windows/focus.c

   1 /*
   2  * Focus functions
   3  *
   4  * Copyright 1993 David Metcalfe
   5  * Copyright 1994 Alexandre Julliard
   6  */
   7
   8 static char Copyright[] = "Copyright  David Metcalfe, 1993";
   9 static char Copyright2[] = "Copyright  Alexandre Julliard, 1994";
  10
  11 #include "win.h"
  12
  13 extern Colormap COLOR_WinColormap;
  14
  15 static HWND hWndFocus = 0;
  16
  17
  18 /*****************************************************************
  19  *               FOCUS_SetXFocus
  20  *
  21  * Set the X focus.
  22  */
  23 static void FOCUS_SetXFocus( HWND hwnd )
  24 {
  25     WND *wndPtr;
  26     XWindowAttributes win_attr;
  27
  28       /* Only mess with the X focus if there's no desktop window */
  29     if (rootWindow != DefaultRootWindow(display)) return;
  30
  31     if (!hwnd)  /* If setting the focus to 0, uninstall the colormap */
  32     {
  33         if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  34             XUninstallColormap( display, COLOR_WinColormap );
  35         return;
  36     }
  37
  38       /* Set X focus on the top-level ancestor. */
  39
  40       /* Find ancestor */
  41     wndPtr = WIN_FindWndPtr( hWndFocus );
  42     while (wndPtr && (wndPtr->dwStyle & WS_CHILD))
  43         wndPtr = WIN_FindWndPtr( wndPtr->hwndParent );
  44     if (!wndPtr) return;
  45
  46       /* Make sure window is viewable */
  47     if (!XGetWindowAttributes( display, wndPtr->window, &win_attr ) ||
  48         (win_attr.map_state != IsViewable)) return;
  49
  50       /* Set X focus and install colormap */
  51     XSetInputFocus( display, wndPtr->window, RevertToParent, CurrentTime );
  52     if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  53         XInstallColormap( display, COLOR_WinColormap );
  54 }
  55
  56
  57 /*****************************************************************
  58  *               SetFocus            (USER.22)
  59  */
  60
  61 HWND SetFocus(HWND hwnd)
  62 {
  63     HWND hWndPrevFocus, hwndParent;
  64     WND *wndPtr;
  65
  66     if (hwnd == hWndFocus) return hWndFocus;  /* Nothing to do! */
  67
  68     if (hwnd)
  69     {
  70           /* Check if we can set the focus to this window */
  71
  72         hwndParent = hwnd;
  73         while ((wndPtr = WIN_FindWndPtr( hwndParent )) != NULL)
  74         {
  75             if ((wndPtr->dwStyle & WS_MINIMIZE) ||
  76                 (wndPtr->dwStyle & WS_DISABLED)) return 0;
  77             if (!(wndPtr->dwStyle & WS_CHILD)) break;
  78             hwndParent = wndPtr->hwndParent;
  79         }
  80
  81           /* Now hwndParent is the top-level ancestor. Activate it. */
  82
  83         if (hwndParent != GetActiveWindow())
  84         {
  85             SetWindowPos( hwndParent, HWND_TOP, 0, 0, 0, 0,
  86                           SWP_NOSIZE | SWP_NOMOVE );
  87             if (!IsWindow( hwnd )) return 0;  /* Abort if window destroyed */
  88         }
  89     }
  90
  91       /* Change focus and send messages */
  92
  93     hWndPrevFocus = hWndFocus;
  94     hWndFocus = hwnd;
  95     if (hWndPrevFocus) SendMessage( hWndPrevFocus, WM_KILLFOCUS, hwnd, 0 );
  96     if (hwnd == hWndFocus)  /* Maybe already changed during WM_KILLFOCUS */
  97     {
  98         if (hwnd) SendMessage( hWndFocus, WM_SETFOCUS, hWndPrevFocus, 0 );
  99         FOCUS_SetXFocus( hwnd );
 100     }
 101     return hWndPrevFocus;
 102 }
 103
 104
 105 /*****************************************************************
 106  *               GetFocus            (USER.23)
 107  */
 108
 109 HWND GetFocus(void)
 110 {
 111     return hWndFocus;
 112 }
 113
 114