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     MESSAGEQUEUE *pMsgQ = 0, *pCurMsgQ = 0;
  63     BOOL bRet = 0;
  64
  65     /* Get the messageQ for the current thread */
  66     if (!(pCurMsgQ = QUEUE_Current()))
  67     {
  68         WARN("\tCurrent message queue not found. Exiting!\n" );
  69         return 0;
  70     }
  71
  72     if (hwnd)
  73     {
  74         /* Check if we can set the focus to this window */
  75         WND *wndPtr;
  76
  77         hwnd = WIN_GetFullHandle( hwnd );
  78         for (;;)
  79         {
  80             HWND parent;
  81             LONG style = GetWindowLongW( hwndTop, GWL_STYLE );
  82             if (style & (WS_MINIMIZE | WS_DISABLED)) return 0;
  83             parent = GetAncestor( hwndTop, GA_PARENT );
  84             if (!parent || parent == GetDesktopWindow()) break;
  85             hwndTop = parent;
  86         }
  87
  88         if (!(wndPtr = WIN_FindWndPtr( hwndTop ))) return 0;
  89
  90         /* Retrieve the message queue associated with this window */
  91         pMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( wndPtr->hmemTaskQ );
  92         WIN_ReleaseWndPtr( wndPtr );
  93         if ( !pMsgQ )
  94         {
  95             WARN("\tMessage queue not found. Exiting!\n" );
  96             return 0;
  97         }
  98
  99         /* Make sure that message queue for the window we are setting focus to
 100          * shares the same perQ data as the current threads message queue.
 101          * In other words you can't set focus to a window owned by a different
 102          * thread unless AttachThreadInput has been called previously.
 103          * (see AttachThreadInput and SetFocus docs)
 104          */
 105         if ( pCurMsgQ->pQData != pMsgQ->pQData )
 106             goto CLEANUP;
 107
 108         /* Get the current focus window from the perQ data */
 109         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 110
 111         if( hwnd == hWndFocus )
 112         {
 113             bRet = 1;      /* Success */
 114             goto CLEANUP;  /* Nothing to do */
 115         }
 116
 117         /* call hooks */
 118         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (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_CallHooksA( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hWndFocus ) )
 138             return 0;
 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
 155     return bRet ? hWndFocus : 0;
 156 }
 157
 158
 159 /*****************************************************************
 160  *              GetFocus (USER.23)
 161  */
 162 HWND16 WINAPI GetFocus16(void)
 163 {
 164     return (HWND16)GetFocus();
 165 }
 166
 167
 168 /*****************************************************************
 169  *              GetFocus (USER32.@)
 170  */
 171 HWND WINAPI GetFocus(void)
 172 {
 173     MESSAGEQUEUE *pCurMsgQ = 0;
 174
 175     /* Get the messageQ for the current thread */
 176     if (!(pCurMsgQ = QUEUE_Current()))
 177     {
 178         WARN("\tCurrent message queue not found. Exiting!\n" );
 179         return 0;
 180     }
 181
 182     /* Get the current focus from the perQ data of the current message Q */
 183     return PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 184 }