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 #include "options.h"
  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 */
  29     /* no desktop window and no window manager. */
  30     if ((rootWindow != DefaultRootWindow(display)) || Options.managed) return;
  31
  32     if (!hwnd)  /* If setting the focus to 0, uninstall the colormap */
  33     {
  34         if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  35             XUninstallColormap( display, COLOR_WinColormap );
  36         return;
  37     }
  38
  39       /* Set X focus and install colormap */
  40
  41     if (!(win = WIN_GetXWindow( hwnd ))) return;
  42     if (!XGetWindowAttributes( display, win, &win_attr ) ||
  43         (win_attr.map_state != IsViewable))
  44         return;  /* If window is not viewable, don't change anything */
  45     XSetInputFocus( display, win, RevertToParent, CurrentTime );
  46     if (COLOR_WinColormap != DefaultColormapOfScreen(screen))
  47         XInstallColormap( display, COLOR_WinColormap );
  48 }
  49
  50 /*****************************************************************
  51  *               FOCUS_SwitchFocus
  52  */
  53 void FOCUS_SwitchFocus(HWND hFocusFrom, HWND hFocusTo)
  54 {
  55     hwndFocus = hFocusTo;
  56
  57     if (hFocusFrom) SendMessage( hFocusFrom, WM_KILLFOCUS, (WPARAM)hFocusTo, 0L);
  58     if( !hFocusTo || hFocusTo != hwndFocus )
  59         return;
  60
  61     SendMessage( hFocusTo, WM_SETFOCUS, (WPARAM)hFocusFrom, 0L);
  62     FOCUS_SetXFocus( hFocusTo );
  63 }
  64
  65
  66 /*****************************************************************
  67  *               SetFocus            (USER.22)
  68  */
  69 HWND SetFocus(HWND hwnd)
  70 {
  71     HWND hWndPrevFocus, hwndTop;
  72     WND *wndPtr = WIN_FindWndPtr( hwndTop = hwnd );
  73
  74     if (wndPtr)
  75     {
  76           /* Check if we can set the focus to this window */
  77
  78         while ( (wndPtr->dwStyle & (WS_CHILD | WS_POPUP)) == WS_CHILD  )
  79         {
  80             if ( wndPtr->dwStyle & ( WS_MINIMIZE | WS_DISABLED) )
  81                  return 0;
  82
  83             hwndTop = wndPtr->hwndParent;
  84             wndPtr  = WIN_FindWndPtr( hwndTop );
  85             if ( !wndPtr )
  86                  return 0;
  87         }
  88
  89         if( hwnd == hwndFocus ) return hwnd;
  90
  91         /* call hooks */
  92         if( HOOK_CallHooks( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (LPARAM)hwndFocus) )
  93             return 0;
  94
  95         /* activate hwndTop if needed. */
  96         if (hwndTop != GetActiveWindow())
  97         {
  98             if (!WINPOS_SetActiveWindow(hwndTop, 0, 0)) return 0;
  99
 100             if (!IsWindow( hwnd )) return 0;  /* Abort if window destroyed */
 101         }
 102     }
 103     else if( HOOK_CallHooks( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hwndFocus ) )
 104              return 0;
 105
 106       /* Change focus and send messages */
 107     hWndPrevFocus = hwndFocus;
 108
 109     FOCUS_SwitchFocus( hwndFocus , hwnd );
 110
 111     return hWndPrevFocus;
 112 }
 113
 114
 115 /*****************************************************************
 116  *               GetFocus            (USER.23)
 117  */
 118 HWND GetFocus(void)
 119 {
 120     return hwndFocus;
 121 }
 122
 123