A splash screen is a widget that is usually displayed when an application is being started. Splash screens are often used for applications that have long start up times (e.g. database or networking applications that take time to establish connections) to provide the user with feedback that the application is loading.
The splash screen appears in the center of the screen. It may be useful to add the
WindowStaysOnTopHint to the splash widget’s window flags if you want to keep it above all the other windows on the desktop.
Some X11 window managers do not support the “stays on top” flag. A solution is to set up a timer that periodically calls
raise() on the splash screen to simulate the “stays on top” effect.
The most common usage is to show a splash screen before the main widget is displayed on the screen. This is illustrated in the following code snippet in which a splash screen is displayed and some initialization tasks are performed before the application’s main window is shown:
def main(): app = QApplication(sys.argv) pixmap = QPixmap(":/splash.png") splash = QSplashScreen(pixmap) splash.show() app.processEvents() ... window = QMainWindow() window.show() splash.finish(&window) return app.exec_()
The user can hide the splash screen by clicking on it with the mouse. Since the splash screen is typically displayed before the event loop has started running, it is necessary to periodically call
processEvents() to receive the mouse clicks.
It is sometimes useful to update the splash screen with messages, for example, announcing connections established or modules loaded as the application starts up:
pixmap = QPixmap(":/splash.png") splash = QSplashScreen(pixmap) splash.show() ... # Loading some items splash.showMessage("Loaded modules") qApp.processEvents() ... # Establishing connections splash.showMessage("Established connections") qApp.processEvents()
QSplashScreen supports this with the
showMessage() function. If you wish to do your own drawing you can get a pointer to the pixmap used in the splash screen with
pixmap() . Alternatively, you can subclass
QSplashScreen and reimplement
In case of having multiple screens, it is also possible to show the splash screen on a different screen than the primary one. For example:
QScreen *screen = QGuiApplication::screens().at(1); QPixmap pixmap(":/splash.png"); QSplashScreen splash(screen, pixmap); splash.show();
QSplashScreen(screen[, pixmap=QPixmap()[, f=Qt.WindowFlags()]])¶
This is an overloaded function.
This function allows you to specify the screen for your splashscreen. The typical use for this constructor is if you have multiple screens and prefer to have the splash screen on a different screen than your primary one. In that case pass the proper
Construct a splash screen that will display the
There should be no need to set the widget flags,
f, except perhaps
Removes the message being displayed on the splash screen
Draw the contents of the splash screen using painter
painter. The default implementation draws the message passed by
showMessage() . Reimplement this function if you want to do your own drawing on the splash screen.
Makes the splash screen wait until the widget
mainWin is displayed before calling
close() on itself.
- Return type
Returns the message that is currently displayed on the splash screen.
message – str
Returns the pixmap that is used in the splash screen. The image does not have any of the text drawn by
Sets the pixmap that will be used as the splash screen’s image to
showMessage(message[, alignment=Qt.AlignLeft[, color=Qt.black]])¶
message – str
alignment – int
message text onto the splash screen with color
color and aligns the text according to the flags in
alignment. This function calls
repaint() to make sure the splash screen is repainted immediately. As a result the message is kept up to date with what your application is doing (e.g. loading files).
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