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lightning-sunbird  0.9+nobinonly
nsScreenManagerOS2.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
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00015  * The Original Code is mozilla.org code.
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00019  * Portions created by the Initial Developer are Copyright (C) 2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Henry Sobotka <sobotka@axess.com>
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00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
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00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsScreenManagerOS2.h"
00040 #include "nsScreenOS2.h"
00041 
00042 
00043 nsScreenManagerOS2 :: nsScreenManagerOS2 ( )
00044 {
00045   // nothing else to do. I guess we could cache a bunch of information
00046   // here, but we want to ask the device at runtime in case anything
00047   // has changed.
00048 }
00049 
00050 
00051 nsScreenManagerOS2 :: ~nsScreenManagerOS2()
00052 {
00053   // nothing to see here.
00054 }
00055 
00056 
00057 // addref, release, QI
00058 NS_IMPL_ISUPPORTS1(nsScreenManagerOS2, nsIScreenManager)
00059 
00060 
00061 //
00062 // CreateNewScreenObject
00063 //
00064 // Utility routine. Creates a new screen object from the given device handle
00065 //
00066 // NOTE: For this "single-monitor" impl, we just always return the cached primary
00067 //        screen. This should change when a multi-monitor impl is done.
00068 //
00069 nsIScreen* 
00070 nsScreenManagerOS2 :: CreateNewScreenObject (  )
00071 {
00072   nsIScreen* retval = nsnull;
00073   if ( !mCachedMainScreen )
00074     mCachedMainScreen = new nsScreenOS2 ( );
00075   NS_IF_ADDREF(retval = mCachedMainScreen.get());
00076   
00077   return retval;
00078 }
00079 
00080 
00081 //
00082 // ScreenForRect 
00083 //
00084 // Returns the screen that contains the rectangle. If the rect overlaps
00085 // multiple screens, it picks the screen with the greatest area of intersection.
00086 //
00087 // The coordinates are in pixels (not twips) and in screen coordinates.
00088 //
00089 NS_IMETHODIMP
00090 nsScreenManagerOS2 :: ScreenForRect ( PRInt32 /*inLeft*/, PRInt32 /*inTop*/, PRInt32 /*inWidth*/,
00091                                        PRInt32 /*inHeight*/, nsIScreen **outScreen )
00092 {
00093   GetPrimaryScreen ( outScreen );
00094   return NS_OK;
00095     
00096 } // ScreenForRect
00097 
00098 
00099 //
00100 // GetPrimaryScreen
00101 //
00102 // The screen with the menubar/taskbar. This shouldn't be needed very
00103 // often.
00104 //
00105 NS_IMETHODIMP 
00106 nsScreenManagerOS2 :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen) 
00107 {
00108   *aPrimaryScreen = CreateNewScreenObject();    // addrefs  
00109   return NS_OK;
00110   
00111 } // GetPrimaryScreen
00112 
00113 
00114 //
00115 // GetNumberOfScreens
00116 //
00117 // Returns how many physical screens are available.
00118 //
00119 NS_IMETHODIMP
00120 nsScreenManagerOS2 :: GetNumberOfScreens(PRUint32 *aNumberOfScreens)
00121 {
00122   *aNumberOfScreens = 1;
00123   return NS_OK;
00124   
00125 } // GetNumberOfScreens
00126