3.5 KiB
Android Components > Concept > Awesomebar
An abstract definition of an awesome bar component.
Usage
Setting up the dependency
Use Gradle to download the library from maven.mozilla.org (Setup repository):
implementation "org.mozilla.components:concept-awesomebar:{latest-version}"
Implementing an Awesome Bar
An Awesome Bar can be any Android View that implements the AwesomeBar interface.
An AwesomeBar implementation needs to react to the following events:
onInputStarted(): The user starts interacting with the awesome bar by entering text in the toolbar. This callback is a good place to initialize code that will be required once the user starts typing.onInputChanged(text: String): The user changed the text in the toolbar. The awesome bar implementation should update its suggestions based on the text entered now.onInputCancelled(): The user has cancelled their interaction with the awesome bar. This callback is a good place to free resources that are no longer needed.
The suggestions an awesome bar displays are provided by an SuggestionProvider. Those providers are passed by the app (or another component) to the awesome bar by calling addProviders(). Once the text changes the awesome bar queries the SuggestionProvider instances and receives a list of Suggestion objects.
Once the user selects a suggestion and the awesome bar wants to stop the interaction it can invoke the callback provided via the setOnStopListener() method. This is required as the awesome bar implementation is unaware of how it gets displayed and how interaction with it should be stopped (e.g. leaving the toolbar's editing mode).
Suggestions
A Suggestion object contains the data required to be displayed and callbacks for when a suggestion was selected by the user.
It is up to the suggestion or its provider to define the behavior that should happen in that situation (e.g. loading a URL, performing a search, switching tabs..).
All data in the Suggestion object is optional. It is up to the awesome bar implementation to handle missing data (e.g. show the description instead of a missing title).
Every Suggestion has an id. By default the Suggestion will generate a random ID. This ID can be used by the awesome bar to determine whether two suggestions are the same even though they are containing different/updated data. For example a Suggestion showing search suggestions from a search engine might use a constant ID when it is showing new search suggestions - to avoid the awesome bar implementation animating the previous suggestion leaving and a new suggestion appearing.
Implementing a Suggestion Provider
For implementing a Suggestion Provider the SuggestionProvider interface needs to be implemented. The awesome bar forwards the events it receives to every provider: onInputStarted(), onInputCancelled(), onInputChanged(text: String). A provider is required to return a list of Suggestion objects from onInputChanged(). This implementation can be synchronous. The awesome bar implementation takes care of performing the requests from worker threads.
License
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/