Move `Theme` type to `iced_core`

1 files changed, 625 insertions, 0 deletions

diff --git a/core/src/theme/palette.rs b/core/src/theme/palette.rs
new file mode 100644
index 00000000..985a54a8
--- /dev/null
+++ b/core/src/theme/palette.rs
@@ -0,0 +1,625 @@
+//! Define the colors of a theme.
+use crate::{color, Color};
+
+use once_cell::sync::Lazy;
+use palette::color_difference::Wcag21RelativeContrast;
+use palette::rgb::Rgb;
+use palette::{FromColor, Hsl, Mix};
+
+/// A color palette.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Palette {
+    /// The background [`Color`] of the [`Palette`].
+    pub background: Color,
+    /// The text [`Color`] of the [`Palette`].
+    pub text: Color,
+    /// The primary [`Color`] of the [`Palette`].
+    pub primary: Color,
+    /// The success [`Color`] of the [`Palette`].
+    pub success: Color,
+    /// The danger [`Color`] of the [`Palette`].
+    pub danger: Color,
+}
+
+impl Palette {
+    /// The built-in light variant of a [`Palette`].
+    pub const LIGHT: Self = Self {
+        background: Color::WHITE,
+        text: Color::BLACK,
+        primary: Color::from_rgb(
+            0x5E as f32 / 255.0,
+            0x7C as f32 / 255.0,
+            0xE2 as f32 / 255.0,
+        ),
+        success: Color::from_rgb(
+            0x12 as f32 / 255.0,
+            0x66 as f32 / 255.0,
+            0x4F as f32 / 255.0,
+        ),
+        danger: Color::from_rgb(
+            0xC3 as f32 / 255.0,
+            0x42 as f32 / 255.0,
+            0x3F as f32 / 255.0,
+        ),
+    };
+
+    /// The built-in dark variant of a [`Palette`].
+    pub const DARK: Self = Self {
+        background: Color::from_rgb(
+            0x20 as f32 / 255.0,
+            0x22 as f32 / 255.0,
+            0x25 as f32 / 255.0,
+        ),
+        text: Color::from_rgb(0.90, 0.90, 0.90),
+        primary: Color::from_rgb(
+            0x5E as f32 / 255.0,
+            0x7C as f32 / 255.0,
+            0xE2 as f32 / 255.0,
+        ),
+        success: Color::from_rgb(
+            0x12 as f32 / 255.0,
+            0x66 as f32 / 255.0,
+            0x4F as f32 / 255.0,
+        ),
+        danger: Color::from_rgb(
+            0xC3 as f32 / 255.0,
+            0x42 as f32 / 255.0,
+            0x3F as f32 / 255.0,
+        ),
+    };
+
+    /// The built-in [Dracula] variant of a [`Palette`].
+    ///
+    /// [Dracula]: https://draculatheme.com
+    pub const DRACULA: Self = Self {
+        background: color!(0x282A36), // BACKGROUND
+        text: color!(0xf8f8f2),       // FOREGROUND
+        primary: color!(0xbd93f9),    // PURPLE
+        success: color!(0x50fa7b),    // GREEN
+        danger: color!(0xff5555),     // RED
+    };
+
+    /// The built-in [Nord] variant of a [`Palette`].
+    ///
+    /// [Nord]: https://www.nordtheme.com/docs/colors-and-palettes
+    pub const NORD: Self = Self {
+        background: color!(0x2e3440), // nord0
+        text: color!(0xeceff4),       // nord6
+        primary: color!(0x8fbcbb),    // nord7
+        success: color!(0xa3be8c),    // nord14
+        danger: color!(0xbf616a),     // nord11
+    };
+
+    /// The built-in [Solarized] Light variant of a [`Palette`].
+    ///
+    /// [Solarized]: https://ethanschoonover.com/solarized
+    pub const SOLARIZED_LIGHT: Self = Self {
+        background: color!(0xfdf6e3), // base3
+        text: color!(0x657b83),       // base00
+        primary: color!(0x2aa198),    // cyan
+        success: color!(0x859900),    // green
+        danger: color!(0xdc322f),     // red
+    };
+
+    /// The built-in [Solarized] Dark variant of a [`Palette`].
+    ///
+    /// [Solarized]: https://ethanschoonover.com/solarized
+    pub const SOLARIZED_DARK: Self = Self {
+        background: color!(0x002b36), // base03
+        text: color!(0x839496),       // base0
+        primary: color!(0x2aa198),    // cyan
+        success: color!(0x859900),    // green
+        danger: color!(0xdc322f),     // red
+    };
+
+    /// The built-in [Gruvbox] Light variant of a [`Palette`].
+    ///
+    /// [Gruvbox]: https://github.com/morhetz/gruvbox
+    pub const GRUVBOX_LIGHT: Self = Self {
+        background: color!(0xfbf1c7), // light BG_0
+        text: color!(0x282828),       // light FG0_29
+        primary: color!(0x458588),    // light BLUE_4
+        success: color!(0x98971a),    // light GREEN_2
+        danger: color!(0xcc241d),     // light RED_1
+    };
+
+    /// The built-in [Gruvbox] Dark variant of a [`Palette`].
+    ///
+    /// [Gruvbox]: https://github.com/morhetz/gruvbox
+    pub const GRUVBOX_DARK: Self = Self {
+        background: color!(0x282828), // dark BG_0
+        text: color!(0xfbf1c7),       // dark FG0_29
+        primary: color!(0x458588),    // dark BLUE_4
+        success: color!(0x98971a),    // dark GREEN_2
+        danger: color!(0xcc241d),     // dark RED_1
+    };
+
+    /// The built-in [Catppuccin] Latte variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_LATTE: Self = Self {
+        background: color!(0xeff1f5), // Base
+        text: color!(0x4c4f69),       // Text
+        primary: color!(0x1e66f5),    // Blue
+        success: color!(0x40a02b),    // Green
+        danger: color!(0xd20f39),     // Red
+    };
+
+    /// The built-in [Catppuccin] Frappé variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_FRAPPE: Self = Self {
+        background: color!(0x303446), // Base
+        text: color!(0xc6d0f5),       // Text
+        primary: color!(0x8caaee),    // Blue
+        success: color!(0xa6d189),    // Green
+        danger: color!(0xe78284),     // Red
+    };
+
+    /// The built-in [Catppuccin] Macchiato variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_MACCHIATO: Self = Self {
+        background: color!(0x24273a), // Base
+        text: color!(0xcad3f5),       // Text
+        primary: color!(0x8aadf4),    // Blue
+        success: color!(0xa6da95),    // Green
+        danger: color!(0xed8796),     // Red
+    };
+
+    /// The built-in [Catppuccin] Mocha variant of a [`Palette`].
+    ///
+    /// [Catppuccin]: https://github.com/catppuccin/catppuccin
+    pub const CATPPUCCIN_MOCHA: Self = Self {
+        background: color!(0x1e1e2e), // Base
+        text: color!(0xcdd6f4),       // Text
+        primary: color!(0x89b4fa),    // Blue
+        success: color!(0xa6e3a1),    // Green
+        danger: color!(0xf38ba8),     // Red
+    };
+
+    /// The built-in [Tokyo Night] variant of a [`Palette`].
+    ///
+    /// [Tokyo Night]: https://github.com/enkia/tokyo-night-vscode-theme
+    pub const TOKYO_NIGHT: Self = Self {
+        background: color!(0x1a1b26), // Background (Night)
+        text: color!(0x9aa5ce),       // Text
+        primary: color!(0x2ac3de),    // Blue
+        success: color!(0x9ece6a),    // Green
+        danger: color!(0xf7768e),     // Red
+    };
+
+    /// The built-in [Tokyo Night] Storm variant of a [`Palette`].
+    ///
+    /// [Tokyo Night]: https://github.com/enkia/tokyo-night-vscode-theme
+    pub const TOKYO_NIGHT_STORM: Self = Self {
+        background: color!(0x24283b), // Background (Storm)
+        text: color!(0x9aa5ce),       // Text
+        primary: color!(0x2ac3de),    // Blue
+        success: color!(0x9ece6a),    // Green
+        danger: color!(0xf7768e),     // Red
+    };
+
+    /// The built-in [Tokyo Night] Light variant of a [`Palette`].
+    ///
+    /// [Tokyo Night]: https://github.com/enkia/tokyo-night-vscode-theme
+    pub const TOKYO_NIGHT_LIGHT: Self = Self {
+        background: color!(0xd5d6db), // Background
+        text: color!(0x565a6e),       // Text
+        primary: color!(0x166775),    // Blue
+        success: color!(0x485e30),    // Green
+        danger: color!(0x8c4351),     // Red
+    };
+
+    /// The built-in [Kanagawa] Wave variant of a [`Palette`].
+    ///
+    /// [Kanagawa]: https://github.com/rebelot/kanagawa.nvim
+    pub const KANAGAWA_WAVE: Self = Self {
+        background: color!(0x363646), // Sumi Ink 3
+        text: color!(0xCD7BA),        // Fuji White
+        primary: color!(0x2D4F67),    // Wave Blue 2
+        success: color!(0x76946A),    // Autumn Green
+        danger: color!(0xC34043),     // Autumn Red
+    };
+
+    /// The built-in [Kanagawa] Dragon variant of a [`Palette`].
+    ///
+    /// [Kanagawa]: https://github.com/rebelot/kanagawa.nvim
+    pub const KANAGAWA_DRAGON: Self = Self {
+        background: color!(0x181616), // Dragon Black 3
+        text: color!(0xc5c9c5),       // Dragon White
+        primary: color!(0x223249),    // Wave Blue 1
+        success: color!(0x8a9a7b),    // Dragon Green 2
+        danger: color!(0xc4746e),     // Dragon Red
+    };
+
+    /// The built-in [Kanagawa] Lotus variant of a [`Palette`].
+    ///
+    /// [Kanagawa]: https://github.com/rebelot/kanagawa.nvim
+    pub const KANAGAWA_LOTUS: Self = Self {
+        background: color!(0xf2ecbc), // Lotus White 3
+        text: color!(0x545464),       // Lotus Ink 1
+        primary: color!(0xc9cbd1),    // Lotus Violet 3
+        success: color!(0x6f894e),    // Lotus Green
+        danger: color!(0xc84053),     // Lotus Red
+    };
+
+    /// The built-in [Moonfly] variant of a [`Palette`].
+    ///
+    /// [Moonfly]: https://github.com/bluz71/vim-moonfly-colors
+    pub const MOONFLY: Self = Self {
+        background: color!(0x080808), // Background
+        text: color!(0xbdbdbd),       // Foreground
+        primary: color!(0x80a0ff),    // Blue (normal)
+        success: color!(0x8cc85f),    // Green (normal)
+        danger: color!(0xff5454),     // Red (normal)
+    };
+
+    /// The built-in [Nightfly] variant of a [`Palette`].
+    ///
+    /// [Nightfly]: https://github.com/bluz71/vim-nightfly-colors
+    pub const NIGHTFLY: Self = Self {
+        background: color!(0x011627), // Background
+        text: color!(0xbdc1c6),       // Foreground
+        primary: color!(0x82aaff),    // Blue (normal)
+        success: color!(0xa1cd5e),    // Green (normal)
+        danger: color!(0xfc514e),     // Red (normal)
+    };
+
+    /// The built-in [Oxocarbon] variant of a [`Palette`].
+    ///
+    /// [Oxocarbon]: https://github.com/nyoom-engineering/oxocarbon.nvim
+    pub const OXOCARBON: Self = Self {
+        background: color!(0x232323),
+        text: color!(0xd0d0d0),
+        primary: color!(0x00b4ff),
+        success: color!(0x00c15a),
+        danger: color!(0xf62d0f),
+    };
+}
+
+/// An extended set of colors generated from a [`Palette`].
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Extended {
+    /// The set of background colors.
+    pub background: Background,
+    /// The set of primary colors.
+    pub primary: Primary,
+    /// The set of secondary colors.
+    pub secondary: Secondary,
+    /// The set of success colors.
+    pub success: Success,
+    /// The set of danger colors.
+    pub danger: Danger,
+    /// Whether the palette is dark or not.
+    pub is_dark: bool,
+}
+
+/// The built-in light variant of an [`Extended`] palette.
+pub static EXTENDED_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::LIGHT));
+
+/// The built-in dark variant of an [`Extended`] palette.
+pub static EXTENDED_DARK: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::DARK));
+
+/// The built-in Dracula variant of an [`Extended`] palette.
+pub static EXTENDED_DRACULA: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::DRACULA));
+
+/// The built-in Nord variant of an [`Extended`] palette.
+pub static EXTENDED_NORD: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::NORD));
+
+/// The built-in Solarized Light variant of an [`Extended`] palette.
+pub static EXTENDED_SOLARIZED_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::SOLARIZED_LIGHT));
+
+/// The built-in Solarized Dark variant of an [`Extended`] palette.
+pub static EXTENDED_SOLARIZED_DARK: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::SOLARIZED_DARK));
+
+/// The built-in Gruvbox Light variant of an [`Extended`] palette.
+pub static EXTENDED_GRUVBOX_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::GRUVBOX_LIGHT));
+
+/// The built-in Gruvbox Dark variant of an [`Extended`] palette.
+pub static EXTENDED_GRUVBOX_DARK: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::GRUVBOX_DARK));
+
+/// The built-in Catppuccin Latte variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_LATTE: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_LATTE));
+
+/// The built-in Catppuccin Frappé variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_FRAPPE: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_FRAPPE));
+
+/// The built-in Catppuccin Macchiato variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_MACCHIATO: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_MACCHIATO));
+
+/// The built-in Catppuccin Mocha variant of an [`Extended`] palette.
+pub static EXTENDED_CATPPUCCIN_MOCHA: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::CATPPUCCIN_MOCHA));
+
+/// The built-in Tokyo Night variant of an [`Extended`] palette.
+pub static EXTENDED_TOKYO_NIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::TOKYO_NIGHT));
+
+/// The built-in Tokyo Night Storm variant of an [`Extended`] palette.
+pub static EXTENDED_TOKYO_NIGHT_STORM: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::TOKYO_NIGHT_STORM));
+
+/// The built-in Tokyo Night variant of an [`Extended`] palette.
+pub static EXTENDED_TOKYO_NIGHT_LIGHT: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::TOKYO_NIGHT_LIGHT));
+
+/// The built-in Kanagawa Wave variant of an [`Extended`] palette.
+pub static EXTENDED_KANAGAWA_WAVE: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::KANAGAWA_WAVE));
+
+/// The built-in Kanagawa Dragon variant of an [`Extended`] palette.
+pub static EXTENDED_KANAGAWA_DRAGON: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::KANAGAWA_DRAGON));
+
+/// The built-in Kanagawa Lotus variant of an [`Extended`] palette.
+pub static EXTENDED_KANAGAWA_LOTUS: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::KANAGAWA_LOTUS));
+
+/// The built-in Moonfly variant of an [`Extended`] palette.
+pub static EXTENDED_MOONFLY: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::MOONFLY));
+
+/// The built-in Nightfly variant of an [`Extended`] palette.
+pub static EXTENDED_NIGHTFLY: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::NIGHTFLY));
+
+/// The built-in Oxocarbon variant of an [`Extended`] palette.
+pub static EXTENDED_OXOCARBON: Lazy<Extended> =
+    Lazy::new(|| Extended::generate(Palette::OXOCARBON));
+
+impl Extended {
+    /// Generates an [`Extended`] palette from a simple [`Palette`].
+    pub fn generate(palette: Palette) -> Self {
+        Self {
+            background: Background::new(palette.background, palette.text),
+            primary: Primary::generate(
+                palette.primary,
+                palette.background,
+                palette.text,
+            ),
+            secondary: Secondary::generate(palette.background, palette.text),
+            success: Success::generate(
+                palette.success,
+                palette.background,
+                palette.text,
+            ),
+            danger: Danger::generate(
+                palette.danger,
+                palette.background,
+                palette.text,
+            ),
+            is_dark: is_dark(palette.background),
+        }
+    }
+}
+
+/// A pair of background and text colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Pair {
+    /// The background color.
+    pub color: Color,
+
+    /// The text color.
+    ///
+    /// It's guaranteed to be readable on top of the background [`color`].
+    ///
+    /// [`color`]: Self::color
+    pub text: Color,
+}
+
+impl Pair {
+    /// Creates a new [`Pair`] from a background [`Color`] and some text [`Color`].
+    pub fn new(color: Color, text: Color) -> Self {
+        Self {
+            color,
+            text: readable(color, text),
+        }
+    }
+}
+
+/// A set of background colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Background {
+    /// The base background color.
+    pub base: Pair,
+    /// A weaker version of the base background color.
+    pub weak: Pair,
+    /// A stronger version of the base background color.
+    pub strong: Pair,
+}
+
+impl Background {
+    /// Generates a set of [`Background`] colors from the base and text colors.
+    pub fn new(base: Color, text: Color) -> Self {
+        let weak = mix(base, text, 0.15);
+        let strong = mix(base, text, 0.40);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of primary colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Primary {
+    /// The base primary color.
+    pub base: Pair,
+    /// A weaker version of the base primary color.
+    pub weak: Pair,
+    /// A stronger version of the base primary color.
+    pub strong: Pair,
+}
+
+impl Primary {
+    /// Generates a set of [`Primary`] colors from the base, background, and text colors.
+    pub fn generate(base: Color, background: Color, text: Color) -> Self {
+        let weak = mix(base, background, 0.4);
+        let strong = deviate(base, 0.1);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of secondary colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Secondary {
+    /// The base secondary color.
+    pub base: Pair,
+    /// A weaker version of the base secondary color.
+    pub weak: Pair,
+    /// A stronger version of the base secondary color.
+    pub strong: Pair,
+}
+
+impl Secondary {
+    /// Generates a set of [`Secondary`] colors from the base and text colors.
+    pub fn generate(base: Color, text: Color) -> Self {
+        let base = mix(base, text, 0.2);
+        let weak = mix(base, text, 0.1);
+        let strong = mix(base, text, 0.3);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of success colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Success {
+    /// The base success color.
+    pub base: Pair,
+    /// A weaker version of the base success color.
+    pub weak: Pair,
+    /// A stronger version of the base success color.
+    pub strong: Pair,
+}
+
+impl Success {
+    /// Generates a set of [`Success`] colors from the base, background, and text colors.
+    pub fn generate(base: Color, background: Color, text: Color) -> Self {
+        let weak = mix(base, background, 0.4);
+        let strong = deviate(base, 0.1);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+/// A set of danger colors.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Danger {
+    /// The base danger color.
+    pub base: Pair,
+    /// A weaker version of the base danger color.
+    pub weak: Pair,
+    /// A stronger version of the base danger color.
+    pub strong: Pair,
+}
+
+impl Danger {
+    /// Generates a set of [`Danger`] colors from the base, background, and text colors.
+    pub fn generate(base: Color, background: Color, text: Color) -> Self {
+        let weak = mix(base, background, 0.4);
+        let strong = deviate(base, 0.1);
+
+        Self {
+            base: Pair::new(base, text),
+            weak: Pair::new(weak, text),
+            strong: Pair::new(strong, text),
+        }
+    }
+}
+
+fn darken(color: Color, amount: f32) -> Color {
+    let mut hsl = to_hsl(color);
+
+    hsl.lightness = if hsl.lightness - amount < 0.0 {
+        0.0
+    } else {
+        hsl.lightness - amount
+    };
+
+    from_hsl(hsl)
+}
+
+fn lighten(color: Color, amount: f32) -> Color {
+    let mut hsl = to_hsl(color);
+
+    hsl.lightness = if hsl.lightness + amount > 1.0 {
+        1.0
+    } else {
+        hsl.lightness + amount
+    };
+
+    from_hsl(hsl)
+}
+
+fn deviate(color: Color, amount: f32) -> Color {
+    if is_dark(color) {
+        lighten(color, amount)
+    } else {
+        darken(color, amount)
+    }
+}
+
+fn mix(a: Color, b: Color, factor: f32) -> Color {
+    let a_lin = Rgb::from(a).into_linear();
+    let b_lin = Rgb::from(b).into_linear();
+
+    let mixed = a_lin.mix(b_lin, factor);
+    Rgb::from_linear(mixed).into()
+}
+
+fn readable(background: Color, text: Color) -> Color {
+    if is_readable(background, text) {
+        text
+    } else if is_dark(background) {
+        Color::WHITE
+    } else {
+        Color::BLACK
+    }
+}
+
+fn is_dark(color: Color) -> bool {
+    to_hsl(color).lightness < 0.6
+}
+
+fn is_readable(a: Color, b: Color) -> bool {
+    let a_srgb = Rgb::from(a);
+    let b_srgb = Rgb::from(b);
+
+    a_srgb.has_enhanced_contrast_text(b_srgb)
+}
+
+fn to_hsl(color: Color) -> Hsl {
+    Hsl::from_color(Rgb::from(color))
+}
+
+fn from_hsl(hsl: Hsl) -> Color {
+    Rgb::from_color(hsl).into()
+}