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