XgmComboBoxColor.java :  » ERP-CRM-Financial » Evaristo-4.0 » com » m16e » tools » xgm » colors » Java Open Source

/*
 * XgmComboBoxColor.java
 *
 * Created on 15 de Novembro de 2006, 17:04
 *
 */

package com.m16e.tools.xgm.colors;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.event.EventListenerList;

public class XgmComboBoxColor
{
  static class ColorCellRenderer implements ListCellRenderer
  {
    protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer();
    
    // width doesn't matter as combobox will size
    private final static Dimension preferredSize = new Dimension(0, 20);
    
    public Component getListCellRendererComponent(JList list, Object value,
      int index, boolean isSelected, boolean cellHasFocus)
    {
      JLabel renderer = (JLabel) defaultRenderer
        .getListCellRendererComponent(list, value, index,
        isSelected, cellHasFocus);
      if (value instanceof Color)
      {
        renderer.setBackground((Color) value);
      }
      renderer.setPreferredSize(preferredSize);
      return renderer;
    }
  }
  
  public static void main(String args[])
  {
    Color colors[] = { Color.black, Color.blue, Color.cyan, Color.darkGray,
    Color.gray, Color.green, Color.lightGray, Color.magenta,
    Color.orange, Color.pink, Color.red, Color.white, Color.yellow };
    JFrame frame = new JFrame("Color JComboBox");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();
    
    final JComboBox comboBox = new JComboBox(colors);
    comboBox.setMaximumRowCount(5);
    comboBox.setEditable(true);
    comboBox.setRenderer(new ColorCellRenderer());
    Color color = (Color) comboBox.getSelectedItem();
    ComboBoxEditor editor = new ColorComboBoxEditor(color);
    comboBox.setEditor(editor);
    contentPane.add(comboBox, BorderLayout.NORTH);
    
    final JLabel label = new JLabel();
    label.setOpaque(true);
    label.setBackground((Color) comboBox.getSelectedItem());
    contentPane.add(label, BorderLayout.CENTER);
    
    ActionListener actionListener = new ActionListener()
    {
      public void actionPerformed(ActionEvent actionEvent)
      {
        Color selectedColor = (Color) comboBox.getSelectedItem();
        label.setBackground(selectedColor);
      }
    };
    comboBox.addActionListener(actionListener);
    
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

class ColorComboBoxEditor implements ComboBoxEditor
{
  final protected JButton editor;
  
  transient protected EventListenerList listenerList = new EventListenerList();
  
  public ColorComboBoxEditor(Color initialColor)
  {
    editor = new JButton("");
    editor.setBackground(initialColor);
    ActionListener actionListener = new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        Color currentBackground = editor.getBackground();
        Color color = JColorChooser.showDialog(editor, "Color Chooser",
          currentBackground);
        if ((color != null) && (currentBackground != color))
        {
          editor.setBackground(color);
          fireActionEvent(color);
        }
      }
    };
    editor.addActionListener(actionListener);
  }
  
  public void addActionListener(ActionListener l)
  {
    listenerList.add(ActionListener.class, l);
  }
  
  public Component getEditorComponent()
  {
    return editor;
  }
  
  public Object getItem()
  {
    return editor.getBackground();
  }
  
  public void removeActionListener(ActionListener l)
  {
    listenerList.remove(ActionListener.class, l);
  }
  
  public void selectAll()
  {
    // ignore
  }
  
  public void setItem(Object newValue)
  {
    if (newValue instanceof Color)
    {
      Color color = (Color) newValue;
      editor.setBackground(color);
    }
    else
    {
      // Try to decode
      try
      {
        Color color = Color.decode(newValue.toString());
        editor.setBackground(color);
      }
      catch (NumberFormatException e)
      {
        // ignore - value unchanged
      }
    }
  }
  
  protected void fireActionEvent(Color color)
  {
    Object listeners[] = listenerList.getListenerList();
    for (int i = listeners.length - 2; i >= 0; i -= 2)
    {
      if (listeners[i] == ActionListener.class)
      {
        ActionEvent actionEvent = new ActionEvent(editor,
          ActionEvent.ACTION_PERFORMED, color.toString());
        ((ActionListener) listeners[i + 1])
        .actionPerformed(actionEvent);
      }
    }
  }
}