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You can take certain actions based on events and triggers.
ToolManagerDelegate exposes a number of delegate methods to allow a subscriber to be notified of events that are managed by the tools framework. There are a number of methods that allow you to modify the behaviour of the tools themselves. The methods discussed here are simple notifications, so that the app may coordinate as necessary.
This method is called when the tool changes, for example changing the "active" tool in a toolbar.
These methods are called just after an annotation is added, modified or deleted.
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