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More OS X layout work.

This commit is contained in:
Pietro Gagliardi 2016-01-15 22:48:38 -05:00
parent b5292e4e80
commit 37f9bfd1b9
1 changed files with 21 additions and 1 deletions
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22
darwin/drawtext.m
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@ -526,13 +526,21 @@ void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
layout->width = width; layout->width = width;
} }
// TODO CTFrameProgression for RTL/LTR
// TODO document that the extent width can be greater than the requested width if the requested width is small enough that only one character can fit
// TODO figure out how line separation and leading plays into this
void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height) void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height)
{ {
CTLineRef line; CTLineRef line;
CTFramesetterRef fs;
CGSize size;
CFRange fitRange;
double ascent, descent; double ascent, descent;
double w; double w;
// one line // one line
// TODO actually could not constraining the width of the framesetter do the same thing?
if (layout->width < 0) { if (layout->width < 0) {
line = CTLineCreateWithAttributedString(layout->mas); line = CTLineCreateWithAttributedString(layout->mas);
if (line == NULL) if (line == NULL)
@ -544,7 +552,19 @@ void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *he
*height = ascent + descent; *height = ascent + descent;
return; return;
} }
// TODO
// multiple lines
fs = CTFramesetterCreateWithAttributedString(layout->mas);
if (fs == NULL)
complain("error creating CTFramesetter object in uiDrawTextLayoutExtents()");
size = CTFramesetterSuggestFrameSizeWithConstraints(fs,
CFRangeMake(0, 0),
NULL, // TODO kCTFramePathWidthAttributeName?
CGSizeMake(layout->width, CGFLOAT_MAX),
&fitRange); // not documented as accepting NULL
CFRelease(fs);
*width = size.width;
*height = size.height;
} }
// Core Text doesn't draw onto a flipped view correctly; we have to do this // Core Text doesn't draw onto a flipped view correctly; we have to do this