unshell/unshell-gui/src/app.rs

use crate::flowchart::FlowChart;

/// We derive Deserialize/Serialize so we can persist app state on shutdown.
#[derive(serde::Deserialize, serde::Serialize)]
#[serde(default)] // if we add new fields, give them default values when deserializing old state
pub struct TemplateApp {
    tab: Tab,

    #[serde(skip)]
    flowchart: FlowChart,
}

#[derive(serde::Deserialize, serde::Serialize)]
pub enum Tab {
    Flowchart,
    Test,
}

impl Default for TemplateApp {
    fn default() -> Self {
        Self {
            tab: Tab::Flowchart,
            // Example stuff:
            // label: "Hello World!".to_owned(),
            // value: 2.7,
            flowchart: FlowChart::new(),
        }
    }
}

impl TemplateApp {
    /// Called once before the first frame.
    pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
        // This is also where you can customize the look and feel of egui using
        // `cc.egui_ctx.set_visuals` and `cc.egui_ctx.set_fonts`.

        // Load previous app state (if any).
        // Note that you must enable the `persistence` feature for this to work.
        if let Some(storage) = cc.storage {
            eframe::get_value(storage, eframe::APP_KEY).unwrap_or_default()
        } else {
            Default::default()
        }
    }
}

impl eframe::App for TemplateApp {
    /// Called by the framework to save state before shutdown.
    fn save(&mut self, storage: &mut dyn eframe::Storage) {
        eframe::set_value(storage, eframe::APP_KEY, self);
    }

    /// Called each time the UI needs repainting, which may be many times per second.
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        // Put your widgets into a `SidePanel`, `TopBottomPanel`, `CentralPanel`, `Window` or `Area`.
        // For inspiration and more examples, go to https://emilk.github.io/egui

        egui::TopBottomPanel::top("tab_panel").show(ctx, |ui| {
            // The top panel is often a good place for a menu bar:

            egui::MenuBar::new()
                // .style(StyleModifier::new(|s| s.visuals))
                .ui(ui, |ui| {
                    if ui
                        .menu_button("Network", |ui| if ui.button("Quit").clicked() {})
                        .response
                        .clicked()
                    {
                        self.tab = Tab::Flowchart;
                    };

                    if ui
                        .menu_button("Test", |ui| if ui.button("Quit").clicked() {})
                        .response
                        .clicked()
                    {
                        self.tab = Tab::Test;
                    };

                    ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
                        egui::widgets::global_theme_preference_switch(ui);
                    });
                });
        });

        egui::TopBottomPanel::bottom("tab_panel").show(ctx, |ui| {
            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
                ui.label(format!("UnShell UI {}", env!("CARGO_PKG_VERSION")));
                egui::warn_if_debug_build(ui);
            });
        });

        // egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
        //     // The top panel is often a good place for a menu bar:

        //     egui::MenuBar::new().ui(ui, |ui| {
        //         if ui
        //             .menu_button("Network", |ui| if ui.button("Quit").clicked() {})
        //             .response
        //             .clicked()
        //         {
        //             self.tab = Tab::Flowchart;
        //         };

        //         if ui
        //             .menu_button("Test", |ui| if ui.button("Quit").clicked() {})
        //             .response
        //             .clicked()
        //         {
        //             self.tab = Tab::Test;
        //         };
        //     });
        // });

        egui::CentralPanel::default().show(ctx, |ui| {
            match self.tab {
                Tab::Flowchart => {
                    self.flowchart.paint(ui);
                }
                Tab::Test => {
                    // The central panel the region left after adding TopPanel's and SidePanel's
                    ui.heading("eframe template");

                    ui.horizontal(|ui| {
                        ui.label("Write something: ");
                        // ui.text_edit_singleline(&mut self.label);
                    });

                    // ui.add(egui::Slider::new(&mut self.value, 0.0..=10.0).text("value"));
                    // if ui.button("Increment").clicked() {
                    //     self.value += 1.0;
                    // }

                    ui.separator();

                    ui.add(egui::github_link_file!(
                        "https://github.com/emilk/eframe_template/blob/main/",
                        "Source code."
                    ));
                }
            }
        });
    }
}