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Implemented dialog units -> pixels conversion very close to how it's

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actually done by Windows.
This commit is contained in:
Slava Monich 1999-06-06 09:03:08 +00:00 committed by Alexandre Julliard
parent aaa830698c
commit 3a170a1724
1 changed files with 87 additions and 27 deletions
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114
windows/dialog.c
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@ -10,6 +10,7 @@
#include <stdlib.h>
#include <string.h>
#include "winuser.h"
#include "windowsx.h"
#include "wine/winuser16.h"
#include "wine/winbase16.h"
#include "dialog.h"
@ -74,6 +75,79 @@ typedef struct
static WORD xBaseUnit = 0, yBaseUnit = 0;
/***********************************************************************
* DIALOG_GetCharSizeFromDC
*
*
* Calculates the *true* average size of English characters in the
* specified font as oppposed to the one returned by GetTextMetrics.
*/
static BOOL DIALOG_GetCharSizeFromDC( HDC hDC, HFONT hFont, SIZE * pSize )
{
BOOL Success = FALSE;
HFONT hFontPrev = 0;
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 (GetTextMetricsA(hDC,&tm))
{
pSize->cx = tm.tmAveCharWidth;
pSize->cy = tm.tmHeight;
/* if variable width font */
if (tm.tmPitchAndFamily & TMPF_FIXED_PITCH)
{
SIZE total;
static const char szAvgChars[52] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
/* Calculate a true average as opposed to the one returned
* by tmAveCharWidth. This works better when dealing with
* proportional spaced fonts and (more important) that's
* how Microsoft's dialog creation code calculates the size
* of the font
*/
if (GetTextExtentPointA(hDC,szAvgChars,sizeof(szAvgChars),&total))
{
/* round up */
pSize->cx = ((2*total.cx/sizeof(szAvgChars)) + 1)/2;
Success = TRUE;
}
}
else
{
Success = TRUE;
}
}
/* select the original font */
if (hFontPrev) SelectFont(hDC,hFontPrev);
}
return (Success);
}
/***********************************************************************
* DIALOG_GetCharSize
*
*
* Calculates the *true* average size of English characters in the
* specified font as oppposed to the one returned by GetTextMetrics.
* A convenient variant of DIALOG_GetCharSizeFromDC.
*/
static BOOL DIALOG_GetCharSize( HFONT hFont, SIZE * pSize )
{
HDC hDC = GetDC(0);
BOOL Success = DIALOG_GetCharSizeFromDC( hDC, hFont, pSize );
ReleaseDC(0, hDC);
return Success;
}
/***********************************************************************
* DIALOG_Init
*
@ -81,24 +155,18 @@ static WORD xBaseUnit = 0, yBaseUnit = 0;
*/
BOOL DIALOG_Init(void)
{
TEXTMETRIC16 tm;
HDC16 hdc;
SIZE size;
/* Calculate the dialog base units */
if (!(hdc = CreateDC16( "DISPLAY", NULL, NULL, NULL ))) return FALSE;
GetTextMetrics16( hdc, &tm );
if (!DIALOG_GetCharSizeFromDC( hdc, 0, &size )) return FALSE;
DeleteDC( hdc );
xBaseUnit = tm.tmAveCharWidth;
yBaseUnit = tm.tmHeight;
xBaseUnit = size.cx;
yBaseUnit = size.cy;
/* Dialog units are based on a proportional system font */
/* so we adjust them a bit for a fixed font. */
if (!(tm.tmPitchAndFamily & TMPF_FIXED_PITCH))
xBaseUnit = xBaseUnit * 5 / 4;
TRACE(dialog, "base units = %d,%d\n",
xBaseUnit, yBaseUnit );
TRACE(dialog, "base units = %d,%d\n", xBaseUnit, yBaseUnit );
return TRUE;
}
@ -597,21 +665,13 @@ HWND DIALOG_CreateIndirect( HINSTANCE hInst, LPCSTR dlgTemplate,
FALSE, FALSE, FALSE, DEFAULT_CHARSET, 0, 0,
PROOF_QUALITY, FF_DONTCARE,
template.faceName );
if (hFont)
{
TEXTMETRIC16 tm;
HFONT16 oldFont;
HDC hdc = GetDC(0);
oldFont = SelectObject( hdc, hFont );
GetTextMetrics16( hdc, &tm );
SelectObject( hdc, oldFont );
ReleaseDC( 0, hdc );
xUnit = tm.tmAveCharWidth;
yUnit = tm.tmHeight;
if (!(tm.tmPitchAndFamily & TMPF_FIXED_PITCH))
xBaseUnit = xBaseUnit * 5 / 4; /* See DIALOG_Init() */
}
if (hFont)
{
SIZE charSize;
DIALOG_GetCharSize(hFont,&charSize);
xUnit = charSize.cx;
yUnit = charSize.cy;
}
}
/* Create dialog main window */