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QSystemTrayIcon Class Reference
[QtGui module]

The QSystemTrayIcon class provides an icon for an application in the system tray. More...

 #include <QSystemTrayIcon>

Inherits QObject.

This class was introduced in Qt 4.2.

Public Types

Properties

Public Functions

Public Slots

Signals

Static Public Members

Additional Inherited Members


Detailed Description

The QSystemTrayIcon class provides an icon for an application in the system tray.

Modern operating systems usually provide a special area on the desktop, called the system tray or notification area, where long-running applications can display icons and short messages.

The system tray on Windows XP.

The QSystemTrayIcon class can be used on the following platforms:

To check whether a system tray is present on the user's desktop, call the QSystemTrayIcon::isSystemTrayAvailable() static function.

To add a system tray entry, create a QSystemTrayIcon object, call setContextMenu() to provide a context menu for the icon, and call show() to make it visible in the system tray. Status notification messages ("balloon messages") can be displayed at any time using showMessage().

If the system tray is unavailable when a system tray icon is constructed, but becomes available later, QSystemTrayIcon will automatically add an entry for the application in the system tray if the icon is visible.

The activated() signal is emitted when the user activates the icon.

Only on X11 when a tooltip is requested the QSystemTrayIcon receives a QHelpEvent of type QEvent::ToolTip. This is not supported on any other platform.

See also QDesktopServices, QDesktopWidget, and Desktop Integration.


Member Type Documentation

enum QSystemTrayIcon::ActivationReason

This enum describes the reason the system tray was activated.

ConstantValueDescription
QSystemTrayIcon::Unknown0Unknown reason
QSystemTrayIcon::Context1The context menu for the system tray entry was requested
QSystemTrayIcon::DoubleClick2The system tray entry was double clicked
QSystemTrayIcon::Trigger3The system tray entry was clicked
QSystemTrayIcon::MiddleClick4The system tray entry was clicked with the middle mouse button

See also activated().

enum QSystemTrayIcon::MessageIcon

This enum describes the icon that is shown when a balloon message is displayed.

ConstantValueDescription
QSystemTrayIcon::NoIcon0No icon is shown.
QSystemTrayIcon::Information1An information icon is shown.
QSystemTrayIcon::Warning2A standard warning icon is shown.
QSystemTrayIcon::Critical3A critical warning icon is shown.

See also QMessageBox.


Property Documentation

icon : QIcon

This property holds the system tray icon.

On Windows, the system tray icon size is 16x16; on X11, the preferred size is 22x22. The icon will be scaled to the appropriate size as necessary.

On X11, due to a limitation in the system tray specification, mouse clicks on transparent areas in the icon are propagated to the system tray. If this behavior is unacceptable, we suggest using an icon with no transparency.

Access functions:

toolTip : QString

This property holds the tooltip for the system tray entry.

On some systems, the tooltip's length is limited. The tooltip will be truncated if necessary.

Access functions:

visible : bool

This property holds whether the system tray entry is visible.

Setting this property to true or calling show() makes the system tray icon visible; setting this property to false or calling hide() hides it.

Access functions:


Member Function Documentation

QSystemTrayIcon::QSystemTrayIcon ( QObject * parent = 0 )

Constructs a QSystemTrayIcon object with the given parent.

The icon is initially invisible.

See also visible.

QSystemTrayIcon::QSystemTrayIcon ( const QIcon & icon, QObject * parent = 0 )

Constructs a QSystemTrayIcon object with the given icon and parent.

The icon is initially invisible.

See also visible.

QSystemTrayIcon::~QSystemTrayIcon ()

Removes the icon from the system tray and frees all allocated resources.

void QSystemTrayIcon::activated ( QSystemTrayIcon::ActivationReason reason )   [signal]

This signal is emitted when the user activates the system tray icon. reason specifies the reason for activation. QSystemTrayIcon::ActivationReason enumerates the various reasons.

See also QSystemTrayIcon::ActivationReason.

QMenu * QSystemTrayIcon::contextMenu () const

Returns the current context menu for the system tray entry.

See also setContextMenu().

void QSystemTrayIcon::hide ()   [slot]

Hides the system tray entry.

See also show() and visible.

bool QSystemTrayIcon::isSystemTrayAvailable ()   [static]

Returns true if the system tray is available; otherwise returns false.

If the system tray is currently unavailable but becomes available later, QSystemTrayIcon will automatically add an entry in the system tray if it is visible.

void QSystemTrayIcon::messageClicked ()   [signal]

This signal is emitted when the message displayed using showMessage() was clicked by the user.

See also activated().

void QSystemTrayIcon::setContextMenu ( QMenu * menu )

Sets the specified menu to be the context menu for the system tray icon.

The menu will pop up when the user requests the context menu for the system tray icon by clicking the mouse button.

On Mac OS X, this is currenly converted to a NSMenu, so the aboutToHide() signal is not emitted.

See also contextMenu().

void QSystemTrayIcon::show ()   [slot]

Shows the icon in the system tray.

See also hide() and visible.

void QSystemTrayIcon::showMessage ( const QString & title, const QString & message, MessageIcon icon = Information, int milliseconds = 10000 )

Shows a balloon message for the entry with the given title, message and icon for the time specified in milliseconds.

Message can be clicked by the user; the messageClicked() signal will emitted when this occurs.

Note that display of messages are dependent on the system configuration and user preferences, and that messages may not appear at all. Hence, it should not be relied upon as the sole means for providing critical information.

See also show() and supportsMessages().

bool QSystemTrayIcon::supportsMessages ()   [static]

Returns true if the system tray supports balloon messages; otherwise returns false.

Mac OS X does not support ballon messages currently.

See also showMessage().


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Qt 4.2.3