Re: [racket-users] Racket GUI system and multi-touch events

[Johan Liseborn]

I'm moving this from Racket Users to Racket Developers instead, I hope that is correct.

On Sat, Sep 24, 2016 at 10:05 PM, Matthew Flatt <mfl...@cs.utah.edu> wrote:

The Racket binding for Gtk (or Cocoa or Windows) in `racket/gui`
currently does not report multi-touch events. I agree that multi-touch
events could be supported without too much difficulty, probably, and a
pull request would be welcome --- but there's nothing in place right
now.

I started looking through the code, but as my knowledge of the Racket internals is very limited, I just want to check that I am approximately in the right place.

First, is https://github.com/racket/gui.git the correct repo to dig in?

Second, are .../gui-lib/mred/private/[common|gtk|win32|cocoa]/ the right directories to look in?

A very quick look seems to indicate that .../common/event.rkt defines the windowing events (e.g. mouse-event%, key-event%, etc), and that actual instances of the events are created in .../gtk/window.rkt, .../win32/window.rkt, and .../cocoa/window.rkt. I also see ffi-stuff in the respective window.rkt files, am I right to assume this is where the gui events from the respective underlying windowing system gets translated into Racket events, and that it would be here similar code for touch events should be added?

Again, I have only briefly looked at this, so I just wish to make sure I am looking in the right place. I will then continue to read docs and code, and try not to ask too many stupid questions... :-)

Cheers,

/johan

--

Johan Liseborn

[Matthew Flatt]

Yes, that's all correct!

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