annotate Implab.Fx/Animation.cs @ 209:a867536c68fc v2

Bound promise to CancellationToken Added new states to ExecutionSate enum. Added Safe.Guard() method to handle cleanup of the result of the promise
author cin
date Wed, 16 Nov 2016 03:06:08 +0300
parents dfa21d507bc5
children
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Timers;
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6 using System.ComponentModel;
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7 using System.Diagnostics;
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8
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9 namespace Implab.Fx
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10 {
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11 public delegate void AnimationStep<T>(T target, int elapsed, int duration);
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12
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13 public class Animation<TArg> where TArg: class
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14 {
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15 int m_duration;
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16 int m_delay;
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17 int m_elapsed;
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18 int m_prevTicks;
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19 TArg m_arg;
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20 ISynchronizeInvoke m_syncronizationObject;
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21
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22 public event AnimationStep<TArg> Step;
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23
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24 Promise<TArg> m_promise;
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25
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26 public Animation(TArg target, int duration, int delay)
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27 {
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28 if (duration <= 0)
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29 throw new ArgumentOutOfRangeException("duration");
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30 if (delay <= 0)
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31 throw new ArgumentOutOfRangeException("delay");
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32
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33 m_arg = target;
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34 m_syncronizationObject = target as ISynchronizeInvoke;
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35 m_duration = duration;
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36 m_delay = delay;
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37 m_promise = new Promise<TArg>();
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38 }
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39
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40 public Animation(TArg target)
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41 : this(target, 500, 30)
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42 {
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43 }
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44
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45 public TArg Traget
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46 {
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47 get { return m_arg; }
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48 }
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50 public Promise<TArg> Play()
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51 {
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52 var timer = new Timer(m_delay);
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53
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dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
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54 timer.AutoReset = false;
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55 timer.SynchronizingObject = m_syncronizationObject;
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56 timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);
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57
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58 m_prevTicks = Environment.TickCount;
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59
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60 timer.Start();
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61
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62 return m_promise;
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63 }
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65 void timer_Elapsed(object sender, ElapsedEventArgs args)
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66 {
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67 var timer = sender as Timer;
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68
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69 var dt = Environment.TickCount - m_prevTicks;
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70 m_prevTicks = Environment.TickCount;
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71
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72 m_elapsed += dt;
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74 if (m_elapsed > m_duration)
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75 m_elapsed = m_duration;
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76
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77 try
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78 {
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79 var handler = Step;
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80 if (handler != null)
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81 handler(m_arg, m_elapsed, m_duration);
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82 }
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83 catch (Exception e)
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84 {
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85 Trace.TraceError(e.ToString());
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86 }
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87
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88 if (m_elapsed < m_duration)
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89 timer.Start();
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90 else
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91 {
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92 timer.Dispose();
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93 m_promise.Resolve(m_arg);
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94 }
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95 }
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97 }