Groovy Bindable default value? - groovy

Question

I would like to have a text field whose value always reflects that of a certain field in a given object. I thought Bindable might be the way to do this. However, using the following example:
#!/usr/bin/env groovy
import groovy.swing.SwingBuilder
import groovy.beans.Bindable
import static javax.swing.JFrame.EXIT_ON_CLOSE
class TextModel {
#Bindable String text
}
def textModel = new TextModel()
def builder=new SwingBuilder()
builder.build {
frame( title: 'Binding Example (Groovy)', size: [240,100], show: true,
locationRelativeTo: null, defaultCloseOperation: EXIT_ON_CLOSE ) {
gridLayout cols: 1, rows: 2
textField id: 'textField'
bean textModel, text: bind{ textField.text }
label text: bind{ textModel.text }
}
}
textModel.text="AAAA"
modified from:
http://groovy.codehaus.org/Bindable+and+Vetoable+transformation
only the label text is set to that of textModel, but not that of the textField.
Any ideas???
Thank you
Misha
p.s. I seem to be able to get the opposite behavior, where the TextField reflects that state of the variable, but its value is not updated, if I do:
#!/usr/bin/env groovy
import groovy.swing.SwingBuilder
import groovy.beans.Bindable
import static javax.swing.JFrame.EXIT_ON_CLOSE
class TextModel {
#Bindable String text
}
def textModel = new TextModel()
def builder=new SwingBuilder()
builder.build {
frame( title: 'Binding Example (Groovy)', size: [240,100], show: true,
locationRelativeTo: null, defaultCloseOperation: EXIT_ON_CLOSE ) {
gridLayout cols: 1, rows: 2
textField id: 'textField',text:bind{ textModel.text }
label text: bind{ textModel.text }
}
}
textModel.text="AAAA"
p.p.s. If I add both:
#!/usr/bin/env groovy
import groovy.swing.SwingBuilder
import groovy.beans.Bindable
import static javax.swing.JFrame.EXIT_ON_CLOSE
class TextModel {
#Bindable String text
}
def textModel = new TextModel()
def builder=new SwingBuilder()
builder.build {
frame( title: 'Binding Example (Groovy)', size: [240,100], show: true,
locationRelativeTo: null, defaultCloseOperation: EXIT_ON_CLOSE ) {
gridLayout cols: 1, rows: 2
textField id: 'textField',text:bind{ textModel.text }
bean textModel, text: bind{ textField.text }
label text: bind{ textModel.text }
}
}
textModel.text="AAAA"
I get
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Attempt to mutate in notification
p.p.p.s. This is my best solution:
#!/usr/bin/env groovy
import groovy.swing.SwingBuilder
import groovy.beans.Bindable
import static javax.swing.JFrame.EXIT_ON_CLOSE
class TextModel {
#Bindable String text
}
def textModel = new TextModel()
textModel.text="AAAA"
def builder=new SwingBuilder()
builder.build {
frame( title: 'Binding Example (Groovy)', size: [240,100], show: true,
locationRelativeTo: null, defaultCloseOperation: EXIT_ON_CLOSE ) {
gridLayout cols: 1, rows: 2
textField id: 'textField',text:textModel.text
bean textModel, text: bind{ textField.text }
label text: bind{ textModel.text }
}
}

Answer 1

The Griffon guide on binding, describes the mutual property as being what you want. Even though you're not using Griffon in this case, bind seems to be a standard Groovy feature. If you create textField like this:
textField id: 'textField', text: bind('text', source: textModel, mutual: true)
textField will get its initial value from textModel.text, write updates to it when the user types in the field, and display the updated value when changes to textModel.text occur (from some background thread, say). When I tried to bind two text inputs like this, I started getting the IllegalStateExceptions you described, but it seems one input and multiple labels are fine.