protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
Controller.ScrollToRequested -= OnScrollToRequested;
if (_headerRenderer != null)
{
AppCompat.Platform.ClearRenderer(_headerRenderer.View);
_headerRenderer.Dispose();
_headerRenderer = null;
}
_headerView?.Dispose();
_headerView = null;
if (_footerRenderer != null)
{
AppCompat.Platform.ClearRenderer(_footerRenderer.View);
_footerRenderer.Dispose();
_footerRenderer = null;
}
_footerView?.Dispose();
_footerView = null;
if (Control != null)
{
// Unhook the adapter from the ListView before disposing of it
Control.Adapter = null;
Control.SetOnScrollListener(null);
}
if (_adapter != null)
{
_adapter.Dispose();
_adapter = null;
}
}
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs <ListView> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
((IListViewController)e.OldElement).ScrollToRequested -= OnScrollToRequested;
if (Control != null)
{
// Unhook the adapter from the ListView before disposing of it
Control.Adapter = null;
Control.SetOnScrollListener(null);
}
if (_adapter != null)
{
_adapter.Dispose();
_adapter = null;
}
}
if (e.NewElement != null)
{
AListView nativeListView = Control;
if (nativeListView == null)
{
var ctx = Context;
nativeListView = CreateNativeControl();
_refresh = CreateNativePullToRefresh(ctx);
_refresh.SetOnRefreshListener(this);
_refresh.AddView(nativeListView, new LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent));
SetNativeControl(nativeListView, _refresh);
_headerView = new Container(ctx);
nativeListView.AddHeaderView(_headerView, null, false);
_footerView = new Container(ctx);
nativeListView.AddFooterView(_footerView, null, false);
}
((IListViewController)e.NewElement).ScrollToRequested += OnScrollToRequested;
Control?.SetOnScrollListener(new ListViewScrollDetector(this));
nativeListView.DividerHeight = 0;
nativeListView.Focusable = false;
nativeListView.DescendantFocusability = DescendantFocusability.AfterDescendants;
nativeListView.OnFocusChangeListener = this;
nativeListView.Adapter = _adapter = e.NewElement.IsGroupingEnabled && e.NewElement.OnThisPlatform().IsFastScrollEnabled() ? new GroupedListViewAdapter(Context, nativeListView, e.NewElement) : new ListViewAdapter(Context, nativeListView, e.NewElement);
_adapter.HeaderView = _headerView;
_adapter.FooterView = _footerView;
_adapter.IsAttachedToWindow = _isAttached;
UpdateHeader();
UpdateFooter();
UpdateIsSwipeToRefreshEnabled();
UpdateFastScrollEnabled();
UpdateSelectionMode();
UpdateSpinnerColor();
UpdateHorizontalScrollBarVisibility();
UpdateVerticalScrollBarVisibility();
}
}