1. SwipeLayout组件功能介绍
1.1.功能介绍：
SwipeLayout组件是一个侧滑删除组件。
1.2. 模拟器上运行效果：
2. SwipeLayout使用方法
2.1. 新建工程，增加组件Har包依赖
在应用模块中添加HAR，只需要将SwipeLayout.har复制到entry\libs目录下即可(由于build.gradle中已经依赖的libs目录下的*.har，因此不需要再做修改)。
2.2. 修改主页面的布局文件
修改主页面的布局文件ability_main.xml，将自定义的SwipeLayout添加到xml中，将初始状态下展示的视图添加到SwipeLayout作为index为0的子视图：
- "1.0" encoding="utf-8"?>
- xmlns:ohos="http://schemas.huawei.com/res/ohos"
- ohos:id="$+id:total1"
- ohos:height="match_parent"
- ohos:width="match_parent"
- ohos:background_element="gray"
- ohos:orientation="vertical">
-
- ohos:id="$+id:sample2"
- ohos:height="80vp"
- ohos:width="match_parent"
- ohos:orientation="horizontal">
-
- ohos:id="$+id:bottom_layout1"
- ohos:height="match_parent"
- ohos:width="match_parent"
- ohos:background_element="white"
- ohos:multiple_lines="true"
- ohos:padding="10"
- ohos:text="要有最樸素的生活和最遙遠的夢想，即使明天天寒地凍，山高水遠，路遠馬亡。"
- ohos:text_alignment="left"
- ohos:text_size="14fp"
- ohos:visibility="visible">
-
-
- ohos:id="$+id:bottom_wrapper1"
- ohos:height="match_parent"
- ohos:width="360px"
- ohos:background_element="#ddff00"
- ohos:orientation="horizontal"
- ohos:visibility="visible">
-
- ohos:id="$+id:Texts1"
- ohos:height="match_parent"
- ohos:width="180px"
- ohos:background_element="#7B1FA2"
- ohos:left_padding="25"
- ohos:right_padding="25"
- ohos:text="收藏"
- ohos:text_alignment="center"
- ohos:text_color="#DC143C"
- ohos:text_size="14fp"
- ohos:visibility="visible"
- />
-
- ohos:id="$+id:texts2"
- ohos:height="match_parent"
- ohos:width="180px"
- ohos:background_element="#C7C7CC"
- ohos:left_padding="25"
- ohos:right_padding="25"
- ohos:text="删除"
- ohos:text_alignment="center"
- ohos:text_color="#DC143C"
- ohos:text_size="14fp"
- ohos:visibility="visible"
- />
-
-
- ohos:id="$+id:images3"
- ohos:height="match_parent"
- ohos:width="match_parent"
- ohos:background_element="gray"
- ohos:image_src="$media:star"
- />
-
- ohos:id="$+id:bottom_fronts"
- ohos:height="match_parent"
- ohos:width="match_content"
- ohos:background_element="#ddff00"
- ohos:orientation="horizontal"
- ohos:visibility="visible">
-
- ohos:id="$+id:images1"
- ohos:height="match_parent"
- ohos:width="180px"
- ohos:background_element="green"
- ohos:image_src="$media:star"/>
-
- ohos:id="$+id:images2"
- ohos:height="match_parent"
- ohos:width="180px"
- ohos:background_element="red"
- ohos:image_src="$media:trash"/>
-
-
-
- ohos:id="$+id:images"
- ohos:height="match_content"
- ohos:width="match_content"
- ohos:background_element="green"
- ohos:image_src="$media:star"
- ohos:layout_alignment="horizontal_center"
- ohos:top_margin="100vp"/>
-
2.3. 初始化SwipeLayout
在MainAbilitySlince类的onStart函数中，增加如下代码。
- SwipeLayout swipeLayout = (SwipeLayout) findComponentById(ResourceTable.Id_sample1);
- DirectionalLayout right = (DirectionalLayout) findComponentById(ResourceTable.Id_bottom_wrapper);
- //初始化
- swipeLayout.initializeSwipe();
- DirectionalLayout left = (DirectionalLayout) findComponentById(ResourceTable.Id_bottom_front);
- Image image3 = (Image) findComponentById(ResourceTable.Id_image3);
- //将各个方向拖拽时对应展示的视图添加到swipeLayout
- swipeLayout.addDrag(SwipeLayout.DragEdge.Left, right);
- swipeLayout.addDrag(SwipeLayout.DragEdge.Right, left);
- swipeLayout.addDrag(SwipeLayout.DragEdge.Bottom, image3);
3. SwipeLayout开发实现
3.1. 新建一个Module
新建一个Module，类型选择HarmonyOS Library，模块名为SwipeLayout，如图
3.2. 新建一个SwipeLayout类
新建一个SwipeLayout类，继承自PositionLayout类
SwipeLayout的主要流程：
首先通过xml的构造方法，为SwipeLayout添加拖拽监听;
将LinkedHashMap
通过public void addDrag(DragEdge dragEdge, Component child) 方法将可拖拽的方向和对应展示的视图添加到mDragEdges，并设置其初始的ContentPosition;
- public void addDrag(DragEdge dragEdge, Component child) {
- mDragEdges.put(dragEdge, child);
- switch (dragEdge) {
- case Left:
- child.setContentPosition(getWidth(), 0);
- break;
- case Right:
- HiLog.info(label, "Log_addDrag" + child.getHeight());
- child.setContentPosition(-child.getWidth(), 0);
- break;
- case Top:
- child.setContentPosition(0, getHeight());
- break;
- case Bottom:
- child.setContentPosition(0, -child.getHeight());
- break;
- }
- child.setVisibility(INVISIBLE);
- addComponent(child, 0);
- }
在拖拽动作的监听回调方法中完成对视图的更新
A.在update回调中设置打开和关闭的边界以及边界内的位置刷新
- if (getSurfaceView().getContentPositionY() + dragInfo.yOffset <= 0) {
- close();
- } else if (getSurfaceView().getContentPositionY() + dragInfo.yOffset >= getHeight()) {
- open();
- } else {
- getSurfaceView().setContentPositionY(getSurfaceView().getContentPositionY() + (float) dragInfo.yOffset);
- getCurrentBottomView().setContentPositionY(getCurrentBottomView().getContentPositionY() + (float) dragInfo.yOffset);
- }
B.在end中判断滑动的距离，如果大于设定的滑动距离则直接将控件展开或者关闭
- if (isCloseBeforeDrag && mDragDistanceY < 0) {
- if (Math.abs(mDragDistanceY) >= mWillOpenPercentAfterClose * getBottomViewHeight()) {
- open();
- } else {
- close();
- }
- }
- if (!isCloseBeforeDrag && mDragDistanceY > 0) {
- if (Math.abs(mDragDistanceY) >= mWillOpenPercentAfterClose * getBottomViewHeight()) {
- close();
- } else {
- open();
- }
- }
3.3. 编译HAR包
利用Gradle可以将HarmonyOS Library库模块构建为HAR包，构建HAR包的方法如下：
在Gradle构建任务中，双击PackageDebugHar或PackageReleaseHar任务，构建Debug类型或Release类型的HAR。
待构建任务完成后，可以loadingview> bulid > outputs > har目录中，获取生成的HAR包。
项目源代码地址：https://github.com/isoftstone-dev/SwipeBackLayout
欢迎交流：HWIS-HOS@isoftstone.com
