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RedHat 9 (Linux i386) - man page for qdesktopwidget (redhat section 3qt)

QDesktopWidget(3qt)							      QDesktopWidget(3qt)

NAME
       QDesktopWidget - Access to screen information on multi-head systems

SYNOPSIS
       #include <qdesktopwidget.h>

       Inherits QWidget.

   Public Members
       QDesktopWidget ()
       ~QDesktopWidget ()
       bool isVirtualDesktop () const
       int numScreens () const
       int primaryScreen () const
       int screenNumber ( QWidget * widget = 0 ) const
       int screenNumber ( const QPoint & point ) const
       QWidget * screen ( int screen = -1 )
       const QRect & screenGeometry ( int screen = -1 ) const
       const QRect & screenGeometry ( QWidget * widget ) const
       const QRect & screenGeometry ( const QPoint & p ) const
       const QRect & availableGeometry ( int screen = -1 ) const
       const QRect & availableGeometry ( QWidget * widget ) const
       const QRect & availableGeometry ( const QPoint & p ) const

DESCRIPTION
       The QDesktopWidget class provides access to screen information on multi-head systems.

       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 must 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.

       <center>
					    [Image Omitted]

       </center>

       In the illustration above, Application One's primary screen is screen 0, and App Two's
       primary screen is screen 1.

       See also Advanced Widgets and Environment Classes.

MEMBER FUNCTION DOCUMENTATION
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 QAppliation::desktop().

QDesktopWidget::~QDesktopWidget ()
       Destroy the object and free allocated resources.

const QRect &; QDesktopWidget::availableGeometry ( int screen = -1 ) const
       Returns the available geometry of the screen with index screen. What is available will be
       subrect of screenGeometry() based on what the platform decides is available (for example
       excludes the Dock and Menubar on Mac OS X, or the taskbar on Windows).

       See also screenNumber() and screenGeometry().

const QRect &; QDesktopWidget::availableGeometry ( QWidget * widget ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the available geometry of the screen which contains widget.

       See also screenGeometry().

const QRect &; QDesktopWidget::availableGeometry ( const QPoint & p ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the available geometry of the screen which contains p.

       See also screenGeometry().

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.

int QDesktopWidget::numScreens () const
       Returns the number of available screens.

       See also primaryScreen().

int QDesktopWidget::primaryScreen () const
       Returns the index of the primary screen.

       See also numScreens().

QWidget * QDesktopWidget::screen ( int screen = -1 )
       Returns a widget that represents the screen with index screen. This widget can be used to
       draw directly on the desktop, using an unclipped painter like this:

	   QPainter paint( QApplication::desktop()->screen( 0 ), TRUE );
	   paint.draw...
	   ...
	   paint.end();

       If the system uses a virtual desktop, the returned widget will have the geometry of the
       entire virtual desktop i.e. bounding every screen.

       See also primaryScreen(), numScreens(), and isVirtualDesktop().

const QRect &; QDesktopWidget::screenGeometry ( int screen = -1 ) const
       Returns the geometry of the screen with index screen.

       See also screenNumber().

const QRect &; QDesktopWidget::screenGeometry ( QWidget * widget ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the geometry of the screen which contains widget.

const QRect &; QDesktopWidget::screenGeometry ( const QPoint & p ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the geometry of the screen which contains p.

int QDesktopWidget::screenNumber ( QWidget * widget = 0 ) const
       Returns the index of the screen that contains the largest part of widget, or -1 if the
       widget not on a screen.

       See also primaryScreen().

int QDesktopWidget::screenNumber ( const QPoint & point ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the index of the screen that contains point, or -1 if no screen contains the
       point.

       See also primaryScreen().

SEE ALSO
       http://doc.trolltech.com/qdesktopwidget.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included
       in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qdesktopwidget.3qt) and the Qt version
       (3.1.1).

Trolltech AS				 9 December 2002		      QDesktopWidget(3qt)


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