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+//
+// Tweener.cs
+//
+// Author:
+// Jason Smith <jason.smith@xamarin.com>
+//
+// Copyright (c) 2012 Xamarin Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+
+namespace Xamarin.Forms
+{
+ internal class Tweener
+ {
+ long _lastMilliseconds;
+
+ int _timer;
+
+ public Tweener(uint length)
+ {
+ Value = 0.0f;
+ Length = length;
+ Loop = false;
+ }
+
+ public AnimatableKey Handle { get; set; }
+
+ public uint Length { get; }
+
+ public bool Loop { get; set; }
+
+ public double Value { get; private set; }
+
+ public event EventHandler Finished;
+
+ public void Pause()
+ {
+ if (_timer != 0)
+ {
+ Ticker.Default.Remove(_timer);
+ _timer = 0;
+ }
+ }
+
+ public void Start()
+ {
+ Pause();
+
+ _lastMilliseconds = 0;
+ _timer = Ticker.Default.Insert(step =>
+ {
+ long ms = step + _lastMilliseconds;
+
+ Value = Math.Min(1.0f, ms / (double)Length);
+
+ _lastMilliseconds = ms;
+
+ if (ValueUpdated != null)
+ ValueUpdated(this, EventArgs.Empty);
+
+ if (Value >= 1.0f)
+ {
+ if (Loop)
+ {
+ _lastMilliseconds = 0;
+ Value = 0.0f;
+ return true;
+ }
+
+ if (Finished != null)
+ Finished(this, EventArgs.Empty);
+ Value = 0.0f;
+ _timer = 0;
+ return false;
+ }
+ return true;
+ });
+ }
+
+ public void Stop()
+ {
+ Pause();
+ Value = 1.0f;
+ if (Finished != null)
+ Finished(this, EventArgs.Empty);
+ Value = 0.0f;
+ }
+
+ public event EventHandler ValueUpdated;
+
+ ~Tweener()
+ {
+ if (_timer != 0)
+ {
+ try
+ {
+ Ticker.Default.Remove(_timer);
+ }
+ catch (InvalidOperationException)
+ {
+ }
+ }
+ _timer = 0;
+ }
+ }
+} \ No newline at end of file