零基础学鸿蒙编程-UI控件_DependentLayout 原创 精华

发布于 2021-12-2 21:29
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什么是DependentLayout

DependentLayout又称依赖布局,是鸿蒙开发中几个常用的布局之一,使用频率最高.支持相对于父控件或同级兄弟控件进行定位.

基础样例

1. 相对父控件定位

效果图

零基础学鸿蒙编程-UI控件_DependentLayout-开源基础软件社区

代码

<?xml version="1.0" encoding="utf-8"?>
<DependentLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="$media:beauty">

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:padding="20vp"
        ohos:text="左上"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_parent_end="true"
        ohos:background_element="#000000"
        ohos:padding="20vp"
        ohos:text="右上"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:center_in_parent="true"
        ohos:padding="20vp"
        ohos:text="正中间"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_parent_bottom="true"
        ohos:background_element="#000000"
        ohos:padding="20vp"
        ohos:text="左下"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_parent_bottom="true"
        ohos:align_parent_end="true"
        ohos:background_element="#000000"
        ohos:padding="20vp"
        ohos:text="右下"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>
</DependentLayout>

2. 相对同级兄弟控件对齐

设置本控件的一侧和目标控件(同级兄弟控件)的同侧对齐,如左侧对齐、右侧对齐.

效果图

零基础学鸿蒙编程-UI控件_DependentLayout-开源基础软件社区

代码

<?xml version="1.0" encoding="utf-8"?>
<DependentLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="$media:beauty">

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_left="$id:center_text"
        ohos:background_element="#000000"
        ohos:text="左对齐"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_right="$id:center_text"
        ohos:background_element="#000000"
        ohos:text="右对齐"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:id="$+id:center_text"
        ohos:height="200vp"
        ohos:width="200vp"
        ohos:background_element="#80000000"
        ohos:center_in_parent="true"
        ohos:text="正中间"
        ohos:text_alignment="center"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_top="$id:center_text"
        ohos:background_element="#000000"
        ohos:text="上对齐"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:align_bottom="$id:center_text"
        ohos:background_element="#000000"
        ohos:text="下对齐"
        ohos:text_color="#FFFFFF"
        ohos:text_size="20fp"/>
</DependentLayout>

完整源代码

https://gitee.com/hspbc/harmonyos_demos/tree/master/dependentLayoutDemo

常用属性说明

属性名 用途
ohos:width 设置控件宽度,可设置为:match_parent(和父控件一样),match_content(按照内容自动伸缩),设置固定值(如200vp)
ohos:height 设置控件高度,可设置为:match_parent(和父控件一样),match_content(按照内容自动伸缩),设置固定值(如200vp)
ohos:layout_alignment 在父控件内对齐方式,可选值:left:居左;start:居左;center:居中;right:居右;end:居右;top:居上;bottom:居下;horizontal_center:水平居中;vertical_center:垂直居中
ohos:background_element 设置背景,可以是色值(如#FF0000)或图片等
ohos:visibility 可选值: visible(显示), invisible(隐藏,但是仍占据UI空间),hide(隐藏,且不占UI空间)
ohos:above 当前控件整体位于目标控件之上.
ohos:below 当前控件整体位于目标控件之下.
ohos:align_left 和目标控件左对齐.
ohos:align_start 和目标控件左对齐.
ohos:align_right 和目标控件右对齐.
ohos:align_end 和目标控件右对齐.
ohos:align_top 和目标控件上对齐.
ohos:align_bottom 和目标控件下对齐.
ohos:center_in_parent 设置是否在父控件中居中(横向和纵向).
ohos:align_parent_left 设置是否和父控件左对齐.
ohos:align_parent_start 设置是否和父控件左对齐.
ohos:align_parent_right 设置是否和父控件右对齐.
ohos:align_parent_end 设置是否和父控件右对齐.
ohos:align_parent_top 设置是否和父控件上对齐.
ohos:align_parent_bottom 设置是否和父控件下对齐.

更多属性及实际效果,可以在开发工具里自行体验.

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