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         for (;;)
  78         {
  79             HWND parent;
  80             LONG style = GetWindowLongW( hwndTop, GWL_STYLE );
  81             if (style & (WS_MINIMIZE | WS_DISABLED)) return 0;
  82             parent = GetAncestor( hwndTop, GA_PARENT );
  83             if (!parent || parent == GetDesktopWindow()) break;
  84             hwndTop = parent;
  85         }
  86
  87         if (!(wndPtr = WIN_FindWndPtr( hwndTop ))) return 0;
  88
  89         /* Retrieve the message queue associated with this window */
  90         pMsgQ = (MESSAGEQUEUE *)QUEUE_Lock( wndPtr->hmemTaskQ );
  91         WIN_ReleaseWndPtr( wndPtr );
  92         if ( !pMsgQ )
  93         {
  94             WARN("\tMessage queue not found. Exiting!\n" );
  95             return 0;
  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_CallHooksA( WH_CBT, HCBT_SETFOCUS, (WPARAM)hwnd, (LPARAM)hWndFocus) )
 118             goto CLEANUP;
 119
 120         /* activate hwndTop if needed. */
 121         if (hwndTop != GetActiveWindow())
 122         {
 123             if (!WINPOS_SetActiveWindow(hwndTop, 0, 0)) goto CLEANUP;
 124
 125             if (!IsWindow( hwnd )) goto CLEANUP;  /* Abort if window destroyed */
 126         }
 127
 128         /* Get the current focus window from the perQ data */
 129         hWndFocus = PERQDATA_GetFocusWnd( pMsgQ->pQData );
 130
 131         /* Change focus and send messages */
 132         FOCUS_SwitchFocus( pMsgQ, hWndFocus, hwnd );
 133     }
 134     else /* NULL hwnd passed in */
 135     {
 136         if( HOOK_CallHooksA( WH_CBT, HCBT_SETFOCUS, 0, (LPARAM)hWndFocus ) )
 137             return 0;
 138
 139         /* Get the current focus from the perQ data of the current message Q */
 140         hWndFocus = PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 141
 142       /* Change focus and send messages */
 143         FOCUS_SwitchFocus( pCurMsgQ, hWndFocus, hwnd );
 144     }
 145
 146     bRet = 1;      /* Success */
 147
 148 CLEANUP:
 149
 150     /* Unlock the queues before returning */
 151     if ( pMsgQ )
 152         QUEUE_Unlock( pMsgQ );
 153
 154     return bRet ? hWndFocus : 0;
 155 }
 156
 157
 158 /*****************************************************************
 159  *              GetFocus (USER.23)
 160  */
 161 HWND16 WINAPI GetFocus16(void)
 162 {
 163     return (HWND16)GetFocus();
 164 }
 165
 166
 167 /*****************************************************************
 168  *              GetFocus (USER32.@)
 169  */
 170 HWND WINAPI GetFocus(void)
 171 {
 172     MESSAGEQUEUE *pCurMsgQ = 0;
 173
 174     /* Get the messageQ for the current thread */
 175     if (!(pCurMsgQ = QUEUE_Current()))
 176     {
 177         WARN("\tCurrent message queue not found. Exiting!\n" );
 178         return 0;
 179     }
 180
 181     /* Get the current focus from the perQ data of the current message Q */
 182     return PERQDATA_GetFocusWnd( pCurMsgQ->pQData );
 183 }