/*
 * Copyright 1999,2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package peaklau.eaglefund;


import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Graphics;


/**
 * ScrollScreen class
 * 
 * This class can display text with vertical scroll bar.<br>
 * The line numbers will show on the top title.<br>
 * 
 * <br>
 *  
 *  
 * @author peaklau <br>
 *         email:<A HREF="mailto:peaklau@hotmail.com">peaklau@hotmail.com</A> <br>
 *         <a href="http://www.peaklau.com/fund/english/">HomePage</a> 
 * @version $Revision: 1.1 $ $Date: 2007/05/09 16:07:04 $
 */

public class ScrollScreen extends TitleScreen implements CommandListener {
    private int SCREEN_LINE_COUNT=0;
    
    private String[] lines=null;
    private int startLine=0;
    private int lineCount=0;
    private String title="";    

    /**
     * 
     * @param title
     * @param txt xxxx\r\n<RGB>xxxx\r\nbbbbbbbbb
     * @param backDisplayable
     * @param navigator
     */
    public ScrollScreen(String title,String txt,String backDisplayable,INavigator navigator){
        super(title,backDisplayable,navigator);
        this.title=title;
        setTxt(txt);
        SCREEN_LINE_COUNT=(height-2*Line_HIGHT-1)/FONT_HEIGHT;
    }

    public void setTxt(String txt){
        if(txt!=null){
            lineCount=1;
            int index=0;
            while((index=txt.indexOf("\r\n",index))>0){
                index+=2;
                lineCount++;
            }            
            lines=new String[lineCount];
            index=0;
            int tmp=0;
            for(int i=0;i<lineCount;i++){
                tmp=txt.indexOf("\r\n",index);
                if(tmp>0){
                    lines[i]=txt.substring(index,tmp);
                }else{
                    lines[i]=txt.substring(index);
                    break;
                }
                index=tmp+2;
            }
            
        }else{
            lineCount=0;
            txt="";
        }
        repaint();
    }
	
    private int getLineColor(int index){
        //System.out.println("getLineColor index="+index+"  startLine="+startLine);
        if((index+startLine)>=lineCount){
            return 0x00000000;
        }
        String tmp=lines[index+startLine].toLowerCase();
        if(tmp.indexOf("<")>=0){
            int color=0;
            for(int i=1;i<9;i++){
                char c=tmp.charAt(i);
                if((c>='a')&&(c<='f')){
                    color=color*16+(int)c-96+9;
                }else{
                    color=color*16+(int)c-48;
                }
            }
            //System.out.println(color);
            return color;
        }else{
            return 0x00000000;
        }
    }
    
    private String getLine(int index){
        //System.out.println("getLine index="+index+"  startLine="+startLine);
        if((index+startLine)>=lineCount){
            return "";
        }
        String tmp=lines[index+startLine];
        if(tmp.indexOf("<")>=0){
            tmp=tmp.substring(10);
        }
        return tmp;
    }
    
    
    public void showNotify(){
        if(startLine>=lineCount){
            startLine=0;
        }
        super.showNotify();
    }
    public void hideNotify(){        
        super.hideNotify();
    }
    
    
	protected void paint(Graphics g){
        int sstartLine=startLine+1;
        int eendLine=(startLine+1+SCREEN_LINE_COUNT)>lineCount?lineCount:(startLine+1+SCREEN_LINE_COUNT);
        setTitle(title+"("+sstartLine+"/"+lineCount+"-"+eendLine+"/"+lineCount+")");
        super.paint(g);
        
        //txt
        for(int i=0;i<SCREEN_LINE_COUNT;i++){
            g.setColor(getLineColor(i));
            g.drawString(getLine(i),0,Line_HIGHT*(i+1),Graphics.LEFT|Graphics.TOP);
        }        
	}
    
	protected void keyPressed(int keyCode) {
        super.keyPressed(keyCode);
		switch (getGameAction(keyCode)) {
        case LEFT:
		case UP:    
            if(startLine>0){
                startLine--;
            }
			repaint();
			break;
        case RIGHT:
		case DOWN:
            if(startLine<(lineCount-2)){
                startLine++;
            }
			repaint();
			break;
		default:
			break;			
		}
		
	}

}