JComboBox: adding automatic completion-Ignore input that does not match : 组合框 « Swing组件 « Java

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Java 教程
Java » Swing组件 » 组合框屏幕截图 
JComboBox: adding automatic completion-Ignore input that does not match
JComboBox: adding automatic completion-Ignore input that does not match

//Code from: http://www.orbital-computer.de/JComboBox/
/*
Inside JComboBox: adding automatic completion

Author: Thomas Bierhance
        thomas@orbital-computer.de
*/

/*
Ignore input that does not match

If the user entered a key that does not match any item you get a NullPointerException. 
Of course this is not acceptable. A small enhancement in the insertString method will 
ignore 'invalid' input.
*/
import javax.swing.*;
import javax.swing.text.*;

public class S07IgnoreNoMatch extends PlainDocument {
    JComboBox comboBox;
    ComboBoxModel model;
    JTextComponent editor;
    // flag to indicate if setSelectedItem has been called
    // subsequent calls to remove/insertString should be ignored
    boolean selecting=false;
    
    public S07IgnoreNoMatch(final JComboBox comboBox) {
        this.comboBox = comboBox;
        model = comboBox.getModel();
        editor = (JTextComponentcomboBox.getEditor().getEditorComponent();
    }
    
    public void remove(int offs, int lenthrows BadLocationException {
        // return immediately when selecting an item
        if (selectingreturn;
        super.remove(offs, len);
    }
    
    public void insertString(int offs, String str, AttributeSet athrows BadLocationException {
        // return immediately when selecting an item
        if (selectingreturn;
        // insert the string into the document
        super.insertString(offs, str, a);
        // lookup and select a matching item
        Object item = lookupItem(getText(0, getLength()));
        if (item != null) {
            setSelectedItem(item);
        else {
            // keep old item selected if there is no match
            item = comboBox.getSelectedItem();
            // imitate no insert (later on offs will be incremented by str.length(): selection won't move forward)
            offs = offs-str.length();
            // provide feedback to the user that his input has been received but can not be accepted
            comboBox.getToolkit().beep()// when available use: UIManager.getLookAndFeel().provideErrorFeedback(comboBox);
        }
        setText(item.toString());
        // select the completed part
        highlightCompletedText(offs+str.length());
    }
    
    private void setText(String textthrows BadLocationException {
        // remove all text and insert the completed string
        super.remove(0, getLength());
        super.insertString(0, text, null);
    }
    
    private void highlightCompletedText(int start) {
        editor.setSelectionStart(start);
        editor.setSelectionEnd(getLength());
    }
    
    private void setSelectedItem(Object item) {
        selecting = true;
        model.setSelectedItem(item);
        selecting = false;
    }
    
    private Object lookupItem(String pattern) {
        Object selectedItem = model.getSelectedItem();
        // only search for a different item if the currently selected does not match
        if (selectedItem != null && startsWithIgnoreCase(selectedItem.toString(), pattern)) {
            return selectedItem;
        else {
            // iterate over all items
            for (int i=0, n=model.getSize(); i < n; i++) {
                Object currentItem = model.getElementAt(i);
                // current item starts with the pattern?
                if (startsWithIgnoreCase(currentItem.toString(), pattern)) {
                    return currentItem;
                }
            }
        }
        // no item starts with the pattern => return null
        System.out.println("No item matches pattern '" + pattern + "'");
        return null;
    }
    
    // checks if str1 starts with str2 - ignores case
    private boolean startsWithIgnoreCase(String str1, String str2) {
        return str1.toUpperCase().startsWith(str2.toUpperCase());
    }
    
    private static void createAndShowGUI() {
        // the combo box (add/modify items if you like to)
        JComboBox comboBox = new JComboBox(new Object[] {"Ester""Jordi""Jordina""Jorge""Sergi"});
        // has to be editable
        comboBox.setEditable(true);
        // get the combo boxes editor component
        JTextComponent editor = (JTextComponentcomboBox.getEditor().getEditorComponent();
        // change the editor's document
        editor.setDocument(new S07IgnoreNoMatch(comboBox));
        
        // create and show a window containing the combo box
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(3);
        frame.getContentPane().add(comboBox);
        frame.pack(); frame.setVisible(true);
    }
    
    
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}
           
       
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