/*
 * EventHandlingFrameNoLayout.java
 *  similar to EventHandlingFrame.java, except lines indicated with *$*
 */

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

class EventHandlingFrameNoLayout extends JFrame 
{
	DrawingPanel mPanel;	
	JButton mResetButton, mQuitButton, mEnlargeButton;
	JComboBox mComboBox;
		
	EventHandlingFrameNoLayout(String title) {
		super(title);
	    setSize(400, 425);
	    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // when cross at top right is pressed
		Container container = getContentPane();
		container.setLayout(null); // *$* no layout

		mPanel = new DrawingPanel();
		mPanel.setBounds(0, 0, 400, 300); // *$* for position & size
		container.add(mPanel); // *$* 

		Color colors[] = {Color.red, Color.blue, Color.black, Color.yellow};
		mComboBox = new JComboBox(colors); // the colors are shown by string descriptions
		mComboBox.setBounds(180, 310, 200, 30); // *$*
		container.add(mComboBox); // *$* 

		mEnlargeButton = new JButton("Enlarge Figure");
		mEnlargeButton.setBounds(30, 310, 120, 30); // *$*
		container.add(mEnlargeButton); // *$* 

		mResetButton = new JButton("Reset");
		mResetButton.setBounds(40, 350, 100, 30); // *$*
		container.add(mResetButton); // *$* 

		mQuitButton = new JButton("Quit");
		mQuitButton.setBounds(230, 350, 100, 30); // *$*
		container.add(mQuitButton); // *$* 

		//       EVENT HANDLING		
	   	// ** Event Delegation Method 2a. **    
	 	mEnlargeButton.addMouseListener( new EnlargeButtonListener() );

	   // ** Event Delegation Method 2b. **    
		mResetButton.addMouseListener(mPanel); // the DrawingPanel acts as a listener

	   // ** Event Delegation Method 2c. **    
	   	mComboBox.addActionListener(new ActionListener() {  // instant listener object
	   		public void actionPerformed(ActionEvent e) {
	   			mPanel.SetColor( (Color) mComboBox.getSelectedItem() );
	   			repaint();
	   		} });

	   	// ** Event Delegation Method 3a. **    
		mQuitButton.addMouseListener( new QuitButtonListener() );
	   		
	   // ** Event Delegation Method 3b. **    
	   	mResetButton.addMouseListener( new MouseAdapter(){  // instant adapter object
	   		public void mouseEntered(MouseEvent e){
	   			System.out.println("Press to reset the panel...");
	   		}
	   	});
	}	
	
   public static void main(String s[]) {
    	EventHandlingFrameNoLayout frame = new EventHandlingFrameNoLayout("Eventhandling frame without layout");

		// puts window in the middle of the screen
		Dimension frameSize = frame.getSize();
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        frame.setLocation(screenSize.width / 2 - frameSize.width / 2, screenSize.height / 2 - frameSize.height / 2);

		frame.show();
    }
   
   // ** Event Delegation Method 2a. **
   // Listener for mEnlargeButton
   class EnlargeButtonListener implements MouseListener{
	   	public void mouseClicked(MouseEvent e) {
			mPanel.mSize += 10;
			System.out.println("Button "+e.getButton()+" clicked: new size = "+mPanel.mSize);
		}
	   	public void mouseEntered(MouseEvent e) {} // empty methods
	   	public void mouseExited(MouseEvent e) {}  // but MUST be implemented
	   	public void mousePressed(MouseEvent e) {}
	   	public void mouseReleased(MouseEvent e){}
   }
   // ** Event Delegation Method 3a. **
   // Listener for mQuitButton
   class QuitButtonListener extends MouseAdapter {
   	public void mouseClicked(MouseEvent e) { 
			   System.exit(0);
			}
	}	

/*
 * DrawingPanel.java
 *
 */
	class DrawingPanel extends JPanel implements MouseListener {
	
		int mX0, mY0, mSize;
		Color mColor = Color.red ; // default = red
		boolean mReset= true;
		
	    public DrawingPanel(){
	     	mX0 = 100; 
	     	mY0 = 100; 
	     	mSize = 40;
	     	setBackground(Color.white);
		   
	    	enableEvents(AWTEvent.MOUSE_EVENT_MASK); // noodzakelijk om processMouseEvent mogelijk te maken
	    }
	
	    // ** Event Delegation Method 1. **
	  	// I override the processMouseEvent of JPanel to handle the mouse events
	  	public void processMouseEvent(MouseEvent e) { 
		 	if (e.getID() == MouseEvent.MOUSE_CLICKED)
			 	{  // remember the coordinates
			 		mX0 = e.getX();
			 		mY0 = e.getY();
		    		repaint();
				}
		  }
	
	 	public void paintComponent(Graphics g) {
	 		super.paintComponent(g);
	 		if (mReset){
		 		g.clearRect(0, 0, 400, 400); // clear screen
	 			mReset = false;	
	 		} else {
	 			g.setColor(mColor);
	 			g.drawOval(mX0-mSize/2, mY0-mSize/2, mSize, mSize);
	 		}
		}
	    void SetColor(Color c){
	    	mColor = c;
	    	repaint();
	    }
	   // ** Event Delegation Method 2b. **    
	   // implementation of ALL MouseListener methods
		  public void mouseClicked(MouseEvent e) {
		  	mReset = true;
		  	repaint();
		  }
		  public void mouseEntered(MouseEvent e) {} // empty methods
		  public void mouseExited(MouseEvent e) {}
		  public void mousePressed(MouseEvent e) {}
		  public void mouseReleased(MouseEvent e){}
	        
	 }
}