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 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #include "wx/window.h"
  16 #include "wx/frame.h"
  17 #include "wx/dcscreen.h"
  18 #include "wx/utils.h"
  19
  20 #ifdef __VMS__
  21 #pragma message disable nosimpint
  22 #endif
  23 #include <Xm/Xm.h>
  24 #ifdef __VMS__
  25 #pragma message enable nosimpint
  26 #endif
  27
  28 #include "wx/motif/private.h"
  29
  30 IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
  31
  32 WXWindow wxScreenDC::sm_overlayWindow = 0;
  33 int wxScreenDC::sm_overlayWindowX = 0;
  34 int wxScreenDC::sm_overlayWindowY = 0;
  35
  36 // Create a DC representing the whole screen
  37 wxScreenDC::wxScreenDC()
  38 {
  39     m_display = wxGetDisplay();
  40     Display* display = (Display*) m_display;
  41
  42     if (sm_overlayWindow)
  43     {
  44         m_pixmap = sm_overlayWindow;
  45         m_deviceOriginX = - sm_overlayWindowX;
  46         m_deviceOriginY = - sm_overlayWindowY;
  47     }
  48     else
  49         m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));
  50
  51     XGCValues gcvalues;
  52     gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  53     gcvalues.background = WhitePixel (display, DefaultScreen (display));
  54     gcvalues.graphics_exposures = False;
  55     gcvalues.subwindow_mode = IncludeInferiors;
  56     gcvalues.line_width = 1;
  57     m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  58         GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
  59         &gcvalues);
  60
  61     m_backgroundPixel = (int) gcvalues.background;
  62     m_ok = true;
  63 }
  64
  65 wxScreenDC::~wxScreenDC()
  66 {
  67     EndDrawingOnTop();
  68 }
  69
  70 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  71 {
  72     wxRect rect;
  73     int x, y, width, height;
  74     window->GetPosition(& x, & y);
  75     if (window->GetParent() && !window->IsKindOf(CLASSINFO(wxFrame)))
  76         window->GetParent()->ClientToScreen(& x, & y);
  77     window->GetSize(& width, & height);
  78     rect.x = x; rect.y = y;
  79     rect.width = width; rect.height = height;
  80
  81     return StartDrawingOnTop(& rect);
  82 }
  83
  84 bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
  85 {
  86     if (sm_overlayWindow)
  87         return false;
  88
  89     Display *dpy = (Display*) wxGetDisplay();
  90     Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  91
  92     int x = 0;
  93     int y = 0;
  94     int width, height;
  95     wxDisplaySize(&width, &height);
  96
  97     if (rect)
  98     {
  99         x = rect->x; y = rect->y;
 100         width = rect->width; height = rect->height;
 101     }
 102     sm_overlayWindowX = x;
 103     sm_overlayWindowY = y;
 104
 105     XSetWindowAttributes attributes;
 106     attributes.override_redirect = True;
 107     unsigned long valueMask = CWOverrideRedirect;
 108
 109     sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 110         wxDisplayDepth(), InputOutput,
 111         DefaultVisual(dpy, 0), valueMask,
 112         & attributes);
 113
 114     if (sm_overlayWindow)
 115     {
 116         XMapWindow(dpy, (Window) sm_overlayWindow);
 117         return true;
 118     }
 119     else
 120         return false;
 121 }
 122
 123 bool wxScreenDC::EndDrawingOnTop()
 124 {
 125     if (sm_overlayWindow)
 126     {
 127         XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 128         sm_overlayWindow = 0;
 129         return true;
 130     }
 131     else
 132         return false;
 133 }