source: branches/4.5.1/src/gui/kernel/qdesktopwidget_x11.cpp

Last change on this file was 2, checked in by Dmitry A. Kuminov, 17 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 10.6 KB
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1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the QtGui module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
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17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
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23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
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26** package.
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28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
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39**
40****************************************************************************/
41
42#include "qapplication.h"
43#include "qdesktopwidget.h"
44#include "qlibrary.h"
45#include "qt_x11_p.h"
46#include "qvariant.h"
47#include "qwidget_p.h"
48#include "qx11info_x11.h"
49#include <limits.h>
50
51QT_BEGIN_NAMESPACE
52
53// defined in qwidget_x11.cpp
54extern int qt_x11_create_desktop_on_screen;
55
56
57// function to update the workarea of the screen
58static bool qt_desktopwidget_workarea_dirty = true;
59void qt_desktopwidget_update_workarea()
60{
61 qt_desktopwidget_workarea_dirty = true;
62}
63
64
65class QSingleDesktopWidget : public QWidget
66{
67public:
68 QSingleDesktopWidget();
69 ~QSingleDesktopWidget();
70};
71
72QSingleDesktopWidget::QSingleDesktopWidget()
73 : QWidget(0, Qt::Desktop)
74{
75}
76
77QSingleDesktopWidget::~QSingleDesktopWidget()
78{
79 const QObjectList &childList = children();
80 for (int i = childList.size(); i > 0 ;) {
81 --i;
82 childList.at(i)->setParent(0);
83 }
84}
85
86
87class QDesktopWidgetPrivate : public QWidgetPrivate
88{
89public:
90 QDesktopWidgetPrivate();
91 ~QDesktopWidgetPrivate();
92
93 void init();
94
95 bool use_xinerama;
96 int defaultScreen;
97 int screenCount;
98
99 QWidget **screens;
100 QRect *rects;
101 QRect *workareas;
102};
103
104QDesktopWidgetPrivate::QDesktopWidgetPrivate()
105 : use_xinerama(false), defaultScreen(0), screenCount(1),
106 screens(0), rects(0), workareas(0)
107{
108}
109
110QDesktopWidgetPrivate::~QDesktopWidgetPrivate()
111{
112 if (screens) {
113 for (int i = 0; i < screenCount; ++i) {
114 if (i == defaultScreen) continue;
115 delete screens[i];
116 screens[i] = 0;
117 }
118
119 free (screens);
120 }
121
122 if (rects) delete [] rects;
123 if (workareas) delete [] workareas;
124}
125
126void QDesktopWidgetPrivate::init()
127{
128 // get the screen count
129 int newScreenCount = ScreenCount(X11->display);
130#ifndef QT_NO_XINERAMA
131
132 XineramaScreenInfo *xinerama_screeninfo = 0;
133
134 // we ignore the Xinerama extension when using the display is
135 // using traditional multi-screen (with multiple root windows)
136 if (newScreenCount == 1
137 && X11->ptrXineramaQueryExtension
138 && X11->ptrXineramaIsActive
139 && X11->ptrXineramaQueryScreens) {
140 int unused;
141 use_xinerama = (X11->ptrXineramaQueryExtension(X11->display, &unused, &unused)
142 && X11->ptrXineramaIsActive(X11->display));
143 }
144
145 if (use_xinerama) {
146 xinerama_screeninfo =
147 X11->ptrXineramaQueryScreens(X11->display, &newScreenCount);
148 }
149
150 if (xinerama_screeninfo) {
151 defaultScreen = 0;
152 } else
153#endif // QT_NO_XINERAMA
154 {
155 defaultScreen = DefaultScreen(X11->display);
156 newScreenCount = ScreenCount(X11->display);
157 use_xinerama = false;
158 }
159
160 delete [] rects;
161 rects = new QRect[newScreenCount];
162 delete [] workareas;
163 workareas = new QRect[newScreenCount];
164
165 // get the geometry of each screen
166 int i, j, x, y, w, h;
167 for (i = 0, j = 0; i < newScreenCount; i++, j++) {
168
169#ifndef QT_NO_XINERAMA
170 if (use_xinerama) {
171 x = xinerama_screeninfo[i].x_org;
172 y = xinerama_screeninfo[i].y_org;
173 w = xinerama_screeninfo[i].width;
174 h = xinerama_screeninfo[i].height;
175 } else
176#endif // QT_NO_XINERAMA
177 {
178 x = 0;
179 y = 0;
180 w = WidthOfScreen(ScreenOfDisplay(X11->display, i));
181 h = HeightOfScreen(ScreenOfDisplay(X11->display, i));
182 }
183
184 rects[j].setRect(x, y, w, h);
185
186 if (use_xinerama && j > 0 && rects[j-1].intersects(rects[j])) {
187 // merge a "cloned" screen with the previous, hiding all crtcs
188 // that are currently showing a sub-rect of the previous screen
189 if ((rects[j].width()*rects[j].height()) >
190 (rects[j-1].width()*rects[j-1].height()))
191 rects[j-1] = rects[j];
192 j--;
193 }
194
195 workareas[i] = QRect();
196 }
197
198 if (screens) {
199 // leaks QWidget* pointers on purpose, can't delete them as pointer escapes
200 screens = (QWidget**) realloc(screens, j * sizeof(QWidget*));
201 if (j > screenCount)
202 memset(&screens[screenCount], 0, (j-screenCount) * sizeof(QWidget*));
203 }
204
205 screenCount = j;
206
207#ifndef QT_NO_XINERAMA
208 if (use_xinerama && screenCount == 1)
209 use_xinerama = false;
210
211 if (xinerama_screeninfo)
212 XFree(xinerama_screeninfo);
213#endif // QT_NO_XINERAMA
214
215}
216
217// the QDesktopWidget itself will be created on the default screen
218// as qt_x11_create_desktop_on_screen defaults to -1
219QDesktopWidget::QDesktopWidget()
220 : QWidget(*new QDesktopWidgetPrivate, 0, Qt::Desktop)
221{
222 Q_D(QDesktopWidget);
223 d->init();
224}
225
226QDesktopWidget::~QDesktopWidget()
227{
228}
229
230bool QDesktopWidget::isVirtualDesktop() const
231{
232 Q_D(const QDesktopWidget);
233 return d->use_xinerama;
234}
235
236int QDesktopWidget::primaryScreen() const
237{
238 Q_D(const QDesktopWidget);
239 return d->defaultScreen;
240}
241
242int QDesktopWidget::numScreens() const
243{
244 Q_D(const QDesktopWidget);
245 return d->screenCount;
246}
247
248QWidget *QDesktopWidget::screen(int screen)
249{
250 Q_D(QDesktopWidget);
251 if (d->use_xinerama)
252 return this;
253
254 if (screen < 0 || screen >= d->screenCount)
255 screen = d->defaultScreen;
256
257 if (! d->screens) {
258 d->screens = (QWidget**) calloc( d->screenCount, sizeof(QWidget*));
259 d->screens[d->defaultScreen] = this;
260 }
261
262 if (! d->screens[screen] || // not created yet
263 ! (d->screens[screen]->windowType() == Qt::Desktop)) { // reparented away
264 qt_x11_create_desktop_on_screen = screen;
265 d->screens[screen] = new QSingleDesktopWidget;
266 qt_x11_create_desktop_on_screen = -1;
267 }
268
269 return d->screens[screen];
270}
271
272const QRect QDesktopWidget::availableGeometry(int screen) const
273{
274 Q_D(const QDesktopWidget);
275 if (qt_desktopwidget_workarea_dirty) {
276 // the workareas are dirty, invalidate them
277 for (int i = 0; i < d->screenCount; ++i)
278 d->workareas[i] = QRect();
279 qt_desktopwidget_workarea_dirty = false;
280 }
281
282 if (screen < 0 || screen >= d->screenCount)
283 screen = d->defaultScreen;
284
285 if (d->workareas[screen].isValid())
286 return d->workareas[screen];
287
288 if ((d->screenCount == 1 || !isVirtualDesktop())
289 && X11->isSupportedByWM(ATOM(_NET_WORKAREA))) {
290 Atom ret;
291 int format, e;
292 unsigned char *data = 0;
293 unsigned long nitems, after;
294
295 e = XGetWindowProperty(X11->display,
296 QX11Info::appRootWindow(screen),
297 ATOM(_NET_WORKAREA), 0, 4, False, XA_CARDINAL,
298 &ret, &format, &nitems, &after, &data);
299
300 if (e == Success && ret == XA_CARDINAL &&
301 format == 32 && nitems == 4) {
302 long *workarea = (long *) data;
303 d->workareas[screen].setRect(workarea[0], workarea[1],
304 workarea[2], workarea[3]);
305 } else {
306 d->workareas[screen] = screenGeometry(screen);
307 }
308 if (data)
309 XFree(data);
310 } else {
311 d->workareas[screen] = screenGeometry(screen);
312 }
313
314 return d->workareas[screen];
315}
316
317const QRect QDesktopWidget::screenGeometry(int screen) const
318{
319 Q_D(const QDesktopWidget);
320 if (screen < 0 || screen >= d->screenCount)
321 screen = d->defaultScreen;
322
323 return d->rects[screen];
324}
325
326int QDesktopWidget::screenNumber(const QWidget *widget) const
327{
328 Q_D(const QDesktopWidget);
329 if (!widget)
330 return d->defaultScreen;
331
332#ifndef QT_NO_XINERAMA
333 if (d->use_xinerama) {
334 // this is how we do it for xinerama
335 QRect frame = widget->frameGeometry();
336 if (!widget->isWindow())
337 frame.moveTopLeft(widget->mapToGlobal(QPoint(0, 0)));
338
339 int maxSize = -1;
340 int maxScreen = -1;
341
342 for (int i = 0; i < d->screenCount; ++i) {
343 QRect sect = d->rects[i].intersected(frame);
344 int size = sect.width() * sect.height();
345 if (size > maxSize && sect.width() > 0 && sect.height() > 0) {
346 maxSize = size;
347 maxScreen = i;
348 }
349 }
350 return maxScreen;
351 }
352#endif // QT_NO_XINERAMA
353
354 return widget->x11Info().screen();
355}
356
357int QDesktopWidget::screenNumber(const QPoint &point) const
358{
359 Q_D(const QDesktopWidget);
360 int closestScreen = -1;
361 int shortestDistance = INT_MAX;
362 for (int i = 0; i < d->screenCount; ++i) {
363 int thisDistance = d->pointToRect(point, d->rects[i]);
364 if (thisDistance < shortestDistance) {
365 shortestDistance = thisDistance;
366 closestScreen = i;
367 }
368 }
369 return closestScreen;
370}
371
372void QDesktopWidget::resizeEvent(QResizeEvent *event)
373{
374 Q_D(QDesktopWidget);
375 d->init();
376 qt_desktopwidget_workarea_dirty = true;
377 QWidget::resizeEvent(event);
378}
379
380QT_END_NAMESPACE
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