feat(notification): When clicking on a notification, activate the corresponding channel

Closes #280.

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Startup screen when loading messages.
+- Clicking on a notification now brings up the channel the notification came from.
 
 ### Changed
 

src/backend/channel.rs

@@ -591,6 +591,28 @@ impl Channel {
             })
             .collect()
     }
+
+    pub fn notification_variant(&self) -> (u8, Vec<u8>) {
+        let thread = self.thread();
+        match thread {
+            Thread::Contact(u) => (0, u.service_id_binary()),
+            Thread::Group(g) => (1, g.into()),
+        }
+    }
+
+    pub fn from_notification_variant((kind, data): (u8, Vec<u8>)) -> Thread {
+        match kind {
+            0 => Thread::Contact(
+                ServiceId::parse_from_service_id_binary(&data)
+                    .expect("Notification variant for contact to be a service ID"),
+            ),
+            1 => Thread::Group(
+                data.try_into()
+                    .expect("Notification variant for groups to have the correct number of bytes"),
+            ),
+            _ => unreachable!("Unexpected notification variant type"),
+        }
+    }
 }
 
 mod imp {

src/backend/manager.rs

@@ -472,6 +472,11 @@ impl Manager {
         channel
     }
 
+    pub fn channel_from_thread(&self, thread: Thread) -> Option<Channel> {
+        let known_channels = self.imp().channels.borrow_mut();
+        known_channels.get(&thread).cloned()
+    }
+
     #[cfg(not(feature = "screenshot"))]
     pub async fn list_contacts(&self) -> Vec<Contact> {
         let store = self.store();

src/backend/message/display_message.rs

@@ -41,6 +41,10 @@ impl DisplayMessage {
         notification.set_body(Some(&notification_body));
         notification.set_icon(&icon);
         notification.set_category(Some("im.received"));
+        notification.set_default_action_and_target_value(
+            "app.notification-clicked",
+            Some(&channel.notification_variant().to_variant()),
+        );
 
         let manager = self.manager();
         let uid = self.uid();

src/backend/message/reaction_message.rs

@@ -96,6 +96,10 @@ impl ReactionMessage {
         notification.set_body(Some(&notification_body));
         notification.set_icon(&icon);
         notification.set_category(Some("im.received"));
+        notification.set_default_action_and_target_value(
+            "app.notification-clicked",
+            Some(&channel.notification_variant().to_variant()),
+        );
 
         let manager = self.manager();
         let uid = self.uid();

src/gui/window.rs

@@ -1,4 +1,7 @@
-use crate::prelude::*;
+use gio::SimpleAction;
+use presage::store::Thread;
+
+use crate::{backend::Channel, prelude::*};
 
 glib::wrapper! {
     /// The main application window.
@@ -24,9 +27,30 @@ impl Window {
             );
         }
         app.set_accels_for_action("channel-list.toggle-search", &["<Control>f"]);
-        Object::builder::<Self>()
+
+        let window = Object::builder::<Self>()
             .property("application", app)
-            .build()
+            .build();
+
+        let action_notification_clicked = SimpleAction::new(
+            "notification-clicked",
+            Some(&<(u8, Vec<u8>)>::static_variant_type()),
+        );
+        action_notification_clicked.connect_activate(clone!(
+            #[weak]
+            window,
+            move |_, variant| {
+                let variant: (u8, Vec<u8>) = variant
+                    .expect("Notification-clicked action to have attached data")
+                    .get()
+                    .expect("Variant of notification is of unexpected type");
+                let thread = Channel::from_notification_variant(variant);
+                window.activate_channel(thread);
+            }
+        ));
+        app.add_action(&action_notification_clicked);
+
+        window
     }
 
     // Closes the window, even if hide-on-close is set.
@@ -69,6 +93,13 @@ impl Window {
         }
     }
 
+    fn activate_channel(&self, thread: Thread) {
+        let channel = self
+            .property::<Manager>("manager")
+            .channel_from_thread(thread);
+        self.imp().channel_list.set_active_channel(channel);
+    }
+
     pub(crate) fn settings(&self) -> gio::Settings {
         self.imp().settings.clone()
     }