Re: Use user_data in callback

[Jay Strict <jay strict posteo de>]

On 23.09.2015 12:45, Norman L Smith wrote:
> Hello Jay,
>
> From /usr/share/gnome-js/signals.js

Where do I find this file "signals.js"? It is not in my file system tree.

> function _connect(name, callback) {
>
> The connect takes two arguments.
>
> The callback argument, without binding additional arguments to 
> the callback, consists of only the function and its first and 
> second argument. 
>
> lang.bind as noted in the comments below provides for the use
> of "this" in the body of the callback function and binding
> additional arguments to the callback function.
>
> From /usr/share/gnome-js/lang.js

Again, no file "lang.js", neither in /usr/share/gnome-shell/** nor in
/usr/** nor in https://github.com/GNOME/gnome-shell.git

> /**
>  * Binds obj to callback. Makes it possible to refer to "obj"
>  * using this within the callback.
>  * @param {object} obj the object to bind
>  * @param {function} callback callback to bind obj in
>  * @param arguments additional arguments to the callback
>  * @returns: a new callback
>  * @type: function
>  */
>
> You will not see many examples of using the binding of additional 
> arguments because of "this" being available in the callback function.

Ah ok, I see that you don't need additional arguments when you have
"this" available.


Kind regards,
Jay