//----------------------------------------------
//            NGUI: Next-Gen UI kit
// Copyright © 2011-2015 Tasharen Entertainment
//----------------------------------------------

using UnityEngine;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;

/// <summary>
/// Helper class containing generic functions used throughout the UI library.
/// </summary>

static public class NGUITools
{
	static AudioListener mListener;

	static bool mLoaded = false;
	static float mGlobalVolume = 1f;

	/// <summary>
	/// Globally accessible volume affecting all sounds played via NGUITools.PlaySound().
	/// </summary>

	static public float soundVolume {
		get {
			if (!mLoaded) {
				mLoaded = true;
				mGlobalVolume = PlayerPrefs.GetFloat ("Sound", 1f);
			}
			return mGlobalVolume;
		}
		set {
			if (mGlobalVolume != value) {
				mLoaded = true;
				mGlobalVolume = value;
				PlayerPrefs.SetFloat ("Sound", value);
			}
		}
	}

	/// <summary>
	/// Helper function -- whether the disk access is allowed.
	/// </summary>

	static public bool fileAccess {
		get {
			#if UNITY_2017_1_OR_NEWER
			return Application.platform != RuntimePlatform.WebGLPlayer;
			#else
			return Application.platform != RuntimePlatform.WindowsWebPlayer &&
			Application.platform != RuntimePlatform.OSXWebPlayer;
			#endif
		}
	}

	/// <summary>
	/// Play the specified audio clip.
	/// </summary>

	static public AudioSource PlaySound (AudioClip clip)
	{
		return PlaySound (clip, 1f, 1f);
	}

	/// <summary>
	/// Play the specified audio clip with the specified volume.
	/// </summary>

	static public AudioSource PlaySound (AudioClip clip, float volume)
	{
		return PlaySound (clip, volume, 1f);
	}

	static float mLastTimestamp = 0f;
	static AudioClip mLastClip;

	/// <summary>
	/// Play the specified audio clip with the specified volume and pitch.
	/// </summary>

	static public AudioSource PlaySound (AudioClip clip, float volume, float pitch)
	{
		if (!Coolape.SoundEx.soundEffectSwitch)
			return null; // add by chenbin
		float time = Time.time;
		if (mLastClip == clip && mLastTimestamp + 0.1f > time)
			return null;

		mLastClip = clip;
		mLastTimestamp = time;
		volume *= soundVolume;
		try{
		if (clip != null && volume > 0.01f) {
			if (mListener == null || !NGUITools.GetActive (mListener)) {
				AudioListener[] listeners = GameObject.FindObjectsOfType (typeof(AudioListener)) as AudioListener[];

				if (listeners != null) {
					for (int i = 0; i < listeners.Length; ++i) {
						if (NGUITools.GetActive (listeners [i])) {
							mListener = listeners [i];
							break;
						}
					}
				}

				if (mListener == null) {
					Camera cam = Camera.main;
					if (cam == null)
						cam = GameObject.FindObjectOfType (typeof(Camera)) as Camera;
					if (cam != null)
						mListener = cam.gameObject.AddComponent<AudioListener> ();
				}
			}

			if (mListener != null && mListener.enabled && NGUITools.GetActive (mListener.gameObject)) {
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
				AudioSource source = mListener.audio;
#else
				AudioSource source = mListener.GetComponent<AudioSource> ();
#endif
				if (source == null)
					source = mListener.gameObject.AddComponent<AudioSource> ();
#if !UNITY_FLASH
				source.priority = 50;
				source.pitch = pitch;
#endif
				source.PlayOneShot (clip, volume);
				return source;
			}
		}
		} catch (System.Exception e) {
			#if UNITY_EDITOR
			Debug.LogError (e);
			#endif
		}
		return null;
	}

	/// <summary>
	/// New WWW call can fail if the crossdomain policy doesn't check out. Exceptions suck. It's much more elegant to check for null instead.
	/// </summary>

	//    static public WWW OpenURL (string url)
	//    {
	//#if UNITY_FLASH
	//        Debug.LogError("WWW is not yet implemented in Flash");
	//        return null;
	//#else
	//        WWW www = null;
	//        try { www = new WWW(url); }
	//        catch (System.Exception ex) { Debug.LogError(ex.Message); }
	//        return www;
	//#endif
	//    }

	//    /// <summary>
	//    /// New WWW call can fail if the crossdomain policy doesn't check out. Exceptions suck. It's much more elegant to check for null instead.
	//    /// </summary>

	//    static public WWW OpenURL (string url, WWWForm form)
	//    {
	//        if (form == null) return OpenURL(url);
	//#if UNITY_FLASH
	//        Debug.LogError("WWW is not yet implemented in Flash");
	//        return null;
	//#else
	//        WWW www = null;
	//        try { www = new WWW(url, form); }
	//        catch (System.Exception ex) { Debug.LogError(ex != null ? ex.Message : "<null>"); }
	//        return www;
	//#endif
	//    }

	/// <summary>
	/// Same as Random.Range, but the returned value is between min and max, inclusive.
	/// Unity's Random.Range is less than max instead, unless min == max.
	/// This means Range(0,1) produces 0 instead of 0 or 1. That's unacceptable.
	/// </summary>

	static public int RandomRange (int min, int max)
	{
		if (min == max)
			return min;
		return UnityEngine.Random.Range (min, max + 1);
	}

	/// <summary>
	/// Returns the hierarchy of the object in a human-readable format.
	/// </summary>

	static public string GetHierarchy (GameObject obj)
	{
		if (obj == null)
			return "";
		string path = obj.name;

		while (obj.transform.parent != null) {
			obj = obj.transform.parent.gameObject;
			path = obj.name + "\\" + path;
		}
		return path;
	}

	/// <summary>
	/// Find all active objects of specified type.
	/// </summary>

	static public T[] FindActive<T> () where T : Component
	{
		return GameObject.FindObjectsOfType (typeof(T)) as T[];
	}

	/// <summary>
	/// Find the camera responsible for drawing the objects on the specified layer.
	/// </summary>

	static public Camera FindCameraForLayer (int layer)
	{
		int layerMask = 1 << layer;

		Camera cam;

		for (int i = 0; i < UICamera.list.size; ++i) {
			cam = UICamera.list.buffer [i].cachedCamera;
			if (cam && (cam.cullingMask & layerMask) != 0)
				return cam;
		}

		cam = Camera.main;
		if (cam && (cam.cullingMask & layerMask) != 0)
			return cam;

#if UNITY_4_3 || UNITY_FLASH
		Camera[] cameras = NGUITools.FindActive<Camera>();
		for (int i = 0, imax = cameras.Length; i < imax; ++i)
#else
		Camera[] cameras = new Camera[Camera.allCamerasCount];
		int camerasFound = Camera.GetAllCameras (cameras);
		for (int i = 0; i < camerasFound; ++i)
#endif
		{
			cam = cameras [i];
			if (cam && cam.enabled && (cam.cullingMask & layerMask) != 0)
				return cam;
		}
		return null;
	}

	/// <summary>
	/// Add a collider to the game object containing one or more widgets.
	/// </summary>

	static public void AddWidgetCollider (GameObject go)
	{
		AddWidgetCollider (go, false);
	}

	/// <summary>
	/// Add a collider to the game object containing one or more widgets.
	/// </summary>

	static public void AddWidgetCollider (GameObject go, bool considerInactive)
	{
		if (go != null) {
			// 3D collider
			Collider col = go.GetComponent<Collider> ();
			BoxCollider box = col as BoxCollider;

			if (box != null) {
				UpdateWidgetCollider (box, considerInactive);
				return;
			}

			// Is there already another collider present? If so, do nothing.
			if (col != null)
				return;

			// 2D collider
			BoxCollider2D box2 = go.GetComponent<BoxCollider2D> ();

			if (box2 != null) {
				UpdateWidgetCollider (box2, considerInactive);
				return;
			}

			UICamera ui = UICamera.FindCameraForLayer (go.layer);

			if (ui != null && (ui.eventType == UICamera.EventType.World_2D || ui.eventType == UICamera.EventType.UI_2D)) {
				box2 = go.AddComponent<BoxCollider2D> ();
				box2.isTrigger = true;
#if UNITY_EDITOR
				UnityEditor.Undo.RegisterCreatedObjectUndo (box2, "Add Collider");
#endif
				UIWidget widget = go.GetComponent<UIWidget> ();
				if (widget != null)
					widget.autoResizeBoxCollider = true;
				UpdateWidgetCollider (box2, considerInactive);
				return;
			} else {
				box = go.AddComponent<BoxCollider> ();
#if UNITY_EDITOR
				UnityEditor.Undo.RegisterCreatedObjectUndo (box, "Add Collider");
#endif
				box.isTrigger = true;

				UIWidget widget = go.GetComponent<UIWidget> ();
				if (widget != null)
					widget.autoResizeBoxCollider = true;
				UpdateWidgetCollider (box, considerInactive);
			}
		}
		return;
	}

	/// <summary>
	/// Adjust the widget's collider based on the depth of the widgets, as well as the widget's dimensions.
	/// </summary>

	static public void UpdateWidgetCollider (GameObject go)
	{
		UpdateWidgetCollider (go, false);
	}

	/// <summary>
	/// Adjust the widget's collider based on the depth of the widgets, as well as the widget's dimensions.
	/// </summary>

	static public void UpdateWidgetCollider (GameObject go, bool considerInactive)
	{
		if (go != null) {
			BoxCollider bc = go.GetComponent<BoxCollider> ();

			if (bc != null) {
				UpdateWidgetCollider (bc, considerInactive);
				return;
			}
			BoxCollider2D box2 = go.GetComponent<BoxCollider2D> ();
			if (box2 != null)
				UpdateWidgetCollider (box2, considerInactive);
		}
	}

	/// <summary>
	/// Adjust the widget's collider based on the depth of the widgets, as well as the widget's dimensions.
	/// </summary>

	static public void UpdateWidgetCollider (BoxCollider box, bool considerInactive)
	{
		if (box != null) {
			GameObject go = box.gameObject;
			UIWidget w = go.GetComponent<UIWidget> ();

			if (w != null) {
				Vector4 dr = w.drawRegion;

				if (dr.x != 0f || dr.y != 0f || dr.z != 1f || dr.w != 1f) {
					Vector4 region = w.drawingDimensions;
					box.center = new Vector3 ((region.x + region.z) * 0.5f, (region.y + region.w) * 0.5f);
					box.size = new Vector3 (region.z - region.x, region.w - region.y);
				} else {
					Vector3[] corners = w.localCorners;
					box.center = Vector3.Lerp (corners [0], corners [2], 0.5f);
					box.size = corners [2] - corners [0];
				}
			} else {
				Bounds b = NGUIMath.CalculateRelativeWidgetBounds (go.transform, considerInactive);
				box.center = b.center;
				box.size = new Vector3 (b.size.x, b.size.y, 0f);
			}
#if UNITY_EDITOR
			NGUITools.SetDirty (box);
#endif
		}
	}

	/// <summary>
	/// Adjust the widget's collider based on the depth of the widgets, as well as the widget's dimensions.
	/// </summary>

	static public void UpdateWidgetCollider (BoxCollider2D box, bool considerInactive)
	{
		if (box != null) {
			GameObject go = box.gameObject;
			UIWidget w = go.GetComponent<UIWidget> ();

			if (w != null) {
				Vector3[] corners = w.localCorners;
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
				box.center = Vector3.Lerp(corners[0], corners[2], 0.5f);
#else
				box.offset = Vector3.Lerp (corners [0], corners [2], 0.5f);
#endif
				box.size = corners [2] - corners [0];
			} else {
				Bounds b = NGUIMath.CalculateRelativeWidgetBounds (go.transform, considerInactive);
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
				box.center = b.center;
#else
				box.offset = b.center;
#endif
				box.size = new Vector2 (b.size.x, b.size.y);
			}
#if UNITY_EDITOR
			NGUITools.SetDirty (box);
#endif
		}
	}

	/// <summary>
	/// Helper function that returns the string name of the type.
	/// </summary>

	static public string GetTypeName<T> ()
	{
		string s = typeof(T).ToString ();
		if (s.StartsWith ("UI"))
			s = s.Substring (2);
		else if (s.StartsWith ("UnityEngine."))
			s = s.Substring (12);
		return s;
	}

	/// <summary>
	/// Helper function that returns the string name of the type.
	/// </summary>

	static public string GetTypeName (UnityEngine.Object obj)
	{
		if (obj == null)
			return "Null";
		string s = obj.GetType ().ToString ();
		if (s.StartsWith ("UI"))
			s = s.Substring (2);
		else if (s.StartsWith ("UnityEngine."))
			s = s.Substring (12);
		return s;
	}

	/// <summary>
	/// Convenience method that works without warnings in both Unity 3 and 4.
	/// </summary>

	static public void RegisterUndo (UnityEngine.Object obj, string name)
	{
#if UNITY_EDITOR
		UnityEditor.Undo.RecordObject (obj, name);
		NGUITools.SetDirty (obj);
#endif
	}

	/// <summary>
	/// Convenience function that marks the specified object as dirty in the Unity Editor.
	/// </summary>

	static public void SetDirty (UnityEngine.Object obj)
	{
#if UNITY_EDITOR
		if (obj) {
			//if (obj is Component) Debug.Log(NGUITools.GetHierarchy((obj as Component).gameObject), obj);
			//else if (obj is GameObject) Debug.Log(NGUITools.GetHierarchy(obj as GameObject), obj);
			//else Debug.Log("Hmm... " + obj.GetType(), obj);
			UnityEditor.EditorUtility.SetDirty (obj);
		}
#endif
	}

	/// <summary>
	/// Add a new child game object.
	/// </summary>

	static public GameObject AddChild (GameObject parent)
	{
		return AddChild (parent, true);
	}

	/// <summary>
	/// Add a new child game object.
	/// </summary>

	static public GameObject AddChild (GameObject parent, bool undo)
	{
		GameObject go = new GameObject ();
#if UNITY_EDITOR
		if (undo)
			UnityEditor.Undo.RegisterCreatedObjectUndo (go, "Create Object");
#endif
		if (parent != null) {
			Transform t = go.transform;
			t.parent = parent.transform;
			t.localPosition = Vector3.zero;
			t.localRotation = Quaternion.identity;
			t.localScale = Vector3.one;
			go.layer = parent.layer;
		}
		return go;
	}

	/// <summary>
	/// Instantiate an object and add it to the specified parent.
	/// </summary>

	static public GameObject AddChild (GameObject parent, GameObject prefab)
	{
		GameObject go = GameObject.Instantiate (prefab) as GameObject;
#if UNITY_EDITOR
		UnityEditor.Undo.RegisterCreatedObjectUndo (go, "Create Object");
#endif
		if (go != null && parent != null) {
			Transform t = go.transform;
			t.parent = parent.transform;
			t.localPosition = Vector3.zero;
			t.localRotation = Quaternion.identity;
			t.localScale = Vector3.one;
			go.layer = parent.layer;
		}
		return go;
	}

	/// <summary>
	/// Calculate the game object's depth based on the widgets within, and also taking panel depth into consideration.
	/// </summary>

	static public int CalculateRaycastDepth (GameObject go)
	{
		UIWidget w = go.GetComponent<UIWidget> ();
		if (w != null)
			return w.raycastDepth;

		UIWidget[] widgets = go.GetComponentsInChildren<UIWidget> ();
		if (widgets.Length == 0)
			return 0;

		int depth = int.MaxValue;
		
		for (int i = 0, imax = widgets.Length; i < imax; ++i) {
			if (widgets [i].enabled)
				depth = Mathf.Min (depth, widgets [i].raycastDepth);
		}
		return depth;
	}

	/// <summary>
	/// Gathers all widgets and calculates the depth for the next widget.
	/// </summary>

	static public int CalculateNextDepth (GameObject go)
	{
		int depth = -1;
		UIWidget[] widgets = go.GetComponentsInChildren<UIWidget> ();
		for (int i = 0, imax = widgets.Length; i < imax; ++i)
			depth = Mathf.Max (depth, widgets [i].depth);
		return depth + 1;
	}

	/// <summary>
	/// Gathers all widgets and calculates the depth for the next widget.
	/// </summary>

	static public int CalculateNextDepth (GameObject go, bool ignoreChildrenWithColliders)
	{
		if (ignoreChildrenWithColliders) {
			int depth = -1;
			UIWidget[] widgets = go.GetComponentsInChildren<UIWidget> ();

			for (int i = 0, imax = widgets.Length; i < imax; ++i) {
				UIWidget w = widgets [i];
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
				if (w.cachedGameObject != go && (w.collider != null || w.GetComponent<Collider2D>() != null)) continue;
#else
				if (w.cachedGameObject != go && (w.GetComponent<Collider> () != null || w.GetComponent<Collider2D> () != null))
					continue;
#endif
				depth = Mathf.Max (depth, w.depth);
			}
			return depth + 1;
		}
		return CalculateNextDepth (go);
	}

	/// <summary>
	/// Adjust the widgets' depth by the specified value.
	/// Returns '0' if nothing was adjusted, '1' if panels were adjusted, and '2' if widgets were adjusted.
	/// </summary>

	static public int AdjustDepth (GameObject go, int adjustment)
	{
		if (go != null) {
			UIPanel panel = go.GetComponent<UIPanel> ();

			if (panel != null) {
				UIPanel[] panels = go.GetComponentsInChildren<UIPanel> (true);
				
				for (int i = 0; i < panels.Length; ++i) {
					UIPanel p = panels [i];
#if UNITY_EDITOR
					RegisterUndo (p, "Depth Change");
#endif
					p.depth = p.depth + adjustment;
				}
				return 1;
			} else {
				panel = FindInParents<UIPanel> (go);
				if (panel == null)
					return 0;

				UIWidget[] widgets = go.GetComponentsInChildren<UIWidget> (true);

				for (int i = 0, imax = widgets.Length; i < imax; ++i) {
					UIWidget w = widgets [i];
					if (w.panel != panel)
						continue;
#if UNITY_EDITOR
					RegisterUndo (w, "Depth Change");
#endif
					w.depth = w.depth + adjustment;
				}
				return 2;
			}
		}
		return 0;
	}

	/// <summary>
	/// Bring all of the widgets on the specified object forward.
	/// </summary>

	static public void BringForward (GameObject go)
	{
		int val = AdjustDepth (go, 1000);
		if (val == 1)
			NormalizePanelDepths ();
		else if (val == 2)
			NormalizeWidgetDepths ();
	}

	/// <summary>
	/// Push all of the widgets on the specified object back, making them appear behind everything else.
	/// </summary>

	static public void PushBack (GameObject go)
	{
		int val = AdjustDepth (go, -1000);
		if (val == 1)
			NormalizePanelDepths ();
		else if (val == 2)
			NormalizeWidgetDepths ();
	}

	/// <summary>
	/// Normalize the depths of all the widgets and panels in the scene, making them start from 0 and remain in order.
	/// </summary>

	static public void NormalizeDepths ()
	{
		NormalizeWidgetDepths ();
		NormalizePanelDepths ();
	}

	/// <summary>
	/// Normalize the depths of all the widgets in the scene, making them start from 0 and remain in order.
	/// </summary>

	static public void NormalizeWidgetDepths ()
	{
		NormalizeWidgetDepths (FindActive<UIWidget> ());
	}

	/// <summary>
	/// Normalize the depths of all the widgets in the scene, making them start from 0 and remain in order.
	/// </summary>

	static public void NormalizeWidgetDepths (GameObject go)
	{
		NormalizeWidgetDepths (go.GetComponentsInChildren<UIWidget> ());
	}

	/// <summary>
	/// Normalize the depths of all the widgets in the scene, making them start from 0 and remain in order.
	/// </summary>

	static public void NormalizeWidgetDepths (UIWidget[] list)
	{
		int size = list.Length;

		if (size > 0) {
			Array.Sort (list, UIWidget.FullCompareFunc);

			int start = 0;
			int current = list [0].depth;

			for (int i = 0; i < size; ++i) {
				UIWidget w = list [i];

				if (w.depth == current) {
					w.depth = start;
				} else {
					current = w.depth;
					w.depth = ++start;
				}
			}
		}
	}

	/// <summary>
	/// Normalize the depths of all the panels in the scene, making them start from 0 and remain in order.
	/// </summary>

	static public void NormalizePanelDepths ()
	{
		UIPanel[] list = FindActive<UIPanel> ();
		int size = list.Length;

		if (size > 0) {
			Array.Sort (list, UIPanel.CompareFunc);

			int start = 0;
			int current = list [0].depth;

			for (int i = 0; i < size; ++i) {
				UIPanel p = list [i];

				if (p.depth == current) {
					p.depth = start;
				} else {
					current = p.depth;
					p.depth = ++start;
				}
			}
		}
	}

	/// <summary>
	/// Create a new UI.
	/// </summary>

	static public UIPanel CreateUI (bool advanced3D)
	{
		return CreateUI (null, advanced3D, -1);
	}

	/// <summary>
	/// Create a new UI.
	/// </summary>

	static public UIPanel CreateUI (bool advanced3D, int layer)
	{
		return CreateUI (null, advanced3D, layer);
	}

	/// <summary>
	/// Create a new UI.
	/// </summary>

	static public UIPanel CreateUI (Transform trans, bool advanced3D, int layer)
	{
		// Find the existing UI Root
		UIRoot root = (trans != null) ? NGUITools.FindInParents<UIRoot> (trans.gameObject) : null;

		if (root == null && UIRoot.list.Count > 0) {
			foreach (UIRoot r in UIRoot.list) {
				if (r.gameObject.layer == layer) {
					root = r;
					break;
				}
			}
		}

		// Try to find an existing panel
		if (root == null) {
			for (int i = 0, imax = UIPanel.list.Count; i < imax; ++i) {
				UIPanel p = UIPanel.list [i];
				GameObject go = p.gameObject;

				if (go.hideFlags == HideFlags.None && go.layer == layer) {
					trans.parent = p.transform;
					trans.localScale = Vector3.one;
					return p;
				}
			}
		}

		// If we are working with a different UI type, we need to treat it as a brand-new one instead
		if (root != null) {
			UICamera cam = root.GetComponentInChildren<UICamera> ();

#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
			if (cam != null && cam.camera.isOrthoGraphic == advanced3D)
#else
			if (cam != null && cam.GetComponent<Camera> ().orthographic == advanced3D)
#endif
			{
				trans = null;
				root = null;
			}
		}

		// If no root found, create one
		if (root == null) {
			GameObject go = NGUITools.AddChild (null, false);
			root = go.AddComponent<UIRoot> ();

			// Automatically find the layers if none were specified
			if (layer == -1)
				layer = LayerMask.NameToLayer ("UI");
			if (layer == -1)
				layer = LayerMask.NameToLayer ("2D UI");
			go.layer = layer;

			if (advanced3D) {
				go.name = "UI Root (3D)";
				root.scalingStyle = UIRoot.Scaling.Constrained;
			} else {
				go.name = "UI Root";
				root.scalingStyle = UIRoot.Scaling.Flexible;
			}
		}

		// Find the first panel
		UIPanel panel = root.GetComponentInChildren<UIPanel> ();

		if (panel == null) {
			// Find other active cameras in the scene
			Camera[] cameras = NGUITools.FindActive<Camera> ();

			float depth = -1f;
			bool colorCleared = false;
			int mask = (1 << root.gameObject.layer);

			for (int i = 0; i < cameras.Length; ++i) {
				Camera c = cameras [i];

				// If the color is being cleared, we won't need to
				if (c.clearFlags == CameraClearFlags.Color ||
				    c.clearFlags == CameraClearFlags.Skybox)
					colorCleared = true;

				// Choose the maximum depth
				depth = Mathf.Max (depth, c.depth);

				// Make sure this camera can't see the UI
				c.cullingMask = (c.cullingMask & (~mask));
			}

			// Create a camera that will draw the UI
			Camera cam = NGUITools.AddChild<Camera> (root.gameObject, false);
			cam.gameObject.AddComponent<UICamera> ();
			cam.clearFlags = colorCleared ? CameraClearFlags.Depth : CameraClearFlags.Color;
			cam.backgroundColor = Color.grey;
			cam.cullingMask = mask;
			cam.depth = depth + 1f;

			if (advanced3D) {
				cam.nearClipPlane = 0.1f;
				cam.farClipPlane = 4f;
				cam.transform.localPosition = new Vector3 (0f, 0f, -700f);
			} else {
				cam.orthographic = true;
				cam.orthographicSize = 1;
				cam.nearClipPlane = -10;
				cam.farClipPlane = 10;
			}

			// Make sure there is an audio listener present
			AudioListener[] listeners = NGUITools.FindActive<AudioListener> ();
			if (listeners == null || listeners.Length == 0)
				cam.gameObject.AddComponent<AudioListener> ();

			// Add a panel to the root
			panel = root.gameObject.AddComponent<UIPanel> ();
#if UNITY_EDITOR
			UnityEditor.Selection.activeGameObject = panel.gameObject;
#endif
		}

		if (trans != null) {
			// Find the root object
			while (trans.parent != null)
				trans = trans.parent;

			if (NGUITools.IsChild (trans, panel.transform)) {
				// Odd hierarchy -- can't reparent
				panel = trans.gameObject.AddComponent<UIPanel> ();
			} else {
				// Reparent this root object to be a child of the panel
				trans.parent = panel.transform;
				trans.localScale = Vector3.one;
				trans.localPosition = Vector3.zero;
				SetChildLayer (panel.cachedTransform, panel.cachedGameObject.layer);
			}
		}
		return panel;
	}

	/// <summary>
	/// Helper function that recursively sets all children with widgets' game objects layers to the specified value.
	/// </summary>

	static public void SetChildLayer (Transform t, int layer)
	{
		for (int i = 0; i < t.childCount; ++i) {
			Transform child = t.GetChild (i);
			child.gameObject.layer = layer;
			SetChildLayer (child, layer);
		}
	}

	/// <summary>
	/// Add a child object to the specified parent and attaches the specified script to it.
	/// </summary>

	static public T AddChild<T> (GameObject parent) where T : Component
	{
		GameObject go = AddChild (parent);
		go.name = GetTypeName<T> ();
		return go.AddComponent<T> ();
	}

	/// <summary>
	/// Add a child object to the specified parent and attaches the specified script to it.
	/// </summary>

	static public T AddChild<T> (GameObject parent, bool undo) where T : Component
	{
		GameObject go = AddChild (parent, undo);
		go.name = GetTypeName<T> ();
		return go.AddComponent<T> ();
	}

	/// <summary>
	/// Add a new widget of specified type.
	/// </summary>

	static public T AddWidget<T> (GameObject go) where T : UIWidget
	{
		int depth = CalculateNextDepth (go);

		// Create the widget and place it above other widgets
		T widget = AddChild<T> (go);
		widget.width = 100;
		widget.height = 100;
		widget.depth = depth;
		return widget;
	}

	/// <summary>
	/// Add a new widget of specified type.
	/// </summary>

	static public T AddWidget<T> (GameObject go, int depth) where T : UIWidget
	{
		// Create the widget and place it above other widgets
		T widget = AddChild<T> (go);
		widget.width = 100;
		widget.height = 100;
		widget.depth = depth;
		return widget;
	}

	/// <summary>
	/// Add a sprite appropriate for the specified atlas sprite.
	/// It will be sliced if the sprite has an inner rect, and a regular sprite otherwise.
	/// </summary>

	static public UISprite AddSprite (GameObject go, UIAtlas atlas, string spriteName)
	{
		UISpriteData sp = (atlas != null) ? atlas.GetSprite (spriteName) : null;
		UISprite sprite = AddWidget<UISprite> (go);
		sprite.type = (sp == null || !sp.hasBorder) ? UISprite.Type.Simple : UISprite.Type.Sliced;
		sprite.spriteName = spriteName;
		sprite.atlas = atlas;
		return sprite;
	}

	/// <summary>
	/// Get the rootmost object of the specified game object.
	/// </summary>

	static public GameObject GetRoot (GameObject go)
	{
		Transform t = go.transform;

		for (; ;) {
			Transform parent = t.parent;
			if (parent == null)
				break;
			t = parent;
		}
		return t.gameObject;
	}

	/// <summary>
	/// Finds the specified component on the game object or one of its parents.
	/// </summary>

	static public T FindInParents<T> (GameObject go) where T : Component
	{
		if (go == null)
			return null;
		// Commented out because apparently it causes Unity 4.5.3 to lag horribly:
		// http://www.tasharen.com/forum/index.php?topic=10882.0
//#if UNITY_4_3
		#if UNITY_FLASH
		object comp = go.GetComponent<T>();
		#else
		T comp = go.GetComponent<T> ();
		#endif
		if (comp == null) {
			Transform t = go.transform.parent;

			while (t != null && comp == null) {
				comp = t.gameObject.GetComponent<T> ();
				t = t.parent;
			}
		}
		#if UNITY_FLASH
		return (T)comp;
		#else
		return comp;
		#endif
//#else
//		return go.GetComponentInParent<T>();
//#endif
	}

	/// <summary>
	/// Finds the specified component on the game object or one of its parents.
	/// </summary>

	static public T FindInParents<T> (Transform trans) where T : Component
	{
		if (trans == null)
			return null;
		#if UNITY_4_3 || UNITY_5
		#if UNITY_FLASH
		object comp = trans.GetComponent<T>();
		#else
		T comp = trans.GetComponent<T>();
		#endif
		if (comp == null)
		{
			Transform t = trans.transform.parent;

			while (t != null && comp == null)
			{
				comp = t.gameObject.GetComponent<T>();
				t = t.parent;
			}
		}
		#if UNITY_FLASH
		return (T)comp;
		#else
		return comp;
		#endif
#else
		return trans.GetComponentInParent<T> ();
#endif
	}

	/// <summary>
	/// Destroy the specified object, immediately if in edit mode.
	/// </summary>

	static public void Destroy (UnityEngine.Object obj)
	{
		if (obj != null) {
			if (obj is Transform)
				obj = (obj as Transform).gameObject;

			if (Application.isPlaying) {
				if (obj is GameObject) {
					GameObject go = obj as GameObject;
					go.transform.parent = null;
				}

				UnityEngine.Object.Destroy (obj);
			} else
				UnityEngine.Object.DestroyImmediate (obj);
		}
	}

	/// <summary>
	/// Destroy the specified object immediately, unless not in the editor, in which case the regular Destroy is used instead.
	/// </summary>

	static public void DestroyImmediate (UnityEngine.Object obj)
	{
		if (obj != null) {
			if (Application.isEditor)
				UnityEngine.Object.DestroyImmediate (obj);
			else
				UnityEngine.Object.Destroy (obj);
		}
	}

	/// <summary>
	/// Call the specified function on all objects in the scene.
	/// </summary>

	static public void Broadcast (string funcName)
	{
		GameObject[] gos = GameObject.FindObjectsOfType (typeof(GameObject)) as GameObject[];
		for (int i = 0, imax = gos.Length; i < imax; ++i)
			gos [i].SendMessage (funcName, SendMessageOptions.DontRequireReceiver);
	}

	/// <summary>
	/// Call the specified function on all objects in the scene.
	/// </summary>

	static public void Broadcast (string funcName, object param)
	{
		GameObject[] gos = GameObject.FindObjectsOfType (typeof(GameObject)) as GameObject[];
		for (int i = 0, imax = gos.Length; i < imax; ++i)
			gos [i].SendMessage (funcName, param, SendMessageOptions.DontRequireReceiver);
	}

	/// <summary>
	/// Determines whether the 'parent' contains a 'child' in its hierarchy.
	/// </summary>

	static public bool IsChild (Transform parent, Transform child)
	{
		if (parent == null || child == null)
			return false;

		while (child != null) {
			if (child == parent)
				return true;
			child = child.parent;
		}
		return false;
	}

	/// <summary>
	/// Activate the specified object and all of its children.
	/// </summary>

	static void Activate (Transform t)
	{
		Activate (t, false);
	}

	/// <summary>
	/// Activate the specified object and all of its children.
	/// </summary>

	static void Activate (Transform t, bool compatibilityMode)
	{
		SetActiveSelf (t.gameObject, true);

		if (compatibilityMode) {
			// If there is even a single enabled child, then we're using a Unity 4.0-based nested active state scheme.
			for (int i = 0, imax = t.childCount; i < imax; ++i) {
				Transform child = t.GetChild (i);
				if (child.gameObject.activeSelf)
					return;
			}

			// If this point is reached, then all the children are disabled, so we must be using a Unity 3.5-based active state scheme.
			for (int i = 0, imax = t.childCount; i < imax; ++i) {
				Transform child = t.GetChild (i);
				Activate (child, true);
			}
		}
	}

	/// <summary>
	/// Deactivate the specified object and all of its children.
	/// </summary>

	static void Deactivate (Transform t)
	{
		SetActiveSelf (t.gameObject, false);
	}

	/// <summary>
	/// SetActiveRecursively enables children before parents. This is a problem when a widget gets re-enabled
	/// and it tries to find a panel on its parent.
	/// </summary>

	static public void SetActive (GameObject go, bool state)
	{
		SetActive (go, state, true);
	}

	/// <summary>
	/// SetActiveRecursively enables children before parents. This is a problem when a widget gets re-enabled
	/// and it tries to find a panel on its parent.
	/// </summary>

	static public void SetActive (GameObject go, bool state, bool compatibilityMode)
	{
		if (go) {
			if (state) {
				Activate (go.transform, compatibilityMode);
#if UNITY_EDITOR
				if (Application.isPlaying)
#endif
					CallCreatePanel (go.transform);
			} else
				Deactivate (go.transform);
		}
	}

	/// <summary>
	/// Ensure that all widgets have had their panels created, forcing the update right away rather than on the following frame.
	/// </summary>

	[System.Diagnostics.DebuggerHidden]
	[System.Diagnostics.DebuggerStepThrough]
	static void CallCreatePanel (Transform t)
	{
		UIWidget w = t.GetComponent<UIWidget> ();
		if (w != null)
			w.CreatePanel ();
		for (int i = 0, imax = t.childCount; i < imax; ++i)
			CallCreatePanel (t.GetChild (i));
	}

	/// <summary>
	/// Activate or deactivate children of the specified game object without changing the active state of the object itself.
	/// </summary>

	static public void SetActiveChildren (GameObject go, bool state)
	{
		Transform t = go.transform;

		if (state) {
			for (int i = 0, imax = t.childCount; i < imax; ++i) {
				Transform child = t.GetChild (i);
				Activate (child);
			}
		} else {
			for (int i = 0, imax = t.childCount; i < imax; ++i) {
				Transform child = t.GetChild (i);
				Deactivate (child);
			}
		}
	}

	/// <summary>
	/// Helper function that returns whether the specified MonoBehaviour is active.
	/// </summary>

	[System.Obsolete ("Use NGUITools.GetActive instead")]
	static public bool IsActive (Behaviour mb)
	{
		return mb != null && mb.enabled && mb.gameObject.activeInHierarchy;
	}

	/// <summary>
	/// Helper function that returns whether the specified MonoBehaviour is active.
	/// </summary>

	[System.Diagnostics.DebuggerHidden]
	[System.Diagnostics.DebuggerStepThrough]
	static public bool GetActive (Behaviour mb)
	{
		return mb && mb.enabled && mb.gameObject.activeInHierarchy;
	}

	/// <summary>
	/// Unity4 has changed GameObject.active to GameObject.activeself.
	/// </summary>

	[System.Diagnostics.DebuggerHidden]
	[System.Diagnostics.DebuggerStepThrough]
	static public bool GetActive (GameObject go)
	{
		return go && go.activeInHierarchy;
	}

	/// <summary>
	/// Unity4 has changed GameObject.active to GameObject.SetActive.
	/// </summary>

	[System.Diagnostics.DebuggerHidden]
	[System.Diagnostics.DebuggerStepThrough]
	static public void SetActiveSelf (GameObject go, bool state)
	{
		go.SetActive (state);
	}

	/// <summary>
	/// Recursively set the game object's layer.
	/// </summary>

	static public void SetLayer (GameObject go, int layer)
	{
		go.layer = layer;

		Transform t = go.transform;
		
		for (int i = 0, imax = t.childCount; i < imax; ++i) {
			Transform child = t.GetChild (i);
			SetLayer (child.gameObject, layer);
		}
	}

	/// <summary>
	/// Helper function used to make the vector use integer numbers.
	/// </summary>

	static public Vector3 Round (Vector3 v)
	{
		v.x = Mathf.Round (v.x);
		v.y = Mathf.Round (v.y);
		v.z = Mathf.Round (v.z);
		return v;
	}

	/// <summary>
	/// Make the specified selection pixel-perfect.
	/// </summary>

	static public void MakePixelPerfect (Transform t)
	{
		UIWidget w = t.GetComponent<UIWidget> ();
		if (w != null)
			w.MakePixelPerfect ();

		if (t.GetComponent<UIAnchor> () == null && t.GetComponent<UIRoot> () == null) {
#if UNITY_EDITOR
			RegisterUndo (t, "Make Pixel-Perfect");
#endif
			t.localPosition = Round (t.localPosition);
			t.localScale = Round (t.localScale);
		}

		// Recurse into children
		for (int i = 0, imax = t.childCount; i < imax; ++i)
			MakePixelPerfect (t.GetChild (i));
	}

	/// <summary>
	/// Save the specified binary data into the specified file.
	/// </summary>

	static public bool Save (string fileName, byte[] bytes)
	{
#if UNITY_WEBPLAYER || UNITY_FLASH || UNITY_METRO || UNITY_WP8 || UNITY_WP_8_1
		return false;
#else
		if (!NGUITools.fileAccess)
			return false;

		string path = Application.persistentDataPath + "/" + fileName;

		if (bytes == null) {
			if (File.Exists (path))
				File.Delete (path);
			return true;
		}

		FileStream file = null;

		try {
			file = File.Create (path);
		} catch (System.Exception ex) {
			Debug.LogError (ex.Message);
			return false;
		}

		file.Write (bytes, 0, bytes.Length);
		file.Close ();
		return true;
#endif
	}

	/// <summary>
	/// Load all binary data from the specified file.
	/// </summary>

	static public byte[] Load (string fileName)
	{
#if UNITY_WEBPLAYER || UNITY_FLASH || UNITY_METRO || UNITY_WP8 || UNITY_WP_8_1
		return null;
#else
		if (!NGUITools.fileAccess)
			return null;

		string path = Application.persistentDataPath + "/" + fileName;

		if (File.Exists (path)) {
			return File.ReadAllBytes (path);
		}
		return null;
#endif
	}

	/// <summary>
	/// Pre-multiply shaders result in a black outline if this operation is done in the shader. It's better to do it outside.
	/// </summary>

	static public Color ApplyPMA (Color c)
	{
		if (c.a != 1f) {
			c.r *= c.a;
			c.g *= c.a;
			c.b *= c.a;
		}
		return c;
	}

	/// <summary>
	/// Inform all widgets underneath the specified object that the parent has changed.
	/// </summary>

	static public void MarkParentAsChanged (GameObject go)
	{
		UIRect[] rects = go.GetComponentsInChildren<UIRect> ();
		for (int i = 0, imax = rects.Length; i < imax; ++i)
			rects [i].ParentHasChanged ();
	}

	/// <summary>
	/// Access to the clipboard via undocumented APIs.
	/// </summary>

	static public string clipboard {
		get {
			TextEditor te = new TextEditor ();
			te.Paste ();
			return te.content.text;
		}
		set {
			TextEditor te = new TextEditor ();
			te.content = new GUIContent (value);
			te.OnFocus ();
			te.Copy ();
		}
	}

	[System.Obsolete ("Use NGUIText.EncodeColor instead")]
	static public string EncodeColor (Color c)
	{
		return NGUIText.EncodeColor24 (c);
	}

	[System.Obsolete ("Use NGUIText.ParseColor instead")]
	static public Color ParseColor (string text, int offset)
	{
		return NGUIText.ParseColor24 (text, offset);
	}

	[System.Obsolete ("Use NGUIText.StripSymbols instead")]
	static public string StripSymbols (string text)
	{
		return NGUIText.StripSymbols (text);
	}

	/// <summary>
	/// Extension for the game object that checks to see if the component already exists before adding a new one.
	/// If the component is already present it will be returned instead.
	/// </summary>

	static public T AddMissingComponent<T> (this GameObject go) where T : Component
	{
#if UNITY_FLASH
		object comp = go.GetComponent<T>();
#else
		T comp = go.GetComponent<T> ();
#endif
		if (comp == null) {
#if UNITY_EDITOR
			if (!Application.isPlaying)
				RegisterUndo (go, "Add " + typeof(T));
#endif
			comp = go.AddComponent<T> ();
		}
#if UNITY_FLASH
		return (T)comp;
#else
		return comp;
#endif
	}

	// Temporary variable to avoid GC allocation
	static Vector3[] mSides = new Vector3[4];

	/// <summary>
	/// Get sides relative to the specified camera. The order is left, top, right, bottom.
	/// </summary>

	static public Vector3[] GetSides (this Camera cam)
	{
		return cam.GetSides (Mathf.Lerp (cam.nearClipPlane, cam.farClipPlane, 0.5f), null);
	}

	/// <summary>
	/// Get sides relative to the specified camera. The order is left, top, right, bottom.
	/// </summary>

	static public Vector3[] GetSides (this Camera cam, float depth)
	{
		return cam.GetSides (depth, null);
	}

	/// <summary>
	/// Get sides relative to the specified camera. The order is left, top, right, bottom.
	/// </summary>

	static public Vector3[] GetSides (this Camera cam, Transform relativeTo)
	{
		return cam.GetSides (Mathf.Lerp (cam.nearClipPlane, cam.farClipPlane, 0.5f), relativeTo);
	}

	/// <summary>
	/// Get sides relative to the specified camera. The order is left, top, right, bottom.
	/// </summary>

	static public Vector3[] GetSides (this Camera cam, float depth, Transform relativeTo)
	{
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
		if (cam.isOrthoGraphic)
#else
		if (cam.orthographic)
#endif
		{
			float os = cam.orthographicSize;
			float x0 = -os;
			float x1 = os;
			float y0 = -os;
			float y1 = os;

			Rect rect = cam.rect;
			Vector2 size = screenSize;

			float aspect = size.x / size.y;
			aspect *= rect.width / rect.height;
			x0 *= aspect;
			x1 *= aspect;

			// We want to ignore the scale, as scale doesn't affect the camera's view region in Unity
			Transform t = cam.transform;
			Quaternion rot = t.rotation;
			Vector3 pos = t.position;

			int w = Mathf.RoundToInt (size.x);
			int h = Mathf.RoundToInt (size.y);

			if ((w & 1) == 1)
				pos.x -= 1f / size.x;
			if ((h & 1) == 1)
				pos.y += 1f / size.y;

			mSides [0] = rot * (new Vector3 (x0, 0f, depth)) + pos;
			mSides [1] = rot * (new Vector3 (0f, y1, depth)) + pos;
			mSides [2] = rot * (new Vector3 (x1, 0f, depth)) + pos;
			mSides [3] = rot * (new Vector3 (0f, y0, depth)) + pos;
		} else {
			mSides [0] = cam.ViewportToWorldPoint (new Vector3 (0f, 0.5f, depth));
			mSides [1] = cam.ViewportToWorldPoint (new Vector3 (0.5f, 1f, depth));
			mSides [2] = cam.ViewportToWorldPoint (new Vector3 (1f, 0.5f, depth));
			mSides [3] = cam.ViewportToWorldPoint (new Vector3 (0.5f, 0f, depth));
		}
		
		if (relativeTo != null) {
			for (int i = 0; i < 4; ++i)
				mSides [i] = relativeTo.InverseTransformPoint (mSides [i]);
		}
		return mSides;
	}

	/// <summary>
	/// Get the camera's world-space corners. The order is bottom-left, top-left, top-right, bottom-right.
	/// </summary>

	static public Vector3[] GetWorldCorners (this Camera cam)
	{
		float depth = Mathf.Lerp (cam.nearClipPlane, cam.farClipPlane, 0.5f);
		return cam.GetWorldCorners (depth, null);
	}

	/// <summary>
	/// Get the camera's world-space corners. The order is bottom-left, top-left, top-right, bottom-right.
	/// </summary>

	static public Vector3[] GetWorldCorners (this Camera cam, float depth)
	{
		return cam.GetWorldCorners (depth, null);
	}

	/// <summary>
	/// Get the camera's world-space corners. The order is bottom-left, top-left, top-right, bottom-right.
	/// </summary>

	static public Vector3[] GetWorldCorners (this Camera cam, Transform relativeTo)
	{
		return cam.GetWorldCorners (Mathf.Lerp (cam.nearClipPlane, cam.farClipPlane, 0.5f), relativeTo);
	}

	/// <summary>
	/// Get the camera's world-space corners. The order is bottom-left, top-left, top-right, bottom-right.
	/// </summary>

	static public Vector3[] GetWorldCorners (this Camera cam, float depth, Transform relativeTo)
	{
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
		if (cam.isOrthoGraphic)
#else
		if (cam.orthographic)
#endif
		{
			float os = cam.orthographicSize;
			float x0 = -os;
			float x1 = os;
			float y0 = -os;
			float y1 = os;

			Rect rect = cam.rect;
			Vector2 size = screenSize;
			float aspect = size.x / size.y;
			aspect *= rect.width / rect.height;
			x0 *= aspect;
			x1 *= aspect;

			// We want to ignore the scale, as scale doesn't affect the camera's view region in Unity
			Transform t = cam.transform;
			Quaternion rot = t.rotation;
			Vector3 pos = t.position;

			mSides [0] = rot * (new Vector3 (x0, y0, depth)) + pos;
			mSides [1] = rot * (new Vector3 (x0, y1, depth)) + pos;
			mSides [2] = rot * (new Vector3 (x1, y1, depth)) + pos;
			mSides [3] = rot * (new Vector3 (x1, y0, depth)) + pos;
		} else {
			mSides [0] = cam.ViewportToWorldPoint (new Vector3 (0f, 0f, depth));
			mSides [1] = cam.ViewportToWorldPoint (new Vector3 (0f, 1f, depth));
			mSides [2] = cam.ViewportToWorldPoint (new Vector3 (1f, 1f, depth));
			mSides [3] = cam.ViewportToWorldPoint (new Vector3 (1f, 0f, depth));
		}

		if (relativeTo != null) {
			for (int i = 0; i < 4; ++i)
				mSides [i] = relativeTo.InverseTransformPoint (mSides [i]);
		}
		return mSides;
	}

	/// <summary>
	/// Convenience function that converts Class + Function combo into Class.Function representation.
	/// </summary>

	static public string GetFuncName (object obj, string method)
	{
		if (obj == null)
			return "<null>";
		string type = obj.GetType ().ToString ();
		int period = type.LastIndexOf ('/');
		if (period > 0)
			type = type.Substring (period + 1);
		return string.IsNullOrEmpty (method) ? type : type + "/" + method;
	}

	#if UNITY_EDITOR || !UNITY_FLASH
	/// <summary>
	/// Execute the specified function on the target game object.
	/// </summary>

	static public void Execute<T> (GameObject go, string funcName) where T : Component
	{
		T[] comps = go.GetComponents<T> ();

		foreach (T comp in comps) {
#if !UNITY_EDITOR && (UNITY_WEBPLAYER || UNITY_FLASH || UNITY_METRO || UNITY_WP8 || UNITY_WP_8_1)
			comp.SendMessage(funcName, SendMessageOptions.DontRequireReceiver);
#else
			MethodInfo method = comp.GetType ().GetMethod (funcName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
			if (method != null)
				method.Invoke (comp, null);
#endif
		}
	}

	/// <summary>
	/// Execute the specified function on the target game object and all of its children.
	/// </summary>

	static public void ExecuteAll<T> (GameObject root, string funcName) where T : Component
	{
		Execute<T> (root, funcName);
		Transform t = root.transform;
		for (int i = 0, imax = t.childCount; i < imax; ++i)
			ExecuteAll<T> (t.GetChild (i).gameObject, funcName);
	}

	/// <summary>
	/// Immediately start, update, and create all the draw calls from newly instantiated UI.
	/// This is useful if you plan on doing something like immediately taking a screenshot then destroying the UI.
	/// </summary>

	static public void ImmediatelyCreateDrawCalls (GameObject root)
	{
		ExecuteAll<UIWidget> (root, "Start");
		ExecuteAll<UIPanel> (root, "Start");
		ExecuteAll<UIWidget> (root, "Update");
		ExecuteAll<UIPanel> (root, "Update");
		ExecuteAll<UIPanel> (root, "LateUpdate");
	}
	#endif

	#if UNITY_EDITOR
	static int mSizeFrame = -1;
	static System.Reflection.MethodInfo s_GetSizeOfMainGameView;
	static Vector2 mGameSize = Vector2.one;

	/// <summary>
	/// Size of the game view cannot be retrieved from Screen.width and Screen.height when the game view is hidden.
	/// </summary>

	static public Vector2 screenSize {
		get {
			int frame = Time.frameCount;

			if (mSizeFrame != frame || !Application.isPlaying) {
				mSizeFrame = frame;

				if (s_GetSizeOfMainGameView == null) {
					System.Type type = System.Type.GetType ("UnityEditor.GameView,UnityEditor");
					s_GetSizeOfMainGameView = type.GetMethod ("GetSizeOfMainGameView",
						System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
				}
				mGameSize = (Vector2)s_GetSizeOfMainGameView.Invoke (null, null);
			}
			return mGameSize;

		}
	}

#else
	/// <summary>
	/// Size of the game view cannot be retrieved from Screen.width and Screen.height when the game view is hidden.
	/// </summary>
	
	static public Vector2 screenSize { get { return new Vector2(Screen.width, Screen.height); } }
	//static public Vector2 screenSize { get { return new Vector2(Screen.safeArea.width, Screen.safeArea.height); } }
#endif

    #region add by chenbin

    public static void updateAll (Transform tr)
	{
		UILabel label = tr.GetComponent<UILabel> ();
		if (label != null) {
			label.ProcessText ();
			label.ResetAndUpdateAnchors ();
			label.MarkAsChanged();
			label.Update ();
		} else {
			UISprite sprite = tr.GetComponent<UISprite> ();
			if(sprite != null) {
				sprite.ResetAndUpdateAnchors ();
				sprite.Update ();
			} else {
				UIWidget widget = tr.GetComponent<UIWidget> ();
				if (widget != null) {
					widget.ResetAndUpdateAnchors ();
					widget.Update ();
				}
			}
		}
		for (int i = 0; i < tr.childCount; i++) {
			updateAll (tr.GetChild (i));
		}
	}

	public static bool isIphonex() {
	#if UNITY_IOS
		#if UNITY_2017_1_OR_NEWER 
		var isIphoneX = UnityEngine.iOS.Device.generation;  
		if (isIphoneX == UnityEngine.iOS.DeviceGeneration.iPhoneX)  
		{  
			return true;
		}
		#else
		string mode = SystemInfo.deviceModel;
		if(mode.Contains("iPhone10,3") || mode.Contains("iPhone10,6")) {
			return true;
		}
		#endif
	#elif UNITY_EDITOR
		if((int)(screenSize.x) == 1624) {
			return true;
		} else {
			return false;
		}
	#endif
		return false;
	}	

	static bool _isFringe = false;
	public static bool isFringe {		// 刘海屏
		get {
			return _isFringe || isIphonex ();
		}
		set {
			_isFringe = value;
		}
	}

	static float _rateFringe = 1;
	public static float rateFringe {
		get {
			if (isFringe) {
				return 734f / 812f;
			} else {
				return _rateFringe;
			}
		}
		set {
			_rateFringe = value;
		}
	}

	public static Vector4 _offsetRect;
	public static Vector4 offsetRect
    {
		get
		{
			if (_offsetRect == null)
			{
				float left = Screen.safeArea.x;
				float right = Screen.width - Screen.safeArea.width - left;
				float top = Screen.safeArea.y;
				float bottom = Screen.height - Screen.safeArea.height - top;

				_offsetRect = new Vector4(left/Screen.width, top / Screen.height, right / Screen.width, bottom / Screen.height);
			}
			return _offsetRect;
		}
		set{
			_offsetRect = value;
        }
    }

	public static Rect wrapRect4Fringe(GameObject go, Rect rect) {
		//if (isFringe) {
		//	if (rect.width > rect.height) {
		//		float offsetWidth = rect.width * (1 - rateFringe);
		//		return new Rect ((int)(offsetWidth / 2), 0, rect.width - offsetWidth, rect.height);
		//	} else {
		//		float offsetHight = rect.height * (1 - rateFringe);
		//		return new Rect (0, (int)(offsetHight / 2), rect.width, rect.height - offsetHight);
		//	}
		//} else {
		//	return rect;
		//}
		Vector4 offset = offsetRect;
		float left = rect.width * offset.x;
		float right = rect.width * offset.z;
		float top = rect.height * offset.y;
		float bottom = rect.height * offset.w;
		rect.x += left;
        rect.width -= (left + right);
        rect.y += bottom;
        rect.height -= (top + bottom);
        return rect;
	}
	#endregion
}