feat(env): change default druid colors

src/env.rs

@@ -1,10 +1,9 @@
 use crate::state;
-use druid::{Env, Key};
+use druid::{Color, Env, Key};
 
 pub const TIMER_INIT_DURATION: Key<f64> = Key::new("hwt.env.comp.timer.init_duration");
 pub const TIMER_DURATION: Key<f64> = Key::new("hwt.env.comp.timer.duration");
 pub const TIMER_POSTPONE_DURATION: Key<f64> = Key::new("hwt.env.comp.timer.postpone_duration");
-pub const TIMER_WAIT_DURATION: Key<f64> = Key::new("hwt.env.comp.timer.wait_duration");
 
 pub const MICRO_BREAK_TIMER_DURATION: Key<f64> = Key::new("hwt.env.widget.micro_break.duration");
 pub const MICRO_BREAK_TIMER_POSTPONE_DURATION: Key<f64> =
@@ -21,6 +20,22 @@ pub const REST_BREAK_TIMER_WAIT_DURATION: Key<f64> =
 pub const BREAK_NOTIFIER_TIMER_DURATION: Key<f64> = Key::new("hwt.env.widget.notifier.duration");
 
 pub fn configure(env: &mut Env, _data: &state::App) {
+    let col_def_white = hsl(0.0, 0.0, 1.0);
+    // let col_def_black = hsl(0.0, 0.0, 0.0);
+    let col_graphite = hsl(0.0, 0.0, 0.13);
+    let col_pale = hsl(0.0, 0.0, 0.86);
+    let col_faded = hsl(0.0, 0.0, 0.96);
+
+    // druid theme
+    env.set(druid::theme::WINDOW_BACKGROUND_COLOR, col_def_white);
+    env.set(druid::theme::BACKGROUND_DARK, col_pale.clone());
+    env.set(druid::theme::BACKGROUND_LIGHT, col_faded.clone());
+    env.set(druid::theme::BORDER_DARK, col_pale.clone());
+    env.set(druid::theme::BORDER_LIGHT, col_faded.clone());
+    env.set(druid::theme::LABEL_COLOR, col_graphite);
+    env.set(druid::theme::BUTTON_DARK, col_pale);
+    env.set(druid::theme::BUTTON_LIGHT, col_faded);
+
     env.set(MICRO_BREAK_TIMER_DURATION, 10.0);
     env.set(MICRO_BREAK_TIMER_POSTPONE_DURATION, 10.0);
     env.set(MICRO_BREAK_TIMER_WAIT_DURATION, 30.0);
@@ -35,3 +50,53 @@ pub fn configure(env: &mut Env, _data: &state::App) {
 fn mins(m: f64) -> f64 {
     return m * 60.0;
 }
+
+fn hsl(h: f64, s: f64, l: f64) -> Color {
+    hsla(h, s, l, 1.0)
+}
+
+fn hsla(h: f64, s: f64, l: f64, a: f64) -> Color {
+    let (r, g, b) = hsl_to_rgb(h, s, l);
+    Color::rgba(r, g, b, a)
+}
+
+fn hsl_to_rgb(h: f64, s: f64, l: f64) -> (f64, f64, f64) {
+    let r;
+    let g;
+    let b;
+
+    if s == 0.0 {
+        r = l;
+        g = l;
+        b = l; // achromatic
+    } else {
+        let q = if l < 0.5 { l * (1. + s) } else { l + s - l * s };
+
+        let p = 2. * l - q;
+        r = hue_to_rgb(p, q, h + 1. / 3.);
+        g = hue_to_rgb(p, q, h);
+        b = hue_to_rgb(p, q, h - 1. / 3.);
+    }
+
+    return (r, g, b);
+}
+
+fn hue_to_rgb(p: f64, q: f64, t: f64) -> f64 {
+    let mut t = t;
+    if t < 0. {
+        t += 1.
+    }
+    if t > 1. {
+        t -= 1.
+    };
+    if t < 1. / 6. {
+        return p + (q - p) * 6. * t;
+    }
+    if t < 1. / 2. {
+        return q;
+    }
+    if t < 2. / 3. {
+        return p + (q - p) * (2. / 3. - t) * 6.;
+    }
+    return p;
+}