Overview

This widget allows users to visualize and edit the different layers in the USD context.

Implementation

The widget uses multiple components:

• an item class

• a model class

• a delegate class

Item class

the ItemBase class inherits directly from ui.AbstractItem but should not be used directly. Instead, the children classes should be used to display items in the tree:

• LayerItem

These items are the structures that will be used in the delegate to display UI items on screen.

Model class

This class inherits from ui.AbstractItemModel and can be used directly as it implements all the important methods required to display the information.

The ui.TreeView uses the model class to populate the tree. The class holds all the items of type ItemBase mentioned in the “Item class” section.

The model class listens to Layer events and will refresh the widget whenever a change occurs.

Delegate class

This class inherits from ui.AbstractItemDelegate. The delegate will define how the ItemBase items should be displayed in terms of UI. The existing delegate can be overridden or replaced completely depending on your needs.