add 2-5-EventBinding

java/2-5-EventBinding/AdapterEvents.java

+/*
+* CS 349 Java Code Examples
+*
+* AdapterEvents.java        Binding events by creating a child listener 
+*                           adapter object.
+*
+*/
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionAdapter;
+
+import java.awt.*;
+
+public class AdapterEvents extends JPanel  {
+	
+    public static void main(String[] args) {
+    	AdapterEvents panel = new AdapterEvents();
+        JFrame f = new JFrame("AdapterEvents"); 
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(200, 200); 
+        f.setContentPane(panel);
+        f.setVisible(true); 
+    }
+
+    AdapterEvents() {
+        this.addMouseMotionListener(new MyMouseMotionListener());
+    }
+    
+    class MyMouseMotionListener extends MouseMotionAdapter {
+
+    	public void mouseDragged(MouseEvent e) {
+    		x = e.getX();
+    		y = e.getY();
+    		repaint();	
+    	}
+    }
+    
+    int x;
+    int y;
+    int size = 50;
+
+    public void paintComponent(Graphics g) {
+    	super.paintComponent(g);
+        Graphics2D g2 = (Graphics2D) g; 
+        g2.setColor(Color.RED);
+		g2.fillOval(x - size/2, y - size/2, size, size);
+    }
+
+
+
+
+}
\ No newline at end of file

java/2-5-EventBinding/EventLoop.java

+/*
+* CS 349 Java Code Examples
+*
+* EventLoop.Java            Binding events by tapping into the low-level
+*                             java event queue.
+*
+*/
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+
+import java.awt.event.MouseEvent;
+import java.awt.*;
+import java.lang.reflect.InvocationTargetException;
+
+public class EventLoop extends JPanel  {
+	
+	EventLoop() 
+			throws InterruptedException, InvocationTargetException  {
+
+        EventQueue.invokeAndWait(new Runnable() {
+            public void run() {
+                EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
+                // replace the current event queue with MyEventQueue
+                eq.push(new MyEventQueue());
+                System.out.println("Run");
+            }
+        });	
+    }
+
+    public static void main(String[] args)
+    		throws InterruptedException, InvocationTargetException {
+
+    	EventLoop panel = new EventLoop();
+        JFrame f = new JFrame("EventLoop"); 
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(200, 200); 
+        f.setContentPane(panel);
+        f.setVisible(true); 
+    }
+    
+    int x;
+    int y;
+    int size = 50;
+
+    public void paintComponent(Graphics g) {
+    	super.paintComponent(g);
+        Graphics2D g2 = (Graphics2D) g; 
+        g2.setColor(Color.RED);
+		g2.fillOval(x - size/2, y - size/2, size, size);
+    }
+    
+
+    // kind of like an event loop
+    private class MyEventQueue extends EventQueue {
+    	// mouse events come in here
+        public void dispatchEvent(AWTEvent e) {
+            //System.out.println("dispatchEvent " + e.getID() );
+            if (e.getID() == MouseEvent.MOUSE_DRAGGED) {
+                MouseEvent me = (MouseEvent)e;
+    			x = me.getX();
+    			y = me.getY();
+                System.out.println("(" + x + "," + y + ")");
+                repaint();
+    		}
+            super.dispatchEvent(e);
+        }
+    }
+}
\ No newline at end of file

java/2-5-EventBinding/InheritanceEvents.java

+/*
+* CS 349 Java Code Examples
+*
+* InheritanceEvents.java    Binding events by extending base class with
+*                           event callback methods.
+*/
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import java.awt.event.MouseEvent;
+import java.awt.*;
+
+public class InheritanceEvents extends JPanel  {
+
+    public static void main(String[] args) {
+    	InheritanceEvents panel = new InheritanceEvents();
+        JFrame f = new JFrame("InheritanceEvents"); 
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(200, 200); 
+        f.setContentPane(panel);
+        f.setVisible(true); 
+        
+        // enable events for this JPanel
+    	panel.enableEvents(MouseEvent.MOUSE_MOTION_EVENT_MASK);
+    }
+    
+	protected void processMouseMotionEvent(MouseEvent e)
+	{
+		// only detects when button is down WHILE also moving
+		if (e.getID() == MouseEvent.MOUSE_DRAGGED) {
+			x = e.getX();
+			y = e.getY();
+            repaint();
+		}
+	}
+
+    int x;
+    int y;
+    int size = 50;
+
+    public void paintComponent(Graphics g) {
+    	super.paintComponent(g);
+        Graphics2D g2 = (Graphics2D) g; 
+        g2.setColor(Color.RED);
+		g2.fillOval(x - size/2, y - size/2, size, size);
+    }
+
+
+}
\ No newline at end of file

java/2-5-EventBinding/InterfaceEvents.java

+/*
+* CS 349 Java Code Examples
+*
+* InterfaceEvents.java      Binding events by implementing event listener
+*                           interface.
+*/
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionListener;
+import java.awt.*;
+
+public class InterfaceEvents extends JPanel implements MouseMotionListener  {
+	
+	InterfaceEvents() {
+		// need to add the listener to this panel 
+		// (panel and listener are the same in this case)
+        this.addMouseMotionListener(this);
+	}
+
+    public static void main(String[] args) {
+    	InterfaceEvents panel = new InterfaceEvents();
+        JFrame f = new JFrame("InterfaceEvents"); 
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(200, 200); 
+        f.setContentPane(panel);
+        f.setVisible(true); 
+    }
+    
+	public void mouseDragged(MouseEvent e) {
+		x = e.getX();
+		y = e.getY();
+		repaint();	
+	}
+
+	public void mouseMoved(MouseEvent e) { /* no-op */  }
+    
+    int x;
+    int y;
+    int size = 50;
+
+    public void paintComponent(Graphics g) {
+    	super.paintComponent(g);
+        Graphics2D g2 = (Graphics2D) g; 
+        g2.setColor(Color.RED);
+		g2.fillOval(x - size/2, y - size/2, size, size);
+    }
+}
\ No newline at end of file

java/2-5-EventBinding/ListenerEvents.java

+/*
+* CS 349 Java Code Examples
+*
+* ListenerEvents.java       Binding events by creating a child object 
+*                           which implements the listener interface.
+*
+*/
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionListener;
+import java.awt.event.MouseMotionAdapter;
+
+import java.awt.*;
+
+public class ListenerEvents extends JPanel  {
+	
+    public static void main(String[] args) {
+    	ListenerEvents panel = new ListenerEvents();
+        JFrame f = new JFrame("ListenerEvents"); 
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(200, 200); 
+        f.setContentPane(panel);
+        f.setVisible(true); 
+    }
+
+    ListenerEvents() {
+        // need to add the listener to this panel 
+        this.addMouseMotionListener(new MyMouseMotionListener());
+    }
+    
+    // inner class listener
+    class MyMouseMotionListener implements MouseMotionListener {
+
+    	public void mouseDragged(MouseEvent e) {
+    		x = e.getX();
+    		y = e.getY();
+    		repaint();	
+    	}
+
+    	public void mouseMoved(MouseEvent e) { /* no-op */ }
+    }
+    
+    int x;
+    int y;
+    int size = 50;
+
+    public void paintComponent(Graphics g) {
+    	super.paintComponent(g);
+        Graphics2D g2 = (Graphics2D) g; 
+        g2.setColor(Color.RED);
+		g2.fillOval(x - size/2, y - size/2, size, size);
+    }
+
+
+
+
+}
\ No newline at end of file

java/2-5-EventBinding/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = "EventLoop"
+
+all:
+	@echo "Compiling..."
+	javac *.java
+
+run: all
+	@echo "Running..."
+	java $(NAME)
+
+clean:
+	rm -rf *.class

java/2-5-EventBinding/readme.md

+## Java event demos
+
+* `EventLoop.java` Binding events by tapping into the low-level java event queue	
+
+* `InheritanceEvents.java` Binding events by extending base class with  event callback methods
+
+* `InterfaceEvents.java` Binding events by implementing event listener interface
+
+* `ListenerEvents.java` Binding events by creating a child object which implements the listener interface
+
+* `AdapterEvents.java` Binding events by creating a child listener adapter object
+
+			    	  
\ No newline at end of file