tooltipcomboboxexample.java

来自「tame,扩展了好多SWing组件:JTable」· Java 代码 · 共 62 行

/* (swing1.1.1beta2) swing#1785 */
package tame.examples;

import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

/**
@author Nobuo Tamemasa
@version 1.0 06/05/99
*/
public class ToolTipComboBoxExample extends JFrame {

  String[] items    = {"jw"       ,"ja"       ,"la"    };
  String[] tooltips = {"Javanese ","Japanese ","Latin "};

  public ToolTipComboBoxExample() {
    super("ToolTip ComboBox Example");

    JComboBox combo = new JComboBox(items);
    combo.setRenderer(new MyComboBoxRenderer());

    getContentPane().setLayout(new FlowLayout());
    getContentPane().add(combo);
  }

  class MyComboBoxRenderer extends BasicComboBoxRenderer {
    public Component getListCellRendererComponent( JList list,
           Object value, int index, boolean isSelected, boolean cellHasFocus) {
      if (isSelected) {
        setBackground(list.getSelectionBackground());
        setForeground(list.getSelectionForeground());
        if (-1 < index) {
          list.setToolTipText(tooltips[index]);
        }
      } else {
        setBackground(list.getBackground());
        setForeground(list.getForeground());
      }
      setFont(list.getFont());
      setText((value == null) ? "" : value.toString());
      return this;
    }
  }

  public static void main (String args[]) {
    ToolTipComboBoxExample frame = new ToolTipComboBoxExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
	System.exit(0);
      }
    });
    frame.setSize(200, 140);
    frame.setVisible(true);
  }
}