windows/focus.c

   1 /*
   2  * Focus functions
   3  *
   4  * Copyright 1993 David Metcalfe
   5  *           1994 Alexandre Julliard
   6  *           1995 Alex Korobka
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "windef.h"
  24 #include "wingdi.h"
  25 #include "wine/winuser16.h"
  26 #include "win.h"
  27 #include "winpos.h"
  28 #include "hook.h"
  29 #include "message.h"
  30 #include "queue.h"
  31 #include "user.h"
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(win);
  35
  36
  37 /*****************************************************************
  38  *               FOCUS_SwitchFocus
  39  * pMsgQ is the queue whose perQData focus is to be modified
  40  */
  41 void FOCUS_SwitchFocus( MESSAGEQUEUE *pMsgQ, HWND hFocusFrom, HWND hFocusTo )
  42 {
  43     PERQDATA_SetFocusWnd( pMsgQ->pQData, hFocusTo );
  44
  45     if (hFocusFrom)
  46         SendNotifyMessageA( hFocusFrom, WM_KILLFOCUS, (WPARAM)hFocusTo, 0 );
  47
  48     if( !hFocusTo || hFocusTo != PERQDATA_GetFocusWnd( pMsgQ->pQData ) )
  49     {
  50         return;
  51     }
  52
  53     /* According to API docs, the WM_SETFOCUS message is sent AFTER the window
  54        has received the keyboard focus. */
  55     if (USER_Driver.pSetFocus) USER_Driver.pSetFocus(hFocusTo);
  56
  57     SendMessageA( hFocusTo, WM_SETFOCUS, (WPARAM)hFocusFrom, 0 );
  58 }
  59
  60
  61 /*****************************************************************
  62  *              SetFocus (USER32.@)
  63  */
  64 HWND WINAPI SetFocus( HWND hwnd )
  65 {
  66     HWND hWndFocus = 0, hwndTop = hwnd;
  67     MESSAGEQUEUE *pMsgQ = 0, *pCurMsgQ = 0;
  68     BOOL bRet = 0;
  69
  70     /* Get the messageQ for the current thread */
  71     if (!(pCurMsgQ = QUEUE_Current()))
  72     {
  73         WARN("\tCurrent message queue not found. Exiting!\n" );
  74         return 0;
  75     }
  76
  77     if (hwnd)
  78     {
  79         /* Check if we can set the focus to this window */
  80         WND *wndPtr;
  81
  82         hwnd = WIN_GetFullHandle( hwnd );
  83         for (;;)
  84         {
  85             HWND parent;
  86             LONG style = GetWindowLongW( hwndTop, GWL_STYLE );
  87             if (style & (WS_MINIMIZE | WS_DISABLED)) return 0;
  88             parent = GetAncestor( hwndTop, GA_PARENT );
  89             if (!parent || parent == GetDesktopWindow()) break;
  90             hwndTop = parent;
  91         }
  92
  93         if (!(wndPtr = WIN_FindWndPtr( hwndTop ))) return 0;
  94
  95         /* Retrieve the message queue associated with this window */
  96         pMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( wndPtr->hmemTaskQ );
  97         WIN_ReleaseWndPtr( wndPtr );
  98         if ( !pMsgQ )
  99         {
 100             WARN("\tMessage queue not found. Exiting!\n" );
 101             return 0;
 102         }
 103
 104         /* Make sure that message queue for the window we are setting focus to
 105          * shares the same perQ data as the current threads message queue.
 106          * In other words you can't set focus to a window owned by a different
 107          * thread unless AttachThreadInput has been called previously.
 108          * (see AttachThreadInput and SetFocus docs)
 109          */
 110         if ( pCurMsgQ->pQData != pMsgQ->pQData )
 111             goto CLEANUP;
 112
 113         /* Get the current focus window from the perQ data */
 114         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 115
 116         if( hwnd == hWndFocus )
 117         {
 118             bRet = 1;      /* Success */
 119             goto CLEANUP;  /* Nothing to do */
 120         }
 121
 122         /* call hooks */
 123         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (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_CallHooksA( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hWndFocus ) )
 143             return 0;
 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
 160     return bRet ? hWndFocus : 0;
 161 }
 162
 163
 164 /*****************************************************************
 165  *              GetFocus (USER32.@)
 166  */
 167 HWND WINAPI GetFocus(void)
 168 {
 169     MESSAGEQUEUE *pCurMsgQ = 0;
 170
 171     /* Get the messageQ for the current thread */
 172     if (!(pCurMsgQ = QUEUE_Current()))
 173     {
 174         WARN("\tCurrent message queue not found. Exiting!\n" );
 175         return 0;
 176     }
 177
 178     /* Get the current focus from the perQ data of the current message Q */
 179     return PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 180 }