protected override void Dispose(bool disposing)
{
if (disposing && _insetTracker != null)
{
_insetTracker.Dispose();
_insetTracker = null;
var viewsToLookAt = new Stack <UIView>(Subviews);
while (viewsToLookAt.Count > 0)
{
var view = viewsToLookAt.Pop();
var viewCellRenderer = view as ViewCellRenderer.ViewTableCell;
if (viewCellRenderer != null)
{
viewCellRenderer.Dispose();
}
else
{
foreach (var child in view.Subviews)
{
viewsToLookAt.Push(child);
}
}
}
}
base.Dispose(disposing);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_packager == null)
{
return;
}
Element?.ClearValue(Platform.RendererProperty);
SetElement(null);
_packager.Dispose();
_packager = null;
_tracker.NativeControlUpdated -= OnNativeControlUpdated;
_tracker.Dispose();
_tracker = null;
_events.Dispose();
_events = null;
_insetTracker.Dispose();
_insetTracker = null;
ScrollAnimationEnded -= HandleScrollAnimationEnded;
Scrolled -= HandleScrolled;
}
base.Dispose(disposing);
}
public void SetElement(VisualElement element)
{
_requestedScroll = null;
var oldElement = Element;
Element = element;
if (oldElement != null)
{
oldElement.PropertyChanged -= HandlePropertyChanged;
((ScrollView)oldElement).ScrollToRequested -= OnScrollToRequested;
}
if (element != null)
{
element.PropertyChanged += HandlePropertyChanged;
((ScrollView)element).ScrollToRequested += OnScrollToRequested;
if (_packager == null)
{
_packager = new VisualElementPackager(this);
_packager.Load();
_tracker = new VisualElementTracker(this);
_tracker.NativeControlUpdated += OnNativeControlUpdated;
_events = new EventTracker(this);
_events.LoadEvents(this);
_insetTracker = new KeyboardInsetTracker(this, () => Window, insets => ContentInset = ScrollIndicatorInsets = insets, point =>
{
var offset = ContentOffset;
offset.Y += point.Y;
SetContentOffset(offset, true);
});
}
UpdateDelaysContentTouches();
UpdateContentSize();
UpdateBackgroundColor();
UpdateIsEnabled();
UpdateVerticalScrollBarVisibility();
UpdateHorizontalScrollBarVisibility();
_shellScrollTracker = new ShellScrollViewTracker(this);
OnElementChanged(new VisualElementChangedEventArgs(oldElement, element));
EffectUtilities.RegisterEffectControlProvider(this, oldElement, element);
if (element != null)
{
element.SendViewInitialized(this);
}
if (!string.IsNullOrEmpty(element.AutomationId))
{
AccessibilityIdentifier = element.AutomationId;
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <TableView> e)
{
if (e.NewElement != null)
{
var style = UITableViewStyle.Plain;
if (e.NewElement.Intent != TableIntent.Data)
{
style = UITableViewStyle.Grouped;
}
if (Control == null || Control.Style != style)
{
if (Control != null)
{
_insetTracker.Dispose();
Control.Dispose();
}
var tv = new UITableView(RectangleF.Empty, style);
_originalBackgroundView = tv.BackgroundView;
SetNativeControl(tv);
if (Forms.IsiOS9OrNewer)
{
tv.CellLayoutMarginsFollowReadableWidth = false;
}
_insetTracker = new KeyboardInsetTracker(tv, () => Control.Window, insets => Control.ContentInset = Control.ScrollIndicatorInsets = insets, point =>
{
var offset = Control.ContentOffset;
offset.Y += point.Y;
Control.SetContentOffset(offset, true);
});
}
SetSource();
UpdateRowHeight();
UpdateBackgroundView();
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
// check inset tracker for null to
if (disposing && _insetTracker != null)
{
_insetTracker.Dispose();
_insetTracker = null;
var viewsToLookAt = new Stack <UIView>(Subviews);
while (viewsToLookAt.Count > 0)
{
var view = viewsToLookAt.Pop();
var viewCellRenderer = view as ViewCellRenderer.ViewTableCell;
if (viewCellRenderer != null)
{
viewCellRenderer.Dispose();
}
else
{
foreach (var child in view.Subviews)
{
viewsToLookAt.Push(child);
}
}
}
if (Element != null)
{
var templatedItems = TemplatedItemsView.TemplatedItems;
templatedItems.CollectionChanged -= OnCollectionChanged;
templatedItems.GroupedCollectionChanged -= OnGroupedCollectionChanged;
}
if (_tableViewController != null)
{
_tableViewController.Dispose();
_tableViewController = null;
}
}
if (disposing)
{
if (_headerRenderer != null)
{
var platform = _headerRenderer.Element.Platform as Platform;
if (platform != null)
{
platform.DisposeModelAndChildrenRenderers(_headerRenderer.Element);
}
_headerRenderer = null;
}
if (_footerRenderer != null)
{
var platform = _footerRenderer.Element.Platform as Platform;
if (platform != null)
{
platform.DisposeModelAndChildrenRenderers(_footerRenderer.Element);
}
_footerRenderer = null;
}
var headerView = Controller?.HeaderElement as VisualElement;
if (headerView != null)
{
headerView.MeasureInvalidated -= OnHeaderMeasureInvalidated;
}
Control?.TableHeaderView?.Dispose();
var footerView = Controller?.FooterElement as VisualElement;
if (footerView != null)
{
footerView.MeasureInvalidated -= OnFooterMeasureInvalidated;
}
Control?.TableFooterView?.Dispose();
}
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs <ListView> e)
{
_requestedScroll = null;
if (e.OldElement != null)
{
var controller = (IListViewController)e.OldElement;
var headerView = (VisualElement)controller.HeaderElement;
if (headerView != null)
{
headerView.MeasureInvalidated -= OnHeaderMeasureInvalidated;
}
var footerView = (VisualElement)controller.FooterElement;
if (footerView != null)
{
footerView.MeasureInvalidated -= OnFooterMeasureInvalidated;
}
controller.ScrollToRequested -= OnScrollToRequested;
var templatedItems = ((ITemplatedItemsView <Cell>)e.OldElement).TemplatedItems;
templatedItems.CollectionChanged -= OnCollectionChanged;
templatedItems.GroupedCollectionChanged -= OnGroupedCollectionChanged;
}
if (e.NewElement != null)
{
if (Control == null)
{
_tableViewController = new FormsUITableViewController(e.NewElement);
SetNativeControl(_tableViewController.TableView);
if (Forms.IsiOS9OrNewer)
{
Control.CellLayoutMarginsFollowReadableWidth = false;
}
_insetTracker = new KeyboardInsetTracker(_tableViewController.TableView, () => Control.Window, insets => Control.ContentInset = Control.ScrollIndicatorInsets = insets, point =>
{
var offset = Control.ContentOffset;
offset.Y += point.Y;
Control.SetContentOffset(offset, true);
});
}
_shouldEstimateRowHeight = true;
var controller = (IListViewController)e.NewElement;
controller.ScrollToRequested += OnScrollToRequested;
var templatedItems = ((ITemplatedItemsView <Cell>)e.NewElement).TemplatedItems;
templatedItems.CollectionChanged += OnCollectionChanged;
templatedItems.GroupedCollectionChanged += OnGroupedCollectionChanged;
UpdateRowHeight();
Control.Source = _dataSource = e.NewElement.HasUnevenRows ? new UnevenListViewDataSource(e.NewElement, _tableViewController) : new ListViewDataSource(e.NewElement, _tableViewController);
UpdateEstimatedRowHeight();
UpdateHeader();
UpdateFooter();
UpdatePullToRefreshEnabled();
UpdateIsRefreshing();
UpdateSeparatorColor();
UpdateSeparatorVisibility();
var selected = e.NewElement.SelectedItem;
if (selected != null)
{
_dataSource.OnItemSelected(null, new SelectedItemChangedEventArgs(selected));
}
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
if (disposing)
{
if (_insetTracker != null)
{
_insetTracker.Dispose();
_insetTracker = null;
}
foreach (UIView subview in Subviews)
{
DisposeSubviews(subview);
}
if (Element != null)
{
var templatedItems = TemplatedItemsView.TemplatedItems;
templatedItems.CollectionChanged -= OnCollectionChanged;
templatedItems.GroupedCollectionChanged -= OnGroupedCollectionChanged;
}
if (_dataSource != null)
{
_dataSource.Dispose();
_dataSource = null;
}
if (_tableViewController != null)
{
_tableViewController.Dispose();
_tableViewController = null;
}
if (_headerRenderer != null)
{
var platform = _headerRenderer.Element?.Platform as Platform;
platform?.DisposeModelAndChildrenRenderers(_headerRenderer.Element);
_headerRenderer = null;
}
if (_footerRenderer != null)
{
var platform = _footerRenderer.Element?.Platform as Platform;
platform?.DisposeModelAndChildrenRenderers(_footerRenderer.Element);
_footerRenderer = null;
}
var headerView = Controller?.HeaderElement as VisualElement;
if (headerView != null)
{
headerView.MeasureInvalidated -= OnHeaderMeasureInvalidated;
}
Control?.TableHeaderView?.Dispose();
var footerView = Controller?.FooterElement as VisualElement;
if (footerView != null)
{
footerView.MeasureInvalidated -= OnFooterMeasureInvalidated;
}
Control?.TableFooterView?.Dispose();
}
_disposed = true;
base.Dispose(disposing);
}