Unity Action API
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Application which has different views needs to manage it actions based on the currently active view; not all of the actions supported by the application might be relevant or applicable on all of the views.
Therefore Unity Action API provides action contexts; a context groups actions together and by providing multiple contexts the developer is able to control the visibility of the actions. The ActionManager then exposes the actions from these different contexts.
Each application has one global context; the actions in this context are always available. The application may have one or more additional local context of which only one can be active at a time. The ActionManager merges the global context and the active local context together; the actions available at any given time is the union of the global context and the active local context.
For applications that do not require multiple contexts using the API is straight forward as the ActionManager provides the global context automatically.
First, create the Action:
And add it to the ActionManager:
myAction is now added to the global context.
When multiple contexts are needed the developer creates suitable number of ActionContext objects, adds the actions to the contexts, adds the contexts to the manager and sets the active one.
Setting the active context must be managed by the developer. The can only be one active local context at a time.
Create the local actions:
Create the local contexts:
Add the local actions to the contexts:
Add the local contexts to the manager:
Manage the active context by setting the active property on any of them:
Setting an another context active later will inactivate the previously active one.
The complete example: