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, (WPARAM)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, (WPARAM)hFocusFrom, 0 );
  44 }
  45
  46
  47 /*****************************************************************
  48  *              SetFocus (USER32.@)
  49  */
  50 HWND WINAPI SetFocus( HWND hwnd )
  51 {
  52     HWND hWndFocus = 0, hwndTop = hwnd;
  53     MESSAGEQUEUE *pMsgQ = 0, *pCurMsgQ = 0;
  54     BOOL bRet = 0;
  55
  56     /* Get the messageQ for the current thread */
  57     if (!(pCurMsgQ = QUEUE_Current()))
  58     {
  59         WARN("\tCurrent message queue not found. Exiting!\n" );
  60         return 0;
  61     }
  62
  63     if (hwnd)
  64     {
  65         /* Check if we can set the focus to this window */
  66         WND *wndPtr;
  67
  68         hwnd = WIN_GetFullHandle( hwnd );
  69         for (;;)
  70         {
  71             HWND parent;
  72             LONG style = GetWindowLongW( hwndTop, GWL_STYLE );
  73             if (style & (WS_MINIMIZE | WS_DISABLED)) return 0;
  74             parent = GetAncestor( hwndTop, GA_PARENT );
  75             if (!parent || parent == GetDesktopWindow()) break;
  76             hwndTop = parent;
  77         }
  78
  79         if (!(wndPtr = WIN_FindWndPtr( hwndTop ))) return 0;
  80
  81         /* Retrieve the message queue associated with this window */
  82         pMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( wndPtr->hmemTaskQ );
  83         WIN_ReleaseWndPtr( wndPtr );
  84         if ( !pMsgQ )
  85         {
  86             WARN("\tMessage queue not found. Exiting!\n" );
  87             return 0;
  88         }
  89
  90         /* Make sure that message queue for the window we are setting focus to
  91          * shares the same perQ data as the current threads message queue.
  92          * In other words you can't set focus to a window owned by a different
  93          * thread unless AttachThreadInput has been called previously.
  94          * (see AttachThreadInput and SetFocus docs)
  95          */
  96         if ( pCurMsgQ->pQData != pMsgQ->pQData )
  97             goto CLEANUP;
  98
  99         /* Get the current focus window from the perQ data */
 100         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 101
 102         if( hwnd == hWndFocus )
 103         {
 104             bRet = 1;      /* Success */
 105             goto CLEANUP;  /* Nothing to do */
 106         }
 107
 108         /* call hooks */
 109         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (LPARAM)hWndFocus) )
 110             goto CLEANUP;
 111
 112         /* activate hwndTop if needed. */
 113         if (hwndTop != GetActiveWindow())
 114         {
 115             if (!WINPOS_SetActiveWindow(hwndTop, 0, 0)) goto CLEANUP;
 116
 117             if (!IsWindow( hwnd )) goto CLEANUP;  /* Abort if window destroyed */
 118         }
 119
 120         /* Get the current focus window from the perQ data */
 121         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 122
 123         /* Change focus and send messages */
 124         FOCUS_SwitchFocus( pMsgQ, hWndFocus, hwnd );
 125     }
 126     else /* NULL hwnd passed in */
 127     {
 128         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hWndFocus ) )
 129             return 0;
 130
 131         /* Get the current focus from the perQ data of the current message Q */
 132         hWndFocus = PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 133
 134       /* Change focus and send messages */
 135         FOCUS_SwitchFocus( pCurMsgQ, hWndFocus, hwnd );
 136     }
 137
 138     bRet = 1;      /* Success */
 139
 140 CLEANUP:
 141
 142     /* Unlock the queues before returning */
 143     if ( pMsgQ )
 144         QUEUE_Unlock( pMsgQ );
 145
 146     return bRet ? hWndFocus : 0;
 147 }
 148
 149
 150 /*****************************************************************
 151  *              GetFocus (USER32.@)
 152  */
 153 HWND WINAPI GetFocus(void)
 154 {
 155     MESSAGEQUEUE *pCurMsgQ = 0;
 156
 157     /* Get the messageQ for the current thread */
 158     if (!(pCurMsgQ = QUEUE_Current()))
 159     {
 160         WARN("\tCurrent message queue not found. Exiting!\n" );
 161         return 0;
 162     }
 163
 164     /* Get the current focus from the perQ data of the current message Q */
 165     return PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 166 }