feat: add ThemeBuilder

cosmic-theme/src/model/spacing.rs

@@ -0,0 +1,43 @@
+use serde::{Deserialize, Serialize};
+
+/// Spacing variables for the Cosmic theme
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Deserialize, Serialize)]
+pub struct Spacing {
+    /// No spacing
+    pub space_none: u16,
+    /// smallest spacing that can be non-zero
+    pub space_xxxs: u16,
+    /// extra extra small spacing
+    pub space_xxs: u16,
+    /// extra small spacing
+    pub space_xs: u16,
+    /// small spacing
+    pub space_s: u16,
+    /// medium spacing
+    pub space_m: u16,
+    /// large spacing
+    pub space_l: u16,
+    /// extra large spacing
+    pub space_xl: u16,
+    /// extra extra large spacing
+    pub space_xxl: u16,
+    /// largest possible spacing
+    pub space_xxxl: u16,
+}
+
+impl Default for Spacing {
+    fn default() -> Self {
+        Self {
+            space_none: 0,
+            space_xxxs: 4,
+            space_xxs: 8,
+            space_xs: 12,
+            space_s: 16,
+            space_m: 24,
+            space_l: 32,
+            space_xl: 48,
+            space_xxl: 64,
+            space_xxxl: 128,
+        }
+    }
+}