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using UnityEngine.EventSystems;
namespace UnityEngine.UI
{
[AddComponentMenu("Layout/Layout Element", 140)]
[RequireComponent(typeof(RectTransform))]
[ExecuteInEditMode]
public class LayoutElement : UIBehaviour, ILayoutElement, ILayoutIgnorer
{
[SerializeField] private bool m_IgnoreLayout = false;
[SerializeField] private float m_MinWidth = -1;
[SerializeField] private float m_MinHeight = -1;
[SerializeField] private float m_PreferredWidth = -1;
[SerializeField] private float m_PreferredHeight = -1;
[SerializeField] private float m_FlexibleWidth = -1;
[SerializeField] private float m_FlexibleHeight = -1;
[SerializeField] private int m_LayoutPriority = 1;
public virtual bool ignoreLayout { get { return m_IgnoreLayout; } set { if (SetPropertyUtility.SetStruct(ref m_IgnoreLayout, value)) SetDirty(); } }
public virtual void CalculateLayoutInputHorizontal() {}
public virtual void CalculateLayoutInputVertical() {}
public virtual float minWidth { get { return m_MinWidth; } set { if (SetPropertyUtility.SetStruct(ref m_MinWidth, value)) SetDirty(); } }
public virtual float minHeight { get { return m_MinHeight; } set { if (SetPropertyUtility.SetStruct(ref m_MinHeight, value)) SetDirty(); } }
public virtual float preferredWidth { get { return m_PreferredWidth; } set { if (SetPropertyUtility.SetStruct(ref m_PreferredWidth, value)) SetDirty(); } }
public virtual float preferredHeight { get { return m_PreferredHeight; } set { if (SetPropertyUtility.SetStruct(ref m_PreferredHeight, value)) SetDirty(); } }
public virtual float flexibleWidth { get { return m_FlexibleWidth; } set { if (SetPropertyUtility.SetStruct(ref m_FlexibleWidth, value)) SetDirty(); } }
public virtual float flexibleHeight { get { return m_FlexibleHeight; } set { if (SetPropertyUtility.SetStruct(ref m_FlexibleHeight, value)) SetDirty(); } }
public virtual int layoutPriority { get { return m_LayoutPriority; } set { if (SetPropertyUtility.SetStruct(ref m_LayoutPriority, value)) SetDirty(); } }
protected LayoutElement()
{}
protected override void OnEnable()
{
base.OnEnable();
SetDirty();
}
protected override void OnTransformParentChanged()
{
SetDirty();
}
protected override void OnDisable()
{
SetDirty();
base.OnDisable();
}
protected override void OnDidApplyAnimationProperties()
{
SetDirty();
}
protected override void OnBeforeTransformParentChanged()
{
SetDirty();
}
protected void SetDirty()
{
if (!IsActive())
return;
LayoutRebuilder.MarkLayoutForRebuild(transform as RectTransform);
}
#if UNITY_EDITOR
protected override void OnValidate()
{
SetDirty();
}
#endif
}
}
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