Remove native screen reader support

Use the "accesskit" feature flag to `eframe` instead.
[AccessKit](https://github.com/AccessKit/accesskit) is the future.

`tts` was a mess to compile on many platforms, so I no longer want
the native `tts` dependency.

Author: emilk

crates/eframe/Cargo.toml

@@ -55,8 +55,10 @@ persistence = [
 ## `eframe` will call `puffin::GlobalProfiler::lock().new_frame()` for you
 puffin = ["dep:puffin", "egui_glow?/puffin", "egui-wgpu?/puffin"]
 
-## Enable screen reader support (requires `ctx.options_mut(|o| o.screen_reader = true);`)
-screen_reader = ["egui-winit/screen_reader", "tts"]
+## Enable screen reader support (requires `ctx.options_mut(|o| o.screen_reader = true);`) on web.
+##
+## For other platforms, use the "accesskit" feature instead.
+web_screen_reader = ["tts"]
 
 ## If set, eframe will look for the env-var `EFRAME_SCREENSHOT_TO` and write a screenshot to that location, and then quit.
 ## This is used to generate images for the examples.

crates/egui-winit/Cargo.toml

@@ -37,9 +37,6 @@ links = ["webbrowser"]
 ## Enable profiling with the [`puffin`](https://docs.rs/puffin) crate.
 puffin = ["dep:puffin"]
 
-## Experimental support for a screen reader.
-screen_reader = ["tts"]
-
 ## Allow serialization of [`WindowSettings`] using [`serde`](https://docs.rs/serde).
 serde = ["egui/serde", "dep:serde"]
 
@@ -67,9 +64,6 @@ accesskit_winit = { version = "0.8.1", optional = true }
 puffin = { version = "0.14", optional = true }
 serde = { version = "1.0", optional = true, features = ["derive"] }
 
-# feature screen_reader
-tts = { version = "0.24", optional = true }
-
 webbrowser = { version = "0.8.3", optional = true }
 
 [target.'cfg(any(target_os="linux", target_os="dragonfly", target_os="freebsd", target_os="netbsd", target_os="openbsd"))'.dependencies]

crates/egui-winit/src/lib.rs

@@ -19,7 +19,6 @@ use egui::accesskit;
 pub use winit;
 
 pub mod clipboard;
-pub mod screen_reader;
 mod window_settings;
 
 pub use window_settings::WindowSettings;
@@ -75,7 +74,6 @@ pub struct State {
     current_pixels_per_point: f32,
 
     clipboard: clipboard::Clipboard,
-    screen_reader: screen_reader::ScreenReader,
 
     /// If `true`, mouse inputs will be treated as touches.
     /// Useful for debugging touch support in egui.
@@ -115,7 +113,6 @@ impl State {
             current_pixels_per_point: 1.0,
 
             clipboard: clipboard::Clipboard::new(wayland_display),
-            screen_reader: screen_reader::ScreenReader::default(),
 
             simulate_touch_screen: false,
             pointer_touch_id: None,
@@ -615,11 +612,6 @@ impl State {
         egui_ctx: &egui::Context,
         platform_output: egui::PlatformOutput,
     ) {
-        if egui_ctx.options(|o| o.screen_reader) {
-            self.screen_reader
-                .speak(&platform_output.events_description());
-        }
-
         let egui::PlatformOutput {
             cursor_icon,
             open_url,

crates/egui-winit/src/screen_reader.rs

@@ -103,9 +103,15 @@ pub struct Options {
     /// Controls the tessellator.
     pub tessellation_options: epaint::TessellationOptions,
 
-    /// This does not at all change the behavior of egui,
-    /// but is a signal to any backend that we want the [`crate::PlatformOutput::events`] read out loud.
+    /// This is a signal to any backend that we want the [`crate::PlatformOutput::events`] read out loud.
+    ///
+    /// The only change to egui is that labels can be focused by pressing tab.
+    ///
     /// Screen readers is an experimental feature of egui, and not supported on all platforms.
+    ///
+    /// `eframe` supports it only on web, using the `web_screen_reader` feature flag,
+    /// but you should consider using [AccessKit](https://github.com/AccessKit/accesskit) instead,
+    /// which `eframe` supports.
     pub screen_reader: bool,
 
     /// If true, the most common glyphs (ASCII) are pre-rendered to the texture atlas.

crates/egui/src/memory.rs

@@ -20,7 +20,7 @@ default = ["glow", "persistence"]
 
 http = ["ehttp", "image", "poll-promise", "egui_extras/image"]
 persistence = ["eframe/persistence", "egui/persistence", "serde"]
-screen_reader = ["eframe/screen_reader"]                          # experimental
+web_screen_reader = ["eframe/web_screen_reader"]                  # experimental
 serde = ["dep:serde", "egui_demo_lib/serde", "egui/serde"]
 syntax_highlighting = ["egui_demo_lib/syntax_highlighting"]
 

crates/egui_demo_app/Cargo.toml

@@ -130,6 +130,8 @@ impl BackendPanel {
 
         ui.separator();
 
+        #[cfg(target_arch = "wasm32")]
+        #[cfg(feature = "web_screen-reader")]
         {
             let mut screen_reader = ui.ctx().options(|o| o.screen_reader);
             ui.checkbox(&mut screen_reader, "🔈 Screen reader").on_hover_text("Experimental feature: checking this will turn on the screen reader on supported platforms");

crates/egui_demo_app/src/backend_panel.rs

@@ -35,9 +35,6 @@ clipboard = ["egui-winit/clipboard"]
 ## Enable opening links in a browser when an egui hyperlink is clicked.
 links = ["egui-winit/links"]
 
-## Experimental support for a screen reader.
-screen_reader = ["egui-winit/screen_reader"]
-
 
 [dependencies]
 egui = { version = "0.20.0", path = "../egui", default-features = false, features = [

crates/egui_glium/Cargo.toml

@@ -37,9 +37,6 @@ clipboard = ["egui-winit?/clipboard"]
 ## enable opening links in a browser when an egui hyperlink is clicked.
 links = ["egui-winit?/links"]
 
-## Experimental support for a screen reader.
-screen_reader = ["egui-winit?/screen_reader"]
-
 ## Enable profiling with the [`puffin`](https://docs.rs/puffin) crate.
 puffin = ["dep:puffin", "egui-winit?/puffin"]