app: add graph pop menu

Add a pop menu to add new plugin to the graph

src/app.rs

@@ -292,6 +292,10 @@ impl GPSApp {
             }
         }
     }
+    pub fn display_plugin_list(app: &GPSApp) {
+        let elements = Pipeline::elements_list().expect("Unable to obtain element's list");
+        plugindialogs::display_plugin_list(app, &elements);
+    }
 
     pub fn build_ui(&self, application: &Application) {
         let drawing_area_window: Viewport = self
@@ -395,8 +399,7 @@ impl GPSApp {
         let app_weak = self.downgrade();
         add_button.connect_clicked(glib::clone!(@weak window => move |_| {
             let app = upgrade_weak!(app_weak);
-            let elements = Pipeline::elements_list().expect("Unable to obtain element's list");
+            GPSApp::display_plugin_list(&app);
-            plugindialogs::display_plugin_list(&app, &elements);
         }));
 
         let add_button: Button = self
@@ -467,7 +470,44 @@ impl GPSApp {
             let app = upgrade_weak!(app_weak);
             app.load_graph("graphs/video.xml").expect("Unable to open file");
         }));
+        let app_weak = self.downgrade();
+        // When user clicks on port with right button
+        self.graphview
+            .borrow()
+            .connect_local(
+                "graph-right-clicked",
+                false,
+                glib::clone!(@weak application =>  @default-return None, move |values: &[Value]| {
+                    let app = upgrade_weak!(app_weak, None);
 
+                    let point = values[1].get::<graphene::Point>().expect("point in args[2]");
+
+                    let port_menu: gio::MenuModel = app
+                        .builder
+                        .object("graph_menu")
+                        .expect("Couldn't get menu model for graph");
+
+                    let pop_menu: PopoverMenu = PopoverMenu::from_model(Some(&port_menu));
+                    pop_menu.set_parent(&*app.graphview.borrow_mut());
+                    pop_menu.set_pointing_to(&Rectangle {
+                        x: point.to_vec2().x() as i32,
+                        y: point.to_vec2().y() as i32,
+                        width: 0,
+                        height: 0,
+                    });
+                    // add an action to delete link
+                    let action = gio::SimpleAction::new("graph.add-plugin", None);
+                    action.connect_activate(glib::clone!(@weak pop_menu => move |_,_| {
+                        GPSApp::display_plugin_list(&app);
+                        pop_menu.unparent();
+                    }));
+                    application.add_action(&action);
+
+                    pop_menu.show();
+                    None
+                }),
+            )
+            .expect("Failed to register graph-right-clicked signal of graphview");
         let app_weak = self.downgrade();
         // When user clicks on port with right button
         self.graphview

src/gps.ui

@@ -34,6 +34,14 @@
         <attribute name="label" translatable="yes" comments="port menu entry delete the link">_Delete link</attribute>
         <attribute name="action">app.port.delete-link</attribute>
       </item>
+    </section>
+  </menu>
+  <menu id="graph_menu">
+    <section>
+      <item>
+        <attribute name="label" translatable="yes" comments="graph menu entry add plugin">_Add plugin</attribute>
+        <attribute name="action">app.graph.add-plugin</attribute>
+      </item>
       </section>
   </menu>
   <menu id="fav_menu">

src/graphmanager/graphview.rs

@@ -146,6 +146,9 @@ mod imp {
                             widget.unselect_all();
                             node.set_selected(true);
                             obj.emit_by_name("node-right-clicked", &[&node.id(), &graphene::Point::new(x as f32,y as f32)]).expect("unable to send signal");
+                        } else {
+                            widget.unselect_all();
+                            obj.emit_by_name("graph-right-clicked", &[&graphene::Point::new(x as f32,y as f32)]).expect("unable to send signal");
                         }
                     } else if gesture.current_button() == BUTTON_PRIMARY {
                         let widget = drag_controller.widget().expect("click event has no widget")
@@ -243,6 +246,12 @@ mod imp {
                         <()>::static_type().into(),
                     )
                     .build(),
+                    Signal::builder(
+                        "graph-right-clicked",
+                        &[graphene::Point::static_type().into()],
+                        <()>::static_type().into(),
+                    )
+                    .build(),
                 ]
             });
             SIGNALS.as_ref()