fix: move density to cosmic_theme

cosmic-theme/src/model/density.rs

@@ -0,0 +1,65 @@
+use crate::Spacing;
+use serde::{Deserialize, Serialize};
+
+#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Serialize, Deserialize)]
+pub enum Density {
+    Compact,
+    Spacious,
+    #[default]
+    Standard,
+}
+
+impl From<Density> for Spacing {
+    fn from(value: Density) -> Self {
+        match value {
+            Density::Compact => Spacing {
+                space_none: 0,
+                space_xxxs: 4,
+                space_xxs: 4,
+                space_xs: 8,
+                space_s: 8,
+                space_m: 16,
+                space_l: 24,
+                space_xl: 32,
+                space_xxl: 48,
+                space_xxxl: 64,
+            },
+            Density::Spacious => Spacing {
+                space_none: 4,
+                space_xxxs: 8,
+                space_xxs: 12,
+                space_xs: 16,
+                space_s: 24,
+                space_m: 32,
+                space_l: 48,
+                space_xl: 64,
+                space_xxl: 128,
+                space_xxxl: 160,
+            },
+            Density::Standard => Spacing {
+                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,
+            },
+        }
+    }
+}
+
+impl From<Spacing> for Density {
+    fn from(value: Spacing) -> Self {
+        if value.space_m.saturating_sub(16) == 0 {
+            Self::Compact
+        } else if value.space_m.saturating_sub(24) == 0 {
+            Self::Standard
+        } else {
+            Self::Spacious
+        }
+    }
+}

cosmic-theme/src/model/mod.rs

@@ -1,5 +1,6 @@
 pub use corner::*;
 pub use cosmic_palette::*;
+pub use density::*;
 pub use derivation::*;
 pub use mode::*;
 pub use spacing::*;
@@ -7,6 +8,7 @@ pub use theme::*;
 
 mod corner;
 mod cosmic_palette;
+mod density;
 mod derivation;
 mod mode;
 mod spacing;