Move all crates into a crates directory (#1940)

crates/egui_demo_lib/src/demo/mod.rs

@@ -0,0 +1,52 @@
+//! Demo-code for showing how egui is used.
+//!
+//! The demo-code is also used in benchmarks and tests.
+
+// ----------------------------------------------------------------------------
+
+pub mod about;
+pub mod code_editor;
+pub mod code_example;
+pub mod context_menu;
+pub mod dancing_strings;
+pub mod demo_app_windows;
+pub mod drag_and_drop;
+pub mod font_book;
+pub mod layout_test;
+pub mod misc_demo_window;
+pub mod multi_touch;
+pub mod paint_bezier;
+pub mod painting;
+pub mod password;
+pub mod plot_demo;
+pub mod scrolling;
+pub mod sliders;
+pub mod strip_demo;
+pub mod table_demo;
+pub mod tests;
+pub mod text_edit;
+pub mod toggle_switch;
+pub mod widget_gallery;
+pub mod window_options;
+pub mod window_with_panels;
+
+pub use {
+    about::About, demo_app_windows::DemoWindows, misc_demo_window::MiscDemoWindow,
+    widget_gallery::WidgetGallery,
+};
+
+// ----------------------------------------------------------------------------
+
+/// Something to view in the demo windows
+pub trait View {
+    fn ui(&mut self, ui: &mut egui::Ui);
+}
+
+/// Something to view
+pub trait Demo {
+    /// `&'static` so we can also use it as a key to store open/close state.
+    fn name(&self) -> &'static str;
+
+    /// Show windows, etc
+    fn show(&mut self, ctx: &egui::Context, open: &mut bool);
+}