src/motif/dcscreen.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/motif/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/dcscreen.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/utils.h"
  19     #include "wx/window.h"
  20     #include "wx/frame.h"
  21 #endif
  22
  23 #ifdef __VMS__
  24 #pragma message disable nosimpint
  25 #endif
  26 #include <Xm/Xm.h>
  27 #ifdef __VMS__
  28 #pragma message enable nosimpint
  29 #endif
  30
  31 #include "wx/motif/private.h"
  32
  33 IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
  34
  35 WXWindow wxScreenDC::sm_overlayWindow = 0;
  36 int wxScreenDC::sm_overlayWindowX = 0;
  37 int wxScreenDC::sm_overlayWindowY = 0;
  38
  39 // Create a DC representing the whole screen
  40 wxScreenDC::wxScreenDC()
  41 {
  42     m_display = wxGetDisplay();
  43     Display* display = (Display*) m_display;
  44
  45     if (sm_overlayWindow)
  46     {
  47         m_pixmap = sm_overlayWindow;
  48         m_deviceOriginX = - sm_overlayWindowX;
  49         m_deviceOriginY = - sm_overlayWindowY;
  50     }
  51     else
  52         m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));
  53
  54     XGCValues gcvalues;
  55     gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  56     gcvalues.background = WhitePixel (display, DefaultScreen (display));
  57     gcvalues.graphics_exposures = False;
  58     gcvalues.subwindow_mode = IncludeInferiors;
  59     gcvalues.line_width = 1;
  60     m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  61         GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
  62         &gcvalues);
  63
  64     m_backgroundPixel = gcvalues.background;
  65     m_ok = true;
  66 }
  67
  68 wxScreenDC::~wxScreenDC()
  69 {
  70     EndDrawingOnTop();
  71 }
  72
  73 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  74 {
  75     wxRect rect;
  76     int x, y, width, height;
  77     window->GetPosition(& x, & y);
  78     if (window->GetParent() && !window->IsKindOf(CLASSINFO(wxFrame)))
  79         window->GetParent()->ClientToScreen(& x, & y);
  80     window->GetSize(& width, & height);
  81     rect.x = x; rect.y = y;
  82     rect.width = width; rect.height = height;
  83
  84     return StartDrawingOnTop(& rect);
  85 }
  86
  87 bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
  88 {
  89     if (sm_overlayWindow)
  90         return false;
  91
  92     Display *dpy = (Display*) wxGetDisplay();
  93     Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  94
  95     int x = 0;
  96     int y = 0;
  97     int width, height;
  98     wxDisplaySize(&width, &height);
  99
 100     if (rect)
 101     {
 102         x = rect->x; y = rect->y;
 103         width = rect->width; height = rect->height;
 104     }
 105     sm_overlayWindowX = x;
 106     sm_overlayWindowY = y;
 107
 108     XSetWindowAttributes attributes;
 109     attributes.override_redirect = True;
 110     unsigned long valueMask = CWOverrideRedirect;
 111
 112     sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 113         wxDisplayDepth(), InputOutput,
 114         DefaultVisual(dpy, 0), valueMask,
 115         & attributes);
 116
 117     if (sm_overlayWindow)
 118     {
 119         XMapWindow(dpy, (Window) sm_overlayWindow);
 120         return true;
 121     }
 122     else
 123         return false;
 124 }
 125
 126 bool wxScreenDC::EndDrawingOnTop()
 127 {
 128     if (sm_overlayWindow)
 129     {
 130         XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 131         sm_overlayWindow = 0;
 132         return true;
 133     }
 134     else
 135         return false;
 136 }