Could you clarify what you are trying to achieve? If we don't support,
everything would be weird.
I guess you are proposing the alternative of the current pool population
algorithm and pool distribution algorithm.
I appreciate you could explain what are expected result using algorithms.
On Tue, Apr 28, 2015 at 6:58 AM Ryosuke Niwa <rn...@apple.com> wrote:
> On Apr 27, 2015, at 2:38 PM, Hayato Ito <hay...@chromium.org> wrote:
>
> On Tue, Apr 28, 2015 at 6:18 AM Ryosuke Niwa <rn...@apple.com> wrote:
>
>>
>> > On Apr 26, 2015, at 6:11 PM, Hayato Ito <hay...@chromium.org> wrote:
>> >
>> > I think Polymer folks will answer the use case of re-distribution.
>> >
>> > So let me just show a good analogy so that every one can understand
>> intuitively what re-distribution *means*.
>> > Let me use a pseudo language and define XComponent's constructor as
>> follows:
>> >
>> > XComponents::XComponents(Title text, Icon icon) {
>> > this.text = text;
>> > this.button = new XButton(icon);
>> > ...
>> > }
>> >
>> > Here, |icon| is *re-distributed*.
>> >
>> > In HTML world, this corresponds the followings:
>> >
>> > The usage of <x-component> element:
>> > <x-components>
>> > <x-text>Hello World</x-text>
>> > <x-icon>My Icon</x-icon>
>> > </x-component>
>> >
>> > XComponent's shadow tree is:
>> >
>> > <shadow-root>
>> > <h1><content select="x-text"></content></h1><!-- (1) -->
>> > <x-button><content select="x-icon"></content></x-button><!-- (2) -->
>> > </shadow-root>
>>
>> I have a question as to whether x-button then has to select which nodes
>> to use or not. In this particular example at least, x-button will put
>> every node distributed into (2) into a single insertion point in its shadow
>> DOM.
>>
>> If we don't have to support filtering of nodes at re-distribution time,
>> then the whole discussion of re-distribution is almost a moot because we
>> can just treat a content element like any other element that gets
>> distributed along with its distributed nodes.
>>
>>
> x-button can select.
> You might want to take a look at the distribution algorithm [1], where
> the behavior is well defined.
>
>
> I know we can in the current spec but should we support it? What are
> concrete use cases in which x-button or other components need to select
> nodes in nested shadow DOM case?
>
> - R. Niwa
>
>
