Do not read query in embedded web viewer

.vscode/settings.json

@@ -66,5 +66,8 @@
     },
     "[yaml]": {
         "editor.defaultFormatter": "esbenp.prettier-vscode"
-    }
+    },
+    // Uncomment the following option and restart rust-analyzer to get it to check code behind `cfg(target_arch=wasm32)`.
+    // Don't forget to put it in a comment again before committing.
+    // "rust-analyzer.cargo.target": "wasm32-unknown-unknown"
 }

Cargo.lock

@@ -5200,6 +5200,7 @@ dependencies = [
  "image",
  "itertools 0.13.0",
  "js-sys",
+ "parking_lot",
  "poll-promise",
  "re_analytics",
  "re_blueprint_tree",

crates/re_viewer/Cargo.toml

@@ -100,6 +100,7 @@ egui.workspace = true
 ehttp.workspace = true
 image = { workspace = true, default-features = false, features = ["png"] }
 itertools = { workspace = true }
+parking_lot.workspace = true
 poll-promise = { workspace = true, features = ["web"] }
 rfd.workspace = true
 ron.workspace = true
@@ -121,6 +122,7 @@ wasm-bindgen.workspace = true
 web-sys = { workspace = true, features = [
   "History",
   "Location",
+  "PopStateEvent",
   "Storage",
   "Url",
   "UrlSearchParams",

crates/re_viewer/src/app.rs

@@ -80,6 +80,22 @@ pub struct StartupOptions {
 
     /// Default overrides for state of top/side/bottom panels.
     pub panel_state_overrides: PanelStateOverrides,
+
+    /// Whether or not to enable usage of the `History` API on web.
+    ///
+    /// It is disabled by default.
+    ///
+    /// This should only be enabled when it is acceptable for `rerun`
+    /// to push its own entries into browser history.
+    ///
+    /// That only makes sense if it has "taken over" a page, and is
+    /// the only thing on that page. If you are embedding multiple
+    /// viewers onto the same page, then it's better to turn this off.
+    ///
+    /// We use browser history in a limited way to track the currently
+    /// open example recording, see [`crate::history`].
+    #[cfg(target_arch = "wasm32")]
+    pub enable_history: bool,
 }
 
 impl Default for StartupOptions {
@@ -107,6 +123,9 @@ impl Default for StartupOptions {
             fullscreen_options: Default::default(),
 
             panel_state_overrides: Default::default(),
+
+            #[cfg(target_arch = "wasm32")]
+            enable_history: false,
         }
     }
 }
@@ -127,6 +146,9 @@ pub struct App {
     pub(crate) egui_ctx: egui::Context,
     screenshotter: crate::screenshotter::Screenshotter,
 
+    #[cfg(target_arch = "wasm32")]
+    pub(crate) popstate_listener: Option<crate::history::PopstateListener>,
+
     #[cfg(not(target_arch = "wasm32"))]
     profiler: re_tracing::Profiler,
 
@@ -272,6 +294,9 @@ impl App {
             egui_ctx,
             screenshotter,
 
+            #[cfg(target_arch = "wasm32")]
+            popstate_listener: None,
+
             #[cfg(not(target_arch = "wasm32"))]
             profiler: Default::default(),
 
@@ -945,6 +970,11 @@ impl App {
                     if let Some(store_view) = store_context {
                         let entity_db = store_view.recording;
 
+                        #[cfg(target_arch = "wasm32")]
+                        let is_history_enabled = self.startup_options.enable_history;
+                        #[cfg(not(target_arch = "wasm32"))]
+                        let is_history_enabled = false;
+
                         self.state.show(
                             app_blueprint,
                             ui,
@@ -960,6 +990,7 @@ impl App {
                                 hide: self.startup_options.hide_welcome_screen,
                                 opacity: self.welcome_screen_opacity(egui_ctx),
                             },
+                            is_history_enabled,
                         );
                     }
                     render_ctx.before_submit();
@@ -1462,18 +1493,18 @@ impl eframe::App for App {
         }
 
         #[cfg(target_arch = "wasm32")]
-        {
+        if self.startup_options.enable_history {
             // Handle pressing the back/forward mouse buttons explicitly, since eframe catches those.
             let back_pressed =
                 egui_ctx.input(|i| i.pointer.button_pressed(egui::PointerButton::Extra1));
             let fwd_pressed =
                 egui_ctx.input(|i| i.pointer.button_pressed(egui::PointerButton::Extra2));
 
             if back_pressed {
-                crate::web_tools::go_back();
+                crate::history::go_back();
             }
             if fwd_pressed {
-                crate::web_tools::go_forward();
+                crate::history::go_forward();
             }
         }
 

crates/re_viewer/src/app_state.rs

@@ -132,6 +132,7 @@ impl AppState {
         rx: &ReceiveSet<LogMsg>,
         command_sender: &CommandSender,
         welcome_screen_state: &WelcomeScreenState,
+        is_history_enabled: bool,
     ) {
         re_tracing::profile_function!();
 
@@ -417,7 +418,7 @@ impl AppState {
             .frame(viewport_frame)
             .show_inside(ui, |ui| {
                 if show_welcome {
-                    welcome_screen.ui(ui, command_sender, welcome_screen_state);
+                    welcome_screen.ui(ui, command_sender, welcome_screen_state, is_history_enabled);
                 } else {
                     viewport.viewport_ui(ui, &ctx, view_states);
                 }