feature (ui): implemented reverse plane cycling using <Shift>+<Tab> as requested in #5

src/app/event.rs

@@ -126,6 +126,12 @@ impl Event {
                 }) => {
                     app.ui.cycle_main_input_position();
                 }
+                crossterm::event::Event::Key(KeyEvent {
+                    code: KeyCode::BackTab,
+                    ..
+                }) => {
+                    app.ui.cycle_main_input_position_rev();
+                }
                 input => match app.ui.input_position() {
                     ui::MainInputPosition::MessageCompose => {
                         match input {
@@ -256,6 +262,12 @@ impl Event {
                 }) => {
                     ui.cycle_input_position();
                 }
+                crossterm::event::Event::Key(KeyEvent {
+                    code: KeyCode::BackTab,
+                    ..
+                }) => {
+                    ui.cycle_input_position_rev();
+                }
                 crossterm::event::Event::Key(KeyEvent {
                     code: KeyCode::Enter,
                     ..

src/ui/mod.rs

@@ -155,6 +155,35 @@ impl SetupUI<'_> {
         };
     }
 
+    pub fn cycle_input_position_rev(&mut self) {
+        self.input_position = match self.input_position {
+            SetupInputPosition::Homeserver => {
+                textarea_inactivate(&mut self.homeserver);
+                textarea_inactivate(&mut self.username);
+                textarea_inactivate(&mut self.password);
+                SetupInputPosition::Ok
+            }
+            SetupInputPosition::Username => {
+                textarea_activate(&mut self.homeserver);
+                textarea_inactivate(&mut self.username);
+                textarea_inactivate(&mut self.password);
+                SetupInputPosition::Homeserver
+            }
+            SetupInputPosition::Password => {
+                textarea_inactivate(&mut self.homeserver);
+                textarea_activate(&mut self.username);
+                textarea_inactivate(&mut self.password);
+                SetupInputPosition::Username
+            }
+            SetupInputPosition::Ok => {
+                textarea_inactivate(&mut self.homeserver);
+                textarea_inactivate(&mut self.username);
+                textarea_activate(&mut self.password);
+                SetupInputPosition::Password
+            }
+        };
+    }
+
     pub fn input_position(&self) -> &SetupInputPosition {
         &self.input_position
     }
@@ -251,6 +280,16 @@ impl UI<'_> {
         };
     }
 
+    pub fn cycle_main_input_position_rev(&mut self) {
+        self.input_position = match self.input_position {
+            MainInputPosition::Status => MainInputPosition::RoomInfo,
+            MainInputPosition::Rooms => MainInputPosition::Status,
+            MainInputPosition::Messages => MainInputPosition::Rooms,
+            MainInputPosition::MessageCompose => MainInputPosition::Messages,
+            MainInputPosition::RoomInfo => MainInputPosition::MessageCompose,
+        };
+    }
+
     pub fn input_position(&self) -> &MainInputPosition {
         &self.input_position
     }