Accessible accessible = getAccessible();
accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
　public void getRole(AccessibleControlEvent e) {
　　int role = 0; int childID = e.childID;
　　if (childID == ACC.CHILDID_SELF) {
　　　role = ACC.ROLE_LIST; }
　　else if (childID >= 0 && childID < colors.size()) {
　　　role = ACC.ROLE_LISTITEM;
　　}
　　e.detail = role;
　}
　public void getValue(AccessibleControlEvent e){
　　int childID = e.childID;
　　if (childID == ACC.CHILDID_SELF) {
　　　e.result = getText();
　　}
　　else if (childID >= 0 && childID < colors.size()) {
　　　e.result = (String)colorNames.get(childID);
　　}
　}
　public void getChildAtPoint(AccessibleControlEvent e) {
　　Point testPoint = toControl(new Point(e.x, e.y));
　　int childID = ACC.CHILDID_NONE;
　　childID = (testPoint.y - cy)/lineHeight;
　　if (childID == ACC.CHILDID_NONE) {
　　　Rectangle location = getBounds();
　　　location.height = location.height - getClientArea().height;
　　　if (location.contains(testPoint)) {
　　　　childID = ACC.CHILDID_SELF;
　　　}
　　}
　　e.childID = childID;
　}
　public void getLocation(AccessibleControlEvent e) {
　　Rectangle location = null;
　　int childID = e.childID;
　　if (childID == ACC.CHILDID_SELF) {
　　　location = getBounds();
　　}
　　if (childID >= 0 && childID < colors.size()) {
　　　location = new Rectangle(cx,childID*lineHeight+cy,maxX,lineHeight);
　　}
　　if (location != null) {
　　　Point pt = toDisplay(new Point(location.x, location.y));
　　　e.x = pt.x;
　　　e.y = pt.y;
　　　e.width = location.width;
　　　e.height = location.height;
　　}
　}
　public void getChildCount(AccessibleControlEvent e) {
　　e.detail = colors.size();
　}
　public void getState(AccessibleControlEvent e) {
　　int state = 0;
　　int childID = e.childID;
　　if (childID == ACC.CHILDID_SELF) {
　　　state = ACC.STATE_NORMAL;
　　}
　　else if (childID >= 0 && childID < colors.size()) {
　　　state = ACC.STATE_SELECTABLE;
　　　if (isFocusControl()) {
　　　　state |= ACC.STATE_FOCUSABLE;
　　　}
　　　if (rowSel == childID) {
　　　　state |= ACC.STATE_SELECTED;
　　　　if (isFocusControl()) {
　　　　　state |= ACC.STATE_FOCUSED;
　　　　}
　　　}
　　}
　　e.detail = state;
　}
});
最后，我们需要提供一些方法方便程序员使用我们的控件。

public void setSelection(int index) {
if (index >= getItemCount() || index < 0)
return;
oldRowSel = rowSel;
rowSel = index;
selectionChanged();
}
public int getSelectionIndex() {
return rowSel;
}
public int getItemHeight() {
return lineHeight;
}
public void setItemHeight(int height) {
lineHeight = height;
}
public int getItemCount() {
return colors.size();
}
public void add(int colorIndex, String colorName) {
colorNames.add(colorName);
colors.add(new Integer(colorIndex));
}