harmony 鸿蒙ImageAnimator

2022-08-09
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ImageAnimator

The <ImageAnimator> component enables images to be played frame by frame. The list of images to be played as well as the duration of each image can be configured.

NOTE

This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

APIs

ImageAnimator()

Since API version 10, this API is supported in ArkTS widgets.

Attributes

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

Name	Type	Description
images	Array<ImageFrameInfo>	Image frame information. The information of each frame includes the image path, image size, image position, and image playback duration. For details, see ImageFrameInfo. Default value: [] NOTE Dynamic update is not supported. Since API version 10, this API is supported in ArkTS widgets.
state	AnimationStatus	Playback status of the animation. The default status is Initial. Default value: AnimationStatus.Initial Since API version 10, this API is supported in ArkTS widgets.
duration	number	Playback duration, in ms. The default duration is 1000 ms. When the duration is 0, no image is played. The value change takes effect only at the beginning of the next cycle. When a separate duration is set in images, the setting of this attribute is invalid. Default value: 1000 Since API version 10, this API is supported in ArkTS widgets.
reverse	boolean	Playback direction. The value false indicates that images are played from the first one to the last one, and true indicates that images are played from the last one to the first one. Default value: false Since API version 10, this API is supported in ArkTS widgets.
fixedSize	boolean	Whether the image size is the same as the component size. true: The image size is the same as the component size. In this case, the width, height, top, and left attributes of the image are invalid. false: The width, height, top, and left attributes of each image must be set separately. Default value: true Since API version 10, this API is supported in ArkTS widgets.
preDecode^(deprecated)	number	Number of pre-decoded images. The value 2 indicates that two images following the currently playing page will be pre-decoded to improve performance. This API is deprecated since API version 9. Default value: 0
fillMode	FillMode	Status before and after execution of the animation in the current playback direction. For details about the options, see FillMode. The status after execution of the animation is jointly determined by the fillMode and reverse attributes. For example, if fillMode is set to Forwards, the target will retain the state defined by the last keyframe encountered during execution. In this case, if reverse is set to false, the target will retain the state defined by the last keyframe encountered in the forward direction, that is, the last image; if reverse is set to true, the target will retain the state defined by the last keyframe encountered in the backward direction, that is, the first image. Default value: FillMode.Forwards Since API version 10, this API is supported in ArkTS widgets.
iterations	number	Number of times that the animation is played. By default, the animation is played once. The value -1 indicates that the animation is played for an unlimited number of times. Default value: 1

ImageFrameInfo

Name	Type	Mandatory	Description
src	string \|Resource⁹⁺	Yes	Image path. The image format can be .svg, .png, or .jpg. Since API version 9, this attribute accepts paths of the Resource type. Since API version 10, this API is supported in ArkTS widgets.
width	number \|string	No	Image width. Default value: 0 Since API version 10, this API is supported in ArkTS widgets.
height	number \|string	No	Image height. Default value: 0 Since API version 10, this API is supported in ArkTS widgets.
top	number \|string	No	Vertical coordinate of the image relative to the upper left corner of the widget Default value: 0 Since API version 10, this API is supported in ArkTS widgets.
left	number \|string	No	Horizontal coordinate of the image relative to the upper left corner of the widget Default value: 0 Since API version 10, this API is supported in ArkTS widgets.
duration	number	No	Playback duration of each image frame, in milliseconds. Default value: 0

Events

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

Name	Description
onStart(event: () => void)	Triggered when the animation starts to play. Since API version 10, this API is supported in ArkTS widgets.
onPause(event: () => void)	Triggered when the animation playback is paused. Since API version 10, this API is supported in ArkTS widgets.
onRepeat(event: () => void)	Triggered when the animation playback is repeated.
onCancel(event: () => void)	Triggered when the animation playback is canceled. Since API version 10, this API is supported in ArkTS widgets.
onFinish(event: () => void)	Triggered when the animation playback is complete. Since API version 10, this API is supported in ArkTS widgets.

Example

// xxx.ets
@Entry
@Component
struct ImageAnimatorExample {
  @State state: AnimationStatus = AnimationStatus.Initial
  @State reverse: boolean = false
  @State iterations: number = 1

  build() {
    Column({ space: 10 }) {
      ImageAnimator()
        .images([
          {
            src: $r('app.media.img1')
          },
          {
            src: $r('app.media.img2')
          },
          {
            src: $r('app.media.img3')
          },
          {
            src: $r('app.media.img4')
          }
        ])
        .duration(2000)
        .state(this.state).reverse(this.reverse)
        .fillMode(FillMode.None).iterations(this.iterations).width(340).height(240)
        .margin({ top: 100 })
        .onStart(() => {
          console.info('Start')
        })
        .onPause(() => {
          console.info('Pause')
        })
        .onRepeat(() => {
          console.info('Repeat')
        })
        .onCancel(() => {
          console.info('Cancel')
        })
        .onFinish(() => {
          console.info('Finish')
          this.state = AnimationStatus.Stopped
        })
      Row() {
        Button('start').width(100).padding(5).onClick(() => {
          this.state = AnimationStatus.Running
        }).margin(5)
        Button('pause').width(100).padding(5).onClick(() => {
          this.state = AnimationStatus.Paused     // Display the image of the current frame.
        }).margin(5)
        Button('stop').width(100).padding(5).onClick(() => {
          this.state = AnimationStatus.Stopped    // Display the image of the initial frame.
        }).margin(5)
      }

      Row() {
        Button('reverse').width(100).padding(5).onClick(() => {
          this.reverse = !this.reverse
        }).margin(5)
        Button('once').width(100).padding(5).onClick(() => {
          this.iterations = 1
        }).margin(5)
        Button('infinite').width(100).padding(5).onClick(() => {
          this.iterations = -1 // The animation is played for an unlimited number of times.
        }).margin(5)
      }
    }.width('100%').height('100%')
  }
}

imageAnimator