Fuchsia shortcut

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Overview

fuchsia.ui.shortcut provides information about activation of keyboard combinations.

At the moment, provides registering and notification APIs for “hotkey” shortcuts i.e. key + modifiers.

Scenic View hierarchy is used as a consolidated disambiguation mechanism. This also implies that a component should provide a ViewRef in order to use shortcuts manager API. Only focused components (i.e. ViewRef is on the Focus chain) are notified of the shortcut activation.

For the cases of shortcut conflicts (e.g. parent and child components both register CTRL + C shortcut listeners), the child component take precedence, unless parent uses special flag when registering for the shortcut (use_priority = true).

Full disambiguation procedure:

Only focused components participate
use_priority = true resolution step:
- Only shortcuts with use_priority = true participate
- Components are sorted in top-down order of Scenic View hierarchy, i.e. parent nodes first
- All components in that order receive the notification until one of them returns handled = true
- If handled, stop
use_priority = false resolution step:
- Only shortcuts with use_priority = false participate
- Components are sorted in lowest-first order of Scenic View hierarchy, i.e. child nodes first
- All components in that order receive the notification until one of them returns handled = true