diff -r 000000000000 -r 1918ee327afb doc/src/examples/systray.qdoc --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/doc/src/examples/systray.qdoc Mon Jan 11 14:00:40 2010 +0000 @@ -0,0 +1,197 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \example desktop/systray + \title System Tray Icon Example + + + The System Tray Icon example shows how to add an icon with a menu + and popup messages to a desktop environment's system tray. + + \image systemtray-example.png Screenshot of the System Tray Icon. + + 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. + + This example consists of one single class, \c Window, providing + the main application window (i.e., an editor for the system tray + icon) and the associated icon. + + \image systemtray-editor.png + + The editor allows the user to choose the preferred icon as well as + set the balloon message's type and duration. The user can also + edit the message's title and body. Finally, the editor provide a + checkbox controlling whether the icon is actually shown in the + system tray, or not. + + \section1 Window Class Definition + + The \c Window class inherits QWidget: + + \snippet examples/desktop/systray/window.h 0 + + We implement several private slots to respond to user + interaction. The other private functions are only convenience + functions provided to simplify the constructor. + + The tray icon is an instance of the QSystemTrayIcon class. To + check whether a system tray is present on the user's desktop, call + the static QSystemTrayIcon::isSystemTrayAvailable() + function. Associated with the icon, we provide a menu containing + the typical \gui minimize, \gui maximize, \gui restore and \gui + quit actions. We reimplement the QWidget::setVisible() function to + update the tray icon's menu whenever the editor's appearance + changes, e.g., when maximizing or minimizing the main application + window. + + Finally, we reimplement QWidget's \l {QWidget::}{closeEvent()} + function to be able to inform the user (when closing the editor + window) that the program will keep running in the system tray + until the user chooses the \gui Quit entry in the icon's context + menu. + + \section1 Window Class Implementation + + When constructing the editor widget, we first create the various + editor elements before we create the actual system tray icon: + + \snippet examples/desktop/systray/window.cpp 0 + + We ensure that the application responds to user input by + connecting most of the editor's input widgets (including the + system tray icon) to the application's private slots. But note the + visibility checkbox; its \l {QCheckBox::}{toggled()} signal is + connected to the \e {icon}'s \l {QSystemTrayIcon::}{setVisible()} + function instead. + + \snippet examples/desktop/systray/window.cpp 3 + + The \c setIcon() slot is triggered whenever the current index in + the icon combobox changes, i.e., whenever the user chooses another + icon in the editor. Note that it is also called when the user + activates the tray icon with the left mouse button, triggering the + icon's \l {QSystemTrayIcon::}{activated()} signal. We will come + back to this signal shortly. + + The QSystemTrayIcon::setIcon() function sets the \l + {QSystemTrayIcon::}{icon} property that holds the actual 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. + + Note that 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. + + \snippet examples/desktop/systray/window.cpp 4 + + Whenever the user activates the system tray icon, it emits its \l + {QSystemTrayIcon::}{activated()} signal passing the triggering + reason as parameter. QSystemTrayIcon provides the \l + {QSystemTrayIcon::}{ActivationReason} enum to describe how the + icon was activated. + + In the constructor, we connected our icon's \l + {QSystemTrayIcon::}{activated()} signal to our custom \c + iconActivated() slot: If the user has clicked the icon using the + left mouse button, this function changes the icon image by + incrementing the icon combobox's current index, triggering the \c + setIcon() slot as mentioned above. If the user activates the icon + using the middle mouse button, it calls the custom \c + showMessage() slot: + + \snippet examples/desktop/systray/window.cpp 5 + + When the \e showMessage() slot is triggered, we first retrieve the + message icon depending on the currently chosen message type. The + QSystemTrayIcon::MessageIcon enum describes the icon that is shown + when a balloon message is displayed. Then we call + QSystemTrayIcon's \l {QSystemTrayIcon::}{showMessage()} function + to show the message with the title, body, and icon for the time + specified in milliseconds. + + Mac OS X users note: The Growl notification system must be + installed for QSystemTrayIcon::showMessage() to display messages. + + QSystemTrayIcon also has the corresponding, \l {QSystemTrayIcon::} + {messageClicked()} signal, which is emitted when the user clicks a + message displayed by \l {QSystemTrayIcon::}{showMessage()}. + + \snippet examples/desktop/systray/window.cpp 6 + + In the constructor, we connected the \l + {QSystemTrayIcon::}{messageClicked()} signal to our custom \c + messageClicked() slot that simply displays a message using the + QMessageBox class. + + QMessageBox provides a modal dialog with a short message, an icon, + and buttons laid out depending on the current style. It supports + four severity levels: "Question", "Information", "Warning" and + "Critical". The easiest way to pop up a message box in Qt is to + call one of the associated static functions, e.g., + QMessageBox::information(). + + As we mentioned earlier, we reimplement a couple of QWidget's + virtual functions: + + \snippet examples/desktop/systray/window.cpp 1 + + Our reimplementation of the QWidget::setVisible() function updates + the tray icon's menu whenever the editor's appearance changes, + e.g., when maximizing or minimizing the main application window, + before calling the base class implementation. + + \snippet examples/desktop/systray/window.cpp 2 + + We have reimplemented the QWidget::closeEvent() event handler to + receive widget close events, showing the above message to the + users when they are closing the editor window. + + In addition to the functions and slots discussed above, we have + also implemented several convenience functions to simplify the + constructor: \c createIconGroupBox(), \c createMessageGroupBox(), + \c createActions() and \c createTrayIcon(). See the \l + {desktop/systray/window.cpp}{window.cpp} file for details. +*/