swt combo 自动补全

public class AutoCompleteComboMain {

    static final Display display = new Display();

    static final Shell shell = new Shell(display);

    static String[] items = new String[] { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };

 

    public static void main(String[] args) {

        shell.setText("SWT");

        shell.setLayout(new GridLayout());

 

        Combo combo = new Combo(shell, SWT.BORDER);

        for (int i = 0; i < items.length; i++) {

            combo.add(items[i]);

        }

        ComboUtil.addAutoCompleteFeature(combo);

       

        shell.pack();

        shell.open();

        while (!shell.isDisposed()) {

            if (!display.readAndDispatch()) {

                display.sleep();

            }

        }

        display.dispose();

    }

}

关键的ComboUtil的代码如下：

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public class ComboUtil {     public static void addAutoCompleteFeature(Combo combo) {         // Add a key listener         combo.addKeyListener(new KeyAdapter() {             public void keyReleased(KeyEvent keyEvent) {                 Combo cmb = ((Combo) keyEvent.getSource());                 setClosestMatch(cmb);             }               // Move the highlight back by one character for backspace             public void keyPressed(KeyEvent keyEvent) {                 if (keyEvent.keyCode == SWT.BS) {                     Combo cmb = ((Combo) keyEvent.getSource());                     Point pt = cmb.getSelection();                     cmb.setSelection(new Point(Math.max(0, pt.x - 1), pt.y));                 }             }               private void setClosestMatch(Combo combo) {                 String str = combo.getText();                 String[] cItems = combo.getItems();                 // Find Item in Combo Items. If full match returns index                 int index = -1;                 for (int i = 0; i < cItems.length; i++) {                     if (cItems[i].toLowerCase().startsWith(str.toLowerCase())) {                         index = i;                         break;                     }                 }                   if (index != -1) {                     Point pt = combo.getSelection();                     combo.select(index);                     combo.setText(cItems[index]);                     combo.setSelection(new Point(pt.x, cItems[index].length()));                 }             }         });     }