ListInput.java Source code

Introduction

Here is the source code for ListInput.java

Source

import java.awt.Dimension;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleRole;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.ListModel;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class ListInput extends JPanel implements ListSelectionListener, ActionListener {
    protected JLabel label;

    protected JTextField textfield;

    protected JList list;

    protected JScrollPane scrollPane;

    public ListInput(String[] data, String title) {
        setLayout(null);
        setBorder(new EmptyBorder(5, 5, 5, 5));
        label = new ListInputLabel(title, JLabel.LEFT);
        add(label);
        textfield = new ListInputText();
        textfield.addActionListener(this);
        label.setLabelFor(textfield); // NEW
        add(textfield);
        list = new ListInputList(data);
        list.setVisibleRowCount(4);
        list.addListSelectionListener(this);
        scrollPane = new JScrollPane(list);
        add(scrollPane);
    }

    public ListInput(String title, int numCols) {
        setLayout(null);
        setBorder(new EmptyBorder(5, 5, 5, 5));
        label = new ListInputLabel(title, JLabel.LEFT);
        add(label);
        textfield = new ListInputText(numCols);
        textfield.addActionListener(this);
        label.setLabelFor(textfield); // NEW
        add(textfield);
        list = new ListInputList();
        list.setVisibleRowCount(4);
        list.addListSelectionListener(this);
        scrollPane = new JScrollPane(list);
        add(scrollPane);
    }

    public void setToolTipText(String text) {
        super.setToolTipText(text);
        label.setToolTipText(text);
        textfield.setToolTipText(text);
        list.setToolTipText(text);
    }

    public void setDisplayedMnemonic(char ch) {
        label.setDisplayedMnemonic(ch);
    }

    public void setSelected(String sel) {
        list.setSelectedValue(sel, true);
        textfield.setText(sel);
    }

    public String getSelected() {
        return textfield.getText();
    }

    public void setSelectedInt(int value) {
        setSelected(Integer.toString(value));
    }

    public int getSelectedInt() {
        try {
            return Integer.parseInt(getSelected());
        } catch (NumberFormatException ex) {
            return -1;
        }
    }

    public void valueChanged(ListSelectionEvent e) {
        Object obj = list.getSelectedValue();
        if (obj != null)
            textfield.setText(obj.toString());
    }

    public void actionPerformed(ActionEvent e) {
        ListModel model = list.getModel();
        String key = textfield.getText().toLowerCase();
        for (int i = 0; i < model.getSize(); i++) {
            String data = (String) model.getElementAt(i);
            if (data.toLowerCase().startsWith(key)) {
                list.setSelectedValue(data, true);
                break;
            }
        }
    }

    public void addListSelectionListener(ListSelectionListener lst) {
        list.addListSelectionListener(lst);
    }

    public Dimension getPreferredSize() {
        Insets ins = getInsets();
        Dimension labelSize = label.getPreferredSize();
        Dimension textfieldSize = textfield.getPreferredSize();
        Dimension scrollPaneSize = scroll.getPreferredSize();
        int w = Math.max(Math.max(labelSize.width, textfieldSize.width), scrollPaneSize.width);
        int h = labelSize.height + textfieldSize.height + scrollPaneSize.height;
        return new Dimension(w + ins.left + ins.right, h + ins.top + ins.bottom);
    }

    public Dimension getMaximumSize() {
        return getPreferredSize();
    }

    public Dimension getMinimumSize() {
        return getPreferredSize();
    }

    public void doLayout() {
        Insets ins = getInsets();
        Dimension size = getSize();
        int x = ins.left;
        int y = ins.top;
        int w = size.width - ins.left - ins.right;
        int h = size.height - ins.top - ins.bottom;

        Dimension labelSize = label.getPreferredSize();
        label.setBounds(x, y, w, labelSize.height);
        y += labelSize.height;
        Dimension textfieldSize = textfield.getPreferredSize();
        textfield.setBounds(x, y, w, textfieldSize.height);
        y += textfieldSize.height;
        scrollPane.setBounds(x, y, w, h - y);
    }

    public void appendResultSet(ResultSet results, int index, boolean toTitleCase) {
        textfield.setText("");
        DefaultListModel model = new DefaultListModel();
        try {
            while (results.next()) {
                String str = results.getString(index);
                if (toTitleCase) {
                    str = Character.toUpperCase(str.charAt(0)) + str.substring(1);
                }

                model.addElement(str);
            }
        } catch (SQLException ex) {
            System.err.println("appendResultSet: " + ex.toString());
        }
        list.setModel(model);
        if (model.getSize() > 0)
            list.setSelectedIndex(0);
    }

    class ListInputLabel extends JLabel {
        public ListInputLabel(String text, int alignment) {
            super(text, alignment);
        }

        public AccessibleContext getAccessibleContext() {
            return ListInput.this.getAccessibleContext();
        }
    }

    class ListInputText extends JTextField {
        public ListInputText() {
        }

        public ListInputText(int numCols) {
            super(numCols);
        }

        public AccessibleContext getAccessibleContext() {
            return ListInput.this.getAccessibleContext();
        }
    }

    class ListInputList extends JList {
        public ListInputList() {
        }

        public ListInputList(String[] data) {
            super(data);
        }

        public AccessibleContext getAccessibleContext() {
            return ListInput.this.getAccessibleContext();
        }
    }

    // Accessibility Support
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null)
            accessibleContext = new AccessibleOpenList();
        return accessibleContext;
    }

    protected class AccessibleOpenList extends AccessibleJComponent {

        public String getAccessibleName() {
            System.out.println("getAccessibleName: " + accessibleName);
            if (accessibleName != null)
                return accessibleName;
            return label.getText();
        }

        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.LIST;
        }
    }

    public static void main(String[] a) {
        String[] fontNames = new String[] { "Roman", "Times Roman" };
        ListInput lstFontName = new ListInput(fontNames, "Name:");
        lstFontName.setDisplayedMnemonic('n');
        lstFontName.setToolTipText("Font name");
        JFrame f = new JFrame();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.getContentPane().add(lstFontName);
        f.pack();
        f.setSize(new Dimension(300, 200));
        f.show();

    }

}