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annotate Orchestland/Assets/LeapMotion/Widgets/Scripts/Interfaces/DataBinder.cs @ 1:f7675884f2a1

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Add Orchestland project
author Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2015 23:09:20 +0900
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1 using UnityEngine;
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2 using System;
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3 using System.Collections.Generic;
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4
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5 namespace LMWidgets {
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6
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7 // Interface to define an object that can be a data provider to a widget.
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8 public abstract class DataBinder<WidgetType, PayloadType> : MonoBehaviour where WidgetType : IDataBoundWidget<WidgetType, PayloadType> {
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9 [SerializeField]
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10 private List<WidgetType> m_widgets;
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11
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12 private PayloadType m_lastDataValue;
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13
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14 // Fires when the data is updated with the most recent data as the payload
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15 public event EventHandler<EventArg<PayloadType>> DataChangedHandler;
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16
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17 /// <summary>
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18 /// Returns the current system value of the data.
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19 /// </summary>
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20 /// <remarks>
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21 /// In the default implementation of the data-binder this is called every frame (in Update) so it's best to keep
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22 /// this implementation light weight.
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23 /// </remarks>
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24 abstract public PayloadType GetCurrentData();
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25
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26 /// <summary>
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27 /// Set the current system value of the data.
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28 /// </summary>
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29 abstract protected void setDataModel(PayloadType value);
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30
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31 // Directly set the current value of the data-model and send out the relevant updates.
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32 public void SetCurrentData(PayloadType value) {
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33 setDataModel (value);
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34 updateLinkedWidgets ();
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35 fireDataChangedEvent (GetCurrentData ());
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36 m_lastDataValue = GetCurrentData ();
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37 }
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38
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39 // Itterate through the linked widgets and update their values.
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40 private void updateLinkedWidgets() {
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41 foreach(WidgetType widget in m_widgets) {
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42 widget.SetWidgetValue(GetCurrentData());
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43 }
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44 }
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45
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46 // Register all assigned widgets with the data-binder.
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47 virtual protected void Awake() {
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48 foreach (WidgetType widget in m_widgets) {
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49 widget.RegisterDataBinder(this);
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50 }
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51 }
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52
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53 // Grab the inital value for GetCurrentData
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54 virtual protected void Start() {
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55 m_lastDataValue = GetCurrentData();
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56 }
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57
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58 // Checks for change in data.
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59 // We need this in addition to SetCurrentData as the data we're linked to
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60 // could be modified by an external source.
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61 void Update() {
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62 PayloadType currentData = GetCurrentData();
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63 if (!compare (m_lastDataValue, currentData)) {
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64 updateLinkedWidgets ();
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65 fireDataChangedEvent (currentData);
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66 }
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67 m_lastDataValue = currentData;
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68 }
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69
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70 // Fire the data changed event.
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71 // Wrapping this in a function allows child classes to call it and fire the event.
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72 protected void fireDataChangedEvent(PayloadType currentData) {
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73 EventHandler<EventArg<PayloadType>> handler = DataChangedHandler;
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74 if ( handler != null ) { handler(this, new EventArg<PayloadType>(currentData)); }
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75 }
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76
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77 // Handles proper comparison of generic types.
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78 private bool compare(PayloadType x, PayloadType y)
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79 {
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80 return EqualityComparer<PayloadType>.Default.Equals(x, y);
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81 }
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82 }
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83
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84 public abstract class DataBinderSlider : DataBinder<SliderBase, float> {};
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85 public abstract class DataBinderToggle : DataBinder<ButtonToggleBase, bool> {};
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86 public abstract class DataBinderDial : DataBinder<DialGraphics, string> {};
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87 }