Overview

This widget allows users to view the history of selections.

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 . It shows how a single item is to be defined and created.

• SelectionHistoryItem

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 must be inherited with abstract methods implemented.

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

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.