source: java-rpg-client/gamegui/MultiTextbox.java

package gamegui;

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.util.*;

public class MultiTextbox extends Textbox {
        ArrayList<String> lstStrings;
        FontMetrics metrics;
        boolean active;
        
        public MultiTextbox(String newName, int newX, int newY, int newWidth, int newHeight, String newLabel, boolean isActive, Font newFont, FontMetrics newMetrics) {
                super(newName, newX, newY, newWidth, newHeight, newLabel, newFont, false);
        
                lstStrings = new ArrayList<String>();
                metrics = newMetrics;
                active = isActive;
                
                splitString();
        }
        
        public void append(String str) {
                if(getText().equals(""))
                        setText(str);
                else
                        setText(getText() + "\n" + str);
                
                splitString();
                
                if(lstStrings.size()*15+6 > getHeight())
                        getScrollBar().setSize(getScrollBar().getMaxSize()*getHeight()/(lstStrings.size()*15+6));
                else
                        getScrollBar().setSize(getScrollBar().getMaxSize());
        
                getScrollBar().setPosition(getScrollBar().getMaxSize()-getScrollBar().getSize());
        }
        
        public void clear() {
                super.clear();
                lstStrings = new ArrayList<String>();
        }

        public boolean handleEvent(MouseEvent e) {
                if(!getScrollBar().handleEvent(e))
                        return false;
                
                if(e.getY() < getY()+getWidth()) {
                        changeTextStart(-30);
                }else if(getY()+getHeight()-getWidth() < e.getY()) {
                        changeTextStart(30);
                }
                
                return true;
        }
        
        public void handleEvent(KeyEvent e) {
                if(!active)
                        return;
                
                super.handleEvent(e);
                
                splitString();
                
                if(lstStrings.size()*15+6 > getHeight())
                        getScrollBar().setSize(getScrollBar().getMaxSize()*getHeight()/(lstStrings.size()*15+6));
                else
                        getScrollBar().setSize(getScrollBar().getMaxSize());
        
                getScrollBar().setPosition(getScrollBar().getMaxSize()-getScrollBar().getSize());
        }
        
        private void changeTextStart(int increment) {
                setTextStart(getTextStart()+increment);
                
                if(lstStrings.size()*15+6>getHeight() && getTextStart() >= lstStrings.size()*15+6-getHeight()) {
                        setTextStart(lstStrings.size()*15+6-getHeight());
                        getScrollBar().setPosition(getScrollBar().getMaxSize()-getScrollBar().getSize());
                }else if(getTextStart() < 0 || lstStrings.size()*15+6<=getHeight()) {
                        setTextStart(0);
                        getScrollBar().setPosition(0);
                }else
                        getScrollBar().setPosition(getTextStart()*getScrollBar().getMaxSize()/(lstStrings.size()*15+6));
        }

        private void splitString() {
                String drawnString = getText();
                
                ArrayList<String> lstTemp = new ArrayList<String>();
        do {
                int x = 0;
                while(x<drawnString.length() && metrics.stringWidth(drawnString.substring(0, x+1))<=getWidth()-10 && !drawnString.substring(x, x+1).equals("\n")) {
                        x++;
                }
                
                lstTemp.add(drawnString.substring(0, x));
                
                if(drawnString.length()>x && drawnString.substring(x, x+1).equals("\n"))
                        drawnString = drawnString.substring(x+1);
                else
                        drawnString = drawnString.substring(x);
        }while(metrics.stringWidth(drawnString)>0);
                
        if(lstTemp.size()*15-getHeight()+6 > 0)
                setTextStart(lstTemp.size()*15-getHeight()+6);
        else
                setTextStart(0);
        
        lstStrings = lstTemp;
        }
        
        public void draw(Graphics g) {
                GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice device = env.getDefaultScreenDevice();
        GraphicsConfiguration gc = device.getDefaultConfiguration();
        
        BufferedImage source = gc.createCompatibleImage(getWidth(), getHeight());
        Graphics2D srcGraphics = source.createGraphics();
        
        if(isSelected() && System.currentTimeMillis() - getLastCursorChange() > getBlinkInterval())
                {
                        if(getCursorState() == 0)
                                setCursorState(1);
                        else
                                setCursorState(0);
                        
                        setLastCursorChange(System.currentTimeMillis());
                }
        
        srcGraphics.setColor(Color.green);
                srcGraphics.setFont(getFont());
        
        int x;
        for(x=0; x<lstStrings.size(); x++)
                srcGraphics.drawString(lstStrings.get(x), 5, metrics.getHeight()+x*15-getTextStart());

        x--;
        if(isSelected() && getCursorState() == 1)
                        srcGraphics.drawLine(metrics.stringWidth(lstStrings.get(x))+6, 5+x*15-getTextStart(), metrics.stringWidth(lstStrings.get(x))+6, metrics.getHeight()+x*15-getTextStart());
        
                g.setColor(Color.green);
                g.setFont(getFont());
                
                g.drawImage(source, getX(), getY(), null);
                g.drawString(getLabel(), getX() - metrics.stringWidth(getLabel()) - 10, getY() + (getHeight() + metrics.getHeight())/2 - 2);
                
                g.setColor(Color.red);
                g.drawRect(getX(), getY(), getWidth(), getHeight());
                
                getScrollBar().draw(g);
        }
}