![Window System Qt Application
IPC #include<QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc,argv);
QWidget w;
w.show();
return a.exec();
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-14-320.jpg)
![Window System Paint Painting Code
#include<QtGui>
int main(int argc, char
*argv[])
{
QApplication a
(argc,argv);
QWidget w;
w.show();
return a.exec();
}
Update](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-22-320.jpg)
![Window System Backing Store Painting Code
#include<QtGui>
int main(int argc, char
*argv[])
{
QApplication a
(argc,argv);
QWidget w;
w.show();
return a.exec();
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-23-320.jpg)
![int QEventDispatcherUNIXPrivate::doSelect(
QEventLoop::ProcessEventsFlags flags, timeval *timeout)
{
...
// Process timers and socket notifiers - the common UNIX stuff
...
nsel = q->select(highest + 1,
&sn_vec[0].select_fds,
&sn_vec[1].select_fds,
&sn_vec[2].select_fds,
timeout);
...
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-38-320.jpg)
![postEvent() Qt Event Queue Event Loop Event Handler
#include<Q bool
tGui> W::event
int main(int (QEvent *e)
argc, char {
*argv[]) if (e-
{ >type() ==](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-43-320.jpg)
![sendEvent() Event Handler
#include<Q bool
tGui> W::event
int main(int (QEvent *e)
argc, char {
*argv[]) if (e-
{ >type() ==](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-44-320.jpg)
![#include <QtGui>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QPixmap skin("transparency.png");
QLabel widget;
widget.setPixmap(skin);
widget.setWindowFlags(Qt::Window
|Qt::CustomizeWindowHint
|Qt::FramelessWindowHint);
widget.setAttribute(Qt::WA_TranslucentBackground);
widget.resize(skin.size());
widget.show();
return app.exec();
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-81-320.jpg)
![Server Client
#include<QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc,argv);
QWidget w;
w.show();
return a.exec();
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-97-320.jpg)
![Server Protocol Client
?
#include<QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc,argv);
QWidget w;
w.show();
return a.exec();
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-98-320.jpg)
![Request #include<QtGui>
int main(int argc, char
*argv[])
{
QApplication a
(argc,argv);
QWidget w;
w.show();
return a.exec();
}
Response #include<QtGui>
int main(int argc, char
*argv[])
{
QApplication a
(argc,argv);
QWidget w;
w.show();
return a.exec();
}](https://image.slidesharecdn.com/dd09qwidgetindepth-091201080049-phpapp02/85/Qt-Widget-In-Depth-100-320.jpg)
Qt Widget In-Depth
- 1. Qt Widgets In-Depth QWidget Under The Surface
- 2. About Me • Marius Bugge Monsen • Qt Developer • Qt Widgets Team Lead
- 3. • Widgets and Window Systems • Flags and Attributes • The Future of Qt Widgets
- 4. by extranoise on flickr Widgets and Window Systems
- 5. • Widgets and Window Systems • Window Systems • Windows and Widgets • Updates and Painting • Events and Loops
- 6. • Widgets and Window Systems • Window Systems • Windows and Widgets • Updates and Painting • Events and Loops
- 7. QWS SunView MiniGUI Metisse Rio Microwindows DM Fresco/Berlin 8 1/2 GEM ManaGeR HP Windows OOHG Xynth MicroXwin Intuition Y FBUI NeWS NeXT DPS Quartz Wayland Twin OPIE X
- 8. • X11 • Desktop Window Manager (MS Windows) • Quartz Compositor (Mac OS X) • QWS • S60 Window Manager
- 10. Surface Surface
- 11. Screen
- 12. Window System
- 13. Window System
- 14. Window System Qt Application IPC #include<QtGui> int main(int argc, char *argv[]) { QApplication a(argc,argv); QWidget w; w.show(); return a.exec(); }
- 15. • Widgets and Window Systems • Window Systems • Windows and Widgets • Updates and Painting • Events and Loops
- 16. Surface Surface Surface
- 17. Surface Surface Surface
- 19. Widget Window Widget
- 20. Window
- 21. • Widgets and Window Systems • Window Systems • Windows and Widgets • Updates and Painting • Events and Loops
- 22. Window System Paint Painting Code #include<QtGui> int main(int argc, char *argv[]) { QApplication a (argc,argv); QWidget w; w.show(); return a.exec(); } Update
- 23. Window System Backing Store Painting Code #include<QtGui> int main(int argc, char *argv[]) { QApplication a (argc,argv); QWidget w; w.show(); return a.exec(); }
- 24. Text Text
- 25. Text Text
- 26. • Client Side • Top-Level Window • Backing Store • Pixmap
- 27. • Server Side • Window • Pixmap
- 28. • Client Side • Server Side • Window • Window • Backing Store • Pixmap • Pixmap
- 29. void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QPoint &offset, int flags, QPainter *sharedPainter, QWidgetBackingStore *backingStore) { ... //actually send the paint event QPaintEvent e(toBePainted); QCoreApplication::sendSpontaneousEvent(q, &e); ... }
- 30. • Widgets and Window Systems • Window Systems • Windows and Widgets • Updates and Painting • Events and Loops
- 31. • Spontaneous Events • Application Events
- 32. Input Event bool W::event(QEvent *e) { Any if (e->type() == t) foobar(); return false; }
- 33. Window System Socket Qt Event Dispatcher Event Handler bool W::event (QEvent *e) { if (e- >type() == Qt Event Loop
- 34. int QCoreApplication::exec() { ... QEventLoop eventLoop; self->d_func()->in_exec = true; self->d_func()->aboutToQuitEmitted = false; int returnCode = eventLoop.exec(); ... }
- 35. int QEventLoop::exec(ProcessEventsFlags flags) { ... try { while (!d->exit) processEvents(flags | WaitForMoreEvents | EventLoopExec); } catch (...) { ... --d->threadData->loopLevel; return d->returnCode; }
- 36. bool QEventLoop::processEvents(ProcessEventsFlags flags) { Q_D(QEventLoop); if (!d->threadData->eventDispatcher) return false; if (flags & DeferredDeletion) QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete); return d->threadData->eventDispatcher->processEvents(flags); }
- 37. bool QEventDispatcherUNIX::processEvents (QEventLoop::ProcessEventsFlags flags) { ... // we are awake, broadcast it emit awake(); QCoreApplicationPrivate::sendPostedEvents(0, 0, d->threadData); ... nevents = d->doSelect(flags, tm); ... }
- 38. int QEventDispatcherUNIXPrivate::doSelect( QEventLoop::ProcessEventsFlags flags, timeval *timeout) { ... // Process timers and socket notifiers - the common UNIX stuff ... nsel = q->select(highest + 1, &sn_vec[0].select_fds, &sn_vec[1].select_fds, &sn_vec[2].select_fds, timeout); ... }
- 39. int QEventDispatcherUNIX::select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, timeval *timeout) { return qt_safe_select(nfds, readfds, writefds, exceptfds, timeout); }
- 40. int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept, const struct timeval *orig_timeout) { ... // loop and recalculate the timeout as needed int ret; forever { ret = ::select(nfds, fdread, fdwrite, fdexcept, &timeout); if (ret != -1 || errno != EINTR) return ret; // recalculate the timeout ... } }
- 41. • select() • poll status of file descriptors • blocks until timeout
- 42. X11 Socket XLib Queue Qt Event Dispatcher Event Handler bool W::event (QEvent *e) { if (e- >type() == Qt Event Loop
- 43. postEvent() Qt Event Queue Event Loop Event Handler #include<Q bool tGui> W::event int main(int (QEvent *e) argc, char { *argv[]) if (e- { >type() ==
- 44. sendEvent() Event Handler #include<Q bool tGui> W::event int main(int (QEvent *e) argc, char { *argv[]) if (e- { >type() ==
- 46. D A C B
- 47. D C A B
- 48. D C A B
- 49. D C A B
- 50. D C A B
- 51. bool QApplication::notify(QObject *receiver, QEvent *e) { ... bool res = false; if (!receiver->isWidgetType()) { res = d->notify_helper(receiver, e); } else switch (e->type()) { ... }
- 52. • Widgets Propagate Events
- 53. ... case QEvent::StatusTip: case QEvent::WhatsThisClicked: { QWidget *w = static_cast<QWidget *>(receiver); while (w) { res = d->notify_helper(w, e); if ((res && e->isAccepted()) || w->isWindow()) break; w = w->parentWidget(); } } break; ...
- 54. • Input Events Are Propagated
- 55. • Input Events are propagated if • event->isAccepted() == false • receiver->event(e) == false
- 56. bool QCoreApplicationPrivate::notify_helper(QObject *receiver, QEvent * event) { // send to all application event filters if (sendThroughApplicationEventFilters(receiver, event)) return true; // send to all receiver event filters if (sendThroughObjectEventFilters(receiver, event)) return true; // deliver the event return receiver->event(event); }
- 57. by Dan Queiroz on flickr Flags and Attributes
- 58. • Flags and Attributes • Window Types • Window Hints • Widget States • Widget Attributes
- 59. • QWidget • QPaintDevice • QObject • QWindowSurface
- 60. • Flags and Attributes • Window Types • Window Hints • Widget States • Widget Attributes
- 61. • Window Types • Widget • Window
- 62. • Dialog • Sheet (Mac) • Drawer (Mac) • Popup • ToolTip • SplashScreen • Desktop • SubWindow (MDI)
- 64. • Flags and Attributes • Window Types • Window Hints • Widget States • Widget Attributes
- 65. • CustomizeWindowHint • MacWindowToolBarButtonHint • WindowTitleHint • BypassGraphicsProxyWidget • WindowSystemMenuHint • WindowShadeButtonHint • WindowMinimizeButtonHint • WindowStaysOnTopHint • WindowMaximizeButtonHint • WindowStaysOnBottomHint • WindowMinMaxButtonHint • WindowOkButtonHint (WinCE) • WindowCloseButtonHint • WindowCancelButtonHint (WinCE) • WindowContextHelpButtonHint
- 66. • Flags and Attributes • Window Types • Window Hints • Widget States • Widget Attributes
- 67. • WindowState • WindowNoState • WindowMinimized • WindowMaximized • WindowFullScreen • WindowActive
- 68. • Flags and Attributes • Window Types • Window Hints • Widget States • Widget Attributes
- 69. • Qt::Widget Attribute • 124 Attributes • setAttribute() • testAttribute()
- 71. by robclimbing on flickr Tips and Tricks
- 73. Exposed Static Contents Exposed
- 78. • QWidget::scroll() • QWidget::autoFillBackground • Qt::WA_OpaquePaintEvent
- 81. #include <QtGui> int main(int argc, char *argv[]) { QApplication app(argc, argv); QPixmap skin("transparency.png"); QLabel widget; widget.setPixmap(skin); widget.setWindowFlags(Qt::Window |Qt::CustomizeWindowHint |Qt::FramelessWindowHint); widget.setAttribute(Qt::WA_TranslucentBackground); widget.resize(skin.size()); widget.show(); return app.exec(); }
- 83. by jeff_c on flickr The Future of Qt Widgets
- 84. • The story of two APIs ...
- 85. • QWidget • Widget Hierarchy • QGraphicsItem • Scene Graph
- 86. • QWidget • Alien Widgets • Graphics Effects • Disable Clipping ? • Disable Move Events ? • Transformations ?
- 87. • Is it possible ?
- 88. • Is it possible in Qt 4.x ?
- 90. Bonus Material
- 91. Qt Developer Days Window System
- 92. Window Surface Scene Graph IPC
- 93. QSharedMemory QGraphicsScene QTcpSocket
- 95. • Server • Connections • Scene Graph
- 96. • Window • Surface • Geometry • Id
- 97. Server Client #include<QtGui> int main(int argc, char *argv[]) { QApplication a(argc,argv); QWidget w; w.show(); return a.exec(); }
- 98. Server Protocol Client ? #include<QtGui> int main(int argc, char *argv[]) { QApplication a(argc,argv); QWidget w; w.show(); return a.exec(); }
- 99. • Message • Request • Reply • Event
- 100. Request #include<QtGui> int main(int argc, char *argv[]) { QApplication a (argc,argv); QWidget w; w.show(); return a.exec(); } Response #include<QtGui> int main(int argc, char *argv[]) { QApplication a (argc,argv); QWidget w; w.show(); return a.exec(); }
- 101. Event bool W::event(QEvent *e) { if (e->type() == t) foobar(); return false; }
- 102. Lighthouse
- 103. • Research! • Qt Graphicssystem Interface • Makes Qt ports easy
- 104. • QGraphicsSystem • QGraphicsSystemScreen • QWindowSurface
- 105. • QGraphicsSystem • Window Surfaces • Server Communication
- 106. • QGraphicsSystemScreen • Screen Information • Depth • Resolution • Size
- 107. • QWindowSurface • Surface • Geometry • Id
- 108. Demo
- 109. Source Code • git://gitorious.org/+qt-developers/qt/lighthouse.git