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 "message.h"
  14 #include "task.h"
  15 #include "debug.h"
  16
  17
  18 /*****************************************************************
  19  *               FOCUS_SwitchFocus
  20  * pMsgQ is the queue whose perQData focus is to be modified
  21  */
  22 void FOCUS_SwitchFocus( MESSAGEQUEUE *pMsgQ, HWND hFocusFrom, HWND hFocusTo )
  23 {
  24     WND *pFocusTo = WIN_FindWndPtr( hFocusTo );
  25
  26     PERQDATA_SetFocusWnd( pMsgQ->pQData, hFocusTo );
  27
  28 #if 0
  29     if (hFocusFrom) SendMessageA( hFocusFrom, WM_KILLFOCUS, hFocusTo, 0 );
  30 #else
  31     /* FIXME: must be SendMessage16() because 32A doesn't do
  32      * intertask at this time */
  33     if (hFocusFrom) SendMessage16( hFocusFrom, WM_KILLFOCUS, hFocusTo, 0 );
  34 #endif
  35
  36     if( !pFocusTo || hFocusTo != PERQDATA_GetFocusWnd( pMsgQ->pQData ) )
  37     {
  38         WIN_ReleaseWndPtr(pFocusTo);
  39         return;
  40     }
  41
  42     /* According to API docs, the WM_SETFOCUS message is sent AFTER the window
  43        has received the keyboard focus. */
  44
  45     pFocusTo->pDriver->pSetFocus(pFocusTo);
  46
  47     WIN_ReleaseWndPtr(pFocusTo);
  48 #if 0
  49     SendMessageA( hFocusTo, WM_SETFOCUS, hFocusFrom, 0 );
  50 #else
  51     SendMessage16( hFocusTo, WM_SETFOCUS, hFocusFrom, 0 );
  52 #endif
  53 }
  54
  55
  56 /*****************************************************************
  57  *               SetFocus16   (USER.22)
  58  */
  59 HWND16 WINAPI SetFocus16( HWND16 hwnd )
  60 {
  61     return (HWND16)SetFocus( hwnd );
  62 }
  63
  64
  65 /*****************************************************************
  66  *               SetFocus32   (USER32.481)
  67  */
  68 HWND WINAPI SetFocus( HWND hwnd )
  69 {
  70     HWND hWndFocus = 0, hwndTop = hwnd;
  71     WND *wndPtr = WIN_FindWndPtr( hwnd );
  72     MESSAGEQUEUE *pMsgQ = 0, *pCurMsgQ = 0;
  73     BOOL16 bRet = 0;
  74
  75     /* Get the messageQ for the current thread */
  76     if (!(pCurMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( GetFastQueue16() )))
  77     {
  78         WARN( win, "\tCurrent message queue not found. Exiting!\n" );
  79         goto CLEANUP;
  80     }
  81
  82     if (wndPtr)
  83     {
  84           /* Check if we can set the focus to this window */
  85
  86         while ( (wndPtr->dwStyle & (WS_CHILD | WS_POPUP)) == WS_CHILD  )
  87         {
  88             if ( wndPtr->dwStyle & ( WS_MINIMIZE | WS_DISABLED) )
  89                  goto CLEANUP;
  90             WIN_UpdateWndPtr(&wndPtr,wndPtr->parent);
  91             if (!wndPtr) goto CLEANUP;
  92             hwndTop = wndPtr->hwndSelf;
  93         }
  94
  95         /* Retrieve the message queue associated with this window */
  96         pMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( wndPtr->hmemTaskQ );
  97         if ( !pMsgQ )
  98         {
  99             WARN( win, "\tMessage queue not found. Exiting!\n" );
 100             goto CLEANUP;
 101         }
 102
 103         /* Make sure that message queue for the window we are setting focus to
 104          * shares the same perQ data as the current threads message queue.
 105          * In other words you can't set focus to a window owned by a different
 106          * thread unless AttachThreadInput has been called previously.
 107          * (see AttachThreadInput and SetFocus docs)
 108          */
 109         if ( pCurMsgQ->pQData != pMsgQ->pQData )
 110             goto CLEANUP;
 111
 112         /* Get the current focus window from the perQ data */
 113         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 114
 115         if( hwnd == hWndFocus )
 116         {
 117             bRet = 1;      // Success
 118             goto CLEANUP;  // Nothing to do
 119         }
 120
 121         /* call hooks */
 122         if( HOOK_CallHooks16( WH_CBT, HCBT_SETFOCUS, (WPARAM16)hwnd,
 123                               (LPARAM)hWndFocus) )
 124             goto CLEANUP;
 125
 126         /* activate hwndTop if needed. */
 127         if (hwndTop != GetActiveWindow())
 128         {
 129             if (!WINPOS_SetActiveWindow(hwndTop, 0, 0)) goto CLEANUP;
 130
 131             if (!IsWindow( hwnd )) goto CLEANUP;  /* Abort if window destroyed */
 132         }
 133
 134         /* Get the current focus window from the perQ data */
 135         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 136
 137         /* Change focus and send messages */
 138         FOCUS_SwitchFocus( pMsgQ, hWndFocus, hwnd );
 139     }
 140     else /* NULL hwnd passed in */
 141     {
 142         if( HOOK_CallHooks16( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hWndFocus ) )
 143             goto CLEANUP;
 144
 145         /* Get the current focus from the perQ data of the current message Q */
 146         hWndFocus = PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 147
 148       /* Change focus and send messages */
 149         FOCUS_SwitchFocus( pCurMsgQ, hWndFocus, hwnd );
 150     }
 151
 152     bRet = 1;      // Success
 153
 154 CLEANUP:
 155
 156     /* Unlock the queues before returning */
 157     if ( pMsgQ )
 158         QUEUE_Unlock( pMsgQ );
 159     if ( pCurMsgQ )
 160         QUEUE_Unlock( pCurMsgQ );
 161
 162     WIN_ReleaseWndPtr(wndPtr);
 163     return bRet ? hWndFocus : 0;
 164 }
 165
 166
 167 /*****************************************************************
 168  *               GetFocus16   (USER.23)
 169  */
 170 HWND16 WINAPI GetFocus16(void)
 171 {
 172     return (HWND16)GetFocus();
 173 }
 174
 175
 176 /*****************************************************************
 177  *               GetFocus32   (USER32.240)
 178  */
 179 HWND WINAPI GetFocus(void)
 180 {
 181     MESSAGEQUEUE *pCurMsgQ = 0;
 182     HWND hwndFocus = 0;
 183
 184     /* Get the messageQ for the current thread */
 185     if (!(pCurMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( GetFastQueue16() )))
 186     {
 187         WARN( win, "\tCurrent message queue not found. Exiting!\n" );
 188         return 0;
 189     }
 190
 191     /* Get the current focus from the perQ data of the current message Q */
 192     hwndFocus = PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 193
 194     QUEUE_Unlock( pCurMsgQ );
 195
 196     return hwndFocus;
 197 }