Add HLS color sliders

app.py

@@ -1,10 +1,12 @@
-import re
+import colorsys
 from typing import NamedTuple
 
 import streamlit as st
 
 import fragments
 
+import util
+
 class ThemeColor(NamedTuple):
     primaryColor: str
     backgroundColor: str
@@ -69,10 +71,10 @@ def on_preset_color_selected():
 st.selectbox("Preset colors", key="preset_color", options=range(len(preset_colors)), format_func=lambda idx: preset_colors[idx][0], on_change=on_preset_color_selected)
 
 
-primary_color = st.color_picker('Primary color', key="primaryColor")
-text_color = st.color_picker('Text color', key="textColor")
-background_color = st.color_picker('Background color', key="backgroundColor")
-secondary_background_color = st.color_picker('Secondary background color', key="secondaryBackgroundColor")
+primary_color = fragments.color_picker('Primary color', key="primaryColor", default_color=default_color.primaryColor)
+text_color = fragments.color_picker('Text color', key="textColor", default_color=default_color.textColor)
+background_color = fragments.color_picker('Background color', key="backgroundColor", default_color=default_color.backgroundColor)
+secondary_background_color = fragments.color_picker('Secondary background color', key="secondaryBackgroundColor", default_color=default_color.secondaryBackgroundColor)
 
 
 def parse_hex(rgb_hex_str: str) -> tuple[float, float, float]:

fragments.py

@@ -1,9 +1,39 @@
+import colorsys
+
 import streamlit as st
 import wcag_contrast_ratio as contrast
 
 import util
 
 
+def color_picker(label: str, key: str, default_color: str) -> None:
+    def on_color_change():
+        rgb = util.parse_hex(st.session_state[key])
+        hls = colorsys.rgb_to_hls(rgb[0], rgb[1], rgb[2])
+        st.session_state[f"{key}H"] = round(hls[0] * 360)
+        st.session_state[f"{key}L"] = round(hls[1] * 100)
+        st.session_state[f"{key}S"] = round(hls[2] * 100)
+
+    def on_hls_change():
+        h = st.session_state[f"{key}H"]
+        l = st.session_state[f"{key}L"]
+        s = st.session_state[f"{key}S"]
+        r, g, b = colorsys.hls_to_rgb(h / 360, l / 100, s / 100)
+        st.session_state[key] = f"#{round(r * 255):02x}{round(g * 255):02x}{round(b * 255):02x}"
+
+    col1, col2 = st.columns([1, 3])
+    with col1:
+        color = st.color_picker(label, key=key, on_change=on_color_change)
+    with col2:
+        r,g,b = util.parse_hex(default_color)
+        h,l,s = colorsys.rgb_to_hls(r,g,b)
+        st.slider(f"H for {label}", key=f"{key}H", min_value=0, max_value=360, value=round(h * 360), format="%d°", label_visibility="collapsed", on_change=on_hls_change)
+        st.slider(f"L for {label}", key=f"{key}L", min_value=0, max_value=100, value=round(l * 100), format="%d%%", label_visibility="collapsed", on_change=on_hls_change)
+        st.slider(f"S for {label}", key=f"{key}S", min_value=0, max_value=100, value=round(s * 100), format="%d%%", label_visibility="collapsed", on_change=on_hls_change)
+
+    return color
+
+
 def contrast_summary(label: str, foreground_rgb_hex: str, background_rgb_hex: str) -> None:
     rgb_foreground = util.parse_hex(foreground_rgb_hex)
     rgb_background = util.parse_hex(background_rgb_hex)