choiceelement.java

J2ME上的一个播放器,可以更换皮肤.开源软件.

package inline.ui.le;

import javax.microedition.lcdui.*;
import inline.ui.ce.CanvasElement;

    public class ChoiceElement extends ListElement
    {
        protected String text;
	protected String[] textvalues;
	protected int[] pkeys;
	protected int selected;
        
        public ChoiceElement(String txt, String[] tvalues, int[] ppkeys, int ssel)
        {
            text = txt;
	    textvalues = tvalues;
	    pkeys = ppkeys;
	    selected = ssel;
	    
	    if (pkeys!=null) // in this case ssel is pkeys value
	    {
		moveSelected();
	    }
	    
        }
        
	private void moveSelected()
	{
	    for(int i=0;i<textvalues.length;i++)
	    {
	        if (pkeys[i] == selected ||
		    (i<(textvalues.length-1)
			&&
			(selected >= pkeys[i] && selected < pkeys[i+1] )))
		    {
			selected = i;
			break;
		    }
	    }

	    // escape danger
	    if (selected>=textvalues.length) selected = textvalues.length-1;
	    if (selected<0) selected = 0;
	}
	
	public boolean keyPressedElement(int keyCode, CanvasElement parent)
	{
	    boolean ret = false;
	    if (keyCode == CanvasElement.LEFT)
	    {
		selected--;
		if (selected<0) selected = textvalues.length-1;
		ret = true;
	    }
	    else if (keyCode == CanvasElement.RIGHT)
	    {
		selected++;
		if (selected>=textvalues.length) selected = 0;
		ret = true;
	    }
		    
	    if (ret)
	    {
		parent.getParent().selectPreview(this);
	    }
	    
	    return ret;
	}
		
	public String getSelectedString()
	{
	    return textvalues[selected];
	}

	public boolean deliverKeys()
	{
	    return true;
	}
	
	public int getSelectedKey()
	{
	    if (pkeys!=null)
	    {
		return pkeys[selected];
	    }
	    else
	    {
		return 0;
	    }
	}

	public void setSelectedKey(int ssel)
	{
	    if (pkeys!=null)
	    {
		selected = ssel;
		moveSelected();
	    }
	}

	public String getString()
        {
	    return text + " < "+textvalues[selected]+" >";
        }
    }