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  * Explicit colormap management seems to work only with OLVWM.
  23  */
  24 static void FOCUS_SetXFocus( HWND hwnd )
  25 {
  26     XWindowAttributes win_attr;
  27     Window win;
  28
  29     /* Only mess with the X focus if there's */
  30     /* no desktop window and no window manager. */
  31     if ((rootWindow != DefaultRootWindow(display)) || Options.managed) return;
  32
  33     if (!hwnd)  /* If setting the focus to 0, uninstall the colormap */
  34     {
  35         if (COLOR_GetSystemPaletteFlags() & COLOR_PRIVATE)
  36             XUninstallColormap( display, COLOR_GetColormap() );
  37         return;
  38     }
  39
  40       /* Set X focus and install colormap */
  41
  42     if (!(win = WIN_GetXWindow( hwnd ))) return;
  43     if (!XGetWindowAttributes( display, win, &win_attr ) ||
  44         (win_attr.map_state != IsViewable))
  45         return;  /* If window is not viewable, don't change anything */
  46
  47     XSetInputFocus( display, win, RevertToParent, CurrentTime );
  48     if (COLOR_GetSystemPaletteFlags() & COLOR_PRIVATE)
  49         XInstallColormap( display, COLOR_GetColormap() );
  50 }
  51
  52 /*****************************************************************
  53  *               FOCUS_SwitchFocus
  54  */
  55 void FOCUS_SwitchFocus(HWND hFocusFrom, HWND hFocusTo)
  56 {
  57     hwndFocus = hFocusTo;
  58
  59     if (hFocusFrom) SendMessage16( hFocusFrom, WM_KILLFOCUS, (WPARAM)hFocusTo, 0L);
  60     if( !hFocusTo || hFocusTo != hwndFocus )
  61         return;
  62
  63     SendMessage16( hFocusTo, WM_SETFOCUS, (WPARAM)hFocusFrom, 0L);
  64     FOCUS_SetXFocus( hFocusTo );
  65 }
  66
  67
  68 /*****************************************************************
  69  *               SetFocus            (USER.22)
  70  */
  71 HWND SetFocus(HWND hwnd)
  72 {
  73     HWND hWndPrevFocus, hwndTop = hwnd;
  74     WND *wndPtr = WIN_FindWndPtr( hwnd );
  75
  76     if (wndPtr)
  77     {
  78           /* Check if we can set the focus to this window */
  79
  80         while ( (wndPtr->dwStyle & (WS_CHILD | WS_POPUP)) == WS_CHILD  )
  81         {
  82             if ( wndPtr->dwStyle & ( WS_MINIMIZE | WS_DISABLED) )
  83                  return 0;
  84             if (!(wndPtr = wndPtr->parent)) return 0;
  85             hwndTop = wndPtr->hwndSelf;
  86         }
  87
  88         if( hwnd == hwndFocus ) return hwnd;
  89
  90         /* call hooks */
  91         if( HOOK_CallHooks( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (LPARAM)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, (LPARAM)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