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Incorrect cached child size is used because YGNodeCanUseCachedMeasurement() does not respect min/max dimensions #1003

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nickolas-pohilets opened this issue May 4, 2020 · 2 comments · May be fixed by #1017

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@nickolas-pohilets
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Issues and Steps to Reproduce

See the attached example.

Child node has height = 10, minHeight = 40%, maxHeight = 60%.

When parent is measured against height = NaN, child height is computed to be 10, which is correct.

But then parent is laid out against height = 30.
Now child height should be max(40% * 30, min(10, 60% * 30)) = max(12, min(10, 18)) = 12.
But YGNodeCanUseCachedMeasurement() returns true and cached height of 10 is used instead.

Expected Behavior

In all the cases, final layout should have child height of 12.

Actual Behavior

In some of the scenarios incorrect cached height is used.

Link to Code

https://pastebin.com/x5e6ZL2b

@woehrl01
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Hi @nickolas-pohilets,

thanks for pointing that out. I just pushed PR for a fix.

@woehrl01
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I'm not sure if the PR will be merged, as it is a quite edge case here, which leads to increasing the binary size for each node.

In that case I suggest, adding another root node, where you set height and width directly and pass YGUndefined to YGNodeCalculateLayout for width and height.

Changing these values on that new root node lead to proper invalidation of the tree.

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3 participants