Add a common editor widget

src/widgets/editor.rs

@@ -0,0 +1,85 @@
+use gio::prelude::*;
+use glib::clone;
+use gtk::prelude::*;
+use gtk_macros::get_widget;
+
+/// Common UI elements for an editor.
+pub struct Editor {
+    /// The actual GTK widget.
+    pub widget: gtk::Stack,
+
+    /// The button to switch to the previous screen.
+    back_button: gtk::Button,
+
+    /// The title widget within the header bar.
+    window_title: libadwaita::WindowTitle,
+
+    /// The button to save the edited item.
+    save_button: gtk::Button,
+
+    /// The box containing the content.
+    content_box: gtk::Box,
+
+    /// The status page for the error screen.
+    status_page: libadwaita::StatusPage,
+}
+
+impl Editor {
+    /// Create a new screen.
+    pub fn new() -> Self {
+        let builder = gtk::Builder::from_resource("/de/johrpan/musicus/ui/editor.ui");
+
+        get_widget!(builder, gtk::Stack, widget);
+        get_widget!(builder, gtk::Button, back_button);
+        get_widget!(builder, libadwaita::WindowTitle, window_title);
+        get_widget!(builder, gtk::Button, save_button);
+        get_widget!(builder, gtk::Box, content_box);
+        get_widget!(builder, libadwaita::StatusPage, status_page);
+        get_widget!(builder, gtk::Button, try_again_button);
+
+        try_again_button.connect_clicked(clone!(@strong widget => move |_| {
+            widget.set_visible_child_name("content");
+        }));
+
+        Self {
+            widget,
+            back_button,
+            window_title,
+            save_button,
+            content_box,
+            status_page,
+        }
+    }
+
+    /// Set a closure to be called when the back button is pressed.
+    pub fn set_back_cb<F: Fn() + 'static>(&self, cb: F) {
+        self.back_button.connect_clicked(move |_| cb());
+    }
+
+    /// Show a title in the header bar.
+    pub fn set_title(&self, title: &str) {
+        self.window_title.set_title(Some(title));
+    }
+
+    pub fn set_save_cb<F: Fn() + 'static>(&self, cb: F) {
+        self.save_button.connect_clicked(move |_| cb());
+    }
+
+    /// Show a loading page.
+    pub fn loading(&self) {
+        self.widget.set_visible_child_name("loading");
+    }
+
+    /// Show an error page. The page contains a button to get back to the
+    /// actual editor.
+    pub fn error(&self, title: &str, description: &str) {
+        self.status_page.set_title(Some(title));
+        self.status_page.set_description(Some(description));
+        self.widget.set_visible_child_name("error");
+    }
+
+    /// Add content to the bottom of the content area.
+    pub fn add_content<W: IsA<gtk::Widget>>(&self, content: &W) {
+        self.content_box.append(content);
+    }
+}