widget/src/windows/nsScreenWin.cpp

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  37
  38 //
  39 // We have to do this in order to have access to the multiple-monitor
  40 // APIs that are only defined when WINVER is >= 0x0500. Don't worry,
  41 // these won't actually be called unless they are present.
  42 //
  43 #undef WINVER
  44 #define WINVER 0x0500
  45 #undef _WIN32_WINNT
  46 #define _WIN32_WINNT 0x0500
  47
  48 #include "nsScreenWin.h"
  49
  50
  51
  52
  53 nsScreenWin :: nsScreenWin ( void* inScreen )
  54   : mScreen(inScreen)
  55 {
  56 #ifdef DEBUG
  57   HDC hDCScreen = ::GetDC(nsnull);
  58   NS_ASSERTION(hDCScreen,"GetDC Failure");
  59   NS_ASSERTION ( ::GetDeviceCaps(hDCScreen, TECHNOLOGY) == DT_RASDISPLAY, "Not a display screen");
  60   ::ReleaseDC(nsnull,hDCScreen);
  61 #endif
  62
  63   // nothing else to do. I guess we could cache a bunch of information
  64   // here, but we want to ask the device at runtime in case anything
  65   // has changed.
  66 }
  67
  68
  69 nsScreenWin :: ~nsScreenWin()
  70 {
  71   // nothing to see here.
  72 }
  73
  74
  75 // addref, release, QI
  76 NS_IMPL_ISUPPORTS1(nsScreenWin, nsIScreen)
  77
  78
  79 NS_IMETHODIMP
  80 nsScreenWin :: GetRect(PRInt32 *outLeft, PRInt32 *outTop, PRInt32 *outWidth, PRInt32 *outHeight)
  81 {
  82   BOOL success = FALSE;
  83 #if _MSC_VER >= 1200
  84   if ( mScreen ) {
  85     MONITORINFO info;
  86     info.cbSize = sizeof(MONITORINFO);
  87     success = ::GetMonitorInfoW( (HMONITOR)mScreen, &info );
  88     if ( success ) {
  89       *outLeft = info.rcMonitor.left;
  90       *outTop = info.rcMonitor.top;
  91       *outWidth = info.rcMonitor.right - info.rcMonitor.left;
  92       *outHeight = info.rcMonitor.bottom - info.rcMonitor.top;
  93     }
  94   }
  95 #endif
  96   if (!success) {
  97      HDC hDCScreen = ::GetDC(nsnull);
  98      NS_ASSERTION(hDCScreen,"GetDC Failure");
  99
 100      *outTop = *outLeft = 0;
 101      *outWidth = ::GetDeviceCaps(hDCScreen, HORZRES);
 102      *outHeight = ::GetDeviceCaps(hDCScreen, VERTRES);
 103
 104      ::ReleaseDC(nsnull, hDCScreen);
 105   }
 106   return NS_OK;
 107
 108 } // GetRect
 109
 110
 111 NS_IMETHODIMP
 112 nsScreenWin :: GetAvailRect(PRInt32 *outLeft, PRInt32 *outTop, PRInt32 *outWidth, PRInt32 *outHeight)
 113 {
 114   BOOL success = FALSE;
 115 #if _MSC_VER >= 1200
 116   if ( mScreen ) {
 117     MONITORINFO info;
 118     info.cbSize = sizeof(MONITORINFO);
 119     success = ::GetMonitorInfoW( (HMONITOR)mScreen, &info );
 120     if ( success ) {
 121       *outLeft = info.rcWork.left;
 122       *outTop = info.rcWork.top;
 123       *outWidth = info.rcWork.right - info.rcWork.left;
 124       *outHeight = info.rcWork.bottom - info.rcWork.top;
 125     }
 126   }
 127 #endif
 128   if (!success) {
 129     RECT workArea;
 130     ::SystemParametersInfo(SPI_GETWORKAREA, 0, &workArea, 0);
 131     *outLeft = workArea.left;
 132     *outTop = workArea.top;
 133     *outWidth = workArea.right - workArea.left;
 134     *outHeight = workArea.bottom - workArea.top;
 135   }
 136
 137   return NS_OK;
 138
 139 } // GetAvailRect
 140
 141
 142
 143 NS_IMETHODIMP
 144 nsScreenWin :: GetPixelDepth(PRInt32 *aPixelDepth)
 145 {
 146   //XXX not sure how to get this info for multiple monitors, this might be ok...
 147   HDC hDCScreen = ::GetDC(nsnull);
 148   NS_ASSERTION(hDCScreen,"GetDC Failure");
 149
 150   *aPixelDepth = ::GetDeviceCaps(hDCScreen, BITSPIXEL);
 151
 152   ::ReleaseDC(nsnull, hDCScreen);
 153   return NS_OK;
 154
 155 } // GetPixelDepth
 156
 157
 158 NS_IMETHODIMP
 159 nsScreenWin :: GetColorDepth(PRInt32 *aColorDepth)
 160 {
 161   return GetPixelDepth(aColorDepth);
 162
 163 } // GetColorDepth
 164
 165