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c700618862
This applies primarily when beginUpdates / endUpdates is not used. Due to user interaction-driven edits, like reloads or adding content at the bottom, sometimes this is unavoidable in app design and thus critical. I have a diff in flight to make ASDataController / ASRangeController robust against very aggressive thrash testing, which will be added both to the unit test suite and this new example project.
58 lines
1.8 KiB
Plaintext
58 lines
1.8 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 to an off-screen window to force display and preserve its contents
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[[self.class workingWindow] addSubnode:node];
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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.view removeFromSuperview];
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[node recursivelyClearContents];
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}
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@end
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