect screenGeometry = qScreen->geometry();
138 QDesktopScreenWidget *screenWidget = widgetForScreen(qScreen);
139 if (screenWidget) {
140 // an old screen. update geometry and remember the index in the *new* list
141 if (screenGeometry != screenWidget->screenGeometry()) {
142 screenWidget->setScreenGeometry(screenGeometry);
143 changedScreens.push_back(i);
144 }
145 } else {
146 // a new screen, create a widget and connect the signals.
147 screenWidget = new QDesktopScreenWidget(qScreen, screenGeometry);
148 QObject::connect(qScreen, SIGNAL(geometryChanged(QRect)),
149 q, SLOT(_q_updateScreens()), Qt::QueuedConnection);
150 QObject::connect(qScreen, SIGNAL(availableGeometryChanged(QRect)),
151 q, SLOT(_q_availableGeometryChanged()), Qt::QueuedConnection);
152 QObject::connect(qScreen, SIGNAL(destroyed()),
153 q, SLOT(_q_updateScreens()), Qt::QueuedConnection);
154 screenCountChanged = true;
155 }
156 // record all the screens and the overall geometry.
157 newScreens.push_back(screenWidget);
158 virtualGeometry += screenGeometry;
159 }
160
161 // Now we apply the accumulated updates.
162 screens.swap(newScreens); // now [newScreens] is the old screen list
163 Q_ASSERT(screens.size() == targetLength);
164 q->setGeometry(virtualGeometry.boundingRect());
165
166 // Delete the QDesktopScreenWidget that are not used any more.
167 foreach (QDesktopScreenWidget *screen, newScreens) {
168 if (!screens.contains(screen)) {
169 delete screen;
170 screenCountChanged = true;
171 }
172 }
173
174 // Finally, emit the signals.
175 if (screenCountChanged) {
176 // Notice that we trigger screenCountChanged even if a screen was removed and another one added,
177 // in which case the total number of screens did not change. This is the only way for applications
178 // to notice that a screen was swapped out against another one.
179 #if QT_DEPRECATED_SINCE(5, 11)
180 QT_WARNING_PUSH
181 QT_WARNING_DISABLE_DEPRECATED
182 emit q->screenCountChanged(targetLength);
183 QT_WARNING_POP
184 #endif
185 }
186 #if QT_DEPRECATED_SINCE(5, 11)
187 foreach (int changedScreen, changedScreens)
188 QT_WARNING_PUSH
189 QT_WARNING_DISABLE_DEPRECATED
190 emit q->resized(changedScreen);
191 QT_WARNING_POP
192 #endif
193 }
194
_q_availableGeometryChanged()195 void QDesktopWidgetPrivate::_q_availableGeometryChanged()
196 {
197 #if QT_DEPRECATED_SINCE(5, 11)
198 Q_Q(QDesktopWidget);
199 if (QScreen *screen = qobject_cast<QScreen *>(q->sender()))
200 QT_WARNING_PUSH
201 QT_WARNING_DISABLE_DEPRECATED
202 emit q->workAreaResized(QGuiApplication::screens().indexOf(screen));
203 QT_WARNING_POP
204 #endif
205 }
206
QDesktopWidget()207 QDesktopWidget::QDesktopWidget()
208 : QWidget(*new QDesktopWidgetPrivate, nullptr, Qt::Desktop)
209 {
210 Q_D(QDesktopWidget);
211 setObjectName(QLatin1String("desktop"));
212 d->_q_updateScreens();
213 connect(qApp, SIGNAL(screenAdded(QScreen*)), this, SLOT(_q_updateScreens()));
214 #if QT_DEPRECATED_SINCE(5, 11)
215 connect(qApp, SIGNAL(primaryScreenChanged(QScreen*)), this, SIGNAL(primaryScreenChanged()));
216 #endif
217 }
218
~QDesktopWidget()219 QDesktopWidget::~QDesktopWidget()
220 {
221 }
222
223 #if QT_DEPRECATED_SINCE(5, 11)
isVirtualDesktop() const224 bool QDesktopWidget::isVirtualDesktop() const
225 {
226 return QDesktopWidgetPrivate::isVirtualDesktop();
227 }
228 #endif
229
isVirtualDesktop()230 bool QDesktopWidgetPrivate::isVirtualDesktop()
231 {
232 return QGuiApplication::primaryScreen()->virtualSiblings().size() > 1;
233 }
234
geometry()235 QRect QDesktopWidgetPrivate::geometry()
236 {
237 return QGuiApplication::primaryScreen()->virtualGeometry();
238 }
239
size()240 QSize QDesktopWidgetPrivate::size()
241 {
242 return geometry().size();
243 }
244
width()245 int QDesktopWidgetPrivate::width()
246 {
247 return geometry().width();
248 }
249
height()250 int QDesktopWidgetPrivate::height()
251 {
252 return geometry().height();
253 }
254
255 #if QT_DEPRECATED_SINCE(5, 11)
primaryScreen() const256 int QDesktopWidget::primaryScreen() const
257 {
258 return QDesktopWidgetPrivate::primaryScreen();
259 }
260 #endif
261
primaryScreen()262 int QDesktopWidgetPrivate::primaryScreen()
263 {
264 return 0;
265 }
266
numScreens()267 int QDesktopWidgetPrivate::numScreens()
268 {
269 return qMax(QGuiApplication::screens().size(), 1);
270 }
271
272 #if QT_DEPRECATED_SINCE(5, 11)
numScreens() const273 int QDesktopWidget::numScreens() const
274 {
275 return QDesktopWidgetPrivate::numScreens();
276 }
277
screen(int screen)278 QWidget *QDesktopWidget::screen(int screen)
279 {
280 Q_D(QDesktopWidget);
281 if (screen < 0 || screen >= d->screens.length())
282 return d->screens.at(0);
283 return d->screens.at(screen);
284 }
285
availableGeometry(int screenNo) const286 const QRect QDesktopWidget::availableGeometry(int screenNo) const
287 {
288 return QDesktopWidgetPrivate::availableGeometry(screenNo);
289 }
290 #endif
291
availableGeometry(int screenNo)292 const QRect QDesktopWidgetPrivate::availableGeometry(int screenNo)
293 {
294 const QScreen *screen = QDesktopWidgetPrivate::screen(screenNo);
295 return screen ? screen->availableGeometry() : QRect();
296 }
297
298 #if QT_DEPRECATED_SINCE(5, 11)
screenGeometry(int screenNo) const299 const QRect QDesktopWidget::screenGeometry(int screenNo) const
300 {
301 return QDesktopWidgetPrivate::screenGeometry(screenNo);
302 }
303 #endif
304
screenGeometry(int screenNo)305 const QRect QDesktopWidgetPrivate::screenGeometry(int screenNo)
306 {
307 const QScreen *screen = QDesktopWidgetPrivate::screen(screenNo);
308 return screen ? screen->geometry() : QRect();
309 }
310
screenNumber(const QWidget * w) const311 int QDesktopWidget::screenNumber(const QWidget *w) const
312 {
313 return QDesktopWidgetPrivate::screenNumber(w);
314 }
315
screenNumber(const QWidget * w)316 int QDesktopWidgetPrivate::screenNumber(const QWidget *w)
317 {
318 if (!w)
319 return primaryScreen();
320
321 const QList<QScreen *> allScreens = QGuiApplication::screens();
322 QList<QScreen *> screens = allScreens;
323 if (screens.isEmpty()) // This should never happen
324 return primaryScreen();
325
326 // If there is more than one virtual desktop
327 if (screens.count() != screens.constFirst()->virtualSiblings().count()) {
328 // Find the root widget, get a QScreen from it and use the
329 // virtual siblings for checking the window position.
330 if (const QScreen *winScreen = qt_widget_private(const_cast<QWidget *>(w))->associatedScreen())
331 screens = winScreen->virtualSiblings();
332 }
333
334 // Get the screen number from window position using screen geometry
335 // and proper screens.
336 QRect frame = w->frameGeometry();
337 if (!w->isWindow())
338 frame.moveTopLeft(w->mapToGlobal(QPoint(0, 0)));
339
340 QScreen *widgetScreen = nullptr;
341 int largestArea = 0;
342 foreach (QScreen *screen, screens) {
343 const QRect deviceIndependentScreenGeometry =
344 QHighDpi::fromNativePixels(screen->handle()->geometry(), screen);
345 const QRect intersected = deviceIndependentScreenGeometry.intersected(frame);
346 int area = intersected.width() * intersected.height();
347 if (largestArea < area) {
348 widgetScreen = screen;
349 largestArea = area;
350 }
351 }
352 return allScreens.indexOf(widgetScreen);
353 }
354
355 #if QT_DEPRECATED_SINCE(5, 11)
screenNumber(const QPoint & p) const356 int QDesktopWidget::screenNumber(const QPoint &p) const
357 {
358 return QDesktopWidgetPrivate::screenNumber(p);
359 }
360 #endif
361
screenNumber(const QPoint & p)362 int QDesktopWidgetPrivate::screenNumber(const QPoint &p)
363 {
364 QScreen *screen = QGuiApplication::screenAt(p);
365 return screen ? QGuiApplication::screens().indexOf(screen) : primaryScreen();
366 }
367
screen(int screenNo)368 QScreen *QDesktopWidgetPrivate::screen(int screenNo)
369 {
370 QList<QScreen *> screens = QGuiApplication::screens();
371 if (screenNo == -1)
372 screenNo = 0;
373 if (screenNo < 0 || screenNo >= screens.size())
374 return nullptr;
375 return screens.at(screenNo);
376 }
377
resizeEvent(QResizeEvent *)378 void QDesktopWidget::resizeEvent(QResizeEvent *)
379 {
380 }
381
382 QT_END_NAMESPACE
383
384 #include "moc_qdesktopwidget.cpp"
385 #include "moc_qdesktopwidget_p.cpp"
386