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[ASDisplayNode] -didEnterPreloadState does not need to call -layoutIfNeeded #trivial #411

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Jul 5, 2017
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[ASDisplayNode] -didEnterPreloadState does not need to call -layoutIfNeeded #trivial #411

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6 changes: 3 additions & 3 deletions Source/ASCollectionNode.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -213,10 +213,10 @@ - (void)interfaceStateDidChange:(ASInterfaceState)newState fromState:(ASInterfac

- (void)didEnterPreloadState
{
// Intentionally allocate the view here so that super will trigger a layout pass on it which in turn will trigger the intial data load.
// We can get rid of this call later when ASDataController, ASRangeController and ASCollectionLayout can operate without the view.
[self view];
[super didEnterPreloadState];
// Intentionally allocate the view here and trigger a layout pass on it, which in turn will trigger the intial data load.
// We can get rid of this call later when ASDataController, ASRangeController and ASCollectionLayout can operate without the view.
[[self view] layoutIfNeeded];
}

#if ASRangeControllerLoggingEnabled
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4 changes: 0 additions & 4 deletions Source/ASDisplayNode.mm
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Expand Up @@ -2915,10 +2915,6 @@ - (void)didEnterPreloadState
ASDisplayNodeAssertLockUnownedByCurrentThread(__instanceLock__);
[_interfaceStateDelegate didEnterPreloadState];

// Trigger a layout pass to ensure all subnodes have the correct size to preload their content.
// This is important for image nodes, as well as collection and table nodes.
[self layoutIfNeeded];
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If we remove layoutIfNeeded in this case would user with custom ASDisplayNode subclass that relied on the fact that the size was available via bounds / calculatedSize suddenly get an undefined behavior?

They would have to basically do the same as ASTableNode and ASCollectionNode and explicitly allocating the view and trigger a layout if needed if they would like to have the old behavior?

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@maicki Since this sets it in a downward propagation, it wouldn't necessarily have set the bounds on self, unless the parent had done so first.

Assuming the parent had done so, then yes this could be a behavior change. However, using .calculatedSize actually will not change in behavior.

I think it is quite rare to override this method, and even more rare to use .bounds in it. One potential option could be to throw an assertion if a client DOES access .bounds during this call, and to tell them "this probably won't do what you want, use .calculatedLayout.size instead".


if (_methodOverrides & ASDisplayNodeMethodOverrideFetchData) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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6 changes: 3 additions & 3 deletions Source/ASTableNode.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -142,10 +142,10 @@ - (void)interfaceStateDidChange:(ASInterfaceState)newState fromState:(ASInterfac

- (void)didEnterPreloadState
{
// Intentionally allocate the view here so that super will trigger a layout pass on it which in turn will trigger the intial data load.
// We can get rid of this call later when ASDataController, ASRangeController and ASCollectionLayout can operate without the view.
[self view];
[super didEnterPreloadState];
// Intentionally allocate the view here and trigger a layout pass on it, which in turn will trigger the intial data load.
// We can get rid of this call later when ASDataController, ASRangeController and ASCollectionLayout can operate without the view.
[[self view] layoutIfNeeded];
}

#if ASRangeControllerLoggingEnabled
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