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| 20 | <font color="#004faf">Home</font></a>
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| 22 | <font color="#004faf">All Classes</font></a>
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 31 | </td>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QDesktopWidget Class Reference</h1>
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| 33 |
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| 34 | <p>The QDesktopWidget class provides access to screen information on multi-head systems.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qdesktopwidget-h.html">qdesktopwidget.h</a>></tt>
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| 37 | <p>Inherits <a href="qwidget.html">QWidget</a>.
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| 38 | <p><a href="qdesktopwidget-members.html">List of all member functions.</a>
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| 39 | <h2>Public Members</h2>
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| 40 | <ul>
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| 41 | <li class=fn><a href="#QDesktopWidget"><b>QDesktopWidget</b></a> ()</li>
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| 42 | <li class=fn><a href="#~QDesktopWidget"><b>~QDesktopWidget</b></a> ()</li>
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| 43 | <li class=fn>bool <a href="#isVirtualDesktop"><b>isVirtualDesktop</b></a> () const</li>
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| 44 | <li class=fn>int <a href="#numScreens"><b>numScreens</b></a> () const</li>
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| 45 | <li class=fn>int <a href="#primaryScreen"><b>primaryScreen</b></a> () const</li>
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| 46 | <li class=fn>int <a href="#screenNumber"><b>screenNumber</b></a> ( QWidget * widget = 0 ) const</li>
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| 47 | <li class=fn>int <a href="#screenNumber-2"><b>screenNumber</b></a> ( const QPoint & point ) const</li>
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| 48 | <li class=fn>QWidget * <a href="#screen"><b>screen</b></a> ( int screen = -1 )</li>
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| 49 | <li class=fn>const QRect & <a href="#screenGeometry"><b>screenGeometry</b></a> ( int screen = -1 ) const</li>
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| 50 | <li class=fn>const QRect & <a href="#screenGeometry-2"><b>screenGeometry</b></a> ( QWidget * widget ) const</li>
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| 51 | <li class=fn>const QRect & <a href="#screenGeometry-3"><b>screenGeometry</b></a> ( const QPoint & p ) const</li>
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| 52 | <li class=fn>const QRect & <a href="#availableGeometry"><b>availableGeometry</b></a> ( int screen = -1 ) const</li>
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| 53 | <li class=fn>const QRect & <a href="#availableGeometry-2"><b>availableGeometry</b></a> ( QWidget * widget ) const</li>
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| 54 | <li class=fn>const QRect & <a href="#availableGeometry-3"><b>availableGeometry</b></a> ( const QPoint & p ) const</li>
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| 55 | </ul>
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| 56 | <h2>Signals</h2>
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| 57 | <ul>
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| 58 | <li class=fn>void <a href="#resized"><b>resized</b></a> ( int screen )</li>
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| 59 | </ul>
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| 60 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 61 |
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| 62 |
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| 63 | The QDesktopWidget class provides access to screen information on multi-head systems.
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| 64 | <p>
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| 65 |
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| 66 | <p> Systems with more than one graphics card and monitor can manage the
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| 67 | physical screen space available either as multiple desktops, or as a
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| 68 | large virtual desktop, which usually has the size of the bounding
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| 69 | rectangle of all the screens (see <a href="#isVirtualDesktop">isVirtualDesktop</a>()). For an
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| 70 | application, one of the available screens is the primary screen, i.e.
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| 71 | the screen where the main widget resides (see <a href="#primaryScreen">primaryScreen</a>()). All
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| 72 | windows opened in the context of the application must be
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| 73 | constrained to the boundaries of the primary screen; for example,
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| 74 | it would be inconvenient if a dialog box popped up on a different
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| 75 | screen, or split over two screens.
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| 76 | <p> The QDesktopWidget provides information about the geometry of the
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| 77 | available screens with <a href="#screenGeometry">screenGeometry</a>(). The number of screens
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| 78 | available is returned by <a href="#numScreens">numScreens</a>(). The screen number that a
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| 79 | particular point or widget is located in is returned by
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| 80 | <a href="#screenNumber">screenNumber</a>().
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| 81 | <p> Widgets provided by Qt use this class, for example, to place
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| 82 | tooltips, menus and dialog boxes according to the parent or
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| 83 | application widget.
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| 84 | <p> Applications can use this class to save window positions, or to place
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| 85 | child widgets on one screen.
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| 86 | <p> <center><img src="qdesktopwidget.png" alt="Managing Multiple Screens"></center>
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| 87 | <p> In the illustration above, Application One's primary screen is
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| 88 | screen 0, and App Two's primary screen is screen 1.
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| 89 | <p> <p>See also <a href="advanced.html">Advanced Widgets</a> and <a href="environment.html">Environment Classes</a>.
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| 90 |
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| 91 | <hr><h2>Member Function Documentation</h2>
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| 92 | <h3 class=fn><a name="QDesktopWidget"></a>QDesktopWidget::QDesktopWidget ()
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| 93 | </h3>
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| 94 | Creates the desktop widget.
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| 95 | <p> If the system supports a virtual desktop, this widget will have
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| 96 | the size of the virtual desktop; otherwise this widget will have
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| 97 | the size of the primary screen.
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| 98 | <p> Instead of using QDesktopWidget directly, use
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| 99 | <a href="qapplication.html#desktop">QApplication::desktop</a>().
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| 100 |
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| 101 | <h3 class=fn><a name="~QDesktopWidget"></a>QDesktopWidget::~QDesktopWidget ()
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| 102 | </h3>
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| 103 | Destroy the object and free allocated resources.
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| 104 |
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| 105 | <h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="availableGeometry"></a>QDesktopWidget::availableGeometry ( int screen = -1 ) const
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| 106 | </h3>
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| 107 | Returns the available geometry of the screen with index <em>screen</em>. What
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| 108 | is available will be subrect of <a href="#screenGeometry">screenGeometry</a>() based on what the
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| 109 | platform decides is available (for example excludes the Dock and Menubar
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| 110 | on Mac OS X, or the taskbar on Windows).
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| 111 | <p> <p>See also <a href="#screenNumber">screenNumber</a>() and <a href="#screenGeometry">screenGeometry</a>().
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| 112 |
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| 113 | <h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="availableGeometry-2"></a>QDesktopWidget::availableGeometry ( <a href="qwidget.html">QWidget</a> * widget ) const
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| 114 | </h3>
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| 115 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 116 | <p> Returns the available geometry of the screen which contains <em>widget</em>.
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| 117 | <p> <p>See also <a href="#screenGeometry">screenGeometry</a>().
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| 118 |
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| 119 | <h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="availableGeometry-3"></a>QDesktopWidget::availableGeometry ( const <a href="qpoint.html">QPoint</a> & p ) const
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| 120 | </h3>
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| 121 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 122 | <p> Returns the available geometry of the screen which contains <em>p</em>.
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| 123 | <p> <p>See also <a href="#screenGeometry">screenGeometry</a>().
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| 124 |
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| 125 | <h3 class=fn>bool <a name="isVirtualDesktop"></a>QDesktopWidget::isVirtualDesktop () const
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| 126 | </h3>
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| 127 | Returns TRUE if the system manages the available screens in a
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| 128 | virtual desktop; otherwise returns FALSE.
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| 129 | <p> For virtual desktops, <a href="#screen">screen</a>() will always return the same widget.
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| 130 | The size of the virtual desktop is the size of this desktop
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| 131 | widget.
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| 132 |
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| 133 | <h3 class=fn>int <a name="numScreens"></a>QDesktopWidget::numScreens () const
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| 134 | </h3>
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| 135 | Returns the number of available screens.
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| 136 | <p> <p>See also <a href="#primaryScreen">primaryScreen</a>().
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| 137 |
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| 138 | <h3 class=fn>int <a name="primaryScreen"></a>QDesktopWidget::primaryScreen () const
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| 139 | </h3>
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| 140 | Returns the index of the primary screen.
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| 141 | <p> <p>See also <a href="#numScreens">numScreens</a>().
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| 142 |
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| 143 | <h3 class=fn>void <a name="resized"></a>QDesktopWidget::resized ( int screen )<tt> [signal]</tt>
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| 144 | </h3>
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| 145 | This signal is emitted when the size of <em>screen</em> changes.
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| 146 |
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| 147 | <h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="screen"></a>QDesktopWidget::screen ( int screen = -1 )
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| 148 | </h3>
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| 149 | Returns a widget that represents the screen with index <em>screen</em>.
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| 150 | This widget can be used to draw directly on the desktop, using an
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| 151 | unclipped painter like this:
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| 152 | <p> <pre>
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| 153 | <a href="qpainter.html">QPainter</a> paint( QApplication::<a href="qapplication.html#desktop">desktop</a>()->screen( 0 ), TRUE );
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| 154 | paint.draw...
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| 155 | ...
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| 156 | paint.<a href="qpainter.html#end">end</a>();
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| 157 | </pre>
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| 158 |
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| 159 | <p> If the system uses a virtual desktop, the returned widget will
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| 160 | have the geometry of the entire virtual desktop i.e. bounding
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| 161 | every <em>screen</em>.
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| 162 | <p> <p>See also <a href="#primaryScreen">primaryScreen</a>(), <a href="#numScreens">numScreens</a>(), and <a href="#isVirtualDesktop">isVirtualDesktop</a>().
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| 163 |
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| 164 | <h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="screenGeometry"></a>QDesktopWidget::screenGeometry ( int screen = -1 ) const
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| 165 | </h3>
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| 166 | Returns the geometry of the screen with index <em>screen</em>.
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| 167 | <p> <p>See also <a href="#screenNumber">screenNumber</a>().
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| 168 |
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| 169 | <h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="screenGeometry-2"></a>QDesktopWidget::screenGeometry ( <a href="qwidget.html">QWidget</a> * widget ) const
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| 170 | </h3>
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| 171 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 172 | <p> Returns the geometry of the screen which contains <em>widget</em>.
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| 173 |
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| 174 | <h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="screenGeometry-3"></a>QDesktopWidget::screenGeometry ( const <a href="qpoint.html">QPoint</a> & p ) const
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| 175 | </h3>
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| 176 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 177 | <p> Returns the geometry of the screen which contains <em>p</em>.
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| 178 |
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| 179 | <h3 class=fn>int <a name="screenNumber"></a>QDesktopWidget::screenNumber ( <a href="qwidget.html">QWidget</a> * widget = 0 ) const
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| 180 | </h3>
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| 181 | Returns the index of the screen that contains the largest
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| 182 | part of <em>widget</em>, or -1 if the widget not on a screen.
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| 183 | <p> <p>See also <a href="#primaryScreen">primaryScreen</a>().
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| 184 |
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| 185 | <h3 class=fn>int <a name="screenNumber-2"></a>QDesktopWidget::screenNumber ( const <a href="qpoint.html">QPoint</a> & point ) const
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| 186 | </h3>
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| 187 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 188 | <p> Returns the index of the screen that contains <em>point</em>, or -1 if
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| 189 | no screen contains the point.
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| 190 | <p> <p>See also <a href="#primaryScreen">primaryScreen</a>().
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| 191 |
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| 192 | <!-- eof -->
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| 193 | <hr><p>
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| 194 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 195 | Copyright © 1995-2007
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| 196 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 197 | <table width=100% cellspacing=0 border=0><tr>
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| 198 | <td>Copyright © 2007
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| 199 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 200 | <td align=right><div align=right>Qt 3.3.8</div>
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| 201 | </table></div></address></body>
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| 202 | </html>
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