source: trunk/gli/src/org/greenstone/gatherer/gui/GComboBox.java@ 4428

package org.greenstone.gatherer.gui;
/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * <BR><BR>
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;
import org.greenstone.gatherer.Gatherer;

/**
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version
 */
public class GComboBox
    extends JComboBox {

    private Color background = null;
    private Color foreground = null;
    private Color selection_background = null;
    private Color selection_foreground = null;

    private Model model;

    public GComboBox() {
    super();
    init();
    }

    public GComboBox(Gatherer gatherer) {
    this();
    }

    public GComboBox(ArrayList data) {
    super(data.toArray());
    init();
    }

    public GComboBox(ComboBoxModel model) {
    super(model);
    init();
    }

    public GComboBox(Object data[]) {
    super(data);
    init();
    }

    public GComboBox(Vector data) {
    super(data);
    init();
    }

    public int add(Object object) {
    return model.add(object);
    }

    public Object get(int index) {
    return model.getElementAt(index);
    }

    public int getMaximumRowCount() {
    int size = model.getSize();
    if(size == 0) {
        return 1;
    }
    else if(size < maximumRowCount) {
        return model.getSize();
    }
    return maximumRowCount;
    }

    public void clear() {
    model.clear();
    }

    public int count() {
    return model.getSize();
    }

    public void setBackgroundNonSelectionColor(Color background) {
    this.background = background;
    setEditor(new Editor());
    setRenderer(new Renderer());
    }

    public void setTextNonSelectionColor(Color foreground) {
    this.foreground = foreground;
    setEditor(new Editor());
    setRenderer(new Renderer());
    }

    public void setBackgroundSelectionColor(Color selection_background) {
    this.selection_background = selection_background;
    setEditor(new Editor());
    setRenderer(new Renderer());
    }

    public void setTextSelectionColor(Color selection_foreground) {
    this.selection_foreground = selection_foreground;
    setEditor(new Editor());
    setRenderer(new Renderer());
    }

    public void init() {
    this.model = new Model();
    ComboBoxModel old_model = (ComboBoxModel) getModel();
    setModel(model);
    // Restore any data given into our model
    for(int i = 0; i < old_model.getSize(); i++) {
        model.add(old_model.getElementAt(i));
    }
    // Change component
    UI ui = new UI();
    setUI(ui);
    ui.setBackground(Color.white);
    // Initialization
    this.background = Gatherer.config.getColor("coloring.collection_tree_background", false);
    this.foreground = Gatherer.config.getColor("coloring.collection_tree_foreground", false);
    this.selection_background = Gatherer.config.getColor("coloring.collection_selection_background", false);
    this.selection_foreground = Gatherer.config.getColor("coloring.collection_selection_foreground", false);
    setEditor(new Editor());
    setRenderer(new Renderer());
    }

    private class Editor
    extends JTextField
    implements ComboBoxEditor {
    public Editor() {
        setBackground(background);
        setForeground(foreground);
        setSelectionColor(selection_background); 
        setSelectedTextColor(selection_foreground);
    }

    public Component getEditorComponent() {
        return this;
    }

    public Object getItem() {
        return getText();
    }

    public void setItem(Object item) {
        if(item != null) {
        setText(item.toString());
        }
        else {
        setText("");
        }
    }
    }

    private class Model
    extends DefaultComboBoxModel {

    public int add(Object extension) {
        int position = 0;
        String extension_str = extension.toString().toLowerCase();
        while(extension != null && position < size()) {
        String sibling = getElementAt(position).toString().toLowerCase();
        int order = extension_str.compareTo(sibling);
        // If we are now less than the sibling, insert here.
        if(order < 0) {
            insertElementAt(extension, position);
            extension = null;
        }
        // We are equal to the sibling, thus we already exist in list. Done.
        else if(order == 0) {
            extension = null;
        }
        // Continue searching.
        else {
            position++;
        }
        }
        if(extension != null) {
        position = size();
        addElement(extension);
        }
        return position;
    }

    public void clear() {
        removeAllElements();
    }

    public int size() {
        return getSize();
    }
    }

    private class Renderer 
    extends JLabel 
    implements ListCellRenderer {
    public Renderer() {
    }
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
        if(value != null) {
        setText(value.toString());
        }
        else {
        setText("");
        }
        setBackground(isSelected ? selection_background : background);
        setForeground(isSelected ? selection_foreground : foreground);
        setOpaque(true);
        return this;
    }
    }

    private class UI
    extends BasicComboBoxUI {
    public UI() {
        super();
    }

    protected ComboPopup createPopup() {
        BasicComboPopup popup = new BasicComboPopup( comboBox ) {
            public void show() {
            if(comboBox.getMaximumRowCount() > 0) {
                Dimension popupSize = new Dimension( comboBox.getWidth(), getPopupHeightForRowCount( comboBox.getMaximumRowCount()));
                Rectangle popupBounds = new Rectangle( 0, 0, popupSize.width, popupSize.height);
                scroller.setMaximumSize( popupBounds.getSize() );
                scroller.setPreferredSize( popupBounds.getSize() );
                scroller.setMinimumSize( popupBounds.getSize() );
                list.invalidate();            
                int selectedIndex = comboBox.getSelectedIndex();
                if ( selectedIndex == -1 ) {
                list.clearSelection();
                } 
                else {
                list.setSelectedIndex( selectedIndex );
                }            
                list.ensureIndexIsVisible( list.getSelectedIndex() );
                setLightWeightPopupEnabled( comboBox.isLightWeightPopupEnabled() );
                show(arrowButton, arrowButton.getSize().width - (popupSize.width + 4), arrowButton.getSize().height);
            }
            }
        };
        popup.getAccessibleContext().setAccessibleParent(comboBox);
        return popup;
    }

    public void setBackground(Color background) {
        arrowButton.setBackground(background);
    }
    }
}