85 lines
2.9 KiB
C#
85 lines
2.9 KiB
C#
using System.ComponentModel;
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using Android.Content;
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using Android.Graphics;
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using Android.Views;
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using Gallery.Droid.Renderers;
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using Gallery.UI;
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using Xamarin.Forms;
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using Xamarin.Forms.Platform.Android;
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[assembly: ExportRenderer(typeof(CardView), typeof(CardViewRenderer))]
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namespace Gallery.Droid.Renderers
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{
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public class CardViewRenderer : VisualElementRenderer<CardView>
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{
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public CardViewRenderer(Context context) : base(context)
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{
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}
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protected override void OnElementChanged(ElementChangedEventArgs<CardView> e)
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{
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base.OnElementChanged(e);
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var element = e.NewElement;
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if (element != null)
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{
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var radius = element.CornerRadius;
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if (radius > 0)
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{
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var density = Resources.DisplayMetrics.Density;
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OutlineProvider = new CornerRadiusOutlineProvider(element, radius, density);
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ClipToOutline = true;
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//var drawable = new RoundCornerDrawable(radius * density);
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//drawable.SetColorFilter(element.BackgroundColor.ToAndroid(), PorterDuff.Mode.Src);
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//((Android.Views.View)this).SetBackground(drawable);
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Elevation = (float)(element.ShadowOffset.Height + 2) * density;
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}
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}
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}
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protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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base.OnElementPropertyChanged(sender, e);
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var element = Element;
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if (element == null)
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{
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return;
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}
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switch (e.PropertyName)
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{
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case nameof(CardView.ShadowOffset):
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var density = Resources.DisplayMetrics.Density;
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Elevation = (float)(element.ShadowOffset.Height + 2) * density;
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break;
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}
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}
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class CornerRadiusOutlineProvider : ViewOutlineProvider
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{
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readonly Element element;
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readonly float radius;
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readonly float density;
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public CornerRadiusOutlineProvider(Element formsElement, float radius, float density)
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{
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element = formsElement;
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this.radius = radius * density;
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this.density = density;
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}
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public override void GetOutline(Android.Views.View view, Outline outline)
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{
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float scale = density;
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double width = (double)element.GetValue(VisualElement.WidthProperty) * scale;
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double height = (double)element.GetValue(VisualElement.HeightProperty) * scale;
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var rect = new Android.Graphics.Rect(0, 0, (int)width, (int)height);
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outline.SetRoundRect(rect, radius);
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}
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}
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}
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}
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