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When relayout a node, preserve its frame origin.

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This commit is contained in:
Huy Nguyen 2015-08-27 20:57:53 +03:00
parent 9c51bde8e8
commit 075c39e398
1 changed files with 21 additions and 3 deletions
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24
AsyncDisplayKit/ASDisplayNode.mm
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@ -600,9 +600,27 @@ void ASDisplayNodeRespectThreadAffinityOfNode(ASDisplayNode *node, void (^block)
} else { } else {
// This is the root node. Trigger a full measurement pass on *current* thread. Old constrained size is re-used. // This is the root node. Trigger a full measurement pass on *current* thread. Old constrained size is re-used.
[self measureWithSizeRange:oldConstrainedSize]; [self measureWithSizeRange:oldConstrainedSize];
CGRect bounds = self.bounds;
bounds.size = CGSizeMake(_layout.size.width, _layout.size.height); CGSize oldSize = self.bounds.size;
self.bounds = bounds; CGSize newSize = _layout.size;
if (! CGSizeEqualToSize(oldSize, newSize)) {
CGRect bounds = self.bounds;
bounds.size = newSize;
self.bounds = bounds;
// Frame's origin must be preserved. Since it is computed from bounds size, anchorPoint
// and position (see frame setter in ASDisplayNode+UIViewBridge), position needs to be adjusted.
BOOL useLayer = (_layer && ASDisplayNodeThreadIsMain());
CGPoint anchorPoint = (useLayer ? _layer.anchorPoint : self.anchorPoint);
CGPoint oldPosition = (useLayer ? _layer.position : self.position);
CGFloat xDelta = (newSize.width - oldSize.width) * anchorPoint.x;
CGFloat yDelta = (newSize.height - oldSize.height) * anchorPoint.y;
CGPoint newPosition = CGPointMake(oldPosition.x + xDelta, oldPosition.y + yDelta);
useLayer ? _layer.position = newPosition : self.position = newPosition;
}
} }
} }