source: java-rpg-client/gamegui/ScrollList.java@ 92d1b2a

package gamegui;

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

public class ScrollList extends Member {
        private ArrayList<Listable> lstObjects;
        private Listable selectedItem;
        private Font font;
        private FontMetrics metrics;
        private int textStart;
        private boolean change;
        
        public ScrollList(String newName, int newX, int newY, int newWidth, int newHeight, Font font, FontMetrics metrics) {
                super(newName, newX, newY, newWidth, newHeight);
                
                lstObjects = new ArrayList<Listable>();
                selectedItem = null;
                this.font = font;
                this.metrics = metrics;
                textStart = 0;
                change = false;
        }
        
        public ArrayList<Listable> getList() {
                return lstObjects;
        }
        
        public Listable getSelected() {
                return selectedItem;
        }
        
        public boolean isChanged() {
                return change;
        }
        
        public void changeHandled() {
                change = false;
        }
        
        public void deselect() {
                selectedItem = null;
        }
        
        public void clear() {
                lstObjects = new ArrayList<Listable>();
                selectedItem = null;
                textStart = 0;
                changeHandled();
        }
        
        public boolean handleEvent(MouseEvent e) {
                if(getX() < e.getX() && e.getX() < getX()+getWidth()) {
                        if(getY() < e.getY() && getY()-textStart+2 < e.getY() && e.getY() < getY()+getHeight() && e.getY() < getY()+lstObjects.size()*15-textStart+2) {
                                selectedItem = lstObjects.get((e.getY()-getY()+textStart-2)/15);
                                change = true;
                                return true;
                        }
                }
                
                if(!getScrollBar().handleEvent(e))
                        return false;
                
                if(e.getY() < getY()+getScrollBar().getWidth()) {
                        changeTextStart(-30);
                }else if(getY()+getHeight()-getScrollBar().getWidth() < e.getY()) {
                        changeTextStart(30);
                }
                
                return true;
        }
        
        private void changeTextStart(int increment) {
                textStart += increment;
                
                if(lstObjects.size()*15+6>getHeight() && textStart >= lstObjects.size()*15+6-getHeight()) {
                        textStart = lstObjects.size()*15+6-getHeight();
                        getScrollBar().setPosition(getScrollBar().getMaxSize()-getScrollBar().getSize());
                }else if(textStart < 0 || lstObjects.size()*15+6<=getHeight()) {
                        textStart = 0;
                        getScrollBar().setPosition(0);
                }else
                        getScrollBar().setPosition(textStart*getScrollBar().getMaxSize()/(lstObjects.size()*15+6));
        }
        
        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();
        
        srcGraphics.setColor(Color.green);
                srcGraphics.setFont(font);
                
        for(int x=0; x<lstObjects.size(); x++) {
                if(selectedItem != null && selectedItem.equals(lstObjects.get(x))) {
                        srcGraphics.setColor(Color.blue);
                        srcGraphics.fillRect(0, x*15-textStart+3, getWidth(), 15);
                        srcGraphics.setColor(Color.green);
                }
                
                lstObjects.get(x).drawListString(5, metrics.getHeight()+x*15-textStart, srcGraphics);
        }
                
                g.drawImage(source, getX(), getY(), null);
                
                g.setColor(Color.red);
                g.drawRect(getX(), getY(), getWidth(), getHeight());
                
                if(lstObjects.size()*15+6 > getHeight())
                        getScrollBar().setSize(getScrollBar().getMaxSize()*getHeight()/(lstObjects.size()*15+6));
                else
                        getScrollBar().setSize(getScrollBar().getMaxSize());
                
                getScrollBar().draw(g);
        }
}