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 "windef.h"
  11 #include "wingdi.h"
  12 #include "wine/winuser16.h"
  13 #include "win.h"
  14 #include "winpos.h"
  15 #include "hook.h"
  16 #include "message.h"
  17 #include "queue.h"
  18 #include "user.h"
  19 #include "debugtools.h"
  20
  21 DEFAULT_DEBUG_CHANNEL(win);
  22
  23
  24 /*****************************************************************
  25  *               FOCUS_SwitchFocus
  26  * pMsgQ is the queue whose perQData focus is to be modified
  27  */
  28 void FOCUS_SwitchFocus( MESSAGEQUEUE *pMsgQ, HWND hFocusFrom, HWND hFocusTo )
  29 {
  30     PERQDATA_SetFocusWnd( pMsgQ->pQData, hFocusTo );
  31
  32     if (hFocusFrom) SendMessageA( hFocusFrom, WM_KILLFOCUS, hFocusTo, 0 );
  33
  34     if( !hFocusTo || hFocusTo != PERQDATA_GetFocusWnd( pMsgQ->pQData ) )
  35     {
  36         return;
  37     }
  38
  39     /* According to API docs, the WM_SETFOCUS message is sent AFTER the window
  40        has received the keyboard focus. */
  41     if (USER_Driver.pSetFocus) USER_Driver.pSetFocus(hFocusTo);
  42
  43     SendMessageA( hFocusTo, WM_SETFOCUS, hFocusFrom, 0 );
  44 }
  45
  46
  47 /*****************************************************************
  48  *              SetFocus (USER.22)
  49  */
  50 HWND16 WINAPI SetFocus16( HWND16 hwnd )
  51 {
  52     return (HWND16)SetFocus( hwnd );
  53 }
  54
  55
  56 /*****************************************************************
  57  *              SetFocus (USER32.@)
  58  */
  59 HWND WINAPI SetFocus( HWND hwnd )
  60 {
  61     HWND hWndFocus = 0, hwndTop = hwnd;
  62     WND *wndPtr = WIN_FindWndPtr( hwnd );
  63     MESSAGEQUEUE *pMsgQ = 0, *pCurMsgQ = 0;
  64     BOOL16 bRet = 0;
  65
  66     /* Get the messageQ for the current thread */
  67     if (!(pCurMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( GetFastQueue16() )))
  68     {
  69         WARN("\tCurrent message queue not found. Exiting!\n" );
  70         goto CLEANUP;
  71     }
  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                  goto CLEANUP;
  81             WIN_UpdateWndPtr(&wndPtr,wndPtr->parent);
  82             if (!wndPtr) goto CLEANUP;
  83             hwndTop = wndPtr->hwndSelf;
  84         }
  85
  86         /* definitely at the top window now */
  87         if ( wndPtr->dwStyle & ( WS_MINIMIZE | WS_DISABLED) ) goto CLEANUP;
  88
  89         /* Retrieve the message queue associated with this window */
  90         pMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( wndPtr->hmemTaskQ );
  91         if ( !pMsgQ )
  92         {
  93             WARN("\tMessage queue not found. Exiting!\n" );
  94             goto CLEANUP;
  95         }
  96
  97         /* Make sure that message queue for the window we are setting focus to
  98          * shares the same perQ data as the current threads message queue.
  99          * In other words you can't set focus to a window owned by a different
 100          * thread unless AttachThreadInput has been called previously.
 101          * (see AttachThreadInput and SetFocus docs)
 102          */
 103         if ( pCurMsgQ->pQData != pMsgQ->pQData )
 104             goto CLEANUP;
 105
 106         /* Get the current focus window from the perQ data */
 107         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 108
 109         if( hwnd == hWndFocus )
 110         {
 111             bRet = 1;      /* Success */
 112             goto CLEANUP;  /* Nothing to do */
 113         }
 114
 115         /* call hooks */
 116         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (LPARAM)hWndFocus) )
 117             goto CLEANUP;
 118
 119         /* activate hwndTop if needed. */
 120         if (hwndTop != GetActiveWindow())
 121         {
 122             if (!WINPOS_SetActiveWindow(hwndTop, 0, 0)) goto CLEANUP;
 123
 124             if (!IsWindow( hwnd )) goto CLEANUP;  /* Abort if window destroyed */
 125         }
 126
 127         /* Get the current focus window from the perQ data */
 128         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 129
 130         /* Change focus and send messages */
 131         FOCUS_SwitchFocus( pMsgQ, hWndFocus, hwnd );
 132     }
 133     else /* NULL hwnd passed in */
 134     {
 135         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hWndFocus ) )
 136             goto CLEANUP;
 137
 138         /* Get the current focus from the perQ data of the current message Q */
 139         hWndFocus = PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 140
 141       /* Change focus and send messages */
 142         FOCUS_SwitchFocus( pCurMsgQ, hWndFocus, hwnd );
 143     }
 144
 145     bRet = 1;      /* Success */
 146
 147 CLEANUP:
 148
 149     /* Unlock the queues before returning */
 150     if ( pMsgQ )
 151         QUEUE_Unlock( pMsgQ );
 152     if ( pCurMsgQ )
 153         QUEUE_Unlock( pCurMsgQ );
 154
 155     WIN_ReleaseWndPtr(wndPtr);
 156     return bRet ? hWndFocus : 0;
 157 }
 158
 159
 160 /*****************************************************************
 161  *              GetFocus (USER.23)
 162  */
 163 HWND16 WINAPI GetFocus16(void)
 164 {
 165     return (HWND16)GetFocus();
 166 }
 167
 168
 169 /*****************************************************************
 170  *              GetFocus (USER32.@)
 171  */
 172 HWND WINAPI GetFocus(void)
 173 {
 174     MESSAGEQUEUE *pCurMsgQ = 0;
 175     HWND hwndFocus = 0;
 176
 177     /* Get the messageQ for the current thread */
 178     if (!(pCurMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( GetFastQueue16() )))
 179     {
 180         WARN("\tCurrent message queue not found. Exiting!\n" );
 181         return 0;
 182     }
 183
 184     /* Get the current focus from the perQ data of the current message Q */
 185     hwndFocus = PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 186
 187     QUEUE_Unlock( pCurMsgQ );
 188
 189     return hwndFocus;
 190 }