mirror of
https://github.com/zhigang1992/react-native.git
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00eab3d6fb
Summary: ComponentDescriptorProvider represents unified way to create a particular descriptor. Now all ComponentViews (which support RCTComponentViewProtocol) expose a `ComponentDescriptorProvider` which will allow creating and registering ComponentDescriptor instances for all visual components automatically as a part of ComponentView registration process. Don't panic, everything is still being as explicit as it always was, no magic involved; we just will have only one registration step instead of two parallel. That also opens a way to register components on the fly. Reviewed By: JoshuaGross Differential Revision: D14963488 fbshipit-source-id: 9e9d9166fabaf7b30b35b8647faa6e3a19cd2435
92 lines
2.5 KiB
Plaintext
92 lines
2.5 KiB
Plaintext
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTSwitchComponentView.h"
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#import <react/components/rncore/ComponentDescriptors.h>
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#import <react/components/rncore/EventEmitters.h>
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#import <react/components/rncore/Props.h>
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using namespace facebook::react;
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@implementation RCTSwitchComponentView {
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UISwitch *_switchView;
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BOOL _wasOn;
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}
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- (instancetype)initWithFrame:(CGRect)frame
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{
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if (self = [super initWithFrame:frame]) {
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static const auto defaultProps = std::make_shared<const SwitchProps>();
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_props = defaultProps;
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_switchView = [[UISwitch alloc] initWithFrame:self.bounds];
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[_switchView addTarget:self action:@selector(onChange:) forControlEvents:UIControlEventValueChanged];
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_switchView.on = defaultProps->value;
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self.contentView = _switchView;
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}
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return self;
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}
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#pragma mark - RCTComponentViewProtocol
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+ (ComponentDescriptorProvider)componentDescriptorProvider
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{
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return concreteComponentDescriptorProvider<SwitchComponentDescriptor>();
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}
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- (void)updateProps:(SharedProps)props oldProps:(SharedProps)oldProps
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{
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const auto &oldSwitchProps = *std::static_pointer_cast<const SwitchProps>(oldProps ?: _props);
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const auto &newSwitchProps = *std::static_pointer_cast<const SwitchProps>(props);
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[super updateProps:props oldProps:oldProps];
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// `value`
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if (oldSwitchProps.value != newSwitchProps.value) {
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_switchView.on = newSwitchProps.value;
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_wasOn = newSwitchProps.value;
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}
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// `disabled`
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if (oldSwitchProps.disabled != newSwitchProps.disabled) {
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_switchView.enabled = !newSwitchProps.disabled;
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}
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// `tintColor`
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if (oldSwitchProps.tintColor != newSwitchProps.tintColor) {
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_switchView.tintColor = [UIColor colorWithCGColor:newSwitchProps.tintColor.get()];
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}
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// `onTintColor
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if (oldSwitchProps.onTintColor != newSwitchProps.onTintColor) {
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_switchView.onTintColor = [UIColor colorWithCGColor:newSwitchProps.onTintColor.get()];
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}
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// `thumbTintColor`
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if (oldSwitchProps.thumbTintColor != newSwitchProps.thumbTintColor) {
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_switchView.thumbTintColor = [UIColor colorWithCGColor:newSwitchProps.thumbTintColor.get()];
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}
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}
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- (void)onChange:(UISwitch *)sender
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{
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if (_wasOn == sender.on) {
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return;
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}
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_wasOn = sender.on;
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std::dynamic_pointer_cast<const SwitchEventEmitter>(_eventEmitter)
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->onChange(SwitchOnChangeStruct{.value = static_cast<bool>(sender.on)});
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}
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@end
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