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//! [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]
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