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use fixed TOOLINFO struct size instead of trying to (wrongly) deduce it from the _WIN32_IE value, fixes bug with tooltips not appearing under Windows 95

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49509 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2007-10-29 00:33:48 +00:00
parent 1044b90c1b
commit 7709915e96
1 changed files with 9 additions and 11 deletions
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20
src/msw/tooltip.cpp
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@ -36,6 +36,10 @@
#include "wx/tokenzr.h" #include "wx/tokenzr.h"
#include "wx/msw/private.h" #include "wx/msw/private.h"
#ifndef TTTOOLINFO_V1_SIZE
#define TTTOOLINFO_V1_SIZE 0x28
#endif
// VZ: normally, the trick with subclassing the tooltip control and processing // VZ: normally, the trick with subclassing the tooltip control and processing
// TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the // TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the
// code here for now (but it's not compiled) in case we need it later. // code here for now (but it's not compiled) in case we need it later.
@ -78,20 +82,14 @@ public:
::ZeroMemory(this, sizeof(TOOLINFO)); ::ZeroMemory(this, sizeof(TOOLINFO));
// the structure TOOLINFO has been extended with a 4 byte field in // the structure TOOLINFO has been extended with a 4 byte field in
// version 4.70 of comctl32.dll and if we compile on a newer machine // version 4.70 of comctl32.dll and another one in 5.01 but we don't
// but run on one with the old version of comctl32, nothing will work // use these extended fields so use the old struct size to ensure that
// because the library will detect that we rely on a more recent // the tooltips work on old (Windows 95) systems too
// version of it. So we always use the old size - if we ever start cbSize = TTTOOLINFO_V1_SIZE;
// using our lParam member, we'd have to check for comctl32 version
// during run-time
#if _WIN32_IE >= 0x0300
cbSize = sizeof(TOOLINFO) - sizeof(LPARAM);
#else // old headers
cbSize = sizeof(TOOLINFO);
#endif // compile-time comctl32.dll version
hwnd = hwndOwner; hwnd = hwndOwner;
uFlags = TTF_IDISHWND; uFlags = TTF_IDISHWND;
uId = (UINT)hwndOwner; uId = (UINT)hwndOwner;
} }
}; };