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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
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Long live Qt 4.5!
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \class QDesktopWidget
+ \brief The QDesktopWidget class provides access to screen information on multi-head systems.
+
+ \ingroup advanced
+ \ingroup desktop
+ \ingroup environment
+ \mainclass
+
+ Systems with more than one graphics card and monitor can manage the
+ physical screen space available either as multiple desktops, or as a
+ large virtual desktop, which usually has the size of the bounding
+ rectangle of all the screens (see isVirtualDesktop()). For an
+ application, one of the available screens is the primary screen, i.e.
+ the screen where the main widget resides (see primaryScreen()). All
+ windows opened in the context of the application should be
+ constrained to the boundaries of the primary screen; for example,
+ it would be inconvenient if a dialog box popped up on a different
+ screen, or split over two screens.
+
+ The QDesktopWidget provides information about the geometry of the
+ available screens with screenGeometry(). The number of screens
+ available is returned by numScreens(). The screen number that a
+ particular point or widget is located in is returned by
+ screenNumber().
+
+ Widgets provided by Qt use this class, for example, to place
+ tooltips, menus and dialog boxes according to the parent or
+ application widget.
+
+ Applications can use this class to save window positions, or to place
+ child widgets on one screen.
+
+ \img qdesktopwidget.png Managing Multiple Screens
+
+ In the illustration above, Application One's primary screen is
+ screen 0, and App Two's primary screen is screen 1.
+
+ \target multiple screens note
+ \note QDesktopWidget inherits the QWidget properties, width() and
+ height(), which specify the size of the desktop. However, for
+ desktops with multiple screens, the size of the desktop is the union
+ of all the screen sizes, so width() and height() should \e not be
+ used for computing the size of a widget to be placed on one of the
+ screens. The correct width and height values are obtained using
+ availableGeometry() or screenGeometry() for a particular screen.
+
+ \sa QApplication, QX11Info::appRootWindow()
+*/
+
+/*!
+ \fn QDesktopWidget::QDesktopWidget()
+
+ Creates the desktop widget.
+
+ If the system supports a virtual desktop, this widget will have
+ the size of the virtual desktop; otherwise this widget will have
+ the size of the primary screen.
+
+ Instead of using QDesktopWidget directly, use QApplication::desktop().
+*/
+
+/*!
+ \fn QDesktopWidget::~QDesktopWidget()
+
+ Destroys the desktop widget and frees any allocated resources.
+*/
+
+/*!
+ \fn bool QDesktopWidget::isVirtualDesktop() const
+
+ Returns true if the system manages the available screens in a
+ virtual desktop; otherwise returns false.
+
+ For virtual desktops, screen() will always return the same widget.
+ The size of the virtual desktop is the size of this desktop
+ widget.
+*/
+
+/*!
+ \fn int QDesktopWidget::primaryScreen() const
+
+ Returns the index of the primary screen.
+
+ \sa numScreens()
+*/
+
+/*!
+ \fn int QDesktopWidget::numScreens() const
+
+ Returns the number of available screens.
+
+ \sa primaryScreen()
+*/
+
+/*!
+ \fn QWidget *QDesktopWidget::screen(int screen)
+
+ Returns a widget that represents the screen with index \a screen
+ (a value of -1 means the default screen).
+
+
+ If the system uses a virtual desktop, the returned widget will
+ have the geometry of the entire virtual desktop; i.e., bounding
+ every \a screen.
+
+ \sa primaryScreen(), numScreens(), isVirtualDesktop()
+*/
+
+/*!
+ \fn const QRect QDesktopWidget::availableGeometry(int screen) const
+
+ Returns the available geometry of the screen with index \a screen. What
+ is available will be subrect of screenGeometry() based on what the
+ platform decides is available (for example excludes the dock and menu bar
+ on Mac OS X, or the task bar on Windows). The default screen is used if
+ \a screen is -1.
+
+ \sa screenNumber(), screenGeometry()
+*/
+
+/*!
+ \fn const QRect QDesktopWidget::availableGeometry(const QWidget *widget) const
+ \overload
+
+ Returns the available geometry of the screen which contains \a widget.
+
+ \sa screenGeometry()
+*/
+
+/*!
+ \fn const QRect QDesktopWidget::availableGeometry(const QPoint &p) const
+ \overload
+
+ Returns the available geometry of the screen which contains \a p.
+
+ \sa screenGeometry()
+*/
+
+
+/*!
+ \fn const QRect QDesktopWidget::screenGeometry(int screen) const
+
+ Returns the geometry of the screen with index \a screen. The default
+ screen is used if \a screen is -1.
+
+ \sa screenNumber()
+*/
+
+/*!
+ \fn const QRect QDesktopWidget::screenGeometry(const QWidget *widget) const
+ \overload
+
+ Returns the geometry of the screen which contains \a widget.
+*/
+
+/*!
+ \fn const QRect QDesktopWidget::screenGeometry(const QPoint &p) const
+ \overload
+
+ Returns the geometry of the screen which contains \a p.
+*/
+
+
+/*!
+ \fn int QDesktopWidget::screenNumber(const QWidget *widget) const
+
+ Returns the index of the screen that contains the largest
+ part of \a widget, or -1 if the widget not on a screen.
+
+ \sa primaryScreen()
+*/
+
+/*!
+ \fn int QDesktopWidget::screenNumber(const QPoint &point) const
+
+ \overload
+ Returns the index of the screen that contains the \a point, or the
+ screen which is the shortest distance from the \a point.
+
+ \sa primaryScreen()
+*/
+
+/*!
+ \fn void QDesktopWidget::resizeEvent(QResizeEvent *event)
+ \reimp
+*/
+
+/*!
+ \fn void QDesktopWidget::resized(int screen)
+
+ This signal is emitted when the size of \a screen changes.
+*/
+
+/*!
+ \fn void QDesktopWidget::workAreaResized(int screen)
+
+ This signal is emitted when the work area available on \a screen changes.
+*/