This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks. QDesktopWidget has various functions for obtaining useful geometries upon the desktop, such as screenGeometry() and availableGeometry(). 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. Returns the desktop widget (also called the root window). This property may hold a negative value, for instance if cursor blinking is disabled. The list is empty ( isEmpty() ) if there are no widgets. Returns a list of all the widgets in the application. not have hide() called on it, but be visible in some sort of way) in order for this to work. On X11, this will cause the window to be marked as “demands attention”, the window must not be hidden (i.e. If msec is zero, the flashing will stop and the taskbar entry will turn a different color (currently orange). On Windows, this causes the window’s taskbar entry to flash for a time. On macOS, this works more at the application level and will cause the application icon to bounce in the dock. If msec is zero (the default), then the alert is shown indefinitely until the window becomes active again.Ĭurrently this function does nothing on Qt for Embedded Linux. alert ( widget ) ¶ ParametersĬauses an alert to be shown for widget if the window is not the active window. SetActiveWindow() setFocus() hasFocus() focusWidget() static. This function returns the active modal widget at the top of the stack. A modal widget must be closed before the user can continue with other parts of the program. activeModalWidget ( ) ¶ Return typeĪ modal widget is a special top-level widget which is a subclass of QDialog that specifies the modal parameter of the constructor as true. This function is a convenience slot for aboutQt(). This is useful for inclusion in the Help menu of an application, as shown in the Menus example. The message includes the version number of Qt being used by the application. aboutQt ( ) ¶ĭisplays a simple message box about Qt. The right choice for applications that use thousands of colors
The same as for X11 allocates colors to a palette on demand under Windows (arg_1) ParametersĪrg_1 – list of strings. ĬloseAllWindows(), startingUp(), closingDown(). OverrideCursor(), setOverrideCursor(), restoreOverrideCursor(). ĪllWidgets(), topLevelWidgets(), desktop(), activePopupWidget(), activeModalWidget(), clipboard(), focusWidget(), activeWindow(), widgetAt(). InstallTranslator(), removeTranslator() translate(). sendEvent(), postEvent(), sendPostedEvents(), removePostedEvents(), hasPendingEvents(), notify(). Įxec(), processEvents(), exit(), quit(). Hence, it is usually a good idea to create it before any interpretation or modification of argv is done in the application itself.ĭesktopSettingsAware(), setDesktopSettingsAware(), cursorFlashTime(), setCursorFlashTime(), doubleClickInterval(), setDoubleClickInterval(), setKeyboardInputInterval(), wheelScrollLines(), setWheelScrollLines(), palette(), setPalette(), font(), setFont(), fontMetrics(). QApplication also deals with common command line arguments. Since the QApplication object does so much initialization, it must be created before any other objects related to the user interface are created. It manages the application’s mouse cursor handling, see setOverrideCursor() You can ask which widget is at a certain position using widgetAt(), get a list of topLevelWidgets() and closeAllWindows(), etc. It knows about the application’s windows. It provides some magical objects like the desktop() and the clipboard(). It provides localization of strings that are visible to the user via translate(). This can be changed at runtime with setStyle().
It defines the application’s look and feel, which is encapsulated in a QStyle object. See the constructor documentation below for more details. It parses common command line arguments and sets its internal state accordingly. By using sendEvent() and postEvent() you can send your own events to widgets. It performs event handling, meaning that it receives events from the underlying window system and dispatches them to the relevant widgets. It keeps track of these properties in case the user changes the desktop globally, for example through some kind of control panel.
It initializes the application with the user’s desktop settings such as palette(), font() and doubleClickInterval().
QApplication ‘s main areas of responsibility are: The QApplication object is accessible through the instance() function that returns a pointer equivalent to the global qApp pointer. argv ) if useGUI else QCoreApplication ( sys. Def setEffectEnabled (arg_1)ĭef setPalette (arg_1)ĭef main (): useGUI = not '-no-gui' in sys.