widget/src/os2/nsScreenManagerOS2.cpp

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  38
  39 #include "nsScreenManagerOS2.h"
  40 #include "nsScreenOS2.h"
  41
  42
  43 nsScreenManagerOS2 :: nsScreenManagerOS2 ( )
  44 {
  45   // nothing else to do. I guess we could cache a bunch of information
  46   // here, but we want to ask the device at runtime in case anything
  47   // has changed.
  48 }
  49
  50
  51 nsScreenManagerOS2 :: ~nsScreenManagerOS2()
  52 {
  53   // nothing to see here.
  54 }
  55
  56
  57 // addref, release, QI
  58 NS_IMPL_ISUPPORTS1(nsScreenManagerOS2, nsIScreenManager)
  59
  60
  61 //
  62 // CreateNewScreenObject
  63 //
  64 // Utility routine. Creates a new screen object from the given device handle
  65 //
  66 // NOTE: For this "single-monitor" impl, we just always return the cached primary
  67 //        screen. This should change when a multi-monitor impl is done.
  68 //
  69 nsIScreen*
  70 nsScreenManagerOS2 :: CreateNewScreenObject (  )
  71 {
  72   nsIScreen* retval = nsnull;
  73   if ( !mCachedMainScreen )
  74     mCachedMainScreen = new nsScreenOS2 ( );
  75   NS_IF_ADDREF(retval = mCachedMainScreen.get());
  76
  77   return retval;
  78 }
  79
  80
  81 //
  82 // ScreenForRect
  83 //
  84 // Returns the screen that contains the rectangle. If the rect overlaps
  85 // multiple screens, it picks the screen with the greatest area of intersection.
  86 //
  87 // The coordinates are in pixels (not twips) and in screen coordinates.
  88 //
  89 NS_IMETHODIMP
  90 nsScreenManagerOS2 :: ScreenForRect ( PRInt32 /*inLeft*/, PRInt32 /*inTop*/, PRInt32 /*inWidth*/,
  91                                        PRInt32 /*inHeight*/, nsIScreen **outScreen )
  92 {
  93   GetPrimaryScreen ( outScreen );
  94   return NS_OK;
  95
  96 } // ScreenForRect
  97
  98
  99 //
 100 // GetPrimaryScreen
 101 //
 102 // The screen with the menubar/taskbar. This shouldn't be needed very
 103 // often.
 104 //
 105 NS_IMETHODIMP
 106 nsScreenManagerOS2 :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen)
 107 {
 108   *aPrimaryScreen = CreateNewScreenObject();    // addrefs
 109   return NS_OK;
 110
 111 } // GetPrimaryScreen
 112
 113
 114 //
 115 // GetNumberOfScreens
 116 //
 117 // Returns how many physical screens are available.
 118 //
 119 NS_IMETHODIMP
 120 nsScreenManagerOS2 :: GetNumberOfScreens(PRUint32 *aNumberOfScreens)
 121 {
 122   *aNumberOfScreens = 1;
 123   return NS_OK;
 124
 125 } // GetNumberOfScreens
 126
 127 NS_IMETHODIMP
 128 nsScreenManagerOS2 :: ScreenForNativeWidget(void *nativeWidget, nsIScreen **aScreen)
 129 {
 130   *aScreen = CreateNewScreenObject();    // addrefs
 131   return NS_OK;
 132 }