com.algorithmstudy.visualizer.client.sort.SortingSubSelectionPanel.java Source code

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Here is the source code for com.algorithmstudy.visualizer.client.sort.SortingSubSelectionPanel.java

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/*
 * Copyright (C) 2009 The Algorithm Study Project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2.0 as published by the Free Software Foundation.
 *
 * This program 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 version
 * 2.0 along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 * or find it on the GNU website at:
 *
 *    http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */
package com.algorithmstudy.visualizer.client.sort;

import com.google.gwt.user.client.ui.ChangeListener;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;

public class SortingSubSelectionPanel extends HorizontalPanel {

    private SortingDisplayPanel displayPanel;

    private ListBox numberChoice;
    private int lastNumberChoice;

    private ListBox alg1Choice;
    private int lastAlg1Choice;

    private ListBox alg2Choice;
    private int lastAlg2Choice;

    public SortingSubSelectionPanel(SortingDisplayPanel displayPanel) {
        this.displayPanel = displayPanel;

        setHorizontalAlignment(HorizontalPanel.ALIGN_LEFT);

        // Set up the number choice
        numberChoice = new ListBox();
        numberChoice.addItem("Show One");
        numberChoice.addItem("Compare Two");
        this.add(numberChoice);

        numberChoice.addChangeListener(new ChangeListener() {
            public void onChange(Widget w) {
                numberChoiceChange(w);
            }
        });

        lastNumberChoice = 0;

        createAlgChoice1ListBox();
    }

    private void createAlgChoice1ListBox() {
        alg1Choice = createAlgChoiceListBox();
        this.add(alg1Choice);

        alg1Choice.addChangeListener(new ChangeListener() {
            public void onChange(Widget w) {
                alg1ChoiceChange(w);
            }
        });

        lastAlg1Choice = 0;
    }

    private void createAlgChoice2ListBox() {
        alg2Choice = createAlgChoiceListBox();
        alg2Choice.setSelectedIndex(1);
        this.add(alg2Choice);

        alg2Choice.addChangeListener(new ChangeListener() {
            public void onChange(Widget w) {
                alg2ChoiceChange(w);
            }
        });

        lastAlg2Choice = 1;
    }

    private ListBox createAlgChoiceListBox() {
        ListBox algChoice = new ListBox();
        algChoice.addItem(SortAlgorithmType.getTypeByIndex(0).getDescription());
        algChoice.addItem(SortAlgorithmType.getTypeByIndex(1).getDescription());
        algChoice.addItem(SortAlgorithmType.getTypeByIndex(2).getDescription());
        algChoice.addItem(SortAlgorithmType.getTypeByIndex(3).getDescription());
        return algChoice;
    }

    private void alg1ChoiceChange(Widget w) {
        if (!alg1Choice.equals(w)) {
            return;
        }

        if (alg1Choice.getSelectedIndex() == lastAlg1Choice) {
            return;
        }

        lastAlg1Choice = alg1Choice.getSelectedIndex();
        displayPanel.setVisualizerAlgorithm(SortingDisplayPanel.VisualizerIndex.First,
                SortAlgorithmType.getTypeByIndex(lastAlg1Choice));
    }

    private void alg2ChoiceChange(Widget w) {
        if (!alg2Choice.equals(w)) {
            return;
        }

        if (alg2Choice.getSelectedIndex() == lastAlg2Choice) {
            return;
        }

        lastAlg2Choice = alg2Choice.getSelectedIndex();
        displayPanel.setVisualizerAlgorithm(SortingDisplayPanel.VisualizerIndex.Second,
                SortAlgorithmType.getTypeByIndex(lastAlg2Choice));
    }

    /**
     * Called when the selected number of algorithms to display is changed.
     * 
     * @param w
     */
    private void numberChoiceChange(Widget w) {
        if (!numberChoice.equals(w)) {
            return;
        }

        int selected = numberChoice.getSelectedIndex();
        if (lastNumberChoice == selected) {
            return;
        }

        if (0 == selected) {
            clearForReuse();
            createAlgChoice1ListBox();

            displayPanel.reinit(SortingDisplayPanel.VisualizerIndex.First, SortAlgorithmType.BubbleSort, null);
        } else {
            clearForReuse();
            createAlgChoice1ListBox();
            createAlgChoice2ListBox();

            displayPanel.reinit(SortingDisplayPanel.VisualizerIndex.Second, SortAlgorithmType.BubbleSort,
                    SortAlgorithmType.InsertionSort);
        }

        lastNumberChoice = selected;
    }

    private void clearForReuse() {
        for (int i = getWidgetCount() - 1; i > 0; i--) {
            remove(i);
        }
    }

}