Ember: Call Action on Input Field on Focus Out with Argument

I'm creating a simple Todo App as I explore EmberJS v2.14. I want to build in a manual inline editing feature--the user will double-click on a todo line item text span, to open up a input field. The user will then edit the todo, which will be double bound to a backing object. And then when focus is lost, the app will re-close the input field back to the newly edited text.

The following fragment of code is inside an block helper, and it almost works.

   <span ></span>

  

Working Pieces

• I can double click to go to editing mode (i.e. openForEditing() is correctly called with the write argument.)
• the action handler closeForEditing() is correctly called when focus is lost from the input field.

Pieces Not Working

• I don't know how to pass the todo object model as an argument, so that the closeForEditing() handler can do the appropriate work of setting isOpenForEdit back to false.

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Q) How do I pass an argument to an action handler while working with the input helper?

Q) Is there a different approach I can take, to achieve my goal?