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SetBuddy no longer overwrites its superclass' WndProc property when 

the buddy has already been subclassed, eliminating the infinite loop
that resulted.
This commit is contained in:
Susan Farley 2000-05-23 21:22:27 +00:00 committed by Alexandre Julliard
parent f2b77ccb77
commit 62c5d9f366
1 changed files with 14 additions and 19 deletions
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33
dlls/comctl32/updown.c
View File

@ -426,6 +426,7 @@ static BOOL UPDOWN_SetBuddy (HWND hwnd, HWND hwndBud)
DWORD dwStyle = GetWindowLongA (hwnd, GWL_STYLE);
RECT budRect; /* new coord for the buddy */
int x,width; /* new x position and width for the up-down */
WNDPROC baseWndProc, currWndProc;
/* Is it a valid bud? */
if(!IsWindow(hwndBud))
@ -450,19 +451,17 @@ static BOOL UPDOWN_SetBuddy (HWND hwnd, HWND hwndBud)
when we reset the upDown ctrl buddy to another buddy because it is not
good to break the window proc chain. */
/* keep buddy supperclass wndproc in prop instead of in ptr struct
to prevent accessing freed memory */
SetPropA(
hwndBud,
BUDDY_SUPERCLASS_WNDPROC,
(LONG)GetWindowLongA(hwndBud, GWL_WNDPROC) );
/* Assign the buddy wndproc to local wndproc in order to override
keyboard's up and down arrow */
SetWindowLongA(
hwndBud,
GWL_WNDPROC,
(LONG)UPDOWN_Buddy_SubclassProc);
currWndProc = (WNDPROC) GetWindowLongA(hwndBud, GWL_WNDPROC);
if (currWndProc != UPDOWN_Buddy_SubclassProc)
{
// replace the buddy's WndProc with ours
baseWndProc = (WNDPROC)SetWindowLongA(hwndBud, GWL_WNDPROC,
(LPARAM)UPDOWN_Buddy_SubclassProc);
// and save the base class' WndProc
SetPropA(hwndBud, BUDDY_SUPERCLASS_WNDPROC, (HANDLE)baseWndProc);
}
// else
// its already been subclassed, don't overwrite BUDDY_SUPERCLASS_WNDPROC
}
/* do we need to do any adjustments? */
@ -951,7 +950,7 @@ UPDOWN_Buddy_SubclassProc (
WPARAM wParam,
LPARAM lParam)
{
LONG superClassWndProc = GetPropA(hwnd, BUDDY_SUPERCLASS_WNDPROC);
WNDPROC superClassWndProc = (WNDPROC)GetPropA(hwnd, BUDDY_SUPERCLASS_WNDPROC);
TRACE("hwnd=%04x, wndProc=%d, uMsg=%04x, wParam=%d, lParam=%d\n",
hwnd, (INT)superClassWndProc, uMsg, wParam, (UINT)lParam);
@ -980,12 +979,8 @@ UPDOWN_Buddy_SubclassProc (
}
/* else Fall Through */
}
default:
return CallWindowProcA( (WNDPROC)superClassWndProc, hwnd, uMsg, wParam, lParam);
}
return 0;
return CallWindowProcA( superClassWndProc, hwnd, uMsg, wParam, lParam);
}
/***********************************************************************