Turn view::port::Port into a gtk::Button subclass

src/view/graph_view.rs

@@ -137,7 +137,7 @@ mod imp {
             // For some reason, gtk4::WidgetExt::translate_coordinates gives me incorrect values,
             // so we manually calculate the needed offsets here.
 
-            let from_port = &nodes.get(&link.node_from)?.get_port(link.port_from)?.widget;
+            let from_port = &nodes.get(&link.node_from)?.get_port(link.port_from)?;
             let gtk::Allocation {
                 x: mut fx,
                 y: mut fy,
@@ -151,7 +151,7 @@ mod imp {
             fx += fnx + fw;
             fy += fny + (fh / 2);
 
-            let to_port = &nodes.get(&link.node_to)?.get_port(link.port_to)?.widget;
+            let to_port = &nodes.get(&link.node_to)?.get_port(link.port_to)?;
             let gtk::Allocation {
                 x: mut tx,
                 y: mut ty,

src/view/node.rs

@@ -108,21 +108,17 @@ impl Node {
     pub fn add_port(&mut self, id: u32, port: super::port::Port) {
         let private = imp::Node::from_instance(self);
 
-        match port.direction {
+        match port.direction() {
             Direction::Input => {
                 private
                     .grid
-                    .attach(&port.widget, 0, private.num_ports_in.get() as i32 + 1, 1, 1);
+                    .attach(&port, 0, private.num_ports_in.get() as i32 + 1, 1, 1);
                 private.num_ports_in.set(private.num_ports_in.get() + 1);
             }
             Direction::Output => {
-                private.grid.attach(
-                    &port.widget,
-                    1,
-                    private.num_ports_out.get() as i32 + 1,
-                    1,
-                    1,
-                );
+                private
+                    .grid
+                    .attach(&port, 1, private.num_ports_out.get() as i32 + 1, 1, 1);
                 private.num_ports_out.set(private.num_ports_out.get() + 1);
             }
         }
@@ -138,12 +134,12 @@ impl Node {
     pub fn remove_port(&self, id: u32) {
         let private = imp::Node::from_instance(self);
         if let Some(port) = private.ports.borrow_mut().remove(&id) {
-            match port.direction {
+            match port.direction() {
                 Direction::Input => private.num_ports_in.set(private.num_ports_in.get() - 1),
                 Direction::Output => private.num_ports_in.set(private.num_ports_out.get() - 1),
             }
 
-            port.widget.unparent();
+            port.unparent();
         }
     }
 }

src/view/port.rs

@@ -1,12 +1,34 @@
-use gtk::WidgetExt;
+use gtk::{glib, prelude::*, subclass::prelude::*};
 
 use crate::controller::MediaType;
 
-/// Graphical representation of a pipewire port.
-pub struct Port {
-    pub widget: gtk::Button,
-    pub id: u32,
-    pub direction: pipewire::port::Direction,
+mod imp {
+    use once_cell::unsync::OnceCell;
+
+    use super::*;
+
+    /// Graphical representation of a pipewire port.
+    #[derive(Default)]
+    pub struct Port {
+        pub(super) id: OnceCell<u32>,
+        pub(super) direction: OnceCell<pipewire::port::Direction>,
+    }
+
+    #[glib::object_subclass]
+    impl ObjectSubclass for Port {
+        const NAME: &'static str = "Port";
+        type Type = super::Port;
+        type ParentType = gtk::Button;
+    }
+
+    impl ObjectImpl for Port {}
+    impl WidgetImpl for Port {}
+    impl ButtonImpl for Port {}
+}
+
+glib::wrapper! {
+    pub struct Port(ObjectSubclass<imp::Port>)
+        @extends gtk::Button, gtk::Widget;
 }
 
 impl Port {
@@ -16,20 +38,30 @@ impl Port {
         direction: pipewire::port::Direction,
         media_type: Option<MediaType>,
     ) -> Self {
-        let widget = gtk::Button::with_label(name);
+        // Create the widget and initialize needed fields
+        let res: Self = glib::Object::new(&[]).expect("Failed to create Port");
+        let private = imp::Port::from_instance(&res);
+        private.id.set(id).expect("Port id already set");
+        private
+            .direction
+            .set(direction)
+            .expect("Port direction already set");
+
+        res.set_child(Some(&gtk::Label::new(Some(name))));
 
         // Color the port according to its media type.
         match media_type {
-            Some(MediaType::Video) => widget.add_css_class("video"),
-            Some(MediaType::Audio) => widget.add_css_class("audio"),
-            Some(MediaType::Midi) => widget.add_css_class("midi"),
+            Some(MediaType::Video) => res.add_css_class("video"),
+            Some(MediaType::Audio) => res.add_css_class("audio"),
+            Some(MediaType::Midi) => res.add_css_class("midi"),
             None => {}
         }
 
-        Self {
-            widget,
-            id,
-            direction,
+        res
     }
+
+    pub fn direction(&self) -> &pipewire::port::Direction {
+        let private = imp::Port::from_instance(self);
+        private.direction.get().expect("Port direction is not set")
     }
 }