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Re: [cssom] Element size/positioning information

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 13 Apr 2011 10:27:22 -0700
Message-ID: <BANLkTikKcntL889iGKGLS4AahF7DXMoJYw@mail.gmail.com>
To: www-style@gtalbot.org
Cc: www-style list <www-style@w3.org>
2011/4/12 "Gérard Talbot" <www-style@gtalbot.org>:
> Le Mar 12 avril 2011 17:31, Tab Atkins Jr. a écrit :
>> Now, the mouse part of the discussion.
>>
>> Currently, there is one interoperable bit of location information
>> returned by mouse events - the position relative to the viewport.
>> Unfortunately, it's exposed via the unintuitive name of 'clientX' and
>> 'clientY'.
>>
>> Some browsers expose other information - IE and Webkit expose
>> offsetX/Y which is relative to the element itself
>
> I have said that Opera 9+ also supports offsetX/Y in one of my previous
> email.

I didn't say otherwise.


>  and still get
>> coordinates relative to a chosen element (for example, if you're
>> drawing into a canvas, and want to still track the mouse when it's
>> outside the canvas), then you have to switch back to using clientX/Y
>> and subtracting the element's own position.
>
> No.

Yes.  There is no way to listen for a mouse event on an element's
ancestor, and then get mouse coordinate relative to that element,
without using clientX/Y and subtracting the element's position.


>> All told, there appear to be three pieces of information that we want to
>> expose:
>>
>> 1. Mouse coordinates relative to the viewport.
>
> clientX/Y (also x/y according to CSSOM)

Nowhere did I claim that these don't work.  In fact, I specifically
said, elsewhere in the email, that clientX/Y already serve this
purpose, they just have a horrible name.


>> 2. Mouse coordinates relative to an element's layout box(es)
>
> By layout boxes, you mean offsetWidth/offsetHeight or you mean
> clientWidth/clientHeight? You want to include or exclude borders?

All of the above, plus more.  My email makes this clear.

~TJ
Received on Wednesday, 13 April 2011 17:29:47 GMT

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