app

commit 0fd5440ae09738080c9b4851a7a1946dcc71e83a
parent a6f3c8dee48ab9adf52c067975593228ea80a21b
Author: triesap <triesap@radroots.dev>
Date:   Wed, 21 Jan 2026 19:57:34 +0000

ui: add motion and contrast preference helpers

- add preference helpers with explicit error types

- use matchMedia for wasm preference queries

- add unit tests for preference helpers

- enable web-sys media query support

Diffstat:
M
crates/ui-core/Cargo.toml
 | 
1
+
M
crates/ui-core/src/lib.rs
 | 
7
+++++++
A
crates/ui-core/src/preference.rs
 | 
58
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 66 insertions(+), 0 deletions(-)
diff --git a/crates/ui-core/Cargo.toml b/crates/ui-core/Cargo.toml
@@ -19,6 +19,7 @@ web-sys = { workspace = true, features = [
   "EventTarget",
   "HtmlElement",
   "KeyboardEvent",
+  "MediaQueryList",
   "PointerEvent",
   "Window"
 ] }
diff --git a/crates/ui-core/src/lib.rs b/crates/ui-core/src/lib.rs
@@ -6,6 +6,7 @@ extern crate alloc;
 mod id;
 mod event;
 mod input;
+mod preference;
 
 pub use event::{
     radroots_app_ui_compose_event_handlers,
@@ -19,3 +20,9 @@ pub use input::{
     RadrootsAppUiInputModality,
     RadrootsAppUiInputModalityError,
 };
+pub use preference::{
+    radroots_app_ui_prefers_contrast_more,
+    radroots_app_ui_prefers_reduced_motion,
+    RadrootsAppUiPreferenceError,
+    RadrootsAppUiPreferenceResult,
+};
diff --git a/crates/ui-core/src/preference.rs b/crates/ui-core/src/preference.rs
@@ -0,0 +1,58 @@
+use core::fmt;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RadrootsAppUiPreferenceError {
+    WindowMissing,
+    MatchMediaFailed,
+}
+
+impl fmt::Display for RadrootsAppUiPreferenceError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            RadrootsAppUiPreferenceError::WindowMissing => {
+                write!(f, "preference_window_missing")
+            }
+            RadrootsAppUiPreferenceError::MatchMediaFailed => {
+                write!(f, "preference_match_media_failed")
+            }
+        }
+    }
+}
+
+pub type RadrootsAppUiPreferenceResult<T> = Result<T, RadrootsAppUiPreferenceError>;
+
+#[cfg(target_arch = "wasm32")]
+fn radroots_app_ui_prefers(query: &str) -> RadrootsAppUiPreferenceResult<bool> {
+    let window = web_sys::window().ok_or(RadrootsAppUiPreferenceError::WindowMissing)?;
+    let media = window
+        .match_media(query)
+        .map_err(|_| RadrootsAppUiPreferenceError::MatchMediaFailed)?;
+    Ok(media.map(|list| list.matches()).unwrap_or(false))
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+fn radroots_app_ui_prefers(_query: &str) -> RadrootsAppUiPreferenceResult<bool> {
+    Ok(false)
+}
+
+pub fn radroots_app_ui_prefers_reduced_motion() -> RadrootsAppUiPreferenceResult<bool> {
+    radroots_app_ui_prefers("(prefers-reduced-motion: reduce)")
+}
+
+pub fn radroots_app_ui_prefers_contrast_more() -> RadrootsAppUiPreferenceResult<bool> {
+    radroots_app_ui_prefers("(prefers-contrast: more)")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{
+        radroots_app_ui_prefers_contrast_more,
+        radroots_app_ui_prefers_reduced_motion,
+    };
+
+    #[test]
+    fn prefers_helpers_return_result() {
+        let _ = radroots_app_ui_prefers_reduced_motion().expect("reduced motion");
+        let _ = radroots_app_ui_prefers_contrast_more().expect("contrast more");
+    }
+}