Add an about page that calls out gtk-rs and the GUI development book

fitnesstrax/app/resources/style.css

@@ -75,3 +75,11 @@
     padding: 8px;
     margin: 8px;
 }
+
+.about__content {
+    padding: 32px;
+}
+
+.about label {
+    margin-bottom: 16px;
+}

fitnesstrax/app/src/about.rs

@@ -0,0 +1,80 @@
+/*
+Copyright 2023 - 2024, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of FitnessTrax.
+
+FitnessTrax is free software: you can redistribute it and/or modify it under the terms of the GNU
+General Public License as published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+FitnessTrax is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with FitnessTrax. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+use glib::Object;
+use gtk::{prelude::*, subclass::prelude::*};
+
+#[derive(Default)]
+pub struct AboutWindowPrivate {}
+
+#[glib::object_subclass]
+impl ObjectSubclass for AboutWindowPrivate {
+    const NAME: &'static str = "AboutWindow";
+    type Type = AboutWindow;
+    type ParentType = gtk::Window;
+}
+
+impl ObjectImpl for AboutWindowPrivate {}
+impl WidgetImpl for AboutWindowPrivate {}
+impl WindowImpl for AboutWindowPrivate {}
+
+glib::wrapper! {
+    pub struct AboutWindow(ObjectSubclass<AboutWindowPrivate>) @extends gtk::Window, gtk::Widget;
+}
+
+impl Default for AboutWindow {
+    fn default() -> Self {
+        let s: Self = Object::builder().build();
+        s.set_width_request(600);
+        s.set_height_request(700);
+        s.add_css_class("about");
+
+        s.set_title(Some("About Fitnesstrax"));
+        let copyright = gtk::Label::builder()
+            .label("Copyright 2023-2024, Savanni D'Gerinel <savanni@luminescent-dreams.com>")
+            .halign(gtk::Align::Start)
+            .build();
+
+        let gtk_rs_thanks = gtk::Label::builder()
+            .label("I owe a huge debt of gratitude to the GTK-RS project (https://gtk-rs.org/), which makes it possible for me to write this application to begin with. Further, I owe a particular debt to Julian Hofer and his book, GUI development with Rust and GTK 4 (https://gtk-rs.org/gtk4-rs/stable/latest/book/). Without this book, I would have continued to stumble around writing bad user interfaces with even worse code.")
+            .halign(gtk::Align::Start).wrap(true)
+            .build();
+
+        let dependencies = gtk::Label::builder()
+            .label("This application depends on many libraries, most of which are licensed under the BSD-3 or GPL-3 licenses.")
+            .halign(gtk::Align::Start).wrap(true)
+            .build();
+
+        let content = gtk::Box::builder()
+            .orientation(gtk::Orientation::Vertical)
+            .css_classes(["about__content"])
+            .build();
+        content.append(&copyright);
+        content.append(&gtk_rs_thanks);
+        content.append(&dependencies);
+
+        let scroller = gtk::ScrolledWindow::builder()
+            .child(&content)
+            .hexpand(true)
+            .vexpand(true)
+            .hscrollbar_policy(gtk::PolicyType::Never)
+            .build();
+
+        s.set_child(Some(&scroller));
+
+        s
+    }
+}

fitnesstrax/app/src/app_window.rs

@@ -89,6 +89,7 @@ impl AppWindow {
         let header_bar = adw::HeaderBar::new();
 
         let main_menu = gio::Menu::new();
+        main_menu.append(Some("About"), Some("app.about"));
         main_menu.append(Some("Quit"), Some("app.quit"));
         let main_menu_button = gtk::MenuButton::builder()
             .icon_name("open-menu")

fitnesstrax/app/src/main.rs

@@ -1,5 +1,5 @@
 /*
-Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+Copyright 2023 - 2024, Savanni D'Gerinel <savanni@luminescent-dreams.com>
 
 This file is part of FitnessTrax.
 
@@ -14,6 +14,7 @@ General Public License for more details.
 You should have received a copy of the GNU General Public License along with FitnessTrax. If not, see <https://www.gnu.org/licenses/>.
 */
 
+mod about;
 mod app;
 mod app_window;
 mod components;
@@ -33,6 +34,15 @@ const APP_ID_PROD: &str = "com.luminescent-dreams.fitnesstrax";
 
 const RESOURCE_BASE_PATH: &str = "/com/luminescent-dreams/fitnesstrax/";
 
+fn setup_app_about_action(app: &adw::Application) {
+    let action = ActionEntry::builder("about")
+        .activate(|app: &adw::Application, _, _| {
+            let window = about::AboutWindow::default();
+            window.present();
+        }).build();
+    app.add_action_entries([action]);
+}
+
 /// Sets up an application-global action, `app.quit`, which will terminate the application.
 fn setup_app_close_action(app: &adw::Application) {
     let action = ActionEntry::builder("quit")
@@ -80,6 +90,7 @@ fn main() {
         let icon_theme = gtk::IconTheme::for_display(&gdk::Display::default().unwrap());
         icon_theme.add_resource_path(&(RESOURCE_BASE_PATH.to_owned() + "/icons/scalable/actions"));
 
+        setup_app_about_action(adw_app);
         setup_app_close_action(adw_app);
 
         AppWindow::new(app_id, RESOURCE_BASE_PATH, adw_app, ft_app.clone());