//----------------------------------------------
// NGUI: Next-Gen UI kit
// Copyright © 2011-2013 Tasharen Entertainment
//----------------------------------------------
//#if UNITY_EDITOR || !UNITY_FLASH
//#define REFLECTION_SUPPORT
//#endif
//#if REFLECTION_SUPPORT
using System.Reflection;
//#endif
using System.Collections.Generic;
using UnityEngine;
/// <summary>
/// Delegate callback that Unity can serialize and set via Inspector.
/// </summary>
[System.Serializable]
public class EventDelegate
{
[SerializeField] MonoBehaviour mTarget;
[SerializeField] string mMethodName;
/// <summary>
/// Whether the event delegate will be removed after execution.
/// </summary>
public bool oneShot = false;
public delegate void Callback();
Callback mCachedCallback;
bool mRawDelegate = false;
/// <summary>
/// Event delegate's target object.
/// </summary>
public MonoBehaviour target { get { return mTarget; } set { mTarget = value; mCachedCallback = null; mRawDelegate = false; } }
/// <summary>
/// Event delegate's method name.
/// </summary>
public string methodName { get { return mMethodName; } set { mMethodName = value; mCachedCallback = null; mRawDelegate = false; } }
/// <summary>
/// Whether this delegate's values have been set.
/// </summary>
public bool isValid { get { return (mRawDelegate && mCachedCallback != null) || (mTarget != null && !string.IsNullOrEmpty(mMethodName)); } }
/// <summary>
/// Whether the target script is actually enabled.
/// </summary>
public bool isEnabled { get { return (mRawDelegate && mCachedCallback != null) || (mTarget != null && mTarget.enabled); } }
public EventDelegate () { }
public EventDelegate (Callback call) { Set(call); }
public EventDelegate (MonoBehaviour target, string methodName) { Set(target, methodName); }
/// <summary>
/// Windows 8 is retarded.
/// </summary>
#if !UNITY_EDITOR && UNITY_WP8
static string GetMethodName (Callback callback)
{
System.Delegate d = callback as System.Delegate;
return d.Method.Name;
}
static bool IsValid (Callback callback)
{
System.Delegate d = callback as System.Delegate;
return d != null && d.Method != null;
}
//#elif !UNITY_EDITOR && UNITY_METRO
#elif NETFX_CORE
static string GetMethodName (Callback callback)
{
System.Delegate d = callback as System.Delegate;
return d.GetMethodInfo().Name;
}
static bool IsValid (Callback callback)
{
System.Delegate d = callback as System.Delegate;
return d != null && d.GetMethodInfo() != null;
}
//#elif REFLECTION_SUPPORT
// static string GetMethodName (Callback callback) { return callback.Method.Name; }
// static bool IsValid (Callback callback) { return callback != null && callback.Method != null; }
#else
static bool IsValid (Callback callback) { return callback != null; }
#endif
/// <summary>
/// Equality operator.
/// </summary>
public override bool Equals (object obj)
{
if (obj == null)
{
return !isValid;
}
{
Callback callback = obj as Callback;
//#if REFLECTION_SUPPORT
// if (callback.Equals(mCachedCallback)) return true;
// return (mTarget == callback.Target && string.Equals(mMethodName, GetMethodName(callback)));
//#elif UNITY_FLASH
#if UNITY_FLASH
return (callback == mCachedCallback);
#else
return callback.Equals(mCachedCallback);
#endif
}
if (obj
is EventDelegate
) {
EventDelegate del = obj as EventDelegate;
return (mTarget == del.mTarget && string.Equals(mMethodName, del.mMethodName));
}
return false;
}
static int s_Hash = "EventDelegate".GetHashCode();
/// <summary>
/// Used in equality operators.
/// </summary>
public override int GetHashCode () { return s_Hash; }
/// <summary>
/// Convert the saved target and method name into an actual delegate.
/// </summary>
Callback Get ()
{
//#if REFLECTION_SUPPORT
// if (!mRawDelegate && (mCachedCallback == null || mCachedCallback.Target != mTarget || GetMethodName(mCachedCallback) != mMethodName))
// {
// if (mTarget != null && !string.IsNullOrEmpty(mMethodName))
// {
// mCachedCallback = (Callback)System.Delegate.CreateDelegate(typeof(Callback), mTarget, mMethodName);
// }
// else return null;
// }
//#endif
return mCachedCallback;
}
/// <summary>
/// Set the delegate callback directly.
/// </summary>
void Set (Callback call)
{
if (call == null || !IsValid(call))
{
mTarget = null;
mMethodName = null;
mCachedCallback = null;
mRawDelegate = false;
}
else
{
//#if REFLECTION_SUPPORT
// mTarget = call.Target as MonoBehaviour;
// if (mTarget == null)
// {
// mRawDelegate = true;
// mCachedCallback = call;
// mMethodName = null;
// }
// else
// {
// mMethodName = GetMethodName(call);
// mRawDelegate = false;
// }
//#else
mRawDelegate = true;
mCachedCallback = call;
mMethodName = null;
mTarget = null;
//#endif
}
}
/// <summary>
/// Set the delegate callback using the target and method names.
/// </summary>
public void Set (MonoBehaviour target, string methodName)
{
this.mTarget = target;
this.mMethodName = methodName;
mCachedCallback = null;
mRawDelegate = false;
}
/// <summary>
/// Execute the delegate, if possible.
/// This will only be used when the application is playing in order to prevent unintentional state changes.
/// </summary>
public bool Execute ()
{
#if UNITY_EDITOR
if (Application.isPlaying)
#endif
{
Callback call = Get();
if (call != null)
{
call();
return true;
}
//#if !REFLECTION_SUPPORT
// if (isValid)
// {
// mTarget.SendMessage(mMethodName, SendMessageOptions.DontRequireReceiver);
// return true;
// }
//#endif
}
return false;
}
/// <summary>
/// Clear the event delegate.
/// </summary>
public void Clear ()
{
mTarget = null;
mMethodName = null;
mRawDelegate = false;
mCachedCallback = null;
}
/// <summary>
/// Convert the delegate to its string representation.
/// </summary>
public override string ToString ()
{
if (mTarget != null)
{
string typeName = mTarget.GetType().ToString();
int period = typeName.LastIndexOf('.');
if (period > 0) typeName = typeName.Substring(period + 1);
if (!string.IsNullOrEmpty(methodName)) return typeName + "." + methodName;
else return typeName + ".[delegate]";
}
return mRawDelegate ? "[delegate]" : null;
}
/// <summary>
/// Execute an entire list of delegates.
/// </summary>
static public void Execute (List<EventDelegate> list)
{
if (list != null)
{
for (int i = 0; i < list.Count; )
{
EventDelegate del = list[i];
if (del != null)
{
del.Execute();
if (del.oneShot)
{
list.RemoveAt(i);
continue;
}
}
++i;
}
}
}
/// <summary>
/// Convenience function to check if the specified list of delegates can be executed.
/// </summary>
static public bool IsValid (List<EventDelegate> list)
{
if (list != null)
{
for (int i = 0, imax = list.Count; i < imax; ++i)
{
EventDelegate del = list[i];
if (del != null && del.isValid)
return true;
}
}
return false;
}
/// <summary>
/// Assign a new event delegate.
/// </summary>
static public void Set (List<EventDelegate> list, Callback callback)
{
if (list != null)
{
list.Clear();
list
.Add(new EventDelegate
(callback
)); }
}
/// <summary>
/// Append a new event delegate to the list.
/// </summary>
static public void Add (List<EventDelegate> list, Callback callback) { Add(list, callback, false); }
/// <summary>
/// Append a new event delegate to the list.
/// </summary>
static public void Add (List<EventDelegate> list, Callback callback, bool oneShot)
{
if (list != null)
{
for (int i = 0, imax = list.Count; i < imax; ++i)
{
EventDelegate del = list[i];
if (del != null && del.Equals(callback))
return;
}
EventDelegate ed
= new EventDelegate
(callback
); ed.oneShot = oneShot;
list.Add(ed);
}
else
{
Debug.LogWarning("Attempting to add a callback to a list that's null");
}
}
/// <summary>
/// Append a new event delegate to the list.
/// </summary>
static public void Add (List<EventDelegate> list, EventDelegate ev) { Add(list, ev, false); }
/// <summary>
/// Append a new event delegate to the list.
/// </summary>
static public void Add (List<EventDelegate> list, EventDelegate ev, bool oneShot)
{
if (list != null)
{
for (int i = 0, imax = list.Count; i < imax; ++i)
{
EventDelegate del = list[i];
if (del != null && del.Equals(ev))
return;
}
EventDelegate ed
= new EventDelegate
(ev
.target, ev
.methodName); ed.oneShot = oneShot;
list.Add(ed);
}
else
{
Debug.LogWarning("Attempting to add a callback to a list that's null");
}
}
/// <summary>
/// Remove an existing event delegate from the list.
/// </summary>
static public bool Remove (List<EventDelegate> list, Callback callback)
{
if (list != null)
{
for (int i = 0, imax = list.Count; i < imax; ++i)
{
EventDelegate del = list[i];
if (del != null && del.Equals(callback))
{
list.RemoveAt(i);
return true;
}
}
}
return false;
}
}
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