.#menuelementcomboshift.java.1.2

国外的j2me播放器软件

package no.auc.one.portableplayer.userinterface;

import java.util.Vector;
import javax.microedition.lcdui.Graphics;

/**
 * MenuElement which displays it's children at it's name tag, 
 * instead of normal browsing.
 */
public class MenuElementComboShift extends MenuElementContainer {
    private int currentChildIndex = 0;
    
    public MenuElementComboShift(String name) {
        super(name);
    }

    public MenuElementComboShift(
        String name, 
        MenuEventListener listener,
        MenuElement[] children) 
    {
        super(name, listener, children);
    }

    // XXX To be deprecated!
    public int getCurrentIndex() {
        return currentChildIndex;
    }
    
    // XXX To be deprecated!
    public MenuElement getCurrentChild() {
        return (MenuElement)children.elementAt(currentChildIndex);
    }

    public void paint(Graphics g) {
        // Draw "name:" at the left and "childname" at the right

        g.drawString(
            name + ":",
            g.getClipX(),
            g.getClipY(),
            Graphics.TOP | Graphics.LEFT);

        if (children != null && children.size() > 0) {
            // Should change the clip
            g.setClip(
                g.getClipX() + 100, 
                g.getClipY(), 
                g.getClipWidth(), 
                g.getClipHeight());
            
            g.drawString(
                ((MenuElement)children.elementAt(
                    currentChildIndex)).toString() + " <->",
                g.getClipWidth(), // - g.getClipX(),
                g.getClipY(),
                Graphics.TOP | Graphics.RIGHT);
        }
    }

    public void invokeAction() {
        if (children.size() > 0) {
            System.out.println("Invoke action of current child");
            ((MenuElement)children.elementAt(
                currentChildIndex)).invokeAction();
        }
    }

    public boolean prepareNavigateLeft() {
        if (currentChildIndex > 0) {
            currentChildIndex--;
        } else {
            currentChildIndex = (children.size() - 1);
        }

        return false;
    }

    public boolean prepareNavigateRight() {
        if (currentChildIndex < (children.size() - 1)) {
            currentChildIndex++;
        } else {
            currentChildIndex = 0;
        }

        return false;
    }
}