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agent: rust — add preferences webview injection for zero-flash hydration

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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
jake
2026-03-21 10:41:44 +00:00
parent c3a01d217d
commit fa7e812166
3 changed files with 118 additions and 24 deletions
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1
src-tauri/Cargo.toml
View File

@@ -35,3 +35,4 @@ serde_json = "1"
tokio = { version = "1", features = ["rt", "sync"] }
arboard = "3.6.1"
tauri-plugin-mcp = "0.7.1"
sqlx = { version = "0.8", features = ["sqlite", "runtime-tokio"] }

32
src-tauri/src/commands/windows.rs
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@@ -1,5 +1,7 @@
use tauri::{Emitter, Manager, WebviewUrl, WebviewWindowBuilder};
use crate::PreferencesScript;
/// Open a floating always-on-top task window.
#[tauri::command]
pub async fn open_task_window(
@@ -13,7 +15,7 @@ pub async fn open_task_window(
return Ok(());
}
WebviewWindowBuilder::new(
let mut builder = WebviewWindowBuilder::new(
&app,
"tasks-float",
WebviewUrl::App("/float".into()),
@@ -23,9 +25,16 @@ pub async fn open_task_window(
.min_inner_size(400.0, 400.0)
.always_on_top(true)
.decorations(false)
.resizable(true)
.build()
.map_err(|e| e.to_string())?;
.resizable(true);
// Inject preferences before Svelte mounts
if let Some(script) = app.try_state::<PreferencesScript>() {
if !script.0.is_empty() {
builder = builder.initialization_script(&script.0);
}
}
builder.build().map_err(|e| e.to_string())?;
Ok(())
}
@@ -41,7 +50,7 @@ pub async fn open_viewer_window(
return Ok(());
}
WebviewWindowBuilder::new(
let mut builder = WebviewWindowBuilder::new(
&app,
"transcript-viewer",
WebviewUrl::App("/viewer".into()),
@@ -50,9 +59,16 @@ pub async fn open_viewer_window(
.inner_size(600.0, 700.0)
.min_inner_size(450.0, 500.0)
.decorations(false)
.resizable(true)
.build()
.map_err(|e| e.to_string())?;
.resizable(true);
// Inject preferences before Svelte mounts
if let Some(script) = app.try_state::<PreferencesScript>() {
if !script.0.is_empty() {
builder = builder.initialization_script(&script.0);
}
}
builder.build().map_err(|e| e.to_string())?;
Ok(())
}

107
src-tauri/src/lib.rs
View File

@@ -3,15 +3,67 @@ mod tray;
use std::sync::Arc;
use sqlx::SqlitePool;
use tauri::Manager;
use kon_core::types::EngineName;
use kon_storage::{database_path, get_setting, init as init_db, set_setting};
use kon_transcription::LocalEngine;
/// Shared app state holding the transcription engines.
/// Shared app state holding the transcription engines and database pool.
pub struct AppState {
pub whisper_engine: Arc<LocalEngine>,
pub parakeet_engine: Arc<LocalEngine>,
pub db: SqlitePool,
}
/// Holds the preferences init script for injection into secondary windows.
pub struct PreferencesScript(pub String);
/// Build a JavaScript snippet that applies saved preferences to the DOM
/// before Svelte mounts, preventing any flash of unstyled content.
fn build_preferences_script(prefs_json: Option<String>) -> String {
let json = prefs_json.unwrap_or_default();
if json.is_empty() {
return String::new();
}
// Serialise the JSON string as a JS string literal for safe embedding
let js_str = serde_json::to_string(&json).unwrap_or_else(|_| "\"\"".to_string());
format!(
r#"(function() {{
try {{
var p = JSON.parse({js_str});
var el = document.documentElement;
if (p.theme === 'system') {{
el.dataset.theme = window.matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark';
}} else if (p.theme) {{
el.dataset.theme = p.theme;
}}
if (p.zone && p.zone !== 'default') el.dataset.zone = p.zone;
if (p.accessibility) {{
var a = p.accessibility;
var fonts = {{ lexend: "'Lexend', system-ui, sans-serif", atkinson: "'Atkinson Hyperlegible Next', system-ui, sans-serif", opendyslexic: "'OpenDyslexic', system-ui, sans-serif" }};
if (a.fontFamily) {{ el.style.setProperty('--font-family-body', fonts[a.fontFamily] || fonts.lexend); el.dataset.fontFamily = a.fontFamily; }}
if (a.fontSize) el.style.setProperty('--font-size-body', a.fontSize + 'px');
if (a.letterSpacing != null) el.style.setProperty('--letter-spacing-body', a.letterSpacing + 'em');
if (a.lineHeight) el.style.setProperty('--line-height-body', String(a.lineHeight));
if (a.bionicReading) el.dataset.bionicReading = 'true';
if (a.reduceMotion === 'on' || (a.reduceMotion === 'system' && window.matchMedia('(prefers-reduced-motion: reduce)').matches)) el.dataset.reduceMotion = 'true';
}}
}} catch (e) {{ console.warn('Preferences injection failed:', e); }}
}})();"#
)
}
/// Save preferences JSON to the SQLite settings table.
#[tauri::command]
async fn save_preferences(
state: tauri::State<'_, AppState>,
preferences: String,
) -> Result<(), String> {
set_setting(&state.db, "kon_preferences", &preferences)
.await
.map_err(|e| e.to_string())
}
#[cfg_attr(mobile, tauri::mobile_entry_point)]
@@ -20,35 +72,60 @@ pub fn run() {
.plugin(tauri_plugin_opener::init())
.plugin(tauri_plugin_dialog::init())
.plugin(tauri_plugin_global_shortcut::Builder::new().build())
.manage(AppState {
whisper_engine: Arc::new(LocalEngine::new(
EngineName::new("whisper"),
)),
parakeet_engine: Arc::new(LocalEngine::new(
EngineName::new("parakeet"),
)),
})
.setup(|app| {
if let Err(e) = tray::setup(app) {
eprintln!("Failed to setup tray: {e}");
// Initialise database (blocking in setup — runs once at startup)
let db_path = database_path();
let db = tauri::async_runtime::block_on(async {
init_db(&db_path).await
})
.map_err(|e| Box::new(e) as Box<dyn std::error::Error>)?;
// Load saved preferences for webview injection
let prefs_json = tauri::async_runtime::block_on(async {
get_setting(&db, "kon_preferences").await.unwrap_or(None)
});
let init_script = build_preferences_script(prefs_json);
// Apply preferences to the main window (defined in tauri.conf.json)
if let Some(main_window) = app.get_webview_window("main") {
if !init_script.is_empty() {
// Tauri's WebviewWindow.eval() is the standard API for
// running JS in a webview — not the JS eval() function
let _ = main_window.eval(&init_script);
}
// Close-to-tray: hide window instead of exiting
if let Some(main_window) = app.get_webview_window("main") {
let win = main_window.clone();
main_window.on_window_event(move |event| {
if let tauri::WindowEvent::CloseRequested { api, .. } =
event
{
if let tauri::WindowEvent::CloseRequested { api, .. } = event {
api.prevent_close();
let _ = win.hide();
}
});
}
// Store init script for secondary windows (float, viewer)
app.manage(PreferencesScript(init_script));
app.manage(AppState {
whisper_engine: Arc::new(LocalEngine::new(
EngineName::new("whisper"),
)),
parakeet_engine: Arc::new(LocalEngine::new(
EngineName::new("parakeet"),
)),
db,
});
if let Err(e) = tray::setup(app) {
eprintln!("Failed to setup tray: {e}");
}
Ok(())
})
.invoke_handler(tauri::generate_handler![
// Preferences
save_preferences,
// Whisper model management
commands::models::download_model,
commands::models::check_model,