<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Graphics.UI.Gtk.Gdk.Screen</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/Graphics-UI-Gtk-Gdk-Screen.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">gtk-0.12.0: Binding to the Gtk+ graphical user interface library.</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>portable (depends on GHC)</td></tr><tr><th>Stability</th><td>provisional</td></tr><tr><th>Maintainer</th><td>gtk2hs-users@lists.sourceforge.net</td></tr></table><p class="caption">Graphics.UI.Gtk.Gdk.Screen</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">Detail
</a></li><li><a href="#g:2">Class Hierarchy
</a></li><li><a href="#g:3">Types
</a></li><li><a href="#g:4">Methods
</a></li><li><a href="#g:5">Attributes
</a></li><li><a href="#g:6">Signals
</a></li></ul></div><div id="description"><p class="caption">Description</p><div class="doc"><p>Object representing a physical screen
</p><ul><li> Module available since Gdk version 2.2
</li></ul></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">data</span> <a href="#t:Screen">Screen</a> </li><li class="src short"><span class="keyword">class</span> <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-GObject.html#t:GObjectClass">GObjectClass</a> o => <a href="#t:ScreenClass">ScreenClass</a> o </li><li class="src short"><a href="#v:castToScreen">castToScreen</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-GObject.html#t:GObjectClass">GObjectClass</a> obj => obj -> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></li><li class="src short"><a href="#v:gTypeScreen">gTypeScreen</a> :: <a href="Graphics-UI-Gtk-Abstract-Widget.html#t:GType">GType</a></li><li class="src short"><a href="#v:toScreen">toScreen</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> o => o -> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></li><li class="src short"><a href="#v:screenGetDefault">screenGetDefault</a> :: <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a>)</li><li class="src short"><a href="#v:screenGetSystemColormap">screenGetSystemColormap</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> Colormap</li><li class="src short"><a href="#v:screenGetRGBAColormap">screenGetRGBAColormap</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> Colormap)</li><li class="src short"><a href="#v:screenGetDefaultColormap">screenGetDefaultColormap</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> Colormap</li><li class="src short"><a href="#v:screenSetDefaultColormap">screenSetDefaultColormap</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> Colormap -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:screenIsComposited">screenIsComposited</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Bool.html#t:Bool">Bool</a></li><li class="src short"><a href="#v:screenGetRootWindow">screenGetRootWindow</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a></li><li class="src short"><a href="#v:screenGetDisplay">screenGetDisplay</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="Graphics-UI-Gtk-Gdk-Display.html#t:Display">Display</a></li><li class="src short"><a href="#v:screenGetNumber">screenGetNumber</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetWidth">screenGetWidth</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetHeight">screenGetHeight</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetWidthMm">screenGetWidthMm</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetHeightMm">screenGetHeightMm</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetWidthMM">screenGetWidthMM</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetHeightMM">screenGetHeightMM</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenListVisuals">screenListVisuals</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> [Visual]</li><li class="src short"><a href="#v:screenGetToplevelWindows">screenGetToplevelWindows</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> [<a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a>]</li><li class="src short"><a href="#v:screenMakeDisplayName">screenMakeDisplayName</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Char.html#t:String">String</a></li><li class="src short"><a href="#v:screenGetNMonitors">screenGetNMonitors</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetMonitorGeometry">screenGetMonitorGeometry</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="Graphics-UI-Gtk-Gdk-Events.html#t:Rectangle">Rectangle</a></li><li class="src short"><a href="#v:screenGetMonitorAtPoint">screenGetMonitorAtPoint</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetMonitorAtWindow">screenGetMonitorAtWindow</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetMonitorHeightMm">screenGetMonitorHeightMm</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetMonitorWidthMm">screenGetMonitorWidthMm</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:screenGetMonitorPlugName">screenGetMonitorPlugName</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Char.html#t:String">String</a>)</li><li class="src short"><a href="#v:screenGetActiveWindow">screenGetActiveWindow</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a>)</li><li class="src short"><a href="#v:screenGetWindowStack">screenGetWindowStack</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> [<a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a>])</li><li class="src short"><a href="#v:screenFontOptions">screenFontOptions</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Attributes.html#t:Attr">Attr</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="/usr/share/doc/ghc/html/libraries/cairo-0.12.0/Graphics-Rendering-Cairo.html#t:FontOptions">FontOptions</a>)</li><li class="src short"><a href="#v:screenResolution">screenResolution</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Attributes.html#t:Attr">Attr</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Prelude.html#t:Double">Double</a></li><li class="src short"><a href="#v:screenDefaultColormap">screenDefaultColormap</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Attributes.html#t:Attr">Attr</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> Colormap</li><li class="src short"><a href="#v:screenSizeChanged">screenSizeChanged</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> self => <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Signals.html#t:Signal">Signal</a> self (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a>)</li><li class="src short"><a href="#v:screenCompositedChanged">screenCompositedChanged</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> self => <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Signals.html#t:Signal">Signal</a> self (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a>)</li><li class="src short"><a href="#v:screenMonitorsChanged">screenMonitorsChanged</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> self => <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Signals.html#t:Signal">Signal</a> self (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a>)</li></ul></div><div id="interface"><h1 id="g:1">Detail
</h1><div class="doc"><p><code><a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></code> objects are the GDK representation of a physical screen. It is
used throughout GDK and Gtk+ to specify which screen the top level windows
are to be displayed on. It is also used to query the screen specification
and default settings such as the default colormap
(<code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenGetDefaultColormap">screenGetDefaultColormap</a></code>), the screen width (<code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenGetWidth">screenGetWidth</a></code>), etc.
</p><p>Note that a screen may consist of multiple monitors which are merged to
form a large screen area.
</p></div><h1 id="g:2">Class Hierarchy
</h1><div class="doc"><pre>
| <code><a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-GObject.html#t:GObject">GObject</a></code>
| +----Screen
</pre></div><h1 id="g:3">Types
</h1><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:Screen" class="def">Screen</a> <a href="src/Graphics-UI-Gtk-Types.html#Screen" class="link">Source</a></p><div class="subs instances"><p id="control.i:Screen" class="caption collapser" onclick="toggleSection('i:Screen')">Instances</p><div id="section.i:Screen" class="show"><table><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Eq.html#t:Eq">Eq</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Ord.html#t:Ord">Ord</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-GObject.html#t:GObjectClass">GObjectClass</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span> <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-GObject.html#t:GObjectClass">GObjectClass</a> o => <a name="t:ScreenClass" class="def">ScreenClass</a> o <a href="src/Graphics-UI-Gtk-Types.html#ScreenClass" class="link">Source</a></p><div class="subs instances"><p id="control.i:ScreenClass" class="caption collapser" onclick="toggleSection('i:ScreenClass')">Instances</p><div id="section.i:ScreenClass" class="show"><table><tr><td class="src"><a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:castToScreen" class="def">castToScreen</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-GObject.html#t:GObjectClass">GObjectClass</a> obj => obj -> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a><a href="src/Graphics-UI-Gtk-Types.html#castToScreen" class="link">Source</a></p></div><div class="top"><p class="src"><a name="v:gTypeScreen" class="def">gTypeScreen</a> :: <a href="Graphics-UI-Gtk-Abstract-Widget.html#t:GType">GType</a><a href="src/Graphics-UI-Gtk-Types.html#gTypeScreen" class="link">Source</a></p></div><div class="top"><p class="src"><a name="v:toScreen" class="def">toScreen</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> o => o -> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a><a href="src/Graphics-UI-Gtk-Types.html#toScreen" class="link">Source</a></p></div><h1 id="g:4">Methods
</h1><div class="top"><p class="src"><a name="v:screenGetDefault" class="def">screenGetDefault</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetDefault" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a>)</td><td class="doc"><p>returns a <code><a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></code>, or <code>Nothing</code> if there is no
default display.
</p></td></tr></table></div><div class="doc"><p>Gets the default screen for the default display. (See
<code>displayGetDefault</code>).
</p></div></div><div class="top"><p class="src"><a name="v:screenGetSystemColormap" class="def">screenGetSystemColormap</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetSystemColormap" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> Colormap</td><td class="doc"><p>returns the default colormap for <code>screen</code>.
</p></td></tr></table></div><div class="doc"><p>Gets the system default colormap for <code>screen</code>
</p></div></div><div class="top"><p class="src"><a name="v:screenGetRGBAColormap" class="def">screenGetRGBAColormap</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetRGBAColormap" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> Colormap)</td><td class="doc"><p>returns a colormap to use for windows with an
alpha channel or <code>Nothing</code> if the capability is not
available.
</p></td></tr></table></div><div class="doc"><p>Gets a colormap to use for creating windows or pixmaps with an alpha
channel. The windowing system on which Gtk+ is running may not support this
capability, in which case <code>Nothing</code> will be returned. Even if a
non-<code>Nothing</code> value is returned, its possible that the window's alpha
channel won't be honored when displaying the window on the screen: in
particular, for X an appropriate windowing manager and compositing manager
must be running to provide appropriate display.
</p><ul><li> Available since Gdk version 2.8
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenGetDefaultColormap" class="def">screenGetDefaultColormap</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetDefaultColormap" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> Colormap</td><td class="doc"><p>returns the default <code>Colormap</code>.
</p></td></tr></table></div></div><div class="top"><p class="src"><a name="v:screenSetDefaultColormap" class="def">screenSetDefaultColormap</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenSetDefaultColormap" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> Colormap</td><td class="doc"><p><code>colormap</code> - a <code>Colormap</code>
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a></td><td class="doc empty"> </td></tr></table></div></div><div class="top"><p class="src"><a name="v:screenIsComposited" class="def">screenIsComposited</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenIsComposited" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Bool.html#t:Bool">Bool</a></td><td class="doc"><p>returns Whether windows with RGBA visuals can reasonably be
expected to have their alpha channels drawn correctly on the
screen.
</p></td></tr></table></div><div class="doc"><p>Returns whether windows with an RGBA visual can reasonably be expected to
have their alpha channel drawn correctly on the screen.
</p><p>On X11 this function returns whether a compositing manager is compositing
<code>screen</code>.
</p><ul><li> Available since Gdk version 2.10
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenGetRootWindow" class="def">screenGetRootWindow</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetRootWindow" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a></td><td class="doc"><p>returns the root window
</p></td></tr></table></div><div class="doc"><p>Gets the root window of <code>screen</code>.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetDisplay" class="def">screenGetDisplay</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetDisplay" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="Graphics-UI-Gtk-Gdk-Display.html#t:Display">Display</a></td><td class="doc"><p>returns the display to which <code>screen</code> belongs
</p></td></tr></table></div><div class="doc"><p>Gets the display to which the <code>screen</code> belongs.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetNumber" class="def">screenGetNumber</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetNumber" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the index
</p></td></tr></table></div><div class="doc"><p>Gets the index of <code>screen</code> among the screens in the display to which it
belongs. (See <code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenGetDisplay">screenGetDisplay</a></code>)
</p></div></div><div class="top"><p class="src"><a name="v:screenGetWidth" class="def">screenGetWidth</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetWidth" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the width of <code>screen</code> in pixels.
</p></td></tr></table></div><div class="doc"><p>Gets the width of <code>screen</code> in pixels
</p></div></div><div class="top"><p class="src"><a name="v:screenGetHeight" class="def">screenGetHeight</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetHeight" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the height of <code>screen</code> in pixels.
</p></td></tr></table></div><div class="doc"><p>Gets the height of <code>screen</code> in pixels
</p></div></div><div class="top"><p class="src"><a name="v:screenGetWidthMm" class="def">screenGetWidthMm</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetWidthMm" class="link">Source</a></p></div><div class="top"><p class="src"><a name="v:screenGetHeightMm" class="def">screenGetHeightMm</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> -> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetHeightMm" class="link">Source</a></p></div><div class="top"><p class="src"><a name="v:screenGetWidthMM" class="def">screenGetWidthMM</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetWidthMM" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the width of <code>screen</code> in millimeters.
</p></td></tr></table></div><div class="doc"><p>Gets the width of <code>screen</code> in millimeters. Note that on some X servers
this value will not be correct.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetHeightMM" class="def">screenGetHeightMM</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetHeightMM" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the heigth of <code>screen</code> in millimeters.
</p></td></tr></table></div><div class="doc"><p>Returns the height of <code>screen</code> in millimeters. Note that on some X
servers this value will not be correct.
</p></div></div><div class="top"><p class="src"><a name="v:screenListVisuals" class="def">screenListVisuals</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenListVisuals" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> [Visual]</td><td class="doc"><p>returns a list of visuals
</p></td></tr></table></div><div class="doc"><p>Lists the available visuals for the specified <code>screen</code>. A visual
describes a hardware image data format. For example, a visual might support
24-bit color, or 8-bit color, and might expect pixels to be in a certain
format.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetToplevelWindows" class="def">screenGetToplevelWindows</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetToplevelWindows" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> [<a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a>]</td><td class="doc"><p>returns list of toplevel windows
</p></td></tr></table></div><div class="doc"><p>Obtains a list of all toplevel windows known to GDK on the screen
<code>screen</code>. A toplevel window is a child of the root window (see
<code>getDefaultRootWindow</code>).
</p></div></div><div class="top"><p class="src"><a name="v:screenMakeDisplayName" class="def">screenMakeDisplayName</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenMakeDisplayName" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Char.html#t:String">String</a></td><td class="doc"><p>returns a newly allocated string
</p></td></tr></table></div><div class="doc"><p>Determines the name to pass to <code>displayOpen</code> to get a <code><a href="Graphics-UI-Gtk-Gdk-Display.html#t:Display">Display</a></code> with this
screen as the default screen.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetNMonitors" class="def">screenGetNMonitors</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetNMonitors" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns number of monitors which <code>screen</code> consists of.
</p></td></tr></table></div><div class="doc"><p>Returns the number of monitors which <code>screen</code> consists of.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetMonitorGeometry" class="def">screenGetMonitorGeometry</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetMonitorGeometry" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p><code>monitorNum</code> - the monitor number.
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="Graphics-UI-Gtk-Gdk-Events.html#t:Rectangle">Rectangle</a></td><td class="doc empty"> </td></tr></table></div><div class="doc"><p>Retrieves the <code><a href="Graphics-UI-Gtk-Gdk-Events.html#t:Rectangle">Rectangle</a></code> representing the size and
position of the individual monitor within the entire screen area.
</p><p>Note that the size of the entire screen area can be retrieved via
<code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenGetWidth">screenGetWidth</a></code> and <code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenGetHeight">screenGetHeight</a></code>.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetMonitorAtPoint" class="def">screenGetMonitorAtPoint</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetMonitorAtPoint" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p><code>x</code> - the x coordinate in the virtual screen.
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p><code>y</code> - the y coordinate in the virtual screen.
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the monitor number in which the point (<code>x</code>,<code>y</code>) lies,
or a monitor close to (<code>x</code>,<code>y</code>) if the point is not in any
monitor.
</p></td></tr></table></div><div class="doc"><p>Returns the monitor number in which the point (<code>x</code>,<code>y</code>) is located.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetMonitorAtWindow" class="def">screenGetMonitorAtWindow</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetMonitorAtWindow" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a></td><td class="doc"><p><code>window</code> - a <code><a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a></code>
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the monitor number in which most of <code>window</code> is
located, or if <code>window</code> does not intersect any monitors, a
monitor, close to <code>window</code>.
</p></td></tr></table></div><div class="doc"><p>Returns the number of the monitor in which the largest area of the
bounding rectangle of <code>window</code> resides.
</p></div></div><div class="top"><p class="src"><a name="v:screenGetMonitorHeightMm" class="def">screenGetMonitorHeightMm</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetMonitorHeightMm" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p><code>monitorNum</code> - number of the monitor
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the height of the monitor, or -1 if not available
</p></td></tr></table></div><div class="doc"><p>Gets the height in millimeters of the specified monitor.
</p><ul><li> Available since Gdk version 2.14
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenGetMonitorWidthMm" class="def">screenGetMonitorWidthMm</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetMonitorWidthMm" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p><code>monitorNum</code> - number of the monitor
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p>returns the width of the monitor, or -1 if not available
</p></td></tr></table></div><div class="doc"><p>Gets the width in millimeters of the specified monitor, if available.
</p><ul><li> Available since Gdk version 2.14
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenGetMonitorPlugName" class="def">screenGetMonitorPlugName</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetMonitorPlugName" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Int.html#t:Int">Int</a></td><td class="doc"><p><code>monitorNum</code> - number of the monitor
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Char.html#t:String">String</a>)</td><td class="doc"><p>returns a newly-allocated string containing the name of the
monitor, or <code>Nothing</code> if the name cannot be determined
</p></td></tr></table></div><div class="doc"><p>Returns the output name of the specified monitor. Usually something like
VGA, DVI, or TV, not the actual product name of the display device.
</p><ul><li> Available since Gdk version 2.14
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenGetActiveWindow" class="def">screenGetActiveWindow</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetActiveWindow" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a>)</td><td class="doc"><p>returns the currently active window, or
<code>Nothing</code>.
</p></td></tr></table></div><div class="doc"><p>Returns the currently active window of this screen.
</p><p>On X11, this is done by inspecting the _NET_ACTIVE_WINDOW property on the
root window, as described in the Extended Window Manager Hints. If there is
no currently currently active window, or the window manager does not support
the _NET_ACTIVE_WINDOW hint, this function returns <code>Nothing</code>.
</p><p>On other platforms, this function may return <code>Nothing</code>, depending on whether
it is implementable on that platform.
</p><ul><li> Available since Gdk version 2.10
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenGetWindowStack" class="def">screenGetWindowStack</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenGetWindowStack" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> [<a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a>])</td><td class="doc"><p>returns a list of <code><a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a></code>s for the
current window stack, or <code>Nothing</code>.
</p></td></tr></table></div><div class="doc"><p>Returns a list of <code><a href="Graphics-UI-Gtk-Gdk-DrawWindow.html#t:DrawWindow">DrawWindow</a></code>s representing the
current window stack.
</p><p>On X11, this is done by inspecting the _NET_CLIENT_LIST_STACKING property
on the root window, as described in the Extended Window Manager Hints. If
the window manager does not support the _NET_CLIENT_LIST_STACKING hint, this
function returns <code>Nothing</code>.
</p><p>On other platforms, this function may return <code>Nothing</code>, depending on whether it is
implementable on that platform.
</p><ul><li> Available since Gdk version 2.10
</li></ul></div></div><h1 id="g:5">Attributes
</h1><div class="top"><p class="src"><a name="v:screenFontOptions" class="def">screenFontOptions</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Attributes.html#t:Attr">Attr</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="/usr/share/doc/ghc/html/libraries/cairo-0.12.0/Graphics-Rendering-Cairo.html#t:FontOptions">FontOptions</a>)<a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenFontOptions" class="link">Source</a></p><div class="doc"><p>The default font options for the screen.
</p></div></div><div class="top"><p class="src"><a name="v:screenResolution" class="def">screenResolution</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Attributes.html#t:Attr">Attr</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> <a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/Prelude.html#t:Double">Double</a><a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenResolution" class="link">Source</a></p><div class="doc"><p>The resolution for fonts on the screen.
</p><p>Default value: -1
</p></div></div><div class="top"><p class="src"><a name="v:screenDefaultColormap" class="def">screenDefaultColormap</a> :: <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Attributes.html#t:Attr">Attr</a> <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:Screen">Screen</a> Colormap<a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenDefaultColormap" class="link">Source</a></p><div class="doc"><p>Sets the default <code>colormap</code> for <code>screen</code>.
</p><p>Gets the default colormap for <code>screen</code>.
</p></div></div><h1 id="g:6">Signals
</h1><div class="top"><p class="src"><a name="v:screenSizeChanged" class="def">screenSizeChanged</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> self => <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Signals.html#t:Signal">Signal</a> self (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a>)<a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenSizeChanged" class="link">Source</a></p><div class="doc"><p>The ::size_changed signal is emitted when the pixel width or height of a
screen changes.
</p></div></div><div class="top"><p class="src"><a name="v:screenCompositedChanged" class="def">screenCompositedChanged</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> self => <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Signals.html#t:Signal">Signal</a> self (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a>)<a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenCompositedChanged" class="link">Source</a></p><div class="doc"><p>The <code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenCompositedChanged">screenCompositedChanged</a></code> signal is emitted when the composited status of
the screen changes
</p><ul><li> Available since Gdk version 2.10
</li></ul></div></div><div class="top"><p class="src"><a name="v:screenMonitorsChanged" class="def">screenMonitorsChanged</a> :: <a href="Graphics-UI-Gtk-Gdk-Screen.html#t:ScreenClass">ScreenClass</a> self => <a href="/usr/share/doc/ghc/html/libraries/glib-0.12.0/System-Glib-Signals.html#t:Signal">Signal</a> self (<a href="/usr/share/doc/ghc/html/libraries/base-4.3.1.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t:-40--41-">()</a>)<a href="src/Graphics-UI-Gtk-Gdk-Screen.html#screenMonitorsChanged" class="link">Source</a></p><div class="doc"><p>The <code><a href="Graphics-UI-Gtk-Gdk-Screen.html#v:screenMonitorsChanged">screenMonitorsChanged</a></code> signal is emitted when the number, size or
position of the monitors attached to the screen change.
</p><p>Only for X for now. Future implementations for Win32 and OS X may be a
possibility.
</p><ul><li> Available since Gdk version 2.14
</li></ul></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.9.2</p></div></body></html>
