void ClearRenderers(IVisualElementRenderer renderer)
{
if (renderer == null)
{
return;
}
var subviews = renderer.GetNativeElement().Subviews;
for (var i = 0; i < subviews.Count; i++)
{
if (subviews[i] is IVisualElementRenderer childRenderer)
{
PushRenderer(childRenderer);
// The ListView CalculateHeightForCell method can create renderers and dispose its child renderers before this is called.
// Thus, it is possible that this work is already completed.
if (childRenderer.Element != null && ReferenceEquals(childRenderer, Platform.GetRenderer(childRenderer.Element)))
{
childRenderer.Element.ClearValue(Platform.RendererProperty);
}
}
renderer.GetNativeElement().Remove(subviews[i]);
}
}
// If the control size changes, then re-layout the header and footer.
private void Grid_SizeChanged(object sender, SizeChangedEventArgs e)
{
if (_headerRenderer is object)
{
_headerRenderer.GetNativeElement().Width = e.NewSize.Width;
_headerRenderer.GetNativeElement().UpdateLayout();
var header = Element.HeaderElement;
var headerView = (VisualElement)header;
SizeRequest request = headerView.Measure(4096, 4096);
Layout.LayoutChildIntoBoundingRegion(headerView, new Rectangle(0, 0, e.NewSize.Width, request.Request.Height));
}
if (_footerRenderer is object)
{
_footerRenderer.GetNativeElement().Width = e.NewSize.Width;
_footerRenderer.GetNativeElement().UpdateLayout();
var footer = Element.FooterElement;
var footerView = (VisualElement)footer;
SizeRequest request = footerView.Measure(4096, 4096);
Layout.LayoutChildIntoBoundingRegion(footerView, new Rectangle(0, 0, e.NewSize.Width, request.Request.Height));
}
}
void EnsureZIndex()
{
if (ElementController.LogicalChildren.Count == 0)
{
return;
}
for (var z = 0; z < ElementController.LogicalChildren.Count; z++)
{
var child = ElementController.LogicalChildren[z] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer childRenderer = Platform.GetRenderer(child);
if (childRenderer == null)
{
continue;
}
if (CanvasExtensions.GetZIndex(childRenderer.GetNativeElement()) != (z + 1))
{
if (!_isZChanged)
{
_isZChanged = true;
}
CanvasExtensions.SetZIndex(childRenderer.GetNativeElement(), z + 1);
}
}
}
void FillChildrenWithRenderers(VisualElement element)
{
foreach (var logicalChild in ((IElementController)element).LogicalChildren)
{
if (logicalChild is VisualElement child)
{
var renderer = GetFreeRenderer(child) ?? Platform.CreateRenderer(child);
Platform.SetRenderer(child, renderer);
_parent.GetNativeElement().Add(renderer.GetNativeElement());
}
}
}
protected override Avalonia.Size ArrangeOverride(Avalonia.Size finalSize)
{
if (Element == null)
{
return(finalSize);
}
Element.IsInNativeLayout = true;
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
var child = ElementController.LogicalChildren[i] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
if (renderer == null)
{
continue;
}
Rectangle bounds = child.Bounds;
Control control = renderer.GetNativeElement();
Rect childFinal = new Rect(bounds.X, bounds.Y, Math.Max(0, bounds.Width), Math.Max(0, bounds.Height));
control.Arrange(childFinal);
}
Element.IsInNativeLayout = false;
return(finalSize);
}
protected override System.Windows.Size MeasureOverride(System.Windows.Size availableSize)
{
if (Element == null || availableSize.Width * availableSize.Height == 0)
{
return(new System.Windows.Size(0, 0));
}
Element.IsInNativeLayout = true;
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
var child = ElementController.LogicalChildren[i] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
if (renderer == null)
{
continue;
}
FrameworkElement control = renderer.GetNativeElement();
if (control.ActualWidth != child.Width || control.ActualHeight != child.Height)
{
double width = child.Width <= -1 ? ActualWidth : child.Width;
double height = child.Height <= -1 ? ActualHeight : child.Height;
control.Measure(new System.Windows.Size(width, height));
}
}
System.Windows.Size result;
if (double.IsInfinity(availableSize.Width) || double.IsPositiveInfinity(availableSize.Height))
{
Size request = Element.Measure(availableSize.Width, availableSize.Height, MeasureFlags.IncludeMargins).Request;
result = new System.Windows.Size(request.Width, request.Height);
}
else
{
result = availableSize;
}
Element.IsInNativeLayout = false;
if (Double.IsPositiveInfinity(result.Height))
{
result.Height = 0.0;
}
if (Double.IsPositiveInfinity(result.Width))
{
result.Width = 0.0;
}
return(result);
}
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 void ArrangeSubviews()
{
Layout.IsInNativeLayout = true;
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
if (!(ElementController.LogicalChildren[i] is VisualElement child))
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
if (renderer == null)
{
continue;
}
Rectangle bounds = child.Bounds;
View nativeView = renderer.GetNativeElement();
// Set child size
var height = Convert.ToInt32(Math.Max(0, bounds.Height / SizeConverter));
if (height <= 0)
{
height = 1;
}
nativeView.Height = Dim.Sized(height);
var width = Convert.ToInt32(Math.Max(0, bounds.Width / SizeConverter));
if (width <= 0)
{
width = 1;
}
nativeView.Width = Dim.Sized(width);
// Set child position
int x = Convert.ToInt32(bounds.X / SizeConverter);
int y = Convert.ToInt32(bounds.Y / SizeConverter);
nativeView.X = Pos.At(x);
nativeView.Y = Pos.At(y);
}
Layout.IsInNativeLayout = false;
}
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);
}
private void LoadContent()
{
var currentView = Element.Content;
IVisualElementRenderer renderer = null;
if (currentView != null)
{
renderer = currentView.GetOrCreateRenderer();
}
if (renderer != null)
{
var content = renderer.GetNativeElement();
Control.Add(content);
}
}
void HandleChildAdded(object sender, ElementEventArgs e)
{
UiHelper.ExecuteInUiThread(() =>
{
var view = e.Element as VisualElement;
if (view == null)
{
return;
}
IVisualElementRenderer renderer = Platform.GetOrCreateRenderer(view);
Control.Children.Add(renderer.GetNativeElement());
if (_isZChanged)
{
EnsureZIndex();
}
});
}
protected override System.Windows.Size ArrangeOverride(System.Windows.Size finalSize)
{
if (Element == null)
{
return(finalSize);
}
Element.IsInNativeLayout = true;
var presentationSource = PresentationSource.FromVisual(this);
var stepX = presentationSource.CompositionTarget.TransformFromDevice.M11;
var stepY = presentationSource.CompositionTarget.TransformFromDevice.M22;
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
var child = ElementController.LogicalChildren[i] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
if (renderer == null)
{
continue;
}
Rectangle bounds = child.Bounds;
var control = renderer.GetNativeElement();
var width = Math.Max(0, bounds.Width);
var height = Math.Max(0, bounds.Height);
if (stepX != 1 && stepY != 1 && stepX != 0 && stepY != 0)
{
control.Width = width = Math.Ceiling(width / stepX) * stepX;
control.Height = height = Math.Ceiling(height / stepY) * stepY;
}
control.Arrange(new Rect(bounds.X, bounds.Y, width, height));
}
Element.IsInNativeLayout = false;
return(finalSize);
}
protected override global::Avalonia.Size ArrangeOverride(global::Avalonia.Size finalSize)
{
if (Element == null)
{
return(finalSize);
}
Element.IsInNativeLayout = true;
var stepX = 1;
var stepY = 1;
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
var child = ElementController.LogicalChildren[i] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
if (renderer == null)
{
continue;
}
Rectangle bounds = child.Bounds;
var control = renderer.GetNativeElement();
var width = Math.Max(bounds.Width, control.DesiredSize.Width);
var height = Math.Max(bounds.Height, control.DesiredSize.Height);
if (stepX != 1 && stepY != 1 && stepX != 0 && stepY != 0)
{
control.Width = width = Math.Ceiling(width / stepX) * stepX;
control.Height = height = Math.Ceiling(height / stepY) * stepY;
}
var childRect = new global::Avalonia.Rect(bounds.X, bounds.Y, width, height);
control.Arrange(childRect);
}
Element.IsInNativeLayout = false;
return(finalSize);
}
public static Control ToControl(this Page view)
{
if (!Forms.IsInitialized)
{
throw new InvalidOperationException("Call Forms.Init() before this");
}
if (!(view.RealParent is Application))
{
Application app = new DefaultApplication
{
MainPage = view
};
var formsApplicationPage = new FormsApplicationPage();
formsApplicationPage.LoadApplication(app);
var platform = new Platform(formsApplicationPage);
platform.SetPage(view);
}
IVisualElementRenderer renderer = Platform.GetOrCreateRenderer(view);
if (renderer == null)
{
throw new InvalidOperationException($"Could not find or create a renderer for {view}");
}
var Control = renderer.GetNativeElement();
Control.AttachedToLogicalTree += (sender, e) =>
{
view.Layout(new Rectangle(0, 0, Control.Bounds.Width, Control.Bounds.Height));
};
return(Control);
}
public static FrameworkElement ToFrameworkElement(this Page view)
{
if (!System.Maui.Maui.IsInitialized)
{
throw new InvalidOperationException("Call System.Maui.Maui.Init() before this");
}
if (!(view.RealParent is Application))
{
Application app = new DefaultApplication
{
MainPage = view
};
var formsApplicationPage = new FormsApplicationPage();
formsApplicationPage.LoadApplication(app);
var platform = new Platform(formsApplicationPage);
platform.SetPage(view);
}
IVisualElementRenderer renderer = Platform.GetOrCreateRenderer(view);
if (renderer == null)
{
throw new InvalidOperationException($"Could not find or create a renderer for {view}");
}
var frameworkElement = renderer.GetNativeElement();
frameworkElement.Loaded += (sender, args) =>
{
view.Layout(new Rectangle(0, 0, frameworkElement.ActualWidth, frameworkElement.ActualHeight));
};
return(frameworkElement);
}
protected override global::Avalonia.Size MeasureOverride(global::Avalonia.Size availableSize)
{
var baseDesiredSize = base.MeasureOverride(availableSize);
bool hasVisibleChild = false;
if (Element == null || availableSize.Width * availableSize.Height == 0)
{
return(new global::Avalonia.Size(0, 0));
}
Element.IsInNativeLayout = true;
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
var child = ElementController.LogicalChildren[i] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
if (renderer == null)
{
continue;
}
Control control = renderer.GetNativeElement();
bool isVisible = control.IsVisible;
if (isVisible && !hasVisibleChild)
{
hasVisibleChild = true;
}
var controlBounds = control.Bounds;
if (controlBounds.Width != child.Width || controlBounds.Height != child.Height)
{
double width = child.Width <= -1 ? availableSize.Width : child.Width;
double height = child.Height <= -1 ? availableSize.Height : child.Height;
control.Measure(new global::Avalonia.Size(width, height));
var childDesiredSize = control.DesiredSize;
}
}
global::Avalonia.Size result;
if (double.IsInfinity(availableSize.Width) || double.IsPositiveInfinity(availableSize.Height))
{
Size request = Element.Measure(availableSize.Width, availableSize.Height, MeasureFlags.IncludeMargins).Request;
result = new global::Avalonia.Size(request.Width, request.Height);
}
else
{
result = availableSize;
}
Element.IsInNativeLayout = false;
if (Double.IsPositiveInfinity(result.Height))
{
result = result.WithHeight(0.0);
}
if (Double.IsPositiveInfinity(result.Width))
{
result = result.WithWidth(0.0);
}
var finalDesiredSize = new global::Avalonia.Size(Math.Max(baseDesiredSize.Width, result.Width), Math.Max(baseDesiredSize.Height, result.Height));
return(result);
}