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using System.ComponentModel;
using Android.Support.V4.View;
using Android.Views;
namespace Xamarin.Forms.Platform.Android
{
public class CarouselPageRenderer : VisualElementRenderer<CarouselPage>
{
ViewPager _viewPager;
public CarouselPageRenderer()
{
AutoPackage = false;
}
protected override void Dispose(bool disposing)
{
if (disposing && _viewPager != null)
{
if (_viewPager.Adapter != null)
_viewPager.Adapter.Dispose();
_viewPager.Dispose();
_viewPager = null;
}
base.Dispose(disposing);
}
protected override void OnAttachedToWindow()
{
base.OnAttachedToWindow();
var adapter = new CarouselPageAdapter(_viewPager, Element, Context);
_viewPager.Adapter = adapter;
_viewPager.AddOnPageChangeListener(adapter);
adapter.UpdateCurrentItem();
Element.SendAppearing();
}
protected override void OnDetachedFromWindow()
{
base.OnDetachedFromWindow();
Element.SendDisappearing();
}
protected override void OnElementChanged(ElementChangedEventArgs<CarouselPage> e)
{
base.OnElementChanged(e);
if (_viewPager != null)
{
RemoveView(_viewPager);
_viewPager.ClearOnPageChangeListeners();
_viewPager.Dispose();
}
_viewPager = new ViewPager(Context);
AddView(_viewPager);
_viewPager.OffscreenPageLimit = int.MaxValue;
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == "CurrentPage" && Element.CurrentPage != null)
{
if (!Element.Batched)
UpdateCurrentItem();
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
base.OnLayout(changed, l, t, r, b);
if (_viewPager != null)
{
_viewPager.Measure(MeasureSpecFactory.MakeMeasureSpec(r - l, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(b - t, MeasureSpecMode.Exactly));
_viewPager.Layout(0, 0, r - l, b - t);
}
}
protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
_viewPager.Measure(widthMeasureSpec, heightMeasureSpec);
SetMeasuredDimension(_viewPager.MeasuredWidth, _viewPager.MeasuredHeight);
}
void UpdateCurrentItem()
{
int index = CarouselPage.GetIndex(Element.CurrentPage);
if (index < 0 || index >= Element.LogicalChildren.Count)
return;
_viewPager.CurrentItem = index;
}
}
}
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