player bar: hook up controls

data/ui/player_bar.blp

@@ -36,6 +36,7 @@ template $MusicusPlayerBar : Gtk.Box {
       styles ["circular", "flat"]
       valign: center;
       icon-name: "media-skip-backward-symbolic";
+      clicked => $previous() swapped;
     }
 
     Gtk.ToggleButton playlist_button {
@@ -49,6 +50,7 @@ template $MusicusPlayerBar : Gtk.Box {
       styles ["circular", "flat"]
       valign: center;
       icon-name: "media-skip-forward-symbolic";
+      clicked => $next() swapped;
     }
   }
 

src/player.rs

@@ -16,6 +16,12 @@ mod imp {
         pub playlist: OnceCell<gio::ListStore>,
         #[property(get, set = Self::set_current_index)]
         pub current_index: Cell<u32>,
+        #[property(get, set)]
+        pub current_time: Cell<u32>,
+        #[property(get, set)]
+        pub remaining_time: Cell<u32>,
+        #[property(get, set = Self::set_position)]
+        pub position: Cell<f64>,
     }
 
     impl MusicusPlayer {
@@ -36,6 +42,10 @@ mod imp {
                     .set_is_playing(true);
             }
         }
+
+        pub fn set_position(&self, position: f64) {
+            self.position.set(position);
+        }
     }
 
     #[glib::object_subclass]
@@ -59,6 +69,9 @@ impl MusicusPlayer {
             .property("playing", false)
             .property("playlist", gio::ListStore::new::<PlaylistItem>())
             .property("current-index", 0u32)
+            .property("current-time", 0u32)
+            .property("remaining-time", 10000u32)
+            .property("position", 0.0)
             .build()
     }
 
@@ -88,6 +101,18 @@ impl MusicusPlayer {
             .item(imp.current_index.get())
             .and_downcast::<PlaylistItem>()
     }
+
+    pub fn next(&self) {
+        if self.current_index() < self.playlist().n_items() - 1 {
+            self.set_current_index(self.current_index() + 1);
+        }
+    }
+
+    pub fn previous(&self) {
+        if self.current_index() > 0 {
+            self.set_current_index(self.current_index() - 1);
+        }
+    }
 }
 
 impl Default for MusicusPlayer {

src/player_bar.rs

@@ -1,6 +1,6 @@
 use crate::player::MusicusPlayer;
 use gtk::{
-    glib::{self, subclass::Signal, Properties},
+    glib::{self, clone, subclass::Signal, Properties},
     prelude::*,
     subclass::prelude::*,
 };
@@ -37,6 +37,28 @@ mod imp {
         pub remaining_time_label: TemplateChild<gtk::Label>,
     }
 
+    impl PlayerBar {
+        fn update(&self) {
+            if let Some(item) = self.player.borrow().current_item() {
+                let mut title = item.title();
+
+                if let Some(part_title) = item.part_title() {
+                    title.push_str(": ");
+                    title.push_str(&part_title);
+                }
+
+                self.title_label.set_label(&title);
+
+                if let Some(performances) = item.performers() {
+                    self.subtitle_label.set_label(&performances);
+                    self.subtitle_label.set_visible(true);
+                } else {
+                    self.subtitle_label.set_visible(false);
+                }
+            }
+        }
+    }
+
     #[glib::object_subclass]
     impl ObjectSubclass for PlayerBar {
         const NAME: &'static str = "MusicusPlayerBar";
@@ -82,27 +104,30 @@ mod imp {
                 .sync_create()
                 .build();
 
-            let title_label = self.title_label.get();
-            let subtitle_label = self.subtitle_label.get();
-            player.connect_current_index_notify(move |player| {
-                if let Some(item) = player.current_item() {
-                    let mut title = item.title();
+            let obj = self.obj().clone();
 
-                    if let Some(part_title) = item.part_title() {
-                        title.push_str(": ");
-                        title.push_str(&part_title);
-                    }
+            player.connect_current_index_notify(clone!(@weak obj => move |_| obj.imp().update()));
+            player
+                .playlist()
+                .connect_items_changed(clone!(@weak obj => move |_, _, _, _| obj.imp().update()));
 
-                    title_label.set_label(&title);
+            player
+                .bind_property("current-time", &self.current_time_label.get(), "label")
+                .transform_to(|_, t: u32| Some(format!("{:0>2}:{:0>2}", t / 60, t % 60)))
+                .sync_create()
+                .build();
 
-                    if let Some(performances) = item.performers() {
-                        subtitle_label.set_label(&performances);
-                        subtitle_label.set_visible(true);
-                    } else {
-                        subtitle_label.set_visible(false);
-                    }
-                }
-            });
+            player
+                .bind_property("remaining-time", &self.remaining_time_label.get(), "label")
+                .transform_to(|_, t: u32| Some(format!("{:0>2}:{:0>2}", t / 60, t % 60)))
+                .sync_create()
+                .build();
+
+            player
+                .bind_property("position", &self.slider.adjustment(), "value")
+                .sync_create()
+                .bidirectional()
+                .build();
         }
     }
 
@@ -137,11 +162,21 @@ impl PlayerBar {
         self.imp().playlist_button.set_active(false);
     }
 
+    #[template_callback]
+    fn previous(&self, _: &gtk::Button) {
+        self.player().previous();
+    }
+
     #[template_callback]
     fn show_playlist(&self, button: &gtk::ToggleButton) {
         self.emit_by_name::<()>("show-playlist", &[&button.is_active()]);
     }
 
+    #[template_callback]
+    fn next(&self, _: &gtk::Button) {
+        self.player().next();
+    }
+
     #[template_callback]
     fn play_pause(&self, _: &gtk::Button) {
         let player = self.player();