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Support single-value <select> elements (#35684)

Browse source 
https://github.com/user-attachments/assets/9aba75ff-4190-4a85-89ed-d3f3aa53d3b0



Among other things this adds a new `EmbedderMsg::ShowSelectElementMenu`
to tell the embedder to display a select popup at the given location.

This is a draft because some small style adjustments need to be made:
* the select element should always have the width of the largest option
* the border should be part of the shadow tree

Apart from that, it's mostly ready for review.

<details><summary>HTML for demo video</summary>

```html
<html>

<body>
<select id="c" name="choice">
  <option value="first">First Value</option>
  <option value="second">Second Value</option>
  <option value="third">Third Value</option>
</select>
</body>
</html>
```
</details>

---

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] Part of https://github.com/servo/servo/issues/3551
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-04-03 14:11:55 +02:00 • committed by GitHub
parent 6e9d01b908
commit 0e99539dab
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32 changed files with 633 additions and 151 deletions
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7
components/script/dom/element.rs
View file

@ -514,7 +514,6 @@ impl Element {
#[allow(clippy::too_many_arguments)]
pub(crate) fn attach_shadow(
&self,
// TODO: remove is_ua_widget argument
is_ua_widget: IsUserAgentWidget,
mode: ShadowRootMode,
clonable: bool,
@ -4379,6 +4378,12 @@ impl Element {
let element = self.downcast::<HTMLLabelElement>().unwrap();
Some(element as &dyn Activatable)
},
NodeTypeId::Element(ElementTypeId::HTMLElement(
HTMLElementTypeId::HTMLSelectElement,
)) => {
let element = self.downcast::<HTMLSelectElement>().unwrap();
Some(element as &dyn Activatable)
},
NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLElement)) => {
let element = self.downcast::<HTMLElement>().unwrap();
Some(element as &dyn Activatable)