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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQDesktopWidget Class Reference< / h1 >
< p > The TQDesktopWidget class provides access to screen information on multi-head systems.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "tqdesktopwidget-h.html" > tqdesktopwidget.h< / a > > < / tt >
< p > Inherits < a href = "tqwidget.html" > TQWidget< / a > .
< p > < a href = "tqdesktopwidget-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQDesktopWidget" > < b > TQDesktopWidget< / b > < / a > ()< / li >
< li class = fn > < a href = "#~TQDesktopWidget" > < b > ~TQDesktopWidget< / b > < / a > ()< / li >
< li class = fn > bool < a href = "#isVirtualDesktop" > < b > isVirtualDesktop< / b > < / a > () const< / li >
< li class = fn > int < a href = "#numScreens" > < b > numScreens< / b > < / a > () const< / li >
< li class = fn > int < a href = "#primaryScreen" > < b > primaryScreen< / b > < / a > () const< / li >
< li class = fn > int < a href = "#screenNumber" > < b > screenNumber< / b > < / a > ( TQWidget * widget = 0 ) const< / li >
< li class = fn > int < a href = "#screenNumber-2" > < b > screenNumber< / b > < / a > ( const TQPoint & point ) const< / li >
< li class = fn > TQWidget * < a href = "#screen" > < b > screen< / b > < / a > ( int screen = -1 )< / li >
< li class = fn > const TQRect & < a href = "#screenGeometry" > < b > screenGeometry< / b > < / a > ( int screen = -1 ) const< / li >
< li class = fn > const TQRect & < a href = "#screenGeometry-2" > < b > screenGeometry< / b > < / a > ( TQWidget * widget ) const< / li >
< li class = fn > const TQRect & < a href = "#screenGeometry-3" > < b > screenGeometry< / b > < / a > ( const TQPoint & p ) const< / li >
< li class = fn > const TQRect & < a href = "#availableGeometry" > < b > availableGeometry< / b > < / a > ( int screen = -1 ) const< / li >
< li class = fn > const TQRect & < a href = "#availableGeometry-2" > < b > availableGeometry< / b > < / a > ( TQWidget * widget ) const< / li >
< li class = fn > const TQRect & < a href = "#availableGeometry-3" > < b > availableGeometry< / b > < / a > ( const TQPoint & p ) const< / li >
< / ul >
< h2 > Signals< / h2 >
< ul >
< li class = fn > void < a href = "#resized" > < b > resized< / b > < / a > ( int screen )< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQDesktopWidget class provides access to screen information on multi-head systems.
< p >
< p > 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 < a href = "#isVirtualDesktop" > isVirtualDesktop< / a > ()). For an
application, one of the available screens is the primary screen, i.e.
the screen where the main widget resides (see < a href = "#primaryScreen" > primaryScreen< / a > ()). 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.
< p > The TQDesktopWidget provides information about the geometry of the
available screens with < a href = "#screenGeometry" > screenGeometry< / a > (). The number of screens
available is returned by < a href = "#numScreens" > numScreens< / a > (). The screen number that a
particular point or widget is located in is returned by
< a href = "#screenNumber" > screenNumber< / a > ().
< p > Widgets provided by TQt use this class, for example, to place
tooltips, menus and dialog boxes according to the parent or
application widget.
< p > Applications can use this class to save window positions, or to place
child widgets on one screen.
< p > < center > < img src = "tqdesktopwidget.png" alt = "Managing Multiple Screens" > < / center >
< p > In the illustration above, Application One's primary screen is
screen 0, and App Two's primary screen is screen 1.
< p > < p > See also < a href = "advanced.html" > Advanced Widgets< / a > and < a href = "environment.html" > Environment Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQDesktopWidget" > < / a > TQDesktopWidget::TQDesktopWidget ()
< / h3 >
Creates the desktop widget.
< p > 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.
< p > Instead of using TQDesktopWidget directly, use
< a href = "tqapplication.html#desktop" > TQApplication::desktop< / a > ().
< h3 class = fn > < a name = "~TQDesktopWidget" > < / a > TQDesktopWidget::~TQDesktopWidget ()
< / h3 >
Destroy the object and free allocated resources.
< h3 class = fn > const < a href = "tqrect.html" > TQRect< / a > & < a name = "availableGeometry" > < / a > TQDesktopWidget::availableGeometry ( int screen = -1 ) const
< / h3 >
Returns the available geometry of the screen with index < em > screen< / em > . What
is available will be subrect of < a href = "#screenGeometry" > screenGeometry< / a > () based on what the
platform decides is available (for example excludes the Dock and Menubar
on Mac OS X, or the taskbar on Windows).
< p > < p > See also < a href = "#screenNumber" > screenNumber< / a > () and < a href = "#screenGeometry" > screenGeometry< / a > ().
< h3 class = fn > const < a href = "tqrect.html" > TQRect< / a > & < a name = "availableGeometry-2" > < / a > TQDesktopWidget::availableGeometry ( < a href = "tqwidget.html" > TQWidget< / a > * widget ) const
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns the available geometry of the screen which contains < em > widget< / em > .
< p > < p > See also < a href = "#screenGeometry" > screenGeometry< / a > ().
< h3 class = fn > const < a href = "tqrect.html" > TQRect< / a > & < a name = "availableGeometry-3" > < / a > TQDesktopWidget::availableGeometry ( const < a href = "tqpoint.html" > TQPoint< / a > & p ) const
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns the available geometry of the screen which contains < em > p< / em > .
< p > < p > See also < a href = "#screenGeometry" > screenGeometry< / a > ().
< h3 class = fn > bool < a name = "isVirtualDesktop" > < / a > TQDesktopWidget::isVirtualDesktop () const
< / h3 >
Returns TRUE if the system manages the available screens in a
virtual desktop; otherwise returns FALSE.
< p > For virtual desktops, < a href = "#screen" > screen< / a > () will always return the same widget.
The size of the virtual desktop is the size of this desktop
widget.
< h3 class = fn > int < a name = "numScreens" > < / a > TQDesktopWidget::numScreens () const
< / h3 >
Returns the number of available screens.
< p > < p > See also < a href = "#primaryScreen" > primaryScreen< / a > ().
< h3 class = fn > int < a name = "primaryScreen" > < / a > TQDesktopWidget::primaryScreen () const
< / h3 >
Returns the index of the primary screen.
< p > < p > See also < a href = "#numScreens" > numScreens< / a > ().
< h3 class = fn > void < a name = "resized" > < / a > TQDesktopWidget::resized ( int screen )< tt > [signal]< / tt >
< / h3 >
This signal is emitted when the size of < em > screen< / em > changes.
< h3 class = fn > < a href = "tqwidget.html" > TQWidget< / a > * < a name = "screen" > < / a > TQDesktopWidget::screen ( int screen = -1 )
< / h3 >
Returns a widget that represents the screen with index < em > screen< / em > .
This widget can be used to draw directly on the desktop, using an
unclipped painter like this:
< p > < pre >
< a href = "tqpainter.html" > TQPainter< / a > paint( TQApplication::< a href = "tqapplication.html#desktop" > desktop< / a > ()-> screen( 0 ), TRUE );
paint.draw...
...
paint.< a href = "tqpainter.html#end" > end< / a > ();
< / pre >
< p > If the system uses a virtual desktop, the returned widget will
have the geometry of the entire virtual desktop i.e. bounding
every < em > screen< / em > .
< p > < p > See also < a href = "#primaryScreen" > primaryScreen< / a > (), < a href = "#numScreens" > numScreens< / a > (), and < a href = "#isVirtualDesktop" > isVirtualDesktop< / a > ().
< h3 class = fn > const < a href = "tqrect.html" > TQRect< / a > & < a name = "screenGeometry" > < / a > TQDesktopWidget::screenGeometry ( int screen = -1 ) const
< / h3 >
Returns the geometry of the screen with index < em > screen< / em > .
< p > < p > See also < a href = "#screenNumber" > screenNumber< / a > ().
< h3 class = fn > const < a href = "tqrect.html" > TQRect< / a > & < a name = "screenGeometry-2" > < / a > TQDesktopWidget::screenGeometry ( < a href = "tqwidget.html" > TQWidget< / a > * widget ) const
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns the geometry of the screen which contains < em > widget< / em > .
< h3 class = fn > const < a href = "tqrect.html" > TQRect< / a > & < a name = "screenGeometry-3" > < / a > TQDesktopWidget::screenGeometry ( const < a href = "tqpoint.html" > TQPoint< / a > & p ) const
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns the geometry of the screen which contains < em > p< / em > .
< h3 class = fn > int < a name = "screenNumber" > < / a > TQDesktopWidget::screenNumber ( < a href = "tqwidget.html" > TQWidget< / a > * widget = 0 ) const
< / h3 >
Returns the index of the screen that contains the largest
part of < em > widget< / em > , or -1 if the widget not on a screen.
< p > < p > See also < a href = "#primaryScreen" > primaryScreen< / a > ().
< h3 class = fn > int < a name = "screenNumber-2" > < / a > TQDesktopWidget::screenNumber ( const < a href = "tqpoint.html" > TQPoint< / a > & point ) const
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns the index of the screen that contains < em > point< / em > , or -1 if
no screen contains the point.
< p > < p > See also < a href = "#primaryScreen" > primaryScreen< / a > ().
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