windows/focus.c

   1 /*
   2  * Focus functions
   3  *
   4  * Copyright 1993 David Metcalfe
   5  *           1994 Alexandre Julliard
   6  *           1995 Alex Korobka
   7  *
   8  */
   9
  10 #include "win.h"
  11 #include "winpos.h"
  12 #include "hook.h"
  13 #include "color.h"
  14
  15
  16 static HWND hwndFocus = 0;
  17
  18 /*****************************************************************
  19  *               FOCUS_SetXFocus
  20  *
  21  * Set the X focus.
  22  */
  23 static void FOCUS_SetXFocus( HWND hwnd )
  24 {
  25     XWindowAttributes win_attr;
  26     Window win;
  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 and install colormap */
  39
  40     if (!(win = WIN_GetXWindow( hwnd ))) return;
  41     if (!XGetWindowAttributes( display, win, &win_attr ) ||
  42         (win_attr.map_state != IsViewable))
  43         return;  /* If window is not viewable, don't change anything */
  44     XSetInputFocus( display, win, RevertToParent, CurrentTime );
  45     if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  46         XInstallColormap( display, COLOR_WinColormap );
  47 }
  48
  49 /*****************************************************************
  50  *               FOCUS_SwitchFocus
  51  */
  52 void FOCUS_SwitchFocus(HWND hFocusFrom, HWND hFocusTo)
  53 {
  54     hwndFocus = hFocusTo;
  55
  56     if (hFocusFrom) SendMessage( hFocusFrom, WM_KILLFOCUS, hFocusTo, 0L);
  57     if( !hFocusTo || hFocusTo != hwndFocus )
  58         return;
  59
  60     SendMessage( hFocusTo, WM_SETFOCUS, hFocusFrom, 0L);
  61     FOCUS_SetXFocus( hFocusTo );
  62 }
  63
  64
  65 /*****************************************************************
  66  *               SetFocus            (USER.22)
  67  */
  68 HWND SetFocus(HWND hwnd)
  69 {
  70     HWND hWndPrevFocus, hwndTop;
  71     WND *wndPtr = WIN_FindWndPtr( hwndTop = hwnd );
  72
  73     if (wndPtr)
  74     {
  75           /* Check if we can set the focus to this window */
  76
  77         while ( (wndPtr->dwStyle & (WS_CHILD | WS_POPUP)) == WS_CHILD  )
  78         {
  79             if ( wndPtr->dwStyle & ( WS_MINIMIZE | WS_DISABLED) )
  80                  return 0;
  81
  82             hwndTop = wndPtr->hwndParent;
  83             wndPtr  = WIN_FindWndPtr( hwndTop );
  84             if ( !wndPtr )
  85                  return 0;
  86         }
  87
  88         if( hwnd == hwndFocus ) return hwnd;
  89
  90         /* call hooks */
  91         if( HOOK_CallHooks( WH_CBT, HCBT_SETFOCUS, hwnd, hwndFocus) )
  92             return 0;
  93
  94         /* activate hwndTop if needed. */
  95         if (hwndTop != GetActiveWindow())
  96         {
  97             if (!WINPOS_SetActiveWindow(hwndTop, 0, 0)) return 0;
  98
  99             if (!IsWindow( hwnd )) return 0;  /* Abort if window destroyed */
 100         }
 101     }
 102     else if( HOOK_CallHooks( WH_CBT, HCBT_SETFOCUS, 0, hwndFocus ) )
 103              return 0;
 104
 105       /* Change focus and send messages */
 106     hWndPrevFocus = hwndFocus;
 107
 108     FOCUS_SwitchFocus( hwndFocus , hwnd );
 109
 110     return hWndPrevFocus;
 111 }
 112
 113
 114 /*****************************************************************
 115  *               GetFocus            (USER.23)
 116  */
 117 HWND GetFocus(void)
 118 {
 119     return hwndFocus;
 120 }
 121
 122