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Re: Mouse Lock

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 22 Jun 2011 08:17:04 -0700
Message-ID: <BANLkTin+taFqZ6CgnSK24jd4+=Jbqw7xrg@mail.gmail.com>
To: Ryosuke Niwa <rniwa@webkit.org>
Cc: Adam Barth <w3c@adambarth.com>, Vincent Scheib <scheib@google.com>, Brandon Andrews <warcraftthreeft@sbcglobal.net>, "Gregg Tavares (wrk)" <gman@google.com>, Glenn Maynard <glenn@zewt.org>, Charles Pritchard <chuck@jumis.com>, Kenneth Russell <kbr@google.com>, robert@ocallahan.org, public-webapps@w3.org
On Wed, Jun 22, 2011 at 8:02 AM, Ryosuke Niwa <rniwa@webkit.org> wrote:
> On Mon, Jun 20, 2011 at 10:48 AM, Tab Atkins Jr. <jackalmage@gmail.com>
> wrote:
>>
>> 2. During a user-initiated click, you can lock the mouse to the target
>> or an ancestor without a permissions prompt, but with a persistent
>> message, either as an overlay or in the browser's chrome.
>
> Does this mean that website is forced to release the lock before mouse-up
> happens?  Or did you just mean that a website can start the lock during a
> click?

The latter; the former is useful, but in a different way (it's for
letting people drag something, like a scrollbar, without having to
stay precisely on the element).


> If it's latter, I have a problem with that.  I know many people who
> select text on a page just to read them.  They obviously don't expect their
> cursors being tracked/locked by a website.

We can't do anything about cursors being "tracked" - that's allowed
already by the existing mouse events.

I don't expect authors to lock the mouse arbitrarily with this ability
unless they're being malicious.  The intent is to allow non-fullscreen
games to lock the mouse when the user clicks the "Start Game" button
or similar.  (For the malicious authors, see below.)

> Also, once my mouse is locked, how do I free it?

That was covered in the paragraph you quoted, though cursorily.  If
the mouse is locked in this way, the browser should show a persistent
message (either in its chrome or as an overlay) saying something like
"Your mouse cursor is being hidden by the webpage.  Press Esc to show
the cursor.".

This shouldn't be too annoying for the games case, but should allow
users, even clueless ones, to know when a site is being malicious and
how to fix it.  Once they get their cursor back, they can just leave
that page.

~TJ
Received on Wednesday, 22 June 2011 15:18:39 GMT

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