Split out the Egui demo code to new crate `egui_demo_lib`

.github/workflows/rust.yml

@@ -52,7 +52,7 @@ jobs:
       - uses: actions-rs/cargo@v1
         with:
           command: test
-          args: -p egui # Only test egui due to weird build issues with the others
+          args: -p egui -p egui_demo_lib # TODO: fix weird build issues with the others
 
   fmt:
     name: Rustfmt

Cargo.lock

@@ -626,7 +626,6 @@ version = "0.6.0"
 dependencies = [
  "ahash",
  "atomic_refcell",
- "criterion",
  "parking_lot",
  "rusttype",
  "serde",
@@ -638,6 +637,7 @@ name = "egui_demo"
 version = "0.1.0"
 dependencies = [
  "egui",
+ "egui_demo_lib",
  "egui_glium",
  "egui_web",
  "js-sys",
@@ -645,6 +645,14 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "egui_demo_lib"
+version = "0.6.0"
+dependencies = [
+ "criterion",
+ "egui",
+]
+
 [[package]]
 name = "egui_glium"
 version = "0.6.0"

Cargo.toml

@@ -1,5 +1,6 @@
 [workspace]
 members = [
+    "egui_demo_lib",
     "egui_demo",
     "egui_glium",
     "egui_web",

check.sh

@@ -7,7 +7,6 @@ CARGO_INCREMENTAL=0 cargo clippy --workspace --all-targets --all-features --  -D
 cargo test --workspace --all-targets --all-features
 cargo test --workspace --doc
 
-cargo check -p egui --lib --target wasm32-unknown-unknown
 cargo check -p egui_web --lib --target wasm32-unknown-unknown
 cargo check -p egui_demo --lib --target wasm32-unknown-unknown
 cargo check -p example_web --lib --target wasm32-unknown-unknown

egui/Cargo.toml

@@ -26,9 +26,6 @@ rusttype = "0.9"
 serde = { version = "1", features = ["derive"], optional = true }
 serde_json = { version = "1", optional = true }
 
-[dev-dependencies]
-criterion = { version = "0.3", default-features = false }
-
 [features]
 default = ["atomic_refcell", "default_fonts"]
 
@@ -38,7 +35,3 @@ default_fonts = []
 
 # Only needed if you plan to use the same egui::Context from multiple threads.
 multi_threaded = ["parking_lot"]
-
-[[bench]]
-name = "benchmark"
-harness = false

egui/src/context.rs

@@ -676,6 +676,12 @@ impl Context {
 
     // ---------------------------------------------------------------------
 
+    /// Move all the graphics at the given layer.
+    /// Can be used to implement drag-and-drop (see relevant demo).
+    pub fn translate_layer(&self, layer_id: LayerId, delta: Vec2) {
+        self.graphics().list(layer_id).translate(delta);
+    }
+
     pub fn layer_id_at(&self, pos: Pos2) -> Option<LayerId> {
         let resize_grab_radius_side = self.style().interaction.resize_grab_radius_side;
         self.memory().layer_id_at(pos, resize_grab_radius_side)

egui/src/layout.rs

@@ -130,15 +130,6 @@ impl Default for Layout {
 }
 
 impl Layout {
-    pub(crate) fn from_main_dir_and_cross_align(main_dir: Direction, cross_align: Align) -> Self {
-        Self {
-            main_dir,
-            main_wrap: false,
-            cross_align,
-            cross_justify: false,
-        }
-    }
-
     pub fn left_to_right() -> Self {
         Self {
             main_dir: Direction::LeftToRight,
@@ -180,6 +171,15 @@ impl Layout {
         }
     }
 
+    pub fn from_main_dir_and_cross_align(main_dir: Direction, cross_align: Align) -> Self {
+        Self {
+            main_dir,
+            main_wrap: false,
+            cross_align,
+            cross_justify: false,
+        }
+    }
+
     #[deprecated = "Use `top_down`"]
     pub fn vertical(cross_align: Align) -> Self {
         Self::top_down(cross_align)

egui/src/lib.rs

@@ -82,7 +82,6 @@ mod animation_manager;
 pub mod app;
 pub mod containers;
 mod context;
-pub mod demos;
 mod id;
 mod input;
 mod introspection;
@@ -103,7 +102,6 @@ pub use {
     align::Align,
     containers::*,
     context::{Context, CtxRef},
-    demos::DemoApp,
     id::Id,
     input::*,
     layers::*,
@@ -122,28 +120,50 @@ pub use {
     widgets::*,
 };
 
+// ----------------------------------------------------------------------------
+
 #[cfg(debug_assertions)]
-pub(crate) fn has_debug_assertions() -> bool {
+pub(crate) const fn has_debug_assertions() -> bool {
     true
 }
 
 #[cfg(not(debug_assertions))]
-pub(crate) fn has_debug_assertions() -> bool {
+pub(crate) const fn has_debug_assertions() -> bool {
     false
 }
 
-#[test]
-fn test_egui_e2e() {
-    let mut demo_windows = crate::demos::DemoWindows::default();
-    let mut ctx = crate::CtxRef::default();
-    let raw_input = crate::RawInput::default();
-
-    const NUM_FRAMES: usize = 5;
-    for _ in 0..NUM_FRAMES {
-        ctx.begin_frame(raw_input.clone());
-        demo_windows.ui(&ctx, &Default::default(), &mut None, |_ui| {});
-        let (_output, paint_commands) = ctx.end_frame();
-        let paint_jobs = ctx.tessellate(paint_commands);
-        assert!(!paint_jobs.is_empty());
+/// Helper function that adds a label when compiling with debug assertions enabled.
+pub fn warn_if_debug_build(ui: &mut crate::Ui) {
+    if crate::has_debug_assertions() {
+        ui.label(
+            crate::Label::new("‼ Debug build ‼")
+                .small()
+                .text_color(crate::color::RED),
+        )
+        .on_hover_text("Egui was compiled with debug assertions enabled.");
     }
 }
+
+// ----------------------------------------------------------------------------
+
+/// Create a [`Hyperlink`](crate::Hyperlink) to this file (and line) on Github
+///
+/// Example: `ui.add(github_link_file_line!("https://github.com/YOUR/PROJECT/blob/master/", "(source code)"));`
+#[macro_export]
+macro_rules! github_link_file_line {
+    ($github_url:expr, $label:expr) => {{
+        let url = format!("{}{}#L{}", $github_url, file!(), line!());
+        $crate::Hyperlink::new(url).text($label)
+    }};
+}
+
+/// Create a [`Hyperlink`](crate::Hyperlink) to this file on github.
+///
+/// Example: `ui.add(github_link_file!("https://github.com/YOUR/PROJECT/blob/master/", "(source code)"));`
+#[macro_export]
+macro_rules! github_link_file {
+    ($github_url:expr, $label:expr) => {{
+        let url = format!("{}{}", $github_url, file!());
+        $crate::Hyperlink::new(url).text($label)
+    }};
+}

egui_demo/Cargo.toml

@@ -10,6 +10,7 @@ crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 egui = { path = "../egui", features = ["serde", "serde_json"] }
+egui_demo_lib = { path = "../egui_demo_lib" }
 serde = { version = "1", features = ["derive"] }
 
 # For compiling natively:

egui_demo/src/lib.rs

@@ -12,7 +12,7 @@ use wasm_bindgen::prelude::*;
 #[cfg(target_arch = "wasm32")]
 #[wasm_bindgen]
 pub fn start(canvas_id: &str) -> Result<(), wasm_bindgen::JsValue> {
-    let app = egui::DemoApp::default();
+    let app = egui_demo_lib::DemoApp::default();
     egui_web::start(canvas_id, Box::new(app))?;
     Ok(())
 }

egui_demo/src/main.rs

@@ -4,6 +4,6 @@
 
 // When compiling natively:
 fn main() {
-    let app = egui::DemoApp::default();
+    let app = egui_demo_lib::DemoApp::default();
     egui_glium::run(Box::new(app));
 }

egui_demo_lib/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "egui_demo_lib"
+version = "0.6.0"
+authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
+description = "Example library for Egui"
+edition = "2018"
+homepage = "https://github.com/emilk/egui"
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/emilk/egui"
+categories = ["gui", "graphics"]
+keywords = ["glium", "egui", "gui", "gamedev"]
+include = [ "**/*.rs", "Cargo.toml"]
+
+[lib]
+
+[dependencies]
+egui = { version = "0.6.0", path = "../egui" }
+
+[dev-dependencies]
+criterion = { version = "0.3", default-features = false }
+
+[[bench]]
+name = "benchmark"
+harness = false

egui_demo_lib/README.md

@@ -0,0 +1,8 @@
+# Egui Demo Library
+
+This crate contains example code for Egui.
+
+It is in a separate crate for two reasons:
+
+* To ensure it only uses the public `egui` API.
+* To remove the amount of code in `egui` proper.

egui/benches/benchmark.rs → egui_demo_lib/benches/benchmark.rs

@@ -5,7 +5,7 @@ pub fn criterion_benchmark(c: &mut Criterion) {
 
     {
         let mut ctx = egui::CtxRef::default();
-        let mut demo_windows = egui::demos::DemoWindows::default();
+        let mut demo_windows = egui_demo_lib::DemoWindows::default();
 
         c.bench_function("demo_windows_minimal", |b| {
             b.iter(|| {
@@ -19,7 +19,7 @@ pub fn criterion_benchmark(c: &mut Criterion) {
     {
         let mut ctx = egui::CtxRef::default();
         ctx.memory().all_collpasing_are_open = true; // expand the demo window with everything
-        let mut demo_windows = egui::demos::DemoWindows::default();
+        let mut demo_windows = egui_demo_lib::DemoWindows::default();
 
         c.bench_function("demo_windows_full", |b| {
             b.iter(|| {
@@ -33,7 +33,7 @@ pub fn criterion_benchmark(c: &mut Criterion) {
     {
         let mut ctx = egui::CtxRef::default();
         ctx.memory().all_collpasing_are_open = true; // expand the demo window with everything
-        let mut demo_windows = egui::demos::DemoWindows::default();
+        let mut demo_windows = egui_demo_lib::DemoWindows::default();
         ctx.begin_frame(raw_input.clone());
         demo_windows.ui(&ctx, &Default::default(), &mut None, |_ui| {});
         let (_, paint_commands) = ctx.end_frame();
@@ -49,7 +49,7 @@ pub fn criterion_benchmark(c: &mut Criterion) {
         egui::CentralPanel::default().show(&ctx, |ui| {
             c.bench_function("label", |b| {
                 b.iter(|| {
-                    ui.label(egui::demos::LOREM_IPSUM_LONG);
+                    ui.label(egui_demo_lib::LOREM_IPSUM_LONG);
                 })
             });
         });

egui/src/demos/app.rs → egui_demo_lib/src/app.rs

@@ -1,4 +1,4 @@
-use crate::{app, demos, util::History, CtxRef, Response, Ui};
+use egui::{util::History, *};
 
 // ----------------------------------------------------------------------------
 
@@ -90,9 +90,9 @@ impl FrameHistory {
             "Includes Egui layout and tessellation time.\n\
             Does not include GPU usage, nor overhead for sending data to GPU.",
         );
-        crate::demos::warn_if_debug_build(ui);
+        egui::warn_if_debug_build(ui);
 
-        crate::CollapsingHeader::new("📊 CPU usage history")
+        egui::CollapsingHeader::new("📊 CPU usage history")
             .default_open(false)
             .show(ui, |ui| {
                 self.graph(ui);
@@ -100,8 +100,6 @@ impl FrameHistory {
     }
 
     fn graph(&mut self, ui: &mut Ui) -> Response {
-        use crate::*;
-
         let graph_top_cpu_usage = 0.010;
         ui.label("Egui CPU usage history");
 
@@ -179,7 +177,7 @@ impl FrameHistory {
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]
 pub struct DemoApp {
-    demo_windows: demos::DemoWindows,
+    demo_windows: crate::DemoWindows,
 
     backend_window_open: bool,
 
@@ -236,7 +234,7 @@ impl DemoApp {
             .or_else(|| Some(ui.ctx().pixels_per_point()));
         if let Some(pixels_per_point) = &mut self.pixels_per_point {
             ui.add(
-                crate::Slider::f32(pixels_per_point, 0.5..=5.0)
+                egui::Slider::f32(pixels_per_point, 0.5..=5.0)
                     .logarithmic(true)
                     .text("Scale (physical pixels per point)"),
             );
@@ -286,16 +284,16 @@ impl app::App for DemoApp {
     }
 
     #[cfg(feature = "serde_json")]
-    fn load(&mut self, storage: &dyn crate::app::Storage) {
-        *self = crate::app::get_value(storage, crate::app::APP_KEY).unwrap_or_default()
+    fn load(&mut self, storage: &dyn egui::app::Storage) {
+        *self = egui::app::get_value(storage, egui::app::APP_KEY).unwrap_or_default()
     }
 
     #[cfg(feature = "serde_json")]
-    fn save(&mut self, storage: &mut dyn crate::app::Storage) {
-        crate::app::set_value(storage, crate::app::APP_KEY, self);
+    fn save(&mut self, storage: &mut dyn egui::app::Storage) {
+        egui::app::set_value(storage, egui::app::APP_KEY, self);
     }
 
-    fn ui(&mut self, ctx: &CtxRef, integration_context: &mut crate::app::IntegrationContext<'_>) {
+    fn ui(&mut self, ctx: &CtxRef, integration_context: &mut egui::app::IntegrationContext<'_>) {
         self.frame_history
             .on_new_frame(ctx.input().time, integration_context.info.cpu_usage);
 
@@ -307,12 +305,12 @@ impl app::App for DemoApp {
             .unwrap_or_default();
 
         let link = if web_location_hash == "clock" {
-            Some(demos::DemoLink::Clock)
+            Some(crate::DemoLink::Clock)
         } else {
             None
         };
 
-        let demo_environment = demos::DemoEnvironment {
+        let demo_environment = crate::DemoEnvironment {
             seconds_since_midnight: integration_context.info.seconds_since_midnight,
             link,
         };
@@ -339,7 +337,7 @@ impl app::App for DemoApp {
         );
 
         let mut backend_window_open = self.backend_window_open;
-        crate::Window::new("💻 Backend")
+        egui::Window::new("💻 Backend")
             .min_width(360.0)
             .scroll(false)
             .open(&mut backend_window_open)

egui/src/demos/color_test.rs → egui_demo_lib/src/color_test.rs

@@ -1,6 +1,4 @@
-use crate::widgets::color_picker::show_color;
-use crate::*;
-use color::*;
+use egui::{color::*, widgets::color_picker::show_color, *};
 use std::collections::HashMap;
 
 const GRADIENT_SIZE: Vec2 = vec2(256.0, 24.0);
@@ -266,7 +264,7 @@ impl ColorTest {
 }
 
 fn vertex_gradient(ui: &mut Ui, bg_fill: Srgba, gradient: &Gradient) -> Response {
-    use crate::paint::*;
+    use egui::paint::*;
     let response = ui.allocate_response(GRADIENT_SIZE, Sense::hover());
     if bg_fill != Default::default() {
         let mut triangles = Triangles::default();
@@ -324,12 +322,12 @@ impl Gradient {
             (0..=n)
                 .map(|i| {
                     let t = i as f32 / n as f32;
-                    Srgba([
+                    Srgba::from_rgba_premultiplied(
                         lerp((left[0] as f32)..=(right[0] as f32), t).round() as u8, // Don't ever do this please!
                         lerp((left[1] as f32)..=(right[1] as f32), t).round() as u8, // Don't ever do this please!
                         lerp((left[2] as f32)..=(right[2] as f32), t).round() as u8, // Don't ever do this please!
                         lerp((left[3] as f32)..=(right[3] as f32), t).round() as u8, // Don't ever do this please!
-                    ])
+                    )
                 })
                 .collect(),
         )

egui/src/demos/dancing_strings.rs → egui_demo_lib/src/dancing_strings.rs

@@ -1,4 +1,4 @@
-use crate::{containers::*, demos::*, *};
+use egui::{containers::*, *};
 
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]
@@ -10,12 +10,13 @@ impl Default for DancingStrings {
     }
 }
 
-impl Demo for DancingStrings {
+impl crate::Demo for DancingStrings {
     fn name(&self) -> &str {
         "♫ Dancing Strings"
     }
 
     fn show(&mut self, ctx: &CtxRef, open: &mut bool) {
+        use crate::View;
         Window::new(self.name())
             .open(open)
             .default_size(vec2(512.0, 256.0))
@@ -24,7 +25,7 @@ impl Demo for DancingStrings {
     }
 }
 
-impl View for DancingStrings {
+impl crate::View for DancingStrings {
     fn ui(&mut self, ui: &mut Ui) {
         Frame::dark_canvas(ui.style()).show(ui, |ui| {
             ui.ctx().request_repaint();
@@ -62,6 +63,6 @@ impl View for DancingStrings {
 
             ui.painter().extend(cmds);
         });
-        ui.add(__egui_github_link_file!());
+        ui.add(crate::__egui_github_link_file!());
     }
 }

egui/src/demos/demo_window.rs → egui_demo_lib/src/demo_window.rs

@@ -1,4 +1,5 @@
-use crate::{color::*, demos::*, *};
+use crate::*;
+use egui::{color::*, *};
 
 /// Showcase some ui code
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
@@ -221,8 +222,6 @@ impl BoxPainting {
 
 // ----------------------------------------------------------------------------
 
-use crate::layout::*;
-
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]
 struct LayoutDemo {

egui/src/demos/demo_windows.rs → egui_demo_lib/src/demo_windows.rs

@@ -1,8 +1,4 @@
-use crate::{
-    app,
-    demos::{self, Demo},
-    CtxRef, Resize, ScrollArea, Ui, Window,
-};
+use egui::{app, CtxRef, Resize, ScrollArea, Ui, Window};
 
 // ----------------------------------------------------------------------------
 
@@ -29,17 +25,17 @@ pub struct DemoEnvironment {
 struct Demos {
     /// open, view
     #[cfg_attr(feature = "serde", serde(skip))] // TODO: serialize the `open` state.
-    demos: Vec<(bool, Box<dyn Demo>)>,
+    demos: Vec<(bool, Box<dyn crate::Demo>)>,
 }
 impl Default for Demos {
     fn default() -> Self {
         Self {
             demos: vec![
-                (false, Box::new(crate::demos::FontBook::default())),
-                (false, Box::new(crate::demos::Painting::default())),
-                (false, Box::new(crate::demos::DancingStrings::default())),
-                (false, Box::new(crate::demos::DragAndDropDemo::default())),
-                (false, Box::new(crate::demos::Tests::default())),
+                (false, Box::new(crate::FontBook::default())),
+                (false, Box::new(crate::Painting::default())),
+                (false, Box::new(crate::DancingStrings::default())),
+                (false, Box::new(crate::DragAndDropDemo::default())),
+                (false, Box::new(crate::Tests::default())),
             ],
         }
     }
@@ -67,12 +63,12 @@ impl Demos {
 pub struct DemoWindows {
     open_windows: OpenWindows,
 
-    demo_window: demos::DemoWindow,
+    demo_window: crate::DemoWindow,
 
     #[cfg_attr(feature = "serde", serde(skip))]
-    color_test: demos::ColorTest,
+    color_test: crate::ColorTest,
 
-    fractal_clock: demos::FractalClock,
+    fractal_clock: crate::FractalClock,
 
     /// open, title, view
     demos: Demos,
@@ -104,16 +100,16 @@ impl DemoWindows {
             self.previous_link = env.link;
         }
 
-        crate::SidePanel::left("side_panel", 190.0).show(ctx, |ui| {
+        egui::SidePanel::left("side_panel", 190.0).show(ctx, |ui| {
             ui.heading("✒ Egui Demo");
-            crate::demos::warn_if_debug_build(ui);
+            egui::warn_if_debug_build(ui);
 
             ui.separator();
 
             ScrollArea::auto_sized().show(ui, |ui| {
                 ui.label("Egui is an immediate mode GUI library written in Rust.");
                 ui.add(
-                    crate::Hyperlink::new("https://github.com/emilk/egui").text(" Egui home page"),
+                    egui::Hyperlink::new("https://github.com/emilk/egui").text(" Egui home page"),
                 );
 
                 ui.label("Egui can be run on the web, or natively on 🐧");
@@ -136,7 +132,7 @@ impl DemoWindows {
             });
         });
 
-        crate::TopPanel::top("menu_bar").show(ctx, |ui| {
+        egui::TopPanel::top("menu_bar").show(ctx, |ui| {
             show_menu_bar(ui, &mut self.open_windows, env.seconds_since_midnight);
         });
 
@@ -215,7 +211,7 @@ impl DemoWindows {
             .show(ctx, |ui| {
                 ui.label("scroll:    NO");
                 ui.label("resizable: YES");
-                ui.label(demos::LOREM_IPSUM);
+                ui.label(crate::LOREM_IPSUM);
             });
 
         Window::new("resizable + embedded scroll")
@@ -228,8 +224,8 @@ impl DemoWindows {
                 ui.label("resizable: YES");
                 ui.heading("We have a sub-region with scroll bar:");
                 ScrollArea::auto_sized().show(ui, |ui| {
-                    ui.label(demos::LOREM_IPSUM_LONG);
-                    ui.label(demos::LOREM_IPSUM_LONG);
+                    ui.label(crate::LOREM_IPSUM_LONG);
+                    ui.label(crate::LOREM_IPSUM_LONG);
                 });
                 // ui.heading("Some additional text here, that should also be visible"); // this works, but messes with the resizing a bit
             });
@@ -242,7 +238,7 @@ impl DemoWindows {
             .show(ctx, |ui| {
                 ui.label("scroll:    YES");
                 ui.label("resizable: YES");
-                ui.label(demos::LOREM_IPSUM_LONG);
+                ui.label(crate::LOREM_IPSUM_LONG);
             });
 
         Window::new("auto_sized")
@@ -252,7 +248,7 @@ impl DemoWindows {
                 ui.label("This window will auto-size based on its contents.");
                 ui.heading("Resize this area:");
                 Resize::default().show(ui, |ui| {
-                    ui.label(demos::LOREM_IPSUM);
+                    ui.label(crate::LOREM_IPSUM);
                 });
                 ui.heading("Resize the above area!");
             });
@@ -327,7 +323,7 @@ impl OpenWindows {
 }
 
 fn show_menu_bar(ui: &mut Ui, windows: &mut OpenWindows, seconds_since_midnight: Option<f64>) {
-    use crate::*;
+    use egui::*;
 
     menu::bar(ui, |ui| {
         menu::menu(ui, "File", |ui| {

egui/src/demos/drag_and_drop.rs → egui_demo_lib/src/drag_and_drop.rs

@@ -1,7 +1,4 @@
-use crate::{
-    demos::{Demo, View},
-    *,
-};
+use egui::*;
 
 pub fn drag_source(ui: &mut Ui, id: Id, body: impl FnOnce(&mut Ui)) {
     let is_being_dragged = ui.memory().is_being_dragged(id);
@@ -18,7 +15,7 @@ pub fn drag_source(ui: &mut Ui, id: Id, body: impl FnOnce(&mut Ui)) {
         ui.output().cursor_icon = CursorIcon::Grabbing;
 
         // Paint the body to a new layer:
-        let layer_id = LayerId::new(layers::Order::Tooltip, id);
+        let layer_id = LayerId::new(Order::Tooltip, id);
         let response = ui.with_layer_id(layer_id, body).1;
 
         // Now we move the visuals of the body to where the mouse is.
@@ -30,7 +27,7 @@ pub fn drag_source(ui: &mut Ui, id: Id, body: impl FnOnce(&mut Ui)) {
 
         if let Some(mouse_pos) = ui.input().mouse.pos {
             let delta = mouse_pos - response.rect.center();
-            ui.ctx().graphics().list(layer_id).translate(delta);
+            ui.ctx().translate_layer(layer_id, delta);
         }
     }
 }
@@ -92,12 +89,13 @@ impl Default for DragAndDropDemo {
     }
 }
 
-impl Demo for DragAndDropDemo {
+impl crate::Demo for DragAndDropDemo {
     fn name(&self) -> &str {
         "✋ Drag and Drop"
     }
 
     fn show(&mut self, ctx: &CtxRef, open: &mut bool) {
+        use crate::View;
         Window::new(self.name())
             .open(open)
             .default_size(vec2(256.0, 256.0))
@@ -107,7 +105,7 @@ impl Demo for DragAndDropDemo {
     }
 }
 
-impl View for DragAndDropDemo {
+impl crate::View for DragAndDropDemo {
     fn ui(&mut self, ui: &mut Ui) {
         ui.label("This is a proof-of-concept of drag-and-drop in Egui");
         ui.label("Drag items between columns.");
@@ -153,6 +151,6 @@ impl View for DragAndDropDemo {
             }
         }
 
-        ui.add(__egui_github_link_file!());
+        ui.add(crate::__egui_github_link_file!());
     }
 }

egui/src/demos/font_book.rs → egui_demo_lib/src/font_book.rs

@@ -1,10 +1,8 @@
-use crate::*;
-
 pub struct FontBook {
     standard: bool,
     emojis: bool,
     filter: String,
-    text_style: TextStyle,
+    text_style: egui::TextStyle,
 }
 
 impl Default for FontBook {
@@ -13,13 +11,14 @@ impl Default for FontBook {
             standard: false,
             emojis: true,
             filter: Default::default(),
-            text_style: TextStyle::Button,
+            text_style: egui::TextStyle::Button,
         }
     }
 }
 
 impl FontBook {
-    fn characters_ui(&self, ui: &mut Ui, characters: &[(u32, char, &str)]) {
+    fn characters_ui(&self, ui: &mut egui::Ui, characters: &[(u32, char, &str)]) {
+        use egui::{Button, Label};
         for &(_, chr, name) in characters {
             if self.filter.is_empty()
                 || name.contains(&self.filter)
@@ -27,7 +26,7 @@ impl FontBook {
             {
                 let button = Button::new(chr).text_style(self.text_style).frame(false);
 
-                let tooltip_ui = |ui: &mut Ui| {
+                let tooltip_ui = |ui: &mut egui::Ui| {
                     ui.add(Label::new(chr).text_style(self.text_style));
                     ui.label(format!("{}\nU+{:X}\n\nClick to copy", name, chr as u32));
                 };
@@ -40,23 +39,23 @@ impl FontBook {
     }
 }
 
-impl demos::Demo for FontBook {
+impl crate::Demo for FontBook {
     fn name(&self) -> &str {
         "🔤 Font Book"
     }
 
-    fn show(&mut self, ctx: &crate::CtxRef, open: &mut bool) {
-        Window::new(self.name()).open(open).show(ctx, |ui| {
-            use demos::View;
+    fn show(&mut self, ctx: &egui::CtxRef, open: &mut bool) {
+        egui::Window::new(self.name()).open(open).show(ctx, |ui| {
+            use crate::View;
             self.ui(ui);
         });
     }
 }
 
-impl demos::View for FontBook {
-    fn ui(&mut self, ui: &mut Ui) {
-        use crate::demos::font_contents_emoji::FULL_EMOJI_LIST;
-        use crate::demos::font_contents_ubuntu::UBUNTU_FONT_CHARACTERS;
+impl crate::View for FontBook {
+    fn ui(&mut self, ui: &mut egui::Ui) {
+        use crate::font_contents_emoji::FULL_EMOJI_LIST;
+        use crate::font_contents_ubuntu::UBUNTU_FONT_CHARACTERS;
 
         ui.label(format!(
             "Egui supports {} standard characters and {} emojis.\nClick on a character to copy it.",
@@ -66,8 +65,8 @@ impl demos::View for FontBook {
 
         ui.separator();
 
-        combo_box_with_label(ui, "Text style", format!("{:?}", self.text_style), |ui| {
-            for style in TextStyle::all() {
+        egui::combo_box_with_label(ui, "Text style", format!("{:?}", self.text_style), |ui| {
+            for style in egui::TextStyle::all() {
                 ui.selectable_value(&mut self.text_style, style, format!("{:?}", style));
             }
         });
@@ -89,9 +88,9 @@ impl demos::View for FontBook {
 
         ui.separator();
 
-        crate::ScrollArea::auto_sized().show(ui, |ui| {
+        egui::ScrollArea::auto_sized().show(ui, |ui| {
             ui.horizontal_wrapped(|ui| {
-                ui.style_mut().spacing.item_spacing = Vec2::splat(2.0);
+                ui.style_mut().spacing.item_spacing = egui::Vec2::splat(2.0);
 
                 if self.standard {
                     self.characters_ui(ui, UBUNTU_FONT_CHARACTERS);

egui/src/demos/fractal_clock.rs → egui_demo_lib/src/fractal_clock.rs

@@ -1,4 +1,4 @@
-use crate::{containers::*, widgets::*, *};
+use egui::{containers::*, widgets::*, *};
 use std::f32::consts::TAU;
 
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]

egui/src/demos/mod.rs → egui_demo_lib/src/lib.rs

@@ -1,6 +1,52 @@
 //! Demo-code for showing how Egui is used.
 //!
 //! The demo-code is also used in benchmarks and tests.
+
+#![cfg_attr(not(debug_assertions), deny(warnings))] // Forbid warnings in release builds
+#![forbid(unsafe_code)]
+#![warn(
+    clippy::all,
+    clippy::await_holding_lock,
+    clippy::dbg_macro,
+    clippy::doc_markdown,
+    clippy::empty_enum,
+    clippy::enum_glob_use,
+    clippy::exit,
+    clippy::filter_map_next,
+    clippy::fn_params_excessive_bools,
+    clippy::if_let_mutex,
+    clippy::imprecise_flops,
+    clippy::inefficient_to_string,
+    clippy::linkedlist,
+    clippy::lossy_float_literal,
+    clippy::macro_use_imports,
+    clippy::match_on_vec_items,
+    clippy::match_wildcard_for_single_variants,
+    clippy::mem_forget,
+    clippy::mismatched_target_os,
+    clippy::missing_errors_doc,
+    clippy::missing_safety_doc,
+    clippy::needless_borrow,
+    clippy::needless_continue,
+    clippy::needless_pass_by_value,
+    clippy::option_option,
+    clippy::pub_enum_variant_names,
+    clippy::rest_pat_in_fully_bound_structs,
+    clippy::todo,
+    clippy::unimplemented,
+    clippy::unnested_or_patterns,
+    clippy::verbose_file_reads,
+    future_incompatible,
+    missing_crate_level_docs,
+    missing_doc_code_examples,
+    // missing_docs,
+    nonstandard_style,
+    rust_2018_idioms,
+    unused_doc_comments,
+)]
+
+// ----------------------------------------------------------------------------
+
 mod app;
 mod color_test;
 mod dancing_strings;
@@ -34,7 +80,7 @@ Curabitur pretium tincidunt lacus. Nulla gravida orci a odio. Nullam varius, tur
 
 /// Something to view in the demo windows
 pub trait View {
-    fn ui(&mut self, ui: &mut crate::Ui);
+    fn ui(&mut self, ui: &mut egui::Ui);
 }
 
 /// Something to view
@@ -42,55 +88,20 @@ pub trait Demo {
     fn name(&self) -> &str;
 
     /// Show windows, etc
-    fn show(&mut self, ctx: &crate::CtxRef, open: &mut bool);
+    fn show(&mut self, ctx: &egui::CtxRef, open: &mut bool);
 }
 
 // ----------------------------------------------------------------------------
 
-pub fn warn_if_debug_build(ui: &mut crate::Ui) {
-    if crate::has_debug_assertions() {
-        ui.label(
-            crate::Label::new("‼ Debug build ‼")
-                .small()
-                .text_color(crate::color::RED),
-        )
-        .on_hover_text("Egui was compiled with debug assertions enabled.");
-    }
-}
-
-// ----------------------------------------------------------------------------
-
-/// Create a [`Hyperlink`](crate::Hyperlink) to this file (and line) on Github
-///
-/// Example: `ui.add(github_link_file_line!("https://github.com/YOUR/PROJECT/blob/master/", "(source code)"));`
-#[macro_export]
-macro_rules! github_link_file_line {
-    ($github_url:expr, $label:expr) => {{
-        let url = format!("{}{}#L{}", $github_url, file!(), line!());
-        $crate::Hyperlink::new(url).text($label)
-    }};
-}
-
-/// Create a [`Hyperlink`](crate::Hyperlink) to this file on github.
-///
-/// Example: `ui.add(github_link_file!("https://github.com/YOUR/PROJECT/blob/master/", "(source code)"));`
-#[macro_export]
-macro_rules! github_link_file {
-    ($github_url:expr, $label:expr) => {{
-        let url = format!("{}{}", $github_url, file!());
-        $crate::Hyperlink::new(url).text($label)
-    }};
-}
-
 /// Create a [`Hyperlink`](crate::Hyperlink) to this egui source code file on github.
 #[doc(hidden)]
 #[macro_export]
 macro_rules! __egui_github_link_file {
     () => {
-        __egui_github_link_file!("(source code)")
+        crate::__egui_github_link_file!("(source code)")
     };
     ($label:expr) => {
-        github_link_file!("https://github.com/emilk/egui/blob/master/", $label).small()
+        egui::github_link_file!("https://github.com/emilk/egui/blob/master/", $label).small()
     };
 }
 
@@ -99,9 +110,27 @@ macro_rules! __egui_github_link_file {
 #[macro_export]
 macro_rules! __egui_github_link_file_line {
     () => {
-        __egui_github_link_file_line!("(source code)")
+        crate::__egui_github_link_file_line!("(source code)")
     };
     ($label:expr) => {
-        github_link_file_line!("https://github.com/emilk/egui/blob/master/", $label).small()
+        egui::github_link_file_line!("https://github.com/emilk/egui/blob/master/", $label).small()
     };
 }
+
+// ----------------------------------------------------------------------------
+
+#[test]
+fn test_egui_e2e() {
+    let mut demo_windows = crate::DemoWindows::default();
+    let mut ctx = egui::CtxRef::default();
+    let raw_input = egui::RawInput::default();
+
+    const NUM_FRAMES: usize = 5;
+    for _ in 0..NUM_FRAMES {
+        ctx.begin_frame(raw_input.clone());
+        demo_windows.ui(&ctx, &Default::default(), &mut None, |_ui| {});
+        let (_output, paint_commands) = ctx.end_frame();
+        let paint_jobs = ctx.tessellate(paint_commands);
+        assert!(!paint_jobs.is_empty());
+    }
+}

egui/src/demos/painting.rs → egui_demo_lib/src/painting.rs

@@ -1,4 +1,5 @@
-use crate::{demos::*, *};
+use crate::*;
+use egui::*;
 
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]
@@ -58,7 +59,7 @@ impl Painting {
     }
 }
 
-impl demos::Demo for Painting {
+impl crate::Demo for Painting {
     fn name(&self) -> &str {
         "🖊 Painting"
     }
@@ -72,9 +73,9 @@ impl demos::Demo for Painting {
     }
 }
 
-impl demos::View for Painting {
+impl crate::View for Painting {
     fn ui(&mut self, ui: &mut Ui) {
-        ui.add(__egui_github_link_file!("(source code)"));
+        ui.add(crate::__egui_github_link_file!("(source code)"));
         self.ui_control(ui);
         ui.label("Paint with your mouse/touch!");
         Frame::dark_canvas(ui.style()).show(ui, |ui| {

egui/src/demos/scrolls.rs → egui_demo_lib/src/scrolls.rs

@@ -1,4 +1,5 @@
-use crate::{color::*, demos::LOREM_IPSUM_LONG, *};
+use crate::LOREM_IPSUM_LONG;
+use egui::{color::*, *};
 
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]

egui/src/demos/sliders.rs → egui_demo_lib/src/sliders.rs

@@ -1,4 +1,4 @@
-use crate::*;
+use egui::*;
 use std::f64::INFINITY;
 
 /// Showcase sliders

egui/src/demos/tests.rs → egui_demo_lib/src/tests.rs

@@ -1,23 +1,21 @@
-use crate::*;
-
 #[derive(Default)]
 pub struct Tests {}
 
-impl demos::Demo for Tests {
+impl crate::Demo for Tests {
     fn name(&self) -> &str {
         "📋 Tests"
     }
 
-    fn show(&mut self, ctx: &crate::CtxRef, open: &mut bool) {
-        Window::new(self.name()).open(open).show(ctx, |ui| {
-            use demos::View;
+    fn show(&mut self, ctx: &egui::CtxRef, open: &mut bool) {
+        egui::Window::new(self.name()).open(open).show(ctx, |ui| {
+            use crate::View;
             self.ui(ui);
         });
     }
 }
 
-impl demos::View for Tests {
-    fn ui(&mut self, ui: &mut Ui) {
+impl crate::View for Tests {
+    fn ui(&mut self, ui: &mut egui::Ui) {
         ui.heading("Name collision example");
 
         ui.label("\
@@ -46,6 +44,6 @@ impl demos::View for Tests {
         let _ = ui.button("Button");
         let _ = ui.button("Button");
 
-        ui.add(__egui_github_link_file!());
+        ui.add(crate::__egui_github_link_file!());
     }
 }

egui/src/demos/toggle_switch.rs → egui_demo_lib/src/toggle_switch.rs

@@ -1,6 +1,5 @@
 //! Source code example of how to create your own widget.
 //! This is meant to be read as a tutorial, hence the plethora of comments.
-use crate::*;
 
 /// iOS-style toggle switch:
 ///
@@ -10,7 +9,7 @@ use crate::*;
 ///    |       |.......|
 ///     \_______\_____/
 /// ```
-pub fn toggle(ui: &mut Ui, on: &mut bool) -> Response {
+pub fn toggle(ui: &mut egui::Ui, on: &mut bool) -> egui::Response {
     // Widget code can be broken up in four steps:
     //  1. Decide a size for the widget
     //  2. Allocate space for it
@@ -25,7 +24,7 @@ pub fn toggle(ui: &mut Ui, on: &mut bool) -> Response {
     // 2. Allocating space:
     // This is where we get a region of the screen assigned.
     // We also tell the Ui to sense clicks in the allocated region.
-    let response = ui.allocate_response(desired_size, Sense::click());
+    let response = ui.allocate_response(desired_size, egui::Sense::click());
 
     // 3. Interact: Time to check for clicks!.
     if response.clicked {
@@ -41,16 +40,16 @@ pub fn toggle(ui: &mut Ui, on: &mut bool) -> Response {
     // "how should something that is being interacted with be painted?".
     // This will, for instance, give us different colors when the widget is hovered or clicked.
     let visuals = ui.style().interact(&response);
-    let off_bg_fill = Rgba::new(0.0, 0.0, 0.0, 0.0);
-    let on_bg_fill = Rgba::new(0.0, 0.5, 0.25, 1.0);
-    let bg_fill = lerp(off_bg_fill..=on_bg_fill, how_on);
+    let off_bg_fill = egui::Rgba::new(0.0, 0.0, 0.0, 0.0);
+    let on_bg_fill = egui::Rgba::new(0.0, 0.5, 0.25, 1.0);
+    let bg_fill = egui::lerp(off_bg_fill..=on_bg_fill, how_on);
     // All coordinates are in absolute screen coordinates so we use `rect` to place the elements.
     let rect = response.rect;
     let radius = 0.5 * rect.height();
     ui.painter().rect(rect, radius, bg_fill, visuals.bg_stroke);
     // Paint the circle, animating it from left to right with `how_on`:
-    let circle_x = lerp((rect.left() + radius)..=(rect.right() - radius), how_on);
-    let center = pos2(circle_x, rect.center().y);
+    let circle_x = egui::lerp((rect.left() + radius)..=(rect.right() - radius), how_on);
+    let center = egui::pos2(circle_x, rect.center().y);
     ui.painter()
         .circle(center, 0.75 * radius, visuals.fg_fill, visuals.fg_stroke);
 
@@ -61,32 +60,32 @@ pub fn toggle(ui: &mut Ui, on: &mut bool) -> Response {
 
 /// Here is the same code again, but a bit more compact:
 #[allow(dead_code)]
-fn toggle_compact(ui: &mut Ui, on: &mut bool) -> Response {
+fn toggle_compact(ui: &mut egui::Ui, on: &mut bool) -> egui::Response {
     let desired_size = ui.style().spacing.interact_size;
-    let response = ui.allocate_response(desired_size, Sense::click());
+    let response = ui.allocate_response(desired_size, egui::Sense::click());
     *on ^= response.clicked; // toggle if clicked
 
     let how_on = ui.ctx().animate_bool(response.id, *on);
     let visuals = ui.style().interact(&response);
-    let off_bg_fill = Rgba::new(0.0, 0.0, 0.0, 0.0);
-    let on_bg_fill = Rgba::new(0.0, 0.5, 0.25, 1.0);
-    let bg_fill = lerp(off_bg_fill..=on_bg_fill, how_on);
+    let off_bg_fill = egui::Rgba::new(0.0, 0.0, 0.0, 0.0);
+    let on_bg_fill = egui::Rgba::new(0.0, 0.5, 0.25, 1.0);
+    let bg_fill = egui::lerp(off_bg_fill..=on_bg_fill, how_on);
     let rect = response.rect;
     let radius = 0.5 * rect.height();
     ui.painter().rect(rect, radius, bg_fill, visuals.bg_stroke);
-    let circle_x = lerp((rect.left() + radius)..=(rect.right() - radius), how_on);
-    let center = pos2(circle_x, rect.center().y);
+    let circle_x = egui::lerp((rect.left() + radius)..=(rect.right() - radius), how_on);
+    let center = egui::pos2(circle_x, rect.center().y);
     ui.painter()
         .circle(center, 0.75 * radius, visuals.fg_fill, visuals.fg_stroke);
 
     response
 }
 
-pub fn demo(ui: &mut Ui, on: &mut bool) {
-    ui.horizontal_wrapped_for_text(TextStyle::Button, |ui| {
+pub fn demo(ui: &mut egui::Ui, on: &mut bool) {
+    ui.horizontal_wrapped_for_text(egui::TextStyle::Button, |ui| {
         ui.label("It's easy to create your own widgets!");
         ui.label("This toggle switch is just one function and 15 lines of code:");
         toggle(ui, on).on_hover_text("Click to toggle");
-        ui.add(__egui_github_link_file!());
+        ui.add(crate::__egui_github_link_file!());
     });
 }

egui/src/demos/widgets.rs → egui_demo_lib/src/widgets.rs

@@ -1,4 +1,4 @@
-use crate::{color::*, demos::Sliders, *};
+use egui::{color::*, *};
 
 #[derive(Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
@@ -20,7 +20,7 @@ pub struct Widgets {
     button_enabled: bool,
     count: usize,
     radio: Enum,
-    sliders: Sliders,
+    sliders: crate::Sliders,
     angle: f32,
     color: Srgba,
     single_line_text_input: String,
@@ -46,7 +46,7 @@ impl Default for Widgets {
 
 impl Widgets {
     pub fn ui(&mut self, ui: &mut Ui) {
-        ui.add(__egui_github_link_file_line!());
+        ui.add(crate::__egui_github_link_file_line!());
 
         ui.horizontal_wrapped_for_text(TextStyle::Body, |ui| {
             ui.add(Label::new("Text can have").text_color(srgba(110, 255, 110, 255)));
@@ -83,7 +83,7 @@ impl Widgets {
             ui.radio_value(&mut self.radio, Enum::Third, "Third");
         });
 
-        combo_box_with_label(ui, "Combo Box", format!("{:?}", self.radio), |ui| {
+        egui::combo_box_with_label(ui, "Combo Box", format!("{:?}", self.radio), |ui| {
             ui.selectable_value(&mut self.radio, Enum::First, "First");
             ui.selectable_value(&mut self.radio, Enum::Second, "Second");
             ui.selectable_value(&mut self.radio, Enum::Third, "Third");
@@ -110,12 +110,12 @@ impl Widgets {
             });
 
             ui.add(
-                Slider::f64(&mut self.sliders.value, 1.0..=100.0)
+                egui::Slider::f64(&mut self.sliders.value, 1.0..=100.0)
                     .logarithmic(true)
                     .text("A slider"),
             );
 
-            CollapsingHeader::new("More sliders")
+            egui::CollapsingHeader::new("More sliders")
                 .default_open(false)
                 .show(ui, |ui| {
                     self.sliders.ui(ui);
@@ -136,7 +136,7 @@ impl Widgets {
         ui.separator();
 
         ui.horizontal(|ui| {
-            ui.add(Label::new("Click to select a different text color: ").text_color(self.color));
+            ui.colored_label(self.color, "Click to select a different text color: ");
             ui.color_edit_button_srgba(&mut self.color);
         });
 
@@ -154,6 +154,6 @@ impl Widgets {
         ui.text_edit_multiline(&mut self.multiline_text_input);
 
         ui.separator();
-        super::toggle_switch::demo(ui, &mut self.toggle_switch);
+        crate::toggle_switch::demo(ui, &mut self.toggle_switch);
     }
 }