private void OnScrollEvent(object sender, TableSourceEvents e)
{
var source = Source;
if (source != null && this._isDisposing == false)
{
source.FireScrollEvent(new ScrollEventArgs
{
iOSFirstCellVisible = e.FirstViewCell,
iOSLastCellVisible = e.LastViewCell,
iOSFirstPositionVisible = e.FirstRow,
iOSLastPositionVisible = e.LastRow,
iOSFirstRowVisible = e.IsFirstRowVisible,
iOSLastRowVisible = e.IsLastRowVisible,
YPosition = e.Y
});
}
}
public override void WillDisplay(UITableView tableView, UITableViewCell cell, Foundation.NSIndexPath indexPath)
{
var visibleCell = tableView.VisibleCells;
if (visibleCell.Count() > 0)
{
var first = visibleCell.First();
var last = visibleCell.Last();
var firstCellPath = tableView.IndexPathForCell(first);
var lastCellPath = tableView.IndexPathForCell(last);
ViewCell firstViewCell = null;
ViewCell lastViewCell = null;
try
{
firstViewCell = first.GetType().GetProperty("ViewCell").GetValue(first) as Xamarin.Forms.ViewCell;
lastViewCell = last.GetType().GetProperty("ViewCell").GetValue(last) as Xamarin.Forms.ViewCell;
}
catch
{
}
var sectionsAmount = tableView.NumberOfSections();
var rowsAmount = tableView.NumberOfRowsInSection(indexPath.Section);
if (indexPath.Section == sectionsAmount - 1 && indexPath.Row == rowsAmount - 1)
{
// This is the last cell in the table
this._IsFirstRowVisible = false;
this._IsLastRowVisible = true;
}
else if (indexPath.Section == 0 && (indexPath.Row == 0))
{
this._IsFirstRowVisible = false;
this._IsLastRowVisible = true;
}
else if (this._IsStartedScrolling)
{
this._IsFirstRowVisible = false;
this._IsLastRowVisible = false;
}
var handler = this.OnScrollEvent;
// fire event
if (handler != null)
{
var evt = new TableSourceEvents
{
Y = _LastYPosition,
IsFirstRowVisible = this._IsFirstRowVisible,
IsLastRowVisible = this._IsLastRowVisible,
FirstViewCell = firstViewCell,
LastViewCell = lastViewCell
};
if (firstCellPath != null)
{
evt.FirstRow = new int[] { firstCellPath.Section, firstCellPath.Row };
}
else
{
evt.FirstRow = new int[] { -1, -1 };
}
if (lastCellPath != null)
{
evt.LastRow = new int[] { lastCellPath.Section, lastCellPath.Row };
}
else
{
evt.LastRow = new int[] { -1, -1 };
}
handler(this, evt);
}
}
}