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 OnDisplayPageModalRequested(object sender, ModalHostPage.DisplayPageModalRequestedEventArgs e)
{
e.PageToDisplay.Parent = this.Element;
IVisualElementRenderer renderer = XFPlatform.GetRenderer(e.PageToDisplay);
if (renderer == null)
{
renderer = XFPlatform.CreateRenderer(e.PageToDisplay);
XFPlatform.SetRenderer(e.PageToDisplay, renderer);
}
// TODO: Now display our modal page.
var modalElement = renderer.GetNativeElement();
(Control as FormsLightNavigationPage)?.PushModal(modalElement, true);
}
void LoadMaster()
{
if (_masterRenderer != null && _popup != null)
{
_popup.Child = null;
}
Page master = Element.Master;
if (Platform.GetRenderer(master) == null)
{
Platform.SetRenderer(master, Platform.CreateRenderer(master));
}
_masterRenderer = Platform.GetRenderer(master);
var control = _masterRenderer as Panel;
if (control != null && master.BackgroundColor == Color.Default)
{
control.Background = Color.Black.ToBrush();
}
}
void LoadDetail()
{
if (_detailRenderer != null)
{
Children.Remove(_detailRenderer.ContainerElement);
}
Page detail = Element.Detail;
if (Platform.GetRenderer(detail) == null)
{
Platform.SetRenderer(detail, Platform.CreateRenderer(detail));
}
_detailRenderer = Platform.GetRenderer(detail);
Children.Clear();
if (_detailRenderer != null)
{
Children.Add(_detailRenderer.ContainerElement);
}
}
void UpdateFooter()
{
var footer = Element.FooterElement;
var footerView = (VisualElement)footer;
if (_footerRenderer is object)
{
Control.Children.Remove(_footerRenderer.GetNativeElement());
_footerRenderer.Dispose();
}
if (footerView is null)
{
return;
}
_footerRenderer = Platform.CreateRenderer(footerView);
Platform.SetRenderer(footerView, _footerRenderer);
WGrid.SetRow(_footerRenderer.GetNativeElement(), 2);
Control.Children.Add(_footerRenderer.GetNativeElement());
}
void UpdateHeader()
{
var header = Element.HeaderElement;
var headerView = (VisualElement)header;
if (_headerRenderer is object)
{
Control.Children.Remove(_headerRenderer.GetNativeElement());
_headerRenderer.Dispose();
}
if (headerView is null)
{
return;
}
_headerRenderer = Platform.CreateRenderer(headerView);
Platform.SetRenderer(headerView, _headerRenderer);
WGrid.SetRow(_headerRenderer.GetNativeElement(), 0);
Control.Children.Add(_headerRenderer.GetNativeElement());
}
public WrapperControl(View view)
{
_view = view;
_view.MeasureInvalidated += (sender, args) => InvalidateMeasure();
IVisualElementRenderer visualElementRenderer = Platform.CreateRenderer(view);
Platform.SetRenderer(view, visualElementRenderer);
Content = visualElementRenderer.ContainerElement;
// make sure we re-measure once the template is applied
var frameworkElement = visualElementRenderer.ContainerElement as FrameworkElement;
if (frameworkElement != null)
{
frameworkElement.Loaded += (sender, args) =>
{
((IVisualElementController)_view).InvalidateMeasure(InvalidationTrigger.MeasureChanged);
InvalidateMeasure();
};
}
}
void UpdateRootPage(IReadOnlyList <Page> stack)
{
Page first = stack.FirstOrDefault();
if (first == _currentRoot)
{
return;
}
if (Children.Count > 0)
{
var renderer = Children[0] as IVisualElementRenderer;
if (renderer != null)
{
Children.RemoveAt(0);
var page = renderer.Element as Page;
if (page != null)
{
page.IgnoresContainerArea = false;
}
if (!stack.Contains(renderer.Element))
{
Platform.SetRenderer(renderer.Element, null);
}
}
}
_currentRoot = first;
if (first == null)
{
return;
}
first.IgnoresContainerArea = true;
IVisualElementRenderer firstRenderer = Platform.GetRenderer(first);
if (firstRenderer == null)
{
firstRenderer = Platform.CreateRenderer(first);
Platform.SetRenderer(first, firstRenderer);
}
var uiElement = (UIElement)firstRenderer;
var platform = Element.Platform as Platform;
Canvas canvas = platform?.GetCanvas();
//We could be swapping the visible page,
//so let's make sure we remove it
if (canvas.Children.Contains(uiElement))
{
canvas.Children.Remove(uiElement);
}
Children.Add(uiElement);
// we removed the previous root page, and the new root page is the one being presented
// at this time there's only 1 page now on the stack (the navigationpage with root)
// we need to update the platform to set this root page as the visible again
bool updateRoot = Element.CurrentPage == first && _isRemoving;
if (updateRoot)
{
platform.SetCurrent(Element, false);
}
}
public static void SetRenderer(this VisualElement self, IVisualElementRenderer renderer)
{
Platform.SetRenderer(self, renderer);
}