1 files changed, 143 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_gui_kernel_qapplication.cpp b/doc/src/snippets/code/src_gui_kernel_qapplication.cpp
new file mode 100644
index 0000000..bfb09e3
--- /dev/null
+++ b/doc/src/snippets/code/src_gui_kernel_qapplication.cpp
@@ -0,0 +1,143 @@
+//! [0]
+int main(int argc, char **argv)
+{
+#ifdef Q_WS_X11
+    bool useGUI = getenv("DISPLAY") != 0;
+#else
+    bool useGUI = true;
+#endif
+    QApplication app(argc, argv, useGUI);
+
+    if (useGUI) {
+       // start GUI version
+       ...
+    } else {
+       // start non-GUI version
+       ...
+    }
+    return app.exec();
+}
+//! [0]
+
+
+//! [1]
+QApplication::setStyle(new QWindowsStyle);
+//! [1]
+
+
+//! [2]
+int main(int argc, char *argv[])
+{
+    QApplication::setColorSpec(QApplication::ManyColor);
+    QApplication app(argc, argv);
+    ...
+    return app.exec();
+}
+//! [2]
+
+
+//! [3]
+QSize MyWidget::sizeHint() const
+{
+    return QSize(80, 25).expandedTo(QApplication::globalStrut());
+}
+//! [3]
+
+
+//! [4]
+void showAllHiddenTopLevelWidgets()
+{
+    foreach (QWidget *widget, QApplication::topLevelWidgets()) {
+        if (widget->isHidden())
+            widget->show();
+    }
+}
+//! [4]
+
+
+//! [5]
+void updateAllWidgets()
+{
+    foreach (QWidget *widget, QApplication::allWidgets())
+        widget->update();
+}
+//! [5]
+
+
+//! [6]
+int main(int argc, char *argv[])
+{
+    QApplication::setDesktopSettingsAware(false);
+    QApplication app(argc, argv);
+    ...
+    return app.exec();
+}
+//! [6]
+
+
+//! [7]
+if ((startPos - currentPos).manhattanLength() >=
+        QApplication::startDragDistance())
+    startTheDrag();
+//! [7]
+
+
+//! [8]
+void MyApplication::commitData(QSessionManager& manager)
+{
+    if (manager.allowsInteraction()) {
+        int ret = QMessageBox::warning(
+                    mainWindow,
+                    tr("My Application"),
+                    tr("Save changes to document?"),
+                    QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
+
+        switch (ret) {
+        case QMessageBox::Save:
+            manager.release();
+            if (!saveDocument())
+                manager.cancel();
+            break;
+        case QMessageBox::Discard:
+            break;
+        case QMessageBox::Cancel:
+        default:
+            manager.cancel();
+        }
+    } else {
+        // we did not get permission to interact, then
+        // do something reasonable instead
+    }
+}
+//! [8]
+
+
+//! [9]
+appname -session id
+//! [9]
+
+
+//! [10]
+foreach (QString command, mySession.restartCommand())
+    do_something(command);
+//! [10]
+
+
+//! [11]
+foreach (QString command, mySession.discardCommand())
+    do_something(command);
+//! [11]
+
+
+//! [12]
+QWidget *widget = qApp->widgetAt(x, y);
+if (widget)
+    widget = widget->window();
+//! [12]
+
+
+//! [13]
+QWidget *widget = qApp->widgetAt(point);
+if (widget)
+    widget = widget->window();
+//! [13]