1 files changed, 50 insertions, 0 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs
new file mode 100644
index 0000000..d0e1510
--- /dev/null
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs
@@ -0,0 +1,50 @@
+using UnityEngine;
+using System.Collections;
+
+namespace UnityEngine.UI
+{
+    public interface ILayoutElement
+    {
+#region LayoutGroup的派生类才会实现，其他ILayoutElement比如Image，Text不会实现
+        // After this method is invoked, layout horizontal input properties should return up-to-date values.
+        // Children will already have up-to-date layout horizontal inputs when this methods is called.
+        void CalculateLayoutInputHorizontal();
+        // After this method is invoked, layout vertical input properties should return up-to-date values.
+        // Children will already have up-to-date layout vertical inputs when this methods is called.
+        void CalculateLayoutInputVertical();
+#endregion
+
+        // Layout horizontal inputs
+        float minWidth { get; }
+        float preferredWidth { get; }
+        float flexibleWidth { get; }
+        // Layout vertical inputs
+        float minHeight { get; }
+        float preferredHeight { get; }
+        float flexibleHeight { get; }
+
+        int layoutPriority { get; }
+    }
+
+    public interface ILayoutController
+    {
+        void SetLayoutHorizontal();
+        void SetLayoutVertical();
+    }
+
+    // An ILayoutGroup component should drive the RectTransforms of its children.
+    public interface ILayoutGroup : ILayoutController
+    {
+    }
+
+    // An ILayoutSelfController component should drive its own RectTransform.
+    public interface ILayoutSelfController : ILayoutController
+    {
+    }
+
+    // An ILayoutIgnorer component is ignored by the auto-layout system.
+    public interface ILayoutIgnorer
+    {
+        bool ignoreLayout { get; }
+    }
+}