harmony 鸿蒙@ohos.animator (Animator)

  • 2022-08-09
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@ohos.animator (Animator)

The Animator module provides APIs for applying animation effects, including defining animations, starting animations, and playing animations in reverse order.

NOTE

The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.

This module can be used in ArkTS since API version 9.

This module cannot be used in the file declaration of the UIAbility. In other words, the APIs of this module can be used only after a component instance is created; they cannot be called in the lifecycle of the UIAbility.

The functionality of this module depends on UI context. This means that the APIs of this module cannot be used where the UI context is unclear. For details, see UIContext.

Since API version 10, you can use the createAnimator API in UIContext to obtain the UI context.

Modules to Import

import animator, { AnimatorOptions,AnimatorResult } from '@ohos.animator';

create9+

create(options: AnimatorOptions): AnimatorResult

Creates an Animator object.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
options AnimatorOptions Yes Animator options.

Return value

Type Description
AnimatorResult Animator result.

Example

import animator, { AnimatorOptions,AnimatorResult } from '@ohos.animator';
let options: AnimatorOptions = {
  duration: 1500,
  easing: "friction",
  delay: 0,
  fill: "forwards",
  direction: "normal",
  iterations: 3,
  begin: 200.0,
  end: 400.0
};
animator.create(options);

AnimatorResult

Defines the animator result.

reset9+

reset(options: AnimatorOptions): void

Updates this animator.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
options AnimatorOptions Yes Animator options.

Error codes

For details about the error codes, see Animator Error Codes.

ID Error Message
100001 if no page is found for pageId or fail to get object property list.

Example

import animator, { AnimatorOptions,AnimatorResult } from '@ohos.animator';
import { BusinessError } from '@ohos.base';
let options: AnimatorOptions = {
  duration: 1500,
  easing: "friction",
  delay: 0,
  fill: "forwards",
  direction: "normal",
  iterations: 3,
  begin: 200.0,
  end: 400.0
};
try {
  animator.reset(options);
} catch(error) {
  let message = (error as BusinessError).message
  let code = (error as BusinessError).code
  console.error(`Animator reset failed, error code: ${code}, message: ${message}.`);
}

play

play(): void

Plays this animation. The animation retains the previous playback state. For example, if the animation is set to reverse and paused, it will remain in reverse when resumed.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

animator.play();

finish

finish(): void

Ends this animation.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

animator.finish();

pause

pause(): void

Pauses this animation.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

animator.pause();

cancel

cancel(): void

Cancels this animation.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

animator.cancel();

reverse

reverse(): void

Plays this animation in reverse order.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

animator.reverse();

onframe

onframe: (progress: number) => void

Called when a frame is received.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
progress number Yes Current progress of the animation.

Example

import animator, { AnimatorResult } from '@ohos.animator';
let animatorResult:AnimatorResult|undefined = animator.create(options)
animatorResult.onframe = (value)=> {
  console.info("onframe callback")
}

onfinish

onfinish: () => void

Called when this animation is finished.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

import animator, { AnimatorResult } from '@ohos.animator';
let animatorResult:AnimatorResult|undefined = animator.create(options)
animatorResult.onfinish = ()=> {
  console.info("onfinish callback")
}

oncancel

oncancel: () => void

Called when this animation is canceled.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

import animator, { AnimatorResult } from '@ohos.animator';
let animatorResult:AnimatorResult|undefined = animator.create(options)
animatorResult.oncancel = ()=> {
  console.info("oncancel callback")
}

onrepeat

onrepeat: () => void

Called when this animation repeats.

System capability: SystemCapability.ArkUI.ArkUI.Full

Example

import animator, { AnimatorResult } from '@ohos.animator';
let animatorResult:AnimatorResult|undefined = animator.create(options)
animatorResult.onrepeat = ()=> {
  console.info("onrepeat callback")
}

AnimatorOptions

Defines animator options.

System capability: SystemCapability.ArkUI.ArkUI.Full

Name Type Mandatory Description
duration number Yes Duration for playing the animation, in milliseconds.
easing string Yes Animation interpolation curve. Only the following values are supported:
“linear”: The animation speed keeps unchanged.
“ease”: The animation starts slowly, accelerates, and then slows down towards the end. The cubic-bezier curve (0.25, 0.1, 0.25, 1.0) is used.
“ease-in”: The animation starts at a low speed and then picks up speed until the end. The cubic-bezier curve (0.42, 0.0, 1.0, 1.0) is used.
“ease-out”: The animation ends at a low speed. The cubic-bezier curve (0.0, 0.0, 0.58, 1.0) is used.
“ease-in-out”: The animation starts and ends at a low speed. The cubic-bezier curve (0.42, 0.0, 0.58, 1.0) is used.
“fast-out-slow-in”: The animation uses the standard cubic-bezier curve (0.4, 0.0, 0.2, 1.0).
“linear-out-slow-in”: The animation uses the deceleration cubic-bezier curve (0.0, 0.0, 0.2, 1.0).
“friction”: The animation uses the damping cubic-bezier curve (0.2, 0.0, 0.2, 1.0).
“extreme-deceleration”: The animation uses the extreme deceleration cubic-bezier curve (0.0, 0.0, 0.0, 1.0).
“rhythm”: The animation uses the rhythm cubic-bezier curve (0.7, 0.0, 0.2, 1.0).
“sharp”: The animation uses the sharp cubic-bezier curve (0.33, 0.0, 0.67, 1.0).
“smooth”: The animation uses the smooth cubic-bezier curve (0.4, 0.0, 0.4, 1.0).
“cubic-bezier(x1,y1,x2,y2)”: The animation uses the defined cubic bezier curve, where the value of x1 and x2 must range from 0 to 1. For example, “cubic-bezier(0.42,0.0,0.58,1.0)”.
“steps(number,step-position)”: The animation uses a step curve. The number parameter is mandatory and must be set to a positive integer. The step-position parameter is optional and can be set to start or end (default value). For example, “steps(3,start)”.
delay number Yes Animation delay duration, in milliseconds. Value 0 means that there is no delay.
fill “none” |“forwards” |“backwards” |“both” Yes State of the animated target after the animation is executed.
“none”: No style is applied to the target before or after the animation is executed.
“forwards”: The target keeps the state at the end of the animation (defined in the last key frame) after the animation is executed.
“backwards”: The animation uses the value defined in the first key frame during the animation-delay. When animation-direction is set to normal or alternate, the value in the from key frame is used. When animation-direction is set to reverse or alternate-reverse, the value in the to key frame is used.
“both”: The animation follows the forwards and backwards rules.
direction “normal” |“reverse” |“alternate” |“alternate-reverse” Yes Animation playback mode.
“normal”: plays the animation in forward loop mode.
“reverse”: plays the animation in reverse loop mode.
“alternate”: plays the animation in alternating loop mode. When the animation is played for an odd number of times, the playback is in forward direction. When the animation is played for an even number of times, the playback is in reverse direction.
“alternate-reverse”: plays the animation in reverse alternating loop mode. When the animation is played for an odd number of times, the playback is in reverse direction. When the animation is played for an even number of times, the playback is in forward direction.
iterations number Yes Number of times that the animation is played. The value 0 means not to play the animation, and -1 means to play the animation for an unlimited number of times.
NOTE
If this parameter is set to a negative value other than -1, the value is invalid. In this case, the animation is played once.
begin number Yes Start point of the animation interpolation.
end number Yes End point of animation interpolation.

Example

JavaScript-compatible Web-like Development Paradigm

<!-- hml -->
<div class="container">
  <div class="Animation" style="height: {{divHeight}}px; width: {{divWidth}}px; background-color: red;" onclick="Show">
  </div>
</div>

import animator, { AnimatorOptions,AnimatorResult } from '@ohos.animator';
import { BusinessError } from '@ohos.base';
let DataTmp:Record<string,animator> = {
  'divWidth': 200,
  'divHeight': 200,
  'animator': animator
}
class Tmp{
  data:animator = DataTmp
  onInit:Function = ()=>{}
  Show:Function = ()=>{}
}
class DateT{
  divWidth:number = 0
  divHeight:number = 0
  animator:AnimatorResult|null = null
}
(Fn:(v:Tmp) => void) => {Fn({
  data: DataTmp,
  onInit() {
    let options:AnimatorOptions = {
      duration: 1500,
      easing: "friction",
      delay: 0,
      fill: "forwards",
      direction: "normal",
      iterations: 2,
      begin: 200.0,
      end: 400.0
    };
    let DataTmp:DateT = {
      divWidth: 200,
      divHeight: 200,
      animator: null
    }
    DataTmp.animator = animator.create(options);
  },
  Show() {
    let options1:AnimatorOptions = {
      duration: 1500,
      easing: "friction",
      delay: 0,
      fill: "forwards",
      direction: "normal",
      iterations: 2,
      begin: 0,
      end: 400.0,
    };
    let DataTmp:DateT = {
      divWidth: 200,
      divHeight: 200,
      animator: null
    }
    try {
      DataTmp.animator = animator.create(options1);
      DataTmp.animator.reset(options1);
    } catch(error) {
      let message = (error as BusinessError).message
      let code = (error as BusinessError).code
      console.error(`Animator reset failed, error code: ${code}, message: ${message}.`);
    }
    let _this = DataTmp;
    if(DataTmp.animator){
      DataTmp.animator.onframe = (value:number)=> {
        _this.divWidth = value;
        _this.divHeight = value;
      };
      DataTmp.animator.play();
    }
  }
})}

en-us_image_00007

ArkTS-based Declarative Development Paradigm

import animator, { AnimatorResult } from '@ohos.animator';

@Entry
@Component
struct AnimatorTest {
  private TAG: string = '[AnimatorTest]'
  private backAnimator: AnimatorResult|undefined = undefined
  private flag: boolean = false
  @State wid: number = 100
  @State hei: number = 100

  create() {
    let _this = this
    this.backAnimator = animator.create({
      duration: 2000,
      easing: "ease",
      delay: 0,
      fill: "forwards",
      direction: "normal",
      iterations: 1,
      begin: 100,
      end: 200
    })
    this.backAnimator.onfinish = ()=> {
      _this.flag = true
      console.info(_this.TAG, 'backAnimator onfinish')
    }
    this.backAnimator.onrepeat = ()=> {
      console.info(_this.TAG, 'backAnimator repeat')
    }
    this.backAnimator.oncancel = ()=> {
      console.info(_this.TAG, 'backAnimator cancel')
    }
    this.backAnimator.onframe = (value:number)=> {
      _this.wid = value
      _this.hei = value
    }
  }

  aboutToDisappear() {
    // Because backAnimator references this in onframe, backAnimator is saved in this.
    // When the custom component disappears, leave backAnimator empty to avoid memory leak.
    this.backAnimator = undefined;
  }

  build() {
    Column() {
      Column() {
        Column()
          .width(this.wid)
          .height(this.hei)
          .backgroundColor(Color.Red)
      }
      .width('100%')
      .height(300)

      Column() {
        Row() {
          Button('create')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              this.create()
            })
        }
        .padding(10)

        Row() {
          Button('play')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              this.flag = false
              if(this.backAnimator){
                this.backAnimator.play()
              }
            })
        }
        .padding(10)

        Row() {
          Button('pause')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              if(this.backAnimator){
                this.backAnimator.pause()
              }
            })
        }
        .padding(10)

        Row() {
          Button('finish')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              this.flag = true
              if(this.backAnimator){
                this.backAnimator.finish()
              }
            })
        }
        .padding(10)

        Row() {
          Button('reverse')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              this.flag = false
              if(this.backAnimator){
                this.backAnimator.reverse()
              }
            })
        }
        .padding(10)

        Row() {
          Button('cancel')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              if(this.backAnimator){
                this.backAnimator.cancel()
              }
            })
        }
        .padding(10)

        Row() {
          Button('reset')
            .fontSize(30)
            .fontColor(Color.Black)
            .onClick(() => {
              if (this.flag) {
                this.flag = false
                if(this.backAnimator){
                  this.backAnimator.reset({
                    duration: 3000,
                    easing: "ease-in",
                    delay: 0,
                    fill: "forwards",
                    direction: "alternate",
                    iterations: 3,
                    begin: 100,
                    end: 300
                  })
                }
              } else {
                console.info(this.TAG, 'Animation not ended')
              }
            })
        }
        .padding(10)
      }
    }
  }
}

update(deprecated)

update(options: AnimatorOptions): void

Updates this animator.

This API is deprecated since API version 9. You are advised to use reset9+ instead.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
options AnimatorOptions Yes Animator options.

Example

animator.update(options);

createAnimator(deprecated)

createAnimator(options: AnimatorOptions): AnimatorResult

Creates an Animator object.

This API is deprecated since API version 9. You are advised to use create9+ instead.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
options AnimatorOptions Yes Animator options.

Return value

Type Description
AnimatorResult Animator result.

Example

import animator, { AnimatorOptions,AnimatorResult } from '@ohos.animator';
let options: AnimatorOptions = { // The explicit type AnimatorOptions does not need to be emphasized in the xxx.js file.
  duration: 1500,
  easing: "friction",
  delay: 0,
  fill: "forwards",
  direction: "normal",
  iterations: 3,
  begin: 200.0,
  end: 400.0,
};
this.animator = animator.createAnimator(options);

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