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