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* added _TabExpandedStyledWidth(), which makes sure to expand all tab chars

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during the width calculation
* used _TabExpandedStyledWidth() at all places that need to expand tabs,
  fixing #4822
* removed _StyledWidthUTF8Safe() as it didn't make sense - we now perform
  the same auto-scrolling horizontally as we do vertically


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33713 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Oliver Tappe
2009-10-21 19:09:20 +00:00
parent ee739a2777
commit 32c8ab89a9
2 changed files with 64 additions and 50 deletions
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src/kits/interface/TextView.cpp
+62 -48
View File
@@ -1781,24 +1781,9 @@ BTextView::PointAt(int32 inOffset, float *outHeight) const
fStyles->SyncNullStyle(inOffset);
height = _NullStyleHeight();
} else {
int32 offset = line->offset;
int32 length = inOffset - line->offset;
int32 numBytes = length;
bool foundTab = false;
do {
foundTab = fText->FindChar(B_TAB, offset, &numBytes);
float width = _StyledWidth(offset, numBytes);
result.x += width;
result.x += _TabExpandedStyledWidth(line->offset, length);
if (foundTab) {
result.x += _ActualTabWidth(result.x);
numBytes++;
}
offset += numBytes;
length -= numBytes;
numBytes = length;
} while (foundTab && length > 0);
}
}
@@ -1993,7 +1978,7 @@ BTextView::LineWidth(int32 lineNum) const
if (ByteAt((line + 1)->offset - 1) == B_ENTER)
length--;
return _StyledWidth(line->offset, length);
return _TabExpandedStyledWidth(line->offset, length);
}
@@ -3839,8 +3824,8 @@ BTextView::_FindLineBreak(int32 fromOffset, float *outAscent, float *outDescent,
offset += fromOffset;
int32 toOffset = (offset < limit) ? offset : limit;
*inOutWidth = _StyledWidth(fromOffset, toOffset - fromOffset, outAscent,
outDescent);
*inOutWidth = _TabExpandedStyledWidth(fromOffset, toOffset - fromOffset,
outAscent, outDescent);
return offset < limit ? offset + 1 : limit;
}
@@ -4037,6 +4022,49 @@ BTextView::_NextWordBoundary(int32 offset)
}
/*! \brief Returns the width used by the characters starting at the given
offset with the given length, expanding all tab characters as needed.
*/
float
BTextView::_TabExpandedStyledWidth(int32 offset, int32 length, float* outAscent,
float* outDescent) const
{
float ascent = 0.0;
float descent = 0.0;
float maxAscent = 0.0;
float maxDescent = 0.0;
float width = 0.0;
int32 numBytes = length;
bool foundTab = false;
do {
foundTab = fText->FindChar(B_TAB, offset, &numBytes);
width += _StyledWidth(offset, numBytes, &ascent, &descent);
if (maxAscent < ascent)
maxAscent = ascent;
if (maxDescent < descent)
maxDescent = descent;
if (foundTab) {
width += _ActualTabWidth(width);
numBytes++;
}
offset += numBytes;
length -= numBytes;
numBytes = length;
} while (foundTab && length > 0);
if (outAscent != NULL)
*outAscent = maxAscent;
if (outDescent != NULL)
*outDescent = maxDescent;
return width;
}
/*! \brief Calculate the width of the text within the given limits.
\param fromOffset The offset where to start.
\param length The length of the text to examine.
@@ -4047,8 +4075,8 @@ BTextView::_NextWordBoundary(int32 offset)
\return The width for the text within the given limits.
*/
float
BTextView::_StyledWidth(int32 fromOffset, int32 length, float *outAscent,
float *outDescent) const
BTextView::_StyledWidth(int32 fromOffset, int32 length, float* outAscent,
float* outDescent) const
{
if (length == 0) {
// determine height of char at given offset, but return empty width
@@ -4098,21 +4126,6 @@ BTextView::_StyledWidth(int32 fromOffset, int32 length, float *outAscent,
}
// Unlike the _StyledWidth method, this one takes as parameter
// the number of chars, not the number of bytes.
float
BTextView::_StyledWidthUTF8Safe(int32 fromOffset, int32 numChars,
float *outAscent, float *outDescent) const
{
int32 toOffset = fromOffset;
while (numChars--)
toOffset = _NextInitialByte(toOffset);
const int32 length = toOffset - fromOffset;
return _StyledWidth(fromOffset, length, outAscent, outDescent);
}
/*! \brief Calculate the actual tab width for the given location.
\param location The location to calculate the tab width of.
\return The actual tab width for the given location
@@ -4741,24 +4754,25 @@ BTextView::_PerformAutoScrolling()
BRect bounds = Bounds();
BPoint scrollBy(B_ORIGIN);
BPoint constraint = fWhere;
constraint.ConstrainTo(bounds);
// Scroll char by char horizontally
// TODO: Check how BeOS R5 behaves
float value = _StyledWidthUTF8Safe(OffsetAt(constraint), 1);
// R5 does a pretty soft auto-scroll, we try to do the same by
// simply scrolling the distance between cursor and border
if (fWhere.x > bounds.right) {
if (bounds.right + value <= fTextRect.Width())
scrollBy.x = value;
scrollBy.x = fWhere.x - bounds.right;
} else if (fWhere.x < bounds.left) {
if (bounds.left - value >= 0)
scrollBy.x = -value;
scrollBy.x = fWhere.x - bounds.left; // negative value
}
// prevent from scrolling out of view
if (scrollBy.x != 0.0) {
float rightMax = floorf(fTextRect.right + fLayoutData->rightInset);
if (bounds.right + scrollBy.x > rightMax)
scrollBy.x = rightMax - bounds.right;
if (bounds.left + scrollBy.x < 0)
scrollBy.x = -bounds.left;
}
if (CountLines() > 1) {
// scroll in Y only if multiple lines!
// R5 does a pretty soft auto-scroll, we try to do the same by
// simply scrolling the distance between cursor and border
if (fWhere.y > bounds.bottom) {
scrollBy.y = fWhere.y - bounds.bottom;
} else if (fWhere.y < bounds.top) {