focus

Overview ¶

Package focus demonstrates a screen with multiple components sharing one keyboard, using pkg/focus to decide which of them has it.

A focus.Group holds the components in tab order and owns three things a hand-rolled index cannot do as well:

• tab / shift-tab cycling, including the blur-everything-focus-one dance
• granting focus to a component that was clicked, since the click arrives at the component rather than at the screen that knows the ordering
• answering IsCapturingKeys from whichever component currently has focus

The screen still routes messages itself, because focus is about the keyboard and not about content: keys go to the focused component only — otherwise typing in the query would also drive the list's cursor — while mouse events go to every component, so each can test the click against its own rect and claim it if it landed inside.