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The horizontal dialog base unit is calculated as the straight average 

of a-z,A-Z (tmAveCharWidth is supposed to be a weighted average
according to character usage, so we shouldn't use this).
This commit is contained in:
Huw D M Davies 2002-04-03 20:06:04 +00:00 committed by Alexandre Julliard
parent ee77955a6c
commit 79fdd847e0
1 changed files with 28 additions and 36 deletions
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64
windows/dialog.c
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@ -150,37 +150,35 @@ BOOL DIALOG_DisableOwner( HWND hOwner )
/***********************************************************************
* DIALOG_GetCharSizeFromDC
*
*
* Calculates the *true* average size of English characters in the
* specified font as oppposed to the one returned by GetTextMetrics.
*
* Latest: the X font driver will now compute a proper average width
* so this code can be removed
* Despite most of MSDN insisting that the horizontal base unit is
* tmAveCharWidth it isn't. Knowledge base article Q145994
* "HOWTO: Calculate Dialog Units When Not Using the System Font",
* says that we should take the average of the 52 English upper and lower
* case characters.
*/
static BOOL DIALOG_GetCharSizeFromDC( HDC hDC, HFONT hFont, SIZE * pSize )
{
BOOL Success = FALSE;
HFONT hFontPrev = 0;
char *alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
SIZE sz;
TEXTMETRICA tm;
pSize->cx = xBaseUnit;
pSize->cy = yBaseUnit;
if ( hDC )
{
/* select the font */
TEXTMETRICA tm;
memset(&tm,0,sizeof(tm));
if (hFont) hFontPrev = SelectFont(hDC,hFont);
if ((Success = GetTextMetricsA(hDC,&tm)))
{
pSize->cx = tm.tmAveCharWidth;
pSize->cy = tm.tmHeight;
TRACE("Using tm: %ldx%ld (dlg: %ld x %ld) (%s)\n",
tm.tmAveCharWidth, tm.tmHeight, pSize->cx, pSize->cy,
tm.tmPitchAndFamily & TMPF_FIXED_PITCH ? "variable" : "fixed");
}
/* select the original font */
if (hFontPrev) SelectFont(hDC,hFontPrev);
}
return (Success);
if(!hDC) return FALSE;
if(hFont) hFontPrev = SelectFont(hDC, hFont);
if(!GetTextMetricsA(hDC, &tm)) return FALSE;
if(!GetTextExtentPointA(hDC, alphabet, 52, &sz)) return FALSE;
pSize->cy = tm.tmHeight;
pSize->cx = (sz.cx / 26 + 1) / 2;
if (hFontPrev) SelectFont(hDC, hFontPrev);
TRACE("dlg base units: %ld x %ld\n", pSize->cx, pSize->cy);
return TRUE;
}
/***********************************************************************
@ -731,19 +729,13 @@ static HWND DIALOG_CreateIndirect( HINSTANCE hInst, LPCSTR dlgTemplate,
if (template.style & DS_SETFONT)
{
/* The font height must be negative as it is a point size */
/* and must be converted to pixels first */
/* (see CreateFont() documentation in the Windows SDK). */
/* We convert the size to pixels and then make it -ve. This works
* for both +ve and -ve template.pointSize */
HDC dc;
int pixels;
if (((short)template.pointSize) < 0)
pixels = -((short)template.pointSize);
else
{
dc = GetDC(0);
pixels = template.pointSize * GetDeviceCaps(dc , LOGPIXELSY)/72;
ReleaseDC(0, dc);
}
dc = GetDC(0);
pixels = MulDiv(template.pointSize, GetDeviceCaps(dc , LOGPIXELSY), 72);
ReleaseDC(0, dc);
if (win32Template)
dlgInfo->hUserFont = CreateFontW( -pixels, 0, 0, 0, template.weight,
template.italic, FALSE, FALSE, DEFAULT_CHARSET, 0, 0,