annotate Implab.Fx/Animation.cs @ 96:daffa72a1cec v2

Added the chaining method to the non-generic IPromise
author cin
date Thu, 30 Oct 2014 10:06:16 +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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64
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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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96 }
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97 }