updateData method

dynamic updateData(SlideUpdate event)

updating data using SlideUpdate, generally we are handling and managing the Animation UpdateType in this methods, All callbacks and factors are also managed by this method.

Implementation

updateData(SlideUpdate event) {
  if (!enableLoop) if (event.direction == SlideDirection.leftToRight &&
      activePageIndex == 0) {
    return;
  } else if (event.direction == SlideDirection.rightToLeft &&
      activePageIndex == pagesLength - 1) {
    return;
  }

  if (prevUpdate != event.updateType && _currentUpdateTypeCallback != null)
    _currentUpdateTypeCallback!(event.updateType);

  if (_slidePercentCallback != null &&
      event.updateType != UpdateType.doneAnimating) {
    String hor = (event.slidePercentHor * 100).toStringAsExponential(2);
    String ver = (event.slidePercentVer * 100).toStringAsExponential(2);
    _slidePercentCallback!(
        double.parse(hor), (((double.parse(ver)) * 100) / 100));
  }

  prevUpdate = event.updateType;

  //if the user is dragging then
  if (event.updateType == UpdateType.dragging) {
    slideDirection = event.direction;
    slidePercentHor = event.slidePercentHor;
    slidePercentVer = event.slidePercentVer;

    // making pages to be in loop
    nextPageIndex = activePageIndex;
    if (enableLoop) {
      //conditions on slide direction
      if (slideDirection == SlideDirection.leftToRight) {
        nextPageIndex = activePageIndex - 1;
      } else if (slideDirection == SlideDirection.rightToLeft) {
        nextPageIndex = activePageIndex + 1;
      }

      if (nextPageIndex > pagesLength - 1) {
        nextPageIndex = 0;
      } else if (nextPageIndex < 0) {
        nextPageIndex = pagesLength - 1;
      }
      return;
    }

    //conditions on slide direction
    if (slideDirection == SlideDirection.leftToRight &&
        activePageIndex != 0) {
      nextPageIndex = activePageIndex - 1;
    } else if (slideDirection == SlideDirection.rightToLeft &&
        activePageIndex != pagesLength - 1) {
      nextPageIndex = activePageIndex + 1;
    }
    return;
  }
  //if the user has done dragging
  else if (event.updateType == UpdateType.doneDragging) {
    // slidepercent > 0.2 so that it wont reveal itself unless this condition is true
    if (slidePercentHor > 0.2) {
      isAnimating = true; // Page started to animate

      animatedPageDragger = AnimatedPageDragger(
        slideUpdateStream: this,
        slideDirection: slideDirection,
        transitionGoal: TransitionGoal.open,
        slidePercentHor: slidePercentHor,
        slidePercentVer: slidePercentVer,
        vsync: singleTickerProviderStateMixin,
      );
    } else {
      animatedPageDragger = AnimatedPageDragger(
        slideUpdateStream: this,
        slideDirection: slideDirection,
        transitionGoal: TransitionGoal.close,
        slidePercentHor: slidePercentHor,
        slidePercentVer: slidePercentVer,
        vsync: singleTickerProviderStateMixin,
      );

      nextPageIndex = activePageIndex;
    }
    //Run the animation
    animatedPageDragger.run();
    return;
  }
  //when animating
  else if (event.updateType == UpdateType.animating) {
    slideDirection = event.direction;
    slidePercentHor = event.slidePercentHor;
    slidePercentVer = event.slidePercentVer;
    return;
  }

  //done animating
  if (_onPageChangeCallback != null) {
    _onPageChangeCallback!(nextPageIndex);
  }
  activePageIndex = nextPageIndex;
  slideDirection = SlideDirection.rightToLeft;
  slidePercentHor = 0.00;
  slidePercentVer = positionSlideIcon;
  nextPageIndex = activePageIndex;

  if (enableLoop) {
    //conditions on slide direction
    if (slideDirection == SlideDirection.leftToRight) {
      nextPageIndex = activePageIndex - 1;
    } else if (slideDirection == SlideDirection.rightToLeft) {
      nextPageIndex = activePageIndex + 1;
    }

    if (nextPageIndex > pagesLength - 1) {
      nextPageIndex = 0;
    } else if (nextPageIndex < 0) {
      nextPageIndex = pagesLength - 1;
    }
  } else {
    if (slideDirection == SlideDirection.leftToRight &&
        activePageIndex != 0) {
      nextPageIndex = activePageIndex - 1;
    } else if (slideDirection == SlideDirection.rightToLeft &&
        activePageIndex != pagesLength - 1) {
      nextPageIndex = activePageIndex + 1;
    }
  }

  isAnimating = false; // Page stopped animating
  return;
}