src/motif/dcscreen.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcscreen.cpp
   3 // Purpose:     wxScreenDC class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     17/09/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "dcscreen.h"
  14 #endif
  15
  16 #include "wx/dcscreen.h"
  17 #include "wx/utils.h"
  18
  19 #include <Xm/Xm.h>
  20
  21 #include <wx/motif/private.h>
  22
  23 #if !USE_SHARED_LIBRARY
  24 IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
  25 #endif
  26
  27 WXWindow wxScreenDC::sm_overlayWindow = 0;
  28 int wxScreenDC::sm_overlayWindowX = 0;
  29 int wxScreenDC::sm_overlayWindowY = 0;
  30
  31 // Create a DC representing the whole screen
  32 wxScreenDC::wxScreenDC()
  33 {
  34   m_display = wxGetDisplay();
  35   Display* display = (Display*) m_display;
  36
  37   if (sm_overlayWindow)
  38   {
  39     m_pixmap = sm_overlayWindow;
  40     m_deviceOriginX = - sm_overlayWindowX;
  41     m_deviceOriginY = - sm_overlayWindowY;
  42   }
  43   else
  44     m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));
  45
  46   XGCValues gcvalues;
  47   gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  48   gcvalues.background = WhitePixel (display, DefaultScreen (display));
  49   gcvalues.graphics_exposures = False;
  50   gcvalues.line_width = 1;
  51   m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  52             GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth,
  53                   &gcvalues);
  54
  55   m_backgroundPixel = (int) gcvalues.background;
  56   m_ok = TRUE;
  57 }
  58
  59 wxScreenDC::~wxScreenDC()
  60 {
  61 }
  62
  63 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  64 {
  65   wxRect rect;
  66   int x, y, width, height;
  67   window->GetPosition(& x, & y);
  68   window->ClientToScreen(& x, & y);
  69   window->GetSize(& width, & height);
  70   rect.x = x; rect.y = y;
  71   rect.width = width; rect.height = height;
  72
  73   return StartDrawingOnTop(& rect);
  74 }
  75
  76 bool wxScreenDC::StartDrawingOnTop(wxRect* rect = NULL)
  77 {
  78   if (sm_overlayWindow)
  79     return FALSE;
  80
  81   Display *dpy = (Display*) wxGetDisplay();
  82   Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  83
  84   int x = 0;
  85   int y = 0;
  86   int width, height;
  87   wxDisplaySize(&width, &height);
  88
  89   if (rect)
  90   {
  91     x = rect->x; y = rect->y;
  92     width = rect->width; height = rect->height;
  93   }
  94   sm_overlayWindowX = x;
  95   sm_overlayWindowY = y;
  96
  97   XSetWindowAttributes attributes;
  98   attributes.override_redirect = True;
  99   unsigned long valueMask = CWOverrideRedirect;
 100
 101   sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 102                          wxDisplayDepth(), InputOutput,
 103                          DefaultVisual(dpy, 0), valueMask,
 104                          & attributes);
 105
 106   if (sm_overlayWindow)
 107   {
 108     XMapWindow(dpy, (Window) sm_overlayWindow);
 109     return TRUE;
 110   }
 111   else
 112     return FALSE;
 113 }
 114
 115 bool wxScreenDC::EndDrawingOnTop()
 116 {
 117   if (sm_overlayWindow)
 118   {
 119     XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 120     sm_overlayWindow = 0;
 121     return TRUE;
 122   }
 123   else
 124     return FALSE;
 125 }