Input Events in the Editor

How can I have an Editor Utility Widget (Or similar) listen for inputs when I am using the editor. I am making some editor utilities, and need to listen for the Left Click, Right Click, and Mouse Wheel inputs.

Thanks!

I too would like to know this, specifically for Editor Utility Actor.

You are not able to do it only with a blueprint, but you can use this plugin that provided lots of features
https://github.com/HoussineMehnik/UE4-EditorScriptingToolsPlugin