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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13 #pragma implementation "dcscreen.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #include "wx/window.h"
  20 #include "wx/frame.h"
  21 #include "wx/dcscreen.h"
  22 #include "wx/utils.h"
  23
  24 #ifdef __VMS__
  25 #pragma message disable nosimpint
  26 #endif
  27 #include <Xm/Xm.h>
  28 #ifdef __VMS__
  29 #pragma message enable nosimpint
  30 #endif
  31
  32 #include "wx/motif/private.h"
  33
  34 IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
  35
  36 WXWindow wxScreenDC::sm_overlayWindow = 0;
  37 int wxScreenDC::sm_overlayWindowX = 0;
  38 int wxScreenDC::sm_overlayWindowY = 0;
  39
  40 // Create a DC representing the whole screen
  41 wxScreenDC::wxScreenDC()
  42 {
  43     m_display = wxGetDisplay();
  44     Display* display = (Display*) m_display;
  45
  46     if (sm_overlayWindow)
  47     {
  48         m_pixmap = sm_overlayWindow;
  49         m_deviceOriginX = - sm_overlayWindowX;
  50         m_deviceOriginY = - sm_overlayWindowY;
  51     }
  52     else
  53         m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));
  54
  55     XGCValues gcvalues;
  56     gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  57     gcvalues.background = WhitePixel (display, DefaultScreen (display));
  58     gcvalues.graphics_exposures = False;
  59     gcvalues.subwindow_mode = IncludeInferiors;
  60     gcvalues.line_width = 1;
  61     m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  62         GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
  63         &gcvalues);
  64
  65     m_backgroundPixel = (int) gcvalues.background;
  66     m_ok = TRUE;
  67 }
  68
  69 wxScreenDC::~wxScreenDC()
  70 {
  71     EndDrawingOnTop();
  72 }
  73
  74 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  75 {
  76     wxRect rect;
  77     int x, y, width, height;
  78     window->GetPosition(& x, & y);
  79     if (window->GetParent() && !window->IsKindOf(CLASSINFO(wxFrame)))
  80         window->GetParent()->ClientToScreen(& x, & y);
  81     window->GetSize(& width, & height);
  82     rect.x = x; rect.y = y;
  83     rect.width = width; rect.height = height;
  84
  85     return StartDrawingOnTop(& rect);
  86 }
  87
  88 bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
  89 {
  90     if (sm_overlayWindow)
  91         return FALSE;
  92
  93     Display *dpy = (Display*) wxGetDisplay();
  94     Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  95
  96     int x = 0;
  97     int y = 0;
  98     int width, height;
  99     wxDisplaySize(&width, &height);
 100
 101     if (rect)
 102     {
 103         x = rect->x; y = rect->y;
 104         width = rect->width; height = rect->height;
 105     }
 106     sm_overlayWindowX = x;
 107     sm_overlayWindowY = y;
 108
 109     XSetWindowAttributes attributes;
 110     attributes.override_redirect = True;
 111     unsigned long valueMask = CWOverrideRedirect;
 112
 113     sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 114         wxDisplayDepth(), InputOutput,
 115         DefaultVisual(dpy, 0), valueMask,
 116         & attributes);
 117
 118     if (sm_overlayWindow)
 119     {
 120         XMapWindow(dpy, (Window) sm_overlayWindow);
 121         return TRUE;
 122     }
 123     else
 124         return FALSE;
 125 }
 126
 127 bool wxScreenDC::EndDrawingOnTop()
 128 {
 129     if (sm_overlayWindow)
 130     {
 131         XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 132         sm_overlayWindow = 0;
 133         return TRUE;
 134     }
 135     else
 136         return FALSE;
 137 }