feat: add new crates ui-gpui and ui-iced to workspace

ui-iced/src/lib.rs

@@ -0,0 +1,53 @@
+use iced::{Element, Task};
+
+struct State {
+    screen: Screen,
+}
+
+enum Screen {
+    Contacts(Contacts),
+    Conversation(Conversation),
+}
+
+enum Message {
+    Contacts(contacts::Message),
+    Conversation(conversation::Message),
+}
+
+fn update(state: &mut State, message: Message) -> Task<Message> {
+    match message {
+        Message::Contacts(message) => {
+            if let Screen::Contacts(contacts) = &mut state.screen {
+                let action = contacts.update(message);
+
+                match action {
+                    contacts::Action::None => Task::none(),
+                    contacts::Action::Run(task) => task.map(Message::Contacts),
+                    contacts::Action::Chat(contact) => {
+                        let (conversation, task) = Conversation::new(contact);
+
+                        state.screen = Screen::Conversation(conversation);
+
+                        task.map(Message::Conversation)
+                    }
+                }
+            } else {
+                Task::none()
+            }
+        }
+        Message::Conversation(message) => {
+            if let Screen::Conversation(conversation) = &mut state.screen {
+                conversation.update(message).map(Message::Conversation)
+            } else {
+                Task::none()
+            }
+        }
+    }
+}
+
+fn view(state: &State) -> Element<Message> {
+    match &state.screen {
+        Screen::Contacts(contacts) => contacts.view().map(Message::Contacts),
+        Screen::Conversation(conversation) => conversation.view().map(Message::Conversation),
+    }
+}