A component is treated as a layout element by the auto layout system if it implements ILayoutElement.
The layout system will invoke CalculateLayoutInputHorizontal before querying minWidth, preferredWidth, and flexibleWidth. It can potentially save performance if these properties are cached when CalculateLayoutInputHorizontal is invoked, so they don't need to be recalculated every time the properties are queried.
The layout system will invoke CalculateLayoutInputVertical before querying minHeight, preferredHeight, and flexibleHeight. It can potentially save performance if these properties are cached when CalculateLayoutInputVertical is invoked, so they don't need to be recalculated every time the properties are queried.The minWidth, preferredWidth, and flexibleWidth properties should not rely on any properties of the RectTransform of the layout element, otherwise the behavior will be non-deterministic. The minHeight, preferredHeight, and flexibleHeight properties may rely on horizontal aspects of the RectTransform, such as the width or the X component of the position. Any properties of the RectTransforms on child layout elements may always be relied on.See Also: Auto Layout.| flexibleHeight | The extra relative height this layout element should be allocated if there is additional available space. |
| flexibleWidth | The extra relative width this layout element should be allocated if there is additional available space. |
| layoutPriority | The layout priority of this component. |
| minHeight | The minimum height this layout element may be allocated. |
| minWidth | The minimum width this layout element may be allocated. |
| preferredHeight | The preferred height this layout element should be allocated if there is sufficient space. |
| preferredWidth | The preferred width this layout element should be allocated if there is sufficient space. |
| CalculateLayoutInputHorizontal | The minWidth, preferredWidth, and flexibleWidth values may be calculated in this callback. |
| CalculateLayoutInputVertical | The minHeight, preferredHeight, and flexibleHeight values may be calculated in this callback. |