Griffon @ Svwjug

Welcome to the Desktop Revolution

+ +

+ Sugar, Spice and everything Nice =

HelloWorld.java

public class HelloWorld {
String name;

public void setName(String name)
{ this.name = name; }
public String getName(){ return name; }

public String greet()
{ return "Hello "+ name; }

public static void main(String args[]){
HelloWorld helloWorld = new HelloWorld();
helloWorld.setName("Groovy");
System.err.println( helloWorld.greet() );
}
}

HelloWorld.groovy

public class HelloWorld {
String name;

public void setName(String name)
{ this.name = name; }
public String getName(){ return name; }

public String greet()
{ return "Hello "+ name; }

public static void main(String args[]){
HelloWorld helloWorld = new HelloWorld();
helloWorld.setName("Groovy");
System.err.println( helloWorld.greet() );
}
}

GroovierHelloWorld.groovy

class HelloWorld {
String name
def greet() { "Hello $name" }
}

def helloWorld = new HelloWorld(name:"Groovy")
println helloWorld.greet()

import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.SwingUtilities;

public class JavaFrame {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
JFrame frame = buildUI();
frame.setVisible(true);
}
});
}
// next page ...

// continued ...
private static JFrame buildUI() {
JFrame frame = new JFrame("JavaFrame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(
new GridLayout(3,1) );
final JTextField input = new JTextField(20);
final JTextField output = new JTextField(20);
output.setEditable(false);
JButton button = new JButton("Click me!");
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event) {
output.setText(input.getText());
}
});
frame.getContentPane().add(input);
frame.getContentPane().add(button);
frame.getContentPane().add(output);
frame.pack();
return frame;
}
}

● The light at the end of the tunnel...

import groovy.swing.SwingBuilder
import static javax.swing.JFrame.EXIT_ON_CLOSE

new SwingBuilder().edt {
frame(title: "GroovyFrame", pack: true, visible: true,
defaultCloseOperation: EXIT_ON_CLOSE) {
gridLayout(cols: 1, rows: 3)
textField(id: "input", columns: 20)
button("Click me!", actionPerformed: {
output.text = input.text
})
textField(id: "output", columns: 20, editable: false)
}
}

What is going on?

Each node is syntactically a method call
All of these method calls are dynamically dispatched
Most don’t actually exist in bytecode
Child closures create hierarchical relations
Child widgets are added to parent containers
SwingBuilder node names are derived from Swing classes
Remove the leading ‘J’ from a Swing class when present
SwingBuilder also supports some AWT classes like layouts

Threading and the EDT

All painting and UI operations must be done in the EDT
Anything else should be outside the EDT
Swing has SwingUtilities using Runnable
Java 6 technology adds SwingWorker
However, closures are Groovy
For code inside EDT
edt { … }
doLater { … }
For code outside EDT
doOutside { … }
Build UI on the EDT
SwingBuilder.build { … }

Threading Example

action( id: 'countdown', name: 'Start Countdown',
closure: { evt ->
int count = lengthSlider.value
status.text = count

while ( --count >= 0 ) {
sleep( 1000 )
status.text = count
}

status.background = Color.RED

})

Threading Example

action( id: 'countdown', name: 'Start Countdown',
closure: { evt ->
int count = lengthSlider.value
status.text = count
doOutside {
while ( --count >= 0 ) {
sleep( 1000 )
edt { status.text = count }
}
doLater {
status.background = Color.RED
}
}
})

Binding Example


frame( title: "Binding Test", size: [200, 120],
visible: true ) {
gridLayout( cols: 1, rows: 2 )
textField( id: "t1" )
textField( id: "t2", editable: false )
}

bind(source: t1, sourceProperty: "text",
target: t2, targetProperty: "text")
}

Binding Example


visible: true ) {
textField( id: "t2", editable: false,
text: bind(source: t1,
sourceProperty: "text") )
}
}

Binding Example


visible: true ) {
textField( id: "t2", editable: false,
text: bind{ t1.text } )
}
}

Convention over Configuration
Don't repeat yourself (DRY)
MVC Pattern
Testing supported “out of the box”
Automate repetitive tasks

Convention over Configuration

Java Desktop Application Conventions are MIA
Very few official examples
No Blueprints (Like Java EE Blueprints)
We have to create our own
Following Grails Patterns
Source Files Segregated by Role
Standardize App Lifecycle (like JSR-296)
Automated Packaging (App, WebStart, Applet)

Lyfecycle Scripts

Lifecycle Scripts are in griffon-app/lifecycle
Lifecycle Events modeled after JSR-296

Initialize
Startup
Ready
Shutdown

Don't Repeat Yourself

How? Use a Dynamic Language!
With Closures/Blocks
With terse property syntax
myJTextArea.text = "Fires Property Change"
With terse eventing syntax
button.actionPerformed = {println 'hi'}
With Rich Annotation Support
@Bindable String aBoundProperty

Most of this impacts the View Layer
See JavaOne 2008 TS-5098 - Building Rich
Applications with Groovy's SwingBuilder

Built-in Testing

Griffon has built in support for testing
create-mvc script creates a test file in
test/integration
Uses GroovyTestCase
See JavaOne 2008 TS-5101 – Boosting your Testing
Productivity with Groovy
Griffon doesn’t write the test for you
test-app script executes the tests for you
Bootstraps the application for you
Everything up to instantiating MVC Groups

Testing Plugins

Sometimes apps need more involved testing
fest
Fluent interface for functional swing testing
easyb
Behavioral Driven Development
code-coverage – Cobertura
Line Coverage Metrics
jdepend
Code quality metrics
codenarc
Static code analysis

Automate Tasks

command line interface
Scripts and events
plugins
builders: SwingX, JIDE, Flamingo, Trident , CSS,
JavaFX and more
miscellaneous: installer (IzPack, RPM, OSX app
bundles), Splash, Wizard, Scala

Resources

http://griffon.codehaus.org
http://griffon.codehaus.org/Builders
http://griffon.codehaus.org/Plugins
http://groovy.dzone.com
twitter: @theaviary

Griffon in Action (2010)

● http://manning.com/almiray

● http://groovymag.com

Groovy, Grails, Griffon and more!

Image Credits

http://www.flickr.com/photos/fadderuri/841064754/
http://www.flickr.com/photos/colorloose/3539708679/
http://www.flickr.com/photos/icultist/2842153495/
http://www.flickr.com/photos/bishi/2313888267/
http://www.flickr.com/photos/kirimobile/2581287574/
http://www.flickr.com/photos/chelseaaaaaa/3564365301/
http://www.flickr.com/photos/psd/2086641/

Griffon @ Svwjug

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Griffon @ Svwjug