Source Code : Small Cell Combobox Example

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Small Cell Combobox Example

  
// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
/* (swing1.1) */


import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.event.ListDataEvent;
import javax.swing.plaf.basic.BasicComboPopup;
import javax.swing.plaf.basic.ComboPopup;
import javax.swing.plaf.metal.MetalComboBoxUI;
import javax.swing.table.DefaultTableModel;

/**
 * @version 1.0 3/06/99
 */
public class SmallCellComboExample extends JFrame {

  public SmallCellComboExample() {
    super("SmallCell Combo Example");

    DefaultTableModel dm = new DefaultTableModel(4, 10) {
      public void setValueAt(Object obj, int row, int col) {
        if (obj != null) {
          String str;
          if (obj instanceof String) {
            str = ((String) obj).substring(0, 2);
          } else {
            str = obj.toString();
          }
          super.setValueAt(str, row, col);
        }
      }
    };
    JTable table = new JTable(dm);

    String[] str = { "010 - To Time", "020 - Vacation", "030 - Feel Bad" };

    SteppedComboBox combo = new SteppedComboBox(str) {
      public void contentsChanged(ListDataEvent e) {
        selectedItemReminder = null;
        super.contentsChanged(e);
      }
    };

    Dimension d = combo.getPreferredSize();
    combo.setPopupWidth(d.width);

    DefaultCellEditor editor = new DefaultCellEditor(combo);
    table.setDefaultEditor(Object.class, editor);

    JScrollPane scroll = new JScrollPane(table);
    getContentPane().add(scroll, BorderLayout.CENTER);
  }

  public static void main(String[] args) {
    SmallCellComboExample frame = new SmallCellComboExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(300, 120);
    frame.setVisible(true);
  }
}

/**
 * @version 1.0 12/12/98
 */

class SteppedComboBoxUI extends MetalComboBoxUI {
  protected ComboPopup createPopup() {
    BasicComboPopup popup = new BasicComboPopup(comboBox) {

      public void show() {
        Dimension popupSize = ((SteppedComboBox) comboBox)
            .getPopupSize();
        popupSize
            .setSize(popupSize.width,
                getPopupHeightForRowCount(comboBox
                    .getMaximumRowCount()));
        Rectangle popupBounds = computePopupBounds(0, comboBox
            .getBounds().height, 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(comboBox, popupBounds.x, popupBounds.y);
      }
    };
    popup.getAccessibleContext().setAccessibleParent(comboBox);
    return popup;
  }
}

class SteppedComboBox extends JComboBox {
  protected int popupWidth;

  public SteppedComboBox(ComboBoxModel aModel) {
    super(aModel);
    setUI(new SteppedComboBoxUI());
    popupWidth = 0;
  }

  public SteppedComboBox(final Object[] items) {
    super(items);
    setUI(new SteppedComboBoxUI());
    popupWidth = 0;
  }

  public SteppedComboBox(Vector items) {
    super(items);
    setUI(new SteppedComboBoxUI());
    popupWidth = 0;
  }

  public void setPopupWidth(int width) {
    popupWidth = width;
  }

  public Dimension getPopupSize() {
    Dimension size = getSize();
    if (popupWidth < 1)
      popupWidth = size.width;
    return new Dimension(popupWidth, size.height);
  }
}




           
         
    
  

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