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using UnityEngine.EventSystems;
namespace UnityEngine.UI
{
[AddComponentMenu("Layout/Aspect Ratio Fitter", 142)]
[ExecuteInEditMode]
[RequireComponent(typeof(RectTransform))]
[DisallowMultipleComponent]
public class AspectRatioFitter : UIBehaviour, ILayoutSelfController
{
public enum AspectMode { None, WidthControlsHeight, HeightControlsWidth, FitInParent, EnvelopeParent }
[SerializeField] private AspectMode m_AspectMode = AspectMode.None;
public AspectMode aspectMode { get { return m_AspectMode; } set { if (SetPropertyUtility.SetStruct(ref m_AspectMode, value)) SetDirty(); } }
[SerializeField] private float m_AspectRatio = 1;
public float aspectRatio { get { return m_AspectRatio; } set { if (SetPropertyUtility.SetStruct(ref m_AspectRatio, 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 AspectRatioFitter() {}
protected override void OnEnable()
{
base.OnEnable();
SetDirty();
}
protected override void OnDisable()
{
m_Tracker.Clear();
LayoutRebuilder.MarkLayoutForRebuild(rectTransform);
base.OnDisable();
}
protected override void OnRectTransformDimensionsChange()
{
UpdateRect();
}
private void UpdateRect()
{
if (!IsActive())
return;
m_Tracker.Clear();
switch (m_AspectMode)
{
#if UNITY_EDITOR
case AspectMode.None:
{
if (!Application.isPlaying)
m_AspectRatio = Mathf.Clamp(rectTransform.rect.width / rectTransform.rect.height, 0.001f, 1000f);
break;
}
#endif
case AspectMode.HeightControlsWidth:
{
m_Tracker.Add(this, rectTransform, DrivenTransformProperties.SizeDeltaX);
rectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, rectTransform.rect.height * m_AspectRatio);
break;
}
case AspectMode.WidthControlsHeight:
{
m_Tracker.Add(this, rectTransform, DrivenTransformProperties.SizeDeltaY);
rectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, rectTransform.rect.width / m_AspectRatio);
break;
}
case AspectMode.FitInParent:
case AspectMode.EnvelopeParent:
{
m_Tracker.Add(this, rectTransform,
DrivenTransformProperties.Anchors |
DrivenTransformProperties.AnchoredPosition |
DrivenTransformProperties.SizeDeltaX |
DrivenTransformProperties.SizeDeltaY);
rectTransform.anchorMin = Vector2.zero;
rectTransform.anchorMax = Vector2.one;
rectTransform.anchoredPosition = Vector2.zero;
Vector2 sizeDelta = Vector2.zero;
Vector2 parentSize = GetParentSize();
if ((parentSize.y * aspectRatio < parentSize.x) ^ (m_AspectMode == AspectMode.FitInParent))
{
sizeDelta.y = GetSizeDeltaToProduceSize(parentSize.x / aspectRatio, 1);
}
else
{
sizeDelta.x = GetSizeDeltaToProduceSize(parentSize.y * aspectRatio, 0);
}
rectTransform.sizeDelta = sizeDelta;
break;
}
}
}
private float GetSizeDeltaToProduceSize(float size, int axis)
{
return size - GetParentSize()[axis] * (rectTransform.anchorMax[axis] - rectTransform.anchorMin[axis]);
}
private Vector2 GetParentSize()
{
RectTransform parent = rectTransform.parent as RectTransform;
if (!parent)
return Vector2.zero;
return parent.rect.size;
}
public virtual void SetLayoutHorizontal() {}
public virtual void SetLayoutVertical() {}
protected void SetDirty()
{
UpdateRect();
}
#if UNITY_EDITOR
protected override void OnValidate()
{
m_AspectRatio = Mathf.Clamp(m_AspectRatio, 0.001f, 1000f);
SetDirty();
}
#endif
}
}
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