Qt Reference Documentation

examplewidget.h Example File

maemo5/windowstates/examplewidget.h
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 #ifndef EXAMPLEWIDGET_H
 #define EXAMPLEWIDGET_H

 #include "fullscreenexitbutton.h"

 #include <QtGui>
 #include <QX11Info>
 #include <QtDBus>

 // ![4]
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 // ![4]

 class ExampleWidget : public QWidget
 {
     Q_OBJECT

 public:
     ExampleWidget()
     {
         QPushButton *fsButton = new QPushButton("Toggle Fullscreen");
         connect(fsButton, SIGNAL(clicked()), SLOT(toggleFullScreen()));

         QCheckBox *busyCheckBox = new QCheckBox("Busy Indicator");
         connect(busyCheckBox, SIGNAL(stateChanged(int)), SLOT(toggleBusy(int)));

         QCheckBox *disturbCheckBox = new QCheckBox("Do Not Disturb");
         connect(disturbCheckBox, SIGNAL(stateChanged(int)), SLOT(toggleDisturb(int)));

         QPushButton *showExpose = new QPushButton("Show Expose");
         connect(showExpose, SIGNAL(clicked()), SLOT(showExpose()));

         QTextBrowser *browser = new QTextBrowser;
         browser->setText("Just some dummy example text.");

 // ![3]
         new FullScreenExitButton(this);
 // ![3]

         QVBoxLayout *layout = new QVBoxLayout(this);
         layout->addWidget(fsButton);
         layout->addWidget(busyCheckBox);
         layout->addWidget(disturbCheckBox);
         layout->addWidget(showExpose);
         layout->addWidget(browser);

         defaultMargins = layout->contentsMargins();
     }

 public Q_SLOTS:
 // ![0]
     void toggleFullScreen()
     {
         bool isFullScreen = windowState() & Qt::WindowFullScreen;
         if (isFullScreen)
             showNormal();
         else
             showFullScreen();
     }
 // ![0]

 // ![1]
     void toggleBusy(int checkState)
     {
         setAttribute(Qt::WA_Maemo5ShowProgressIndicator, checkState == Qt::Checked);
     }
 // ![1]

 // ![5]
     void toggleDisturb(int checkState)
     {
         Atom atom = XInternAtom(QX11Info::display(), "_HILDON_DO_NOT_DISTURB", False);
         if (!atom) {
             qWarning("Unable to obtain _HILDON_DO_NOT_DISTURB. This example will only work "
                      "on a Maemo 5 device!");
             return;
         }

         if (checkState == Qt::Checked) {
             long state = 1;
             XChangeProperty(
                     QX11Info::display(),
                     winId(),
                     atom,
                     XA_INTEGER,
                     32,
                     PropModeReplace,
                     (unsigned char *) &state,
                     1);
         } else {
             XDeleteProperty(QX11Info::display(), winId(), atom);
         }
     }
 // ![5]

 // ![2]
     void showExpose()
     {
         QDBusConnection c = QDBusConnection::sessionBus();
         QDBusMessage m = QDBusMessage::createSignal("/", "com.nokia.hildon_desktop", "exit_app_view");
         c.send(m);
     }
 // ![2]

 protected:
     void changeEvent(QEvent *event)
     {
         if (event->type() == QEvent::WindowStateChange) {

             // set the content margins to 0 in full screen mode,
             // so our fullScreenButton will be nicely visible
             const bool isFullScreen = windowState() & Qt::WindowFullScreen;
             if (isFullScreen)
                 layout()->setContentsMargins(0, 0, 0, 0);
             else
                 layout()->setContentsMargins(defaultMargins);
         }

         QWidget::changeEvent(event);
     }

 private:
     QMargins defaultMargins;
 };

 #endif
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