1use gpui::{
  2    div, rems, IntoElement, ParentElement, Rems, RenderOnce, SharedString, Styled, WindowContext,
  3};
  4use settings::Settings;
  5use theme::{ActiveTheme, ThemeSettings};
  6
  7use crate::rems_from_px;
  8
  9#[derive(Debug, Default, Clone)]
 10pub enum UiTextSize {
 11    /// The default size for UI text.
 12    ///
 13    /// `0.825rem` or `14px` at the default scale of `1rem` = `16px`.
 14    ///
 15    /// Note: The absolute size of this text will change based on a user's `ui_scale` setting.
 16    #[default]
 17    Default,
 18    /// The large size for UI text.
 19    ///
 20    /// `1rem` or `16px` at the default scale of `1rem` = `16px`.
 21    ///
 22    /// Note: The absolute size of this text will change based on a user's `ui_scale` setting.
 23    Large,
 24
 25    /// The small size for UI text.
 26    ///
 27    /// `0.75rem` or `12px` at the default scale of `1rem` = `16px`.
 28    ///
 29    /// Note: The absolute size of this text will change based on a user's `ui_scale` setting.
 30    Small,
 31
 32    /// The extra small size for UI text.
 33    ///
 34    /// `0.625rem` or `10px` at the default scale of `1rem` = `16px`.
 35    ///
 36    /// Note: The absolute size of this text will change based on a user's `ui_scale` setting.
 37    XSmall,
 38}
 39
 40impl UiTextSize {
 41    pub fn rems(self) -> Rems {
 42        match self {
 43            Self::Large => rems_from_px(16.),
 44            Self::Default => rems_from_px(14.),
 45            Self::Small => rems_from_px(12.),
 46            Self::XSmall => rems_from_px(10.),
 47        }
 48    }
 49}
 50
 51/// The size of a [`Headline`] element
 52#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Default)]
 53pub enum HeadlineSize {
 54    XSmall,
 55    Small,
 56    #[default]
 57    Medium,
 58    Large,
 59    XLarge,
 60}
 61
 62impl HeadlineSize {
 63    pub fn size(self) -> Rems {
 64        match self {
 65            // Based on the Major Second scale
 66            Self::XSmall => rems(0.88),
 67            Self::Small => rems(1.0),
 68            Self::Medium => rems(1.125),
 69            Self::Large => rems(1.27),
 70            Self::XLarge => rems(1.43),
 71        }
 72    }
 73
 74    pub fn line_height(self) -> Rems {
 75        match self {
 76            Self::XSmall => rems(1.6),
 77            Self::Small => rems(1.6),
 78            Self::Medium => rems(1.6),
 79            Self::Large => rems(1.6),
 80            Self::XLarge => rems(1.6),
 81        }
 82    }
 83}
 84
 85#[derive(IntoElement)]
 86pub struct Headline {
 87    size: HeadlineSize,
 88    text: SharedString,
 89}
 90
 91impl RenderOnce for Headline {
 92    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
 93        let ui_font = ThemeSettings::get_global(cx).ui_font.family.clone();
 94
 95        div()
 96            .font_family(ui_font)
 97            .line_height(self.size.line_height())
 98            .text_size(self.size.size())
 99            .text_color(cx.theme().colors().text)
100            .child(self.text)
101    }
102}
103
104impl Headline {
105    pub fn new(text: impl Into<SharedString>) -> Self {
106        Self {
107            size: HeadlineSize::default(),
108            text: text.into(),
109        }
110    }
111
112    pub fn size(mut self, size: HeadlineSize) -> Self {
113        self.size = size;
114        self
115    }
116}