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