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