static int CalculateCenterItemIndex(int firstVisibleItemIndex, RecyclerView recyclerView, LinearLayoutManager linearLayoutManager)
{
// This can happen if a layout pass has not happened yet
if (firstVisibleItemIndex == -1)
{
return(firstVisibleItemIndex);
}
AView centerView;
if (linearLayoutManager.Orientation == LinearLayoutManager.Horizontal)
{
float centerX = recyclerView.Width / 2;
centerView = recyclerView.FindChildViewUnder(centerX, recyclerView.Top);
}
else
{
float centerY = recyclerView.Height / 2;
centerView = recyclerView.FindChildViewUnder(recyclerView.Left, centerY);
}
if (centerView != null)
{
return(recyclerView.GetChildAdapterPosition(centerView));
}
return(firstVisibleItemIndex);
}
public static AView GetCenteredView(this RecyclerView recyclerView)
{
if (!(recyclerView.GetLayoutManager() is LinearLayoutManager linearLayoutManager))
{
return(null);
}
AView centeredView;
if (linearLayoutManager.Orientation == LinearLayoutManager.Horizontal)
{
float centerX = linearLayoutManager.Width / 2;
float centerY = linearLayoutManager.Height / 2;
centeredView = recyclerView.FindChildViewUnder(centerX, centerY);
}
else
{
float centerY = linearLayoutManager.Height / 2;
float centerX = linearLayoutManager.Width / 2;
centeredView = recyclerView.FindChildViewUnder(centerX, centerY);
}
return(centeredView);
}
public override bool OnSingleTapUp(MotionEvent e)
{
View childView = mRecyclerView.FindChildViewUnder(e.GetX(), e.GetY());
if (childView != null && mListener != null)
{
mListener.OnItemClick(childView, mRecyclerView.GetChildAdapterPosition(childView));
}
return(true);
}
/// <summary>
/// 单击事件
/// </summary>
/// <returns><c>true</c>, if single tap up was oned, <c>false</c> otherwise.</returns>
/// <param name="e">E.</param>
public override bool OnSingleTapUp(MotionEvent e)
{
View child = m_RecyclerView.FindChildViewUnder(e.GetX(), e.GetY());
if (child != null)
{
RecyclerView.ViewHolder vh = m_RecyclerView.GetChildViewHolder(child);
int position = vh.LayoutPosition;
if (m_IRecyclerViewClickListerner != null)
{
m_IRecyclerViewClickListerner.OnItemClick(child, position);
}
}
return(true);
}
protected internal override bool ClickAction(RecyclerView view, MotionEvent e)
{
// Get interacted view from x,y coordinate.
Android.Views.View childView = view.FindChildViewUnder(e.GetX(), e.GetY());
if (childView != null)
{
// Find the view holder
AbstractViewHolder holder = (AbstractViewHolder)mRecyclerView.GetChildViewHolder(childView);
int column = holder.AdapterPosition;
// Control to ignore selection color
if (!mTableView.IsIgnoreSelectionColors())
{
mSelectionHandler.SetSelectedColumnPosition(holder, column);
}
if (GetTableViewListener() != null)
{
// Call ITableView listener for item click
GetTableViewListener().OnColumnHeaderClicked(holder, column);
}
return(true);
}
return(false);
}
public bool OnInterceptTouchEvent(RecyclerView view, MotionEvent e)
{
var childView = view.FindChildViewUnder(e.GetX(), e.GetY());
if (childView != null && gestureDetector.OnTouchEvent(e))
{
var intent = new Intent(mainActivity, typeof(ExhibitDetailsActivity));
Exhibit exhibit = null;
for (var i = 0; i < exhibitSet.ActiveSet.Count; ++i)
{
exhibit = exhibitSet.ActiveSet [i];
if (exhibit.Id == childView.ContentDescription)
{
break;
}
}
if (exhibit != null)
{
var pageList = exhibit.Pages;
if (pageList == null || !pageList.Any())
{
Toast.MakeText(mainActivity,
mainActivity.GetString(Resource.String.currently_no_further_info),
ToastLength.Short)
.Show();
return(false);
}
intent.PutExtra(ExhibitDetailsActivity.INTENT_EXTRA_EXHIBIT_ID, exhibit.Id);
ActivityCompat.StartActivity(mainActivity, intent, null);
}
}
return(false);
}
public override void OnLongPress(MotionEvent e)
{
var child = _recyclerView.FindChildViewUnder(e.GetX(), e.GetY());
if (child != null && _clickListener != null)
{
_clickListener.OnLongClick(child, _recyclerView.GetChildAdapterPosition(child));
}
}
public bool OnInterceptTouchEvent(RecyclerView rv, MotionEvent e)
{
View child = rv.FindChildViewUnder(e.GetX(), e.GetY());
if (child != null && clickListener != null && gestureDetector.OnTouchEvent(e))
{
clickListener.OnClick(child, rv.GetChildPosition(child));
}
return false;
}
public bool OnInterceptTouchEvent(RecyclerView rv, MotionEvent e)
{
View childView = rv.FindChildViewUnder(e.GetX(), e.GetY());
if (childView != null && this.gestureDetector.OnTouchEvent(e))
{
this.OnClick(rv, childView, rv.GetChildAdapterPosition(childView));
}
return false;
}
public bool OnInterceptTouchEvent(RecyclerView rv, MotionEvent e)
{
View childView = rv.FindChildViewUnder(e.GetX(), e.GetY());
if (childView != null && this.gestureDetector.OnTouchEvent(e))
{
this.OnClick(rv, childView, rv.GetChildAdapterPosition(childView));
}
return(false);
}
public bool OnInterceptTouchEvent(RecyclerView view, MotionEvent e)
{
var childView = view.FindChildViewUnder(e.GetX(), e.GetY());
if (childView == null || !_getstureDetector.OnTouchEvent(e))
{
return(false);
}
var handler = ItemClickEvent;
handler?.Invoke(this, new ItemClickEvent(childView, view.GetChildPosition(childView)));
return(false);
}
public bool OnInterceptTouchEvent(RecyclerView rv, MotionEvent e)
{
var child = rv.FindChildViewUnder(e.GetX(), e.GetY());
if (child != null && _clicklistener != null && _gestureDetector.OnTouchEvent(e))
{
_clicklistener.OnClick(child, rv.GetChildAdapterPosition(child));
// https://medium.com/@anupdey99/multiple-click-problem-need-to-return-true-4a21b72f0953
return(true);
}
return(false);
}
public bool OnInterceptTouchEvent(RecyclerView recyclerView, MotionEvent @event)
{
var child = recyclerView.FindChildViewUnder(@event.GetX(), @event.GetY());
if (child != null && gestureDetector.OnTouchEvent(@event))
{
var fab = FindViewById <FloatingActionButton>(Resource.Id.fab_add);
var snackbar = Snackbar.Make(fab, Resource.String.Item_Clicked, Snackbar.LengthLong);
snackbar.SetAction("Do Something", this);
snackbar.Show();
return(true);
}
return(false);
}
public RecyclerTouchListener(Context context, RecyclerView recyclerView, IOnClickListener clickListener)
{
this.clickListener = clickListener;
var gestureListener = new GenericOnGestureListener();
gestureListener.ActionOnLongPress = (e) =>
{
View child = recyclerView.FindChildViewUnder(e.GetX(), e.GetY());
if (child != null && clickListener != null)
{
clickListener.OnLongClick(child, recyclerView.GetChildPosition(child));
}
};
gestureListener.FuncOnSingleTapUp = (e) => true;
gestureDetector = new GestureDetector(context, gestureListener);
}
internal void ResolveItem(float x, float y)
{
_touchedView = _recyclerView.FindChildViewUnder(x, y);
if (_touchedView == null)
{
//no child under
_frontView = null;
return;
}
// check if the view is being animated. in that case do not allow to move it
if (RunningAnimationsOn.Contains(_touchedView))
{
_frontView = null;
return;
}
InitViewForItem((SwipeViewHolder <M>)_recyclerView.GetChildViewHolder(_touchedView));
}