- From: Dirk Schulze <dschulze@adobe.com>
- Date: Tue, 17 Sep 2013 01:45:37 -0700
- To: "Tab Atkins Jr." <jackalmage@gmail.com>
- CC: "Robert O'Callahan" <robert@ocallahan.org>, Jet Villegas W3C <w3c@junglecode.net>, Cameron McCormack <heycam@gmail.com>, Boris Zbarsky <bzbarsky@mozilla.com>, Doug Schepers <schepers@w3.org>, "public-pointer-events@w3.org" <public-pointer-events@w3.org>, "public-fx@w3.org" <public-fx@w3.org>, www-style <www-style@w3.org>
On Sep 16, 2013, at 6:42 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote: > On Mon, Sep 16, 2013 at 3:46 AM, Robert O'Callahan <robert@ocallahan.org> wrote: >> Making DOMPoint a dictionary, as currently proposed, is a problem since it >> means other objects (such as the proposed DOMQuad) can't have DOMPoints as >> attributes. I'm assuming the WebIDL restriction that attributes can't be >> dictionaries is not easily removed. > > Yes, this is fine with me. > >> I think we probably should make DOMPoint a regular interface. For methods >> that take DOMPoints as parameters, we can retain the convenient literal >> syntax for points by adding a DOMPointLiteral dictionary type and using >> union types, e.g. >> DOMPoint convertPoint((DOMPoint or DOMPointLiteral) point); > > You don't even need to do that - as long as their > attribute/dict-member names match, a DOMPoint *is* a DOMPointLiteral, > so you can just write the function signature as: > > DOMPoint convertPoint(DOMPointLiteral point) I still think it would be useful to resolve decisions on DOMPoint together with a view to the needs of DOMMatrix which uses a Point definition as well. The current definition of Point in DOMMatrix is a dictionary and should have been compatible with DOMPoint dictionary. It is my understanding that this does not need to be the case with an interface DOMPoint. Difference: DOMPoint just has the attributes 'x' and 'y'. Point in DOMMatrix has at least a third parameter 'z' and possibly a forth 'w' (needs a resolution). Greetings, Dirk > > ~TJ >
Received on Tuesday, 17 September 2013 08:46:20 UTC