RotationGesture
RotationGesture is used to trigger a rotation gesture, which requires two to five fingers with a minimum 1-degree rotation angle.
NOTE
This gesture is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.
APIs
RotationGesture(value?: { fingers?: number, angle?: number })
Parameters
| Name | Type | Mandatory | Description |
|---|---|---|---|
| fingers | number | No | Minimum number of fingers to trigger a rotation. The value ranges from 2 to 5. Default value: 2 |
| angle | number | No | Minimum degree that can trigger the rotation gesture. Default value: 1 NOTE If the value is less than or equal to 0 or greater than 360, it will be converted to the default value. |
Events
| Parameter | Description |
|---|---|
| onActionStart(event:(event?: GestureEvent) => void) | Triggered when a rotation gesture is recognized. |
| onActionUpdate(event:(event?: GestureEvent) => void) | Triggered when the user moves the finger in a rotation gesture on the screen. |
| onActionEnd(event:(event?: GestureEvent) => void) | Triggered when the finger used for the rotation gesture is lift. |
| onActionCancel(event: () => void) | Triggered when a tap cancellation event is received after the rotation gesture is recognized. NOTE This event is triggered when the window loses focus. |
Example
// xxx.ets
@Entry
@Component
struct RotationGestureExample {
@State angle: number = 0
@State rotateValue: number = 0
build() {
Column() {
Column() {
Text('RotationGesture angle:' + this.angle)
}
.height(200)
.width(300)
.padding(20)
.border({ width: 3 })
.margin(80)
.rotate({ angle: this.angle })
// The gesture event is triggered by rotating with two fingers.
.gesture(
RotationGesture()
.onActionStart((event?: GestureEvent) => {
console.info('Rotation start')
})
.onActionUpdate((event?: GestureEvent) => {
if (event) {
this.angle = this.rotateValue + event.angle
}
})
.onActionEnd(() => {
this.rotateValue = this.angle
console.info('Rotation end')
})
)
}.width('100%')
}
}
