| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #import "WXDisplayLinkManager.h" |
| #import <UIKit/UIKit.h> |
| #import "WXAssert.h" |
| |
| @implementation WXDisplayLinkManager |
| { |
| CADisplayLink *_displayLink; |
| NSMutableArray<id<WXDisplayLinkClient>>* _displayArray; |
| } |
| |
| + (instancetype)sharedInstance { |
| WXAssertComponentThread(); |
| |
| static WXDisplayLinkManager *_sharedDisplayLinkManager = nil; |
| static dispatch_once_t onceToken; |
| dispatch_once(&onceToken, ^{ |
| _sharedDisplayLinkManager = [[self alloc] init]; |
| }); |
| [_sharedDisplayLinkManager _startDisplayLink]; |
| return _sharedDisplayLinkManager; |
| } |
| |
| - (instancetype)init |
| { |
| if (self == [super init]) { |
| _displayArray = [NSMutableArray array]; |
| } |
| return self; |
| } |
| |
| - (void)registerDisplayClient:(id<WXDisplayLinkClient>)client |
| { |
| WXAssertComponentThread(); |
| |
| if ([_displayArray containsObject:client]) { |
| return; |
| } |
| [_displayArray addObject:client]; |
| } |
| |
| - (void)unregisterDisplayClient:(id<WXDisplayLinkClient>)client |
| { |
| WXAssertComponentThread(); |
| |
| [_displayArray removeObject:client]; |
| if ([_displayArray count] == 0) { |
| [self _stopDisplayLink]; |
| } |
| } |
| |
| - (void)_startDisplayLink |
| { |
| if (!_displayLink) { |
| _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(_handleDisplayLink)]; |
| [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; |
| } |
| } |
| |
| - (void)_stopDisplayLink |
| { |
| if (_displayLink) { |
| [_displayLink invalidate]; |
| _displayLink = nil; |
| } |
| } |
| |
| - (void)_handleDisplayLink |
| { |
| for (id<WXDisplayLinkClient> client in _displayArray) { |
| if (!client.suspend) { |
| [client handleDisplayLink]; |
| } |
| } |
| } |
| |
| @end |