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);
}
/// <summary>
/// Updates the master detail containers.
/// </summary>
void UpdateMasterDetailContainers()
{
//((MasterDetailPage)Element).Master.PropertyChanged -= HandleMasterPropertyChanged;
EmptyContainers();
if (CurrentPlatform.GetRenderer(((MasterDetailPage)Element).Master) == null)
{
CurrentPlatform.SetRenderer(((MasterDetailPage)Element).Master, CurrentPlatform.CreateRenderer(((MasterDetailPage)Element).Master));
}
if (CurrentPlatform.GetRenderer(((MasterDetailPage)Element).Detail) == null)
{
CurrentPlatform.SetRenderer(((MasterDetailPage)Element).Detail, CurrentPlatform.CreateRenderer(((MasterDetailPage)Element).Detail));
}
var masterRenderer = CurrentPlatform.GetRenderer(((MasterDetailPage)Element).Master);
var detailRenderer = CurrentPlatform.GetRenderer(((MasterDetailPage)Element).Detail);
//((MasterDetailPage)Element).Master.PropertyChanged += HandleMasterPropertyChanged;
this.MenuViewController.View.AddSubview(masterRenderer.NativeView);
this.MenuViewController.AddChildViewController(masterRenderer.ViewController);
this.RootViewController.View.AddSubview(detailRenderer.NativeView);
this.RootViewController.AddChildViewController(detailRenderer.ViewController);
SetNeedsStatusBarAppearanceUpdate();
}
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 SetupPage(Page page, int index)
{
IVisualElementRenderer renderer = Platform.GetRenderer(page);
if (renderer == null)
{
renderer = Platform.CreateRenderer(page);
Platform.SetRenderer(page, renderer);
}
page.PropertyChanged -= OnPagePropertyChanged;
page.PropertyChanged += OnPagePropertyChanged;
}
protected virtual void LoadRenderers()
{
var currentItem = ShellSection.CurrentItem;
for (int i = 0; i < ShellSectionController.GetItems().Count; i++)
{
ShellContent item = ShellSectionController.GetItems()[i];
var page = ((IShellContentController)item).GetOrCreateContent();
var renderer = Platform.CreateRenderer(page);
Platform.SetRenderer(page, renderer);
AddChildViewController(renderer.ViewController);
if (item == currentItem)
{
_containerArea.AddSubview(renderer.NativeView);
_currentIndex = i;
}
_renderers[item] = renderer;
}
}
void UpdateFlyoutPageContainers()
{
((FlyoutPage)Element).Flyout.PropertyChanged -= HandleFlyoutPropertyChanged;
EmptyContainers();
if (Platform.GetRenderer(((FlyoutPage)Element).Flyout) == null)
{
Platform.SetRenderer(((FlyoutPage)Element).Flyout, Platform.CreateRenderer(((FlyoutPage)Element).Flyout));
}
if (Platform.GetRenderer(((FlyoutPage)Element).Detail) == null)
{
Platform.SetRenderer(((FlyoutPage)Element).Detail, Platform.CreateRenderer(((FlyoutPage)Element).Detail));
}
var flyoutRenderer = Platform.GetRenderer(((FlyoutPage)Element).Flyout);
var detailRenderer = Platform.GetRenderer(((FlyoutPage)Element).Detail);
((FlyoutPage)Element).Flyout.PropertyChanged += HandleFlyoutPropertyChanged;
UIView flyoutView = flyoutRenderer.NativeView;
_flyoutController.View.AddSubview(flyoutView);
_flyoutController.AddChildViewController(flyoutRenderer.ViewController);
UIView detailView = detailRenderer.NativeView;
_detailController.View.AddSubview(detailView);
_detailController.AddChildViewController(detailRenderer.ViewController);
SetNeedsStatusBarAppearanceUpdate();
if (Forms.RespondsToSetNeedsUpdateOfHomeIndicatorAutoHidden)
{
SetNeedsUpdateOfHomeIndicatorAutoHidden();
}
detailRenderer.ViewController.View.Superview.BackgroundColor = Xamarin.Forms.Color.Black.ToUIColor();
ToggleAccessibilityElementsHidden();
}
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 = Registrar.Registered.GetHandlerType(_viewCell.View.GetType());
if (renderer.GetType() == type || (renderer is Platform.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
var platform = renderer.Element.Platform as Platform;
platform.DisposeRendererAndChildren(renderer);
renderer = GetNewRenderer();
}
}
Platform.SetRenderer(_viewCell.View, renderer);
}
protected virtual void OnChildAdded(VisualElement view)
{
if (_isDisposed)
{
return;
}
var viewRenderer = Platform.CreateRenderer(view);
Platform.SetRenderer(view, viewRenderer);
var uiview = Renderer.NativeView;
uiview.AddSubview(viewRenderer.NativeView);
if (Renderer.ViewController != null && viewRenderer.ViewController != null)
{
Renderer.ViewController.AddChildViewController(viewRenderer.ViewController);
}
EnsureChildrenOrder();
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
Element.PropertyChanged -= OnHandlePropertyChanged;
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;
Container?.Dispose();
_pageContainer = null;
_disposed = true;
}
base.Dispose(disposing);
}
void UpdateMasterDetailContainers()
{
((MasterDetailPage)Element).Master.PropertyChanged -= HandleMasterPropertyChanged;
EmptyContainers();
if (Platform.GetRenderer(((MasterDetailPage)Element).Master) == null)
Platform.SetRenderer(((MasterDetailPage)Element).Master, Platform.CreateRenderer(((MasterDetailPage)Element).Master));
if (Platform.GetRenderer(((MasterDetailPage)Element).Detail) == null)
Platform.SetRenderer(((MasterDetailPage)Element).Detail, Platform.CreateRenderer(((MasterDetailPage)Element).Detail));
var masterRenderer = Platform.GetRenderer(((MasterDetailPage)Element).Master);
var detailRenderer = Platform.GetRenderer(((MasterDetailPage)Element).Detail);
((MasterDetailPage)Element).Master.PropertyChanged += HandleMasterPropertyChanged;
_masterController.View.AddSubview(masterRenderer.NativeView);
_masterController.AddChildViewController(masterRenderer.ViewController);
_detailController.View.AddSubview(detailRenderer.NativeView);
_detailController.AddChildViewController(detailRenderer.ViewController);
}
void UpdateFlyoutFooter(View view)
{
if (_footer == view)
{
return;
}
if (_footer != null)
{
var oldRenderer = Platform.GetRenderer(_footer);
var oldFooterView = _footerView;
_tableViewController.FooterView = null;
_footerView = null;
oldFooterView?.RemoveFromSuperview();
if (_footer != null)
{
_footer.MeasureInvalidated -= OnFooterMeasureInvalidated;
}
_footer.ClearValue(Platform.RendererProperty);
oldRenderer?.Dispose();
}
_footer = view;
if (_footer != null)
{
var renderer = Platform.CreateRenderer(_footer);
_footerView = renderer.NativeView;
Platform.SetRenderer(_footer, renderer);
View.AddSubview(_footerView);
_footerView.ClipsToBounds = true;
_tableViewController.FooterView = _footerView;
_footer.MeasureInvalidated += OnFooterMeasureInvalidated;
}
_tableViewController.FooterView = _footerView;
}
void UpdateMasterDetailContainers()
{
((MasterDetailPage)Element).Master.PropertyChanged -= HandleMasterPropertyChanged;
EmptyContainers();
if (Platform.GetRenderer(((MasterDetailPage)Element).Master) == null)
{
Platform.SetRenderer(((MasterDetailPage)Element).Master, Platform.CreateRenderer(((MasterDetailPage)Element).Master));
}
if (Platform.GetRenderer(((MasterDetailPage)Element).Detail) == null)
{
Platform.SetRenderer(((MasterDetailPage)Element).Detail, Platform.CreateRenderer(((MasterDetailPage)Element).Detail));
}
var masterRenderer = Platform.GetRenderer(((MasterDetailPage)Element).Master);
var detailRenderer = Platform.GetRenderer(((MasterDetailPage)Element).Detail);
((MasterDetailPage)Element).Master.PropertyChanged += HandleMasterPropertyChanged;
UIView masterView = masterRenderer.NativeView;
_masterController.View.AddSubview(masterView);
_masterController.AddChildViewController(masterRenderer.ViewController);
UIView detailView = detailRenderer.NativeView;
_detailController.View.AddSubview(detailView);
_detailController.AddChildViewController(detailRenderer.ViewController);
SetNeedsStatusBarAppearanceUpdate();
if (Forms.RespondsToSetNeedsUpdateOfHomeIndicatorAutoHidden)
{
SetNeedsUpdateOfHomeIndicatorAutoHidden();
}
detailRenderer.ViewController.View.Superview.BackgroundColor = Xamarin.Forms.Color.Black.ToUIColor();
}
void InsertPage(ContentPage page, int index)
{
IVisualElementRenderer renderer = Platform.GetRenderer(page);
if (renderer == null)
{
renderer = Platform.CreateRenderer(page);
Platform.SetRenderer(page, renderer);
}
UIView container = new PageContainer(page);
container.AddSubview(renderer.NativeView);
_containerMap[page] = container;
AddChildViewController(renderer.ViewController);
_scrollView.InsertSubview(container, index);
if ((index == 0 && SelectedIndex == 0) || (index < SelectedIndex))
{
ScrollToPage(SelectedIndex + 1, false);
}
}
void UpdateMasterDetailContainers()
{
((MasterDetailPage)Element).Master.PropertyChanged -= HandleMasterPropertyChanged;
EmptyContainers();
if (Platform.GetRenderer(((MasterDetailPage)Element).Master) == null)
{
Platform.SetRenderer(((MasterDetailPage)Element).Master, Platform.CreateRenderer(((MasterDetailPage)Element).Master));
}
if (Platform.GetRenderer(((MasterDetailPage)Element).Detail) == null)
{
Platform.SetRenderer(((MasterDetailPage)Element).Detail, Platform.CreateRenderer(((MasterDetailPage)Element).Detail));
}
var masterRenderer = Platform.GetRenderer(((MasterDetailPage)Element).Master);
var detailRenderer = Platform.GetRenderer(((MasterDetailPage)Element).Detail);
((MasterDetailPage)Element).Master.PropertyChanged += HandleMasterPropertyChanged;
UIView masterView = masterRenderer.NativeView;
_masterController.View.AddSubview(masterView);
_masterController.AddChildViewController(masterRenderer.ViewController);
UIView detailView = detailRenderer.NativeView;
_detailController.View.AddSubview(detailView);
_detailController.AddChildViewController(detailRenderer.ViewController);
SetNeedsStatusBarAppearanceUpdate();
if (Forms.IsiOS11OrNewer)
{
SetNeedsUpdateOfHomeIndicatorAutoHidden();
}
}
internal void Disconnect(Shell shell = null, bool keepRenderer = false)
{
ViewMeasureInvalidated = null;
View.MeasureInvalidated -= MeasureInvalidated;
if (_bindingContext != null && _bindingContext is BaseShellItem baseShell)
{
baseShell.PropertyChanged -= OnElementPropertyChanged;
}
_bindingContext = null;
if (!keepRenderer)
{
Platform.SetRenderer(View, null);
}
if (shell != null)
{
shell.RemoveLogicalChild(shell);
}
View = null;
TableView = null;
}
internal UIContainerCell(string cellId, View view, Shell shell, object context) : base(UITableViewCellStyle.Default, cellId)
{
View = view;
View.MeasureInvalidated += MeasureInvalidated;
SelectionStyle = UITableViewCellSelectionStyle.None;
_renderer = Platform.GetRenderer(view);
if (_renderer == null)
{
_renderer = Platform.CreateRenderer(view);
Platform.SetRenderer(view, _renderer);
}
ContentView.AddSubview(_renderer.NativeView);
_renderer.NativeView.ClipsToBounds = true;
ContentView.ClipsToBounds = true;
BindingContext = context;
if (shell != null)
{
shell.AddLogicalChild(View);
}
}
void TeardownPage(Page page, int index)
{
page.PropertyChanged -= OnPagePropertyChanged;
Platform.SetRenderer(page, null);
}
public void SetCustomContent(View content)
{
if (content == Content)
{
return;
}
removeScolledEvent?.Invoke();
removeScolledEvent = null;
if (Content != null)
{
var oldRenderer = Platform.GetRenderer(Content);
var oldContentView = ContentView;
var oldContent = Content;
Content = null;
ContentView = null;
oldContent.ClearValue(Platform.RendererProperty);
oldContentView?.RemoveFromSuperview();
oldRenderer?.Dispose();
}
// If the user hasn't defined custom content then only the ContentView is set
else if (ContentView != null)
{
var oldContentView = ContentView;
ContentView = null;
oldContentView.RemoveFromSuperview();
}
Content = content;
if (Content != null)
{
var renderer = Platform.CreateRenderer(Content);
ContentView = renderer.NativeView;
Platform.SetRenderer(Content, renderer);
ContentView.ClipsToBounds = true;
// not sure if there's a more efficient way to do this
// I can test the native control to see if it inherits from UIScrollView
// But the CollectionViewRenderer doesn't inherit from UIScrollView
if (Content is ScrollView sv)
{
sv.Scrolled += ScrollViewScrolled;
removeScolledEvent = () => sv.Scrolled -= ScrollViewScrolled;
void ScrollViewScrolled(object sender, ScrolledEventArgs e) =>
OnScrolled((nfloat)sv.ScrollY);
}
else if (Content is CollectionView cv)
{
cv.Scrolled += CollectionViewScrolled;
removeScolledEvent = () => cv.Scrolled -= CollectionViewScrolled;
void CollectionViewScrolled(object sender, ItemsViewScrolledEventArgs e) =>
OnScrolled((nfloat)e.VerticalOffset);
}
else if (Content is ListView lv)
{
lv.Scrolled += ListViewScrolled;
removeScolledEvent = () => lv.Scrolled -= ListViewScrolled;
void ListViewScrolled(object sender, ScrolledEventArgs e) =>
OnScrolled((nfloat)e.ScrollY);
}
}
}
