featurecommon/zoomview/ZoomView.ets

/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Dispatch, getStore, OhCombinedState } from '../../redux/store';
import { Action } from '../../redux/actions/Action';
import { EventBus } from '../../worker/eventbus/EventBus';
import { EventBusManager } from '../../worker/eventbus/EventBusManager';
import { CameraId } from '../../setting/settingitem/CameraId';

let SHOW_FOLD_CANVAS: number = 0
let SHOW_NOT_TAKE_VIDEO_CANVAS: number = 1
let SHOW_TAKING_VIDEO_CANVAS: number = 2

class StateStruct {
  mode: string = 'PHOTO';
  videoState: string = 'beforeTakeVideo';
  cameraPosition: CameraId = CameraId.BACK;
  zoomRatio: number = 1;
  isShowZoomText: boolean = false;
  showZoomLabelValue: boolean = true;
  minZoomRatio: number = 1;
  maxZoomRatio: number = 6;
}

class ZoomViewDispatcher {
  public setDispatch(dispatch: Dispatch) {
    this.mDispatch = dispatch;
  }

  public updateZoomRatio(zoomRatio: number): void {
    this.mDispatch(Action.changeZoomRatio(zoomRatio));
  }

  public updateShowZoomFlag(flag: boolean): void {
    this.mDispatch(Action.updateShowZoomTextFlag(flag));
  }

  public updateShowZoomLabelValue(flag: boolean): void {
    this.mDispatch(Action.updateShowZoomLabelValue(flag));
  }

  private mDispatch: Dispatch = (data) => data;
}

class ZoomRatioStruct {
  zoomRatio: number = 0;
}

class VideoStateStruct {
  videoState: string = '';
}

@Component
export struct ZoomView {
  @State state: StateStruct = new StateStruct();
  @State offsetX: number = 0
  @State triggerRebuildNum: number = 0
  private appEventBus: EventBus = EventBusManager.getInstance().getEventBus()
  private mAction: ZoomViewDispatcher = new ZoomViewDispatcher();
  private notTakeVideoExtCanvasWidth: number = 360
  private takingVideoExtCanvasWidth: number = 196
  private foldCanvasWidth: number = 94
  private canvasHeight: number = 82
  private touchedOffsetX: number = this.takingVideoExtCanvasWidth / 2
  private startOffsetX: number = 0
  private canvasSettings: RenderingContextSettings = new RenderingContextSettings(true)
  private notTakeVideoExtCanvasCtx: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.canvasSettings)
  private takingVideoExtCanvasCtx: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.canvasSettings)
  private foldCanvasCtx: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.canvasSettings)
  private notTakeVideoExtOffCanvasCtx: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(
    this.notTakeVideoExtCanvasWidth, this.canvasHeight, this.canvasSettings)
  private takingVideoExtOffCanvasCxt: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(
    this.takingVideoExtCanvasWidth, this.canvasHeight, this.canvasSettings)
  private foldOffCanvasCtx: OffscreenCanvasRenderingContext2D = new OffscreenCanvasRenderingContext2D(
    this.foldCanvasWidth, this.canvasHeight, this.canvasSettings)
  private lpgTimer: number = 0
  private pgTimer: number = 0
  private lpgExp: boolean = false
  private pgExp: boolean = false
  private baseZoomRatio: number = 1
  private mainDotRadius: number = 1.5
  private secDotRadius: number = 0.75
  private centerDotRadius: number = 2.5
  private dotSpacing: number = 4

  aboutToAppear(): void {
    getStore().subscribe((state: OhCombinedState) => {
      this.state = {
        mode: state.modeReducer.mode,
        videoState: state.recordReducer.videoState,
        cameraPosition: state.cameraReducer.cameraPosition,
        zoomRatio: state.zoomReducer.zoomRatio,
        isShowZoomText: state.zoomReducer.isShowZoomText,
        showZoomLabelValue: state.zoomReducer.showZoomLabelValue,
        minZoomRatio: state.zoomReducer.minZoomRatio,
        maxZoomRatio: state.zoomReducer.maxZoomRatio
      };
    }, (dispatch: Dispatch) => {
      this.mAction.setDispatch(dispatch);
    });
    this.appEventBus.on(Action.ACTION_CHANGE_ZOOM_RATIO, (data: ZoomRatioStruct) => this.updateZoomOffset(data))
    this.appEventBus.on(Action.ACTION_UPDATE_VIDEO_STATE, (data: VideoStateStruct) => this.updateZoomState(data))
  }

  aboutToDisappear(): void {
    this.appEventBus.off(Action.ACTION_CHANGE_ZOOM_RATIO, (data: ZoomRatioStruct) => this.updateZoomOffset(data))
    this.appEventBus.off(Action.ACTION_UPDATE_VIDEO_STATE, (data: VideoStateStruct) => this.updateZoomState(data))
  }

  build() {
    Stack({ alignContent: Alignment.Top }) {
      Stack({ alignContent: Alignment.Top })
        .width(this.offsetX + this.touchedOffsetX + this.state.zoomRatio)
        .height(this.triggerRebuildNum)
        .visibility(Visibility.None)
      if (this.getCurrentCanvasType() === SHOW_NOT_TAKE_VIDEO_CANVAS) {
        Canvas(this.notTakeVideoExtCanvasCtx)
          .width(this.notTakeVideoExtCanvasWidth)
          .height(this.canvasHeight)
          .onReady(() => {
            this.notTakeVideoExtCanvasCtx.clearRect(0, 0, this.notTakeVideoExtCanvasWidth, this.canvasHeight)
            this.notTakeVideoExtOffCanvasCtx.clearRect(0, 0, this.notTakeVideoExtCanvasWidth, this.canvasHeight)
            this.notTakeVideoExtOffCanvasCtx.strokeStyle = '#ffffff'
            this.notTakeVideoExtOffCanvasCtx.fillStyle = '#ffffff'
            this.notTakeVideoExtOffCanvasCtx.lineWidth = 1.5
            this.notTakeVideoExtOffCanvasCtx.beginPath()
            this.notTakeVideoExtOffCanvasCtx.arc(this.getZoomBtnCenterX(), this.canvasHeight / 2,
              this.getZoomBtnRadius(), 0, 6.28)
            this.notTakeVideoExtOffCanvasCtx.stroke()
            if (this.state.showZoomLabelValue) {
              this.notTakeVideoExtOffCanvasCtx.font = `bold ${vp2px(11)}px`
              this.notTakeVideoExtOffCanvasCtx.textAlign = 'center'
              this.notTakeVideoExtOffCanvasCtx.fillText(this.getZoomText(), this.getZoomBtnCenterX(),
                this.canvasHeight / 2 + 5)
            } else {
              this.notTakeVideoExtOffCanvasCtx.beginPath()
              this.notTakeVideoExtOffCanvasCtx.arc(this.getZoomBtnCenterX(), this.canvasHeight / 2,
                this.centerDotRadius, 0, 6.28)
              this.notTakeVideoExtOffCanvasCtx.fill()
            }

            let spotCount =
              (this.notTakeVideoExtCanvasWidth - this.getPadding() * 2 - this.mainDotRadius * 4 - this.dotSpacing) /
                (this.dotSpacing + this.secDotRadius * 2) + 2
            for (let i = 0; i < spotCount; i++) {
              let spotCenter = 0
              let spotRadius = 0
              if (i === 0) {
                spotRadius = this.mainDotRadius
                spotCenter = this.getPadding() + spotRadius
                this.notTakeVideoExtOffCanvasCtx.font = `bold ${vp2px(11)}px`
                this.notTakeVideoExtOffCanvasCtx.textAlign = 'center'
                this.notTakeVideoExtOffCanvasCtx.fillText(`${this.state.minZoomRatio}x`, spotCenter,
                  this.canvasHeight / 2 - (!this.state.showZoomLabelValue ? 26 : 24))
              } else if (i === spotCount - 1) {
                spotRadius = this.mainDotRadius
                spotCenter = this.notTakeVideoExtCanvasWidth - this.getPadding() - spotRadius
                this.notTakeVideoExtOffCanvasCtx.font = `bold ${vp2px(11)}px`
                this.notTakeVideoExtOffCanvasCtx.textAlign = 'center'
                this.notTakeVideoExtOffCanvasCtx.fillText(`${this.state.maxZoomRatio}x`, spotCenter,
                  this.canvasHeight / 2 - (!this.state.showZoomLabelValue ? 26 : 24))
              } else {
                spotRadius = this.secDotRadius
                spotCenter =
                  this.getPadding() + this.mainDotRadius + (2 * i - 1) * this.secDotRadius + i * this.dotSpacing
                this.notTakeVideoExtOffCanvasCtx.globalAlpha = 0.2
              }
              if (spotCenter < this.getZoomBtnCenterX() - this.getZoomBtnRadius() ||
                spotCenter > this.getZoomBtnCenterX() + this.getZoomBtnRadius()) {
                this.notTakeVideoExtOffCanvasCtx.beginPath()
                this.notTakeVideoExtOffCanvasCtx.arc(spotCenter, this.canvasHeight / 2, spotRadius, 0, 6.28)
                this.notTakeVideoExtOffCanvasCtx.fill()
              }
              this.notTakeVideoExtOffCanvasCtx.globalAlpha = 1
            }
            this.notTakeVideoExtCanvasCtx.transferFromImageBitmap(this.notTakeVideoExtOffCanvasCtx.transferToImageBitmap())
          })
          .gesture(GestureGroup(GestureMode.Parallel,
            PanGesture({ fingers: 1, distance: 1, direction: PanDirection.Horizontal })
              .onActionStart(() => this.pgOnActionStart())
              .onActionUpdate((event?: GestureEvent) => {
                if (event) {
                  return this.pgOnActionUpdate(event);
                }
              })
              .onActionEnd(() => this.pgOnActionEnd())))
          .onTouch((event?: TouchEvent) => {
            if (event) {
              return this.mOnTouch(event);
            }
          })
      } else if (this.getCurrentCanvasType() === SHOW_TAKING_VIDEO_CANVAS) {
        Row() {
          Image($r('app.media.ic_camera_public_focus_ev_bright_subtract'))
            .width(24)
            .height(24)
            .fillColor(Color.White)
            .onTouch((event?: TouchEvent) => this.subtractTouched(event))
            .gesture(
              GestureGroup(
                GestureMode.Parallel,
                LongPressGesture({ repeat: true })
                  .onAction((event?: GestureEvent) => this.subtractLongOnAction(event))
                  .onActionEnd(() => this.subtractLongOnActionEnd()),
              )
            )
          Canvas(this.takingVideoExtCanvasCtx)
            .width(this.takingVideoExtCanvasWidth)
            .height(this.canvasHeight)
            .onReady(() => {
              this.takingVideoExtCanvasCtx.clearRect(0, 0, this.takingVideoExtCanvasWidth, this.canvasHeight)
              this.takingVideoExtOffCanvasCxt.clearRect(0, 0, this.takingVideoExtCanvasWidth, this.canvasHeight)
              this.takingVideoExtOffCanvasCxt.strokeStyle = '#ffffff'
              this.takingVideoExtOffCanvasCxt.fillStyle = '#ffffff'
              this.takingVideoExtOffCanvasCxt.lineWidth = 1.5
              this.takingVideoExtOffCanvasCxt.beginPath()
              this.takingVideoExtOffCanvasCxt.arc(this.getZoomBtnCenterX(), this.canvasHeight / 2,
                this.getZoomBtnRadius(), 0, 6.28)
              this.takingVideoExtOffCanvasCxt.stroke()
              if (this.state.isShowZoomText) {
                this.takingVideoExtOffCanvasCxt.beginPath()
                this.takingVideoExtOffCanvasCxt.arc(this.getZoomBtnCenterX(), this.canvasHeight / 2,
                  this.centerDotRadius, 0, 6.28)
                this.takingVideoExtOffCanvasCxt.fill()
              } else {
                this.takingVideoExtOffCanvasCxt.font = `bold ${vp2px(11)}px`
                this.takingVideoExtOffCanvasCxt.textAlign = 'center'
                this.takingVideoExtOffCanvasCxt.fillText(this.getZoomText(), this.getZoomBtnCenterX(),
                  this.canvasHeight / 2 + 5)
              }

              let spotCount = 30
              for (let i = 0; i < spotCount; i++) {
                let spotCenter = 0
                let spotRadius = 0
                spotRadius = this.secDotRadius
                spotCenter = this.getPadding() + (2 * i + 1) * this.secDotRadius + i * this.dotSpacing
                this.takingVideoExtOffCanvasCxt.globalAlpha = 0.2
                if (spotCenter < this.getZoomBtnCenterX() - this.getZoomBtnRadius() ||
                  spotCenter > this.getZoomBtnCenterX() + this.getZoomBtnRadius()) {
                  this.takingVideoExtOffCanvasCxt.beginPath()
                  this.takingVideoExtOffCanvasCxt.arc(spotCenter, this.canvasHeight / 2, spotRadius, 0, 6.28)
                  this.takingVideoExtOffCanvasCxt.fill()
                }
                this.takingVideoExtOffCanvasCxt.globalAlpha = 1
              }

              this.takingVideoExtCanvasCtx.transferFromImageBitmap(this.takingVideoExtOffCanvasCxt.transferToImageBitmap())
            })
            .gesture(
              GestureGroup(
                GestureMode.Parallel,
                LongPressGesture({ repeat: true })
                  .onAction((event?: GestureEvent) => this.takingVideoExtLongPgAction(event))
                  .onActionEnd(() => this.takingVideoExtLongPgActionEnd()),
                PanGesture({ fingers: 1, distance: 1, direction: PanDirection.Horizontal })
                  .onActionStart((event?: GestureEvent) => this.takingVideoExtPgActionStart(event))
                  .onActionUpdate((event?: GestureEvent) => this.takingVideoExtPgActionUpdate(event))
                  .onActionEnd((event?: GestureEvent) => this.takingVideoExtPgActionEnd(event))
              ))
            .onTouch((event?: TouchEvent) => this.takingVideoExtTouched(event))
          Image($r('app.media.ic_camera_public_focus_ev_bright_add'))
            .width(24)
            .height(24)
            .fillColor(Color.White)
            .onTouch((event?: TouchEvent) => this.addTouched(event))
            .gesture(
              GestureGroup(
                GestureMode.Parallel,
                LongPressGesture({ repeat: true })
                  .onAction(() => this.addLongOnAction())
                  .onActionEnd(() => this.addLongOnActionEnd()),
              )
            )
        }.width(this.notTakeVideoExtCanvasWidth).height('100%').padding({ left: 58, right: 58 })
      } else {
        Canvas(this.foldCanvasCtx)
          .width(this.foldCanvasWidth)
          .height(this.canvasHeight)
          .onReady(() => {
            this.foldCanvasCtx.clearRect(0, 0, this.foldCanvasWidth, this.canvasHeight)
            this.foldOffCanvasCtx.clearRect(0, 0, this.foldCanvasWidth, this.canvasHeight)
            this.foldOffCanvasCtx.strokeStyle = '#ffffff'
            this.foldOffCanvasCtx.fillStyle = '#ffffff'
            this.foldOffCanvasCtx.lineWidth = 1.5
            this.foldOffCanvasCtx.beginPath()
            this.foldOffCanvasCtx.arc(this.foldCanvasWidth / 2, this.canvasHeight / 2, this.getZoomBtnRadius(), 0, 6.28)
            this.foldOffCanvasCtx.stroke()
            this.foldOffCanvasCtx.font = `bold ${vp2px(10)}px`
            this.foldOffCanvasCtx.textAlign = 'center'
            this.foldOffCanvasCtx.fillText(this.getZoomText(), this.foldCanvasWidth / 2, this.canvasHeight / 2 + 3)

            let fullWidth = this.foldCanvasWidth / 2 - this.mainDotRadius
            let spotCount =
              (fullWidth - this.mainDotRadius * 2 - this.dotSpacing) / (this.dotSpacing + this.secDotRadius * 2) + 2
            let spotOffset = this.state.zoomRatio === this.state.maxZoomRatio ? this.foldCanvasWidth / 2 - fullWidth
              : this.foldCanvasWidth / 2
            for (let i = 0; i < spotCount; i++) {
              let spotCenter = 0
              let spotRadius = 0
              if (i === 0) {
                spotRadius = this.mainDotRadius
                spotCenter = spotOffset + spotRadius
              } else if (i === spotCount - 1) {
                spotRadius = this.mainDotRadius
                spotCenter =
                  spotOffset + this.mainDotRadius * 2 + (i - 1) * this.dotSpacing + (2 * i - 1) * this.secDotRadius -
                  this.secDotRadius + spotRadius
              } else {
                spotRadius = this.secDotRadius
                spotCenter =
                  spotOffset + this.mainDotRadius * 2 + (i - 1) * this.dotSpacing + (2 * i - 1) * this.secDotRadius +
                    spotRadius
                this.foldOffCanvasCtx.globalAlpha = 0.2
              }
              if (spotCenter < this.foldCanvasWidth / 2 - this.getZoomBtnRadius() ||
                spotCenter > this.foldCanvasWidth / 2 + this.getZoomBtnRadius()) {
                this.foldOffCanvasCtx.beginPath()
                this.foldOffCanvasCtx.arc(spotCenter, this.canvasHeight / 2, spotRadius, 0, 6.28)
                this.foldOffCanvasCtx.fill()
              }
              this.foldOffCanvasCtx.globalAlpha = 1.0
            }

            this.foldCanvasCtx.transferFromImageBitmap(this.foldOffCanvasCtx.transferToImageBitmap())
          })
          .gesture(
            GestureGroup(
              GestureMode.Parallel,
              LongPressGesture({ repeat: true })
                .onAction(() => this.lpgOnAction())
                .onActionEnd(() => this.lpgOnActionEnd()),
              PanGesture({ fingers: 1, distance: 1, direction: PanDirection.Horizontal })
                .onActionStart(() => this.pgOnActionStart())
                .onActionUpdate((event?: GestureEvent) => this.pgOnActionUpdate(event))
                .onActionEnd(() => this.pgOnActionEnd())
            )
          )
      }
    }.width('100%').height(this.canvasHeight).margin({ bottom: !this.state.showZoomLabelValue ? 58 : 0 })
  }

  private getCurrentCanvasType(): number {
    if (this.state.isShowZoomText && (this.state.videoState === 'beforeTakeVideo'
      && (this.state.mode === 'PHOTO' || this.state.mode === 'VIDEO'))) {
      return SHOW_NOT_TAKE_VIDEO_CANVAS
    } else if (this.state.mode === 'VIDEO'
      && (this.state.isShowZoomText || this.state.videoState !== 'beforeTakeVideo')) {
      return SHOW_TAKING_VIDEO_CANVAS
    } else {
      return SHOW_FOLD_CANVAS
    }
  }

  private lpgOnAction(): void {
    this.clearTimer()
    this.mAction.updateShowZoomFlag(true)
    this.baseZoomRatio = this.state.zoomRatio
    this.offsetX = (this.state.zoomRatio - 1) * this.getZoomOffsetUnit()
    this.lpgExp = true
    this.pgExp = false
    this.triggerRebuildNum = this.triggerRebuildNum + 0.0001
  }

  private lpgOnActionEnd(): void {
    if (this.lpgTimer) {
      clearTimeout(this.lpgTimer)
    }
    this.lpgTimer = setTimeout(() => {
      if (this.lpgExp && !this.pgExp) {
        this.mAction.updateShowZoomFlag(false)
        this.triggerRebuildNum = this.triggerRebuildNum + 0.0001
      }
      this.lpgExp = false
    }, 3000)
  }

  private changeZoomRatioOnTakingVideoExt(): void {
    if (this.touchedOffsetX > this.takingVideoExtCanvasWidth / 2) {
      this.addZoomRatio()
    } else if (this.touchedOffsetX < this.takingVideoExtCanvasWidth / 2) {
      this.subtractZoomRatio()
    } else {
      this.triggerRebuildNum = this.triggerRebuildNum + 0.0001
      this.mAction.updateShowZoomFlag(false)
    }
  }

  private addZoomRatio(): void {
    let curZoomRatio = this.state.zoomRatio + 0.1
    if (curZoomRatio > this.state.maxZoomRatio) {
      curZoomRatio = this.state.maxZoomRatio
    }
    this.mAction.updateZoomRatio(curZoomRatio)
    this.mAction.updateShowZoomFlag(true)
    this.triggerRebuildNum = this.triggerRebuildNum + 0.0001
  }

  private subtractZoomRatio(): void {
    let curZoomRatio = this.state.zoomRatio - 0.1
    if (curZoomRatio < this.state.minZoomRatio) {
      curZoomRatio = this.state.minZoomRatio
    }
    this.mAction.updateZoomRatio(curZoomRatio)
    this.mAction.updateShowZoomFlag(true)
    this.triggerRebuildNum = this.triggerRebuildNum - 0.0001
  }

  private takingVideoExtTouched(event?: TouchEvent): void {
    if (!event) {
      return;
    }
    if (event.type === TouchType.Down) {
      this.touchedOffsetX = event.touches[0].x
      this.startOffsetX = event.touches[0].x
      this.changeZoomRatioOnTakingVideoExt()
    }
    if (event.type === TouchType.Up) {
      this.touchedOffsetX = this.takingVideoExtCanvasWidth / 2
      this.changeZoomRatioOnTakingVideoExt()
    }
  }

  private takingVideoExtLongPgAction(event?: GestureEvent): void {
    if (!event) {
      return;
    }
    this.touchedOffsetX = event.fingerList[0].localX
    this.changeZoomRatioOnTakingVideoExt()
  }

  private takingVideoExtLongPgActionEnd(): void {
    this.touchedOffsetX = this.takingVideoExtCanvasWidth / 2
    this.changeZoomRatioOnTakingVideoExt()
  }

  private takingVideoExtPgActionStart(event?: GestureEvent): void {
    if (!event) {
      return;
    }
    this.touchedOffsetX = this.startOffsetX + event.offsetX
    this.changeZoomRatioOnTakingVideoExt()
  }

  private takingVideoExtPgActionUpdate(event?: GestureEvent): void {
    if (!event) {
      return;
    }
    this.touchedOffsetX = this.startOffsetX + event.offsetX
    let takingVideoExtMaxOffsetX = this.takingVideoExtCanvasWidth - this.getZoomBtnRadius() - this.secDotRadius
    let takingVideoExtMinOffsetX = this.getZoomBtnRadius() + this.secDotRadius
    if (this.touchedOffsetX > takingVideoExtMaxOffsetX) {
      this.touchedOffsetX = takingVideoExtMaxOffsetX
    } else if (this.touchedOffsetX < takingVideoExtMinOffsetX) {
      this.touchedOffsetX = takingVideoExtMinOffsetX
    }
    this.changeZoomRatioOnTakingVideoExt()
  }

  private takingVideoExtPgActionEnd(event?: GestureEvent): void {
    if (!event) {
      return;
    }
    this.touchedOffsetX = this.takingVideoExtCanvasWidth / 2
    this.startOffsetX = 0
    this.changeZoomRatioOnTakingVideoExt()
  }

  private subtractTouched(event?: TouchEvent): void {
    if (!event) {
      return;
    }
    if (event.type === TouchType.Down) {
      this.subtractZoomRatio()
    }
    if (event.type === TouchType.Up) {
      this.mAction.updateShowZoomFlag(false)
    }
  }

  private subtractLongOnAction(event?: GestureEvent): void {
    if (!event) {
      return;
    }
    this.subtractZoomRatio()
  }

  private subtractLongOnActionEnd(): void {
    this.mAction.updateShowZoomFlag(false)
  }

  private addTouched(event?: TouchEvent): void {
    if (!event) {
      return;
    }
    if (event.type === TouchType.Down) {
      this.addZoomRatio()
    }
    if (event.type === TouchType.Up) {
      this.mAction.updateShowZoomFlag(false)
    }
  }

  private addLongOnAction(): void {
    this.addZoomRatio()
  }

  private addLongOnActionEnd(): void {
    this.mAction.updateShowZoomFlag(false)
  }

  private pgOnActionStart(): void {
    this.clearTimer()
    this.mAction.updateShowZoomFlag(true)
    this.mAction.updateShowZoomLabelValue(false)
    this.baseZoomRatio = this.state.zoomRatio
    this.pgExp = true
    this.lpgExp = false
  }

  private pgOnActionUpdate(event?: GestureEvent): void {
    if (!event) {
      return;
    }
    this.offsetX = (this.baseZoomRatio - this.state.minZoomRatio) * this.getZoomOffsetUnit() + event.offsetX
    this.updateZoomRatio()
  }

  private pgOnActionEnd(): void {
    this.mAction.updateShowZoomLabelValue(true)
    if (this.pgTimer) {
      clearTimeout(this.pgTimer)
    }
    this.pgTimer = setTimeout(() => {
      if (this.pgExp && !this.lpgExp) {
        this.mAction.updateShowZoomFlag(false)
      }
      this.pgExp = false
    }, 3000)
  }

  private mOnTouch(event: TouchEvent): void {
    if (event.type === TouchType.Down) {
      this.clearTimer()
      this.mAction.updateShowZoomFlag(true)
      this.pgExp = true
      this.lpgExp = false

      let x = event.touches[0].x
      let zoomRatio = this.state.zoomRatio
      if (this.state.videoState === 'beforeTakeVideo' && this.getCurrentCanvasType() === SHOW_NOT_TAKE_VIDEO_CANVAS) {
        if (x < vp2px(36)) {
          zoomRatio = this.state.minZoomRatio
        }
        if (x > this.notTakeVideoExtCanvasWidth - vp2px(36)) {
          zoomRatio = this.state.maxZoomRatio
        }
        if (x > vp2px(36) && x < this.notTakeVideoExtCanvasWidth - vp2px(36)) {
          this.offsetX = x - this.getPadding()
          this.updateZoomRatio()
          return;
        }
      }
      this.offsetX = (zoomRatio - 1) * this.getZoomOffsetUnit()
      this.updateZoomRatio()
    } else if (event.type === TouchType.Up) {
      if (this.pgTimer) {
        clearTimeout(this.pgTimer)
      }
      this.pgTimer = setTimeout(() => {
        if (this.pgExp && !this.lpgExp) {
          this.mAction.updateShowZoomFlag(false)
        }
        this.pgExp = false
      }, 3000)
    }

  }

  private getZoomBtnCenterX(): number {
    if (this.getCurrentCanvasType() === SHOW_TAKING_VIDEO_CANVAS) {
      return this.touchedOffsetX
    }
    if (this.offsetX === 0 && this.state.zoomRatio !== 1) {
      this.offsetX = (this.state.zoomRatio - this.state.minZoomRatio) * this.getZoomOffsetUnit()
    }
    if (this.state.zoomRatio === 1 && this.offsetX !== 0) {
      this.offsetX = 0
    }
    let padding = this.getPadding()
    let result = this.offsetX + padding + this.mainDotRadius
    if (result > this.notTakeVideoExtCanvasWidth - padding - this.mainDotRadius) {
      result = this.notTakeVideoExtCanvasWidth - padding - this.mainDotRadius
    }
    if (result < padding + this.mainDotRadius) {
      result = padding + this.mainDotRadius
    }
    return result
  }

  private getZoomOffsetUnit(): number {
    let padding = this.getPadding();
    let fullWidth = this.notTakeVideoExtCanvasWidth - padding * 2 - this.mainDotRadius * 2;
    return fullWidth / (this.state.maxZoomRatio - this.state.minZoomRatio);
  }

  private updateZoomOffset(data: ZoomRatioStruct): void {
    let offset = (data.zoomRatio - this.state.minZoomRatio) * this.getZoomOffsetUnit();
    this.offsetX = offset;
  }

  private updateZoomState(data: VideoStateStruct): void {
    if (data.videoState === 'beforeTakeVideo') {
      this.clearTimer();
      this.mAction.updateShowZoomFlag(false);
      this.pgExp = false;
    }
  }

  private clearTimer(): void {
    if (this.pgTimer) {
      clearTimeout(this.pgTimer);
    }
    if (this.lpgTimer) {
      clearTimeout(this.lpgTimer);
    }
  }

  private updateZoomRatio(): void {
    let padding = this.getPadding()
    let fullWidth = this.notTakeVideoExtCanvasWidth - padding * 2 - this.mainDotRadius * 2
    let curZoomRatio =
      (this.offsetX / fullWidth) * (this.state.maxZoomRatio - this.state.minZoomRatio) + this.state.minZoomRatio
    if (curZoomRatio > this.state.maxZoomRatio) {
      curZoomRatio = this.state.maxZoomRatio
    }
    if (curZoomRatio < this.state.minZoomRatio) {
      curZoomRatio = this.state.minZoomRatio
    }
    this.mAction.updateZoomRatio(curZoomRatio)
  }

  private getPadding(): number {
    if (this.getCurrentCanvasType() === SHOW_NOT_TAKE_VIDEO_CANVAS) {
      return 32
    } else if (this.getCurrentCanvasType() === SHOW_TAKING_VIDEO_CANVAS) {
      return 15.5
    } else {
      return 32
    }
  }

  private getZoomText() {
    return `${Number(this.state.zoomRatio.toFixed(1))}x`
  }

  private getZoomBtnRadius(): number {
    if (!this.state.showZoomLabelValue) {
      return 17.25
    } else {
      return 15.25
    }
  }
}