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Implemented the range-to-rect function on OS X.

This commit is contained in:
Pietro Gagliardi 2017-02-05 21:17:48 -05:00
parent b18cc88dce
commit 0ae25c62ed
1 changed files with 40 additions and 0 deletions
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40
darwin/drawtext.m
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@ -330,6 +330,46 @@ void uiDrawTextLayoutHitTest(uiDrawTextLayout *tl, double x, double y, uiDrawTex
result->Pos = tl->u16tou8[pos];
}
// TODO document this is appropriate for a caret
// TODO what happens if we select across a wrapped line?
void uiDrawTextLayoutByteRangeToRectangle(uiDrawTextLayout *tl, size_t start, size_t end, uiDrawTextLayoutByteRangeRectangle *r)
{
CFIndex i;
CTLineRef line;
CFRange range;
CGFloat x, x2; // TODO rename x to x1
if (start > tl->nUTF8)
start = tl->nUTF8;
if (end > tl->nUTF8)
end = tl->nUTF8;
start = tl->u8tou16[start];
end = tl->u8tou16[end];
for (i = 0; i < tl->nLines; i++) {
line = (CTLineRef) CFArrayGetValueAtIndex(tl->lines, i);
range = CTLineGetStringRange(line);
if (start >= range.location)
break;
}
if (i == tl->nLines)
i--;
r->Line = i;
if (end > (range.location + range.length))
end = range.location + range.length;
x = CTLineGetOffsetForStringIndex(line, start, NULL);
x2 = CTLineGetOffsetForStringIndex(line, end, NULL);
r->X = tl->lineMetrics[i].X + x;
r->Y = tl->lineMetrics[i].Y;
r->Width = (tl->lineMetrics[i].X + x2) - r->X;
r->Height = tl->lineMetrics[i].Height;
// and use x and x2 to get the actual start and end positions
// TODO error check?
r->RealStart = CTLineGetStringIndexForPosition(line, CGPointMake(x, 0));
r->RealEnd = CTLineGetStringIndexForPosition(line, CGPointMake(x2, 0));
r->RealStart = tl->u16tou8[r->RealStart];
r->RealEnd = tl->u16tou8[r->RealEnd];
}