// File: MoreComplexExampleSwing.java
// September 2017
//
// NOTE: A simple application that uses the mouse to draw.

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class MoreComplexExampleSwing extends JPanel implements ActionListener {

    // Store current location of mouse
    int currentX=0, currentY=0;

    public MoreComplexExampleSwing () 
    {
	this.addMouseListener (
           // Unusual syntax for anonymous classes:
           new MouseAdapter () {
  	       public void mousePressed (MouseEvent m)
	       {
		   System.out.println ("mousePressed event: " + m.paramString());
		   int x = m.getX();
		   int y = m.getY();
		   Graphics g = MoreComplexExampleSwing.this.getGraphics();
		   g.drawLine (currentX, currentY, x, y);
		   currentX = x;
		   currentY = y;
	       }
	   }
        );

	this.addMouseMotionListener (
           new MouseMotionAdapter () {
  	       public void mouseDragged (MouseEvent m)
	       {
		   System.out.println ("mouseDragged event: " + m.paramString());
		   int x = m.getX();
		   int y = m.getY();
		   Graphics g = MoreComplexExampleSwing.this.getGraphics();
		   g.drawLine (currentX, currentY, x, y);
		   currentX = x;
		   currentY = y;
	       }
	   }
       );

    }

    // Button-pressed events
    public void actionPerformed (ActionEvent a)
    {
	String eventDesc = a.getActionCommand();
	Color c = Color.gray;
	if (eventDesc.equalsIgnoreCase ("quit")) {
	    System.exit(0);
	}
	else if (eventDesc.equalsIgnoreCase ("red")) {
	    c = Color.red;
	}
	else if (eventDesc.equalsIgnoreCase ("blue")) {
	    c = Color.blue;
	}
	this.setBackground (c);
	this.repaint();
    }

    void buildGUI ()
    {
        JFrame frame = new JFrame ();
        frame.setSize (500, 500);
        Container cPane = frame.getContentPane();
        cPane.add (this, BorderLayout.CENTER);

	JPanel bottom = new JPanel ();

	Button qb = new Button ("Quit");
	qb.addActionListener (this);
	bottom.add (qb);

	Button rb = new Button ("Red");
	rb.addActionListener (this);
	bottom.add (rb);
	
	Button bb = new Button ("Blue");
	bb.addActionListener (this);
	bottom.add (bb);

	cPane.add (bottom, BorderLayout.SOUTH);
	
        frame.setVisible (true);
    }

    // To start execution, "main" is needed
    public static void main (String[] argv)
    {
	// Notice the unusual syntax:
	new MoreComplexExampleSwing().buildGUI();
    }

}