94 lines
3.2 KiB
Rust
94 lines
3.2 KiB
Rust
#[derive(Default)]
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#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
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#[cfg_attr(feature = "serde", serde(default))]
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pub struct About {}
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impl super::Demo for About {
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fn name(&self) -> &'static str {
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"About egui"
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}
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fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
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egui::Window::new(self.name())
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.default_width(320.0)
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.open(open)
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.show(ctx, |ui| {
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use super::View as _;
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self.ui(ui);
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});
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}
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}
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impl super::View for About {
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fn ui(&mut self, ui: &mut egui::Ui) {
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use egui::special_emojis::{OS_APPLE, OS_LINUX, OS_WINDOWS};
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ui.heading("egui");
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ui.label(format!(
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"egui is an immediate mode GUI library written in Rust. egui runs both on the web and natively on {}{}{}. \
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On the web it is compiled to WebAssembly and rendered with WebGL.{}",
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OS_APPLE, OS_LINUX, OS_WINDOWS,
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if cfg!(target_arch = "wasm32") {
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" Everything you see is rendered as textured triangles. There is no DOM, HTML, JS or CSS. Just Rust."
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} else {""}
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));
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ui.label("egui is designed to be easy to use, portable, and fast.");
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ui.add_space(12.0); // ui.separator();
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ui.heading("Immediate mode");
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about_immediate_mode(ui);
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ui.add_space(12.0); // ui.separator();
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ui.heading("Links");
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links(ui);
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}
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}
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fn about_immediate_mode(ui: &mut egui::Ui) {
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ui.style_mut().spacing.interact_size.y = 0.0; // hack to make `horizontal_wrapped` work better with text.
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ui.horizontal_wrapped(|ui| {
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ui.spacing_mut().item_spacing.x = 0.0;
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ui.label("Immediate mode is a GUI paradigm that lets you create a GUI with less code and simpler control flow. For example, this is how you create a ");
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let _ = ui.small_button("button");
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ui.label(" in egui:");
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});
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ui.add_space(8.0);
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crate::rust_view_ui(
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ui,
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r#"
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if ui.button("Save").clicked() {
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my_state.save();
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}"#
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.trim_start_matches('\n'),
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);
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ui.add_space(8.0);
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ui.label("Note how there are no callbacks or messages, and no button state to store.");
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ui.label("Immediate mode has its roots in gaming, where everything on the screen is painted at the display refresh rate, i.e. at 60+ frames per second. \
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In immediate mode GUIs, the entire interface is laid out and painted at the same high rate. \
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This makes immediate mode GUIs especially well suited for highly interactive applications.");
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ui.horizontal_wrapped(|ui| {
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ui.spacing_mut().item_spacing.x = 0.0;
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ui.label("More about immediate mode ");
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ui.hyperlink_to("here", "https://github.com/emilk/egui#why-immediate-mode");
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ui.label(".");
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});
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}
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fn links(ui: &mut egui::Ui) {
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use egui::special_emojis::{GITHUB, TWITTER};
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ui.hyperlink_to(
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format!("{GITHUB} egui on GitHub"),
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"https://github.com/emilk/egui",
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);
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ui.hyperlink_to(
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format!("{TWITTER} @ernerfeldt"),
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"https://twitter.com/ernerfeldt",
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);
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ui.hyperlink_to("egui documentation", "https://docs.rs/egui/");
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}
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