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using UnityEngine.EventSystems;
namespace UnityEngine.UI
{
[AddComponentMenu("Layout/Content Size Fitter", 141)]
[ExecuteInEditMode]
[RequireComponent(typeof(RectTransform))]
public class ContentSizeFitter : UIBehaviour, ILayoutSelfController
{
public enum FitMode
{
Unconstrained,
MinSize,
PreferredSize
}
[SerializeField] protected FitMode m_HorizontalFit = FitMode.Unconstrained;
public FitMode horizontalFit { get { return m_HorizontalFit; } set { if (SetPropertyUtility.SetStruct(ref m_HorizontalFit, value)) SetDirty(); } }
[SerializeField] protected FitMode m_VerticalFit = FitMode.Unconstrained;
public FitMode verticalFit { get { return m_VerticalFit; } set { if (SetPropertyUtility.SetStruct(ref m_VerticalFit, value)) SetDirty(); } }
[System.NonSerialized] private RectTransform m_Rect;
private RectTransform rectTransform
{
get
{
if (m_Rect == null)
m_Rect = GetComponent<RectTransform>();
return m_Rect;
}
}
private DrivenRectTransformTracker m_Tracker;
protected ContentSizeFitter()
{}
protected override void OnEnable()
{
base.OnEnable();
SetDirty();
}
protected override void OnDisable()
{
m_Tracker.Clear();
LayoutRebuilder.MarkLayoutForRebuild(rectTransform);
base.OnDisable();
}
protected override void OnRectTransformDimensionsChange()
{
SetDirty();
}
private void HandleSelfFittingAlongAxis(int axis)
{
FitMode fitting = (axis == 0 ? horizontalFit : verticalFit);
if (fitting == FitMode.Unconstrained)
{
// Keep a reference to the tracked transform, but don't control its properties:
m_Tracker.Add(this, rectTransform, DrivenTransformProperties.None);
return;
}
m_Tracker.Add(this, rectTransform, (axis == 0 ? DrivenTransformProperties.SizeDeltaX : DrivenTransformProperties.SizeDeltaY));
// Set size to min or preferred size
if (fitting == FitMode.MinSize)
rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)axis, LayoutUtility.GetMinSize(m_Rect, axis));
else
rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)axis, LayoutUtility.GetPreferredSize(m_Rect, axis));
}
public virtual void SetLayoutHorizontal()
{
m_Tracker.Clear();
HandleSelfFittingAlongAxis(0);
}
public virtual void SetLayoutVertical()
{
HandleSelfFittingAlongAxis(1);
}
protected void SetDirty()
{
if (!IsActive())
return;
LayoutRebuilder.MarkLayoutForRebuild(rectTransform);
}
#if UNITY_EDITOR
protected override void OnValidate()
{
SetDirty();
}
#endif
}
}
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