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/*
* WETabHooks.c
*
* WASTE TABS PACKAGE
* Hooks for adding tab support to WASTE
*
* Written by:
* Mark Alldritt (original code)
* Dan Crevier (line breaks)
* John Daub (maintenance)
* Jonathan Kew (variable-width tabs)
* Marco Piovanelli (?)
* Bert Seltzer (horizontal scrolling)
*
*/
#include "WETabs.h"
#include "WETabHooks.h"
#define FIXROUND(f) ((SInt16) (((f) + 0x00008000) >> 16))
#define BSL(A, B) (((SInt32) (A)) << (B))
static const Point kOneToOneScaling = { 1, 1 } ;
pascal void _WETabDrawText
(
const char * pText,
SInt32 textLength,
Fixed slop,
JustStyleCode styleRunPosition,
WEReference we
)
{
#pragma unused ( slop, styleRunPosition )
LongRect destRect;
SInt32 beginChar = 0;
SInt32 ii;
SInt16 tabWidth;
SInt16 destLeft;
Point penPos;
SInt16 tabSize = WEGetTabSize(we);
WEGetDestRect(&destRect, we);
destLeft = (SInt16) destRect.left;
for ( ii = 0; ii < textLength; ii++ )
{
if (pText[ii] == '\t')
{
DrawText(pText, beginChar, ii - beginChar);
/* advance the pen to the next tab stop */
GetPen(&penPos);
tabWidth = tabSize - (penPos.h - destLeft) % tabSize;
MoveTo(penPos.h + tabWidth, penPos.v);
beginChar = ii + 1;
}
} /* for */
DrawText(pText, beginChar, textLength - beginChar);
}
pascal SInt32 _WETabPixelToChar
(
const char * pText,
SInt32 textLength,
Fixed slop,
Fixed *width,
WEEdge *edge,
JustStyleCode styleRunPosition,
Fixed hPos,
WEReference we
)
{
SInt32 beginChar = 0;
SInt32 offset = 0;
SInt32 ii;
Fixed lastWidth;
Fixed tabWidth;
SInt16 tabSize = WEGetTabSize(we);
/* loop through every character in the segment looking for tabs */
for ( ii = 0; ii < textLength; ii++ )
{
/* exit now if width has gone negative */
/* (i.e., if we have found which glyph was hit) */
if (*width <= 0)
{
break;
}
/* tab found? */
if (pText[ii] == '\t')
{
/* calculate the width of the sub-segment preceding the tab */
lastWidth = *width;
offset += PixelToChar((char *)pText + beginChar, ii - beginChar, slop,
lastWidth, (Boolean *) edge, width, styleRunPosition,
kOneToOneScaling, kOneToOneScaling);
beginChar = ii + 1;
/* hit point past sub-segment? */
if (*width >= 0)
{
/* increment hPos by width of sub-segment preceding the tab */
hPos += (lastWidth - *width);
/* calculate the width of the tab "glyph" (as a Fixed value) */
tabWidth = BSL(tabSize - FIXROUND(hPos) % tabSize, 16);
/* increment hPos by width of tab character */
hPos += tabWidth;
/* hit point within tab glyph? */
if (*width < tabWidth)
{
/* yes: determine which half of tab glyph was hit */
if (*width > (tabWidth >> 1))
{
*edge = kTrailingEdge; /* second (trailing) edge of tab */
offset++;
}
else
{
*edge = kLeadingEdge; /* first (leading) edge of tab */
}
/* returning -1 (as Fixed) in width means we're finished */
*width = 0xFFFF0000;
}
else
{
/* hit point is past tab: keep looping */
offset++;
*width -= tabWidth;
}
} /* if (*width >= 0) */
} /* if tab found */
} /* for */
/* no more tabs in this segment: process the last sub-segment */
if (*width >= 0)
{
lastWidth = *width;
offset += PixelToChar((char *)pText + beginChar, textLength - beginChar, slop,
lastWidth, (Boolean *) edge, width, styleRunPosition,
kOneToOneScaling, kOneToOneScaling);
}
/* round width to nearest integer value */
/* this is supposed to fix an incompatibility with the WorldScript Power Adapter */
*width = (*width + 0x00008000) & 0xFFFF0000;
return offset;
}
pascal SInt16 _WETabCharToPixel
(
const char * pText,
SInt32 textLength,
Fixed slop,
SInt32 offset,
SInt16 direction,
JustStyleCode styleRunPosition,
SInt16 hPos,
WEReference we
)
{
LongRect destRect;
SInt32 beginChar = 0;
SInt32 ii;
SInt16 width;
SInt16 destLeft;
SInt16 totalWidth = 0;
SInt16 tabSize = WEGetTabSize(we);
WEGetDestRect(&destRect, we);
destLeft = (SInt16) destRect.left;
/* measure text up to offset, if offset is within this segment,
otherwise to textLength */
if (offset > textLength)
{
offset = textLength;
}
for ( ii = 0; ii < offset; ii++ )
{
if (pText[ii] == '\t')
{
/* calculate the pixel width of the subsegment preceding the tab */
width = TextWidth(pText, beginChar, ii - beginChar);
totalWidth += width;
hPos += width;
/* calculate tab width */
width = tabSize - (hPos - destLeft) % tabSize;
totalWidth += width;
hPos += width;
/* go to next subsegment */
beginChar = ii + 1;
}
} /* for */
/* calculate width of remaining characters */
width = CharToPixel((char *)pText + beginChar, textLength - beginChar, slop,
offset - beginChar, direction, styleRunPosition,
kOneToOneScaling, kOneToOneScaling);
totalWidth += width;
return totalWidth;
}
pascal StyledLineBreakCode _WETabLineBreak
(
const char * pText,
SInt32 textLength,
SInt32 textStart,
SInt32 textEnd,
Fixed *textWidth,
SInt32 *textOffset,
WEReference we
)
{
LongRect destRect;
SInt32 beginChar = textStart;
SInt32 ii;
Fixed tabWidth;
SInt16 destWidth;
StyledLineBreakCode breakCode = smBreakOverflow;
SInt16 tabSize = WEGetTabSize(we);
WEGetDestRect(&destRect, we);
destWidth = (SInt16) (destRect.right - destRect.left);
for ( ii = textStart; ii < textEnd; ii++ )
{
if (pText[ii] == 0x0D)
{
/* found a <return>, so stop looking ahead for tabs */
ii++;
break;
}
if (pText[ii] == '\t')
{
/* do previous "segment" */
breakCode = StyledLineBreak((char *)pText, textLength, beginChar, ii, 0, textWidth, textOffset);
if ((breakCode != smBreakOverflow) || (ii >= textLength))
{
break;
}
beginChar = ii + 1;
/* calculate tab width (as a Fixed value) */
tabWidth = BSL(tabSize - (destWidth - FIXROUND(*textWidth)) % tabSize, 16);
/* if tabWidth > pixelWidth we break in tab */
/* don't move tab to next line */
if (tabWidth > *textWidth)
{
breakCode = smBreakWord;
*textOffset = ii + 1;
break;
}
else
{
*textWidth -= tabWidth;
}
}
} /* for */
/* do last sub-segment */
if ((ii - beginChar >= 0) && (breakCode == smBreakOverflow))
{
breakCode = StyledLineBreak((char *)pText, textLength, beginChar, ii, 0, textWidth, textOffset);
}
return breakCode;
}
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