windows/focus.c

   1 /*
   2  * Focus functions
   3  *
   4  * Copyright 1993 David Metcalfe
   5  * Copyright 1994 Alexandre Julliard
   6  *
   7 static char Copyright[] = "Copyright  David Metcalfe, 1993";
   8 static char Copyright2[] = "Copyright  Alexandre Julliard, 1994";
   9 */
  10
  11 #include "win.h"
  12 #include "color.h"
  13
  14 static HWND hWndFocus = 0;
  15
  16 /*****************************************************************
  17  *               FOCUS_SetXFocus
  18  *
  19  * Set the X focus.
  20  */
  21 static void FOCUS_SetXFocus( HWND hwnd )
  22 {
  23     XWindowAttributes win_attr;
  24     Window win;
  25
  26       /* Only mess with the X focus if there's no desktop window */
  27     if (rootWindow != DefaultRootWindow(display)) return;
  28
  29     if (!hwnd)  /* If setting the focus to 0, uninstall the colormap */
  30     {
  31         if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  32             XUninstallColormap( display, COLOR_WinColormap );
  33         return;
  34     }
  35
  36       /* Set X focus and install colormap */
  37
  38     if (!(win = WIN_GetXWindow( hwnd ))) return;
  39     if (!XGetWindowAttributes( display, win, &win_attr ) ||
  40         (win_attr.map_state != IsViewable))
  41         return;  /* If window is not viewable, don't change anything */
  42     XSetInputFocus( display, win, RevertToParent, CurrentTime );
  43     if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  44         XInstallColormap( display, COLOR_WinColormap );
  45 }
  46
  47
  48 /*****************************************************************
  49  *               SetFocus            (USER.22)
  50  */
  51
  52 HWND SetFocus(HWND hwnd)
  53 {
  54     HWND hWndPrevFocus, hwndParent;
  55     WND *wndPtr;
  56
  57     if (hwnd == hWndFocus) return hWndFocus;  /* Nothing to do! */
  58
  59     if (hwnd)
  60     {
  61           /* Check if we can set the focus to this window */
  62
  63         hwndParent = hwnd;
  64         while ((wndPtr = WIN_FindWndPtr( hwndParent )) != NULL)
  65         {
  66             if ((wndPtr->dwStyle & WS_MINIMIZE) ||
  67                 (wndPtr->dwStyle & WS_DISABLED)) return 0;
  68             if (!(wndPtr->dwStyle & WS_CHILD)) break;
  69             hwndParent = wndPtr->hwndParent;
  70         }
  71
  72           /* Now hwndParent is the top-level ancestor. Activate it. */
  73
  74         if (hwndParent != GetActiveWindow())
  75         {
  76             SetWindowPos( hwndParent, HWND_TOP, 0, 0, 0, 0,
  77                           SWP_NOSIZE | SWP_NOMOVE );
  78             if (!IsWindow( hwnd )) return 0;  /* Abort if window destroyed */
  79         }
  80     }
  81
  82       /* Change focus and send messages */
  83
  84     hWndPrevFocus = hWndFocus;
  85     hWndFocus = hwnd;
  86     if (hWndPrevFocus) SendMessage( hWndPrevFocus, WM_KILLFOCUS, hwnd, 0 );
  87     if (hwnd == hWndFocus)  /* Maybe already changed during WM_KILLFOCUS */
  88     {
  89         if (hwnd) SendMessage( hWndFocus, WM_SETFOCUS, hWndPrevFocus, 0 );
  90         FOCUS_SetXFocus( hwnd );
  91     }
  92     return hWndPrevFocus;
  93 }
  94
  95
  96 /*****************************************************************
  97  *               GetFocus            (USER.23)
  98  */
  99
 100 HWND GetFocus(void)
 101 {
 102     return hWndFocus;
 103 }
 104
 105