P4
This issue is a response to the blog entry ( http://fxexperience.com/2011/05/javafx-2-0-beta-is-available/ ) by Richard, Jasper and Jonathan, where they asked to file Jira issues with use cases that the current API prohibits. One such case I just discovered while trying to port JavaFX-Script-like bindings to Clojure.
From the example JFX-Script code I saw about bindings it seems to me that it would be possible to do something like this:
def text = TextBox;
...
Label {text: bind text.rawText.toUpper() }
When one types in the TextBox "text" it immediately the Label with the identical text, but all upper case. After reading the docs for DoubleBinding I tried to do this in Clojure, unfortunately without success. When I did this in Java however it worked. I attached an example code file.
The challenge here is the following combination: a subclass needs to be made & an anon constructor is used & a protected method is called.
It is always a bit cumbersome when subclassing is required, but Clojure offers the proxy macro for that which generates such a subclassed instance. But inside this proxy I can not create an anon constructor, such as { super.bind(myProperty); }. Plus bind() is a protected method which also can not be called from a proxy class.
This could perhaps be solved by making bind public. I could then just subclass a StringBinding and implement its computeValue() method and directly after that call bind() outside. In the attached Java code the line containing { super.bind(tbp); } would be eliminated and directly after instantiating foo one would call foo.bind(tbp);
Another solution would be that StringBinding becomes an Interface, or a StringBindingITF gets added. The solution with an interface would be even more performant in Clojure.
I will be happily supporting this issue by testing in Clojure and reporting back, if this is required and if you decide to work on this issue.
From the example JFX-Script code I saw about bindings it seems to me that it would be possible to do something like this:
def text = TextBox;
...
Label {text: bind text.rawText.toUpper() }
When one types in the TextBox "text" it immediately the Label with the identical text, but all upper case. After reading the docs for DoubleBinding I tried to do this in Clojure, unfortunately without success. When I did this in Java however it worked. I attached an example code file.
The challenge here is the following combination: a subclass needs to be made & an anon constructor is used & a protected method is called.
It is always a bit cumbersome when subclassing is required, but Clojure offers the proxy macro for that which generates such a subclassed instance. But inside this proxy I can not create an anon constructor, such as { super.bind(myProperty); }. Plus bind() is a protected method which also can not be called from a proxy class.
This could perhaps be solved by making bind public. I could then just subclass a StringBinding and implement its computeValue() method and directly after that call bind() outside. In the attached Java code the line containing { super.bind(tbp); } would be eliminated and directly after instantiating foo one would call foo.bind(tbp);
Another solution would be that StringBinding becomes an Interface, or a StringBindingITF gets added. The solution with an interface would be even more performant in Clojure.
I will be happily supporting this issue by testing in Clojure and reporting back, if this is required and if you decide to work on this issue.