90 lines
2.9 KiB
C#
90 lines
2.9 KiB
C#
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// Copyright (c) Pixel Crushers. All rights reserved.
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using UnityEngine;
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namespace PixelCrushers.DialogueSystem
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{
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/// <summary>
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/// Lua expression changed delegate.
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/// </summary>
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public delegate void LuaChangedDelegate(LuaWatchItem luaWatchItem, Lua.Result newValue);
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/// <summary>
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/// Watch item for Lua observers. This allows the observer to be notified when a Lua value changes.
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/// </summary>
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public class LuaWatchItem
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{
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/// <summary>
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/// The lua expression to watch.
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/// </summary>
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public string luaExpression { get; set; }
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/// @cond FOR_V1_COMPATIBILITY
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public string LuaExpression { get { return luaExpression; } set { luaExpression = value; } }
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/// @endcond
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/// <summary>
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/// The current value of the expression.
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/// </summary>
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private string m_currentValue;
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/// <summary>
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/// Delegate to call when the expression changes.
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/// </summary>
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private event LuaChangedDelegate luaChanged;
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public static string LuaExpressionWithReturn(string luaExpression)
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{
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return luaExpression.StartsWith("return ") ? luaExpression : ("return " + luaExpression);
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="PixelCrushers.DialogueSystem.WatchItem"/> class.
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/// </summary>
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/// <param name='luaExpression'>
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/// Lua expression to watch.
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/// </param>
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/// <param name='luaChangedHandler'>
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/// Delegate to call when the expression changes.
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/// </param>
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public LuaWatchItem(string luaExpression, LuaChangedDelegate luaChangedHandler)
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{
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this.luaExpression = LuaExpressionWithReturn(luaExpression);
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this.m_currentValue = Lua.Run(this.luaExpression).asString;
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this.luaChanged = luaChangedHandler;
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}
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/// <summary>
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/// Checks if the watch item matches a specified luaExpression and luaChangedHandler.
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/// </summary>
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/// <param name='luaExpression'>
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/// The lua expression.
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/// </param>
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/// <param name='luaChangedHandler'>
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/// The notification delegate.
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/// </param>
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public bool Matches(string luaExpression, LuaChangedDelegate luaChangedHandler)
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{
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return (luaChangedHandler == luaChanged) && string.Equals(luaExpression, this.luaExpression);
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}
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/// <summary>
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/// Checks the watch item and calls the delegate if the Lua expression changed.
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/// </summary>
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public void Check()
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{
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Lua.Result result = Lua.Run(luaExpression);
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string newValue = result.asString;
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if (!string.Equals(m_currentValue, newValue))
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{
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m_currentValue = newValue;
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if (luaChanged != null) luaChanged(this, result);
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}
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}
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}
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}
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