public static void DisposeModelAndChildrenRenderers(this VisualElement view)
{
IVisualElementRenderer renderer;
foreach (var child in view.Descendants().OfType <VisualElement>())
{
renderer = XFPlatform.GetRenderer(child);
XFPlatform.SetRenderer(child, null);
if (renderer == null)
{
continue;
}
renderer.NativeView.RemoveFromSuperview();
renderer.Dispose();
}
renderer = XFPlatform.GetRenderer(view);
if (renderer != null)
{
renderer.NativeView.RemoveFromSuperview();
renderer.Dispose();
}
XFPlatform.SetRenderer(view, null);
}
public static IVisualElementRenderer GetOrCreateRenderer(this VisualElement bindable)
{
var renderer = XFPlatform.GetRenderer(bindable);
if (renderer == null)
{
renderer = XFPlatform.CreateRenderer(bindable);
XFPlatform.SetRenderer(bindable, renderer);
}
return(renderer);
}
void UpdateCell(ViewCell cell)
{
if (_viewCell != null)
{
Device.BeginInvokeOnMainThread(_viewCell.SendDisappearing);
}
_viewCell = cell;
Device.BeginInvokeOnMainThread(_viewCell.SendAppearing);
IVisualElementRenderer renderer;
if (_rendererRef == null || !_rendererRef.TryGetTarget(out renderer))
{
renderer = GetNewRenderer();
}
else
{
if (renderer.Element != null && renderer == Platform.GetRenderer(renderer.Element))
{
renderer.Element.ClearValue(Platform.RendererProperty);
}
var type = Internals.Registrar.Registered.GetHandlerType(_viewCell.View.GetType());
if (renderer.GetType() == type || (renderer is DefaultRenderer && type == null))
{
renderer.SetElement(_viewCell.View);
}
else
{
//when cells are getting reused the element could be already set to another cell
//so we should dispose based on the renderer and not the renderer.Element
Platform.DisposeRendererAndChildren(renderer);
renderer = GetNewRenderer();
}
}
Platform.SetRenderer(_viewCell.View, renderer);
}
void PackContent()
{
ClearContentRenderer();
if (ScrollView.Children.Count == 0 || !(ScrollView.Children[0] is VisualElement))
{
return;
}
var content = (VisualElement)ScrollView.Children[0];
if (Platform.GetRenderer(content) == null)
{
Platform.SetRenderer(content, Platform.CreateRenderer(content));
}
_contentRenderer = Platform.GetRenderer(content);
(ContentView as FlippedClipView).ContentRenderer = _contentRenderer;
DocumentView = _contentRenderer.NativeView;
ContentView.PostsBoundsChangedNotifications = true;
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
Element.PropertyChanged -= OnElementPropertyChanged;
Platform.SetRenderer(Element, null);
if (_appeared)
{
Page.SendDisappearing();
}
_appeared = false;
if (_events != null)
{
_events.Dispose();
_events = null;
}
if (_packager != null)
{
_packager.Dispose();
_packager = null;
}
if (_tracker != null)
{
_tracker.Dispose();
_tracker = null;
}
Element = null;
_disposed = true;
}
base.Dispose(disposing);
}
nfloat CalculateHeightForCell(NSTableView tableView, Cell cell)
{
var viewCell = cell as ViewCell;
double renderHeight;
if (List.RowHeight == -1 && viewCell?.View != null)
{
var target = viewCell.View;
if (_prototype == null)
{
_prototype = Platform.CreateRenderer(target);
Platform.SetRenderer(target, _prototype);
}
else
{
_prototype.SetElement(target);
Platform.SetRenderer(target, _prototype);
}
var req = target.Measure(tableView.Frame.Width, double.PositiveInfinity, MeasureFlags.IncludeMargins);
target.ClearValue(Platform.RendererProperty);
foreach (var descendant in target.Descendants())
{
descendant.ClearValue(Platform.RendererProperty);
}
renderHeight = req.Request.Height;
}
else
{
renderHeight = cell.RenderHeight;
}
return(renderHeight > 0 ? (nfloat)renderHeight : ListViewRenderer.DefaultRowHeight);
}
void UpdateControllers()
{
ClearControllers();
if (Platform.GetRenderer(MasterDetailPage.Master) == null)
{
Platform.SetRenderer(MasterDetailPage.Master, Platform.CreateRenderer(MasterDetailPage.Master));
}
if (Platform.GetRenderer(MasterDetailPage.Detail) == null)
{
Platform.SetRenderer(MasterDetailPage.Detail, Platform.CreateRenderer(MasterDetailPage.Detail));
}
AddSplitViewItem(new NSSplitViewItem
{
ViewController = new ViewControllerWrapper(Platform.GetRenderer(MasterDetailPage.Master))
});
AddSplitViewItem(new NSSplitViewItem
{
ViewController = new ViewControllerWrapper(Platform.GetRenderer(MasterDetailPage.Detail))
});
UpdateChildrenLayout();
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
if (Carousel != null)
{
Carousel.PropertyChanged -= OnPropertyChanged;
Carousel.PagesChanged -= OnPagesChanged;
}
Platform.SetRenderer(Element, null);
if (_appeared)
{
_appeared = false;
Page?.SendDisappearing();
}
if (_events != null)
{
_events.Dispose();
_events = null;
}
if (_tracker != null)
{
_tracker.Dispose();
_tracker = null;
}
Element = null;
_disposed = true;
}
base.Dispose(disposing);
}
void TeardownPage(Page page)
{
page.PropertyChanged -= OnPagePropertyChanged;
Platform.SetRenderer(page, null);
}