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lightning-sunbird  0.9+nobinonly
nsScreenManagerPh.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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00037 
00038 #include "nsScreenManagerPh.h"
00039 #include "nsScreenPh.h"
00040 
00041 #include "nsPhGfxLog.h"
00042 
00043 nsScreenManagerPh :: nsScreenManagerPh( ) {
00044   // nothing else to do. I guess we could cache a bunch of information
00045   // here, but we want to ask the device at runtime in case anything
00046   // has changed.
00047        }
00048 
00049 
00050 nsScreenManagerPh :: ~nsScreenManagerPh( ) {
00051        }
00052 
00053 
00054 // addref, release, QI
00055 NS_IMPL_ISUPPORTS1(nsScreenManagerPh, nsIScreenManager)
00056 
00057 
00058 //
00059 // CreateNewScreenObject
00060 //
00061 // Utility routine. Creates a new screen object from the given device handle
00062 //
00063 // NOTE: For this "single-monitor" impl, we just always return the cached primary
00064 //        screen. This should change when a multi-monitor impl is done.
00065 //
00066 nsIScreen* nsScreenManagerPh :: CreateNewScreenObject( ) {
00067   nsIScreen* retval = nsnull;
00068   if( !mCachedMainScreen ) mCachedMainScreen = new nsScreenPh( );
00069   NS_IF_ADDREF(retval = mCachedMainScreen.get());
00070   return retval;
00071        }
00072 
00073 //
00074 // ScreenForRect 
00075 //
00076 // Returns the screen that contains the rectangle. If the rect overlaps
00077 // multiple screens, it picks the screen with the greatest area of intersection.
00078 //
00079 // The coordinates are in pixels (not twips) and in screen coordinates.
00080 //
00081 NS_IMETHODIMP nsScreenManagerPh :: ScreenForRect ( PRInt32 /*inLeft*/, PRInt32 /*inTop*/, PRInt32 /*inWidth*/, PRInt32 /*inHeight*/, nsIScreen **outScreen ) {
00082   GetPrimaryScreen( outScreen );
00083   return NS_OK;
00084        }
00085 
00086 //
00087 // GetPrimaryScreen
00088 //
00089 // The screen with the menubar/taskbar. This shouldn't be needed very
00090 // often.
00091 //
00092 NS_IMETHODIMP nsScreenManagerPh :: GetPrimaryScreen( nsIScreen * *aPrimaryScreen ) {
00093   *aPrimaryScreen = CreateNewScreenObject();    // addrefs  
00094   return NS_OK;
00095        }
00096 
00097 //
00098 // GetNumberOfScreens
00099 //
00100 // Returns how many physical screens are available.
00101 //
00102 NS_IMETHODIMP nsScreenManagerPh :: GetNumberOfScreens( PRUint32 *aNumberOfScreens ) {
00103   *aNumberOfScreens = 1;
00104   return NS_OK;
00105        }
00106