source: last-defense/gamegui/ScrollBar.java

package gamegui;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;

public class ScrollBar extends Member {
    int size;
    int position;
    int scrollSpeed;
    boolean horizontal;
    
    public ScrollBar(final String newName, final int newX, final int newY, final int newWidth, final int newHeight, final int scrollSpeed, final boolean horizontal) {
        super(newName, newX, newY, newWidth, newHeight);
        this.size = 0;
        this.position = 0;
        this.scrollSpeed = scrollSpeed;
        this.horizontal = horizontal;
    }
    
    @Override
    public void clear() {
        this.size = 0;
        this.position = 0;
    }
    
    @Override
    public boolean handleEvent(final MouseEvent e) {
        final int x = e.getX();
        final int y = e.getY();
        if (this.horizontal) {
            if (this.getY() <= y && y <= this.getY() + this.getHeight()) {
                if (this.getX() <= x && x <= this.getX() + this.getHeight()) {
                    this.setPosition(this.position - this.scrollSpeed);
                    return true;
                }
                if (this.getX() + this.getWidth() - this.getHeight() <= x && x <= this.getX() + this.getWidth()) {
                    this.setPosition(this.position + this.scrollSpeed);
                    return true;
                }
            }
            return false;
        }
        if (this.getX() <= x && x <= this.getX() + this.getWidth()) {
            if (this.getY() <= y && y <= this.getY() + this.getWidth()) {
                this.setPosition(this.position - this.scrollSpeed);
                return true;
            }
            if (this.getY() + this.getHeight() - this.getWidth() <= y && y <= this.getY() + this.getHeight()) {
                this.setPosition(this.position + this.scrollSpeed);
                return true;
            }
        }
        return false;
    }
    
    @Override
    public void draw(final Graphics g) {
        g.setColor(Color.black);
        g.fillRect(this.getX(), this.getY(), this.getWidth(), this.getHeight());
        g.setColor(Color.red);
        g.drawRect(this.getX(), this.getY(), this.getWidth(), this.getHeight());
        if (this.horizontal) {
            g.drawLine(this.getX() + this.getHeight(), this.getY(), this.getX() + this.getHeight(), this.getY() + this.getHeight());
            g.drawLine(this.getX() + this.getWidth() - this.getHeight(), this.getY(), this.getX() + this.getWidth() - this.getHeight(), this.getY() + this.getHeight());
            g.drawLine(this.getX() + this.getHeight() + this.position, this.getY(), this.getX() + this.getHeight() + this.position, this.getY() + this.getHeight());
            g.drawLine(this.getX() + this.getHeight() + this.position + this.size, this.getY(), this.getX() + this.getHeight() + this.position + this.size, this.getY() + this.getHeight());
            g.drawLine(this.getX() + this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 3 / 20, this.getX() + this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 17 / 20);
            g.drawLine(this.getX() + this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 17 / 20, this.getX() + this.getHeight() * 3 / 20, this.getY() + this.getHeight() / 2);
            g.drawLine(this.getX() + this.getHeight() * 3 / 20, this.getY() + this.getHeight() / 2, this.getX() + this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 3 / 20);
            g.drawLine(this.getX() + this.getWidth() - this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 3 / 20, this.getX() + this.getWidth() - this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 17 / 20);
            g.drawLine(this.getX() + this.getWidth() - this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 17 / 20, this.getX() + this.getWidth() - this.getHeight() * 3 / 20, this.getY() + this.getHeight() / 2);
            g.drawLine(this.getX() + this.getWidth() - this.getHeight() * 3 / 20, this.getY() + this.getHeight() / 2, this.getX() + this.getWidth() - this.getHeight() * 17 / 20, this.getY() + this.getHeight() * 3 / 20);
        } else {
            g.drawLine(this.getX(), this.getY() + this.getWidth(), this.getX() + this.getWidth(), this.getY() + this.getWidth());
            g.drawLine(this.getX(), this.getY() + this.getHeight() - this.getWidth(), this.getX() + this.getWidth(), this.getY() + this.getHeight() - this.getWidth());
            g.drawLine(this.getX(), this.getY() + this.getWidth() + this.position, this.getX() + this.getWidth(), this.getY() + this.getWidth() + this.position);
            g.drawLine(this.getX(), this.getY() + this.getWidth() + this.position + this.size, this.getX() + this.getWidth(), this.getY() + this.getWidth() + this.position + this.size);
            g.drawLine(this.getX() + this.getWidth() * 3 / 20, this.getY() + this.getWidth() * 17 / 20, this.getX() + this.getWidth() * 17 / 20, this.getY() + this.getWidth() * 17 / 20);
            g.drawLine(this.getX() + this.getWidth() * 17 / 20, this.getY() + this.getWidth() * 17 / 20, this.getX() + this.getWidth() / 2, this.getY() + this.getWidth() * 3 / 20);
            g.drawLine(this.getX() + this.getWidth() / 2, this.getY() + this.getWidth() * 3 / 20, this.getX() + this.getWidth() * 3 / 20, this.getY() + this.getWidth() * 17 / 20);
            g.drawLine(this.getX() + this.getWidth() * 3 / 20, this.getY() + this.getHeight() - this.getWidth() * 17 / 20, this.getX() + this.getWidth() * 17 / 20, this.getY() + this.getHeight() - this.getWidth() * 17 / 20);
            g.drawLine(this.getX() + this.getWidth() * 17 / 20, this.getY() + this.getHeight() - this.getWidth() * 17 / 20, this.getX() + this.getWidth() / 2, this.getY() + this.getHeight() - this.getWidth() * 3 / 20);
            g.drawLine(this.getX() + this.getWidth() / 2, this.getY() + this.getHeight() - this.getWidth() * 3 / 20, this.getX() + this.getWidth() * 3 / 20, this.getY() + this.getHeight() - this.getWidth() * 17 / 20);
        }
    }
    
    public int getPosition() {
        return this.position;
    }
    
    public int getSize() {
        return this.size;
    }
    
    public int getMaxSize() {
        if (this.horizontal) {
            return this.getWidth() - 2 * this.getHeight();
        }
        return this.getHeight() - 2 * this.getWidth();
    }
    
    public void setPosition(final int position) {
        if (position > this.getMaxSize() - this.size) {
            this.position = this.getMaxSize() - this.size;
        } else if (position < 0) {
            this.position = 0;
        } else {
            this.position = position;
        }
    }
    
    public void setSize(final int size) {
        this.size = size;
    }
}