(nested?) anonymous inner classes for buttons

Question

I've used an anon inner class to get a button obj:

Button modButton = new Button("Modify");
modButton.addClickHandler(new ClickHandler() {
    @Override
    public void onClick(ClickEvent event) {
        //TODO: link to a pop-up, and do a refresh on exit
    }
});

I want to use this in an arbitrarily sized GWT FlexTable (which is basically an auto re-sizing table).

if i do something like this:

currentTable.setText(3, 0, "elec3");
currentTable.setWidget(3, 2, modButton);

currentTable.setText(4, 0, "elec4");
currentTable.setWidget(4, 2, modButton);

The button only shows up for the latter one (since there is only one instance). Since the table above will be populated programatically, its not really practical to define a new button for each possible instance.

I tried this the following:

currentTable.setText(4, 0, "elec4");
currentTable.setWidget(4, 2, new Button("Modify");
modButton.addClickHandler(new ClickHandler() {
    @Override
    public void onClick(ClickEvent event) {
        //TODO: link to a pop-up, and do a refresh on exit
    }
});
);

However, this won't compile at all (the first; I guess), I'm a bit lost - how can I accomplish this effect?

Thanks

Answer 1

Your syntax is incorrect in the third example, but in any case, using an anonymous class in that case is impossible. You are trying to call addClickHandler on the newly-instantiated object, which is not stored in any variable. Theoretically, you could put that code in a constructor for your anonymous class and call that function on "this". The problem is, because of the peculiarities of Java's (absolutely atrocious) anonymous class syntax, it is impossible to define a constructor (what would it be called?).

I'm not 100% sure I understand what you are trying to accomplish, but could you define a function that just returned a new, correctly-configured button instance each time you called it? For example,

private Button newModButton() {
    Button modButton = new Button("Modify");
    modButton.addClickHandler(new ClickHandler() {
        @Override
        public void onClick(ClickEvent event) {
            //TODO: link to a pop-up, and do a refresh on exit
        }
    });
    return modButton;
}

Then you would call

currentTable.setWidget(4, 2, newModButton());