harmony 鸿蒙marquee

2022-08-09
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marquee

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version. Since API version 6, the text scrolls only when its width exceeds the width of the <marquee> component.

The <marquee> component is used to display a scrolling piece of text.

Required Permissions

None

Child Components

Not supported

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Default Value	Mandatory	Description
scrollamount	number	6	No	Maximum length of each scroll.
loop	number	-1	No	Number of rolling times. If this parameter is not set, the default value -1 is used. When the value is less than or equal to 0, the marquee scrolls continuously.
direction	string	left	No	Direction in which the marquee scrolls, which can be left or right.

Styles

In addition to the universal styles, the following styles are supported.

Name	Type	Default Value	Mandatory	Description
color	<color>	#e5000000	No	Font color of the scrolling text.
font-size	<length>	37.5	No	Font size of the scrolling text.
allow-scale	boolean	true	No	Whether the font size changes with the system’s font size settings. If the config-changes tag of fontSize is configured for abilities in the config.json file, the setting takes effect without application restart.
font-weight	number \|string	normal	No	Font weight of the scrolling text. For details, see font-weight of the <text> component.
font-family	string	sans-serif	No	Font family, in which fonts are separated by commas (,). Each font is set using a font name or font family name. The first font in the family or the specified custom font is used for the text.

Events

In addition to the universal events, the following events are supported.

Name	Parameter	Description
bounce	-	Triggered when the marquee scrolls to the end.
finish	-	Triggered when the marquee finishes the specified number of scrollings (value of the loop attribute). It can be triggered only when the loop attribute is set to a number greater than 0.
start	-	Triggered when the marquee starts to scroll.

Methods

In addition to the universal methods, the following methods are supported.

Name	Parameter	Description
start	-	Starts scrolling.
stop	-	Stops scrolling.

Example

<!-- xxx.hml -->
<div class="tutorial-page">
  <div class="mymarquee">
    <marquee  style="color: {{color1}}" loop="{{loopval}}" scrollamount="{{scroll}}" direction="{{isleft}}" class="marqueetext" 
    id="testmarquee" onfinish="setfinish">
      Life is a journey, not the destination.
    </marquee>
  </div>
  <div style="width: 600px;height: 150px;flex-direction: row;justify-content: space-around;">
    <button onclick="makestart"  value="start"></button>
    <button onclick="makestop" value="stop"></button>
  </div>
</div>

/* xxx.css */
.tutorial-page {
  width: 750px;
  height: 100%;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.marqueetext {
  font-size: 37px;
}
.mymarquee {
  margin-top: 20px;
  width:100%;
  height: 100px;
  margin-left: 50px;
  margin-right: 50px;
  border: 1px solid #dc0f27;
  border-radius: 15px;
  align-items: center;
}
button{
  width: 200px;
  height: 80px;
  margin-top: 100px;
}

// xxx.js
export default {
  private: {
    loopval: 1,
    scroll: 8,
    color1: 'red'
  },
  onInit(){
  },
  setfinish(e) {
    this.loopval=  this.loopval + 1,
    this.r = Math.floor(Math.random()*255),
    this.g = Math.floor(Math.random()*255),
    this.b = Math.floor(Math.random()*255),
    this.color1 = 'rgba('+ this.r +','+ this.g +','+ this.b +',0.8)',
    this.$element('testmarquee').start(),
    this.loopval=  this.loopval - 1
  },
  makestart(e) {
    this.$element('testmarquee').start()
  },
  makestop(e) {
    this.$element('testmarquee').stop()
  }
}

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