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/window.h"
  17 #include "wx/dcscreen.h"
  18 #include "wx/utils.h"
  19
  20 #include <Xm/Xm.h>
  21
  22 #include <wx/motif/private.h>
  23
  24 #if !USE_SHARED_LIBRARY
  25 IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
  26 #endif
  27
  28 WXWindow wxScreenDC::sm_overlayWindow = 0;
  29 int wxScreenDC::sm_overlayWindowX = 0;
  30 int wxScreenDC::sm_overlayWindowY = 0;
  31
  32 // Create a DC representing the whole screen
  33 wxScreenDC::wxScreenDC()
  34 {
  35     m_display = wxGetDisplay();
  36     Display* display = (Display*) m_display;
  37
  38     if (sm_overlayWindow)
  39     {
  40         m_pixmap = sm_overlayWindow;
  41         m_deviceOriginX = - sm_overlayWindowX;
  42         m_deviceOriginY = - sm_overlayWindowY;
  43     }
  44     else
  45         m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));
  46
  47     XGCValues gcvalues;
  48     gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  49     gcvalues.background = WhitePixel (display, DefaultScreen (display));
  50     gcvalues.graphics_exposures = False;
  51     gcvalues.subwindow_mode = IncludeInferiors;
  52     gcvalues.line_width = 1;
  53     m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  54         GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
  55         &gcvalues);
  56
  57     m_backgroundPixel = (int) gcvalues.background;
  58     m_ok = TRUE;
  59 }
  60
  61 wxScreenDC::~wxScreenDC()
  62 {
  63 }
  64
  65 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  66 {
  67     wxRect rect;
  68     int x, y, width, height;
  69     window->GetPosition(& x, & y);
  70     if (window->GetParent())
  71         window->GetParent()->ClientToScreen(& x, & y);
  72     window->GetSize(& width, & height);
  73     rect.x = x; rect.y = y;
  74     rect.width = width; rect.height = height;
  75
  76     return StartDrawingOnTop(& rect);
  77 }
  78
  79 bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
  80 {
  81     if (sm_overlayWindow)
  82         return FALSE;
  83
  84     Display *dpy = (Display*) wxGetDisplay();
  85     Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  86
  87     int x = 0;
  88     int y = 0;
  89     int width, height;
  90     wxDisplaySize(&width, &height);
  91
  92     if (rect)
  93     {
  94         x = rect->x; y = rect->y;
  95         width = rect->width; height = rect->height;
  96     }
  97     sm_overlayWindowX = x;
  98     sm_overlayWindowY = y;
  99
 100     XSetWindowAttributes attributes;
 101     attributes.override_redirect = True;
 102     unsigned long valueMask = CWOverrideRedirect;
 103
 104     sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 105         wxDisplayDepth(), InputOutput,
 106         DefaultVisual(dpy, 0), valueMask,
 107         & attributes);
 108
 109     if (sm_overlayWindow)
 110     {
 111         XMapWindow(dpy, (Window) sm_overlayWindow);
 112         return TRUE;
 113     }
 114     else
 115         return FALSE;
 116 }
 117
 118 bool wxScreenDC::EndDrawingOnTop()
 119 {
 120     if (sm_overlayWindow)
 121     {
 122         XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 123         sm_overlayWindow = 0;
 124         return TRUE;
 125     }
 126     else
 127         return FALSE;
 128 }