src/x11/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/frame.h"
  18 #include "wx/dcscreen.h"
  19 #include "wx/utils.h"
  20
  21 #ifdef __VMS__
  22 #pragma message disable nosimpint
  23 #endif
  24
  25 #ifdef __VMS__
  26 #pragma message enable nosimpint
  27 #endif
  28
  29 #include "wx/x11/private.h"
  30
  31 IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
  32
  33 WXWindow wxScreenDC::sm_overlayWindow = 0;
  34 int wxScreenDC::sm_overlayWindowX = 0;
  35 int wxScreenDC::sm_overlayWindowY = 0;
  36
  37 // Create a DC representing the whole screen
  38 wxScreenDC::wxScreenDC()
  39 {
  40     m_display = wxGetDisplay();
  41     Display* display = (Display*) m_display;
  42
  43     if (sm_overlayWindow)
  44     {
  45         m_pixmap = sm_overlayWindow;
  46         m_deviceOriginX = - sm_overlayWindowX;
  47         m_deviceOriginY = - sm_overlayWindowY;
  48     }
  49     else
  50         m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));
  51
  52     XGCValues gcvalues;
  53     gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  54     gcvalues.background = WhitePixel (display, DefaultScreen (display));
  55     gcvalues.graphics_exposures = False;
  56     gcvalues.subwindow_mode = IncludeInferiors;
  57     gcvalues.line_width = 1;
  58     m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
  59         GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
  60         &gcvalues);
  61
  62     m_backgroundPixel = (int) gcvalues.background;
  63     m_ok = TRUE;
  64 }
  65
  66 wxScreenDC::~wxScreenDC()
  67 {
  68     EndDrawingOnTop();
  69 }
  70
  71 bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
  72 {
  73     wxRect rect;
  74     int x, y, width, height;
  75     window->GetPosition(& x, & y);
  76     if (window->GetParent() && !window->IsKindOf(CLASSINFO(wxFrame)))
  77         window->GetParent()->ClientToScreen(& x, & y);
  78     window->GetSize(& width, & height);
  79     rect.x = x; rect.y = y;
  80     rect.width = width; rect.height = height;
  81
  82     return StartDrawingOnTop(& rect);
  83 }
  84
  85 bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
  86 {
  87     if (sm_overlayWindow)
  88         return FALSE;
  89
  90     Display *dpy = (Display*) wxGetDisplay();
  91     Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
  92
  93     int x = 0;
  94     int y = 0;
  95     int width, height;
  96     wxDisplaySize(&width, &height);
  97
  98     if (rect)
  99     {
 100         x = rect->x; y = rect->y;
 101         width = rect->width; height = rect->height;
 102     }
 103     sm_overlayWindowX = x;
 104     sm_overlayWindowY = y;
 105
 106     XSetWindowAttributes attributes;
 107     attributes.override_redirect = True;
 108     unsigned long valueMask = CWOverrideRedirect;
 109
 110     sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
 111         wxDisplayDepth(), InputOutput,
 112         DefaultVisual(dpy, 0), valueMask,
 113         & attributes);
 114
 115     if (sm_overlayWindow)
 116     {
 117         XMapWindow(dpy, (Window) sm_overlayWindow);
 118         return TRUE;
 119     }
 120     else
 121         return FALSE;
 122 }
 123
 124 bool wxScreenDC::EndDrawingOnTop()
 125 {
 126     if (sm_overlayWindow)
 127     {
 128         XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
 129         sm_overlayWindow = 0;
 130         return TRUE;
 131     }
 132     else
 133         return FALSE;
 134 }