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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
public class QApplication
The QApplication class manages the GUI application's control flow and main settings. It contains the main event loop, where all events from the window system and other sources are processed and dispatched. It also handles the application's initialization and finalization, and provides session management. It also handles most system-wide and application-wide settings.
For any GUI application that uses Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any time. For non-GUI Qt applications, use QCoreApplication instead, which doesn't depend on the QtGui library.
The QApplication object is accessible through the instance() function which return a pointer equivalent to the global qApp pointer.
QApplication's main areas of responsibility are:
palette(), font() and doubleClickInterval(). It keeps track of these properties in case the user changes the desktop globally, for example through some kind of control panel.sendEvent() and postEvent() you can send your own events to widgets.QStyle object. This can be changed at runtime with setStyle().setColorSpec() for details.translate().desktop() and the clipboard().widgetAt(), get a list of topLevelWidgets() and closeAllWindows(), etc.setOverrideCursor()syncX().isSessionRestored(), sessionId() and commitData() and saveState() for details.Since it also deals with common command line arguments, it is usually a good idea to create it before any interpretation or modification of argv is done in the application itself.
QCoreApplication, QAbstractEventDispatcher, QEventLoop, and QSettings.
| Nested Class Summary | |
|---|---|
static class |
QApplication.ColorSpec
See setColorSpec() for full details. |
static class |
QApplication.Type
|
| Nested classes/interfaces inherited from class com.trolltech.qt.core.QCoreApplication |
|---|
QCoreApplication.Encoding |
| Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
|---|
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
| Field Summary | |
|---|---|
QSignalEmitter.Signal1 |
commitDataRequest
This signal takes 1 generic argument(s). |
QSignalEmitter.Signal2 |
focusChanged
This signal takes 2 generic argument(s). |
QSignalEmitter.Signal0 |
fontDatabaseChanged
This signal is emitted when application fonts are loaded or removed. |
QSignalEmitter.Signal0 |
lastWindowClosed
This signal is emitted from QApplication.:exec() when the last visible primary window (i. |
QSignalEmitter.Signal1 |
saveStateRequest
This signal takes 1 generic argument(s). |
| Fields inherited from class com.trolltech.qt.core.QCoreApplication |
|---|
aboutToQuit, m_instance, unixSignal |
| Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
|---|
currentSender |
| Constructor Summary | |
|---|---|
QApplication(java.lang.String[] args)
Creates a QApplication with the specified command line arguments. |
|
| Method Summary | |
|---|---|
static void |
aboutQt()
Displays a simple message box about Qt. |
static void |
aboutQtJambi()
Displays a simple message box about Qt Jambi. |
static QWidget |
activeModalWidget()
Returns the active modal widget. |
static QWidget |
activePopupWidget()
Returns the active popup widget. |
static QWidget |
activeWindow()
Returns the application top-level window that has the keyboard input focus, or 0 if no application window has the focus. |
static void |
alert(QWidget widget)
Causes an alert to be shown for widget if the window is not the active window. |
static void |
alert(QWidget widget,
int duration)
Causes an alert to be shown for widget if the window is not the active window. |
static java.util.List |
allWidgets()
Returns a list of all the widgets in the application. |
static void |
beep()
Sounds the bell, using the default volume and sound. |
static void |
changeOverrideCursor(QCursor arg__1)
Changes the currently active application override cursor to cursor. |
static QClipboard |
clipboard()
Returns a pointer to the application global clipboard. |
static void |
closeAllWindows()
Closes all top-level windows. |
static int |
colorSpec()
Returns the color specification. |
void |
commitData(QSessionManager sm)
This function deals with session management. |
static int |
cursorFlashTime()
This property holds the text cursor's flash (blink) time in milliseconds. |
static QDesktopWidget |
desktop()
Returns the desktop widget (also called the root window). |
static boolean |
desktopSettingsAware()
Returns true if Qt is set to use the system's standard colors, fonts, etc. |
static int |
doubleClickInterval()
This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks. |
static QWidget |
focusWidget()
Returns the application widget that has the keyboard input focus, or 0 if no widget in this application has the focus. |
static QFont |
font()
Returns the default application font. |
static QFont |
font(QWidget arg__1)
This is an overloaded member function, provided for convenience. |
static QFontMetrics |
fontMetrics()
Returns display (screen) font metrics for the application font. |
static QSize |
globalStrut()
This property holds the minimum size that any GUI element that the user can interact with should have. |
QInputContext |
inputContext()
Returns the QInputContext instance used by the application. |
static QApplication |
instance()
Returns the unique QApplication instance. |
static boolean |
isEffectEnabled(Qt.UIEffect arg__1)
Returns true if effect is enabled; otherwise returns false. |
static boolean |
isLeftToRight()
Returns true if the application's layout direction is Qt::LeftToRight ; otherwise returns false. |
static boolean |
isRightToLeft()
Returns true if the application's layout direction is Qt::RightToLeft ; otherwise returns false. |
boolean |
isSessionRestored()
Returns true if the application has been restored from an earlier session; otherwise returns false. |
static Qt.LayoutDirection |
keyboardInputDirection()
Returns the current keyboard input direction. |
static int |
keyboardInputInterval()
This property holds the time limit in milliseconds that distinguishes a key press from two consecutive key presses. |
static QLocale |
keyboardInputLocale()
Returns the current keyboard input locale. |
static Qt.KeyboardModifiers |
keyboardModifiers()
Returns the current state of the modifier keys on the keyboard. |
static Qt.LayoutDirection |
layoutDirection()
This property holds the default layout direction for this application. |
static Qt.MouseButtons |
mouseButtons()
Returns the current state of the buttons on the mouse. |
static QCursor |
overrideCursor()
Returns the active application override cursor. |
static QPalette |
palette()
Returns the application palette. |
static QPalette |
palette(QWidget arg__1)
This is an overloaded member function, provided for convenience. |
static boolean |
quitOnLastWindowClosed()
This property holds whether the application implicitly quits when the last window is closed. |
static void |
restoreOverrideCursor()
Undoes the last setOverrideCursor(). |
void |
saveState(QSessionManager sm)
This function deals with session management. |
java.lang.String |
sessionId()
Returns the current session's identifier. |
java.lang.String |
sessionKey()
Returns the session key in the current session. |
static void |
setActiveWindow(QWidget act)
Sets the active window to the active widget in response to a system event. |
static void |
setColorSpec(int arg__1)
Sets the color specification for the application to spec. |
static void |
setCursorFlashTime(int arg__1)
This property holds the text cursor's flash (blink) time in milliseconds. |
static void |
setDesktopSettingsAware(boolean arg__1)
Sets whether Qt should use the system's standard colors, fonts, etc. |
static void |
setDoubleClickInterval(int arg__1)
This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks. |
static void |
setEffectEnabled(Qt.UIEffect arg__1)
Enables the UI effect effect if enable is true, otherwise the effect will not be used. |
static void |
setEffectEnabled(Qt.UIEffect arg__1,
boolean enable)
Enables the UI effect effect if enable is true, otherwise the effect will not be used. |
static void |
setFont(QFont font)
Changes the default application font to font. |
static void |
setGlobalStrut(QSize arg__1)
This property holds the minimum size that any GUI element that the user can interact with should have. |
void |
setInputContext(QInputContext arg__1)
This function replaces the QInputContext instance used by the application with inputContext. |
static void |
setKeyboardInputInterval(int arg__1)
This property holds the time limit in milliseconds that distinguishes a key press from two consecutive key presses. |
static void |
setLayoutDirection(Qt.LayoutDirection direction)
This property holds the default layout direction for this application. |
static void |
setOverrideCursor(QCursor arg__1)
Sets the application override cursor to cursor. |
static void |
setPalette(QPalette palette)
Changes the default application palette to palette. |
static void |
setQuitOnLastWindowClosed(boolean quit)
This property holds whether the application implicitly quits when the last window is closed. |
static void |
setStartDragDistance(int l)
If you support drag and drop in your application, and want to start a drag and drop operation after the user has moved the cursor a certain distance with a button held down, you should use this property's value as the minimum distance required. |
static void |
setStartDragTime(int ms)
This property holds the time in milliseconds that a mouse button must be held down before a drag and drop operation will begin. |
static void |
setStyle(QStyle arg__1)
Sets the application's GUI style to style. |
static QStyle |
setStyle(java.lang.String arg__1)
This is an overloaded member function, provided for convenience. |
void |
setStyleSheet(java.lang.String sheet)
This property holds the application style sheet. |
static void |
setWheelScrollLines(int arg__1)
This property holds the number of lines to scroll a widget, when the mouse wheel is rotated. |
static void |
setWindowIcon(QIcon icon)
This property holds the default window icon. |
static int |
startDragDistance()
If you support drag and drop in your application, and want to start a drag and drop operation after the user has moved the cursor a certain distance with a button held down, you should use this property's value as the minimum distance required. |
static int |
startDragTime()
This property holds the time in milliseconds that a mouse button must be held down before a drag and drop operation will begin. |
static QStyle |
style()
Returns the application's style object. |
java.lang.String |
styleSheet()
This property holds the application style sheet. |
static void |
syncX()
Synchronizes with the X server in the X11 implementation. |
static QWidget |
topLevelAt(int x,
int y)
This is an overloaded member function, provided for convenience. |
static QWidget |
topLevelAt(QPoint p)
Returns the top-level widget at the given point; returns 0 if there is no such widget. |
static java.util.List |
topLevelWidgets()
Returns a list of the top-level widgets (windows) in the application. |
static QApplication.Type |
type()
Returns the type of application ( Tty , GuiClient , or GuiServer ). |
static int |
wheelScrollLines()
This property holds the number of lines to scroll a widget, when the mouse wheel is rotated. |
static QWidget |
widgetAt(int x,
int y)
This is an overloaded member function, provided for convenience. |
static QWidget |
widgetAt(QPoint p)
Returns the widget at global screen position point, or 0 if there is no Qt widget there. |
static QIcon |
windowIcon()
This property holds the default window icon. |
| Methods inherited from class com.trolltech.qt.core.QObject |
|---|
childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty |
| Methods inherited from class com.trolltech.qt.QtJambiObject |
|---|
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
| Methods inherited from class com.trolltech.qt.QSignalEmitter |
|---|
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
| Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
|---|
__qt_signalInitialization |
| Methods inherited from class java.lang.Object |
|---|
clone, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Methods inherited from interface com.trolltech.qt.QtJambiInterface |
|---|
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
| Field Detail |
|---|
public final QSignalEmitter.Signal1 commitDataRequest
This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QSessionManager(named: manager)>:
This signal deals with session management. It is emitted when the QSessionManager wants the application to commit all its data.
Usually this means saving all open files, after getting permission from the user. Furthermore you may want to provide a means by which the user can cancel the shutdown.
Note that you should not exit the application when called. Instead, the session manager may or may not do this afterwards, depending on the context.
Warning: Within this signal, no user interaction is possible, unless you ask the manager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details and example usage.
Note: You should use Qt::DirectConnection when connecting to this signal.
isSessionRestored(), sessionId(), saveState(), and Session Management.
public final QSignalEmitter.Signal2 focusChanged
This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QWidget(named: old), com.trolltech.qt.gui.QWidget(named: now)>:
This signal is emitted when the widget that has keyboard focus changed from old to now, i. . because the user pressed the tab-key, clicked into a widget or changed the active window. Note that both old and now can be the null-pointer.
The signal is emitted after both widget have been notified about the change through QFocusEvent.
QWidget::setFocus(), QWidget::clearFocus(), and Qt::FocusReason .
public final QSignalEmitter.Signal0 fontDatabaseChanged
QFontDatabase::addApplicationFont(), QFontDatabase::addApplicationFontFromData(), QFontDatabase::removeAllApplicationFonts(), and QFontDatabase::removeApplicationFont().
public final QSignalEmitter.Signal0 lastWindowClosed
Qt::WA_QuitOnClose attribute set is closed. By default,
quitOnLastWindowClosed to false. QWidget::close().
public final QSignalEmitter.Signal1 saveStateRequest
This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QSessionManager(named: manager)>:
This signal deals with session management. It is invoked 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.
Note that you should never exit the application within this signal. Instead, the session manager may or may not do this afterwards, depending on the context. Futhermore, 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's restart policy.
Warning: Within this function, no user interaction is possible, unless you ask the manager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details.
Note:: You should use Qt::DirectConnection when connecting to this signal.
isSessionRestored(), sessionId(), commitData(), and Session Management.
| Constructor Detail |
|---|
public QApplication(java.lang.String[] args)
| Method Detail |
|---|
public final QInputContext inputContext()
QInputContext instance used by the application. setInputContext().
public final boolean isSessionRestored()
sessionId(), commitData(), and saveState().
public final java.lang.String sessionId()
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.
isSessionRestored(), sessionKey(), commitData(), and saveState().
public final java.lang.String sessionKey()
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 commitData() or saveState().
isSessionRestored(), sessionId(), commitData(), and saveState().
public final void setInputContext(QInputContext arg__1)
QInputContext instance used by the application with inputContext. inputContext().
public final void setStyleSheet(java.lang.String sheet)
QWidget::setStyle(), and Qt Style Sheets.
public final java.lang.String styleSheet()
QWidget::setStyle(), and Qt Style Sheets.
public void commitData(QSessionManager sm)
QSessionManager wants the application to commit all its data. Usually this means saving all open files, after getting permission from the user. Furthermore you may want to provide a means by which the user can cancel the shutdown.
Note that you should not exit the application within this function. Instead, the session manager may or may not do this afterwards, depending on the context.
Warning: Within this function, no user interaction is possible, unless you ask the manager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details and example usage.
The default implementation requests interaction and sends a close event to all visible top-level widgets. If any event was rejected, the shutdown is canceled.
isSessionRestored(), sessionId(), saveState(), and Session Management.
public void saveState(QSessionManager sm)
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.
Note that you should never exit the application within this function. Instead, the session manager may or may not do this afterwards, depending on the context. Futhermore, 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's restart policy.
Warning: Within this function, no user interaction is possible, unless you ask the manager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details.
isSessionRestored(), sessionId(), commitData(), and Session Management.
public static void aboutQt()
This is useful for inclusion in the Help menu of an application, as shown in the Menus example.
This function is a convenience slot for QMessageBox::aboutQt().
public static QWidget activeModalWidget()
A modal widget is a special top-level widget which is a subclass of QDialog that specifies the modal parameter of the constructor as true. A modal widget must be closed before the user can continue with other parts of the program.
Modal widgets are organized in a stack. This function returns the active modal widget at the top of the stack.
activePopupWidget(), and topLevelWidgets().
public static QWidget activePopupWidget()
A popup widget is a special top-level widget that sets the Qt::WType_Popup widget flag, e.g. the QMenu widget. When the application opens a popup widget, all events are sent to the popup. Normal widgets and modal widgets cannot be accessed before the popup widget is closed.
Only other popup widgets may be opened when a popup widget is shown. The popup widgets are organized in a stack. This function returns the active popup widget at the top of the stack.
activeModalWidget(), and topLevelWidgets().
public static QWidget activeWindow()
activeWindow() even if there is no focusWidget(), for example if no widget in that window accepts key events. setActiveWindow(), QWidget::setFocus(), QWidget::hasFocus(), and focusWidget().
public static void alert(QWidget widget)
Currently this function does nothing on Qt for Embedded Linux.
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 msec is zero, the flashing will stop and the taskbar entry will turn a different color (currently orange).
On X11, this will cause the window to be marked as "demands attention", the window must not be hidden (i.e. not have hide() called on it, but be visible in some sort of way) in order for this to work.
public static void alert(QWidget widget,
int duration)
Currently this function does nothing on Qt for Embedded Linux.
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 msec is zero, the flashing will stop and the taskbar entry will turn a different color (currently orange).
On X11, this will cause the window to be marked as "demands attention", the window must not be hidden (i.e. not have hide() called on it, but be visible in some sort of way) in order for this to work.
public static java.util.List allWidgets()
The list is empty (QList::isEmpty()) if there are no widgets.
Note that some of the widgets may be hidden.
Example:
public final void updateAllWidgets() {
for (QWidget widget : QApplication.allWidgets())
widget.update();
}
topLevelWidgets(), and QWidget::isVisible().
public static void beep()
public static void changeOverrideCursor(QCursor arg__1)
This function has no effect if setOverrideCursor() wasn't called.
setOverrideCursor(), overrideCursor(), restoreOverrideCursor(), and QWidget::setCursor().
public static QClipboard clipboard()
Note: The QApplication object should already be constructed before accessing the clipboard.
public static void closeAllWindows()
This function is particularly useful for applications with many top-level windows. It could, for example, be connected to a Exit entry in the File menu:
The following code example is written in c++.
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
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 was successfully closed; this can be turned off by setting quitOnLastWindowClosed to false. quitOnLastWindowClosed, lastWindowClosed() , QWidget::close(), QWidget::closeEvent(), lastWindowClosed() , quit(), topLevelWidgets(), and QWidget::isWindow().
public static int colorSpec()
QApplication::setColorSpec().
public static int cursorFlashTime()
The default value on X11 is 1000 milliseconds. On Windows, the control panel value is used. Widgets should not cache this value since it may be changed at any time by the user changing the global desktop settings.
Note that on Microsoft Windows, setting this property sets the cursor flash time for all applications.
public static QDesktopWidget desktop()
Note that 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. QDesktopWidget has various functions for obtaining useful geometries upon the desktop, such as QDesktopWidget::screenGeometry() and QDesktopWidget::availableGeometry().
On X11, it is also possible to draw on the desktop.
public static boolean desktopSettingsAware()
setDesktopSettingsAware().
public static int doubleClickInterval()
On Microsoft Windows, calling this function sets the double click interval for all applications.
public static QWidget focusWidget()
QWidget::setFocus(), QWidget::hasFocus(), activeWindow(), and focusChanged() .
public static QFont font()
setFont(), fontMetrics(), and QWidget::font().
public static QFont font(QWidget arg__1)
Returns the default font for the widget.
fontMetrics(), and QWidget::setFont().
public static QFontMetrics fontMetrics()
font(), setFont(), QWidget::fontMetrics(), and QPainter::fontMetrics().
public static QSize globalStrut()
Example:
public static QSize sizeHint() {
return new QSize(80, 25).expandedTo(QApplication.globalStrut());
}
By default, this property contains a QSize object with zero width and height.
public static boolean isEffectEnabled(Qt.UIEffect arg__1)
By default, Qt will try to use the desktop settings. Call setDesktopSettingsAware(false) to prevent this.
Note: All effects are disabled on screens running at less than 16-bit color depth.
setEffectEnabled(), and Qt::UIEffect .
public static boolean isLeftToRight()
Qt::LeftToRight ; otherwise returns false. layoutDirection(), and isRightToLeft().
public static boolean isRightToLeft()
Qt::RightToLeft ; otherwise returns false. layoutDirection(), and isLeftToRight().
public static Qt.LayoutDirection keyboardInputDirection()
public static int keyboardInputInterval()
public static QLocale keyboardInputLocale()
public static Qt.KeyboardModifiers keyboardModifiers()
QEvent::KeyPress and QEvent::KeyRelease events). It should be noted 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.
mouseButtons().
public static Qt.LayoutDirection layoutDirection()
QWidget::layoutDirection, isLeftToRight(), and isRightToLeft().
public static Qt.MouseButtons mouseButtons()
It should be noted this may not reflect the actual buttons held on theinput 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.
keyboardModifiers().
public static QPalette palette()
setPalette(), and QWidget::palette().
public static QPalette palette(QWidget arg__1)
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 isn't a 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.
setPalette(), and QWidget::palette().
public static boolean quitOnLastWindowClosed()
If this property is true, the applications quits when the last visible primary window (i.e. window with no parent) 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.
quit(), and QWidget::close().
public static void restoreOverrideCursor()
setOverrideCursor(). If setOverrideCursor() has been called twice, calling restoreOverrideCursor() will activate the first cursor set. Calling this function a second time restores the original widgets' cursors.
setOverrideCursor(), and overrideCursor().
public static void setActiveWindow(QWidget act)
Warning: This function does not set the keyboard focus to the active widget. Call QWidget::activateWindow() instead.
It sets the activeWindow() and focusWidget() attributes and sends proper WindowActivate /WindowDeactivate and FocusIn /FocusOut events to all appropriate widgets. The window will then be painted in active state (e.g. cursors in line edits will blink), and it will have tool tips enabled.
activeWindow(), and QWidget::activateWindow().
public static void setColorSpec(int arg__1)
The color specification controls how the application allocates colors when run on a display with a limited amount of colors, e.g. 8 bit / 256 color displays.
The color specification must be set before you create the QApplication object.
The options are:
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 Windows machines 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, Qt 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). Under X11 the effect is: 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. Example:
public static void main(String args[]) {
QApplication.setColorSpec(QApplication.ColorSpec.ManyColor.value());
QApplication.initialize(args);
...
QApplication.exec();
}
colorSpec().
public static void setCursorFlashTime(int arg__1)
The default value on X11 is 1000 milliseconds. On Windows, the control panel value is used. Widgets should not cache this value since it may be changed at any time by the user changing the global desktop settings.
Note that on Microsoft Windows, setting this property sets the cursor flash time for all applications.
public static void setDesktopSettingsAware(boolean arg__1)
This function must be called before creating the QApplication object, like this:
public static void main(String args[]) {
QApplication.setDesktopSettingsAware(false);
QApplication.initialize(args);
...
QApplication.exec();
}
desktopSettingsAware().
public static void setDoubleClickInterval(int arg__1)
On Microsoft Windows, calling this function sets the double click interval for all applications.
public static void setEffectEnabled(Qt.UIEffect arg__1)
Note: All effects are disabled on screens running at less than 16-bit color depth.
isEffectEnabled(), Qt::UIEffect , and setDesktopSettingsAware().
public static void setEffectEnabled(Qt.UIEffect arg__1,
boolean enable)
Note: All effects are disabled on screens running at less than 16-bit color depth.
isEffectEnabled(), Qt::UIEffect , and setDesktopSettingsAware().
public static void setGlobalStrut(QSize arg__1)
Example:
public static QSize sizeHint() {
return new QSize(80, 25).expandedTo(QApplication.globalStrut());
}
By default, this property contains a QSize object with zero width and height.
public static void setKeyboardInputInterval(int arg__1)
public static void setLayoutDirection(Qt.LayoutDirection direction)
QWidget::layoutDirection, isLeftToRight(), and isRightToLeft().
public static void setOverrideCursor(QCursor arg__1)
Application override cursors are intended for showing the user that the application is in a special state, for example during an operation that might take some time.
This cursor will be displayed in all the application's widgets until restoreOverrideCursor() or another setOverrideCursor() is called.
Application cursors are stored on an internal stack. setOverrideCursor() pushes the cursor onto the stack, and restoreOverrideCursor() pops the active cursor off the stack. changeOverrideCursor() changes the curently active application override cursor. Every setOverrideCursor() must eventually be followed by a corresponding restoreOverrideCursor(), otherwise the stack will never be emptied.
Example:
QApplication.setOverrideCursor(new QCursor(Qt.CursorShape.WaitCursor));
calculateHugeMandelbrot(); // lunch time...
QApplication.restoreOverrideCursor();
overrideCursor(), restoreOverrideCursor(), changeOverrideCursor(), and QWidget::setCursor().
public static void setQuitOnLastWindowClosed(boolean quit)
If this property is true, the applications quits when the last visible primary window (i.e. window with no parent) 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.
quit(), and QWidget::close().
public static void setStartDragDistance(int l)
For example, if the mouse position of the click is stored in startPos and the current position (e.g. in the mouse move event) is currentPos, you can find out if a drag should be started with code like this:
if (startPos.subtract(currentPos).manhattanLength() >=
QApplication.startDragDistance()) {
startTheDrag();
}
Qt uses this value internally, e.g. in QFileDialog. The default value is 4 pixels.
startDragTime(), QPoint::manhattanLength(), and Drag and Drop.
public static void setStartDragTime(int ms)
Qt also uses this delay internally, e.g. in QTextEdit and QLineEdit, for starting a drag.
The default value is 500 ms.
startDragDistance(), and Drag and Drop.
public static void setStyle(QStyle arg__1)
Example usage:
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. Note that setting the style before a palette has been set (i.e. before creating QApplication) will cause the application to use QStyle::standardPalette() for the palette.
Warning: Qt style sheets are currently not supported for custom QStyle subclasses. We plan to address this in some future release.
style(), QStyle, setPalette(), and desktopSettingsAware().
public static QStyle setStyle(java.lang.String arg__1)
Requests a QStyle object for style from the QStyleFactory.
The string must be one of the QStyleFactory::keys(), typically one of "windows", "motif", "cde", "plastique", "windowsxp", or "macintosh". Style names are case insensitive.
Returns 0 if an unknown style is passed, otherwise the QStyle object returned is set as the application's GUI style.
Warning: To ensure that the application's style is set correctly, it is best to call this function before the QApplication constructor, if possible.
public static void setWheelScrollLines(int arg__1)
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 . By default, this property has a value of 3.
public static void setWindowIcon(QIcon icon)
QWidget::setWindowIcon(), and Setting the Application Icon.
public static int startDragDistance()
For example, if the mouse position of the click is stored in startPos and the current position (e.g. in the mouse move event) is currentPos, you can find out if a drag should be started with code like this:
if (startPos.subtract(currentPos).manhattanLength() >=
QApplication.startDragDistance()) {
startTheDrag();
}
Qt uses this value internally, e.g. in QFileDialog. The default value is 4 pixels.
startDragTime(), QPoint::manhattanLength(), and Drag and Drop.
public static int startDragTime()
Qt also uses this delay internally, e.g. in QTextEdit and QLineEdit, for starting a drag.
The default value is 500 ms.
startDragDistance(), and Drag and Drop.
public static QStyle style()
setStyle(), and QStyle.
public static void syncX()
public static QWidget topLevelAt(QPoint p)
public static QWidget topLevelAt(int x,
int y)
Returns the top-level widget at the point (x, y); returns 0 if there is no such widget.
public static java.util.List topLevelWidgets()
Note that some of the top-level widgets may be hidden, for example a tooltip if no tooltip is currently shown.
Example:
public final void showAllHiddenTopLevelWidgets() {
for (QWidget widget : QApplication.topLevelWidgets()) {
if (widget.isHidden())
widget.show();
}
}
allWidgets(), QWidget::isWindow(), and QWidget::isHidden().
public static QApplication.Type type()
Tty , GuiClient , or GuiServer ). The type is set when constructing the QApplication object.
public static int wheelScrollLines()
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 . By default, this property has a value of 3.
public static QWidget widgetAt(QPoint p)
This function can be slow.
QCursor::pos(), QWidget::grabMouse(), and QWidget::grabKeyboard().
public static QWidget widgetAt(int x,
int y)
Returns the widget at global screen position (x, y), or 0 if there is no Qt widget there.
public static QIcon windowIcon()
QWidget::setWindowIcon(), and Setting the Application Icon.
public static void aboutQtJambi()
This is useful for inclusion in the Help menu of an application.
public static QApplication instance()
public static void setFont(QFont font)
public static void setPalette(QPalette palette)
public static QCursor overrideCursor()
This function returns null if no application cursor has been defined (i.e. the internal cursor stack is empty).
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