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lightning-sunbird  0.9+nobinonly
nsScreenManagerXlib.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Peter Hartshorn <peter@igelaus.com.au>
00024  *   Ken Faulkner <faulkner@igelaus.com.au>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either of the GNU General Public License Version 2 or later (the "GPL"),
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00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #include "nsScreenManagerXlib.h"
00041 #include "nsScreenXlib.h"
00042 
00043 
00044 nsScreenManagerXlib :: nsScreenManagerXlib ( )
00045 {
00046   // nothing else to do. I guess we could cache a bunch of information
00047   // here, but we want to ask the device at runtime in case anything
00048   // has changed.
00049 }
00050 
00051 
00052 nsScreenManagerXlib :: ~nsScreenManagerXlib()
00053 {
00054   // nothing to see here.
00055 }
00056 
00057 
00058 // addref, release, QI
00059 NS_IMPL_ISUPPORTS1(nsScreenManagerXlib, nsIScreenManager)
00060 
00061 
00062 //
00063 // CreateNewScreenObject
00064 //
00065 // Utility routine. Creates a new screen object from the given device handle
00066 //
00067 // NOTE: For this "single-monitor" impl, we just always return the cached primary
00068 //        screen. This should change when a multi-monitor impl is done.
00069 //
00070 nsIScreen* 
00071 nsScreenManagerXlib :: CreateNewScreenObject (  )
00072 {
00073   nsIScreen* retval = nsnull;
00074   if ( !mCachedMainScreen )
00075     mCachedMainScreen = new nsScreenXlib ( );
00076   NS_IF_ADDREF(retval = mCachedMainScreen.get());
00077   
00078   return retval;
00079 }
00080 
00081 
00082 //
00083 // ScreenForRect 
00084 //
00085 // Returns the screen that contains the rectangle. If the rect overlaps
00086 // multiple screens, it picks the screen with the greatest area of intersection.
00087 //
00088 // The coordinates are in pixels (not twips) and in screen coordinates.
00089 //
00090 NS_IMETHODIMP
00091 nsScreenManagerXlib :: ScreenForRect ( PRInt32 /*inLeft*/, PRInt32 /*inTop*/, PRInt32 /*inWidth*/,
00092                                        PRInt32 /*inHeight*/, nsIScreen **outScreen )
00093 {
00094   GetPrimaryScreen ( outScreen );
00095   return NS_OK;
00096     
00097 } // ScreenForRect
00098 
00099 
00100 //
00101 // GetPrimaryScreen
00102 //
00103 // The screen with the menubar/taskbar. This shouldn't be needed very
00104 // often.
00105 //
00106 NS_IMETHODIMP 
00107 nsScreenManagerXlib :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen) 
00108 {
00109   *aPrimaryScreen = CreateNewScreenObject();    // addrefs  
00110   return NS_OK;
00111   
00112 } // GetPrimaryScreen
00113 
00114 
00115 //
00116 // GetNumberOfScreens
00117 //
00118 // Returns how many physical screens are available.
00119 //
00120 NS_IMETHODIMP
00121 nsScreenManagerXlib :: GetNumberOfScreens(PRUint32 *aNumberOfScreens)
00122 {
00123   *aNumberOfScreens = 1;
00124   return NS_OK;
00125   
00126 } // GetNumberOfScreens
00127