Save fullscreen state using glib settings

de.frajul.music-reader.gschema.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- GTK settings schema / configuration. Deploy this e.g. to $HOME/.local/share/glib-2.0/schemas -->
+<schemalist>
+  <schema id="de.frajul.music-reader" path="/de/frajul/music-reader/">
+    <key name="fullscreen" type="b">
+      <default>false</default>
+      <summary>Whether the application is in fullscreen mode</summary>
+    </key>
+  </schema>
+</schemalist>

flake.nix

@@ -42,6 +42,10 @@
 
             mkdir -p $out/share/icons
             cp ${./music-reader.png} $out/share/icons/music-reader.png
+
+            mkdir -p $out/share/glib-2.0/schemas
+            cp ${./de.frajul.music-reader.gschema.xml} $out/share/glib-2.0/schemas/de.frajul.music-reader.gschema.xml
+            glib-compile-schemas $out/share/glib-2.0/schemas/
           '';
         };
         devShell =

src/main.rs

@@ -5,9 +5,9 @@ mod ui;
 
 use clap::Parser;
 use env_logger::Env;
+use gio::Settings;
 use gtk::prelude::*;
 use gtk::Application;
-use log::debug;
 use std::cell::RefCell;
 use std::path::PathBuf;
 use std::rc::Rc;
@@ -27,7 +27,8 @@ fn main() {
     let app = Application::builder().application_id(APP_ID).build();
 
     app.connect_activate(move |app| {
-        let ui = build_ui(app);
+        let settings = Settings::new(APP_ID);
+        let ui = build_ui(app, settings);
         if let Some(file) = cli.file.as_ref() {
             ui::load_document(file, Rc::clone(&ui), 0);
         }
@@ -36,6 +37,6 @@ fn main() {
     app.run_with_args(&[] as &[&str]);
 }
 
-fn build_ui(app: &Application) -> Rc<RefCell<Ui>> {
-    Ui::build(app)
+fn build_ui(app: &Application, settings: Settings) -> Rc<RefCell<Ui>> {
+    Ui::build(app, settings)
 }

src/ui.rs

@@ -5,6 +5,7 @@ use std::{
     time::{Duration, Instant},
 };
 
+use gio::Settings;
 use gtk::{
     glib, Application, ApplicationWindow, Box, Button, FileChooserAction, FileChooserDialog,
     HeaderBar, Label, Overlay, Picture, ResponseType, ToggleButton,
@@ -19,6 +20,7 @@ use glib::clone;
 use gtk::prelude::*;
 
 pub struct Ui {
+    settings: Settings,
     window: ApplicationWindow,
     bottom_bar: gtk::Box,
     header_bar: gtk::HeaderBar,
@@ -114,22 +116,24 @@ impl DocumentCanvas {
     }
 }
 
-pub fn toggle_fullscreen(ui: &Ui) {
-    match !ui.window.is_fullscreen() {
+pub fn set_fullscreen(ui: &Ui, fullscreen: bool) {
+    match fullscreen {
         true => {
             ui.header_bar.hide();
             ui.bottom_bar.hide();
             ui.window.fullscreen();
 
             let new_area_height = ui.image_container.height() + ui.header_bar.height();
-            ui.document_canvas
-                .as_ref()
-                .unwrap()
-                .priority_cache_current_pages(new_area_height);
-            ui.document_canvas
-                .as_ref()
-                .unwrap()
-                .cache_surrounding_pages(new_area_height);
+            if ui.document_canvas.is_some() {
+                ui.document_canvas
+                    .as_ref()
+                    .unwrap()
+                    .priority_cache_current_pages(new_area_height);
+                ui.document_canvas
+                    .as_ref()
+                    .unwrap()
+                    .cache_surrounding_pages(new_area_height);
+            }
         }
         false => {
             ui.header_bar.show();
@@ -137,6 +141,11 @@ pub fn toggle_fullscreen(ui: &Ui) {
             ui.window.unfullscreen();
         }
     }
+    ui.settings.set_boolean("fullscreen", fullscreen).unwrap();
+}
+
+pub fn toggle_fullscreen(ui: &Ui) {
+    set_fullscreen(ui, !ui.window.is_fullscreen());
 }
 
 fn update_page_status(ui: &Ui) {
@@ -213,7 +222,7 @@ fn process_left_click(ui: &mut Ui, x: f64, y: f64) {
 }
 
 impl Ui {
-    pub fn build(app: &Application) -> Rc<RefCell<Ui>> {
+    pub fn build(app: &Application, settings: Settings) -> Rc<RefCell<Ui>> {
         debug!("building ui");
         let open_file_button = Button::from_icon_name("document-open");
         let fullscreen_button = Button::from_icon_name("view-fullscreen");
@@ -284,6 +293,7 @@ impl Ui {
         window.present();
 
         let ui = Ui {
+            settings,
             window,
             app_wrapper,
             bottom_bar: Box::builder()
@@ -351,6 +361,11 @@ impl Ui {
         );
 
         ui.borrow().window.present();
+
+        if ui.borrow().settings.boolean("fullscreen") {
+            set_fullscreen(&ui.borrow(), true);
+        }
+
         ui
     }
 }