Add a view which would be displayed when there is no database

fitnesstrax/app/src/main.rs

@@ -1,5 +1,7 @@
+use adw::prelude::*;
 use gio::resources_lookup_data;
-use gtk::{prelude::*, STYLE_PROVIDER_PRIORITY_USER};
+use glib::Object;
+use gtk::{prelude::*, subclass::prelude::*, STYLE_PROVIDER_PRIORITY_USER};
 use std::env;
 
 const APP_ID_DEV: &str = "com.luminescent-dreams.fitnesstrax.dev";
@@ -9,8 +11,101 @@ const RESOURCE_BASE_PATH: &str = "/com/luminescent-dreams/fitnesstrax/";
 
 struct AppState {}
 
+pub struct NoDatabaseViewPrivate {}
+
+#[glib::object_subclass]
+impl ObjectSubclass for NoDatabaseViewPrivate {
+    const NAME: &'static str = "NoDatabaseView";
+    type Type = NoDatabaseView;
+    type ParentType = gtk::Box;
+
+    fn new() -> Self {
+        Self {}
+    }
+}
+
+impl ObjectImpl for NoDatabaseViewPrivate {}
+impl WidgetImpl for NoDatabaseViewPrivate {}
+impl BoxImpl for NoDatabaseViewPrivate {}
+
+glib::wrapper! {
+    pub struct NoDatabaseView(ObjectSubclass<NoDatabaseViewPrivate>) @extends gtk::Box, gtk::Widget;
+}
+
+impl NoDatabaseView {
+    pub fn new() -> Self {
+        let s: Self = Object::builder().build();
+
+        let label = gtk::Label::builder()
+            .label("Database is not configured.")
+            .build();
+        s.append(&label);
+        s
+    }
+}
+
+// window setup...
+// main window with all of its layout
+// modals that overlay atop the main window and capture focus
+// menus
+// There is more than one view for the main window. There's the view for data entry, then another
+// view for showing graphs. Then a third view, or maybe a modal, for editing a day.
+//
+// So, the ordinary data view is the history the metrics, and the calendar. Scrollable, and items
+// within the scrolling area can be clicked upon in order to open the edit.
+//
+// I don't need to model the whole thing at once. The graphs will be some time out, and so I can
+// model just the main view, which consists of metrics, the data, and the calendar. Day entries
+// should be summaries of the day, expandable to the details.
+//
+// Then there is the view which notifies the user that the database has not been configured.
+
+enum MainView {
+    NoDatabase(NoDatabaseView),
+}
+
 struct AppWindow {
     window: adw::ApplicationWindow,
+    current_view: MainView,
+}
+
+impl AppWindow {
+    fn new(app: &adw::Application) -> AppWindow {
+        let stylesheet = String::from_utf8(
+            resources_lookup_data(
+                &format!("{}style.css", RESOURCE_BASE_PATH),
+                gio::ResourceLookupFlags::NONE,
+            )
+            .expect("stylesheet must be available in the resources")
+            .to_vec(),
+        )
+        .expect("to parse stylesheet");
+
+        let provider = gtk::CssProvider::new();
+        provider.load_from_data(&stylesheet);
+
+        let window = adw::ApplicationWindow::builder()
+            .application(app)
+            .width_request(800)
+            .height_request(600)
+            .build();
+
+        let context = window.style_context();
+        context.add_provider(&provider, STYLE_PROVIDER_PRIORITY_USER);
+
+        window.present();
+
+        let current_view = {
+            let view = NoDatabaseView::new();
+            window.set_content(Some(&view));
+            MainView::NoDatabase(view)
+        };
+
+        Self {
+            window,
+            current_view,
+        }
+    }
 }
 
 fn main() {
@@ -49,24 +144,7 @@ fn main() {
         .build();
 
     app.connect_activate(move |app| {
-        let stylesheet = String::from_utf8(
-            resources_lookup_data(
-                &format!("{}style.css", RESOURCE_BASE_PATH),
-                gio::ResourceLookupFlags::NONE,
-            )
-            .expect("stylesheet must be available in the resources")
-            .to_vec(),
-        )
-        .expect("to parse stylesheet");
-
-        let provider = gtk::CssProvider::new();
-        provider.load_from_data(&stylesheet);
-
-        let window = adw::ApplicationWindow::new(app);
-        let context = window.style_context();
-        context.add_provider(&provider, STYLE_PROVIDER_PRIORITY_USER);
-
-        window.present();
+        AppWindow::new(app);
     });
 
     let args: Vec<String> = env::args().collect();