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103 lines
2.8 KiB
Java
103 lines
2.8 KiB
Java
Auto Complete JComboBox
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import java.awt.*;
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import java.awt.event.*;
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import java.util.*;
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import javax.swing.*;
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import javax.swing.text.*;
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public class AutoComplete extends JComboBox implements JComboBox.KeySelectionManager
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{
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private String searchFor;
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private long lap;
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public class CBDocument extends PlainDocument
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{
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public void insertString(int offset, String str, AttributeSet a) throws BadLocationException
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{
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if (str==null) return;
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super.insertString(offset, str, a);
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if(!isPopupVisible() && str.length() != 0) fireActionEvent();
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}
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}
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public AutoComplete(Object[] items)
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{
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super(items);
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lap = new java.util.Date().getTime();
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setKeySelectionManager(this);
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JTextField tf;
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if(getEditor() != null)
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{
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tf = (JTextField)getEditor().getEditorComponent();
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if(tf != null)
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{
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tf.setDocument(new CBDocument());
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addActionListener(new ActionListener()
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{
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public void actionPerformed(ActionEvent evt)
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{
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JTextField tf = (JTextField)getEditor().getEditorComponent();
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String text = tf.getText();
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ComboBoxModel aModel = getModel();
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String current;
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for(int i = 0; i < aModel.getSize(); i++)
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{
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current = aModel.getElementAt(i).toString();
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if(current.toLowerCase().startsWith(text.toLowerCase()))
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{
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tf.setText(current);
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tf.setSelectionStart(text.length());
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tf.setSelectionEnd(current.length());
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break;
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}
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}
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}
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});
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}
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}
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}
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public int selectionForKey(char aKey, ComboBoxModel aModel)
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{
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long now = new java.util.Date().getTime();
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if (searchFor!=null && aKey==KeyEvent.VK_BACK_SPACE && searchFor.length()>0)
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{
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searchFor = searchFor.substring(0, searchFor.length() -1);
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}
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else
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{
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// System.out.println(lap);
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// Kam nie hier vorbei.
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if(lap + 1000 < now)
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searchFor = "" + aKey;
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else
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searchFor = searchFor + aKey;
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}
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lap = now;
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String current;
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for(int i = 0; i < aModel.getSize(); i++)
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{
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current = aModel.getElementAt(i).toString().toLowerCase();
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if (current.toLowerCase().startsWith(searchFor.toLowerCase())) return i;
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}
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return -1;
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}
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public void fireActionEvent()
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{
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super.fireActionEvent();
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}
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public static void main(String arg[])
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{
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JFrame f = new JFrame("AutoCompleteComboBox");
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f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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f.setSize(200,300);
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Container cp= f.getContentPane();
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cp.setLayout(null);
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//String[] names= {"Beate", "Claudia", "Fjodor", "Fred", "Friedrich", "Fritz", "Frodo", "Hermann", "Willi"};
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//JComboBox cBox= new AutoComplete(names);
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Locale[] locales = Locale.getAvailableLocales();//
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JComboBox cBox= new AutoComplete(locales);
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cBox.setBounds(50,50,100,21);
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cBox.setEditable(true);
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cp.add(cBox);
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f.setVisible(true);
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}
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}
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