summaryrefslogtreecommitdiff
path: root/Xamarin.Forms.Platform.Android/PanGestureHandler.cs
blob: 0837f633be119c2b0847c17011d18dff4fd13b1e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
using System;
using Xamarin.Forms.Internals;

namespace Xamarin.Forms.Platform.Android
{
	internal class PanGestureHandler
	{
		readonly Func<double, double> _pixelTranslation;

		public PanGestureHandler(Func<View> getView, Func<double, double> pixelTranslation)
		{
			_pixelTranslation = pixelTranslation;
			GetView = getView;
		}

		Func<View> GetView { get; }

		public bool OnPan(float x, float y, int pointerCount)
		{
			View view = GetView();

			if (view == null)
				return false;

			var result = false;
			foreach (PanGestureRecognizer panGesture in
				view.GestureRecognizers.GetGesturesFor<PanGestureRecognizer>(g => g.TouchPoints == pointerCount))
			{
				((IPanGestureController)panGesture).SendPan(view, _pixelTranslation(x), _pixelTranslation(y), Application.Current.PanGestureId);
				result = true;
			}

			return result;
		}

		public bool OnPanComplete()
		{
			View view = GetView();

			if (view == null)
				return false;

			var result = false;
			foreach (PanGestureRecognizer panGesture in view.GestureRecognizers.GetGesturesFor<PanGestureRecognizer>())
			{
				((IPanGestureController)panGesture).SendPanCompleted(view, Application.Current.PanGestureId);
				result = true;
			}
			Application.Current.PanGestureId++;
			return result;
		}

		public bool OnPanStarted(int pointerCount)
		{
			View view = GetView();

			if (view == null)
				return false;

			var result = false;
			foreach (PanGestureRecognizer panGesture in
				view.GestureRecognizers.GetGesturesFor<PanGestureRecognizer>(g => g.TouchPoints == pointerCount))
			{
				((IPanGestureController)panGesture).SendPanStarted(view, Application.Current.PanGestureId);
				result = true;
			}
			return result;
		}
	}
}