graphview: code cleanup

Remove dead code
Rewrite error message
Use simplified anyhow result for xml
methods

src/graphmanager/graphview.rs

@@ -40,7 +40,7 @@ use gtk::{
 use log::{error, warn};
 
 use std::cell::RefMut;
-use std::{cmp::Ordering, collections::HashMap, error};
+use std::{cmp::Ordering, collections::HashMap};
 
 static GRAPHVIEW_STYLE: &str = include_str!("graphview.css");
 
@@ -771,7 +771,7 @@ impl GraphView {
         self.queue_draw();
     }
 
-    pub fn render_xml(&self, filename: &str) -> anyhow::Result<(), Box<dyn error::Error>> {
+    pub fn render_xml(&self, filename: &str) -> anyhow::Result<()> {
         let mut file = File::create(filename).unwrap();
         let mut writer = EmitterConfig::new()
             .perform_indent(true)
@@ -825,7 +825,7 @@ impl GraphView {
         Ok(())
     }
 
-    pub fn load_xml(&self, filename: &str) -> anyhow::Result<(), Box<dyn error::Error>> {
+    pub fn load_xml(&self, filename: &str) -> anyhow::Result<()> {
         let file = File::open(filename).unwrap();
         let file = BufReader::new(file);
 

src/graphmanager/node.rs

@@ -170,7 +170,7 @@ impl Node {
     pub fn new(id: u32, name: &str, node_type: NodeType) -> Self {
         let res: Self = glib::Object::new(&[]).expect("Failed to create Node");
         let private = imp::Node::from_instance(&res);
-        private.id.set(id).expect("Node id already set");
+        private.id.set(id).expect("Node id is already set");
         res.set_name(name);
         res.add_css_class("node");
         private
@@ -183,7 +183,6 @@ impl Node {
     fn set_name(&self, name: &str) {
         let self_ = imp::Node::from_instance(self);
         self_.name.set_text(name);
-        println!("{}", name);
     }
 
     fn set_description(&self, description: &str) {
@@ -276,7 +275,7 @@ impl Node {
 
     pub fn add_property(&self, name: String, value: String) {
         let private = imp::Node::from_instance(self);
-        println!("{} {} updated", name, value);
+        println!("property name={} updated with value={}", name, value);
         private.properties.borrow_mut().insert(name, value);
         self.update_description();
     }

src/graphmanager/port.rs

@@ -18,7 +18,7 @@
 //
 // SPDX-License-Identifier: GPL-3.0-only
 use gtk::{
-    glib::{self, subclass::Signal},
+    glib::{self},
     prelude::*,
     subclass::prelude::*,
 };
@@ -36,8 +36,6 @@ pub enum PortDirection {
 impl fmt::Display for PortDirection {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{:?}", self)
-        // or, alternatively:
-        // fmt::Debug::fmt(self, f)
     }
 }
 
@@ -54,7 +52,7 @@ impl PortDirection {
 
 mod imp {
     use super::*;
-    use once_cell::{sync::Lazy, unsync::OnceCell};
+    use once_cell::unsync::OnceCell;
 
     /// Graphical representation of a pipewire port.
     #[derive(Default, Clone)]
@@ -85,21 +83,6 @@ mod imp {
                 label.unparent()
             }
         }
-
-        fn signals() -> &'static [Signal] {
-            static SIGNALS: Lazy<Vec<Signal>> = Lazy::new(|| {
-                vec![Signal::builder(
-                    "port-toggled",
-                    // Provide id of output port and input port to signal handler.
-                    &[<u32>::static_type().into(), <u32>::static_type().into()],
-                    // signal handler sends back nothing.
-                    <()>::static_type().into(),
-                )
-                .build()]
-            });
-
-            SIGNALS.as_ref()
-        }
     }
     impl WidgetImpl for Port {}
 }