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windows-reactor: SplitView.display_mode() compiles but never reaches WinUI #4837
Description
Summary
SplitView exposes a .display_mode(SplitViewDisplayMode::…) builder and the WinUI backend already implements Prop::DisplayMode -> ISplitView::SetDisplayMode, but the generated bindings never emit that prop. Calling .display_mode() updates only the Rust struct,WinUI always keeps the default Inline mode.The official sample uses .display_mode(SplitViewDisplayMode::Inline), which matches the WinUI default, so the sample appears to work while the API is effectively broken for every other mode (Overlay, CompactOverlay, CompactInline).
Crate manifest
[package]
name = "split_view_display_mode_repro"
version = "0.1.0"
edition = "2024"
publish = false
[dependencies]
windows-reactor = { git = "https://github.com/microsoft/windows-rs" }
[build-dependencies]
windows-reactor-setup = { git = "https://github.com/microsoft/windows-rs" }Crate code
build.rs
fn main() {
windows_reactor_setup::as_example();
}src/main.rs
use windows_reactor::*;
fn app(_cx: &mut RenderCx) -> Element {
split_view(
border(
text_block(
"Main content area.\n\
In Overlay mode this should stay full width\n\
and the pane should float on top.\n\
Instead it behaves like Inline (content is pushed aside).",
)
.padding(16.0),
)
.background(Color::rgb(40, 40, 40)),
)
.pane(
border(
vstack((
text_block("Pane content").bold(),
text_block("display_mode(Overlay) is ignored"),
text_block("WinUI stays in default Inline mode"),
))
.spacing(8.0)
.padding(16.0),
)
.background(Color::rgb(0, 90, 158)),
)
.display_mode(SplitViewDisplayMode::Overlay)
.is_pane_open(true)
.open_pane_length(260.0)
.into()
}
fn main() -> windows_core::Result<()> {
bootstrap()?;
App::new()
.title("SplitView display_mode repro")
.size(900.0, 500.0)
.render(app)
}
Activity
kennykerr commentedon Aug 18, 2026
Thanks for the report - working on an update that will prevent such quiet failures from compiling - hopefully have an update out soon.
kennykerr commentedon Aug 27, 2026
As of #4848,
SplitView::display_modeis included in the generated property path and reaches WinUI correctly.