Qt Reference Documentation

fullscreenexitbutton.h Example File

maemo5/windowstates/fullscreenexitbutton.h
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 #ifndef FULLSCREENEXITBUTTON_H
 #define FULLSCREENEXITBUTTON_H

 #include <QtGui/qtoolbutton.h>
 #include <QtGui/qevent.h>

 class FullScreenExitButton : public QToolButton
 {
     Q_OBJECT
 public:
     inline explicit FullScreenExitButton(QWidget *parent);

 protected:
     inline bool eventFilter(QObject *obj, QEvent *ev);
 };

 FullScreenExitButton::FullScreenExitButton(QWidget *parent)
         : QToolButton(parent)
 {
     Q_ASSERT(parent);

     // set the fullsize icon from Maemo's theme
     setIcon(QIcon::fromTheme(QLatin1String("general_fullsize")));

     // ensure that our size is fixed to our ideal size
     setFixedSize(sizeHint());

     // set the background to 0.5 alpha
     QPalette pal = palette();
     QColor backgroundColor = pal.color(backgroundRole());
     backgroundColor.setAlpha(128);
     pal.setColor(backgroundRole(), backgroundColor);
     setPalette(pal);

     // ensure that we're painting our background
     setAutoFillBackground(true);

     // when we're clicked, tell the parent to exit fullscreen
     connect(this, SIGNAL(clicked()), parent, SLOT(showNormal()));

     // install an event filter to listen for the parent's events
     parent->installEventFilter(this);
 }

 bool FullScreenExitButton::eventFilter(QObject *obj, QEvent *ev)
 {
     if (obj != parent())
         return QToolButton::eventFilter(obj, ev);

     QWidget *parent = parentWidget();
     bool isFullScreen = parent->windowState() & Qt::WindowFullScreen;

     switch (ev->type()) {
     case QEvent::WindowStateChange:
         setVisible(isFullScreen);
         if (isFullScreen)
             raise();
         // fall through
     case QEvent::Resize:
         if (isVisible())
             move(parent->width() - width(),
                  parent->height() - height());
         break;
     default:
         break;
     }

     return QToolButton::eventFilter(obj, ev);
 }

 #endif
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