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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] 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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21
ports/servoshell/desktop/app_state.rs
View file

@ -17,9 +17,9 @@ use servo::ipc_channel::ipc::IpcSender;
use servo::webrender_api::ScrollLocation;
use servo::webrender_api::units::{DeviceIntPoint, DeviceIntRect, DeviceIntSize};
use servo::{
AllowOrDenyRequest, AuthenticationRequest, FilterPattern, GamepadHapticEffectType, LoadStatus,
PermissionRequest, Servo, ServoDelegate, ServoError, SimpleDialog, TouchEventType, WebView,
WebViewDelegate,
AllowOrDenyRequest, AuthenticationRequest, FilterPattern, FormControl, GamepadHapticEffectType,
LoadStatus, PermissionRequest, Servo, ServoDelegate, ServoError, SimpleDialog, TouchEventType,
WebView, WebViewDelegate,
};
use url::Url;
@ -583,4 +583,19 @@ impl WebViewDelegate for RunningAppState {
fn hide_ime(&self, _webview: WebView) {
self.inner().window.hide_ime();
}
fn show_form_control(&self, webview: WebView, form_control: FormControl) {
if self.servoshell_preferences.headless {
return;
}
match form_control {
FormControl::SelectElement(prompt) => {
// FIXME: Reading the toolbar height is needed here to properly position the select dialog.
// But if the toolbar height changes while the dialog is open then the position won't be updated
let offset = self.inner().window.toolbar_height();
self.add_dialog(webview, Dialog::new_select_element_dialog(prompt, offset));
},
}
}
}