use gpui::{App, Font, Global, Pixels}; use crate::UiDensity; /// Trait for providing theme-related settings (fonts, font sizes, UI density)/// without coupling to the concrete settings infrastructure.////// A concrete implementation is registered as a global by the `theme_settings` crate.pub trait ThemeSettingsProvider: Send + Sync + 'static {    /// Returns the font used for UI elements.    fn ui_font<'a>(&'a self, cx: &'a App) -> &'a Font;     /// Returns the font used for buffers and the terminal.    fn buffer_font<'a>(&'a self, cx: &'a App) -> &'a Font;     /// Returns the UI font size in pixels.    fn ui_font_size(&self, cx: &App) -> Pixels;     /// Returns the buffer font size in pixels.    fn buffer_font_size(&self, cx: &App) -> Pixels;     /// Returns the current UI density setting.    fn ui_density(&self, cx: &App) -> UiDensity;} struct GlobalThemeSettingsProvider(Box<dyn ThemeSettingsProvider>); impl Global for GlobalThemeSettingsProvider {} /// Registers the global [`ThemeSettingsProvider`] implementation.////// This should be called during application initialization by the crate/// that owns the concrete theme settings (e.g. `theme_settings`).pub fn set_theme_settings_provider(provider: Box<dyn ThemeSettingsProvider>, cx: &mut App) {    cx.set_global(GlobalThemeSettingsProvider(provider));} /// Returns the global [`ThemeSettingsProvider`].////// Panics if no provider has been registered via [`set_theme_settings_provider`].pub fn theme_settings(cx: &App) -> &dyn ThemeSettingsProvider {    &*cx.global::<GlobalThemeSettingsProvider>().0}