Add popup toggle to settings view

Introduce `show_popup` flag in SettingsState, toggle it with the Space
key, and
render a yellow test popup in the settings view when the flag is true.

src/app/game_states.rs

@@ -39,6 +39,7 @@ pub struct SettingsState {
     pub id: usize,
     pub name: &'static str,
     pub selected_setting: usize,
+    pub show_popup: bool,
 }
 
 impl GameStates {
@@ -67,6 +68,7 @@ impl GameStates {
                 id: 4,
                 name: "Settings",
                 selected_setting: 0,
+                show_popup: false,
             },
         }
     }

src/app/keybindings/settings.rs

@@ -10,6 +10,10 @@ pub fn settings_keybindings(app: &mut App, key_event: &KeyEvent) {
             Action::Quit => app.exit = true,
             Action::Quit2 => app.exit = true,
             Action::Esc => app.view = View::MainMenu,
+            Action::Space => {
+                app.game_states.settings_state.show_popup =
+                    !app.game_states.settings_state.show_popup
+            }
             _ => (),
         }
     }

src/app/views/settings.rs

@@ -6,8 +6,8 @@ use crate::app::{
 use ratatui::{
     buffer::Buffer,
     layout::{Alignment, Constraint, Layout, Rect},
-    style::Stylize,
+    style::{Style, Stylize},
-    widgets::{Block, Borders, Padding, Paragraph, Widget},
+    widgets::{Block, Borders, Padding, Paragraph, Widget, Wrap},
 };
 
 pub fn settings_view(app: &App, area: Rect, buf: &mut Buffer) {
@@ -41,6 +41,28 @@ pub fn settings_view(app: &App, area: Rect, buf: &mut Buffer) {
         )
         .render(main_area, buf);
 
+    let popup_area = Rect {
+        x: main_area.width / 4,
+        y: main_area.height / 3,
+        width: main_area.width / 2,
+        height: main_area.height / 3,
+    };
+
+    let popup = Paragraph::new("Test popup")
+        .wrap(Wrap { trim: true })
+        .style(Style::default().yellow())
+        .block(
+            Block::new()
+                .title("Insert value")
+                .title_style(Style::default().green())
+                .borders(Borders::ALL)
+                .border_style(Style::default().blue()),
+        );
+
+    if app.game_states.settings_state.show_popup {
+        popup.render(popup_area, buf);
+    }
+
     {
         let keybindings: Vec<Option<&'static KeyBinding>> = vec![
             binding_for(Action::Up),