Add a font book to the demo app

egui/src/demos/demo_windows.rs

@@ -37,6 +37,7 @@ impl Default for Demos {
     fn default() -> Self {
         Self {
             demos: vec![
+                (false, Box::new(crate::demos::FontBook::default())),
                 (false, Box::new(crate::demos::DancingStrings::default())),
                 (false, Box::new(crate::demos::DragAndDropDemo::default())),
                 (false, Box::new(crate::demos::Tests::default())),

egui/src/demos/font_book.rs

@@ -0,0 +1,105 @@
+use crate::*;
+
+pub struct FontBook {
+    standard: bool,
+    emojis: bool,
+    filter: String,
+    text_style: TextStyle,
+}
+
+impl Default for FontBook {
+    fn default() -> Self {
+        Self {
+            standard: false,
+            emojis: true,
+            filter: Default::default(),
+            text_style: TextStyle::Heading,
+        }
+    }
+}
+
+impl FontBook {
+    fn characters_ui(&self, ui: &mut Ui, characters: &[(u32, char, &str)]) {
+        for &(_, chr, name) in characters {
+            if !self.filter.is_empty() && !name.contains(&self.filter) {
+                continue;
+            }
+
+            let button = Button::new(chr).text_style(self.text_style).frame(false);
+
+            let tooltip_ui = |ui: &mut Ui| {
+                ui.add(Label::new(chr).text_style(self.text_style));
+                ui.label(format!("{}\nU+{:X}\n\nClick to copy", name, chr as u32));
+            };
+
+            if ui.add(button).on_hover_ui(tooltip_ui).clicked {
+                ui.output().copied_text = chr.to_string();
+            }
+        }
+    }
+}
+
+impl demos::Demo for FontBook {
+    fn name(&self) -> &str {
+        "🔤 Font Book"
+    }
+
+    fn show(&mut self, ctx: &std::sync::Arc<crate::Context>, open: &mut bool) {
+        Window::new(self.name()).open(open).show(ctx, |ui| {
+            use demos::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;
+
+        ui.label(format!(
+            "Egui supports {} standard characters and {} emojis.\nClick on a character to copy it.",
+            UBUNTU_FONT_CHARACTERS.len(),
+            FULL_EMOJI_LIST.len(),
+        ));
+
+        ui.separator();
+
+        ui.horizontal(|ui| {
+            ui.label("Text style:");
+            for style in TextStyle::all() {
+                ui.radio_value(&mut self.text_style, style, format!("{:?}", style));
+            }
+        });
+
+        ui.horizontal(|ui| {
+            ui.label("Show:");
+            ui.checkbox(&mut self.standard, "Standard");
+            ui.checkbox(&mut self.emojis, "Emojis");
+        });
+
+        ui.horizontal(|ui| {
+            ui.label("Filter:");
+            ui.text_edit_singleline(&mut self.filter);
+            self.filter = self.filter.to_lowercase();
+            if ui.button("ｘ").clicked {
+                self.filter.clear();
+            }
+        });
+
+        ui.separator();
+
+        crate::ScrollArea::auto_sized().show(ui, |ui| {
+            ui.horizontal_wrapped(|ui| {
+                ui.style_mut().spacing.item_spacing = Vec2::splat(2.0);
+
+                if self.standard {
+                    self.characters_ui(ui, UBUNTU_FONT_CHARACTERS);
+                }
+                if self.emojis {
+                    self.characters_ui(ui, FULL_EMOJI_LIST);
+                }
+            });
+        });
+    }
+}

egui/src/demos/mod.rs

@@ -7,6 +7,9 @@ mod dancing_strings;
 pub mod demo_window;
 mod demo_windows;
 mod drag_and_drop;
+mod font_book;
+pub mod font_contents_emoji;
+pub mod font_contents_ubuntu;
 mod fractal_clock;
 mod sliders;
 mod tests;
@@ -15,8 +18,8 @@ mod widgets;
 
 pub use {
     app::*, color_test::ColorTest, dancing_strings::DancingStrings, demo_window::DemoWindow,
-    demo_windows::*, drag_and_drop::*, fractal_clock::FractalClock, sliders::Sliders, tests::Tests,
-    widgets::Widgets,
+    demo_windows::*, drag_and_drop::*, font_book::FontBook, fractal_clock::FractalClock,
+    sliders::Sliders, tests::Tests, widgets::Widgets,
 };
 
 pub const LOREM_IPSUM: &str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";