From e872cdf4ce49cfd6851ed74d164e19e62afe1077 Mon Sep 17 00:00:00 2001
From: SungHyun Min <shyun.min@samsung.com>
Date: Wed, 22 Feb 2017 19:49:54 +0900
Subject: Refactoring GestureHandler for extension

 - Design : http://suprem.sec.samsung.net/confluence/display/SPTDTLC/Refactoring+GestureHandler

Change-Id: I1cbcf830b4b1076c227b0ea641508198c7cb2102
Signed-off-by: SungHyun Min <shyun.min@samsung.com>
---
 .../PinchGestureHandler.cs                         | 60 ++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Xamarin.Forms.Platform.Tizen/PinchGestureHandler.cs

(limited to 'Xamarin.Forms.Platform.Tizen/PinchGestureHandler.cs')

diff --git a/Xamarin.Forms.Platform.Tizen/PinchGestureHandler.cs b/Xamarin.Forms.Platform.Tizen/PinchGestureHandler.cs
new file mode 100644
index 00000000..c22b7e20
--- /dev/null
+++ b/Xamarin.Forms.Platform.Tizen/PinchGestureHandler.cs
@@ -0,0 +1,60 @@
+using System;
+using System.ComponentModel;
+using ElmSharp;
+
+namespace Xamarin.Forms.Platform.Tizen
+{
+	public class PinchGestureHandler : GestureHandler
+	{
+		Point _currentScalePoint;
+		int _previousPinchRadius;
+		double _originalPinchScale;
+
+		public PinchGestureHandler(IGestureRecognizer recognizer) : base(recognizer)
+		{
+		}
+
+		public override GestureLayer.GestureType Type
+		{
+			get
+			{
+				return GestureLayer.GestureType.Zoom;
+			}
+		}
+
+		public override event PropertyChangedEventHandler PropertyChanged;
+
+		protected override void OnStarted(View sender, object data)
+		{
+			var geometry = Platform.GetRenderer(sender).NativeView.Geometry;
+			var zoomData = (GestureLayer.ZoomData)data;
+			_currentScalePoint = new Point((zoomData.X - geometry.X) / (double)geometry.Width, (zoomData.Y - geometry.Y) / (double)geometry.Height);
+			_originalPinchScale = sender.Scale;
+			_previousPinchRadius = zoomData.Radius;
+			(Recognizer as IPinchGestureController)?.SendPinchStarted(sender, _currentScalePoint);
+		}
+
+		protected override void OnMoved(View sender, object data)
+		{
+			var zoomData = (GestureLayer.ZoomData)data;
+			if (_previousPinchRadius <= 0)
+				_previousPinchRadius = 1;
+			// functionality limitation: _currentScalePoint is not updated
+			(Recognizer as IPinchGestureController)?.SendPinch(sender,
+				1 + _originalPinchScale * (zoomData.Radius - _previousPinchRadius) / _previousPinchRadius,
+				_currentScalePoint
+			);
+			_previousPinchRadius = zoomData.Radius;
+		}
+
+		protected override void OnCompleted(View sender, object data)
+		{
+			(Recognizer as IPinchGestureController)?.SendPinchEnded(sender);
+		}
+
+		protected override void OnCanceled(View sender, object data)
+		{
+			(Recognizer as IPinchGestureController)?.SendPinchCanceled(sender);
+		}
+	}
+}
\ No newline at end of file
-- 
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