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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.gui.QWidget
com.trolltech.qt.gui.QSplashScreen
public class QSplashScreen
The QSplashScreen widget provides a splash screen that can be shown during application startup.
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 Qt::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:
int main(int argc, char *argv[]) { QApplication app(argc, argv); QPixmap pixmap(":/splash.png"); QSplashScreen splash(pixmap); splash.show(); app.processEvents(); ... QMainWindow window; 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 QApplication::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:
QPixmap pixmap(":/splash.png"); QSplashScreen *splash = new 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 drawContents.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget |
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QWidget.RenderFlag, QWidget.RenderFlags |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Field Summary | |
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QSignalEmitter.Signal1<java.lang.String> |
messageChanged
This signal is emitted when the message on the splash screen changes. |
Fields inherited from class com.trolltech.qt.gui.QWidget |
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customContextMenuRequested |
Constructor Summary | |
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QSplashScreen()
Equivalent to QSplashScreen(QPixmap(), 0). |
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QSplashScreen(QPixmap pixmap)
Equivalent to QSplashScreen(pixmap, 0). |
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QSplashScreen(QPixmap pixmap,
Qt.WindowFlags f)
Construct a splash screen that will display the pixmap. |
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QSplashScreen(QWidget parent)
Equivalent to QSplashScreen(parent, QPixmap(), 0). |
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QSplashScreen(QWidget parent,
QPixmap pixmap)
Equivalent to QSplashScreen(parent, pixmap, 0). |
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QSplashScreen(QWidget parent,
QPixmap pixmap,
Qt.WindowFlags f)
This function allows you to specify a parent for your splashscreen. |
Method Summary | |
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void |
clearMessage()
Removes the message being displayed on the splash screen |
protected void |
drawContents(QPainter painter)
Draw the contents of the splash screen using painter painter. |
boolean |
event(QEvent e)
This function is reimplemented for internal reasons. |
void |
finish(QWidget w)
Makes the splash screen wait until the widget w is displayed before calling close on itself. |
static QSplashScreen |
fromNativePointer(QNativePointer nativePointer)
This function returns the QSplashScreen instance pointed to by nativePointer |
protected void |
mousePressEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
QPixmap |
pixmap()
Returns the pixmap that is used in the splash screen. |
void |
setPixmap(QPixmap pixmap)
Sets the pixmap that will be used as the splash screen's image to pixmap. |
void |
showMessage(java.lang.String message)
Equivalent to showMessage(message, Qt::AlignLeft, Qt::black). |
void |
showMessage(java.lang.String message,
int alignment)
Equivalent to showMessage(message, alignment, Qt::black). |
void |
showMessage(java.lang.String message,
int alignment,
QColor color)
Draws the message text onto the splash screen with color color and aligns the text according to the flags in alignment. |
Methods inherited from class com.trolltech.qt.core.QObject |
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blockSignals, childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, property, removeEventFilter, setObjectName, setParent, setProperty, signalsBlocked, startTimer, thread, timerEvent |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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disconnect, disconnect, signalSender |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Field Detail |
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public final QSignalEmitter.Signal1<java.lang.String> messageChanged
This signal is emitted when the message on the splash screen changes. message is the new message and is a null-string when the message has been removed.
Constructor Detail |
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public QSplashScreen(QPixmap pixmap)
Equivalent to QSplashScreen(pixmap, 0).
public QSplashScreen()
Equivalent to QSplashScreen(QPixmap(), 0).
public QSplashScreen(QPixmap pixmap, Qt.WindowFlags f)
Construct a splash screen that will display the pixmap.
There should be no need to set the widget flags, f, except perhaps Qt::WindowStaysOnTopHint.
public QSplashScreen(QWidget parent, QPixmap pixmap)
Equivalent to QSplashScreen(parent, pixmap, 0).
public QSplashScreen(QWidget parent)
Equivalent to QSplashScreen(parent, QPixmap(), 0).
public QSplashScreen(QWidget parent, QPixmap pixmap, Qt.WindowFlags f)
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.
Method Detail |
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public final void clearMessage()
Removes the message being displayed on the splash screen
public final void finish(QWidget w)
Makes the splash screen wait until the widget w is displayed before calling close on itself.
public final QPixmap pixmap()
Returns the pixmap that is used in the splash screen. The image does not have any of the text drawn by showMessage calls.
public final void setPixmap(QPixmap pixmap)
Sets the pixmap that will be used as the splash screen's image to pixmap.
public final void showMessage(java.lang.String message, int alignment)
Equivalent to showMessage(message, alignment, Qt::black).
public final void showMessage(java.lang.String message)
Equivalent to showMessage(message, Qt::AlignLeft, Qt::black).
public final void showMessage(java.lang.String message, int alignment, QColor color)
Draws the message text onto the splash screen with color color and aligns the text according to the flags in alignment.
Qt::Alignment
,
clearMessageprotected void drawContents(QPainter painter)
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.
public boolean event(QEvent e)
This function is reimplemented for internal reasons.
event
in class QWidget
protected void mousePressEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mousePressEvent
in class QWidget
Example
public static QSplashScreen fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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