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鸿蒙开源三方组件--跨平台自适应布局yoga组件

介绍

yoga是facebook打造的一个跨IOS、Android、Window平台在内的布局引擎,兼容Flexbox布局方式,让界面更加简单。
Yoga官网:https://facebook.github.io/yoga/

官网上描述的特性包括:

  • 完全兼容Flexbox布局,遵循W3C的规范

  • 支持java、C#、Objective-C、C四种语言

  • 底层代码使用C语言编写,性能不是问题

  • 支持流行框架如React Native

目前在已开源的鸿蒙组件(https://gitee.com/openharmony-tpc/yoga)的功能现状如下:

  • native层和接口已经打通

  • 支持自定义xml属性来控制布局(通过YogaLayout)

  • 设置布局中不支持Image控件(onDrawCanvas暂不支持主动回调,所以yoga没办法扫描到它),请使用Text控件替代

  • 不支持VirtualYogaLayout

如何使用

首先我们在MAInAbility中定义界面路由

public class MainAbility extends Ability {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setMainRoute(MainAbilitySlice.class.getName());
        addActionRoute("action.dydrawnode.slice", DynamicsDrawNodeSlice.class.getName());
        addActionRoute("action.showrow.slice", ShowRowAbilitySlice.class.getName());
        addActionRoute("action.inflate.slice", BenchmarkInflateAbilitySlice.class.getName());
    }}1.2.3.4.5.6.7.8.9.10.1.2.3.4.5.6.7.8.9.10.

然后我们来到MainAbilitySlice,其实就是做了一个向其他界面跳转的动作,并提前加载yoga的so库

public class MainAbilitySlice extends AbilitySlice {



    static {
        System.loadLibrary("yoga");
        System.loadLibrary("yogacore");
        System.loadLibrary("fb");
    }



    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        setUIContent(ResourceTable.Layout_main_layout);

        Button btn0= (Button) findComponentById(ResourceTable.Id_btn_1);
        btn0.setClickedListener(component -> {
            Intent intent1 = new Intent();
            Operation operation = new Intent.OperationBuilder()
                    .withAction("action.dydrawnode.slice")
                    .build();
            intent1.setOperation(operation);
            startAbilityForResult(intent1, 1);
        });

        Button btn2= (Button) findComponentById(ResourceTable.Id_btn_2);
        btn2.setClickedListener(component -> {
            Intent intent1 = new Intent();
            Operation operation = new Intent.OperationBuilder()
                    .withAction("action.showrow.slice")
                    .build();
            intent1.setOperation(operation);
            startAbilityForResult(intent1, 1);
        });

        Button btn1= (Button) findComponentById(ResourceTable.Id_btn_3);
        btn1.setClickedListener(component -> {
            Intent intent1 = new Intent();
            Operation operation = new Intent.OperationBuilder()
                    .withAction("action.inflate.slice")
                    .build();
            intent1.setOperation(operation);
            startAbilityForResult(intent1, 1);
        });

    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.

第一个演示界面

这里yoga向我们展示了动态布局的能力,效果图如下:

实现的代码如下:

public class DynamicsDrawNodeSlice extends AbilitySlice {


    private static final int VIEW_WIDTH = 200;
    private static final int VIEW_HEIGHT = 200;

    private ArrayList<Component> mViewList = new ArrayList<>();
    private ArrayList<YogaNode> mYogaNodeList = new ArrayList<>();

    private int[][] colors = new int[][]{
            new int[]{0xff6200ea, 0xff651fff, 0xff7c4dff, 0xffb388ff},
            new int[]{0xffd50000, 0xffff1744, 0xffff5252, 0xffff8a80},
            new int[]{0xffc51162, 0xfff50057, 0xffff4081, 0xffff80ab},
            new int[]{0xffaa00ff, 0xffd500f9, 0xffe040fb, 0xffea80fc}
    };

    @Override
    protected void onStart(Intent intent) {
        super.onStart(intent);
        PositionLayout container = new PositionLayout(this);
        DisplayAttributes displayAttributes = DisplayManager.getInstance().getDefaultDisplay(this).get().getAttributes();
        float screenWidth = displayAttributes.width;
        float screenHeight = displayAttributes.height;
        YogaNode root = new YogaNodeJNIFinalizer();
        root.setWidth(screenWidth);
        root.setHeight(screenHeight);
        root.setFlexDirection(YogaFlexDirection.COLUMN);

        createRowNodeAndView(root, 0);
        createRowNodeAndView(root, 1);
        createRowNodeAndView(root, 2);
        createRowNodeAndView(root, 3);

        root.calculateLayout(screenWidth, screenHeight);

        for (int i = 0; i < mViewList.size(); i++) {
            Component component = mViewList.get(i);
            YogaNode yogaNode = mYogaNodeList.get(i);
            YogaNode yogaNodeOwner = yogaNode.getOwner();
            component.setTranslationX(yogaNodeOwner.getLayoutX() + yogaNodeOwner.getLayoutX());
            component.setTranslationY(yogaNodeOwner.getLayoutY() + yogaNodeOwner.getLayoutY());
            component.setLeft((int) (yogaNodeOwner.getLayoutX() + yogaNode.getLayoutX()));
            component.setTop((int) (yogaNodeOwner.getLayoutY() + yogaNode.getLayoutY()));
            container.addComponent(component);
        }

        super.setUIContent(container);
    }

    private void createRowNodeAndView(YogaNode root, int index) {
        YogaNode row = new YogaNodeJNIFinalizer();
        row.setHeight(VIEW_HEIGHT);
        row.setWidth(VIEW_WIDTH * 4);
        row.setFlexDirection(YogaFlexDirection.ROW);
        row.setMargin(YogaEdge.ALL, 20);

        for (int i = 0; i < 4; i++) {
            YogaNode yogaNode = new YogaNodeJNIFinalizer();
            yogaNode.setWidth(VIEW_WIDTH);
            yogaNode.setHeight(VIEW_HEIGHT);
            Component component = createView(colors[index][i]);
            row.addChildAt(yogaNode, i);
            mYogaNodeList.add(yogaNode);
            mViewList.add(component);
        }

        root.addChildAt(row, index);
    }

    private Component createView(int color) {
        Component view = new Component(this);
        ShapeElement background = new ShapeElement();
        background.setRgbColor(convertColor(color));
        view.setBackground(background);
        ComponentContainer.LayoutConfig layoutConfig = new AdaptiveBoxLayout.LayoutConfig(VIEW_WIDTH, VIEW_HEIGHT);
        view.setLayoutConfig(layoutConfig);
        return view;
    }

    /**
     *  转换颜色
     * @param color
     * @return RgbColor
     */
    public RgbColor convertColor(int color) {
        int colorInt = color;
        int red = (colorInt & 0xff0000) >> 16;
        int green = (colorInt & 0x00ff00) >> 8;
        int blue = (colorInt & 0x0000ff);
        return new RgbColor(red, green, blue);
    }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.86.87.88.89.90.91.92.1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.86.87.88.89.90.91.92.

代码中定义了一个root根布局,宽高为屏幕的宽高,接着定义了四个行布局,并向每个行布局里添加4个子布局,最重要的是在调用root.calculateLayout(screenWidth, screenHeight)后,便将每个子布局的位置给确定了下来,然后根据获取到的每个布局的参数,给每个Component设置位置。该演示只是借助yoga组件来确定每个Component位置,真正使渲染生效的还是基于鸿蒙的原生控件。

第二个演示界面

接下来展示如何使用yoga组件在xml里通过填写属性来控制item位置的能力,效果图如下:

代码如下:

<?xml version="1.0" encoding="utf-8" ?><com.facebook.yoga.openharmony.YogaLayout
       xmlns:ohos="http://schemas.huawei.com/res/ohos"
       xmlns:yoga="http://schemas.huawei.com/apk/res-auto"
       ohos:height="match_parent"
       ohos:width="match_parent">

   <com.facebook.yoga.openharmony.YogaLayout
           ohos:height="60vp"
           ohos:width="match_content"
           yoga:yg_alignItems="center"
           yoga:yg_flexDirection="row"
           yoga:yg_marginHorizontal="15"
           yoga:yg_marginStart="15"
           yoga:yg_marginTop="50"
           ohos:background_element="$graphic:item_element"
   >


       <Text
               ohos:height="50vp"
               ohos:width="50vp"
               ohos:background_element="$media:icon"
               yoga:yg_flex="0"
               yoga:yg_marginStart="15"
       />


       <Text
               ohos:height="50vp"
               ohos:width="220vp"
               ohos:text="Hello.  I am Yoga!"
               ohos:text_color="#000000"
               yoga:yg_flex="1"
               yoga:yg_marginStart="15"
               ohos:text_size="20fp"
       />
   </com.facebook.yoga.openharmony.YogaLayout>

   <com.facebook.yoga.openharmony.YogaLayout
           ohos:background_element="$graphic:item_element"
           ohos:height="60vp"
           ohos:width="match_content"
           yoga:yg_alignItems="center"
           yoga:yg_flexDirection="row"
           yoga:yg_marginHorizontal="15"
           yoga:yg_marginTop="20"
           yoga:yg_marginStart="15"
   >


       <Text
               ohos:height="50vp"
               ohos:width="50vp"
               ohos:background_element="$media:icon"
               yoga:yg_flex="0"
               yoga:yg_marginStart="15"
       />

       <Text
               ohos:height="50vp"
               ohos:width="250vp"
               ohos:text="I am a layout engine!"
               ohos:text_color="#000000"
               yoga:yg_flex="1"
               yoga:yg_marginStart="15"
               ohos:text_size="20fp"
       />
   </com.facebook.yoga.openharmony.YogaLayout>

   <com.facebook.yoga.openharmony.YogaLayout
           ohos:background_element="$graphic:item_element"
           ohos:height="60vp"
           ohos:width="match_content"
           yoga:yg_alignItems="center"
           yoga:yg_flexDirection="row"
           yoga:yg_marginHorizontal="15"
           yoga:yg_marginTop="20"
   >

       <Text
               ohos:height="50vp"
               ohos:width="50vp"
               ohos:background_element="$media:icon"
               yoga:yg_flex="0"
               yoga:yg_marginStart="15"
       />

       <Text
               ohos:height="50vp"
               ohos:width="250vp"
               ohos:text="I run natively."
               ohos:text_color="#000000"
               yoga:yg_flex="1"
               yoga:yg_marginStart="15"
               ohos:text_size="20fp"
       />
   </com.facebook.yoga.openharmony.YogaLayout>

   <com.facebook.yoga.openharmony.YogaLayout
           ohos:background_element="$graphic:item_element"
           ohos:height="60vp"
           ohos:width="match_content"
           yoga:yg_alignItems="center"
           yoga:yg_flexDirection="row"
           yoga:yg_marginHorizontal="15"
           yoga:yg_marginTop="20"
   >

       <Text
               ohos:height="50vp"
               ohos:width="50vp"
               ohos:background_element="$media:icon"
               yoga:yg_flex="0"
       />

       <Text
               ohos:height="50vp"
               ohos:width="200vp"
               ohos:text="So I\'m fast."
               ohos:text_color="#000000"
               yoga:yg_flex="1"
               yoga:yg_marginStart="15"
               ohos:text_size="20fp"
       />
   </com.facebook.yoga.openharmony.YogaLayout>

   <com.facebook.yoga.openharmony.YogaLayout
           ohos:background_element="$graphic:item_element"
           ohos:height="60vp"
           ohos:width="match_content"
           yoga:yg_alignItems="center"
           yoga:yg_flexDirection="row"
           yoga:yg_marginHorizontal="15"
           yoga:yg_marginTop="20"
   >

       <Text
               ohos:height="50vp"
               ohos:width="50vp"
               ohos:background_element="$media:icon"
               yoga:yg_flex="0"
       />

       <Text
               ohos:height="50vp"
               ohos:width="200vp"
               ohos:text="Who are you?"
               ohos:text_color="#000000"
               yoga:yg_flex="1"
               yoga:yg_marginStart="15"
               ohos:text_size="20fp"
       />
   </com.facebook.yoga.openharmony.YogaLayout></com.facebook.yoga.openharmony.YogaLayout>1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.86.87.88.89.90.91.92.93.94.95.96.97.98.99.100.101.102.103.104.105.106.107.108.109.110.111.112.113.114.115.116.117.118.119.120.121.122.123.124.125.126.127.128.129.130.131.132.133.134.135.136.137.138.139.140.141.142.143.144.145.146.147.148.149.150.151.152.153.154.155.156.157.1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.86.87.88.89.90.91.92.93.94.95.96.97.98.99.100.101.102.103.104.105.106.107.108.109.110.111.112.113.114.115.116.117.118.119.120.121.122.123.124.125.126.127.128.129.130.131.132.133.134.135.136.137.138.139.140.141.142.143.144.145.146.147.148.149.150.151.152.153.154.155.156.157.

这里YogaLayout其实可以看成FlexBox(详情请参考附录:FlexBox科普),可以通过参数调节子布局位置,我们可以使用YogaLayout上的yoga:yg_alignItems="center"属性使得item居中显示,并通过yoga:yg_flexDirection="row"属性使得之item横向排列。子item也可以通过设置yoga:yg_flex="1"来调整自己的权重。更多属性的使用大家也可以下载项目亲自体验。

集成方式

自行编译工程entity、yoga、yoga_layout、fb生成libyoga.so、libfb.so、libyogacore.so
将其添加到要集成的libs文件夹内,在entity的gradle内添加如下代码。

方式一:
通过library生成har包,添加har包到libs文件夹内。
在entry的gradle内添加如下代码:

implementation fileTree(dir:'libs', include:['*.jar','*.har'])1.1.

方式二:

allprojects{
	repositories{
		mavenCentral()
	}
}
implementation 'io.openharmony.tpc.thirdlib:yoga-layout:1.0.0'
implementation 'io.openharmony.tpc.thirdlib:yoga-yoga:1.0.0'
implementation 'io.openharmony.tpc.thirdlib:yoga-fb:1.0.0'1.2.3.4.5.6.7.8.1.2.3.4.5.6.7.8.

附录1:FlexBox科普

布局的传统解决方案,基于盒状模型,依赖display属性,position属性,float属性。它对于那些特殊布局非常不方便,比如,垂直居中就不容易实现。2009年,W3C提出了一种新的方案:flex。可以简便、完整、响应式地实现各种界面布局。目前,该方案已经得到了所有浏览器的支持。采用Flex布局的元素,称为Flex容器(flex container),简称“容器”。它的所有子元素置动成为容器成员,称为Flex项目(flex item),简称“项目”。

容器默认存在两根轴:水平的主轴(main axis)和垂直的交叉轴(cross axis)。主轴的开始位置(与边框的交叉点)叫main start,结束位置叫main end;交叉轴的开始位置叫cross start,结束位置叫cross end。项目默认沿主轴排列。单个项目占据的主轴空间叫main size,占据的交叉轴空间叫cross size。

附录2:相关资料


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在我们日常生活中,我们会使用电脑来存储各种各样的文件,例如:我们写过的文档、做过的表格、甚至我们下载的教学内容。不过随着时间的推移,往往我们会忘记曾下载的内容/写过的文档它们的所在路径。这时候可能有小伙伴会想到用电脑自带的文件搜索功能去搜索被遗忘的文件,可令人扎心的是电脑系统自带的文件搜索不仅效率极...

Windows 11下载链接

Windows 11下载链接

下面是下载链接(此为英文版,不熟悉安装过程的小伙伴还请酌情安装,安装完成后可自行加装中文语言包)版本名称:Windows 11 消费者版 ( 含家庭版 / 专业版 / 专业工作站 / 家庭单语言版 )文件名称:21996.1.210529-1541.co_release_CLIENT_CONSUME...

Windows11升级你需要关注的事项!停在35%的解决方法

Windows11升级你需要关注的事项!停在35%的解决方法

从前天微软推出Windows后,很多用户已经在第一时间尝鲜体验了Win11,不过升级系统所需要的最低硬件要求把许多热情的用户拒之门外,今天我们简单介绍一下如何升级Win11以及Win11的使用初体验。升级教程首先我们找到设置里面Windows预览体验计划,如果我们没有满足Win11的升级条件,系统不...

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