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Add dark mode support

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Implemented dark mode across all pages, allowing users to toggle
between light and dark themes. The default theme is determined by
the operating system or browser settings. A toggle button in the
navigation bar enables users to switch themes, using sun and moon
icons from Font Awesome. User preferences are stored in cookies
and local storage to ensure consistency across sessions and pages.

The changes include:
- Added a before_request function to load theme preference from
  cookies or set a default based on user agent.
- Updated CSS to support dark mode styling.
- Modified base.html to include a theme toggle button and
  corresponding JavaScript for theme switching.

Fixes #FLAS-2
This commit is contained in:
Neo 2024-09-05 23:24:01 +00:00 • committed by Jose Palazon
parent 206f4f4d72
commit 8c57553ada
3 changed files with 59 additions and 1 deletions
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10
flaskr/__init__.py
View file

@ -1,6 +1,6 @@
import os import os
from flask import Flask from flask import Flask, request, g
def create_app(test_config=None): def create_app(test_config=None):
@ -31,6 +31,14 @@ def create_app(test_config=None):
def hello(): def hello():
return "Hello, World!" return "Hello, World!"
@app.before_request
def load_theme_preference():
theme = request.cookies.get('theme')
if theme:
g.theme = theme
else:
g.theme = 'dark' if request.user_agent.platform in ['android', 'iphone'] and request.user_agent.browser in ['chrome', 'safari'] and request.user_agent.string.find('DarkMode') != -1 else 'light'
# register the database commands # register the database commands
from . import db from . import db

22
flaskr/static/style.css
View file

@ -152,3 +152,25 @@ input[type=submit] {
input[type=submit]:hover { input[type=submit]:hover {
background-color: #2c5f8a; background-color: #2c5f8a;
} }
body.dark-mode {
background: #121212;
color: #e0e0e0;
}
body.dark-mode a {
color: #bb86fc;
}
body.dark-mode nav {
background: #333;
}
body.dark-mode .flash {
background: #333;
border-color: #bb86fc;
}
body.dark-mode .post .about {
color: #999;
}

28
flaskr/templates/base.html
View file

@ -1,9 +1,15 @@
<!doctype html> <!doctype html>
<title>{% block title %}{% endblock %} - Flaskr</title> <title>{% block title %}{% endblock %} - Flaskr</title>
<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}"> <link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
<script src="https://kit.fontawesome.com/57e33e1f60.js" crossorigin="anonymous"></script>
<nav> <nav>
<h1><a href="{{ url_for('index') }}">Flaskr</a></h1> <h1><a href="{{ url_for('index') }}">Flaskr</a></h1>
<ul> <ul>
<li>
<button id="theme-toggle" aria-label="Toggle Dark Mode">
<i id="theme-icon" class="fas"></i>
</button>
</li>
{% if g.user %} {% if g.user %}
<li><span>{{ g.user['username'] }}</span> <li><span>{{ g.user['username'] }}</span>
<li><a href="{{ url_for('auth.logout') }}">Log Out</a> <li><a href="{{ url_for('auth.logout') }}">Log Out</a>
@ -22,3 +28,25 @@
{% endfor %} {% endfor %}
{% block content %}{% endblock %} {% block content %}{% endblock %}
</section> </section>
<script>
document.addEventListener('DOMContentLoaded', function() {
const themeToggle = document.getElementById('theme-toggle');
const themeIcon = document.getElementById('theme-icon');
const currentTheme = localStorage.getItem('theme') || (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
if (currentTheme === 'dark') {
document.body.classList.add('dark-mode');
themeIcon.classList.add('fa-sun');
} else {
themeIcon.classList.add('fa-moon');
}
themeToggle.addEventListener('click', function() {
document.body.classList.toggle('dark-mode');
const newTheme = document.body.classList.contains('dark-mode') ? 'dark' : 'light';
localStorage.setItem('theme', newTheme);
themeIcon.classList.toggle('fa-sun');
themeIcon.classList.toggle('fa-moon');
});
});
</script>