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[ASDisplayNode:UIViewBridge] Refactor setFrame: to simplify logic

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This commit is contained in:
Adlai Holler 2016-02-21 10:42:38 -08:00
parent 3ff833c4f5
commit b1c7f47b02
1 changed files with 45 additions and 29 deletions
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74
AsyncDisplayKit/Private/ASDisplayNode+UIViewBridge.mm
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@ -233,37 +233,53 @@ if (shouldApply) { _layer.layerProperty = (layerValueExpr); } else { ASDisplayNo
- (void)setFrame:(CGRect)rect
{
_bridge_prologue_write;
BOOL setFrameDirectly = _flags.synchronous && !_flags.layerBacked;
BOOL isMainThread = ASDisplayNodeThreadIsMain();
BOOL nodeLoaded = __loaded;
if (nodeLoaded && isMainThread && setFrameDirectly) {
// For classes like ASTableNode, ASCollectionNode, ASScrollNode and similar - make sure UIView gets setFrame:
// Frame is only defined when transform is identity because we explicitly diverge from CALayer behavior and define frame without transform
#if DEBUG
// Checking if the transform is identity is expensive, so disable when unnecessary. We have assertions on in Release, so DEBUG is the only way I know of.
ASDisplayNodeAssert(CATransform3DIsIdentity(self.transform), @"-[ASDisplayNode setFrame:] - self.transform must be identity in order to set the frame property. (From Apple's UIView documentation: If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.)");
#endif
_view.frame = rect;
} else if (!nodeLoaded || (isMainThread && !setFrameDirectly)) {
/**
* Sets a new frame to this node by changing its bounds and position. This method can be safely called even if
* the transform is a non-identity transform, because bounds and position can be set instead of frame.
* This is NOT called for synchronous nodes (wrapping regular views), which may rely on a [UIView setFrame:] call.
* A notable example of the latter is UITableView, which won't resize its internal container if only layer bounds are set.
*/
CGRect bounds = CGRectZero;
CGPoint position = CGPointZero;
ASBoundsAndPositionForFrame(rect, self.bounds.origin, self.anchorPoint, &bounds, &position);
self.bounds = bounds;
self.position = position;
} else if (nodeLoaded && !isMainThread) {
_ASPendingState *pendingState = ASDisplayNodeGetPendingState(self);
if (!pendingState.hasChanges) {
[[ASPendingStateController sharedInstance] registerNode:self];
// For classes like ASTableNode, ASCollectionNode, ASScrollNode and similar - make sure UIView gets setFrame:
struct ASDisplayNodeFlags flags = _flags;
BOOL setFrameDirectly = flags.synchronous && !flags.layerBacked;
BOOL nodeLoaded = __loaded;
BOOL isMainThread = ASDisplayNodeThreadIsMain();
if (!setFrameDirectly) {
BOOL canReadProperties = isMainThread || !nodeLoaded;
if (canReadProperties) {
// We don't have to set frame directly, and we can read current properties.
// Compute a new bounds and position and set them on self.
CGRect bounds = CGRectZero;
CGPoint position = CGPointZero;
ASBoundsAndPositionForFrame(rect, self.bounds.origin, self.anchorPoint, &bounds, &position);
self.bounds = bounds;
self.position = position;
} else {
// We don't have to set frame directly, but we can't read properties.
// Store the frame in our pending state, and it'll get decomposed into
// bounds and position when the pending state is applied.
_ASPendingState *pendingState = ASDisplayNodeGetPendingState(self);
if (nodeLoaded && !pendingState.hasChanges) {
[[ASPendingStateController sharedInstance] registerNode:self];
}
pendingState.frame = rect;
}
} else {
if (nodeLoaded && isMainThread) {
// We do have to set frame directly, and we're on main thread with a loaded node.
// Just set the frame on the view.
// NOTE: Frame is only defined when transform is identity because we explicitly diverge from CALayer behavior and define frame without transform.
#if DEBUG
// Checking if the transform is identity is expensive, so disable when unnecessary. We have assertions on in Release, so DEBUG is the only way I know of.
ASDisplayNodeAssert(CATransform3DIsIdentity(self.transform), @"-[ASDisplayNode setFrame:] - self.transform must be identity in order to set the frame property. (From Apple's UIView documentation: If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.)");
#endif
_view.frame = rect;
} else {
// We do have to set frame directly, but either the node isn't loaded or we're on a non-main thread.
// Set the frame on the pending state, and it'll call setFrame: when applied.
_ASPendingState *pendingState = ASDisplayNodeGetPendingState(self);
if (nodeLoaded && !pendingState.hasChanges) {
[[ASPendingStateController sharedInstance] registerNode:self];
}
pendingState.frame = rect;
}
pendingState.frame = rect;
}
}