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3f982b5c9a
ASDK layout and display calls don't depend on UIView in any way, so this will reduce UIView-specific overhead from heirarchy manipulation.
62 lines
2.3 KiB
Plaintext
62 lines
2.3 KiB
Plaintext
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "ASRangeHandlerRender.h"
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#import "ASDisplayNode.h"
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#import "ASDisplayNode+Subclasses.h"
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#import "ASDisplayNodeInternal.h"
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@implementation ASRangeHandlerRender
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+ (UIWindow *)workingWindow
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{
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ASDisplayNodeAssertMainThread();
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// we add nodes' views to this invisible window to start async rendering
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// TODO: Replace this with directly triggering display https://github.com/facebook/AsyncDisplayKit/issues/315
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static UIWindow *workingWindow = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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workingWindow = [[UIWindow alloc] initWithFrame:CGRectZero];
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workingWindow.windowLevel = UIWindowLevelNormal - 1000;
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workingWindow.userInteractionEnabled = NO;
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workingWindow.hidden = YES;
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workingWindow.alpha = 0.0;
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});
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return workingWindow;
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}
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- (void)node:(ASDisplayNode *)node enteredRangeOfType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssertMainThread();
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ASDisplayNodeAssert(rangeType == ASLayoutRangeTypeRender, @"Render delegate should not handle other ranges");
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[node recursivelySetDisplaySuspended:NO];
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// Add the node's layer to an off-screen window to trigger display and mark its contents as non-volatile.
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// Use the layer directly to avoid the substantial overhead of UIView heirarchy manipulations.
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// Any view-backed nodes will still create their views in order to assemble the layer heirarchy, and they will
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// also assemble a view subtree for the node, but we avoid the much more significant expense triggered by a view
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// being added or removed from an onscreen window (responder chain setup, will/DidMoveToWindow: recursive calls, etc)
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[[[self.class workingWindow] layer] addSublayer:node.layer];
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}
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- (void)node:(ASDisplayNode *)node exitedRangeOfType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssertMainThread();
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ASDisplayNodeAssert(rangeType == ASLayoutRangeTypeRender, @"Render delegate should not handle other ranges");
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[node recursivelySetDisplaySuspended:YES];
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[node.layer removeFromSuperlayer];
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[node recursivelyClearContents];
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}
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@end
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