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Fix to text shrinking

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Summary: Previously the first thing we did when calculating the size of text was to truncate it. This could lead to ASFontSizeAdjuster being sent a truncated string which, obviously, never needed to shrink. If we change the order then we first shrink, then truncate if still necessary.

Reviewers: scottg, levi, garrett

Differential Revision: https://phabricator.pinadmin.com/D89780
This commit is contained in:
rcancro 2016-05-09 15:57:29 -07:00
parent 62a853b3e9
commit 082ababda6
1 changed files with 11 additions and 6 deletions
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13
AsyncDisplayKit/TextKit/ASTextKitRenderer.mm
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@ -137,25 +137,30 @@ static NSCharacterSet *_defaultAvoidTruncationCharacterSet()
- (void)_calculateSize
{
[self truncater];
// if we have no scale factors or an unconstrained width, there is no reason to try to adjust the font size
if (isinf(_constrainedSize.width) == NO && [_attributes.pointSizeScaleFactors count] > 0) {
_currentScaleFactor = [[self fontSizeAdjuster] scaleFactor];
}
// Force glyph generation and layout, which may not have happened yet (and isn't triggered by
// -usedRectForTextContainer:).
__block NSTextStorage *scaledTextStorage = nil;
BOOL isScaled = [self isScaled];
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
if (isScaled) {
// apply the string scale before truncating or else we may truncate the string after we've done the work to shrink it.
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
NSMutableAttributedString *scaledString = [[NSMutableAttributedString alloc] initWithAttributedString:textStorage];
[ASTextKitFontSizeAdjuster adjustFontSizeForAttributeString:scaledString withScaleFactor:_currentScaleFactor];
scaledTextStorage = [[NSTextStorage alloc] initWithAttributedString:scaledString];
[textStorage removeLayoutManager:layoutManager];
[scaledTextStorage addLayoutManager:layoutManager];
}];
}
[self truncater];
// Force glyph generation and layout, which may not have happened yet (and isn't triggered by
// -usedRectForTextContainer:).
[[self context] performBlockWithLockedTextKitComponents:^(NSLayoutManager *layoutManager, NSTextStorage *textStorage, NSTextContainer *textContainer) {
[layoutManager ensureLayoutForTextContainer:textContainer];
}];