Typedef for a function pointer with no arguments which returns void.

Refer to setColorSpec() for full details.

Initializes the window system and constructs an application object with argc command line arguments in argv. The data referred to by argc and argv must remain valid for the entire lifetime of the QApplication object. In addition, argc must be greater than zero and argv must contain at least one valid character string.

Only one application object should be created for a given program. The application object must be constructed before any paint devices are constructed. The global qApp pointer refers to this application object.

QApplication automatically supports the following command line options.

-style= style

Sets the application GUI style. Possible values depend on your platform configuration. If CopperSpice was compiled with additional styles or has additional styles as plugins these will be usable for this command line option.

-style style

Same as listed above.

-stylesheet= stylesheet

Sets the application style sheet. The value must be a path to a file that contains the style sheet. Relative URLs in the style sheet file are relative to the Style Sheet file's path.

-stylesheet stylesheet

Same as listed above.

-widgetcount

Prints debug message at the end about number of widgets left undestroyed and maximum number of widgets existed at the same time

-reverse

Sets the application's layout direction to Qt::RightToLeft

See also

arguments()

Cleans up any window system resources that were allocated by this application. Sets the global variable qApp to nullptr.

Displays a simple message box about CopperSpice. The message includes the version number of CopperSpice being used by the application. This is useful for inclusion in the Help menu of your application.

This method is a convenience slot for QMessageBox::aboutCs().

Returns the active modal widget. Modal widgets are organized in a stack.

A modal widget is a special top-level widget which inherits from QDialog. A modal widget must be closed before the user can continue with other parts of the program.

See also

activePopupWidget(), topLevelWidgets()

Returns the active popup widget. Popup widgets are organized in a stack.

A popup widget is a special top-level widget with the Qt::WType_Popup flag enabled. When the application opens a popup widget all events are sent to this widget. Other widgets and modal widgets can not be accessed before the popup widget is closed.

Only other popup widgets may be opened while the current popup widget is active.

See also

activeModalWidget(), topLevelWidgets()

Returns the application top level window which has the keyboard input focus or a nullptr if no application window has focus. There might be an activeWindow() even if there is no focusWidget(), for example if no widget in that window accepts key events.

See also

setActiveWindow(), QWidget::setFocus(), QWidget::hasFocus(), focusWidget()

Causes an alert to be shown for widget if the window is not the active window. The alert is shown for duration in milliseconds. If duration is zero then the alert is shown indefinitely until the window becomes active again.

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 duration 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.

Returns a list of all the widgets in the application. The list is empty (QList::isEmpty()) if there are no widgets.

Note

Some of the widgets may be hidden.

See also

topLevelWidgets(), QWidget::isVisible()

Returns a list of all the windows in the application. The list is empty if there are no windows.

See also

topLevelWindows()

Returns the value of the property applicationDisplayName.

Returns the value of the property applicationState.

This signal is emitted when the state of the application changes.

See also

applicationState()

Returns the value of the property autoSipEnabled.

Sounds the bell using the default volume and sound.

Changes the currently active application override cursor to cursor. This method has no effect if setOverrideCursor() was not called.

See also

setOverrideCursor(), overrideCursor(), restoreOverrideCursor(), QWidget::setCursor()

Returns a pointer to the application global clipboard.

Note

The QApplication object should already be constructed before accessing the clipboard.

Closes all top-level windows.

This method 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 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.

See also

quitOnLastWindowClosed, lastWindowClosed(), QWidget::close(), QWidget::closeEvent(), lastWindowClosed(), quit(), topLevelWidgets(), QWidget::isWindow()

Returns the color specification.

See also

QApplication::setColorSpec()

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.

You should not exit the application within this signal. 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 sessionManager for explicit permission. Refer to QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details and example usage.

Note

You should use Qt::DirectConnection when connecting to this signal.

See also

isSessionRestored(), sessionId(), Session Management

Returns the value of the property cursorFlashTime.

Returns the desktop widget (also called the root window).

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.

Returns true if CopperSpice is set to use the system's standard colors, fonts, etc., otherwise returns false. The default is true.

See also

setDesktopSettingsAware()

Returns the highest screen device pixel ratio found on the system. This is the ratio between physical pixels and device-independent pixels.

Use this method only when you do not know which window you are targeting. If you do know the target window, use QWindow::devicePixelRatio() instead.

See also

QWindow::devicePixelRatio()

Returns the value of the property doubleClickInterval.

Reimplemented from QCoreApplication::event()

Enters the main event loop and waits until exit() is called, then returns the value that was set to exit() (which is 0 if exit() is called via quit()).

It is necessary to call this function to start event handling. The main event loop receives events from the window system and dispatches these to the application widgets.

Generally, no user interaction can take place before calling exec(). As a special case, modal widgets like QMessageBox can be used before calling exec(), because modal widgets call exec() to start a local event loop.

To make your application perform idle processing, i.e., executing a special function whenever there are no pending events, use a QTimer with 0 timeout. More advanced idle processing schemes can be achieved using processEvents().

We recommend that you connect clean-up code to the aboutToQuit() signal, instead of putting it in your application's main() function. This is because, on some platforms the QApplication::exec() call may not return. For example, on the Windows platform, when the user logs off, the system terminates the process after CopperSpice closes all top-level windows. Hence, there is no guarantee that the application will have time to exit its event loop and execute code at the end of the main() function, after the QApplication::exec() call.

See also

quitOnLastWindowClosed, quit(), exit(), processEvents(), QCoreApplication::exec()

This signal is emitted when the widget that has keyboard focus changes from old to current. For example if the users pressed the tab-key, clicked into a widget or changed the active window. Both old and current can be the null-pointer.

The signal is emitted after both widget have been notified about the change through QFocusEvent.

See also

QWidget::setFocus(), QWidget::clearFocus(), Qt::FocusReason

Returns the QObject in currently active window that will be final receiver of events tied to focus, such as key events.

This signal is emitted when final receiver of events tied to focus is changed. The parameter focusObject is the new receiver.

See also

focusObject()

Returns the application widget that has the keyboard input focus or a nullptr if no widget in this application has focus.

See also

QWidget::setFocus(), QWidget::hasFocus(), activeWindow(), focusChanged()

Returns the QWindow that receives events tied to focus, such as key events.

This signal is emitted when the focused window changes. The parameter focusWindow is the new focused window.

See also

focusWindow()

Returns the default application font.

See also

setFont(), fontMetrics(), QWidget::font()

Returns the font for widgets of the given className.

See also

setFont(), QWidget::font()

Returns the default font for the widget.

See also

fontMetrics(), QWidget::setFont()

This signal is emitted when application fonts are loaded or removed.

See also

QFontDatabase::addApplicationFont(), QFontDatabase::addApplicationFontFromData(), QFontDatabase::removeAllApplicationFonts(), QFontDatabase::removeApplicationFont()

Returns display (screen) font metrics for the application font.

See also

font(), setFont(), QWidget::fontMetrics(), QPainter::fontMetrics()

Returns the value of the property globalStrutf.

Returns the input method.

The input method returns properties about the state and position of the virtual keyboard. It also provides information about the position of the current focused input element.

See also

QInputMethod

Returns true if effect is enabled, otherwise returns false. By default, CopperSpice will try to use the desktop settings. To prevent this, call setDesktopSettingsAware(false).

Note

All effects are disabled on screens running at less than 16-bit color depth.

See also

setEffectEnabled(), Qt::UIEffect

Returns whether QApplication will use fallback session management. The default is true.

If this is true and the session manager allows user interaction, QApplication will try to close toplevel windows after commitDataRequest() has been emitted. If a window cannot be closed, session shutdown will be canceled and the application will keep running.

Fallback session management only benefits applications that have an "are you sure you want to close this window?" feature or other logic that prevents closing a toplevel window depending on certain conditions, and that do nothing to explicitly implement session management. In applications that do implement session management using the proper session management API, fallback session management interferes and may break session management logic.

Warning: If all windows are closed due to fallback session management and quitOnLastWindowClosed() is true, the application will quit before it is explicitly instructed to quit through the platform's session management protocol. That violation of protocol may prevent the platform session manager from saving application state.

See also

setFallbackSessionManagementEnabled(), QSessionManager::allowsInteraction(), saveStateRequest(), commitDataRequest(), Session Management

Returns true if the application's layout direction is Qt::LeftToRight, otherwise returns false.

See also

layoutDirection(), isRightToLeft()

Returns true if the application's layout direction is Qt::RightToLeft, otherwise returns false.

See also

layoutDirection(), isLeftToRight()

Returns true if the application is currently saving the session, otherwise returns false. This is true when commitDataRequest() and saveStateRequest() are emitted, but also when the windows are closed afterwards by session management.

See also

sessionId(), commitDataRequest(), saveStateRequest()

Returns true if the application has been restored from an earlier session, otherwise returns false.

See also

sessionId(), commitDataRequest(), saveStateRequest()

Returns the value of the property keyboardInputInterval.

Returns the current state of the modifier keys on the keyboard. The current state is updated synchronously as the event queue is emptied of events that will spontaneously change the keyboard state (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.

See also

mouseButtons(), queryKeyboardModifiers()

This signal is emitted from QApplication::exec() 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 transient windows such as splash screens, tool windows, and popup menus
• QApplication implicitly quits when this signal is emitted.

This feature can be turned off by setting quitOnLastWindowClosed to false.

See also

QWidget::close()

Returns the value of the property layoutDirection.

Sets the value of the property to direction.

Returns the most recently shown modal window. If no modal windows are visible, this method returns a nullptr.

A modal window is a window which has its modality property set to either Qt::WindowModal or Qt::ApplicationModal. A modal window must be closed before the user can continue with other parts of the program. Modal window are organized in a stack. Returns the modal window at the top of the stack.

See also

Qt::WindowModality, QWindow::setModality()

Returns the current state of the buttons on the mouse. The current state is updated synchronously as the event queue is emptied of events that will spontaneously change the mouse state (QEvent::MouseButtonPress and QEvent::MouseButtonRelease events).

It should be noted this may not reflect the actual buttons held on the input 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.

See also

keyboardModifiers()

Reimplemented from QCoreApplication::notify()

Returns the active application override cursor. Returns nullptr if no application cursor has been defined.

See also

setOverrideCursor(), restoreOverrideCursor()

Returns the application palette.

See also

setPalette(), QWidget::palette()

Returns the palette for widgets of the given className.

See also

setPalette(), QWidget::palette()

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 is no 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.

See also

setPalette(), QWidget::palette()

Sets the value of the property to palette.

Returns a function pointer to the platformplugin matching the given function.

Returns the value of the property platformName.

Returns the platform's native interface, for platform specific functionality.

Returns the value of the property primaryScreen.

Sets the value of the property to screen.

Queries and returns the state of the modifier keys on the keyboard. Unlike keyboardModifiers, this method returns the actual keys held on the input device at the time of calling the method.

It does not rely on the keypress events having been received by this process, which makes it possible to check the modifiers while moving a window, for instance. In most cases you should use keyboardModifiers(), which is faster and more accurate since it contains the state of the modifiers as they were when the currently processed event was received.

See also

keyboardModifiers()

Returns the value of the property quitOnLastWindowClosed.

Undoes the last 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.

See also

setOverrideCursor(), overrideCursor()

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.

You should never exit the application within this signal. Instead, the session manager may or may not do this afterwards, depending on the context. Furthermore, 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 sessionManager for explicit permission. See QSessionManager::allowsInteraction() and QSessionManager::allowsErrorInteraction() for details.

Note

You should use Qt::DirectConnection when connecting to this signal.

See also

isSessionRestored(), sessionId(), commitDataRequest(), Session Management

This signal is emitted whenever a new screen has been added to the system.

See also

screens(), primaryScreen, screenRemoved()

This signal is emitted whenever a screen is removed from the system. It provides an opportunity to manage the windows on the screen before CopperSpice falls back to moving them to the primary screen.

See also

screens(), screenAdded(), QObject::destroyed(), QWindow::setScreen()

Returns a list of all the screens associated with the windowing system the application is connected to.

Returns the current session identifier. 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.

See also

isSessionRestored(), sessionKey(), commitDataRequest(), saveStateRequest()

Returns the session key in the current session. 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 commitDataRequest() or saveStateRequest().

See also

isSessionRestored(), sessionId(), commitDataRequest(), saveStateRequest()

Sets the active window to the active widget in response to a system event. The method is called from the platform specific event handlers.

Warning

This method 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.

See also

activeWindow(), QWidget::activateWindow()

Sets the value of the property to name. The given name will appear as a suffix in every window title.

Sets the value of the property to enabled.

Sets the color specification for the application to spec. The color specification controls how the application allocates colors when run on a display with a limited amount of colors, for example 8 bit / 256 color displays. The color specification must be set before you create the QApplication object.

The options are shown below.

• 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 the Windows platform, 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, CopperSpice 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.
  For X11 the effect is:

  • For 256-color displays which have at best a 256 color true color visual, the default visual is used, and colors are allocated from a color cube. The color cube is the 6x6x6 (216 color) "Web palette" (the red, green, and blue components always have one of the following values: 0x00, 0x33, 0x66, 0x99, 0xCC, or 0xFF), but the number of colors can be changed by the -ncols option. The user can force the application to use the true color visual with the -visual option.
  • For 256-color displays which have a true color visual with more than 256 colors, use that visual. Silicon Graphics X servers this feature, for example. They provide an 8 bit visual by default but can deliver true color when asked.

  On Windows, CopperSpice creates a Windows palette, and fills it with a color cube.

Be aware that the 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.

See also

colorSpec()

Sets the value of the property to duration.

Sets whether CopperSpice should use the system's standard colors, fonts, etc., to on. By default, this is true. This method must be called before creating the QApplication object, like this:

See also

desktopSettingsAware()

Sets the value of the property to interval.

Enables the UI effect if enable is true, otherwise the effect will not be used. All effects are disabled on screens running at less than 16-bit color depth.

See also

isEffectEnabled(), Qt::UIEffect, setDesktopSettingsAware()

Sets the value of the property to enable.

Changes the default application font to font. If className is passed, the change applies only to classes that inherit className (as reported by QObject::inherits()).

On application start-up, the default font depends on the window system. It can vary depending on both the window system version and the locale. This function lets you override the default font; but overriding may be a bad idea because, for example, some locales need extra large fonts to support their special characters.

Warning

Do not use this method in conjunction with Style Sheets. The font of an application can be customized using the "font" style sheet property. To set a bold font for all QPushButtons, set the application styleSheet() as "QPushButton { font: bold }"

See also

font(), fontMetrics(), QWidget::setFont()

Sets the value of the property to size.

Sets the value of the property to interval.

Sets the value of the property to direction.

Sets the application override cursor to cursor. 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 currently active application override cursor.

Every setOverrideCursor() must eventually be followed by a corresponding restoreOverrideCursor(), otherwise the stack will never be emptied.

See also

overrideCursor(), restoreOverrideCursor(), changeOverrideCursor(), QWidget::setCursor()

Changes the default application palette to palette.

If className is passed, the change applies only to widgets that inherit className (as reported by QObject::inherits()). If className is empty the change affects all widgets, thus overriding any previously set class specific palettes.

The palette may be changed according to the current GUI style in QStyle::polish().

Warning

Do not use this function in conjunction with Style Sheets. When using style sheets the palette of a widget can be customized using the "color", "background-color", "selection-color", "selection-background-color" and "alternate-background-color".

Note

Some styles do not use the palette for all drawing, for instance, if they make use of native theme engines. This is the case for the Windows XP, Windows Vista, and Mac OS X styles.

See also

QWidget::setPalette(), palette(), QStyle::polish()

Sets the value of the property to quit.

Sets the value of the property to distance.

Sets the value of the property to time.

Requests a QStyle object for style from the QStyleFactory. The string must be one of the QStyleFactory::keys(), typically one of "windows", "windowsxp", "windowsvista", or "macintosh", "gtk", or "fusion". Style names are case insensitive.

Returns nullptr 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 method before the QApplication constructor, if possible.

Sets the application's GUI style to style. Ownership of the style object is transferred to QApplication, so QApplication will delete the style object on application exit or when a new style is set and the old style is still the parent of the application object.

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.

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

CopperSpice style sheets are currently not supported for custom QStyle subclasses.

See also

style(), QStyle, setPalette(), desktopSettingsAware()

Sets the value of the property to sheet.

Sets the value of the property to lines.

Sets the value of the property to icon.

Returns the value of the property startDragDistance.

Returns the value of the property startDragTime.

Returns the application's style object.

See also

setStyle(), QStyle

Returns the application style hints. The style hints encapsulate a set of platform dependent properties such as double click intervals and full width selection.

Returns the value of the property.

Used to synchronize the CopperSpice state with the Window Systems state.

This method will first empty events by calling QCoreApplication::processEvents(), then the platform plugin will sync up with the windowsystem, and finally events will be delivered by another call to QCoreApplication::processEvents();

Returns the top level widget at the given point pos, returns a nullptr if there is no such widget.

Returns a list of the top level widgets (windows) in the application.

Note

Some of the top-level widgets may be hidden.

See also

allWidgets(), QWidget::isWindow(), QWidget::isHidden()

Returns the top level window at the position of pos if a window exists.

Returns a list of the top level windows in the application.

See also

allWindows()

Returns the value of the property wheelScrollLines.

Returns the widget at global screen position point. Returns nullptr if there is no widget in that location. This method can be slow.

See also

QCursor::pos(), QWidget::grabMouse(), QWidget::grabKeyboard()

Returns the widget at global screen position (x, y), or nullptr if there is no widget there.

Returns the value of the property windowIcon.

This property holds the user-visible name of this application

This name is shown to the user, for instance in window titles. It can be translated, if necessary. If not set, the application display name defaults to the application name.

This property holds toggles automatic SIP (software input panel) visibility.

Set this property to true to automatically display the SIP when entering widgets that accept keyboard input. This property only affects widgets with the WA_InputMethodEnabled attribute set, and is typically used to launch a virtual keyboard on devices which have very few or no keys.

The default is platform dependent.

This property holds the text cursor's flash (blink) time in milliseconds.

The flash time is the time required to display, invert and restore the caret display. Usually the text cursor is displayed for half the cursor flash time, then hidden for the same amount of time, but this may vary.

The default value on X11 is 1000 milliseconds. On Windows, the Control Panel value is used and setting this property sets the cursor flash time for all applications.

We recommend that widgets do not cache this value as it may change at any time if the user changes the global desktop settings.

This property holds the time limit in milliseconds that distinguishes a double click from two consecutive mouse clicks.

The default value on X11 is 400 milliseconds. On Windows and Mac OS, the operating system's value is used. However, on Windows calling this function sets the double click interval for all applications.

This property holds the minimum size that any GUI element that the user can interact with should have. For example, no button should be resized to be smaller than the global strut size. The strut size should be considered when reimplementing GUI controls that may be used on touch-screens or similar I/O devices.

By default, this property contains a QSize object with zero width and height.

This property holds the time limit in milliseconds that distinguishes a key press from two consecutive key presses.

The default value on X11 is 400 milliseconds. On Windows and Mac OS, the operating system's value is used.

This property holds the default layout direction for this application. On system start-up the default layout direction depends on the application's language.

See also

QWidget::layoutDirection, isLeftToRight(), isRightToLeft()

This property holds the name of the underlying platform plugin. The following platform plugin names are supported.

cocoa

platform plugin for Mac OS X

windows

platform plugin for Windows desktop

xcb

platform plugin used on Linux platforms

This property holds the primary (or default) screen of the application. This will be the screen where QWindows are initially shown, unless otherwise specified.

This property holds whether the application implicitly quits when the last window is closed. The default is true.

If this property is true, the application 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.

See also

quit(), QWidget::close()

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. The default value is 4 pixels.

For example, if the mouse position of the mouse click is stored in startPos and the current position is currentPos, you can find out if a drag should be started with code like the following.

See also

startDragTime(), QPoint::manhattanLength(), Drag and Drop

This property holds the time in milliseconds that a mouse button must be held down before a drag and drop operation will begin. The default value is 500 ms.

If you support drag and drop in your application, and want to start a drag and drop operation after the user has held down a mouse button for a certain amount of time, you should use this property's value as the delay.

See also

startDragDistance(), Drag and Drop

This property holds the application style sheet. By default this property returns an empty string unless the user specifies the -stylesheet option on the command line when running the application.

See also

QWidget::setStyle(), Style Sheets

This property holds the number of lines to scroll a widget, when the mouse wheel is rotated. By default this property has a value of 3.

If the value exceeds the widget's number of visible lines, the widget should interpret the scroll operation as a single page up or page down. If the widget is an 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.

This property holds the default windowIcon.

See also

QWidget::setWindowIcon(), Setting the Application Icon