5c3c137277
The computation is now identical to Windows native one. To achieve this, MSDN-recommended GetTextExtent() call is used instead of GetCharWidth(). wxMulDivInt32() is used instead of integer arithmetics to achieve correct rounding. Use toplevel parent's font instead of window's own. This makes more sense, as dialog units are defined for TLWs, not individual subcontrols. Also fixed wxMSW's wxButton::GetDefaultSize() to compute dialog units correctly. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63251 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/private/window.h
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// Purpose: misc wxWindow helpers
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// Author: Vaclav Slavik
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// Created: 2010-01-21
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// RCS-ID: $Id$
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// Copyright: (c) 2010 Vaclav Slavik
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_PRIVATE_WINDOW_H_
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#define _WX_PRIVATE_WINDOW_H_
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#include "wx/gdicmn.h"
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namespace wxPrivate
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{
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// Windows' computes dialog units using average character width over upper-
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// and lower-case ASCII alphabet and not using the average character width
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// metadata stored in the font; see
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// http://support.microsoft.com/default.aspx/kb/145994 for detailed discussion.
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//
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// This helper function computes font dimensions in the same way. It works with
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// either wxDC or wxWindow argument.
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template<typename T>
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inline wxSize GetAverageASCIILetterSize(const T& of_what)
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{
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const wxStringCharType *TEXT_TO_MEASURE =
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wxS("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
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wxSize s = of_what.GetTextExtent(TEXT_TO_MEASURE);
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s.x = (s.x / 26 + 1) / 2;
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return s;
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}
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} // namespace wxPrivate
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#endif // _WX_PRIVATE_WINDOW_H_
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