Theme · Platform: one platform for buttons and caps, icon themes, frosted panes

theme::Platform moves out of typography and shell's ControlsStyle folds
into it; the theme's platform starts as the system's. Window buttons Ely
draws, the title bar's layout and every key cap follow it, secondary
included, through typography::keys::keystroke; a title bar whose buttons
the OS draws follows the OS. primitives::IconTheme lays an owner's rules
by file name and extension over Ely's map, for every file icon.
shell::Vibrancy fills a pane with the palette's new glass, translucent
so a window opened Blurred shows its backdrop, solid under high contrast.
gpui 0.2.2 has no Mica; that line stays blocked.

src/theme/mod.rs

@@ -9,6 +9,7 @@ mod media;
 mod messaging;
 mod onboarding;
 mod palette;
+mod platform;
 mod project;
 mod syntax;
 mod tokens;
@@ -32,6 +33,7 @@ pub use media::MediaSizes;
 pub use messaging::MessagingSizes;
 pub use onboarding::OnboardingSizes;
 pub use palette::{HUE_NAMES, Mix, Palette, Syntax};
+pub use platform::Platform;
 pub use project::ProjectSizes;
 pub use syntax::{SyntaxTheme, syntax_themes};
 pub use tokens::{
@@ -69,6 +71,7 @@ pub struct Theme {
     pub font_family: SharedString,
     pub mono_family: SharedString,
     pub reduced_motion: bool,
+    pub platform: Platform,
 }
 
 impl Global for Theme {}
@@ -97,6 +100,7 @@ impl Theme {
             font_family: "Inter".into(),
             mono_family: "JetBrains Mono".into(),
             reduced_motion: false,
+            platform: Platform::current(),
         });
     }
 

src/theme/palette.rs

@@ -116,6 +116,7 @@ mixable!(
         backdrop,
         media_backdrop,
         shimmer,
+        glass,
         shadow,
         tooltip_bg,
         tooltip_fg,
@@ -182,6 +183,7 @@ impl Palette {
             backdrop: rgba(0x18161352).into(),
             media_backdrop: rgba(0x0e0d0bf8).into(),
             shimmer: rgba(0xffffffb3).into(),
+            glass: rgba(0xfcfaf7b8).into(),
             shadow: c(0x181613),
             tooltip_bg: c(0x181613),
             tooltip_fg: c(0xfcfaf7),
@@ -215,6 +217,7 @@ impl Palette {
             palette.fg_subtle = c(0x575552);
             palette.border = c(0xa6a4a2);
             palette.border_strong = c(0x82807d);
+            palette.glass = palette.bg;
         }
         palette
     }
@@ -251,6 +254,7 @@ impl Palette {
             backdrop: rgba(0x00000080).into(),
             media_backdrop: rgba(0x000000f8).into(),
             shimmer: rgba(0xffffff10).into(),
+            glass: rgba(0x131110b8).into(),
             shadow: c(0x000000),
             tooltip_bg: c(0x373533),
             tooltip_fg: c(0xf3f1f0),
@@ -284,6 +288,7 @@ impl Palette {
             palette.fg_subtle = c(0xafadab);
             palette.border = c(0x6a6966);
             palette.border_strong = c(0x858380);
+            palette.glass = palette.bg;
         }
         palette
     }

src/theme/platform.rs

@@ -0,0 +1,20 @@
+/// Whose conventions the components follow: window buttons, the title bar's layout and key caps.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Platform {
+    Mac,
+    Windows,
+    Linux,
+}
+
+impl Platform {
+    /// The system this build targets, where the theme starts.
+    pub fn current() -> Self {
+        if cfg!(target_os = "macos") {
+            Platform::Mac
+        } else if cfg!(target_os = "windows") {
+            Platform::Windows
+        } else {
+            Platform::Linux
+        }
+    }
+}

src/theme/tests.rs

@@ -26,7 +26,7 @@ fn every_color_answers_to_its_name() {
     for (ix, name) in Palette::NAMES.iter().enumerate() {
         *palette.token_mut(name) = hsla(ix as f32 / 64.0, 0.5, 0.5, 1.0);
     }
-    assert_eq!(Palette::NAMES.len(), 35, "every color of the palette");
+    assert_eq!(Palette::NAMES.len(), 36, "every color of the palette");
     let at = |name: &str| {
         Palette::NAMES
             .iter()
@@ -50,3 +50,18 @@ fn every_color_answers_to_its_name() {
 fn an_unknown_color_fails() {
     Palette::light(false).token_mut("glow");
 }
+
+#[test]
+fn glass_lets_the_blur_through_until_high_contrast() {
+    for (plain, strong) in [
+        (Palette::light(false), Palette::light(true)),
+        (Palette::dark(false), Palette::dark(true)),
+    ] {
+        assert!(
+            plain.glass.a > 0.0 && plain.glass.a < 1.0,
+            "{:?}",
+            plain.glass
+        );
+        assert_eq!(strong.glass, strong.bg);
+    }
+}