private void Lw_Scroll(object sender, AbsListView.ScrollEventArgs e)
{
var ddd = e.View.GetChildAt(0);
if (lw.FirstVisiblePosition == 0)
{
rrr = ddd.Top;
}
CustomListview.OnScrollChanged(Source, new Controls.Actions.ScrollChangedEventArgs(0, 0, 0, rrr));
}
private void TvDelegate_OnScrolled(object sender, EventArgs e)
{
if (Control.ContentOffset.Y < 0)
{
CustomListview.OverScrollUpdate(Source, (float)(-Control.ContentOffset.Y / Xamarin.Essentials.DeviceDisplay.MainDisplayInfo.Density));
}
else
{
CustomListview.OnScrollChanged(Source, new CustomForms.ScrollChangedEventArgs(0, 0, 0, (int)(-Control.ContentOffset.Y * Xamarin.Essentials.DeviceDisplay.MainDisplayInfo.Density)));
}
}
private bool DisposeDataSource()
{
if (DataSource != null && this._isDisposing == false)
{
DataSource.OnSwipe -= OnSwipe;
DataSource.OnScrollEvent -= OnScrollEvent;
DataSource.Dispose();
DataSource = null;
this.Control.Source = null;
return(true);
}
return(false);
}
private void Lw_ScrollStateChanged(object sender, AbsListView.ScrollStateChangedEventArgs e)
{
var currentScrollState = Controls.Actions.ScrollStateChangedEventArgs.ScrollState.Idle;
if (e.ScrollState == Android.Widget.ScrollState.Idle)
{
currentScrollState = Controls.Actions.ScrollStateChangedEventArgs.ScrollState.Idle;
}
else
{
currentScrollState = Controls.Actions.ScrollStateChangedEventArgs.ScrollState.Running;
}
CustomListview.OnScrollStateChanged(Source, new Controls.Actions.ScrollStateChangedEventArgs(currentScrollState));
}
protected override void OnElementChanged(ElementChangedEventArgs <ListView> e)
{
base.OnElementChanged(e);
var customListview = Element as CustomListview;
if (customListview == null)
{
return;
}
if (this.Control != null && this._isDisposing == false && this.Element != null)
{
this.Control.MultipleTouchEnabled = true;
DataSource = new WrapperSource(Control.Source, Control, 55);
DataSource._LastYPosition = 0;
//DataSource._RemoveListViewInset = Source.RemoveInset;
Control.Source = DataSource;
DataSource.OnSwipe += OnSwipe;
DataSource.OnScrollEvent += OnScrollEvent;
}
if (Control != null)
{
var tvDelegate = new TableViewDelegate();
Control.Delegate = tvDelegate;
tvDelegate.OnScrolled += TvDelegate_OnScrolled;
tvDelegate.OnDecelerationStarted += (s, ev) =>
{
CustomListview.OnScrollStateChanged(customListview,
new ScrollStateChangedEventArgs(ScrollStateChangedEventArgs.ScrollState.Running));
};
tvDelegate.OnDecelerationEnded += (s, ev) =>
{
CustomListview.OnScrollStateChanged(customListview,
new ScrollStateChangedEventArgs(ScrollStateChangedEventArgs.ScrollState.Idle));
};
tvDelegate.OnRowSelected += (s, ev) =>
{
var index = s as NSIndexPath;
CustomListview.OnItemTappedIOS(customListview, new ItemTappedIOSEventArgs(index.Row));
};
}
}
public void OnOverScrollUpdate(IOverScrollDecor decor, int state, float offset)
{
CustomListview.OverScrollUpdate(Source, offset / Context.Resources.DisplayMetrics.Density);
}
