mirror of
https://github.com/zhigang1992/react-native.git
synced 2026-04-03 17:45:12 +08:00
64a52532fe
Summary: This adds a callback for <Text> to get metrics about the rendered text. It's divided by line but that could be changed to "fragments" (which makes more sense for multi-lingual). Right now by line is convenient as you frequently want to know where the first and last line end (though we could make this work with fragments I suppose). Reviewed By: shergin Differential Revision: D9440914 fbshipit-source-id: bb011bb7a52438380d3f604ffe7019b98c18d978
99 lines
2.7 KiB
Objective-C
99 lines
2.7 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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 "RCTTextViewManager.h"
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#import <React/RCTAccessibilityManager.h>
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#import <React/RCTShadowView+Layout.h>
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#import <React/RCTShadowView.h>
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#import <React/RCTUIManager.h>
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#import <React/RCTUIManagerUtils.h>
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#import <React/RCTUIManagerObserverCoordinator.h>
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#import "RCTTextShadowView.h"
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#import "RCTTextView.h"
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@interface RCTTextViewManager () <RCTUIManagerObserver>
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@end
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@implementation RCTTextViewManager
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{
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NSHashTable<RCTTextShadowView *> *_shadowViews;
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CGFloat _fontSizeMultiplier;
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}
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RCT_EXPORT_MODULE(RCTText)
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RCT_REMAP_SHADOW_PROPERTY(numberOfLines, maximumNumberOfLines, NSInteger)
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RCT_REMAP_SHADOW_PROPERTY(ellipsizeMode, lineBreakMode, NSLineBreakMode)
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RCT_REMAP_SHADOW_PROPERTY(adjustsFontSizeToFit, adjustsFontSizeToFit, BOOL)
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RCT_REMAP_SHADOW_PROPERTY(minimumFontScale, minimumFontScale, CGFloat)
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RCT_EXPORT_SHADOW_PROPERTY(onTextLayout, RCTDirectEventBlock)
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RCT_EXPORT_VIEW_PROPERTY(selectable, BOOL)
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- (void)setBridge:(RCTBridge *)bridge
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{
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[super setBridge:bridge];
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_shadowViews = [NSHashTable weakObjectsHashTable];
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[bridge.uiManager.observerCoordinator addObserver:self];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(handleDidUpdateMultiplierNotification)
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name:RCTAccessibilityManagerDidUpdateMultiplierNotification
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object:bridge.accessibilityManager];
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (UIView *)view
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{
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return [RCTTextView new];
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}
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- (RCTShadowView *)shadowView
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{
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RCTTextShadowView *shadowView = [[RCTTextShadowView alloc] initWithBridge:self.bridge];
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shadowView.textAttributes.fontSizeMultiplier = self.bridge.accessibilityManager.multiplier;
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[_shadowViews addObject:shadowView];
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return shadowView;
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}
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#pragma mark - RCTUIManagerObserver
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- (void)uiManagerWillPerformMounting:(__unused RCTUIManager *)uiManager
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{
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for (RCTTextShadowView *shadowView in _shadowViews) {
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[shadowView uiManagerWillPerformMounting];
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}
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}
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#pragma mark - Font Size Multiplier
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- (void)handleDidUpdateMultiplierNotification
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{
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CGFloat fontSizeMultiplier = self.bridge.accessibilityManager.multiplier;
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NSHashTable<RCTTextShadowView *> *shadowViews = _shadowViews;
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RCTExecuteOnUIManagerQueue(^{
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for (RCTTextShadowView *shadowView in shadowViews) {
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shadowView.textAttributes.fontSizeMultiplier = fontSizeMultiplier;
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[shadowView dirtyLayout];
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}
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[self.bridge.uiManager setNeedsLayout];
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});
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}
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@end
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