harmony 鸿蒙Defining Gesture Events

2022-08-09
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Defining Gesture Events

A gesture represents a semantic action (for example, tap, drag, or longpress) that can trigger one or more events. A gesture lifecycle may consist of multiple events from the start to the end of the gesture. Supported events are as follows:

Touch

touchstart: Triggered when the touch starts.
touchmove: Triggered when the touch moves.
touchcancel: Triggered when the touch is interrupted, for example, by an incoming call notification or pop-up message.
touchend: Triggered when the touch ends.

Click

click: Triggered when a user taps the screen quickly.

Longpress

longpress: Triggered when a user keeps tapping the screen at the same position for a while.

The following is an example:

<!-- xxx.hml -->
<div class="container">
  <div class="text-container" onclick="click">
    <text class="text-style">{{onClick}}</text>
  </div>
  <div class="text-container" ontouchstart="touchStart">
    <text class="text-style">{{touchstart}}</text>
  </div>
  <div class="text-container" ontouchmove="touchMove">
    <text class="text-style">{{touchmove}}</text>
  </div>
  <div class="text-container" ontouchend="touchEnd">
    <text class="text-style">{{touchend}}</text>
  </div>
  <div class="text-container" ontouchcancel="touchCancel">
    <text class="text-style">{{touchcancel}}</text>
  </div>
  <div class="text-container" onlongpress="longPress">
    <text class="text-style">{{onLongPress}}</text>
  </div>
</div>

/* xxx.css */
.container {
  width: 100%;
  height: 100%;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.text-container {
  margin-top: 30px;
  flex-direction: column;
  width: 600px;
  height: 70px;
  background-color: #0000FF;
}
.text-style {
  width: 100%;
  line-height: 50px;
  text-align: center;
  font-size: 24px;
  color: #ffffff;
}

// xxx.js
export default {
  data: {
    touchstart: 'touchstart',
    touchmove: 'touchmove',
    touchend: 'touchend',
    touchcancel: 'touchcancel',
    onClick: 'onclick',
    onLongPress: 'onlongpress',
  },
  touchCancel: function (event) {
    this.touchcancel = 'canceled';
  },
  touchEnd: function(event) {
    this.touchend = 'ended';
  },
  touchMove: function(event) {
    this.touchmove = 'moved';
  }, 
  touchStart: function(event) {
    this.touchstart = 'touched';
  },
  longPress: function() {
    this.onLongPress = 'longpressed';
  },
  click: function() {
    this.onClick = 'clicked';
  },
}

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