COM interfaces ICoreWebView2EnvironmentOptions4 and above missing on CoreWebView2EnvironmentOptions.

[Themayu]

Hello. I'm trying to implement into wry (and by extension, tauri) the ability to change the WebView2 scrollbar style to the Fluent Overlay style on Windows. I've hit a bit of a snag:

It would appear, from testing, that this crate doesn't define implementations of COM interfaces ICoreWebView2EnvironmentOptions4 through ICoreWebView2EnvironmentOptions8 on CoreWebView2EnvironmentOptions, which means I cannot cast to the necessary interface (8) in order to write the new version. Attempting to do the following returns Err():

let options: ICoreWebView2EnvironmentOptions =
    CoreWebView2EnvironmentOptions::default().into();

let options8 = options.cast::<ICoreWebView2EnvironmentOptions8>();

match options8 {
  Ok(options8) => {
    let scrollbar_style = COREWEBVIEW2_SCROLLBAR_STYLE_FLUENT_OVERLAY;

    println!("setting scrollbar style:\n  {scrollbar_style:?}");
    let _ = options8.SetScrollBarStyle(scrollbar_style);
  }
  Err(err) => {
    println!("cannot set scrollbar style:\n  {err:?}");
  }
}

OUTPUT:

cannot set scrollbar style:
  Error { code: HRESULT(0x80004002), message: "No such interface supported" }

Would it be possible to get these added? I would do this myself in a pull request, but I do not understand Windows COM interfaces enough to be sure I could do it without getting something horribly wrong.

[wravery]

Thanks! I added implementations for those interfaces, and a unit test like in callback.rs to catch when new ICoreWebview2EnvironmentOptions... interfaces are added to the SDK. I'll publish the updates to crates.io momentarily.

N.B. ICoreWebview2EnvironmentOptions4 was already implemented, but there's a special case where I needed to replace it with IFixedEnvironmentOptions4.

[Themayu]

Thank you so much.