From 1f3188e52cba7b0599287de2da03facf46f023f1 Mon Sep 17 00:00:00 2001
From: Keiko Katsuragawa <kkatsuragawa@uwaterloo.ca>
Date: Wed, 24 Jan 2018 01:30:22 -0500
Subject: [PATCH] add 2-5-EventBinding
---
java/2-5-EventBinding/AdapterEvents.java | 53 +++++++++++++++
java/2-5-EventBinding/EventLoop.java | 69 ++++++++++++++++++++
java/2-5-EventBinding/InheritanceEvents.java | 48 ++++++++++++++
java/2-5-EventBinding/InterfaceEvents.java | 48 ++++++++++++++
java/2-5-EventBinding/ListenerEvents.java | 58 ++++++++++++++++
java/2-5-EventBinding/makefile | 15 +++++
java/2-5-EventBinding/readme.md | 13 ++++
7 files changed, 304 insertions(+)
create mode 100644 java/2-5-EventBinding/AdapterEvents.java
create mode 100644 java/2-5-EventBinding/EventLoop.java
create mode 100644 java/2-5-EventBinding/InheritanceEvents.java
create mode 100644 java/2-5-EventBinding/InterfaceEvents.java
create mode 100644 java/2-5-EventBinding/ListenerEvents.java
create mode 100644 java/2-5-EventBinding/makefile
create mode 100644 java/2-5-EventBinding/readme.md
diff --git a/java/2-5-EventBinding/AdapterEvents.java b/java/2-5-EventBinding/AdapterEvents.java
new file mode 100644
index 0000000..15445f6
--- /dev/null
+++ b/java/2-5-EventBinding/AdapterEvents.java
@@ -0,0 +1,53 @@
+/*
+* 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
diff --git a/java/2-5-EventBinding/EventLoop.java b/java/2-5-EventBinding/EventLoop.java
new file mode 100644
index 0000000..504c245
--- /dev/null
+++ b/java/2-5-EventBinding/EventLoop.java
@@ -0,0 +1,69 @@
+/*
+* 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
diff --git a/java/2-5-EventBinding/InheritanceEvents.java b/java/2-5-EventBinding/InheritanceEvents.java
new file mode 100644
index 0000000..af59cb8
--- /dev/null
+++ b/java/2-5-EventBinding/InheritanceEvents.java
@@ -0,0 +1,48 @@
+/*
+* 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
diff --git a/java/2-5-EventBinding/InterfaceEvents.java b/java/2-5-EventBinding/InterfaceEvents.java
new file mode 100644
index 0000000..8aa7aa5
--- /dev/null
+++ b/java/2-5-EventBinding/InterfaceEvents.java
@@ -0,0 +1,48 @@
+/*
+* 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
diff --git a/java/2-5-EventBinding/ListenerEvents.java b/java/2-5-EventBinding/ListenerEvents.java
new file mode 100644
index 0000000..decbf85
--- /dev/null
+++ b/java/2-5-EventBinding/ListenerEvents.java
@@ -0,0 +1,58 @@
+/*
+* 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
diff --git a/java/2-5-EventBinding/makefile b/java/2-5-EventBinding/makefile
new file mode 100644
index 0000000..c4642a1
--- /dev/null
+++ b/java/2-5-EventBinding/makefile
@@ -0,0 +1,15 @@
+# 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
diff --git a/java/2-5-EventBinding/readme.md b/java/2-5-EventBinding/readme.md
new file mode 100644
index 0000000..198eb39
--- /dev/null
+++ b/java/2-5-EventBinding/readme.md
@@ -0,0 +1,13 @@
+## 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
--
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