Routing & Navigation

The blinc_router crate provides cross-platform routing with path matching, navigation history, guards, page transitions, and deep linking.

Setup

#![allow(unused)]
fn main() {
use blinc::router::{RouterBuilder, Route, PageTransition};

let router = RouterBuilder::new()
    .route(Route::new("/").name("home").view(home_page))
    .route(Route::new("/users").name("users").view(users_page)
        .child(Route::new("/:id").name("user").view(user_detail)))
    .route(Route::new("/settings")
        .view(settings_page)
        .transition(PageTransition::modal()))
    .not_found(not_found_page)
    .build();
}

Navigation

#![allow(unused)]
fn main() {
// Push (adds to history)
router.push("/users/42");

// Named route with params
router.push_named("user", &[("id", "42")]);

// Replace (no history entry)
router.replace("/login");

// Back / Forward
router.back();
router.forward();

// Check state
router.can_go_back();
router.current_path();
router.params().get("id");
router.query().get("page");
}

Route Outlet

Place router.outlet() where the page content should render:

#![allow(unused)]
fn main() {
fn build_ui(ctx: &WindowedContext) -> impl ElementBuilder {
    div().flex_col()
        .child(nav_bar(&router))
        .child(router.outlet()) // Current route renders here
}
}

On navigation the outlet swaps its view in place. The scaffold around it (header, nav bar) is left alone, and each navigation builds the view again, even to the same path.

use_router() Hook

Inside route views, use_router() returns the active router:

#![allow(unused)]
fn main() {
fn user_detail(ctx: RouteContext) -> Div {
    let router = use_router(); // Same as ctx.router
    let id = ctx.params.get("id").unwrap_or("?");

    div()
        .child(text(&format!("User #{}", id)))
        .child(
            div().on_click(move |_| router.back())
                .child(text("Back"))
        )
}
}

Nested routers work automatically — use_router() returns whichever router's outlet() is currently building.

Page Transitions

Per-route transitions using Blinc's animation system:

#![allow(unused)]
fn main() {
Route::new("/settings")
    .view(settings_page)
    .transition(PageTransition::slide())      // iOS push style
    .transition(PageTransition::fade())       // Crossfade
    .transition(PageTransition::modal())      // Slide up/down
    .transition(PageTransition::scale())      // Scale in/out
    .transition(PageTransition::none())       // Instant

// Custom with spring physics
    .transition(PageTransition::slide().with_spring(SpringConfig::bouncy()))
}

A route with a transition plays the new page's enter animation and keeps the old page mounted, out of flow at the start of the outlet, until its exit animation is done.

Navigation Guards

Protect routes with guards that allow, redirect, or reject:

#![allow(unused)]
fn main() {
use blinc::router::{NavigationGuard, GuardResult};
use std::sync::Arc;

let auth_guard: NavigationGuard = Arc::new(|_from, _to| {
    if is_authenticated() {
        GuardResult::Allow
    } else {
        GuardResult::Redirect("/login".into())
    }
});

RouterBuilder::new()
    .route(Route::new("/dashboard").view(dashboard).guard(auth_guard))
    .build();
}

Deep Linking

Deep linking is automatic — just build a router and it works on all platforms. RouterBuilder::build() auto-registers the deep link handler and back button.

#![allow(unused)]
fn main() {
// That's it — no platform-specific setup needed in Rust
let router = RouterBuilder::new()
    .route(Route::new("/users/:id").view(user_page))
    .build();
// Deep links to myapp://host/users/42 automatically navigate
}

Platform Configuration

Android — add intent filters in AndroidManifest.xml:

<intent-filter>
    <action android:name="android.intent.action.VIEW" />
    <data android:scheme="myapp" />
</intent-filter>

iOS — add URL types in Info.plist:

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array><string>myapp</string></array>
    </dict>
</array>

Desktop — register a custom URL scheme with the OS:

macOS (Info.plist):

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array><string>myapp</string></array>
    </dict>
</array>

Windows (registry, set up by installer):

HKEY_CLASSES_ROOT\myapp\shell\open\command = "C:\path\to\myapp.exe" "--deep-link=%1"

Linux (.desktop file):

MimeType=x-scheme-handler/myapp
Exec=myapp --deep-link=%u

CLI fallback:

myapp --deep-link=myapp://host/users/42

How It Works

1. RouterBuilder::build() registers a global deep link handler
2. Platform runners auto-dispatch incoming URIs to the handler
3. The router parses the URI and calls push(path)
4. No user code needed beyond building the router

System Back Button

Also automatic — RouterBuilder::build() registers a back button handler.

• Android: system back button navigates back if the router has history
• Desktop: Key::Back dispatches through the back handler stack
• If at the root route, the event propagates (app exits normally)

Route Matching

Express-style path patterns:

Named Routes

Look up routes by name for type-safe navigation:

#![allow(unused)]
fn main() {
// Check if a named route exists
router.path_for("user"); // Some("/users/:id")

// Navigate with params
router.push_named("user", &[("id", "42")]); // → /users/42

// Check if a path matches
router.has_route("/users/42"); // true
}

Tab Navigator

Use the tabs() component from blinc_cn with the router's current path as the active tab:

#![allow(unused)]
fn main() {
use blinc::cn::tabs;

fn app_shell(router: &Router) -> Div {
    // Track active tab via router path
    let active_tab = ctx.use_state_keyed("tab", || router.current_path());

    div().flex_col().w_full().h_full()
        // Content area — router outlet
        .child(router.outlet().flex_grow())
        // Bottom tab bar
        .child(
            tabs(&active_tab)
                .tab("Home", "/", {
                    let r = router.clone();
                    move || r.push("/")
                })
                .tab("Search", "/search", {
                    let r = router.clone();
                    move || r.push("/search")
                })
                .tab("Profile", "/profile", {
                    let r = router.clone();
                    move || r.push("/profile")
                })
        )
}
}

Each tab click calls router.push() which updates the outlet. The tab state stays in sync with the route.

Stack Navigator (Page Stack)

The router maintains a page stack — pages persist in the tree when new pages are pushed on top. Suspended pages have input disabled and are hidden, but their state (scroll position, form values, etc.) is preserved.

#![allow(unused)]
fn main() {
// Renders the page stack — active page visible, suspended pages preserved
router.outlet()
}

When you router.push("/details"):

1. The current page becomes Suspended (opacity 0, pointer_events_none)
2. The new page is pushed as Active on top

When you router.back():

1. The top page is removed from the stack
2. The page below becomes Active again (with preserved state)

Page state

#![allow(unused)]
fn main() {
use blinc::router::PageState;

let pages = router.page_stack();
for page in &pages {
    match page.state {
        PageState::Active => println!("Visible: {}", page.route.path),
        PageState::Suspended => println!("Hidden: {}", page.route.path),
    }
}
}

Entry/exit animations

Use motion() containers inside route views for animated transitions:

#![allow(unused)]
fn main() {
fn user_detail(ctx: RouteContext) -> Div {
    motion()
        .slide_in(SlideDirection::Right, 300)
        .child(
            div().w_full().h_full()
                .child(text(&format!("User #{}", ctx.params.get("id").unwrap_or("?"))))
                .child(
                    div().on_click({
                        let r = ctx.router.clone();
                        move |_| r.back()
                    })
                    .child(text("Back"))
                )
        )
}
}

Nested Route Stacks

Layout routes can contain their own scoped router for sub-navigation. use_router() automatically returns the innermost router:

#![allow(unused)]
fn main() {
fn dashboard_layout(ctx: RouteContext) -> Div {
    // Create a sub-router for dashboard tabs
    let sub_router = RouterBuilder::new()
        .route(Route::new("/").view(dashboard_overview))
        .route(Route::new("/analytics").view(analytics))
        .route(Route::new("/settings").view(settings))
        .initial(&ctx.path) // Start at current sub-path
        .build();

    div().flex_row().w_full().h_full()
        .child(dashboard_sidebar(&sub_router))
        .child(sub_router.outlet()) // Nested outlet — use_router() returns sub_router here
}
}

Bottom Sheet Navigation

Use sheet() from blinc_cn for modal-like navigation that slides up from the bottom:

#![allow(unused)]
fn main() {
use blinc::cn::sheet;

fn show_details(router: &Router, item_id: &str) {
    // Navigate to detail route
    router.push(&format!("/items/{}", item_id));

    // Or show as a bottom sheet overlay
    sheet()
        .title("Item Details")
        .content(move || {
            let router = use_router();
            router.outlet() // Render the matched route inside the sheet
        })
        .show();
}
}

For gesture-dismissable sheets on mobile, the sheet component handles the swipe-down gesture automatically. On dismiss, call router.back():

#![allow(unused)]
fn main() {
sheet()
    .on_close({
        let r = router.clone();
        move || r.back()
    })
    .content(|| detail_view())
    .show();
}

Navigation Patterns Summary