org.caleydo.core.view.opengl.layout2.basic.RadioController.java Source code

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Here is the source code for org.caleydo.core.view.opengl.layout2.basic.RadioController.java

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/*******************************************************************************
 * Caleydo - Visualization for Molecular Biology - http://caleydo.org
 * Copyright (c) The Caleydo Team. All rights reserved.
 * Licensed under the new BSD license, available at http://caleydo.org/license
 ******************************************************************************/
package org.caleydo.core.view.opengl.layout2.basic;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.caleydo.core.view.opengl.layout2.basic.GLButton.EButtonMode;

import com.google.common.collect.Iterators;

/**
 * a controller class for a bunch of {@link GLButton}s that act as a single radio group, i.e only one can be selected at
 * one time
 *
 * @author Samuel Gratzl
 *
 */
public class RadioController implements GLButton.ISelectionCallback, Iterable<GLButton> {
    private List<GLButton> buttons = new ArrayList<>();
    private int selected = 0;

    private GLButton.ISelectionCallback callback = GLButton.DUMMY_CALLBACK;

    public RadioController(GLButton.ISelectionCallback callback) {
        this.callback = callback;
    }

    public RadioController() {
    }

    @Override
    public Iterator<GLButton> iterator() {
        return Iterators.unmodifiableIterator(buttons.iterator());
    }

    /**
     * @param callback
     *            setter, see {@link callback}
     */
    public void setCallback(GLButton.ISelectionCallback callback) {
        if (callback == null)
            callback = GLButton.DUMMY_CALLBACK;
        this.callback = callback;
    }

    /**
     * adds another button to this controller
     *
     * @param b
     */
    public void add(GLButton b) {
        buttons.add(b);
        b.setMode(EButtonMode.BUTTON);
        b.setSelected(selected == (buttons.size() - 1));
        b.setCallback(this);
    }

    /**
     * sets the selected index
     *
     * @param index
     */
    public void setSelected(int index) {
        if (this.selected == index)
            return;
        int i = 0;
        for (GLButton b : buttons) {
            b.setCallback(null);
            b.setSelected((i++) == index);
            b.setCallback(this);
        }
        this.selected = index;
        callback.onSelectionChanged(index < 0 ? null : buttons.get(index), true);
    }

    /**
     * @return the selected, see {@link #selected}
     */
    public int getSelected() {
        return selected;
    }

    /**
     * 
     * @return the selected button or nul if nothing is selected
     */
    public GLButton getSelectedItem() {
        return selected < 0 || selected >= buttons.size() ? null : buttons.get(selected);
    }

    @Override
    public void onSelectionChanged(GLButton button, boolean selected) {
        int index = buttons.indexOf(button);
        if (this.selected == index)
            return;
        setSelected(index);
    }
}