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.subwindow_mode = IncludeInferiors;
  51     gcvalues.line_width = 1;
  52     m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  53         GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
  54         &gcvalues);
  55
  56     m_backgroundPixel = (int) gcvalues.background;
  57     m_ok = TRUE;
  58 }
  59
  60 wxScreenDC::~wxScreenDC()
  61 {
  62 }
  63
  64 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  65 {
  66     wxRect rect;
  67     int x, y, width, height;
  68     window->GetPosition(& x, & y);
  69     if (window->GetParent())
  70         window->GetParent()->ClientToScreen(& x, & y);
  71     window->GetSize(& width, & height);
  72     rect.x = x; rect.y = y;
  73     rect.width = width; rect.height = height;
  74
  75     return StartDrawingOnTop(& rect);
  76 }
  77
  78 bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
  79 {
  80     if (sm_overlayWindow)
  81         return FALSE;
  82
  83     Display *dpy = (Display*) wxGetDisplay();
  84     Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  85
  86     int x = 0;
  87     int y = 0;
  88     int width, height;
  89     wxDisplaySize(&width, &height);
  90
  91     if (rect)
  92     {
  93         x = rect->x; y = rect->y;
  94         width = rect->width; height = rect->height;
  95     }
  96     sm_overlayWindowX = x;
  97     sm_overlayWindowY = y;
  98
  99     XSetWindowAttributes attributes;
 100     attributes.override_redirect = True;
 101     unsigned long valueMask = CWOverrideRedirect;
 102
 103     sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 104         wxDisplayDepth(), InputOutput,
 105         DefaultVisual(dpy, 0), valueMask,
 106         & attributes);
 107
 108     if (sm_overlayWindow)
 109     {
 110         XMapWindow(dpy, (Window) sm_overlayWindow);
 111         return TRUE;
 112     }
 113     else
 114         return FALSE;
 115 }
 116
 117 bool wxScreenDC::EndDrawingOnTop()
 118 {
 119     if (sm_overlayWindow)
 120     {
 121         XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 122         sm_overlayWindow = 0;
 123         return TRUE;
 124     }
 125     else
 126         return FALSE;
 127 }