package opusmicro.demos.canvas;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.TextBox;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
public class MenuMIDlet extends MIDlet{

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {}

	protected void pauseApp() {}

	protected void startApp() throws MIDletStateChangeException {
		Display.getDisplay(this).setCurrent(new MenuCanvas());
	}
}

class MenuCanvas extends Canvas{
   
    //selected變量標記了焦點位置
    private int selected = 0;
    private int preferWidth = -1;
    private int preferHeight = -1;
//    public static final int[] OPTIONS = {0,1};
    public static final String[] LABELS={"User Name","Password"};
   
    public MenuCanvas() {
//        selected = OPTIONS[0];
        //計算菜單選項的長度和高度值
        Font f = Font.getDefaultFont();
        for(int i = 0;i<LABELS.length;i++){
            int temp = f.stringWidth(LABELS[i]);
            if(temp > preferWidth){
                preferWidth = temp;
            }
        }
        preferWidth  = preferWidth + 2*8;
        preferHeight = f.getHeight()+2*4;
    }
   
    public void paint(Graphics g){
        //清除屏幕
        int color = g.getColor();
        g.setColor(0xFFFFFF);
        g.fillRect(0,0,getWidth(),getHeight());
        g.setColor(color);
        //計算整個菜單的高度，寬度和（x,y）
        int rectWidth = preferWidth;
        int rectHeight = preferHeight * LABELS.length;
        int x = (getWidth()-rectWidth)/2;
        int y = (getHeight()-rectHeight)/2;
        //畫矩形
        g.drawRect(x,y,rectWidth,rectHeight);
        for(int i = 1;i<LABELS.length;i++){
            g.drawLine(x,y+preferHeight*i,x+rectWidth,y+preferHeight*i);
        }
        //畫菜單選項，并根據selected的值判斷焦點
        for(int j = 0;j<LABELS.length;j++){
            if(selected == j){
                g.setColor(0x6699cc);
                g.fillRect(x+1,y+j*preferHeight+1,rectWidth-1,preferHeight-1);
                g.setColor(color);
            }
            g.drawString(LABELS[j],x+8,y+j*preferHeight+4,Graphics.LEFT|Graphics.TOP);
        }
    }
   public void enterContent(){
	   TextBox t = new TextBox("", null, preferHeight, preferHeight);
   }
    public void keyPressed(int keyCode){
        //根據用戶輸入更新selected的值，并重新繪制屏幕
        int action = this.getGameAction(keyCode);
        switch(action){
            case Canvas.FIRE:
                printLabel(selected);
                break;
            case Canvas.DOWN:
                selected = (selected+1)%2;
                break;
            case Canvas.UP:{
                if(--selected < 0){
                    selected+=2;
                }
                break;
            }
            default:
                break;
        }
        repaint();
        serviceRepaints();
    }
    //showNotify()在paint()之前被調用
    public void showNotify(){
        System.out.println("showNotify() is called");
    }
    private void printLabel(int selected){
        System.out.println(LABELS[selected]);
    }
   
}