filterhistoryjlist.java

oraily的Swing hacks code

import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
import java.util.*;

public class FilterHistoryJList extends JList {

    private FilterField filterField;
    private int DEFAULT_FIELD_WIDTH = 20;

    public FilterHistoryJList() {
        super();
        setModel (new FilterModel());
        filterField = new FilterField (DEFAULT_FIELD_WIDTH);
        filterField.textField.requestFocus();
    }

    public void setModel (ListModel m) {
        if (! (m instanceof FilterModel))
            throw new IllegalArgumentException();
        super.setModel (m);
    }

    public void addItem (Object o) {
        ((FilterModel)getModel()).addElement (o);
    }

    public FilterField getFilterField() {
        return filterField;
    }

    // test filter list
    public static void main (String[] args) {
        String[] listItems = {
            "Chris", "Joshua", "Daniel", "Michael",
            "Don", "Kimi", "Kelly", "Keagan"
        };
        JFrame frame = new JFrame ("FilterHistoryJList");
        frame.getContentPane().setLayout (new BorderLayout());
        // populate list
        FilterHistoryJList list = new FilterHistoryJList();
        for (int i=0; i<listItems.length; i++)
            list.addItem (listItems[i]);
        // add to gui
        JScrollPane pane =
            new JScrollPane (list,
                             ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
                             ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        frame.getContentPane().add (pane, BorderLayout.CENTER);
        FilterField filterField = list.getFilterField();
        frame.getContentPane().add (filterField, BorderLayout.NORTH);
        frame.pack();
        frame.setVisible(true);
        filterField.textField.requestFocus();
    }

    // inner class to provide filtered model
    class FilterModel extends AbstractListModel {
        ArrayList items;
        ArrayList filterItems;
        public FilterModel() {
            super();
            items = new ArrayList();
            filterItems = new ArrayList();
        }
        public Object getElementAt (int index) {
            if (index < filterItems.size())
                return filterItems.get (index);
            else
                return null;
        }
        public int getSize() {
            return filterItems.size();
        }
        public void addElement (Object o) {
            items.add (o);
            refilter();
        }
        private void refilter() {
            filterItems.clear();
            String term = getFilterField().textField.getText();
            for (int i=0; i<items.size(); i++)
                if (items.get(i).toString().indexOf(term, 0) != -1)
                    filterItems.add (items.get(i));
            fireContentsChanged (this, 0, getSize());
        }
    }

    // inner class provides filter-by-keystroke field
    class FilterField extends JComponent
        implements DocumentListener, ActionListener {
        LinkedList prevSearches;
        JTextField textField;
        JButton prevSearchButton;
        JPopupMenu prevSearchMenu;
        public FilterField (int width) {
            super();
            setLayout(new BorderLayout());
            textField = new JTextField (width);
            textField.getDocument().addDocumentListener (this);
            textField.addActionListener (this);
            prevSearchButton = new JButton (new ImageIcon ("mag-glass.png"));
            prevSearchButton.setBorder(null);
            prevSearchButton.addMouseListener (new MouseAdapter() {
                    public void mousePressed (MouseEvent me) {
                        popMenu (me.getX(), me.getY());
                    }
                });
            add (prevSearchButton, BorderLayout.WEST);
            add (textField, BorderLayout.CENTER);
            prevSearches = new LinkedList ();
        }
        public void popMenu (int x, int y) {
            prevSearchMenu = new JPopupMenu();
            Iterator it = prevSearches.iterator();
            while (it.hasNext())
                prevSearchMenu.add (new PrevSearchAction(it.next().toString()));
            prevSearchMenu.show (prevSearchButton, x, y);
        }
        public void actionPerformed (ActionEvent e) {
            // called on return/enter, adds term to prevSearches
            if (e.getSource() == textField) {
                prevSearches.addFirst (textField.getText());
                if (prevSearches.size() > 10)
                    prevSearches.removeLast();
            } 
        }
        public void changedUpdate (DocumentEvent e) {((FilterModel)getModel()).refilter(); }
        public void insertUpdate (DocumentEvent e) {((FilterModel)getModel()).refilter(); }
        public void removeUpdate (DocumentEvent e) {((FilterModel)getModel()).refilter(); }
    }
    
    class PrevSearchAction extends AbstractAction {
        String term;
        public PrevSearchAction (String s) {
            term = s;
            putValue (Action.NAME, term);
        }
        public String toString() { return term; }
        public void actionPerformed (ActionEvent e) {
            getFilterField().textField.setText (term);
            // don't need this - setText fires a DocumentEvent
            // that FilterField handles
            // ((FilterModel)getModel()).refilter();
        }
    }
}