/*
* Copyright 2013-2014 TECO - Karlsruhe Institute of Technology.
*
* This file is part of TACET.
*
* TACET is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* TACET is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with TACET. If not, see <http://www.gnu.org/licenses/>.
*/
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);
}