com.unity.uiextensions/Runtime/Scripts/Controls/Accordion/AccordionElement.cs

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///Credit ChoMPHi
///Sourced from - http://forum.unity3d.com/threads/accordion-type-layout.271818/
using System;
using UnityEngine.UI.Extensions.Tweens;
namespace UnityEngine.UI.Extensions
{
[RequireComponent(typeof(RectTransform), typeof(LayoutElement))]
[AddComponentMenu("UI/Extensions/Accordion/Accordion Element")]
public class AccordionElement : Toggle
{
[SerializeField] private float m_MinHeight = 18f;
public float MinHeight => m_MinHeight;
[SerializeField] private float m_MinWidth = 40f;
public float MinWidth => m_MinWidth;
private Accordion m_Accordion;
private RectTransform m_RectTransform;
private LayoutElement m_LayoutElement;
[NonSerialized]
private readonly TweenRunner<FloatTween> m_FloatTweenRunner;
protected AccordionElement()
{
if (this.m_FloatTweenRunner == null)
this.m_FloatTweenRunner = new TweenRunner<FloatTween>();
this.m_FloatTweenRunner.Init(this);
}
protected override void Awake()
{
base.Awake();
base.transition = Transition.None;
base.toggleTransition = ToggleTransition.None;
this.m_Accordion = this.gameObject.GetComponentInParent<Accordion>();
this.m_RectTransform = this.transform as RectTransform;
this.m_LayoutElement = this.gameObject.GetComponent<LayoutElement>();
this.onValueChanged.AddListener(OnValueChanged);
}
#if UNITY_EDITOR
protected override void OnValidate()
{
base.OnValidate();
this.m_Accordion = this.gameObject.GetComponentInParent<Accordion>();
if (this.group == null)
{
ToggleGroup tg = this.GetComponentInParent<ToggleGroup>();
if (tg != null)
{
this.group = tg;
}
}
LayoutElement le = this.gameObject.GetComponent<LayoutElement>();
if (le != null)
{
if (this.isOn)
{
if (m_Accordion.ExpandVerticval)
{
le.preferredHeight = -1f;
}
else
{
le.preferredWidth = -1f;
}
}
else
{
if (m_Accordion.ExpandVerticval)
{
le.preferredHeight = this.m_MinHeight;
}
else
{
le.preferredWidth = this.m_MinWidth;
}
}
}
}
#endif
public void OnValueChanged(bool state)
{
if (this.m_LayoutElement == null)
return;
Accordion.Transition transition = (this.m_Accordion != null) ? this.m_Accordion.transition : Accordion.Transition.Instant;
if (transition == Accordion.Transition.Instant)
{
if (state)
{
if (m_Accordion.ExpandVerticval)
{
this.m_LayoutElement.preferredHeight = -1f;
}
else
{
this.m_LayoutElement.preferredWidth = -1f;
}
}
else
{
if (m_Accordion.ExpandVerticval)
{
this.m_LayoutElement.preferredHeight = this.m_MinHeight;
}
else
{
this.m_LayoutElement.preferredWidth = this.m_MinWidth;
}
}
}
else if (transition == Accordion.Transition.Tween)
{
if (state)
{
if (m_Accordion.ExpandVerticval)
{
this.StartTween(this.m_MinHeight, this.GetExpandedHeight());
}
else
{
this.StartTween(this.m_MinWidth, this.GetExpandedWidth());
}
}
else
{
if (m_Accordion.ExpandVerticval)
{
this.StartTween(this.m_RectTransform.rect.height, this.m_MinHeight);
}
else
{
this.StartTween(this.m_RectTransform.rect.width, this.m_MinWidth);
}
}
}
}
protected float GetExpandedHeight()
{
if (this.m_LayoutElement == null)
return this.m_MinHeight;
float originalPrefH = this.m_LayoutElement.preferredHeight;
this.m_LayoutElement.preferredHeight = -1f;
float h = LayoutUtility.GetPreferredHeight(this.m_RectTransform);
this.m_LayoutElement.preferredHeight = originalPrefH;
return h;
}
protected float GetExpandedWidth()
{
if (this.m_LayoutElement == null)
return this.m_MinWidth;
float originalPrefW = this.m_LayoutElement.preferredWidth;
this.m_LayoutElement.preferredWidth = -1f;
float w = LayoutUtility.GetPreferredWidth(this.m_RectTransform);
this.m_LayoutElement.preferredWidth = originalPrefW;
return w;
}
protected void StartTween(float startFloat, float targetFloat)
{
float duration = (this.m_Accordion != null) ? this.m_Accordion.transitionDuration : 0.3f;
FloatTween info = new FloatTween
{
duration = duration,
startFloat = startFloat,
targetFloat = targetFloat
};
if (m_Accordion.ExpandVerticval)
{
info.AddOnChangedCallback(SetHeight);
}
else
{
info.AddOnChangedCallback(SetWidth);
}
info.ignoreTimeScale = true;
this.m_FloatTweenRunner.StartTween(info);
}
protected void SetHeight(float height)
{
if (this.m_LayoutElement == null)
return;
this.m_LayoutElement.preferredHeight = height;
}
protected void SetWidth(float width)
{
if (this.m_LayoutElement == null)
return;
this.m_LayoutElement.preferredWidth = width;
}
}
}