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Put in place a proper tab model within DrawText (also includes 

simplifying TEXT_NextLineW to remove duplicate code).
This commit is contained in:
Bill Medland 2002-02-12 18:40:36 +00:00 committed by Alexandre Julliard
parent 48a87e6107
commit cabe8ca580
1 changed files with 128 additions and 74 deletions
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202
dlls/user/text.c
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@ -75,15 +75,9 @@ DEFAULT_DEBUG_CHANNEL(text);
#define FORWARD_SLASH '/'
#define BACK_SLASH '\\'
static const WCHAR SPACEW[] = {' ', 0};
static const WCHAR oW[] = {'o', 0};
static const WCHAR ELLIPSISW[] = {'.','.','.', 0};
static const WCHAR FORWARD_SLASHW[] = {'/', 0};
static const WCHAR BACK_SLASHW[] = {'\\', 0};
static int tabstop;
static int tabwidth;
static int spacewidth;
static int prefix_offset;
/*********************************************************************
@ -349,23 +343,24 @@ static int TEXT_Reprefix (const WCHAR *str, unsigned int n1, unsigned int n2,
static const WCHAR *TEXT_NextLineW( HDC hdc, const WCHAR *str, int *count,
WCHAR *dest, int *len, int width, WORD format)
{
int i = 0, j = 0, k;
int i = 0, j = 0;
int plen = 0;
int numspaces;
SIZE size;
int lasttab = 0;
int wb_i = 0, wb_j = 0, wb_count = 0;
int maxl = *len;
int normal_char;
while (*count && j < maxl)
{
normal_char = 1;
switch (str[i])
{
case CR:
case LF:
if (!(format & DT_SINGLELINE))
{
if ((*count > 1) && (str[i] == CR) && (str[i+1] == LF))
if ((*count > 1) && (((str[i] == CR) && (str[i+1] == LF)) ||
((str[i] == LF) && (str[i+1] == CR))))
{
(*count)--;
i++;
@ -375,89 +370,61 @@ static const WCHAR *TEXT_NextLineW( HDC hdc, const WCHAR *str, int *count,
(*count)--;
return (&str[i]);
}
dest[j++] = str[i++];
if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX) ||
(format & DT_WORDBREAK))
{
if (!GetTextExtentPointW(hdc, &dest[j-1], 1, &size))
return NULL;
plen += size.cx;
}
/* else it's just another character */
break;
case PREFIX:
if (!(format & DT_NOPREFIX) && *count > 1)
{
if (str[++i] == PREFIX)
(*count)--;
(*count)--; /* and treat it as just another character */
else {
prefix_offset = j;
normal_char = 0; /* we are skipping the PREFIX itself */
break;
}
}
dest[j++] = str[i++];
if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX) ||
(format & DT_WORDBREAK))
{
if (!GetTextExtentPointW(hdc, &dest[j-1], 1, &size))
return NULL;
plen += size.cx;
}
break;
case TAB:
if (format & DT_EXPANDTABS)
{
wb_i = ++i;
wb_j = j;
wb_count = *count;
if ((format & DT_WORDBREAK))
{
wb_i = i+1;
wb_j = j;
wb_count = *count;
}
if (!GetTextExtentPointW(hdc, &dest[lasttab], j - lasttab, &size))
return NULL;
numspaces = (tabwidth - size.cx) / spacewidth;
for (k = 0; k < numspaces; k++)
dest[j++] = SPACE;
plen += tabwidth - size.cx;
lasttab = wb_j + numspaces;
}
else
{
dest[j++] = str[i++];
if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX) ||
(format & DT_WORDBREAK))
{
if (!GetTextExtentPointW(hdc, &dest[j-1], 1, &size))
return NULL;
plen += size.cx;
}
normal_char = 0;
dest[j++] = str[i++];
if (!(format & DT_NOCLIP) || (format & DT_WORDBREAK))
plen = ((plen/tabwidth)+1)*tabwidth;
}
break;
case SPACE:
dest[j++] = str[i++];
if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX) ||
(format & DT_WORDBREAK))
if ((format & DT_WORDBREAK))
{
wb_i = i;
wb_j = j - 1;
wb_i = i+1;
wb_j = j;
wb_count = *count;
if (!GetTextExtentPointW(hdc, &dest[j-1], 1, &size))
return NULL;
plen += size.cx;
}
}
break;
default:
}
if (normal_char)
{
dest[j++] = str[i++];
if (!(format & DT_NOCLIP) || !(format & DT_NOPREFIX) ||
(format & DT_WORDBREAK))
if (!(format & DT_NOCLIP) || (format & DT_WORDBREAK))
{
if (!GetTextExtentPointW(hdc, &dest[j-1], 1, &size))
return NULL;
plen += size.cx;
}
}
}
(*count)--;
if (!(format & DT_NOCLIP) || (format & DT_WORDBREAK))
@ -523,6 +490,39 @@ static void TEXT_DrawUnderscore (HDC hdc, int x, int y, const WCHAR *str, int of
DeleteObject (hpen);
}
/* We are only going to need this until we correct the measuring in
* TEXT_NextLineW (coming soon)
*/
static int TEXT_TextExtent (HDC hdc, UINT flags, const WCHAR *line, int len, SIZE *size)
{
if ((flags & DT_EXPANDTABS))
{
SIZE tsize;
const WCHAR *p;
size->cx = 0;
size->cy = 0;
while (len)
{
p = line; while (p < line+len && *p != TAB) p++;
if (!GetTextExtentPointW (hdc, line, p-line, &tsize)) return 0;
size->cx += tsize.cx;
if (tsize.cy > size->cy) size->cy = tsize.cy;
len -= (p-line);
line=p;
if (len)
{
assert (*line == TAB);
len--;
line++;
size->cx = ((size->cx/tabwidth)+1)*tabwidth;
}
}
return 1;
}
else
return GetTextExtentPointW(hdc, line, len, size);
}
/***********************************************************************
* DrawTextExW (USER32.@)
*
@ -573,14 +573,10 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
dtp->uiLengthDrawn = 0; /* This param RECEIVES number of chars processed */
}
tabstop = ((flags & DT_TABSTOP) && dtp) ? dtp->iTabLength : 8;
if (flags & DT_EXPANDTABS)
{
GetTextExtentPointW(hdc, SPACEW, 1, &size);
spacewidth = size.cx;
GetTextExtentPointW(hdc, oW, 1, &size);
tabwidth = size.cx * tabstop;
int tabstop = ((flags & DT_TABSTOP) && dtp) ? dtp->iTabLength : 8;
tabwidth = tm.tmAveCharWidth * tabstop;
}
if (flags & DT_CALCRECT) flags |= DT_NOCLIP;
@ -591,7 +587,7 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
len = MAX_STATIC_BUFFER;
strPtr = TEXT_NextLineW(hdc, strPtr, &count, line, &len, width, flags);
if (!GetTextExtentPointW(hdc, line, len, &size)) return 0;
if (!TEXT_TextExtent(hdc, flags, line, len, &size)) return 0;
if (flags & DT_CENTER) x = (rect->left + rect->right -
size.cx) / 2;
else if (flags & DT_RIGHT) x = rect->right - size.cx;
@ -611,6 +607,22 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
int len_ellipsis;
int len_after_ellipsis;
if ((flags & DT_EXPANDTABS))
{
/* If there are tabs then we must only ellipsify the last
* segment. That will become trivial when we move the
* ellipsification into the TEXT_NextLineW (coming soon)
*/
const WCHAR *p;
p = line + len;
while (p > line)
if (*(--p) == TAB)
{
FIXME ("Ellipsification of single line tabbed strings will be fixed shortly\n");
break;
}
}
if (flags & DT_PATH_ELLIPSIS)
{
/* We may need to remeasure the string because it was clipped */
@ -637,12 +649,54 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
}
if (!(flags & DT_CALCRECT))
{
if (!ExtTextOutW( hdc, x, y,
((flags & DT_NOCLIP) ? 0 : ETO_CLIPPED) |
((flags & DT_RTLREADING) ? ETO_RTLREADING : 0),
rect, line, len, NULL )) return 0;
if (prefix_offset != -1)
TEXT_DrawUnderscore (hdc, x, y + tm.tmAscent + 1, line, prefix_offset);
const WCHAR *str = line;
int xseg = x;
while (len)
{
int len_seg;
SIZE size;
if ((flags & DT_EXPANDTABS))
{
const WCHAR *p;
p = str; while (p < str+len && *p != TAB) p++;
len_seg = p - str;
if (len_seg != len && !GetTextExtentPointW(hdc, str, len_seg, &size))
return 0;
}
else
len_seg = len;
if (!ExtTextOutW( hdc, xseg, y,
((flags & DT_NOCLIP) ? 0 : ETO_CLIPPED) |
((flags & DT_RTLREADING) ? ETO_RTLREADING : 0),
rect, str, len_seg, NULL )) return 0;
if (prefix_offset != -1 && prefix_offset < len_seg)
{
TEXT_DrawUnderscore (hdc, xseg, y + tm.tmAscent + 1, str, prefix_offset);
}
len -= len_seg;
str += len_seg;
if (len)
{
assert ((flags & DT_EXPANDTABS) && *str == TAB);
len--; str++;
xseg += ((size.cx/tabwidth)+1)*tabwidth;
if (prefix_offset != -1)
{
if (prefix_offset < len_seg)
{
/* We have just drawn an underscore; we ought to
* figure out where the next one is. I am going
* to leave it for now until I have a better model
* for the line, which will make reprefixing easier
*/
prefix_offset = -1;
}
else
prefix_offset -= len_seg;
}
}
}
}
else if (size.cx > max_width)
max_width = size.cx;