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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using AppKit;
using Foundation;
namespace Xamarin.Forms.Platform.MacOS
{
[Register("CarouselPageRenderer")]
public class CarouselPageRenderer : NSPageController, IVisualElementRenderer
{
bool _appeared;
bool _disposed;
EventTracker _events;
VisualElementTracker _tracker;
public CarouselPageRenderer()
{
View = new NSView
{
WantsLayer = true,
Layer = { BackgroundColor = NSColor.White.CGColor }
};
}
public CarouselPageRenderer(IntPtr handle) : base(handle)
{
}
IElementController ElementController => Element;
IPageController PageController => (IPageController)Element;
public override nint SelectedIndex
{
get { return base.SelectedIndex; }
set
{
if (base.SelectedIndex == value)
return;
base.SelectedIndex = value;
if (Carousel != null)
Carousel.CurrentPage = (ContentPage)ElementController.LogicalChildren[(int)SelectedIndex];
}
}
public VisualElement Element { get; private set; }
public event EventHandler<VisualElementChangedEventArgs> ElementChanged;
public SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
return NativeView.GetSizeRequest(widthConstraint, heightConstraint);
}
public NSView NativeView => View;
public void SetElement(VisualElement element)
{
VisualElement oldElement = Element;
Element = element;
Init();
OnElementChanged(new VisualElementChangedEventArgs(oldElement, element));
}
public void SetElementSize(Size size)
{
Element.Layout(new Rectangle(Element.X, Element.Y, size.Width, size.Height));
}
public NSViewController ViewController => this;
public override void ViewDidAppear()
{
base.ViewDidAppear();
if (_appeared || _disposed)
return;
_appeared = true;
PageController.SendAppearing();
}
public override void ViewDidDisappear()
{
base.ViewDidDisappear();
if (!_appeared || _disposed)
return;
_appeared = false;
PageController.SendDisappearing();
}
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;
PageController?.SendDisappearing();
}
if (_events != null)
{
_events.Dispose();
_events = null;
}
if (_tracker != null)
{
_tracker.Dispose();
_tracker = null;
}
Element = null;
_disposed = true;
}
base.Dispose(disposing);
}
void OnElementChanged(VisualElementChangedEventArgs e)
{
ElementChanged?.Invoke(this, e);
}
void ConfigureNSPageController()
{
TransitionStyle = NSPageControllerTransitionStyle.HorizontalStrip;
}
CarouselPage Carousel => Element as CarouselPage;
void Init()
{
Delegate = new PageControllerDelegate();
_tracker = new VisualElementTracker(this);
_events = new EventTracker(this);
_events.LoadEvents(View);
ConfigureNSPageController();
UpdateBackground();
UpdateSource();
Carousel.PropertyChanged += OnPropertyChanged;
Carousel.PagesChanged += OnPagesChanged;
}
void UpdateSource()
{
var pages = new List<NSPageContainer>();
for (var i = 0; i < ElementController.LogicalChildren.Count; i++)
{
Element element = ElementController.LogicalChildren[i];
var child = element as ContentPage;
if (child != null)
pages.Add(new NSPageContainer(child, i));
}
ArrangedObjects = pages.ToArray();
UpdateCurrentPage(false);
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
UpdateSource();
}
void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == nameof(TabbedPage.CurrentPage))
UpdateCurrentPage();
else if (e.PropertyName == VisualElement.BackgroundColorProperty.PropertyName)
UpdateBackground();
else if (e.PropertyName == Page.BackgroundImageProperty.PropertyName)
UpdateBackground();
}
void UpdateBackground()
{
if (View.Layer == null)
return;
string bgImage = ((Page)Element).BackgroundImage;
if (!string.IsNullOrEmpty(bgImage))
{
View.Layer.BackgroundColor = NSColor.FromPatternImage(NSImage.ImageNamed(bgImage)).CGColor;
return;
}
Color bgColor = Element.BackgroundColor;
View.Layer.BackgroundColor = bgColor.IsDefault ? NSColor.White.CGColor : bgColor.ToCGColor();
}
void UpdateCurrentPage(bool animated = true)
{
ContentPage current = Carousel.CurrentPage;
if (current != null)
{
int index = Carousel.CurrentPage != null ? CarouselPage.GetIndex(Carousel.CurrentPage) : 0;
if (index < 0)
index = 0;
if (SelectedIndex == index)
return;
if (animated)
NSAnimationContext.RunAnimation(context => { ((NSPageController)Animator).SelectedIndex = index; },
CompleteTransition);
else SelectedIndex = index;
}
}
}
}
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