Add transformer String to VNode

[yozhgoor]

Description

I contribute to yewprint. I use VNode as a type of some props and I want to allow the user to pass a component instead of just a String.

Example: cecton/yewprint@d2f5ee8

error[E0277]: the trait bound `yew::virtual_dom::VComp: yew::virtual_dom::Transformer<&str, yew::virtual_dom::VNode>` is not satisfied
  --> yewprint-doc/src/progressbar/mod.rs:84:35
   |
84 | ...                   label="Animate"
   |                             ^^^^^^^^^ the trait `yew::virtual_dom::Transformer<&str, yew::virtual_dom::VNode>` is not implemented for `yew::virtual_dom::VComp`
   |

In this example, I have try to use a VNode as a label and now I need to replace all the labels in my code with label=html!("Animate") and that in 31 places.

Checklist

• I have run cargo make pr-flow
• I have reviewed my own code
• I have added tests

[siku2]

This, to me, feels too implicit given that a more explicit version already exists:

html! {
  <Model label=html!("Cooperative") />
}

If you think that's too verbose for your use case you can create a dedicated type and implement the transformation for that.

struct MyWrapper(Html);
impl Transformer<Html, MyWrapper> for VComp {}
impl Transformer<&'_ str, MyWrapper> for VComp {}

struct Props {
  label: MyWrapper,
}

html! {
  <Model label=html! { <strong>{ "works!" }</strong> } />
  <Model label="also works" />
}

[cecton]

I'm mentoring @yozhgoor , the PR was my idea 🙂

I forgot you can do html!("string"). In a node you can't do that so it feels counter intuitive. (html!(<div>"string"</div>) is invalid)

I guess this is fine by me. Thanks! We can close this PR if @yozhgoor think it's ok.

[cecton]

(The wrapper thingy is a no go solution imo. It would introduce some specific magic to a library of yew, it will feel counter intuitive to the user)