@TOC

前言

在我们的ArkTS中有一些通用的事件，他们在所有的组件中都可以用，所以我们需要来学习一下。
获得更好的开发体验和效率！！！

一、点击事件

1.1 基础介绍

组件被点击时触发的事件。

1.2 ClickEvent对象说明

1.3 示例代码

// xxx.ets
@Entry
@Component
struct ClickExample {
  @State text: string = ''

  build() {
    Column() {
      Row({ space: 20 }) {
        Button('Click').width(100).height(40)
          .onClick((event: ClickEvent) => {
            this.text = 'Click Point:' + '\n  screenX:' + event.screenX + '\n  screenY:' + event.screenY
            + '\n  x:' + event.x + '\n  y:' + event.y + '\ntarget:' + '\n  component globalPos:('
            + event.target.area.globalPosition.x + ',' + event.target.area.globalPosition.y + ')\n  width:'
            + event.target.area.width + '\n  height:' + event.target.area.height + '\ntimestamp' + event.timestamp;
          })
        Button('Click').width(200).height(50)
          .onClick((event: ClickEvent) => {
            this.text = 'Click Point:' + '\n  screenX:' + event.screenX + '\n  screenY:' + event.screenY
            + '\n  x:' + event.x + '\n  y:' + event.y + '\ntarget:' + '\n  component globalPos:('
            + event.target.area.globalPosition.x + ',' + event.target.area.globalPosition.y + ')\n  width:'
            + event.target.area.width + '\n  height:' + event.target.area.height + '\ntimestamp' + event.timestamp;
          })
      }.margin(20)

      Text(this.text).margin(15)
    }.width('100%')
  }
}

二、触摸事件

2.1 基础介绍

组件被点击时触发的事件。

2.2 ClickEvent对象说明

2.3 示例代码

// xxx.ets
@Entry
@Component
struct TouchExample {
  @State text: string = ''
  @State eventType: string = ''

  build() {
    Column() {
      Button('Touch').height(40).width(100)
        .onTouch((event: TouchEvent) => {
          if (event.type === TouchType.Down) {
            this.eventType = 'Down'
          }
          if (event.type === TouchType.Up) {
            this.eventType = 'Up'
          }
          if (event.type === TouchType.Move) {
            this.eventType = 'Move'
          }
          this.text = 'TouchType:' + this.eventType + '\nDistance between touch point and touch element:\nx: '
          + event.touches[0].x + '\n' + 'y: ' + event.touches[0].y + '\nComponent globalPos:('
          + event.target.area.globalPosition.x + ',' + event.target.area.globalPosition.y + ')\nwidth:'
          + event.target.area.width + '\nheight:' + event.target.area.height
        })
      Button('Touch').height(50).width(200).margin(20)
        .onTouch((event: TouchEvent) => {
          if (event.type === TouchType.Down) {
            this.eventType = 'Down'
          }
          if (event.type === TouchType.Up) {
            this.eventType = 'Up'
          }
          if (event.type === TouchType.Move) {
            this.eventType = 'Move'
          }
          this.text = 'TouchType:' + this.eventType + '\nDistance between touch point and touch element:\nx: '
          + event.touches[0].x + '\n' + 'y: ' + event.touches[0].y + '\nComponent globalPos:('
          + event.target.area.globalPosition.x + ',' + event.target.area.globalPosition.y + ')\nwidth:'
          + event.target.area.width + '\nheight:' + event.target.area.height
        })
      Text(this.text)
    }.width('100%').padding(30)
  }
}

二、焦点事件

2.2 基础介绍

焦点事件指页面焦点在可获焦组件间移动时触发的事件，组件可使用焦点事件来处理相关逻辑。

3.2 示例代码

// xxx.ets
@Entry
@Component
struct FocusEventExample {
  @State oneButtonColor: string = '#FFC0CB'
  @State twoButtonColor: string = '#87CEFA'
  @State threeButtonColor: string = '#90EE90'

  build() {
    Column({ space: 20 }) {
      // 通过外接键盘的上下键可以让焦点在三个按钮间移动，按钮获焦时颜色变化，失焦时变回原背景色
      Button('First Button')
        .backgroundColor(this.oneButtonColor)
        .width(260)
        .height(70)
        .fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.oneButtonColor = '#FF0000'
        })
        .onBlur(() => {
          this.oneButtonColor = '#FFC0CB'
        })
      Button('Second Button')
        .backgroundColor(this.twoButtonColor)
        .width(260)
        .height(70)
        .fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.twoButtonColor = '#FF0000'
        })
        .onBlur(() => {
          this.twoButtonColor = '#87CEFA'
        })
      Button('Third Button')
        .backgroundColor(this.threeButtonColor)
        .width(260)
        .height(70)
        .fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.threeButtonColor = '#FF0000'
        })
        .onBlur(() => {
          this.threeButtonColor = '#90EE90'
        })
    }.width('100%').margin({ top: 20 })
  }
}

总结

以上就是今天要讲的内容，本文仅仅简单介绍了点击、触摸、焦点事件，而ArkTS还提供了其他函数，有兴趣地可以自行去看官方文档