Make a scrollView autoscroll with drag and drop in Android

Question

I searched all over, but could not find a solution.

I have a view (lets call it myView) inside a scrollview. myView is bigger than the screen. Since I\'m able to get

Answer 1

I used a timer in In C#

ScrollCalendar ScrollCalendar = new ScrollCalendar (yourScrollView);

Inside the drag event

    public bool OnDrag (View v, DragEvent e)
    {
        var dragshadow = new EventDateDragShadow (v);
        switch (e.Action) {
        case DragAction.Started:
            return true;
        case DragAction.Entered:
            break;
        case Android.Views.DragAction.Location:

            if (e.GetY () < 90) {
                ScrollCalendar.StartScroll (-15);
            } else if (e.GetY () > yourScrollView.Height - 90) {
                ScrollCalendar.StartScroll (15);
            } else
                ScrollCalendar.StopScroll ();

            return (true);
        case DragAction.Exited:
            return true;
        case DragAction.Drop:
            return true;
        case DragAction.Ended:
            ScrollCalendar.StopScroll ();
            v.SetOnDragListener (null);
            return true;
        }

        return true;
    }

The ScrollCalendar class

public class ScrollCalendar
{
    private ScrollView Calendar;
    private System.Timers.Timer Timer;
    private int ScrollDistance;

    public ScrollCalendar(ScrollView calendar)
    {
        Calendar = calendar;
        Timer = new System.Timers.Timer();
        Timer.Elapsed+=new ElapsedEventHandler(Scroll);
        Timer.Interval = 50;
    }

    public void StartScroll(int scrollDistance)
    {
        if (Timer.Enabled) {
            return;
        }
        ScrollDistance = scrollDistance;
        Timer.Enabled = true;
    }

    public void StopScroll()
    {
        Timer.Enabled = false;
    }

    private void Scroll(object source, ElapsedEventArgs e)
    {
        Calendar.SmoothScrollBy (0, ScrollDistance);
    }

}

Change the StartScroll value and the Timer.Interval to adjust the speed of the scroll.