1 files changed, 138 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.Android/Renderers/MasterDetailContainer.cs b/Xamarin.Forms.Platform.Android/Renderers/MasterDetailContainer.cs
new file mode 100644
index 00000000..6f92d90f
--- /dev/null
+++ b/Xamarin.Forms.Platform.Android/Renderers/MasterDetailContainer.cs
@@ -0,0 +1,138 @@
+using Android.Content;
+using Android.Content.Res;
+using Android.Views;
+
+namespace Xamarin.Forms.Platform.Android
+{
+	internal class MasterDetailContainer : ViewGroup
+	{
+		const int DefaultMasterSize = 320;
+		const int DefaultSmallMasterSize = 240;
+		readonly bool _isMaster;
+		readonly MasterDetailPage _parent;
+		VisualElement _childView;
+
+		public MasterDetailContainer(MasterDetailPage parent, bool isMaster, Context context) : base(context)
+		{
+			_parent = parent;
+			_isMaster = isMaster;
+		}
+
+		public VisualElement ChildView
+		{
+			get { return _childView; }
+			set
+			{
+				if (_childView == value)
+					return;
+
+				RemoveAllViews();
+				if (_childView != null)
+					DisposeChildRenderers();
+
+				_childView = value;
+
+				if (_childView == null)
+					return;
+
+				IVisualElementRenderer renderer = Platform.GetRenderer(_childView);
+				if (renderer == null)
+					Platform.SetRenderer(_childView, renderer = Platform.CreateRenderer(_childView));
+
+				if (renderer.ViewGroup.Parent != this)
+				{
+					if (renderer.ViewGroup.Parent != null)
+						renderer.ViewGroup.RemoveFromParent();
+					SetDefaultBackgroundColor(renderer);
+					AddView(renderer.ViewGroup);
+					renderer.UpdateLayout();
+				}
+			}
+		}
+
+		public int TopPadding { get; set; }
+
+		double DefaultWidthMaster
+		{
+			get
+			{
+				double w = Context.FromPixels(Resources.DisplayMetrics.WidthPixels);
+				return w < DefaultSmallMasterSize ? w : (w < DefaultMasterSize ? DefaultSmallMasterSize : DefaultMasterSize);
+			}
+		}
+
+		public override bool OnInterceptTouchEvent(MotionEvent ev)
+		{
+			bool isShowingPopover = _parent.IsPresented && !_parent.ShouldShowSplitMode;
+			if (!_isMaster && isShowingPopover)
+				return true;
+			return base.OnInterceptTouchEvent(ev);
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing)
+			{
+				RemoveAllViews();
+				DisposeChildRenderers();
+			}
+			base.Dispose(disposing);
+		}
+
+		protected override void OnLayout(bool changed, int l, int t, int r, int b)
+		{
+			if (_childView == null)
+				return;
+
+			Rectangle bounds = GetBounds(_isMaster, l, t, r, b);
+			if (_isMaster)
+				_parent.MasterBounds = bounds;
+			else
+				_parent.DetailBounds = bounds;
+
+			IVisualElementRenderer renderer = Platform.GetRenderer(_childView);
+			renderer.UpdateLayout();
+		}
+
+		void DisposeChildRenderers()
+		{
+			IVisualElementRenderer childRenderer = Platform.GetRenderer(_childView);
+			if (childRenderer != null)
+				childRenderer.Dispose();
+			_childView.ClearValue(Platform.RendererProperty);
+		}
+
+		Rectangle GetBounds(bool isMasterPage, int left, int top, int right, int bottom)
+		{
+			double width = Context.FromPixels(right - left);
+			double height = Context.FromPixels(bottom - top);
+			double xPos = 0;
+
+			//splitview
+			if (_parent.ShouldShowSplitMode)
+			{
+				//to keep some behavior we have on iPad where you can toggle and it won't do anything 
+				bool isDefaultNoToggle = _parent.MasterBehavior == MasterBehavior.Default;
+				xPos = isMasterPage ? 0 : (_parent.IsPresented || isDefaultNoToggle ? DefaultWidthMaster : 0);
+				width = isMasterPage ? DefaultWidthMaster : _parent.IsPresented || isDefaultNoToggle ? width - DefaultWidthMaster : width;
+			}
+			else
+			{
+				//popover make the master smaller
+				width = isMasterPage && (Device.Info.CurrentOrientation.IsLandscape() || Device.Idiom == TargetIdiom.Tablet) ? DefaultWidthMaster : width;
+			}
+
+			double padding = Context.FromPixels(TopPadding);
+			return new Rectangle(xPos, padding, width, height - padding);
+		}
+
+		void SetDefaultBackgroundColor(IVisualElementRenderer renderer)
+		{
+			if (ChildView.BackgroundColor == Color.Default)
+			{
+				TypedArray colors = Context.Theme.ObtainStyledAttributes(new[] { global::Android.Resource.Attribute.ColorBackground });
+				renderer.ViewGroup.SetBackgroundColor(new global::Android.Graphics.Color(colors.GetColor(0, 0)));
+			}
+		}
+	}
+}
\ No newline at end of file