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-rw-r--r--Xamarin.Forms.Platform.Android/AppCompat/CarouselPageRenderer.cs155
1 files changed, 155 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.Android/AppCompat/CarouselPageRenderer.cs b/Xamarin.Forms.Platform.Android/AppCompat/CarouselPageRenderer.cs
new file mode 100644
index 00000000..5e8a1b8a
--- /dev/null
+++ b/Xamarin.Forms.Platform.Android/AppCompat/CarouselPageRenderer.cs
@@ -0,0 +1,155 @@
+using System.Collections.Specialized;
+using System.ComponentModel;
+using Android.Content;
+using Android.Support.V4.View;
+using Android.Views;
+
+namespace Xamarin.Forms.Platform.Android.AppCompat
+{
+ public class CarouselPageRenderer : VisualElementRenderer<CarouselPage>, ViewPager.IOnPageChangeListener
+ {
+ bool _disposed;
+ FormsViewPager _viewPager;
+
+ public CarouselPageRenderer()
+ {
+ AutoPackage = false;
+ }
+
+ void ViewPager.IOnPageChangeListener.OnPageScrolled(int position, float positionOffset, int positionOffsetPixels)
+ {
+ }
+
+ void ViewPager.IOnPageChangeListener.OnPageScrollStateChanged(int state)
+ {
+ }
+
+ void ViewPager.IOnPageChangeListener.OnPageSelected(int position)
+ {
+ Element.CurrentPage = Element.Children[position];
+ }
+
+ protected override void Dispose(bool disposing)
+ {
+ if (disposing && !_disposed)
+ {
+ _disposed = true;
+ RemoveAllViews();
+ foreach (ContentPage pageToRemove in Element.Children)
+ {
+ IVisualElementRenderer pageRenderer = Android.Platform.GetRenderer(pageToRemove);
+ if (pageRenderer != null)
+ {
+ pageRenderer.ViewGroup.RemoveFromParent();
+ pageRenderer.Dispose();
+ }
+ pageToRemove.ClearValue(Android.Platform.RendererProperty);
+ }
+
+ if (_viewPager != null)
+ {
+ _viewPager.Adapter.Dispose();
+ _viewPager.Dispose();
+ _viewPager = null;
+ }
+
+ if (Element != null)
+ Element.InternalChildren.CollectionChanged -= OnChildrenCollectionChanged;
+ }
+
+ base.Dispose(disposing);
+ }
+
+ protected override void OnAttachedToWindow()
+ {
+ base.OnAttachedToWindow();
+ Element.SendAppearing();
+ }
+
+ protected override void OnDetachedFromWindow()
+ {
+ base.OnDetachedFromWindow();
+ Element.SendDisappearing();
+ }
+
+ protected override void OnElementChanged(ElementChangedEventArgs<CarouselPage> e)
+ {
+ base.OnElementChanged(e);
+
+ var activity = (FormsAppCompatActivity)Context;
+
+ if (e.OldElement != null)
+ e.OldElement.InternalChildren.CollectionChanged -= OnChildrenCollectionChanged;
+
+ if (e.NewElement != null)
+ {
+ FormsViewPager pager =
+ _viewPager =
+ new FormsViewPager(activity)
+ {
+ OverScrollMode = OverScrollMode.Never,
+ EnableGesture = true,
+ LayoutParameters = new LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent),
+ Adapter = new FormsFragmentPagerAdapter<ContentPage>(e.NewElement, activity.SupportFragmentManager) { CountOverride = e.NewElement.Children.Count }
+ };
+ pager.Id = FormsAppCompatActivity.GetUniqueId();
+ pager.AddOnPageChangeListener(this);
+
+ AddView(pager);
+ CarouselPage carouselPage = e.NewElement;
+ if (carouselPage.CurrentPage != null)
+ ScrollToCurrentPage();
+
+ UpdateIgnoreContainerAreas();
+ carouselPage.InternalChildren.CollectionChanged += OnChildrenCollectionChanged;
+ }
+ }
+
+ protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+ {
+ base.OnElementPropertyChanged(sender, e);
+
+ if (e.PropertyName == "CurrentPage")
+ ScrollToCurrentPage();
+ }
+
+ protected override void OnLayout(bool changed, int l, int t, int r, int b)
+ {
+ FormsViewPager pager = _viewPager;
+ Context context = Context;
+ int width = r - l;
+ int height = b - t;
+
+ pager.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.AtMost), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
+
+ if (width > 0 && height > 0)
+ {
+ Element.ContainerArea = new Rectangle(0, 0, context.FromPixels(width), context.FromPixels(height));
+ pager.Layout(0, 0, width, b);
+ }
+
+ base.OnLayout(changed, l, t, r, b);
+ }
+
+ void OnChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+ {
+ FormsViewPager pager = _viewPager;
+
+ ((FormsFragmentPagerAdapter<ContentPage>)pager.Adapter).CountOverride = Element.Children.Count;
+ pager.Adapter.NotifyDataSetChanged();
+
+ UpdateIgnoreContainerAreas();
+ }
+
+ void ScrollToCurrentPage()
+ {
+ _viewPager.SetCurrentItem(Element.Children.IndexOf(Element.CurrentPage), true);
+ }
+
+ void UpdateIgnoreContainerAreas()
+ {
+ foreach (ContentPage child in Element.Children)
+ child.IgnoresContainerArea = child is NavigationPage;
+ }
+ }
+} \ No newline at end of file