Manages the control flow and main settings of a GUI application. More...

Inheritance diagram for QApplication:

Public Typedefs
using	FP_Void = void (*)()

Public Types
enum	ColorSpec

Public Signals
void	applicationStateChanged (Qt::ApplicationState state)

void	commitDataRequest (QSessionManager *sessionManager)

void	focusChanged (QWidget old, QWidget current)

void	focusObjectChanged (QObject *focusObject)

void	focusWindowChanged (QWindow *focusWindow)

void	fontDatabaseChanged ()

void	lastWindowClosed ()

void	layoutDirectionChanged (Qt::LayoutDirection direction)

void	paletteChanged (const QPalette &palette)

void	primaryScreenChanged (QScreen *screen)

void	saveStateRequest (QSessionManager *sessionManager)

void	screenAdded (QScreen *screen)

void	screenRemoved (QScreen *screen)

Public Signals inherited from QCoreApplication
void	aboutToQuit ()

void	unixSignal (int signalId)

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Slots
static void	aboutCs ()

bool	autoSipEnabled ()

static void	closeAllWindows ()

void	setAutoSipEnabled (const bool enabled)

void	setStyleSheet (const QString &sheet)

Public Slots inherited from QCoreApplication
static void	quit ()

Public Slots inherited from QObject
void	deleteLater ()

Public Methods
	QApplication (int &argc, char **argv)

virtual	~QApplication ()

qreal	devicePixelRatio () const

bool	isSavingSession () const

bool	isSessionRestored () const

bool	notify (QObject receiver, QEvent event) override

QString	sessionId () const

QString	sessionKey () const

QString	styleSheet () const

Public Methods inherited from QCoreApplication
	QCoreApplication (int &argc, char **argv)

	~QCoreApplication ()

void	installNativeEventFilter (QAbstractNativeEventFilter *filterObj)

void	removeNativeEventFilter (QAbstractNativeEventFilter *filterObj)

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Static Public Methods
static QWidget *	activeModalWidget ()

static QWidget *	activePopupWidget ()

static QWidget *	activeWindow ()

static void	alert (QWidget *widget, int duration=0)

static QWidgetList	allWidgets ()

static QWindowList	allWindows ()

static QString	applicationDisplayName ()

static Qt::ApplicationState	applicationState ()

static void	beep ()

static void	changeOverrideCursor (const QCursor &cursor)

static QClipboard *	clipboard ()

static int	colorSpec ()

static int	cursorFlashTime ()

static QDesktopWidget *	desktop ()

static bool	desktopSettingsAware ()

static int	doubleClickInterval ()

static int	exec ()

static QObject *	focusObject ()

static QWidget *	focusWidget ()

static QWindow *	focusWindow ()

static QFont	font ()

static QFont	font (const QString &className)

static QFont	font (const QWidget *widget)

static QFontMetrics	fontMetrics ()

static QSize	globalStrut ()

static QInputMethod *	inputMethod ()

static bool	isEffectEnabled (Qt::UIEffect effect)

static bool	isFallbackSessionManagementEnabled ()

static bool	isLeftToRight ()

static bool	isRightToLeft ()

static int	keyboardInputInterval ()

static Qt::KeyboardModifiers	keyboardModifiers ()

static Qt::LayoutDirection	layoutDirection ()

static QWindow *	modalWindow ()

static Qt::MouseButtons	mouseButtons ()

static QCursor *	overrideCursor ()

static QPalette	palette ()

static QPalette	palette (const QString &className)

static QPalette	palette (const QWidget *widget)

static FP_Void	platformFunction (const QByteArray &function)

static QString	platformName ()

static QPlatformNativeInterface *	platformNativeInterface ()

static QScreen *	primaryScreen ()

static Qt::KeyboardModifiers	queryKeyboardModifiers ()

static bool	quitOnLastWindowClosed ()

static void	restoreOverrideCursor ()

static QList< QScreen * >	screens ()

static void	setActiveWindow (QWidget *active)

static void	setApplicationDisplayName (const QString &name)

static void	setColorSpec (int spec)

static void	setCursorFlashTime (int duration)

static void	setDesktopSettingsAware (bool on)

static void	setDoubleClickInterval (int interval)

static void	setEffectEnabled (Qt::UIEffect effect, bool enable=true)

static void	setFallbackSessionManagementEnabled (bool enable)

static void	setFont (const QFont &font, const QString &className=QString ())

static void	setGlobalStrut (const QSize &size)

static void	setKeyboardInputInterval (int interval)

static void	setLayoutDirection (Qt::LayoutDirection direction)

static void	setOverrideCursor (const QCursor &cursor)

static void	setPalette (const QPalette &palette, const QString &className=QString ())

static void	setQuitOnLastWindowClosed (bool quit)

static void	setStartDragDistance (int distance)

static void	setStartDragTime (int time)

static QStyle *	setStyle (const QString &style)

static void	setStyle (QStyle *style)

static void	setWheelScrollLines (int lines)

static void	setWindowIcon (const QIcon &icon)

static int	startDragDistance ()

static int	startDragTime ()

static QStyle *	style ()

static QStyleHints *	styleHints ()

static void	sync ()

static QWidget *	topLevelWidgetAt (const QPoint &pos)

static QWidgetList	topLevelWidgets ()

static QWindow *	topLevelWindowAt (const QPoint &pos)

static QWindowList	topLevelWindows ()

static int	wheelScrollLines ()

static QWidget *	widgetAt (const QPoint &point)

static QWidget *	widgetAt (int x, int y)

static QIcon	windowIcon ()

Static Public Methods inherited from QCoreApplication
static void	addLibraryPath (const QString &path)

static QString	applicationDirPath ()

static QString	applicationFilePath ()

static QString	applicationName ()

static qint64	applicationPid ()

static QString	applicationVersion ()

static QStringList	arguments ()

static bool	closingDown ()

static int	exec ()

static void	exit (int returnCode=0)

static void	flush ()

static void	installTranslator (QTranslator *translationFile)

static QCoreApplication *	instance ()

static bool	isQuitLockEnabled ()

static bool	isSetuidAllowed ()

static QStringList	libraryPaths ()

static QString	organizationDomain ()

static QString	organizationName ()

static void	postEvent (QObject receiver, QEvent event, int priority=Qt::NormalEventPriority)

static void	processEvents (QEventLoop::ProcessEventsFlags flags, int maxtime)

static void	processEvents (QEventLoop::ProcessEventsFlags flags=QEventLoop::AllEvents)

static void	removeLibraryPath (const QString &path)

static void	removePostedEvents (QObject *receiver, int eventType=0)

static void	removeTranslator (QTranslator *translationFile)

static bool	sendEvent (QObject receiver, QEvent event)

static void	sendPostedEvents (QObject *receiver=nullptr, int event_type=0)

static void	setApplicationName (const QString &application)

static void	setApplicationVersion (const QString &version)

static void	setAttribute (Qt::ApplicationAttribute attribute, bool on=true)

static void	setLibraryPaths (const QStringList &paths)

static void	setOrganizationDomain (const QString &orgDomain)

static void	setOrganizationName (const QString &orgName)

static void	setQuitLockEnabled (bool enabled)

static void	setSetuidAllowed (bool allow)

static bool	startingUp ()

static bool	testAttribute (Qt::ApplicationAttribute attribute)

static QString	translate (const char context, const char text, const char *comment=nullptr, std::optional< int > numArg=std::optional< int >())

static QString	translate (const QString &context, const QString &text, const QString &comment=QString (), std::optional< int > numArg=std::optional< int >())

Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Protected Methods
bool	event (QEvent *event) override

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Properties
	applicationDisplayName

	autoSipEnabled

	cursorFlashTime

	doubleClickInterval

	globalStrut

	keyboardInputInterval

	layoutDirection

	platformName

	primaryScreen

	quitOnLastWindowClosed

	startDragDistance

	startDragTime

	styleSheet

	wheelScrollLines

	windowIcon

Properties inherited from QCoreApplication
	applicationName

	applicationVersion

	organizationDomain

	organizationName

	quitLockEnabled

Properties inherited from QObject
	objectName

Friends
class	QAction

class	QGraphicsItem

class	QGraphicsScene

class	QGraphicsWidget

class	QLineEdit

class	QPlatformIntegration

class	QPlatformSessionManager

class	QShortcut

class	QTranslator

class	QWidget

Additional Inherited Members
Related Functions inherited from QCoreApplication
void	qAddPostRoutine (QtCleanUpFunction ptr)

void	qRemovePostRoutine (QtCleanUpFunction ptr)

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

The QApplication class manages the control flow and main settings of a GUI application. 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 initialization, finalization, and provides session management.

For any CopperSpice GUI application there is precisely one QApplication object, no matter how many windows are open at any given time. For non-GUI CopperSpice applications use QCoreApplication since it does not depend on the CsGui library.

The QApplication object is accessible through the QApplication::instance() method which returns a pointer to this object. The global qApp pointer is equivalent to calling this instance() method.

Class Overview

The following is a summary of the key functionality for this class.

Initialize the application with the user's desktop settings such as palette(), font() and doubleClickInterval().
Keeps track of properties when the use changes the desktop globally, for example through the operating system control panel.
Performs event handling to receive events from the underlying window system and dispatch to the corresponding widgets. Use sendEvent() and postEvent().
Parses command line arguments during initialization, refer to constructor methods for more information.
Defines the application look and feel, which is encapsulated in a QStyle object. This can be changed at runtime with setStyle().
Specifies how the application uses colors, refer to setColorSpec() for more details.
Provides localization of strings that are visible to the user via translate().
Provides global objects like desktop() and clipboard().
Tracks the windows and widgets in a an application, refer to widgetAt(), topLevelWidgets() and closeAllWindows(), etc.
Manages the application mouse cursor handling, refer to setOverrideCursor()

Functionality Overview

QApplication must be created before any other any GUI classes are set up or used.

Categories	Groups of Methods
System settings	desktopSettingsAware(), setDesktopSettingsAware(), cursorFlashTime(), setCursorFlashTime(), doubleClickInterval(), setDoubleClickInterval(), setKeyboardInputInterval(), wheelScrollLines(), setWheelScrollLines(), palette(), setPalette(), font(), setFont(), fontMetrics()
Event handling	exec(), exit(), quit(), processEvents(), postEvent(), sendEvent(), sendPostedEvents(), removePostedEvents(), notify()
GUI Styles	style(), setStyle()
Color usage	colorSpec(), setColorSpec()
Text handling	installTranslator(), removeTranslator() translate()
Widgets	allWidgets(), topLevelWidgets(), desktop(), activePopupWidget(), activeModalWidget(), clipboard(), focusWidget(), activeWindow(), widgetAt()
Cursor handling	overrideCursor(), setOverrideCursor(), restoreOverrideCursor()
Miscellaneous	closeAllWindows(), startingUp(), closingDown()

See also: QCoreApplication, QAbstractEventDispatcher, QEventLoop, QSettings

Member Typedef Documentation

QApplication::FP_Void

Typedef for a function pointer with no arguments which returns void.

Member Enumeration Documentation

enum QApplication::ColorSpec

Constant	Value	Description
`QApplication::NormalColor`	`0`	the default color allocation policy
`QApplication::CustomColor`	`1`	the same as NormalColor for X11; allocates colors to a palette on demand under Windows
`QApplication::ManyColor`	`2`	the right choice for applications that use thousands of colors

Refer to setColorSpec() for full details.

Constructor & Destructor Documentation

QApplication::QApplication	(	int &	argc,
		char **	argv
	)

Initializes the GUI system and starts an application using command line arguments from argc and argv. The data in argv must remain valid for the entire lifetime of the QApplication. The value for argc must be greater than zero and the value for argv must contain at least one valid C style string.

Only one QApplication should be created in a given program and must be constructed before any paint devices are created. The global qApp variable always refers to the current QApplication.

QApplication will parse the following command line options.

-platform platformName: The value for platformName can be cocoa, windows, wayland, or xcb.
-style=styleName: Sets the application GUI style. Possible values for styleName depend on your platform configuration. If CopperSpice was compiled with additional styles or has additional styles as plugins these will be usable for this command line option.
-style styleName: Same as listed above.
-stylesheet=styleSheetPath: Sets the application style sheet. The value for styleSheetPath must be a path to a file which contains the style sheet. Relative URLs in the style sheet file are relative to the Style Sheet file's path.
-stylesheet styleSheetPath: Same as listed above.
-reverse: Sets the application layout direction to Qt::RightToLeft

See also: arguments()

QApplication::~QApplication ( )

virtual

Cleans up any window system resources that were allocated by this application. Sets the global variable qApp to nullptr.

Method Documentation

void QApplication::aboutCs ( )

slot

Displays a simple message box about CopperSpice. The message includes the version number of CopperSpice being used by the application. This is useful for inclusion in the Help menu of your application.

This method is a convenience slot for QMessageBox::aboutCs().

QWidget * QApplication::activeModalWidget ( )

static

Returns the active modal widget.

Modal widgets are organized in a stack and each one is a special top level widget which inherits from QDialog. A modal widget must be closed before the user can continue with other parts of the program.

See also: activePopupWidget(), topLevelWidgets()

QWidget * QApplication::activePopupWidget ( )

static

Returns the active popup widget. Popup widgets are organized in a stack.

A popup widget is a special top level widget with the Qt::WType_Popup flag enabled. When the application opens a popup widget all events are sent to this widget. Other widgets and modal widgets can not be accessed before the popup widget is closed.

Only other popup widgets may be opened while the current popup widget is active.

See also: activeModalWidget(), topLevelWidgets()

QWidget * QApplication::activeWindow ( )

static

Returns the application top level window which has the keyboard input focus or a nullptr if no application window has focus. There might be an active window even if no widget has focus.

See also: focusWidget(), setActiveWindow(), QWidget::setFocus(), QWidget::hasFocus()

void 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 duration in milliseconds. If duration is zero then the alert is shown indefinitely until the window becomes active again.

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 duration is zero, the flashing will stop and the taskbar entry will turn a different color (currently orange).

On X11, this method will cause the window to be marked as "demands attention". The window must not be hidden in order for this marker to be applied.

QWidgetList QApplication::allWidgets ( )

static

Returns a list of all the widgets in the application. The list is empty if there are no widgets.

Note: Some of the widgets may be hidden.

void updateAllWidgets() {
   for (QWidget *widget : QApplication::allWidgets()) {
      widget->update();
   }
}

See also: topLevelWidgets(), QWidget::isVisible()

QWindowList QApplication::allWindows ( )

static

Returns a list of all the windows in the application. The list is empty if there are no windows.

See also: topLevelWindows()

QString QApplication::applicationDisplayName ( )

static

Returns the value of the property applicationDisplayName.

Qt::ApplicationState QApplication::applicationState ( )

static

Returns the value of the property applicationState.

void QApplication::applicationStateChanged ( Qt::ApplicationState state )

signal

This signal is emitted when the state of the application changes.

See also: applicationState()

bool QApplication::autoSipEnabled ( )

slot

Returns the value of the property autoSipEnabled.

void QApplication::beep ( )

static

Sounds the bell using the default volume and sound.

void QApplication::changeOverrideCursor ( const QCursor & cursor )

static

Changes the currently active application override cursor to cursor. This method has no effect if setOverrideCursor() was not called.

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

QClipboard * QApplication::clipboard ( )

static

Returns a pointer to the application global clipboard. The QApplication must be constructed before accessing the clipboard.

void QApplication::closeAllWindows ( )

slot

Closes all top level windows.

This method 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 is successfully closed. This can be turned off by setting quitOnLastWindowClosed to false.

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

int QApplication::colorSpec ( )

static

Returns the color specification.

See also: setColorSpec()

void QApplication::commitDataRequest ( QSessionManager * sessionManager )

signal

This signal is emitted when the QSessionManager wants the application to commit all of its data. Usually this means saving all open files, after getting permission from the user. You may want to provide a way for the user to cancel the shutdown.

Do not exit the application within this signal. You should use Qt::DirectConnection when connecting to this signal.

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

See also: isSessionRestored(), sessionId(), Session Management

int QApplication::cursorFlashTime ( )

static

Returns the value of the property cursorFlashTime.

QDesktopWidget * 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 geometry. This class has various methods for obtaining useful geometries for the desktop such as QDesktopWidget::screenGeometry() and QDesktopWidget::availableGeometry().

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

bool QApplication::desktopSettingsAware ( )

static

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

See also: setDesktopSettingsAware()

qreal QApplication::devicePixelRatio ( ) const

Returns the highest screen device pixel ratio found on the system. This is the ratio between physical pixels and device-independent pixels. Use this method only when you do not know which window you are targeting. If you do know the target window use QWindow::devicePixelRatio() instead.

See also: QWindow::devicePixelRatio()

int QApplication::doubleClickInterval ( )

static

Returns the value of the property doubleClickInterval.

bool QApplication::event ( QEvent * event )

overrideprotectedvirtual

Reimplemented from QCoreApplication::event()

int QApplication::exec ( )

static

Enters the main event loop and waits until the method exit() is called. The return value is whatever value was passed to exit(). You must call this method to start handling events. The main event loop receives events from the window system and dispatches these to the application.

Normally no user interaction can take place before calling this method. As a special case modal widgets like QMessageBox can be used before calling exec(), because modal widgets start a local event loop.

To make your application perform idle processing use a QTimer with 0 timeout. More advanced idle processing schemes can be achieved using processEvents().

Clean up code should be implemented in a slot methods connected to the aboutToQuit() signal.

See also: quitOnLastWindowClosed, QCoreApplication::exit(), QCoreApplication::processEvents(), QCoreApplication::quit()

void QApplication::focusChanged	(	QWidget *	old,
		QWidget *	current
	)

signal

This signal is emitted when the widget that has keyboard focus changes from old to current. For example if the users pressed the tab-key, clicked into a widget or changed the active window. Both old and current can be the null-pointer.

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

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

QObject * QApplication::focusObject ( )

static

This method will return a pointer to the object which has keyboard focus.

void QApplication::focusObjectChanged ( QObject * focusObject )

signal

This signal is emitted when final receiver of events tied to focus is changed. The parameter focusObject is the new receiver.

See also: focusObject()

QWidget * QApplication::focusWidget ( )

static

Returns the application widget that has the keyboard input focus or a nullptr if no widget in this application has focus.

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

QWindow * QApplication::focusWindow ( )

static

Returns the QWindow which receives events tied to focus, such as key events.

void QApplication::focusWindowChanged ( QWindow * focusWindow )

signal

This signal is emitted when the focused window changes. The parameter focusWindow is the new focused window.

See also: focusWindow()

QFont QApplication::font ( )

static

Returns the default application font.

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

QFont QApplication::font ( const QString & className )

static

Returns the font for widgets of the given className.

See also: setFont(), QWidget::font()

QFont QApplication::font ( const QWidget * widget )

static

Returns the default font for the widget.

See also: fontMetrics(), QWidget::setFont()

void QApplication::fontDatabaseChanged ( )

signal

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

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

QFontMetrics QApplication::fontMetrics ( )

static

Returns display (screen) font metrics for the application font.

See also: font(), setFont(), QWidget::fontMetrics(), QPainter::fontMetrics()

QSize QApplication::globalStrut ( )

static

Returns the value of the property globalStrut.

QInputMethod * QApplication::inputMethod ( )

static

Returns the current QInputMethod. The input method contains properties about the state and position of the virtual keyboard. It also provides information about the position of the current focused input element.

See also: QInputMethod

bool QApplication::isEffectEnabled ( Qt::UIEffect effect )

static

Returns true if effect is enabled, otherwise returns false. By default, CopperSpice will try to use the desktop settings. To prevent this, call setDesktopSettingsAware(false). All effects are disabled on screens running at less than 16-bit color depth.

See also: setEffectEnabled(), Qt::UIEffect

bool QApplication::isFallbackSessionManagementEnabled ( )

static

Returns whether QApplication will use fallback session management. The default is true.

If this is true and the session manager allows user interaction, QApplication will try to close toplevel windows after commitDataRequest() has been emitted. If a window cannot be closed, session shutdown will be canceled and the application will keep running.

Fallback session management only benefits applications that have an "are you sure you want to close this window?" feature or other logic that prevents closing a toplevel window depending on certain conditions, and that do nothing to explicitly implement session management. In applications that do implement session management using the proper session management API, fallback session management interferes and may break session management logic.

If all windows are closed due to fallback session management and quitOnLastWindowClosed() returns true, the application will quit before it is explicitly instructed to quit through the platform session management protocol. This may prevent the platform session manager from saving application state.

See also: commitDataRequest(), setFallbackSessionManagementEnabled(), saveStateRequest(), QSessionManager::allowsInteraction(), Session Management

bool QApplication::isLeftToRight ( )

inlinestatic

Returns true if the application layout direction is Qt::LeftToRight, otherwise returns false.

See also: layoutDirection(), isRightToLeft()

bool QApplication::isRightToLeft ( )

inlinestatic

Returns true if the application layout direction is Qt::RightToLeft, otherwise returns false.

See also: layoutDirection(), isLeftToRight()

bool QApplication::isSavingSession ( ) const

Returns true if the application is currently saving the session, otherwise returns false. This is true when commitDataRequest() and saveStateRequest() are emitted, but also when the windows are closed afterwards by session management.

See also: commitDataRequest(), saveStateRequest(), sessionId()

bool QApplication::isSessionRestored ( ) const

Returns true if the application has been restored from an earlier session, otherwise returns false.

See also: commitDataRequest(), saveStateRequest(), sessionId()

int QApplication::keyboardInputInterval ( )

static

Returns the value of the property keyboardInputInterval.

Qt::KeyboardModifiers QApplication::keyboardModifiers ( )

static

Returns the current state of the modifier keys on the keyboard. The current state is updated synchronously as the event queue is emptied of events that will spontaneously change the keyboard state (QEvent::KeyPress and QEvent::KeyRelease events).

This may not reflect the actual keys held on the input device at the time of calling but rather the modifiers as last reported in one of the above events. If no keys are being held, Qt::NoModifier is returned.

See also: mouseButtons(), queryKeyboardModifiers()

void QApplication::lastWindowClosed ( )

signal

This signal is emitted from QApplication::exec() when the last visible top level window 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.

See also: QWidget::close()

Qt::LayoutDirection QApplication::layoutDirection ( )

static

Returns the value of the property layoutDirection.

void QApplication::layoutDirectionChanged ( Qt::LayoutDirection direction )

signal

Sets the value of the property to direction.

QWindow * QApplication::modalWindow ( )

static

Returns the most recently shown modal window. If no modal windows are visible, this method returns a nullptr.

A modal window is a window which has its modality property set to either Qt::WindowModal or Qt::ApplicationModal. A modal window must be closed before the user can continue with other parts of the program. Modal window are organized in a stack. Returns the modal window at the top of the stack.

See also: Qt::WindowModality, QWindow::setModality()

Qt::MouseButtons QApplication::mouseButtons ( )

static

Returns the current state of the buttons on the mouse. The current state is updated synchronously as the event queue is emptied of events that will spontaneously change the mouse state (QEvent::MouseButtonPress and QEvent::MouseButtonRelease events).

This may not reflect the actual buttons held on the input device at the time of calling but rather the mouse buttons as last reported in one of the above events. If no mouse buttons are being held, Qt::NoButton is returned.

See also: keyboardModifiers()

bool QApplication::notify	(	QObject *	receiver,
		QEvent *	event
	)

overridevirtual

Reimplemented from QCoreApplication::notify()

QCursor * QApplication::overrideCursor ( )

static

Returns the active application override cursor. Returns nullptr if no application cursor has been defined.

See also: restoreOverrideCursor(), setOverrideCursor()

QPalette QApplication::palette ( )

static

Returns the application palette.

See also: setPalette(), QWidget::palette()

QPalette QApplication::palette ( const QString & className )

static

Returns the palette for widgets of the given className.

See also: setPalette(), QWidget::palette()

QPalette QApplication::palette ( const QWidget * widget )

static

If a widget is passed, the default palette for the widget's class is returned. This may or may not be the application palette. In most cases there is no special palette for certain types of widgets, but one notable exception is the popup menu under Windows, if the user has defined a special background color for menus in the display settings.

See also: setPalette(), QWidget::palette()

void QApplication::paletteChanged ( const QPalette & palette )

signal

Sets the value of the property to palette.

FP_Void QApplication::platformFunction ( const QByteArray & function )

static

Returns a function pointer to the platformplugin matching the given function.

QString QApplication::platformName ( )

static

Returns the value of the property platformName.

QPlatformNativeInterface * QApplication::platformNativeInterface ( )

static

Returns the platform native interface for platform specific functionality.

QScreen * QApplication::primaryScreen ( )

static

Returns the value of the property primaryScreen.

void QApplication::primaryScreenChanged ( QScreen * screen )

signal

Sets the value of the property to screen.

Qt::KeyboardModifiers QApplication::queryKeyboardModifiers ( )

static

Queries and returns the state of the modifier keys on the keyboard. Unlike keyboardModifiers, this method returns the actual keys held on the input device at the time of calling the method.

It does not rely on the keypress events having been received by this process, which makes it possible to check the modifiers while moving a window, for instance. In most cases you should use keyboardModifiers(), which is faster and more accurate since it contains the state of the modifiers as they were when the currently processed event was received.

See also: keyboardModifiers()

bool QApplication::quitOnLastWindowClosed ( )

static

Returns the value of the property quitOnLastWindowClosed.

void QApplication::restoreOverrideCursor ( )

static

Undoes the last call to setOverrideCursor(). If setOverrideCursor() has been called twice, calling restoreOverrideCursor() will activate the first cursor set. Calling this method a second time restores the original widget cursor.

See also: overrideCursor(), restoreOverrideCursor(), setOverrideCursor()

void QApplication::saveStateRequest ( QSessionManager * sessionManager )

signal

This signal is emitted when the session manager wants the application to preserve its state for a future session. For example, a text editor would create a temporary file that includes the current contents of its edit buffers, the location of the cursor and other aspects of the current editing session. Most session managers will very likely request a saved state immediately after the application has been started. This permits the session manager to learn about the application restart policy.

Do not exit the application within this signal. You should use Qt::DirectConnection when connecting to this signal.

Warning: Within this method no user interaction is possible, unless you ask the sessionManager for explicit permission. Refer to QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details.

See also: commitDataRequest(), isSessionRestored(), sessionId(), Session Management

void QApplication::screenAdded ( QScreen * screen )

signal

This signal is emitted whenever a new screen has been added to the system.

See also: primaryScreen, screenRemoved(), screens()

void QApplication::screenRemoved ( QScreen * screen )

signal

This signal is emitted whenever a screen is removed from the system. It provides an opportunity to manage the windows on the screen before CopperSpice falls back to moving them to the primary screen.

See also: screens(), screenAdded(), QObject::destroyed(), QWindow::setScreen()

QList< QScreen * > QApplication::screens ( )

static

Returns a list of all the screens associated with the windowing system the application is connected to.

QString QApplication::sessionId ( ) const

Returns the current session identifier. If the application has been restored from an earlier session, this identifier is the same as it was in that previous session. The session identifier is guaranteed to be unique both for different applications and for different instances of the same application.

See also: commitDataRequest(), isSessionRestored(), sessionKey(), saveStateRequest()

QString QApplication::sessionKey ( ) const

Returns the session key in the current session. If the application has been restored from an earlier session, this key is the same as it was when the previous session ended. The session key changes with every call of commitDataRequest() or saveStateRequest().

See also: commitDataRequest(), isSessionRestored(), sessionId(), saveStateRequest()

void QApplication::setActiveWindow ( QWidget * active )

static

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

It sets the activewindow and focusWidget attributes and sends WindowActivate / WindowDeactivate and FocusIn / FocusOut events to all appropriate widgets. The current window will then be painted in active state and tool tips will be enabled.

This method does not set the keyboard focus to the active widget. To update the keyboard focus call QWidget::activateWindow() instead.

See also: activeWindow(), QWidget::activateWindow()

void QApplication::setApplicationDisplayName ( const QString & name )

static

Sets the value of the property to name. The given name will appear as a suffix in every window title.

void QApplication::setAutoSipEnabled ( const bool enabled )

slot

Sets the value of the property to enabled.

void QApplication::setColorSpec ( int spec )

static

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, for example 8 bit / 256 color displays. The color specification must be set before you create the QApplication object.

The options are shown below.

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, CopperSpice 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.
For 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, CopperSpice creates a Windows palette and fills it with a color cube.

Be aware that the CustomColor and ManyColor choices may lead to colormap flashing: The foreground application gets (most) of the available colors, while the background windows will look less attractive.

int main(int argc, char *argv[]) {
   QApplication::setColorSpec(QApplication::ManyColor);
   QApplication app(argc, argv);
 
   // ...
 
   return app.exec();
}

See also: colorSpec()

void QApplication::setCursorFlashTime ( int duration )

static

Sets the value of the property to duration.

void QApplication::setDesktopSettingsAware ( bool on )

static

Sets whether CopperSpice should use the system's standard colors, fonts, etc., to on. By default, this is true. This method 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();
}

See also: desktopSettingsAware()

void QApplication::setDoubleClickInterval ( int interval )

static

Sets the value of the property to interval.

void QApplication::setEffectEnabled	(	Qt::UIEffect	effect,
		bool	enable = `true`
	)

static

Enables the UI effect if enable is true, otherwise the effect will not be used. All effects are disabled on screens running at less than 16-bit color depth.

See also: isEffectEnabled(), Qt::UIEffect, setDesktopSettingsAware()

void QApplication::setFallbackSessionManagementEnabled ( bool enable )

static

Sets the value of the property to enable.

void QApplication::setFont	(	const QFont &	font,
		const QString &	className = `QString()`
	)

static

Changes the default application font to font. If className is passed, the change applies only to classes which inherit from className as defined by QObject::inherits().

On application start-up, the default font depends on the window system. It can vary depending on both the window system version and the locale. This method lets you override the default font, which may not be the best approach. For example, some locales need extra large fonts to support their special characters.

Warning: Do not use this method in conjunction with Style Sheets. The font of an application can be customized using the font style sheet property. To set a bold font for all QPushButtons, set the application style sheet as "QPushButton { font: bold }"

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

void QApplication::setGlobalStrut ( const QSize & size )

static

Sets the value of the property to size.

void QApplication::setKeyboardInputInterval ( int interval )

static

Sets the value of the property to interval.

void QApplication::setLayoutDirection ( Qt::LayoutDirection direction )

static

Sets the value of the property to direction.

void QApplication::setOverrideCursor ( const QCursor & cursor )

static

Sets the application overrideCursor property to cursor. The override is intended to show the user the application is in a special state, for example during an operation which might take some time. The override cursor will be displayed in all the application widgets until restoreOverrideCursor() or until this method is called again with a different cursor.

Every call to this method must eventually be followed by a corresponding call to restoreOverrideCursor(), otherwise the stack will never be emptied.

Application cursors are stored on an internal stack. Calling setOverrideCursor() pushes the cursor onto the stack and restoreOverrideCursor() pops the active cursor off the stack. The changeOverrideCursor() method changes the currently active application overrideCursor property.

QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
calculateHugeMandelbrot();
 
QApplication::restoreOverrideCursor();

See also: changeOverrideCursor(), overrideCursor(), restoreOverrideCursor(), QWidget::setCursor()

void QApplication::setPalette	(	const QPalette &	palette,
		const QString &	className = `QString()`
	)

static

Changes the default application palette property to palette. If className is passed, the change applies only to widgets which inherit from className as reported by QObject::inherits(). If className is empty the change affects all widgets, thus overriding any previously set class specific palettes.

The palette may be changed according to the current GUI style in QStyle::polish(). Some styles do not use the palette for drawing all widgets. For instance, if the style makes use of native theme engines the palette may be ignored for some widgets. This is the case for the Windows Vista and Mac OS X styles.

Warning: Do not use this method in conjunction with Style Sheets. When using style sheets the palette of a widget can be customized using the color, background-color, selection-color, selection-background-color, or alternate-background-color.

See also: palette(), QStyle::polish(), QWidget::setPalette()

void QApplication::setQuitOnLastWindowClosed ( bool quit )

static

Sets the value of the property to quit.

void QApplication::setStartDragDistance ( int distance )

static

Sets the value of the property to distance.

void QApplication::setStartDragTime ( int time )

static

Sets the value of the property to time.

QStyle * QApplication::setStyle ( const QString & style )

static

This method retrieves a QStyle for the specified style from the QStyleFactory. The style string must be one of the QStyleFactory::keys(), like "windows", "windowsxp", "windowsvista", "macintosh", "gtk", or "fusion". Style names are case insensitive.

Returns a nullptr if an unknown style is passed, otherwise a pointer to the QStyle is returned.

Warning: To ensure the application style is set correctly, it is best to call this method before the QApplication constructor.

void QApplication::setStyle ( QStyle * style )

static

Sets the application GUI style to style. Ownership of the style object is transferred to QApplication, so QApplication will delete the style object on application exit or when a new style is set and the old style is still the parent of the application object.

QApplication::setStyle(new QWindowsStyle);

When switching application styles, the color palette is set back to the initial colors or the system defaults. This is necessary since certain styles have to adapt the color palette to be fully style-guide compliant.

Setting the style before a palette has been set or before creating QApplication, will cause the application to use QStyle::standardPalette().

Warning: CopperSpice style sheets are currently not supported for custom QStyle subclasses.

See also: style(), QStyle, setPalette(), desktopSettingsAware()

void QApplication::setStyleSheet ( const QString & sheet )

slot

Sets the value of the property to sheet.

void QApplication::setWheelScrollLines ( int lines )

static

Sets the value of the property to lines.

void QApplication::setWindowIcon ( const QIcon & icon )

static

Sets the value of the property to icon.

int QApplication::startDragDistance ( )

static

Returns the value of the property startDragDistance.

int QApplication::startDragTime ( )

static

Returns the value of the property startDragTime.

QStyle * QApplication::style ( )

static

Returns a pointer to the current application style.

See also: setStyle(), QStyle

QStyleHints * QApplication::styleHints ( )

static

Returns the application style hints. The style hints encapsulate a set of platform dependent properties such as double click intervals and full width selection.

QString QApplication::styleSheet ( ) const

Returns the value of the property.

void QApplication::sync ( )

static

Used to synchronize the CopperSpice state with the Window Systems state.

This method will first empty events by calling QCoreApplication::processEvents(), then the platform plugin will sync up with the window system, and finally events will be delivered by another call to QCoreApplication::processEvents();

QWidget * QApplication::topLevelWidgetAt ( const QPoint & pos )

static

Returns the top level widget at the given point pos, returns a nullptr if there is no such widget.

QWidgetList QApplication::topLevelWidgets ( )

static

Returns a list of the top level widgets (windows) in the application.

void showAllHiddenTopLevelWidgets() {
   for (QWidget *widget : QApplication::topLevelWidgets()) {
      if (widget->isHidden()) {
          widget->show();
      }
   }
}

Note: Some of the top level widgets may be hidden.

See also: allWidgets(), QWidget::isWindow(), QWidget::isHidden()

QWindow * QApplication::topLevelWindowAt ( const QPoint & pos )

static

Returns the top level window at the position of pos if a window exists.

QWindowList QApplication::topLevelWindows ( )

static

Returns a list of the top level windows in the application.

See also: allWindows()

int QApplication::wheelScrollLines ( )

static

Returns the value of the property wheelScrollLines.

QWidget * QApplication::widgetAt ( const QPoint & point )

static

Returns the widget at global screen position point. Returns nullptr if there is no widget in that location. This method can be slow.

See also: QCursor::pos(), QWidget::grabMouse(), QWidget::grabKeyboard()

QWidget * QApplication::widgetAt	(	int	x,
		int	y
	)

inlinestatic

Returns the widget at global screen position (x, y), or nullptr if there is no widget there.

QIcon QApplication::windowIcon ( )

static

Returns the value of the property windowIcon.

Property Documentation

QApplication::applicationDisplayName

This property holds the user-visible name of this application

This name is shown to the user, for instance in window titles. It can be translated, if necessary. If not set, the application display name defaults to the application name.

Properties	Class Methods
read	applicationDisplayName
write	setApplicationDisplayName

QApplication::autoSipEnabled

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 default is platform dependent.

Properties	Class Methods
read	autoSipEnabled
write	setAutoSipEnabled

QApplication::cursorFlashTime

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.

Properties	Class Methods
read	cursorFlashTime
write	setCursorFlashTime

QApplication::doubleClickInterval

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 setting this property sets the double click interval for all applications.

Properties	Class Methods
read	doubleClickInterval
write	setDoubleClickInterval

QApplication::globalStrut

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.

QSize MyWidget::sizeHint() const {
   return QSize(80, 25).expandedTo(QApplication::globalStrut());
}

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

Properties	Class Methods
read	globalStrut
write	setGlobalStrut

QApplication::keyboardInputInterval

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.

Properties	Class Methods
read	keyboardInputInterval
write	setKeyboardInputInterval

QApplication::layoutDirection

This property holds the default layout direction for this application. On system start-up the default layout direction depends on the application language.

See also: QWidget::layoutDirection, isLeftToRight(), isRightToLeft()

Properties	Class Methods
read	layoutDirection
write	setLayoutDirection

QApplication::platformName

This property holds the name of the underlying platform plugin. The following platform plugin names are supported.

cocoa: platform plugin for Mac OS X
windows: platform plugin for Windows desktop
xcb: platform plugin used on Linux platforms (X11)
wayland: platform plugin used on Linux platforms (Wayland)

Properties	Class Methods
read	platformName
stored	true

QApplication::primaryScreen

This property holds the primary (or default) screen of the application. This will be the screen where a QWindow is initially shown, unless otherwise specified.

Properties	Class Methods
read	primaryScreen
notify	primaryScreenChanged
stored	true

QApplication::quitOnLastWindowClosed

This property holds whether the application implicitly quits when the last window is closed. The default is true.

If this property is true, the application quits when the last visible top level window with the Qt::WA_QuitOnClose attribute set is closed. By default this attribute is set for all widgets except for sub-windows. Refer to Qt::WindowType for a detailed list of Qt::Window objects.

See also: quit(), QWidget::close()

Properties	Class Methods
read	quitOnLastWindowClosed
write	setQuitOnLastWindowClosed

QApplication::startDragDistance

The value of this property is the minimum distance required to start a drag and drop operation. The default value is 4 pixels.

In the following example, the mouse position of the mouse click will be stored in startPos and the current position is currentPos. The drag operation is started if the mouse has moved far enough from startPos.

if ((startPos - currentPos).manhattanLength() >= QApplication::startDragDistance()) {
   startTheDrag();
}

See also: startDragTime(), QPoint::manhattanLength(), Drag and Drop

Properties	Class Methods
read	startDragDistance
write	setStartDragDistance

QApplication::startDragTime

This property holds the time in milliseconds that a mouse button must be held down before a drag and drop operation will begin. The default value is 500 ms.

If you support drag and drop in your application, and want to start a drag and drop operation after the user has held down a mouse button for a certain amount of time, you should use this property's value as the delay.

See also: startDragDistance(), Drag and Drop

Properties	Class Methods
read	startDragTime
write	setStartDragTime

QApplication::styleSheet

This property holds the application style sheet. By default this property returns an empty string unless the user specifies the -stylesheet option on the command line when running the application.

See also: QWidget::setStyle(), Style Sheets

Properties	Class Methods
read	styleSheet
write	setStyleSheet

QApplication::wheelScrollLines

This property holds the number of lines to scroll a widget when the mouse wheel is rotated. By default this property has a value of 3.

If the value exceeds the widget's number of visible lines, the widget should interpret the scroll operation as a single page up or page down. If the widget is an item view class, then the result of scrolling one line depends on the setting of the widget's scroll mode. Scroll one line can mean scroll one item or scroll one pixel.

Properties	Class Methods
read	wheelScrollLines
write	setWheelScrollLines

QApplication::windowIcon

This property holds the default windowIcon.

See also: QWidget::setWindowIcon(), Setting the Application Icon

Properties	Class Methods
read	windowIcon
write	setWindowIcon

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Detailed Description

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