QSplashScreen¶
The
QSplashScreen
widget provides a splash screen that can be shown during application startup. More…
Synopsis¶
Virtual functions¶
def
drawContents
(painter)
Slots¶
def
clearMessage
()def
showMessage
(message[, alignment=Qt.AlignLeft[, color=Qt.black]])
Signals¶
def
messageChanged
(message)
Detailed Description¶
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 theshowMessage()
function. If you wish to do your own drawing you can get a pointer to the pixmap used in the splash screen withpixmap()
. Alternatively, you can subclassQSplashScreen
and reimplementdrawContents()
.
-
class
QSplashScreen
(parent[, pixmap=QPixmap()[, f=Qt.WindowFlags()]])¶ QSplashScreen([pixmap=QPixmap()[, f=Qt.WindowFlags()]])
- param f
WindowFlags
- param parent
- param pixmap
QPixmap
This is an overloaded function.
This function allows you to specify a parent for your splashscreen. The typical use for this constructor is if you have a multiple screens and prefer to have the splash screen on a different screen than your primary one. In that case pass the proper desktop() as the
parent
.Construct a splash screen that will display the
pixmap
.There should be no need to set the widget flags,
f
, except perhapsWindowStaysOnTopHint
.
-
PySide2.QtWidgets.QSplashScreen.
clearMessage
()¶ Removes the message being displayed on the splash screen
See also
-
PySide2.QtWidgets.QSplashScreen.
drawContents
(painter)¶ - Parameters
painter –
QPainter
Draw the contents of the splash screen using painter
painter
. The default implementation draws the message passed byshowMessage()
. Reimplement this function if you want to do your own drawing on the splash screen.
-
PySide2.QtWidgets.QSplashScreen.
finish
(w)¶ - Parameters
w –
QWidget
Makes the splash screen wait until the widget
mainWin
is displayed before callingclose()
on itself.
-
PySide2.QtWidgets.QSplashScreen.
message
()¶ - Return type
unicode
Returns the message that is currently displayed on the splash screen.
See also
-
PySide2.QtWidgets.QSplashScreen.
messageChanged
(message)¶ - Parameters
message – unicode
-
PySide2.QtWidgets.QSplashScreen.
pixmap
()¶ - Return type
QPixmap
Returns the pixmap that is used in the splash screen. The image does not have any of the text drawn by
showMessage()
calls.See also
-
PySide2.QtWidgets.QSplashScreen.
setPixmap
(pixmap)¶ - Parameters
pixmap –
QPixmap
Sets the pixmap that will be used as the splash screen’s image to
pixmap
.See also
-
PySide2.QtWidgets.QSplashScreen.
showMessage
(message[, alignment=Qt.AlignLeft[, color=Qt.black]])¶ - Parameters
message – unicode
alignment –
int
color –
QColor
Draws the
message
text onto the splash screen with colorcolor
and aligns the text according to the flags inalignment
. This function callsrepaint()
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).See also
Alignment
clearMessage()
message()
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