source: lost-perception/gamegui/TabbedWindow.java

package gamegui;

import java.awt.FontMetrics;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.Font;
import java.util.ArrayList;

public class TabbedWindow extends Member {
    private ArrayList<Window> windows;
    private ArrayList<String> windowLabels;
    private Window activeWindow;
    private int tabHeight;
    private Font tabFont;
    
    public TabbedWindow(final String newName, final int newX, final int newY, final int newWidth, final int newHeight, final int newTabHeight, final Font newFont) {
        super(newName, newX, newY, newWidth, newHeight);
        this.windows = new ArrayList<Window>();
        this.windowLabels = new ArrayList<String>();
        this.tabHeight = newTabHeight;
        this.activeWindow = null;
        this.tabFont = newFont;
    }
    
    public void add(final Window newWindow, final String name) {
        newWindow.offset(this.getX(), this.getY() + this.tabHeight);
        if (this.activeWindow == null) {
            this.activeWindow = newWindow;
        }
        this.windows.add(newWindow);
        this.windowLabels.add(name);
    }
    
    @Override
    public void clear() {
        this.activeWindow = this.windows.get(0);
        for (int x = 0; x < this.windows.size(); ++x) {
            this.windows.get(x).clear();
        }
    }
    
    public void offset(final int xOffset, final int yOffset) {
        super.offset(xOffset, yOffset);
        for (int x = 0; x < this.windows.size(); ++x) {
            this.windows.get(x).offset(xOffset, yOffset);
        }
    }
    
    public Window getWindow(final String aName) {
        for (int x = 0; x < this.windows.size(); ++x) {
            if (this.windows.get(x).getName().equals(aName)) {
                return this.windows.get(x);
            }
        }
        return null;
    }
    
    @Override
    public boolean handleEvent(final MouseEvent e) {
        for (int x = 0; x < this.windows.size(); ++x) {
            if (this.isClicked(this.getX() + x * this.getWidth() / this.windows.size(), this.getY(), this.getWidth() / this.windows.size(), this.tabHeight, e.getX(), e.getY())) {
                this.activeWindow = this.windows.get(x);
                return true;
            }
        }
        return this.activeWindow.handleEvent(e);
    }
    
    private boolean isClicked(final int x, final int y, final int width, final int height, final int mouseX, final int mouseY) {
        return x <= mouseX && mouseX <= x + width && y <= mouseY && mouseY <= y + height;
    }
    
    @Override
    public void draw(final Graphics g) {
        final FontMetrics metrics = g.getFontMetrics(this.tabFont);
        g.setColor(Color.black);
        g.fillRect(this.getX(), this.getY(), this.getWidth(), this.getHeight());
        g.setFont(this.tabFont);
        for (int x = 0; x < this.windows.size(); ++x) {
            g.setColor(Color.green);
            g.drawString(this.windowLabels.get(x), this.getX() + x * this.getWidth() / this.windows.size() + (this.getWidth() / this.windows.size() - metrics.stringWidth(this.windowLabels.get(x))) / 2, this.getY() + (this.tabHeight + metrics.getHeight()) / 2 - 2);
            g.setColor(Color.red);
            g.drawLine(this.getX() + x * this.getWidth() / this.windows.size(), this.getY(), this.getX() + x * this.getWidth() / this.windows.size(), this.getY() + this.tabHeight);
            if (this.windows.get(x).equals(this.activeWindow)) {
                this.windows.get(x).draw(g);
                g.setColor(Color.red);
                g.drawRect(this.getX(), this.getY(), this.getWidth(), this.getHeight());
                g.drawLine(this.getX(), this.getY() + this.tabHeight, this.getX() + x * this.getWidth() / this.windows.size(), this.getY() + this.tabHeight);
                g.drawLine(this.getX() + (x + 1) * this.getWidth() / this.windows.size(), this.getY() + this.tabHeight, this.getX() + this.getWidth(), this.getY() + this.tabHeight);
            }
        }
    }
    
    public String getActive() {
        if (this.activeWindow != null) {
            return this.activeWindow.getName();
        }
        return "";
    }
}