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
                });
            }
        }
Esempio n. 2
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        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);
                }
            }
        }