TransformControls with custom gizmo object

Questions
1

I want to design custom gizmo handler for transform controls.

Is that possible

2

Yes. But you have to overwrite the default gizmo definitions of TransformControls. Fortunately, these definitions are some sort of a separate component which makes it easier to study what’s happening in the controls. The following code in TransformControls is relevant in this context:

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3

Is it possible to extend and overwrite this class instead of change in module?

4

I guess it depends on what part of the module you want to modify. If you want to rewrite a public method, extending should be no problem.