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/*
* Copyright 2013 TecO - Karlsruhe Institute of Technology
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package squirrel.controller;
import squirrel.util.Range;
/**
* This class models some kind of EventBus. It keeps several
* {@link TrackController} synchronized by dispatching an event called
* on one of them to all the others.
* <p>
* It is possible to subscribe track controllers to groups, so certain events
* can be published to a selected group of subscribers.
*/
public interface TrackEventBus {
/**
* Subscribe a {@link TrackController} to a given {@code group}. This
* {@code subscriber} will from then on be notified whenever someone
* publishes an event to {@code group}.
*
* @param subscriber the instance to be subscribed.
* @param group the group said instance is subscribed to.
*/
void subscribe(TrackController subscriber, int group);
/**
* Publish a VisibleExcerptMoved event to group {@code group} with delta
* {@code delta}.
*
* @param publisher the instance publishing this event.
* @param group the group to publish to
* @param delta the delta the excerpt was moved by
*/
void publishVisibleExcerptMoved(TrackController trackController, int group, int delta);
/**
* Publish a ExcerptSelected event to group {@code group} with selected
* excerpt {@code selection}.
*
* @param publisher the instance publishing this event.
* @param group the group to publish to
* @param selection the selected excerpt
*/
void publishExcerptSelected(TrackController publisher, int group, Range selection);
/**
* Publish a SelectionCanceled event to group {@code group}.
*
* @param publisher the instance publishing this event.
* @param group the group to publish to
*/
void publishSelectionCanceled(TrackController publisher, int group);
/**
* Publish a ZoomStepChanged event to a group {@code group}.
*
* @param publisher the instance publishing this event.
* @param group the group to publish to.
* @param newPixelTimeRatio the new pixelTimeRatio.
*/
void publishZoomStepChanged(TrackController publisher, int group, double newPixelTimeRatio);
}