| import re | |
| from typing import NamedTuple | |
| import streamlit as st | |
| import fragments | |
| class ThemeColor(NamedTuple): | |
| primaryColor: str | |
| backgroundColor: str | |
| secondaryBackgroundColor: str | |
| textColor: str | |
| preset_colors: list[tuple[str, ThemeColor]] = [ | |
| ("Default light", ThemeColor( | |
| primaryColor="#ff4b4b", | |
| backgroundColor="#ffffff", | |
| secondaryBackgroundColor="#f0f2f6", | |
| textColor="#31333F", | |
| )), | |
| ("Default dark", ThemeColor( | |
| primaryColor="#ff4b4b", | |
| backgroundColor="#0e1117", | |
| secondaryBackgroundColor="#262730", | |
| textColor="#fafafa", | |
| )) | |
| ] | |
| default_color = preset_colors[0][1] | |
| if 'primaryColor' not in st.session_state: | |
| st.session_state['primaryColor'] = st._config.get_option(f'theme.primaryColor') or default_color.primaryColor | |
| if 'backgroundColor' not in st.session_state: | |
| st.session_state['backgroundColor'] = st._config.get_option(f'theme.backgroundColor') or default_color.backgroundColor | |
| if 'secondaryBackgroundColor' not in st.session_state: | |
| st.session_state['secondaryBackgroundColor'] = st._config.get_option(f'theme.secondaryBackgroundColor') or default_color.secondaryBackgroundColor | |
| if 'textColor' not in st.session_state: | |
| st.session_state['textColor'] = st._config.get_option(f'theme.textColor') or default_color.textColor | |
| st.title("Streamlit color theme editor") | |
| def on_preset_color_selected(): | |
| _, color = preset_colors[st.session_state.preset_color] | |
| st.session_state['primaryColor'] = color.primaryColor | |
| st.session_state['backgroundColor'] = color.backgroundColor | |
| st.session_state['secondaryBackgroundColor'] = color.secondaryBackgroundColor | |
| st.session_state['textColor'] = color.textColor | |
| 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") | |
| def parse_hex(rgb_hex_str: str) -> tuple[float, float, float]: | |
| if not re.match(r"^#[0-9a-fA-F]{6}$", rgb_hex_str): | |
| raise ValueError("Invalid hex color") | |
| return tuple(int(rgb_hex_str[i:i+2], 16) / 255 for i in (1, 3, 5)) | |
| st.header("WCAG contrast ratio") | |
| st.markdown(""" | |
| Check if the color contrasts of the selected colors are enough to the WCAG guidelines recommendation. | |
| For the details about it, see some resources such as the [WCAG document](https://www.w3.org/WAI/WCAG21/Understanding/contrast-minimum.html) or the [MDN page](https://developer.mozilla.org/en-US/docs/Web/Accessibility/Understanding_WCAG/Perceivable/Color_contrast).""") | |
| def synced_color_picker(label: str, value: str, key: str): | |
| def on_change(): | |
| st.session_state[key] = st.session_state[key + "2"] | |
| st.color_picker(label, value=value, key=key + "2", on_change=on_change) | |
| col1, col2, col3 = st.columns(3) | |
| with col2: | |
| synced_color_picker("Background color", value=background_color, key="backgroundColor") | |
| with col3: | |
| synced_color_picker("Secondary background color", value=secondary_background_color, key="secondaryBackgroundColor") | |
| col1, col2, col3 = st.columns(3) | |
| with col1: | |
| synced_color_picker("Primary color", value=primary_color, key="primaryColor") | |
| with col2: | |
| fragments.contrast_summary("Primary/Background", primary_color, background_color) | |
| with col3: | |
| fragments.contrast_summary("Primary/Secondary background", primary_color, secondary_background_color) | |
| col1, col2, col3 = st.columns(3) | |
| with col1: | |
| synced_color_picker("Text color", value=text_color, key="textColor") | |
| with col2: | |
| fragments.contrast_summary("Text/Background", text_color, background_color) | |
| with col3: | |
| fragments.contrast_summary("Text/Secondary background", text_color, secondary_background_color) | |
| st.header("Config") | |
| st.subheader("Config file (`.streamlit/config.toml`)") | |
| st.code(f""" | |
| [theme] | |
| primaryColor="{primary_color}" | |
| backgroundColor="{background_color}" | |
| secondaryBackgroundColor="{secondary_background_color}" | |
| textColor="{text_color}" | |
| """, language="toml") | |
| st.subheader("Command line argument") | |
| st.code(f""" | |
| streamlit run app.py \\ | |
| --theme.primaryColor="{primary_color}" \\ | |
| --theme.backgroundColor="{background_color}" \\ | |
| --theme.secondaryBackgroundColor="{secondary_background_color}" \\ | |
| --theme.textColor="{text_color}" | |
| """) | |
| apply_theme = st.checkbox("Apply theme to this page") | |
| if apply_theme: | |
| def reconcile_theme_config(): | |
| keys = ['primaryColor', 'backgroundColor', 'secondaryBackgroundColor', 'textColor'] | |
| has_changed = False | |
| for key in keys: | |
| if st._config.get_option(f'theme.{key}') != st.session_state[key]: | |
| st._config.set_option(f'theme.{key}', st.session_state[key]) | |
| has_changed = True | |
| if has_changed: | |
| st.experimental_rerun() | |
| reconcile_theme_config() | |
| fragments.sample_components("body") | |
| with st.sidebar: | |
| fragments.sample_components("sidebar") | |