鸿蒙 Text 控件的各种用法

2022-03-21  本文已影响0人  xq9527

Text

Text是用来显示字符串的组件,在界面上显示为一块文本区域。Text作为一个基本组件,有很多扩展,常见的有按钮组件Button,文本编辑组件TextField。

支持的XML属性

Text的共有XML属性继承自:Component

image.png

创建Text

这里主要讲到的都是 以xml形式为例 java 代码创建也是可以的
在layout目录下的xml文件中创建Text组件。

<Text
    ohos:id="$+id:text"
    ohos:width="match_content"
    ohos:height="match_content"
    ohos:text="Text"/>

Java 代码创建text

     //创建组件
        Text text=new Text(getContext());
        //设置组件大小
        text.setWidth(ComponentContainer.LayoutConfig.MATCH_CONTENT);
        text.setHeight(ComponentContainer.LayoutConfig.MATCH_CONTENT);
        text.setText("My name is Text.");
        text.setTextSize(50);

设置Text

<Text
    ...
    ohos:background_element="$graphic:background_text"/>

常用的背景如常见的文本背景、按钮背景,可以采用XML格式放置在graphic目录下。

在Project窗口,打开“entry > src > main > resources > base”,右键点击“graphic”文件夹,选择“New > File”,命名为“background_text.xml”,在background_text.xml中定义文本的背景

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:shape="rectangle">
    <corners
        ohos:radius="20"/>
    <solid
        ohos:color="#878787"/>
</shape>

以上代码的效果

image.png

设置字体大小和颜色

<Text
    ohos:id="$+id:text"
    ohos:width="match_content"
    ohos:height="match_content"
    ohos:text="Text"
    ohos:text_size="28fp"
    ohos:text_color="#0000FF"
    ohos:left_margin="15vp"
    ohos:bottom_margin="15vp"
    ohos:right_padding="15vp"
    ohos:left_padding="15vp"
    ohos:background_element="$graphic:background_text"/>

设置字体风格和字重

<Text
    ohos:id="$+id:text"
    ohos:width="match_content"
    ohos:height="match_content"
    ohos:text="Text"
    ohos:text_size="28fp"
    ohos:text_color="#0000FF"
    ohos:italic="true"
    ohos:text_weight="700"
    ohos:text_font="serif"
    ohos:left_margin="15vp"
    ohos:bottom_margin="15vp"
    ohos:right_padding="15vp"
    ohos:left_padding="15vp"
    ohos:background_element="$graphic:background_text"/>

设置文本对齐方式

<Text
    ohos:id="$+id:text"
    ohos:width="300vp"
    ohos:height="100vp"
    ohos:text="Text"
    ohos:text_size="28fp"
    ohos:text_color="#0000FF"
    ohos:italic="true"
    ohos:text_weight="700"
    ohos:text_font="serif"
    ohos:left_margin="15vp"
    ohos:bottom_margin="15vp"
    ohos:right_padding="15vp"
    ohos:left_padding="15vp"
    ohos:text_alignment="horizontal_center|bottom"
    ohos:background_element="$graphic:background_text"/>

设置文本换行和最大显示行数

<Text
    ohos:id="$+id:text"
    ohos:width="75vp"
    ohos:height="match_content"
    ohos:text="TextText"
    ohos:text_size="28fp"
    ohos:text_color="#0000FF"
    ohos:italic="true"
    ohos:text_weight="700"
    ohos:text_font="serif"
    ohos:multiple_lines="true"
    ohos:max_text_lines="2"
    ohos:background_element="$graphic:background_text"/>

自动调节字体大小

Text对象支持根据文本长度自动调整文本的字体大小和换行。

<Text
    ohos:id="$+id:text"
    ohos:width="90vp"
    ohos:height="match_content"
    ohos:min_height="30vp"
    ohos:text="T"
    ohos:text_color="#0000FF"
    ohos:italic="true"
    ohos:text_weight="700"
    ohos:text_font="serif"
    ohos:multiple_lines="true"
    ohos:max_text_lines="1"
    ohos:auto_font_size="true"
    ohos:right_padding="8vp"
    ohos:left_padding="8vp"
    ohos:background_element="$graphic:background_text"/>
Text text = (Text) findComponentById(ResourceTable.Id_text);
// 设置自动调整规则
text.setAutoFontSizeRule(30, 100, 1);
// 设置点击一次增多一个"T"
text.setClickedListener(new Component.ClickedListener() {
    @Override
    public void onClick(Component component) {
        text.setText(text.getText() + "T");
    }
});

跑马灯效果

当文本过长时,可以设置跑马灯效果,实现文本滚动显示。前提是文本换行关闭且最大显示行数为1,默认情况下即可满足前提要求。

<Text
    ohos:id="$+id:text"
    ohos:width="75vp"
    ohos:height="match_content"
    ohos:text="TextText"
    ohos:text_size="28fp"
    ohos:text_color="#0000FF"
    ohos:italic="true"
    ohos:text_weight="700"
    ohos:text_font="serif"
    ohos:background_element="$graphic:background_text"/>
// 跑马灯效果
text.setTruncationMode(Text.TruncationMode.AUTO_SCROLLING);
// 始终处于自动滚动状态
text.setAutoScrollingCount(Text.AUTO_SCROLLING_FOREVER);
// 启动跑马灯效果
text.startAutoScrolling();
<?xml version="1.0" encoding="utf-8"?>
<DependentLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:width="match_parent"
    ohos:height="match_content"
    ohos:background_element="$graphic:color_light_gray_element">
    <Text
        ohos:id="$+id:text1"
        ohos:width="match_parent"
        ohos:height="match_content"
        ohos:text_size="25fp"
        ohos:top_margin="15vp"
        ohos:left_margin="15vp"
        ohos:right_margin="15vp"
        ohos:background_element="$graphic:background_text"
        ohos:text="Title"
        ohos:text_weight="1000"
        ohos:text_alignment="horizontal_center"/>
    <Text
        ohos:id="$+id:text2"
        ohos:width="match_parent"
        ohos:height="120vp"
        ohos:text_size="25fp"
        ohos:background_element="$graphic:background_text"
        ohos:text="Content"
        ohos:top_margin="15vp"
        ohos:left_margin="15vp"
        ohos:right_margin="15vp"
        ohos:bottom_margin="15vp"
        ohos:text_alignment="center"
        ohos:below="$id:text1"
        ohos:text_font="serif"/>
    <Button
        ohos:id="$+id:button1"
        ohos:width="75vp"
        ohos:height="match_content"
        ohos:text_size="15fp"
        ohos:background_element="$graphic:background_text"
        ohos:text="Previous"
        ohos:right_margin="15vp"
        ohos:bottom_margin="15vp"
        ohos:left_padding="5vp"
        ohos:right_padding="5vp"
        ohos:below="$id:text2"
        ohos:left_of="$id:button2"
        ohos:text_font="serif"/>
    <Button
        ohos:id="$+id:button2"
        ohos:width="75vp"
        ohos:height="match_content"
        ohos:text_size="15fp"
        ohos:background_element="$graphic:background_text"
        ohos:text="Next"
        ohos:right_margin="15vp"
        ohos:bottom_margin="15vp"
        ohos:left_padding="5vp"
        ohos:right_padding="5vp"
        ohos:align_parent_end="true"
        ohos:below="$id:text2"
        ohos:text_font="serif"/>
</DependentLayout>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:shape="rectangle">
    <solid
        ohos:color="#EDEDED"/>
</shape>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:shape="rectangle">
    <corners
        ohos:radius="20"/>
    <solid
        ohos:color="#878787"/>
</shape>
上一篇下一篇

猜你喜欢

热点阅读