feat!: implement Application API

src/app/core.rs

@@ -0,0 +1,144 @@
+// Copyright 2023 System76 <info@system76.com>
+// SPDX-License-Identifier: MPL-2.0
+
+use crate::{theme, Theme};
+
+/// Status of the nav bar and its panels.
+#[derive(Clone)]
+pub struct NavBar {
+    active: bool,
+    toggled: bool,
+    toggled_condensed: bool,
+}
+
+/// COSMIC-specific settings for windows.
+#[allow(clippy::struct_excessive_bools)]
+#[derive(Clone)]
+pub struct Window {
+    pub can_fullscreen: bool,
+    pub sharp_corners: bool,
+    pub show_headerbar: bool,
+    pub show_window_menu: bool,
+    pub show_maximize: bool,
+    pub show_minimize: bool,
+    height: u32,
+    width: u32,
+}
+
+/// COSMIC-specific application settings
+#[derive(Clone)]
+pub struct Core {
+    /// Enables debug features in cosmic/iced.
+    pub debug: bool,
+
+    /// Whether the window is too small for the nav bar + main content.
+    is_condensed: bool,
+
+    /// Current status of the nav bar panel.
+    nav_bar: NavBar,
+
+    /// Scaling factor used by the application
+    scale_factor: f32,
+
+    pub theme: Theme,
+    pub(crate) title: String,
+    pub window: Window,
+}
+
+impl Default for Core {
+    fn default() -> Self {
+        Self {
+            debug: false,
+            is_condensed: false,
+            nav_bar: NavBar {
+                active: true,
+                toggled: true,
+                toggled_condensed: true,
+            },
+            scale_factor: 1.0,
+            theme: theme::theme(),
+            title: String::new(),
+            window: Window {
+                can_fullscreen: false,
+                sharp_corners: false,
+                show_headerbar: true,
+                show_maximize: true,
+                show_minimize: true,
+                show_window_menu: false,
+                height: 0,
+                width: 0,
+            },
+        }
+    }
+}
+
+impl Core {
+    /// Whether the window is too small for the nav bar + main content.
+    #[must_use]
+    pub fn is_condensed(&self) -> bool {
+        self.is_condensed
+    }
+
+    /// The scaling factor used by the application.
+    #[must_use]
+    pub fn scale_factor(&self) -> f32 {
+        self.scale_factor
+    }
+
+    /// Changes the scaling factor used by the application.
+    pub(crate) fn set_scale_factor(&mut self, factor: f32) {
+        self.scale_factor = factor;
+        self.is_condensed_update();
+    }
+
+    /// Whether to show or hide the main window's content.
+    pub(crate) fn show_content(&self) -> bool {
+        !self.is_condensed || !self.nav_bar.toggled_condensed
+    }
+
+    /// Call this whenever the scaling factor or window width has changed.
+    #[allow(clippy::cast_precision_loss)]
+    fn is_condensed_update(&mut self) {
+        self.is_condensed = (600.0 * self.scale_factor) > self.window.width as f32;
+        self.nav_bar_update();
+    }
+
+    /// Whether the nav panel is visible or not
+    #[must_use]
+    pub fn nav_bar_active(&self) -> bool {
+        self.nav_bar.active
+    }
+
+    pub fn nav_bar_toggle(&mut self) {
+        self.nav_bar.toggled = !self.nav_bar.toggled;
+        self.nav_bar_set_toggled_condensed(self.nav_bar.toggled);
+    }
+
+    pub fn nav_bar_toggle_condensed(&mut self) {
+        self.nav_bar_set_toggled_condensed(!self.nav_bar.toggled_condensed);
+    }
+
+    pub(crate) fn nav_bar_set_toggled_condensed(&mut self, toggled: bool) {
+        self.nav_bar.toggled_condensed = toggled;
+        self.nav_bar_update();
+    }
+
+    pub(crate) fn nav_bar_update(&mut self) {
+        self.nav_bar.active = if self.is_condensed {
+            self.nav_bar.toggled_condensed
+        } else {
+            self.nav_bar.toggled
+        };
+    }
+
+    /// Set the height of the main window.
+    pub(crate) fn set_window_height(&mut self, new_height: u32) {
+        self.window.height = new_height;
+    }
+
+    /// Set the width of the main window.
+    pub(crate) fn set_window_width(&mut self, new_width: u32) {
+        self.window.width = new_width;
+        self.is_condensed_update();
+    }
+}