mirror of
https://github.com/zhigang1992/react-native.git
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c79db53a9a
Summary: The new method is being called right after all update methods were called for a particular component view. It is useful for performing updates that require knowledge of several independent aspects of the compound mounting change (e.g. props *and* layout constraints). Reviewed By: JoshuaGross Differential Revision: D14896801 fbshipit-source-id: 485d8c97d81d7a2ad7a7afc209094c328da6ef3c
102 lines
3.3 KiB
Plaintext
102 lines
3.3 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 "UIView+ComponentViewProtocol.h"
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#import <React/RCTAssert.h>
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#import <React/RCTLog.h>
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#import <React/RCTUtils.h>
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#import "RCTConversions.h"
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using namespace facebook::react;
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@implementation UIView (ComponentViewProtocol)
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- (void)mountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView index:(NSInteger)index
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{
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[self insertSubview:childComponentView atIndex:index];
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}
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- (void)unmountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView index:(NSInteger)index
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{
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RCTAssert(childComponentView.superview == self, @"Attempt to unmount improperly mounted component view.");
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[childComponentView removeFromSuperview];
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}
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- (void)updateProps:(SharedProps)props oldProps:(SharedProps)oldProps
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{
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// Default implementation does nothing.
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}
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- (void)updateEventEmitter:(SharedEventEmitter)eventEmitter
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{
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// Default implementation does nothing.
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}
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- (void)updateLocalData:(SharedLocalData)localData oldLocalData:(SharedLocalData)oldLocalData
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{
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// Default implementation does nothing.
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}
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- (void)updateState:(facebook::react::State::Shared)state oldState:(facebook::react::State::Shared)oldState
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{
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// Default implementation does nothing.
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}
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- (void)updateLayoutMetrics:(LayoutMetrics)layoutMetrics oldLayoutMetrics:(LayoutMetrics)oldLayoutMetrics
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{
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if (layoutMetrics.frame != oldLayoutMetrics.frame) {
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CGRect frame = RCTCGRectFromRect(layoutMetrics.frame);
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if (std::isnan(frame.origin.x) || std::isnan(frame.origin.y) || std::isnan(frame.size.width) ||
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std::isnan(frame.size.height) || std::isinf(frame.origin.x) || std::isinf(frame.origin.y) ||
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std::isinf(frame.size.width) || std::isinf(frame.size.height)) {
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// CALayer will crash if we pass NaN or Inf values.
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// It's unclear how to detect this case on cross-platform manner holistically, so we have to do it on the mounting
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// layer as well. NaN/Inf is a kinda valid result of some math operations. Even if we can (and should) detect (and
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// report early) incorrect (NaN and Inf) values which come from JavaScript side, we sometimes cannot backtrace the
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// sources of a calculation that produced an incorrect/useless result.
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RCTLogWarn(
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@"-[UIView(ComponentViewProtocol) updateLayoutMetrics:oldLayoutMetrics:]: Received invalid layout metrics (%@) for a view (%@).",
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NSStringFromCGRect(frame),
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self);
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return;
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}
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self.frame = frame;
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}
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if (layoutMetrics.layoutDirection != oldLayoutMetrics.layoutDirection) {
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self.semanticContentAttribute = layoutMetrics.layoutDirection == LayoutDirection::RightToLeft
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? UISemanticContentAttributeForceRightToLeft
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: UISemanticContentAttributeForceLeftToRight;
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}
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if (layoutMetrics.displayType != oldLayoutMetrics.displayType) {
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self.hidden = layoutMetrics.displayType == DisplayType::None;
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}
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}
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- (void)finalizeUpdates:(RNComponentViewUpdateMask)updateMask
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{
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// Default implementation does nothing.
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}
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- (void)prepareForRecycle
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{
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// Default implementation does nothing.
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}
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- (facebook::react::SharedProps)props
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{
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RCTAssert(NO, @"props access should be implemented by RCTViewComponentView.");
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return nullptr;
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}
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@end
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