模板版本：v0.4.0

react-native-shared-element

本项目基于 react-native-shared-element 开发。

该第三方库支持直接从 npm 下载，新的包名为：@react-native-ohos/react-native-shared-element 版本所属关系如下：

1. 安装与使用

进入到工程目录并输入以下命令：

npm

npm install @react-native-ohos/react-native-shared-element

yarn

yarn add @react-native-ohos/react-native-shared-element

下面的代码展示了这个库的基本使用场景：

import * as React from 'react';
import {
  View,
  StyleSheet,
  Animated,
  Dimensions,
  TouchableOpacity,
  Image,
} from 'react-native';
import {
  SharedElement,
  SharedElementTransition,
  nodeFromRef,
} from 'react-native-shared-element';

export default class App extends React.Component {
  state = {
    progress: new Animated.Value(0),
    isScene2Visible: false,
    isInProgress: false,
    scene1Ancestor: null,
    scene1Node: null,
    scene2Ancestor: null,
    scene2Node: null,
  };

  onPressNavigate = () => {
    this.setState({isScene2Visible: true, isInProgress: true});
    Animated.timing(this.state.progress, {
      toValue: 1,
      duration: 1000,
      useNativeDriver: true,
    }).start(() => this.setState({isInProgress: false}));
  };

  onPressBack = () => {
    this.setState({isInProgress: true});
    Animated.timing(this.state.progress, {
      toValue: 0,
      duration: 1000,
      useNativeDriver: true,
    }).start(() =>
      this.setState({isScene2Visible: false, isInProgress: false}),
    );
  };

  onSetScene1Ref = (ref: View | null) => {
    this.setState({scene1Ancestor: nodeFromRef(ref)});
  };

  onSetScene2Ref = (ref: View | null) => {
    this.setState({scene2Ancestor: nodeFromRef(ref)});
  };

  render() {
    const {state} = this;
    const {width} = Dimensions.get('window');
    return (
      <>
        <TouchableOpacity
          style={styles.container}
          activeOpacity={0.5}
          onPress={
            state.isScene2Visible ? this.onPressBack : this.onPressNavigate
          }>
          {/* Scene 1 */}
          <Animated.View
            style={{
              ...StyleSheet.absoluteFillObject,
              transform: [
                {translateX: Animated.multiply(-200, state.progress)},
              ],
            }}>
            <View style={styles.scene} ref={this.onSetScene1Ref}>
              <SharedElement onNode={node => this.setState({scene1Node: node})}>
                <Image
                  style={styles.image1}
                  source={require('本地图片路径')}
                />
              </SharedElement>
            </View>
          </Animated.View>

          {/* Scene 2 */}
          {state.isScene2Visible ? (
            <Animated.View
              style={{
                ...StyleSheet.absoluteFillObject,
                transform: [
                  {
                    translateX: Animated.multiply(
                      -width,
                      Animated.add(state.progress, -1),
                    ),
                  },
                ],
              }}>
              <View style={styles.scene2} ref={this.onSetScene2Ref}>
                <SharedElement
                  onNode={node => this.setState({scene2Node: node})}>
                  <Image
                    style={styles.image2}
                    source={require('本地图片路径')}
                  />
                </SharedElement>
              </View>
            </Animated.View>
          ) : undefined}
        </TouchableOpacity>

        {/* Transition overlay */}
        {state.isInProgress ? (
          <View style={styles.sharedElementOverlay}>
            <SharedElementTransition
              start={{
                node: state.scene1Node,
                ancestor: state.scene1Ancestor,
              }}
              end={{
                node: state.scene2Node,
                ancestor: state.scene2Ancestor,
              }}
              position={state.progress}
              animation="move"
              resize="auto"
              align="auto"
            />
          </View>
        ) : undefined}
      </>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#ecf0f1',
  },
  scene: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: 'white',
    justifyContent: 'center',
    alignItems: 'center',
  },
  scene2: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: '#00d8ff',
    justifyContent: 'center',
    alignItems: 'center',
  },
  image1: {
    width: 160,
    height: 160,
  },
  image2: {
    width: 300,
    height: 300,
  },
  sharedElementOverlay: {
    ...StyleSheet.absoluteFillObject,
  },
});

使用 Codegen

本库已经适配了 Codegen ，在使用前需要主动执行生成三方库桥接代码，详细请参考 Codegen 文档。

2. Link

使用AutoLink的工程需要根据该文档配置，Autolink框架指导文档：https://gitcode.com/openharmony-sig/ohos_react_native/blob/master/docs/zh-cn/Autolinking.md

如您使用的版本支持 Autolink，并且工程已接入 Autolink，可跳过ManualLink配置。

{
  ...
  "overrides": {
    "@rnoh/react-native-openharmony" : "./react_native_openharmony"
  }
}

"dependencies": {
    "@rnoh/react-native-openharmony": "file:../react_native_openharmony",
    "@react-native-ohos/react-native-shared-element": "file:../../node_modules/@react-native-ohos/react-native-shared-element/harmony/shared_element.har"
}

cd entry
ohpm install

project(rnapp)
cmake_minimum_required(VERSION 3.4.1)
set(CMAKE_SKIP_BUILD_RPATH TRUE)
set(RNOH_APP_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
set(NODE_MODULES "${CMAKE_CURRENT_SOURCE_DIR}/../../../../../node_modules")
+ set(OH_MODULES "${CMAKE_CURRENT_SOURCE_DIR}/../../../oh_modules")
set(RNOH_CPP_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../../../../../react-native-harmony/harmony/cpp")
set(LOG_VERBOSITY_LEVEL 1)
set(CMAKE_ASM_FLAGS "-Wno-error=unused-command-line-argument -Qunused-arguments")
set(CMAKE_CXX_FLAGS "-fstack-protector-strong -Wl,-z,relro,-z,now,-z,noexecstack -s -fPIE -pie")
set(WITH_HITRACE_SYSTRACE 1) # for other CMakeLists.txt files to use
add_compile_definitions(WITH_HITRACE_SYSTRACE)

add_subdirectory("${RNOH_CPP_DIR}" ./rn)

# RNOH_BEGIN: manual_package_linking_1
add_subdirectory("../../../../sample_package/src/main/cpp" ./sample-package)

+ add_subdirectory("${OH_MODULES}/@react-native-ohos/react-native-shared-element/src/main/cpp" ./shared-element)
# RNOH_END: manual_package_linking_1

file(GLOB GENERATED_CPP_FILES "./generated/*.cpp")

add_library(rnoh_app SHARED
    ${GENERATED_CPP_FILES}
    "./PackageProvider.cpp"
    "${RNOH_CPP_DIR}/RNOHAppNapiBridge.cpp"
)
target_link_libraries(rnoh_app PUBLIC rnoh)

# RNOH_BEGIN: manual_package_linking_2
target_link_libraries(rnoh_app PUBLIC rnoh_sample_package)
+ target_link_libraries(rnoh_app PUBLIC rnoh_shared_element)
# RNOH_END: manual_package_linking_2

#include "RNOH/PackageProvider.h"
#include "generated/RNOHGeneratedPackage.h"
#include "SamplePackage.h"
+ #include "SharedElementPackage.h"

using namespace rnoh;

std::vector<std::shared_ptr<Package>> PackageProvider::getPackages(Package::Context ctx) {
    return {
        std::make_shared<RNOHGeneratedPackage>(ctx),
        std::make_shared<SamplePackage>(ctx),
+       std::make_shared<SharedElementPackage>(ctx),
    };
}

  ...
+ import { SharedElementPackage } from '@react-native-ohos/react-native-shared-element/ts';

export function createRNPackages(ctx: RNPackageContext): RNPackage[] {
  return [
    new SamplePackage(ctx),
+   new SharedElementPackage(ctx),
  ];
}

2.5. 运行

点击右上角的 sync 按钮

或者在终端执行：

cd entry
ohpm install

然后编译、运行即可。

3. 约束与限制

3.1. 兼容性

本文档内容基于以下环境验证通过：

1. RNOH: 0.72.96; SDK: HarmonyOS 6.0.0 Release SDK; IDE: DevEco Studio 6.0.0.858; ROM: 6.0.0.112;
2. RNOH: 0.72.33; SDK: HarmonyOS NEXT B1; IDE: DevEco Studio: 5.0.3.900; ROM: Next.0.0.71;
3. RNOH: 0.77.18; SDK: HarmonyOS 6.0.0 Release SDK; IDE: DevEco Studio 6.0.0.858; ROM: 6.0.0.112;
4. RNOH: 0.82.22; SDK: HarmonyOS 6.0.0 Release SDK; IDE: DevEco Studio 6.0.0.878; ROM: 6.0.0.130;

4. 属性

SharedElement

SharedElementTransition

SharedElementAnimation

SharedElementResize

SharedElementAlign

5. 遗留问题

• SharedElementTransition中的align属性，鸿蒙侧对标iOS已实现，无法看出效果。当前实现无效果的原因是因为图片占据容器全部位置，无法体现效果。如果扩大容器，在使用时，图片有可能会移出屏幕外，影响使用效果。issue#3

6. 其他

7. 开源协议

本项目基于 The MIT License (MIT) ，请自由地享受和参与开源。