DMDirc-Plugins/ui_swing/src/main/java/com/dmdirc/addons/ui_swing/framemanager/tree/TreeTreeScroller.java

/*
 * Copyright (c) 2006-2017 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
 * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.dmdirc.addons.ui_swing.framemanager.tree;

import com.dmdirc.addons.ui_swing.components.TreeScroller;
import com.dmdirc.addons.ui_swing.events.SwingActiveWindowChangeRequestEvent;
import com.dmdirc.addons.ui_swing.events.SwingEventBus;

import java.util.Optional;

import javax.swing.tree.TreePath;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Extension of TreeScroller to scroll the tree view.
 */
public class TreeTreeScroller extends TreeScroller {

    /** The swing event bus to post events to. */
    private final SwingEventBus eventBus;

    /**
     * Creates a new Tree scroller for the tree view.
     *
     * @param eventBus The swing event bus to post events to.
     * @param tree     Tree view tree
     */
    public TreeTreeScroller(final SwingEventBus eventBus,final Tree tree) {
        super(tree);
        this.eventBus = eventBus;
    }

    @Override
    protected void setPath(final TreePath path) {
        checkNotNull(path);
        checkNotNull(path.getLastPathComponent());
        checkNotNull(((TreeViewNode) path.getLastPathComponent()).getWindow());
        super.setPath(path);
        eventBus.publishAsync(new SwingActiveWindowChangeRequestEvent(
                Optional.ofNullable(((TreeViewNode) path.getLastPathComponent()).getWindow())));
    }

}