The QApplication class manages the GUI application's control flow and main settings. More...

Inheritance diagram for QtGui.QApplication:

Collaboration diagram for QtGui.QApplication:

Public Types
enum	ColorSpec { CustomColor = 1, ManyColor = 2, NormalColor = 0 }
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enum	Type { GuiClient = 1, GuiServer = 2, Tty = 0 }

Public Types inherited from QtCore.QCoreApplication
enum	Encoding { CodecForTr = 0, DefaultCodec = 0, UnicodeUTF8 = 1 }
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Public Member Functions
override void	CreateProxy ()

virtual void	CommitData (QSessionManager sm)


override bool	OnEvent (QEvent arg1)


new bool	IsSessionRestored ()


override bool	Notify (QObject arg1, QEvent arg2)


virtual void	SaveState (QSessionManager sm)


new string	SessionId ()


new string	SessionKey ()


new void	WinFocus (QWidget arg1, bool arg2)

new void	Dispose ()

Public Member Functions inherited from QtCore.QCoreApplication
new bool	SetEventFilter (bool filter)


new void	Dispose ()

Public Member Functions inherited from QtCore.QObject
	QObject (QObject parent=null)


new bool	BlockSignals (bool b)


new System.Collections.Generic.List < QObject >	Children ()


new bool	Connect (QObject sender, string signal, string member, Qt.ConnectionType type=Qt.ConnectionType.AutoConnection)


new void	DeleteLater ()


new bool	Disconnect (QObject receiver, string member=null)


new bool	Disconnect (string signal=null, QObject receiver=null, string member=null)


new void	DumpObjectInfo ()


new void	DumpObjectTree ()


new System.Collections.Generic.List < QByteArray >	DynamicPropertyNames ()


virtual bool	EventFilter (QObject arg1, QEvent arg2)


new bool	Inherits (string classname)


new void	InstallEventFilter (QObject arg1)


new bool	IsWidgetType ()


new void	KillTimer (int id)


new object	Property (string name)


new void	RemoveEventFilter (QObject arg1)


new bool	SetProperty (string name, object value)


new void	SetUserData (uint id, QObjectUserData data)

new bool	SignalsBlocked ()


new int	StartTimer (int interval)


new QObjectUserData	UserData (uint id)

new void	Dispose ()

Public Member Functions inherited from QtCore.Qt
delegate QTextStream	FuncQTextStreamQTextStream (QTextStream qTextStream)

delegate string	FuncStringQByteArray (QByteArray qByteArray)

delegate QByteArray	FuncQByteArrayString (string @string)

delegate void	ActionQtMsgTypeString (QtMsgType qtMsgType, string @string)

delegate QObject	FuncQObject ()

Static Public Member Functions
static void	AboutQt ()


static QWidget	ActiveModalWidget ()


static QWidget	ActivePopupWidget ()


static void	Alert (QWidget widget, int duration=0)


static System.Collections.Generic.List < QWidget >	AllWidgets ()


static void	Beep ()


static void	ChangeOverrideCursor (QCursor arg1)


static QClipboard	Clipboard ()


static void	CloseAllWindows ()


static QDesktopWidget	Desktop ()


static QWidget	FocusWidget ()


static QFont	Font ()


static QFont	Font (QWidget arg1)


static QFont	Font (string className)


static QFontMetrics	FontMetrics ()


static bool	IsEffectEnabled (Qt.UIEffect arg1)


static bool	IsLeftToRight ()


static bool	IsRightToLeft ()


static Qt.LayoutDirection	KeyboardInputDirection ()


static QLocale	KeyboardInputLocale ()


static Qt.KeyboardModifier	KeyboardModifiers ()


static Qt.MouseButton	MouseButtons ()


static QPalette	Palette ()


static QPalette	Palette (QWidget arg1)


static QPalette	Palette (string className)


static Qt.KeyboardModifier	QueryKeyboardModifiers ()


static void	RestoreOverrideCursor ()


static void	SetEffectEnabled (Qt.UIEffect arg1, bool enable=true)


static void	SetFont (QFont arg1, string className=null)


static void	SetGraphicsSystem (string arg1)


static void	SetPalette (QPalette arg1, string className=null)


static QStyle	SetStyle (string arg1)


static void	SyncX ()


static QWidget	TopLevelAt (QPoint p)


static QWidget	TopLevelAt (int x, int y)


static System.Collections.Generic.List < QWidget >	TopLevelWidgets ()


static string	Tr (string s, string c=null)

static string	Tr (string s, string c, int n)

static string	TrUtf8 (string s, string c=null)

static string	TrUtf8 (string s, string c, int n)

static QApplication.Type	type ()


static QWidget	WidgetAt (QPoint p)


static QWidget	WidgetAt (int x, int y)


static void	WinMouseButtonUp ()

Static Public Member Functions inherited from QtCore.QCoreApplication
static void	AddLibraryPath (string arg1)


static string	ApplicationDirPath ()


static string	ApplicationFilePath ()


static long	ApplicationPid ()


static int	Argc ()

static System.Collections.Generic.List < string >	Arguments ()


static Pointer< sbyte >	Argv ()

static bool	ClosingDown ()


static void	Exit (int retcode=0)


static void	Flush ()


static bool	HasPendingEvents ()


static void	InstallTranslator (QTranslator messageFile)


static QCoreApplication	Instance ()


static void	PostEvent (QObject receiver, QEvent @event)


static void	PostEvent (QObject receiver, QEvent @event, int priority)


static void	ProcessEvents (QEventLoop.ProcessEventsFlag flags=QEventLoop.ProcessEventsFlag.AllEvents)


static void	ProcessEvents (QEventLoop.ProcessEventsFlag flags, int maxtime)


static void	Quit ()


static void	RemoveLibraryPath (string arg1)


static void	RemovePostedEvents (QObject receiver)


static void	RemovePostedEvents (QObject receiver, int eventType)


static void	RemoveTranslator (QTranslator messageFile)


static bool	SendEvent (QObject receiver, QEvent @event)


static void	SendPostedEvents ()


static void	SendPostedEvents (QObject receiver, int event_type)


static void	SetAttribute (Qt.ApplicationAttribute attribute, bool on=true)


static bool	StartingUp ()


static bool	TestAttribute (Qt.ApplicationAttribute attribute)


static string	Tr (string s, string c=null)

static string	Tr (string s, string c, int n)

static string	TrUtf8 (string s, string c=null)

static string	TrUtf8 (string s, string c, int n)

static string	Translate (string context, string key, string disambiguation=null, QCoreApplication.Encoding encoding=QCoreApplication.Encoding.CodecForTr)


static string	Translate (string context, string key, string disambiguation, QCoreApplication.Encoding encoding, int n)


Static Public Member Functions inherited from QtCore.QObject
static bool	Connect (QObject sender, QMetaMethod signal, QObject receiver, QMetaMethod method, Qt.ConnectionType type=Qt.ConnectionType.AutoConnection)


static bool	Connect (QObject sender, string signal, QObject receiver, string member, Qt.ConnectionType arg5=Qt.ConnectionType.AutoConnection)


static bool	Disconnect (QObject sender, QMetaMethod signal, QObject receiver, QMetaMethod member)


static bool	Disconnect (QObject sender, string signal, QObject receiver, string member)


static uint	RegisterUserData ()

static string	Tr (string s, string c=null)


static string	Tr (string s, string c, int n)


static string	TrUtf8 (string s, string c=null)


static string	TrUtf8 (string s, string c, int n)


Static Public Member Functions inherited from QtCore.Qt
static QDataStream	Write (QDataStream s, object p)

static QDataStream	Write (QDataStream arg1, QSizeF arg2)

static QTextStream	Write (QTextStream s, Qt.FuncQTextStreamQTextStream f)

static QDataStream	Write (QDataStream arg1, QPoint arg2)

static QDataStream	Write (QDataStream arg1, QLineF arg2)

static QDataStream	Write (QDataStream arg1, QPointF arg2)

static QDataStream	Write (QDataStream arg1, QChar arg2)

static QDataStream	Write (QDataStream arg1, QByteArray arg2)

static QDataStream	Write (QDataStream arg1, QEasingCurve arg2)

static QDataStream	Write (QDataStream arg1, QRectF arg2)

static QDataStream	Write (QDataStream arg1, QDateTime arg2)

static QDataStream	Write (QDataStream arg1, QUrl arg2)

static QDataStream	Write (QDataStream arg1, QTime arg2)

static QDataStream	Write (QDataStream arg1, QLocale arg2)

static QDataStream	Write (QDataStream arg1, QBitArray arg2)

static QDataStream	Write (QDataStream arg1, QUuid arg2)

static QDataStream	Write (QDataStream arg1, QLine arg2)

static QDataStream	Write (QDataStream arg1, QDate arg2)

static QDataStream	Write (QDataStream @out, QRegExp regExp)

static QDataStream	Write (QDataStream arg1, QRect arg2)

static QDataStream	Write (QDataStream arg1, QSize arg2)

static QDataStream	Write (QDataStream s, QVariant.Type p)

static QDataStream	Write (QDataStream arg1, string arg2)

static QDataStream	Write (QDataStream @out, System.Collections.Generic.List< string > list)

static QDataStream	Read (QDataStream arg1, QChar arg2)

static QDataStream	Read (QDataStream arg1, QLocale arg2)

static QDataStream	Read (QDataStream arg1, QRect arg2)

static QDataStream	Read (QDataStream arg1, QEasingCurve arg2)

static QDataStream	Read (QDataStream arg1, QDate arg2)

static QDataStream	Read (QDataStream arg1, QUrl arg2)

static QDataStream	Read (QDataStream arg1, QUuid arg2)

static QTextStream	Read (QTextStream s, Qt.FuncQTextStreamQTextStream f)

static QDataStream	Read (QDataStream arg1, QLineF arg2)

static QDataStream	Read (QDataStream arg1, QRectF arg2)

static QDataStream	Read (QDataStream arg1, QPointF arg2)

static QDataStream	Read (QDataStream arg1, QLine arg2)

static QDataStream	Read (QDataStream arg1, QBitArray arg2)

static QDataStream	Read (QDataStream arg1, QSize arg2)

static QDataStream	Read (QDataStream arg1, QDateTime arg2)

static QDataStream	Read (QDataStream arg1, QTime arg2)

static QDataStream	Read (QDataStream arg1, QPoint arg2)

static QDataStream	Read (QDataStream @in, QRegExp regExp)

static QDataStream	Read (QDataStream s, object p)

static QDataStream	Read (QDataStream arg1, QByteArray arg2)

static QDataStream	Read (QDataStream arg1, QSizeF arg2)

static QDataStream	Read (QDataStream arg1, string arg2)

static QDataStream	Read (QDataStream s, QVariant.Type p)

static QDataStream	Read (QDataStream @in, System.Collections.Generic.List< string > list)

static double	qAcos (double v)

static void	qAddPostRoutine (System.Action arg1)

static string	qAppName ()

static double	qAsin (double v)

static double	qAtan (double v)

static double	qAtan2 (double x, double y)

static void	qBadAlloc ()

static int	qCeil (double v)

static ushort	qChecksum (string s, uint len)

static QByteArray	qCompress (QByteArray data)

static QByteArray	qCompress (QByteArray data, int compressionLevel=-1)

static QByteArray	qCompress (Pointer< byte > data, int nbytes)

static QByteArray	qCompress (Pointer< byte > data, int nbytes, int compressionLevel=-1)

static double	qCos (double v)

static double	qExp (double v)

static double	qFabs (double v)

static double	qFastCos (double x)

static double	qFastSin (double x)

static string	qFlagLocation (string method)

static int	qFloor (double v)

static bool	qFuzzyCompare (double p1, double p2)

static bool	qFuzzyCompare (float p1, float p2)

static bool	qFuzzyIsNull (double d)

static bool	qFuzzyIsNull (float f)

static uint	qHash (QBitArray key)

static uint	qHash (QChar key)

static uint	qHash (QStringRef key)

static uint	qHash (QUrl url)

static uint	qHash (QPersistentModelIndex index)

static uint	qHash (QByteArray key)

static uint	qHash (QModelIndex index)

static uint	qHash (uint key)

static uint	qHash (sbyte key)

static uint	qHash (byte key)

static uint	qHash (short key)

static uint	qHash (NativeLong key)

static uint	qHash (ushort key)

static uint	qHash (long key)

static uint	qHash (ulong key)

static uint	qHash (int key)

static uint	qHash (string key)

static uint	qHash (NativeULong key)

static double	qInf ()

static Qt.ActionQtMsgTypeString	qInstallMsgHandler (Qt.ActionQtMsgTypeString arg1)

static int	qIntCast (float f)

static int	qIntCast (double f)

static bool	qIsFinite (double d)

static bool	qIsFinite (float f)

static bool	qIsInf (float f)

static bool	qIsInf (double d)

static bool	qIsNaN (float f)

static bool	qIsNaN (double d)

static bool	qIsNull (float f)

static bool	qIsNull (double d)

static double	qLn (double v)

static double	qPow (double x, double y)

static double	qQNaN ()

static void	qRegisterStaticPluginInstanceFunction (Qt.FuncQObject function)

static void	qRemovePostRoutine (System.Action arg1)

static int	qRound (double d)

static long	qRound64 (double d)

static double	qSNaN ()

static bool	qSharedBuild ()

static double	qSin (double v)

static double	qSqrt (double v)

static bool	qStringComparisonHelper (QStringRef s1, string s2)

static double	qTan (double v)

static QByteArray	qUncompress (QByteArray data)

static QByteArray	qUncompress (Pointer< byte > data, int nbytes)

static string	qVersion ()

static void	Qbswap_helper (Pointer< byte > src, Pointer< byte > dest, int size)

static QByteArray	Qgetenv (string varName)

static bool	Qputenv (string varName, QByteArray value)

static int	Qrand ()

static void	Qsrand (uint seed)

static int	Qstrcmp (QByteArray str1, QByteArray str2)

static int	Qstrcmp (QByteArray str1, string str2)

static int	Qstrcmp (string str1, QByteArray str2)

static int	Qstrcmp (string str1, string str2)

static Pointer< sbyte >	Qstrcpy (Pointer< sbyte > dst, string src)

static Pointer< sbyte >	Qstrdup (string arg1)

static int	Qstricmp (string arg1, string arg2)

static uint	Qstrlen (string str)

static int	Qstrncmp (string str1, string str2, uint len)

static Pointer< sbyte >	Qstrncpy (Pointer< sbyte > dst, string src, uint len)

static int	Qstrnicmp (string arg1, string arg2, uint len)

static uint	Qstrnlen (string str, uint maxlen)

static string	QtTrId (string id, int n=-1)

Protected Member Functions
	QApplication (System.Type dummy)

new void	OnCommitDataRequest (QSessionManager sessionManager)


new void	OnFocusChanged (QWidget old, QWidget now)


new void	OnFontDatabaseChanged ()


new void	OnLastWindowClosed ()


new void	OnSaveStateRequest (QSessionManager sessionManager)


Protected Member Functions inherited from QtCore.QCoreApplication
	QCoreApplication (System.Type dummy)

new void	OnAboutToQuit ()


new void	OnUnixSignal (int arg1)

Protected Member Functions inherited from QtCore.QObject
	QObject (System.Type dummy)

virtual void	OnChildEvent (QChildEvent arg1)


virtual void	ConnectNotify (string signal)


virtual void	OnCustomEvent (QEvent arg1)


new void	OnDestroyed (QObject arg1=null)


virtual void	DisconnectNotify (string signal)


new int	Receivers (string signal)


new QObject	Sender ()


new int	SenderSignalIndex ()


virtual void	OnTimerEvent (QTimerEvent arg1)

Properties
Slot	LastWindowClosed


Slot< QWidget, QWidget >	FocusChanged


Slot	FontDatabaseChanged


Slot< QSessionManager >	CommitDataRequest


Slot< QSessionManager >	SaveStateRequest


static QWidget	ActiveWindow `[get, set]`


static int	colorSpec `[get, set]`


static bool	DesktopSettingsAware `[get, set]`


new QInputContext	InputContext `[get, set]`


static QCursor	OverrideCursor `[get, set]`


static QStyle	Style `[get, set]`


new Qt.LayoutDirection	LayoutDirection `[get, set]`


new QIcon	WindowIcon `[get, set]`


new int	CursorFlashTime `[get, set]`


new int	DoubleClickInterval `[get, set]`


new int	KeyboardInputInterval `[get, set]`


new int	WheelScrollLines `[get, set]`


new QSize	GlobalStrut `[get, set]`


new int	StartDragTime `[get, set]`


new int	StartDragDistance `[get, set]`

new bool	QuitOnLastWindowClosed `[get, set]`


new string	StyleSheet `[get, set]`


new bool	AutoSipEnabled `[get, set]`


static new QMetaObject	StaticMetaObject `[get]`

new IQApplicationSignals	Emit `[get]`

Properties inherited from QtCore.QCoreApplication
Slot	AboutToQuit


Slot< System.Int32 >	UnixSignal

static System.Collections.Generic.List < string >	LibraryPaths `[get, set]`


new string	ApplicationName `[get, set]`


new string	ApplicationVersion `[get, set]`


new string	OrganizationName `[get, set]`


new string	OrganizationDomain `[get, set]`


static new QMetaObject	StaticMetaObject `[get]`

new IQCoreApplicationSignals	Emit `[get]`

Properties inherited from QtCore.QObject
virtual EventHandler < QEventArgs< QChildEvent > >	ChildEvent


virtual EventHandler < QEventArgs< QEvent > >	CustomEvent


virtual EventHandler < QEventArgs< QEvent > >	Event


virtual EventHandler < QEventArgs< QTimerEvent > >	TimerEvent


Slot< QObject >	DestroyedQObject

Slot	Destroyed


new QObject	Parent `[get, set]`


virtual System.IntPtr	SmokeObject `[get, set]`

new string	ObjectName `[get, set]`


static new QMetaObject	StaticMetaObject `[get]`


static new QMetaObject	StaticQtMetaObject `[get]`

new IQObjectSignals	Emit `[get]`

Additional Inherited Members
Protected Attributes inherited from QtCore.QObject
object	Q_EMIT = null

SmokeInvocation	interceptor

readonly List< QEventHandler >	eventFilters = new List<QEventHandler>()

Detailed Description

The QApplication class manages the GUI application's control flow and main settings.

QApplication contains the main event loop, where all events from the window system and other sources are processed and dispatched. It also handles the application's initialization, finalization, and provides session management. In addition, QApplication handles most of the system-wide and application-wide settings.

For any GUI application using Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any given time. For non-GUI Qt applications, use QCoreApplication instead, as it does not depend on the QtGui library.

The QApplication object is accessible through the instance() function that returns a pointer equivalent to the global qApp pointer.

QApplication's main areas of responsibility are:

It initializes the application with the user's desktop settings such as palette(), font() and doubleClickInterval(). It keeps track of these properties in case the user changes the desktop globally, for example through some kind of control panel.

It performs event handling, meaning that it receives events from the underlying window system and dispatches them to the relevant widgets. By using sendEvent() and postEvent() you can send your own events to widgets.

It parses common command line arguments and sets its internal state accordingly. See the constructor documentation below for more details.

It defines the application's look and feel, which is encapsulated in a QStyle object. This can be changed at runtime with setStyle().

It specifies how the application is to allocate colors. See setColorSpec() for details.

It provides localization of strings that are visible to the user via translate().

It provides some magical objects like the desktop() and the clipboard().

It knows about the application's windows. You can ask which widget is at a certain position using widgetAt(), get a list of topLevelWidgets() and closeAllWindows(), etc.

It manages the application's mouse cursor handling, see setOverrideCursor()

On the X window system, it provides functions to flush and sync the communication stream, see flushX() and syncX().

It provides support for sophisticated session management. This makes it possible for applications to terminate gracefully when the user logs out, to cancel a shutdown process if termination isn't possible and even to preserve the entire application's state for a future session. See isSessionRestored(), sessionId() and commitData() and saveState() for details.

Since the QApplication object does so much initialization, it must be created before any other objects related to the user interface are created. QApplication also deals with common command line arguments. Hence, it is usually a good idea to create it before any interpretation or modification of argv is done in the application itself.

Groups of functions

System settings desktopSettingsAware(), setDesktopSettingsAware(), cursorFlashTime(), setCursorFlashTime(), doubleClickInterval(), setDoubleClickInterval(), setKeyboardInputInterval(), wheelScrollLines(), setWheelScrollLines(), palette(), setPalette(), font(), setFont(), fontMetrics().

Event handling exec(), processEvents(), exit(), quit(). sendEvent(), postEvent(), sendPostedEvents(), removePostedEvents(), hasPendingEvents(), notify(), macEventFilter(), qwsEventFilter(), x11EventFilter(), x11ProcessEvent(), winEventFilter().

GUI Styles style(), setStyle().

Color usage colorSpec(), setColorSpec(), qwsSetCustomColors().

Text handling installTranslator(), removeTranslator() translate().

Widgets allWidgets(), topLevelWidgets(), desktop(), activePopupWidget(), activeModalWidget(), clipboard(), focusWidget(), activeWindow(), widgetAt().

Advanced cursor handling overrideCursor(), setOverrideCursor(), restoreOverrideCursor().

X Window System synchronization flushX(), syncX().

Session management isSessionRestored(), sessionId(), commitData(), saveState().

Miscellaneous closeAllWindows(), startingUp(), closingDown(), type().

See also QCoreApplication, QAbstractEventDispatcher, QEventLoop, and QSettings.

Member Enumeration Documentation

enum QtGui.QApplication.ColorSpec

See setColorSpec() for full details.

Enumerator:

CustomColor	The same as NormalColor for X11; allocates colors to a palette on demand under Windows
ManyColor	The right choice for applications that use thousands of colors
NormalColor	The default color allocation policy

enum QtGui.QApplication.Type

Enumerator:

GuiClient	A GUI client application
GuiServer	A GUI server application (for Qt for Embedded Linux)
Tty	A console application

Constructor & Destructor Documentation

QtGui.QApplication.QApplication ( System.Type dummy )

protected

Member Function Documentation

static void QtGui.QApplication.AboutQt ( )

static

Displays a simple message box about Qt. The message includes the version number of Qt being used by the application.

This is useful for inclusion in the Help menu of an application, as shown in the Menus example.

This function is a convenience slot for QMessageBox::aboutQt().

static QWidget QtGui.QApplication.ActiveModalWidget ( )

static

Returns the active modal widget.

A modal widget is a special top-level widget which is a subclass of QDialog that specifies the modal parameter of the constructor as true. A modal widget must be closed before the user can continue with other parts of the program.

Modal widgets are organized in a stack. This function returns the active modal widget at the top of the stack.

See also activePopupWidget() and topLevelWidgets().

static QWidget QtGui.QApplication.ActivePopupWidget ( )

static

Returns the active popup widget.

A popup widget is a special top-level widget that sets the Qt::WType_Popup widget flag, e.g. the QMenu widget. When the application opens a popup widget, all events are sent to the popup. Normal widgets and modal widgets cannot be accessed before the popup widget is closed.

Only other popup widgets may be opened when a popup widget is shown. The popup widgets are organized in a stack. This function returns the active popup widget at the top of the stack.

See also activeModalWidget() and topLevelWidgets().

static void QtGui.QApplication.Alert	(	QWidget	widget,
		int	duration = `0`
	)

static

Causes an alert to be shown for widget if the window is not the active window. The alert is shown for msec miliseconds. If msec is zero (the default), then the alert is shown indefinitely until the window becomes active again.

Currently this function does nothing on Qt for Embedded Linux.

On Mac OS X, this works more at the application level and will cause the application icon to bounce in the dock.

On Windows, this causes the window's taskbar entry to flash for a time. If msec is zero, the flashing will stop and the taskbar entry will turn a different color (currently orange).

On X11, this will cause the window to be marked as "demands attention", the window must not be hidden (i.e. not have hide() called on it, but be visible in some sort of way) in order for this to work.

This function was introduced in Qt 4.3.

static System.Collections.Generic.List<QWidget> QtGui.QApplication.AllWidgets ( )

static

Returns a list of all the widgets in the application.

The list is empty (QList::isEmpty()) if there are no widgets.

Note: Some of the widgets may be hidden.

Example:

void updateAllWidgets()

{

foreach (QWidget *widget, QApplication::allWidgets())

widget->update();

}

See also topLevelWidgets() and QWidget::isVisible().

static void QtGui.QApplication.Beep ( )

static

Sounds the bell, using the default volume and sound. The function is not available in Qt for Embedded Linux.

static void QtGui.QApplication.ChangeOverrideCursor ( QCursor arg1 )

static

Changes the currently active application override cursor to cursor.

This function has no effect if setOverrideCursor() was not called.

See also setOverrideCursor(), overrideCursor(), restoreOverrideCursor(), and QWidget::setCursor().

static QClipboard QtGui.QApplication.Clipboard ( )

static

Returns a pointer to the application global clipboard.

Note: The QApplication object should already be constructed before accessing the clipboard.

static void QtGui.QApplication.CloseAllWindows ( )

static

Closes all top-level windows.

This function is particularly useful for applications with many top-level windows. It could, for example, be connected to a Exit entry in the File menu:

exitAct = new QAction(tr("E&xit"), this);

exitAct->setShortcuts(QKeySequence::Quit);

exitAct->setStatusTip(tr("Exit the application"));

connect(exitAct, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));

The windows are closed in random order, until one window does not accept the close event. The application quits when the last window was successfully closed; this can be turned off by setting quitOnLastWindowClosed to false.

See also quitOnLastWindowClosed, lastWindowClosed(), QWidget::close(), QWidget::closeEvent(), lastWindowClosed(), quit(), topLevelWidgets(), and QWidget::isWindow().

virtual void QtGui.QApplication.CommitData ( QSessionManager sm )

virtual

This function deals with session management. It is invoked when the QSessionManager wants the application to commit all its data.

Usually this means saving all open files, after getting permission from the user. Furthermore you may want to provide a means by which the user can cancel the shutdown.

You should not exit the application within this function. Instead, the session manager may or may not do this afterwards, depending on the context.

Warning: Within this function, no user interaction is possible, unless you ask the manager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details and example usage.

The default implementation requests interaction and sends a close event to all visible top-level widgets. If any event was rejected, the shutdown is canceled.

See also isSessionRestored(), sessionId(), saveState(), and Session Management.

override void QtGui.QApplication.CreateProxy ( )

virtual

Reimplemented from QtCore.QCoreApplication.

static QDesktopWidget QtGui.QApplication.Desktop ( )

static

Returns the desktop widget (also called the root window).

The desktop may be composed of multiple screens, so it would be incorrect, for example, to attempt to center some widget in the desktop's geometry. QDesktopWidget has various functions for obtaining useful geometries upon the desktop, such as QDesktopWidget::screenGeometry() and QDesktopWidget::availableGeometry().

On X11, it is also possible to draw on the desktop.

new void QtGui.QApplication.Dispose ( )

static QWidget QtGui.QApplication.FocusWidget ( )

static

Returns the application widget that has the keyboard input focus, or 0 if no widget in this application has the focus.

See also QWidget::setFocus(), QWidget::hasFocus(), activeWindow(), and focusChanged().

static QFont QtGui.QApplication.Font ( )

static

Returns the default application font.

See also setFont(), fontMetrics(), and QWidget::font().

static QFont QtGui.QApplication.Font ( QWidget arg1 )

static

This is an overloaded function.

Returns the default font for the widget.

See also fontMetrics() and QWidget::setFont().

static QFont QtGui.QApplication.Font ( string className )

static

This is an overloaded function.

Returns the font for widgets of the given className.

Property Documentation

QWidget QtGui.QApplication.ActiveWindow

staticgetset

Returns the application top-level window that has the keyboard input focus, or 0 if no application window has the focus. There might be an activeWindow() even if there is no focusWidget(), for example if no widget in that window accepts key events.

Sets the active window to the active widget in response to a system event. The function is called from the platform specific event handlers.

Warning: This function does not set the keyboard focus to the active widget. Call QWidget::activateWindow() instead.

It sets the activeWindow() and focusWidget() attributes and sends proper WindowActivate/WindowDeactivate and FocusIn/FocusOut events to all appropriate widgets. The window will then be painted in active state (e.g. cursors in line edits will blink), and it will have tool tips enabled.

new bool QtGui.QApplication.AutoSipEnabled

getset

This property holds toggles automatic SIP (software input panel) visibility.

Set this property to true to automatically display the SIP when entering widgets that accept keyboard input. This property only affects widgets with the WA_InputMethodEnabled attribute set, and is typically used to launch a virtual keyboard on devices which have very few or no keys.

The property only has an effect on platforms which use software input panels, such as Windows CE and Symbian.

The default is platform dependent.

This property was introduced in Qt 4.5.

int QtGui.QApplication.colorSpec

staticgetset

Returns the color specification.

Sets the color specification for the application to spec.

The color specification controls how the application allocates colors when run on a display with a limited amount of colors, e.g. 8 bit / 256 color displays.

The color specification must be set before you create the QApplication object.

The options are:

QApplication::NormalColor. This is the default color allocation strategy. Use this option if your application uses buttons, menus, texts and pixmaps with few colors. With this option, the application uses system global colors. This works fine for most applications under X11, but on the Windows platform, it may cause dithering of non-standard colors.

QApplication::CustomColor. Use this option if your application needs a small number of custom colors. On X11, this option is the same as NormalColor. On Windows, Qt creates a Windows palette, and allocates colors to it on demand.

QApplication::ManyColor. Use this option if your application is very color hungry, e.g., it requires thousands of colors. Under X11 the effect is:

For 256-color displays which have at best a 256 color true color visual, the default visual is used, and colors are allocated from a color cube. The color cube is the 6x6x6 (216 color) "Web palette" (the red, green, and blue components always have one of the following values: 0x00, 0x33, 0x66, 0x99, 0xCC, or 0xFF), but the number of colors can be changed by the -ncols option. The user can force the application to use the true color visual with the -visual option.

For 256-color displays which have a true color visual with more than 256 colors, use that visual. Silicon Graphics X servers this feature, for example. They provide an 8 bit visual by default but can deliver true color when asked.

On Windows, Qt creates a Windows palette, and fills it with a color cube.

Slot<QSessionManager> QtGui.QApplication.CommitDataRequest

addremove

This signal deals with session management. It is emitted when the QSessionManager wants the application to commit all its data.

Usually this means saving all open files, after getting permission from the user. Furthermore you may want to provide a means by which the user can cancel the shutdown.

You should not exit the application within this signal. Instead, the session manager may or may not do this afterwards, depending on the context.

Warning: Within this signal, no user interaction is possible, unless you ask the manager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details and example usage.

Note: You should use Qt::DirectConnection when connecting to this signal.

This function was introduced in Qt 4.2.

See also isSessionRestored(), sessionId(), saveState(), and Session Management.

new int QtGui.QApplication.CursorFlashTime

getset

This property holds the text cursor's flash (blink) time in milliseconds.

The flash time is the time required to display, invert and restore the caret display. Usually the text cursor is displayed for half the cursor flash time, then hidden for the same amount of time, but this may vary.

The default value on X11 is 1000 milliseconds. On Windows, the Control Panel value is used and setting this property sets the cursor flash time for all applications.

We recommend that widgets do not cache this value as it may change at any time if the user changes the global desktop settings.

bool QtGui.QApplication.DesktopSettingsAware

staticgetset

Returns true if Qt is set to use the system's standard colors, fonts, etc.; otherwise returns false. The default is true.

Sets whether Qt should use the system's standard colors, fonts, etc., to on. By default, this is true.

This function must be called before creating the QApplication object, like this:

int main(int argc, char *argv[])

{

QApplication::setDesktopSettingsAware(false);

QApplication app(argc, argv);

...

return app.exec();

}

new int QtGui.QApplication.DoubleClickInterval

getset

This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks.

The default value on X11 is 400 milliseconds. On Windows and Mac OS, the operating system's value is used. However, on Windows and Symbian OS, calling this function sets the double click interval for all applications.

new IQApplicationSignals QtGui.QApplication.Emit

getprotected

Slot<QWidget,QWidget> QtGui.QApplication.FocusChanged

addremove

This signal is emitted when the widget that has keyboard focus changed from old to now, i.e., because the user pressed the tab-key, clicked into a widget or changed the active window. Both old and now can be the null-pointer.

The signal is emitted after both widget have been notified about the change through QFocusEvent.

This function was introduced in Qt 4.1.

See also QWidget::setFocus(), QWidget::clearFocus(), and Qt::FocusReason.

Slot QtGui.QApplication.FontDatabaseChanged

addremove

This signal is emitted when application fonts are loaded or removed.

This function was introduced in Qt 4.5.

See also QFontDatabase::addApplicationFont(), QFontDatabase::addApplicationFontFromData(), QFontDatabase::removeAllApplicationFonts(), and QFontDatabase::removeApplicationFont().

new QSize QtGui.QApplication.GlobalStrut

getset

This property holds the minimum size that any GUI element that the user can interact with should have.

For example, no button should be resized to be smaller than the global strut size. The strut size should be considered when reimplementing GUI controls that may be used on touch-screens or similar I/O devices.

Example:

QSize MyWidget::sizeHint() const

{

return QSize(80, 25).expandedTo(QApplication::globalStrut());

}

By default, this property contains a QSize object with zero width and height.

new QInputContext QtGui.QApplication.InputContext

getset

Returns the QInputContext instance used by the application.

This function replaces the QInputContext instance used by the application with inputContext.

Qt takes ownership of the given inputContext.

new int QtGui.QApplication.KeyboardInputInterval

getset

This property holds the time limit in milliseconds that distinguishes a key press from two consecutive key presses.

The default value on X11 is 400 milliseconds. On Windows and Mac OS, the operating system's value is used.

This property was introduced in Qt 4.2.

Slot QtGui.QApplication.LastWindowClosed

addremove

This signal is emitted from QApplication::exec() when the last visible primary window (i.e. window with no parent) with the Qt::WA_QuitOnClose attribute set is closed.

By default,

this attribute is set for all widgets except transient windows such as splash screens, tool windows, and popup menus

QApplication implicitly quits when this signal is emitted.

This feature can be turned off by setting quitOnLastWindowClosed to false.

new void QtGui.QApplication.WinFocus	(	QWidget	arg1,
		bool	arg2
	)

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