[ASDisplayNode] Don't force a layout pass on a visible node that enters preload state #751
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nguyenhuy
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appleguy
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Jan 17, 2018
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Thanks for the review, @appleguy. |
nguyenhuy
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Jan 31, 2018
…hat enters preload state (TextureGroup#751)" This reverts commit 2e98588.
nguyenhuy
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Jan 31, 2018
…nters preload state (#779) This reverts commit 2e98588 (#751). The reason we can't wait for the coming CA's layout pass is that cell node visibility events occur before the pass, at which time the cell's subnodes don't have correct frames for impression tracking. The root cause of this problem is that, right now, cell node visible states are set by ASRangeController well before the layout pass of the hosting collection/table view. That means we're "jumping the gun". The more I think about this, the more I agree with @Adlai-Holler that we need to treat visible state differently. That is, a node should only be visible (and thus get visibility events) after it's fully loaded, it's view/layer attached to the hierarchy and laid out by a CA transaction. In other words, at the end of the CA layout pass. Such change needs time and effort to be thoroughly reviewed and tested. Until then, let's roll with this fix.
Adlai-Holler
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Jan 31, 2018
…nters preload state (#779) This reverts commit 2e98588 (#751). The reason we can't wait for the coming CA's layout pass is that cell node visibility events occur before the pass, at which time the cell's subnodes don't have correct frames for impression tracking. The root cause of this problem is that, right now, cell node visible states are set by ASRangeController well before the layout pass of the hosting collection/table view. That means we're "jumping the gun". The more I think about this, the more I agree with @Adlai-Holler that we need to treat visible state differently. That is, a node should only be visible (and thus get visibility events) after it's fully loaded, it's view/layer attached to the hierarchy and laid out by a CA transaction. In other words, at the end of the CA layout pass. Such change needs time and effort to be thoroughly reviewed and tested. Until then, let's roll with this fix.
bernieperez
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Apr 25, 2018
…rs preload state (TextureGroup#751) - After TextureGroup#706, a layout pass is forced on an ASM-enabled node that enters preload state to make sure that its subnodes can start preloading as well. However, when the node is visible, a (coalesced, thus more efficient) layout pass will be triggered by CA soon anyways, so rely on it instead.
bernieperez
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Apr 25, 2018
…nters preload state (TextureGroup#779) This reverts commit 2e98588 (TextureGroup#751). The reason we can't wait for the coming CA's layout pass is that cell node visibility events occur before the pass, at which time the cell's subnodes don't have correct frames for impression tracking. The root cause of this problem is that, right now, cell node visible states are set by ASRangeController well before the layout pass of the hosting collection/table view. That means we're "jumping the gun". The more I think about this, the more I agree with @Adlai-Holler that we need to treat visible state differently. That is, a node should only be visible (and thus get visibility events) after it's fully loaded, it's view/layer attached to the hierarchy and laid out by a CA transaction. In other words, at the end of the CA layout pass. Such change needs time and effort to be thoroughly reviewed and tested. Until then, let's roll with this fix.
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After #706, a layout pass is forced on an ASM-enabled node that enters preload state to make sure that its subnodes can start preloading as well. However, when the node is visible, a (coalesced, thus more efficient) layout pass will be triggered by CA soon anyways, so rely on it instead.