Vertical scrolling while dragging the event

[HaneenAhmedMohy]

using the dateController.animateToPage is smooth in scrolling horizontally while dragging the event but using the timeController.animateTo to scroll vertically has a slow and weird behavior while dragging ... any help, please ?

[JonasWanke]

Can you please add some code to demonstrate the problem you're facing and, preferably, a video/GIF of the behavior?

[HaneenAhmedMohy]

We are using LongPressDraggable to drag and drop the event

Positioned(
      top: _top
      left: _left
      child: LongPressDraggable(
        onDragUpdate: _onDragUpdate,
        childWhenDragging: Opacity(opacity: 0.75, child: _buildPicker()),
        feedback: Container(),
        child: _buildPicker(),
      ),
    );

and onDrag update we are calling this function

void _onDragUpdate(DragUpdateDetails details) {
    setState(() {
      _left += details.delta.dx;
      _top+=details.delta.dy
    });
    _moveCanvasVertically();
    _maybeMoveCanvasHorizontally();
  }

and here are the vertical and horizontal dragging methods

void _maybeMoveCanvasHorizontally() async {
    final page = widget.dateController.value.page;
    final daysCount = widget.dateController.visibleRange.visibleDayCount;
    final quarterOfWidth = widget.width / 4;
    if (_animating) return;
    if (_left >= widget.width * (daysCount - 1) + quarterOfWidth) {
      _animating = true;
      await widget.dateController.animateToPage(
        page + daysCount,
        vsync: this,
        duration: const Duration(milliseconds: 400),
      );
      _animating = false;
    } else if (_left < 0 - quarterOfWidth) {
      _animating = true;
      await widget.dateController.animateToPage(
        page - daysCount,
        vsync: this,
        duration: const Duration(milliseconds: 400),
      );
      _animating = false;
    }
  }
Future<void> _moveCanvasVertically() async {
    _animating = true;
    await widget.timeController.animateTo(
      TimeRange.centeredAround(
        _selectedStartDate.durationSinceStartOfDay,
        widget.timeController.value.duration,
      ),
      vsync: this,
      duration: const Duration(milliseconds: 400),
    );
    _animating = false;
  }

[HaneenAhmedMohy]

Screen_Recording_20220807-231718.mp4