[racket] Problem with on-subwindow-event

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Tue Sep 25 07:53:23 EDT 2012

Well, I'm not sure what is going on, I'm sorry to say. I looked
through the code in mred/private/wx/win32/ and it seems like racket is
just handing along events that come its way (from windows). There may
be a bug in there that causes event duplication, but I'm not seeing


On Tue, Sep 25, 2012 at 12:47 AM, Kieron Hardy <kieron.hardy at gmail.com> wrote:
> I used 'enter to make the problem easy to demonstrate, but what I'm really interested in is button up/down events and they get duplicated also. Unfortunately there's no guarantee that a window will ever get a matched pair of up/down events (due to pop-ups etc.) so I really can't rely on that.
> But I might be able to work-around by storing the mouse-event% when first processing, and then treat as duplicate all calls to on-subwindow-event that pass that same event.
> Kieron
> On Sep 24, 2012, at 19:47, Robby Findler <robby at eecs.northwestern.edu> wrote:
>> Oh. Well, either this is going to be a bug, or it is going to fall
>> under "you sometimes get strange events, thanks to details of how the
>> platform interacts with its apps". I'm not sure which in this case,
>> but can you tell that you've gotten two enters without getting a leave
>> inbetween?
>> Robby
>> On Mon, Sep 24, 2012 at 7:38 PM, Kieron Hardy <kieron.hardy at gmail.com> wrote:
>>> On Sep 24, 2012, at 17:57, Robby Findler <robby at eecs.northwestern.edu> wrote:
>>>> When I run this on the mac, I don't see any enter events, which seems
>>>> strange.
>>> Strange - I am on Windows but thought the code would work on all platforms.
>>>> But my initial reaction to your question was that you need to
>>>> use the 'r' argument.
>>> But the receiver (r) for all three events for the frame% is the same. Ditto for both events for the list-box%.
>>> Kieron

Posted on the users mailing list.