Move all crates into a crates directory (#1940)

crates/egui_demo_lib/src/demo/code_editor.rs

@@ -0,0 +1,97 @@
+// ----------------------------------------------------------------------------
+
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "serde", serde(default))]
+pub struct CodeEditor {
+    language: String,
+    code: String,
+}
+
+impl Default for CodeEditor {
+    fn default() -> Self {
+        Self {
+            language: "rs".into(),
+            code: "// A very simple example\n\
+fn main() {\n\
+\tprintln!(\"Hello world!\");\n\
+}\n\
+"
+            .into(),
+        }
+    }
+}
+
+impl super::Demo for CodeEditor {
+    fn name(&self) -> &'static str {
+        "🖮 Code Editor"
+    }
+
+    fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
+        use super::View as _;
+        egui::Window::new(self.name())
+            .open(open)
+            .default_height(500.0)
+            .show(ctx, |ui| self.ui(ui));
+    }
+}
+
+impl super::View for CodeEditor {
+    fn ui(&mut self, ui: &mut egui::Ui) {
+        let Self { language, code } = self;
+
+        ui.horizontal(|ui| {
+            ui.set_height(0.0);
+            ui.label("An example of syntax highlighting in a TextEdit.");
+            ui.add(crate::egui_github_link_file!());
+        });
+
+        if cfg!(feature = "syntect") {
+            ui.horizontal(|ui| {
+                ui.label("Language:");
+                ui.text_edit_singleline(language);
+            });
+            ui.horizontal_wrapped(|ui| {
+                ui.spacing_mut().item_spacing.x = 0.0;
+                ui.label("Syntax highlighting powered by ");
+                ui.hyperlink_to("syntect", "https://github.com/trishume/syntect");
+                ui.label(".");
+            });
+        } else {
+            ui.horizontal_wrapped(|ui| {
+                ui.spacing_mut().item_spacing.x = 0.0;
+                ui.label("Compile the demo with the ");
+                ui.code("syntax_highlighting");
+                ui.label(" feature to enable more accurate syntax highlighting using ");
+                ui.hyperlink_to("syntect", "https://github.com/trishume/syntect");
+                ui.label(".");
+            });
+        }
+
+        let mut theme = crate::syntax_highlighting::CodeTheme::from_memory(ui.ctx());
+        ui.collapsing("Theme", |ui| {
+            ui.group(|ui| {
+                theme.ui(ui);
+                theme.clone().store_in_memory(ui.ctx());
+            });
+        });
+
+        let mut layouter = |ui: &egui::Ui, string: &str, wrap_width: f32| {
+            let mut layout_job =
+                crate::syntax_highlighting::highlight(ui.ctx(), &theme, string, language);
+            layout_job.wrap.max_width = wrap_width;
+            ui.fonts().layout_job(layout_job)
+        };
+
+        egui::ScrollArea::vertical().show(ui, |ui| {
+            ui.add(
+                egui::TextEdit::multiline(code)
+                    .font(egui::TextStyle::Monospace) // for cursor height
+                    .code_editor()
+                    .desired_rows(10)
+                    .lock_focus(true)
+                    .desired_width(f32::INFINITY)
+                    .layouter(&mut layouter),
+            );
+        });
+    }
+}