Wikimedia Codex

A PHP library for building HTML and CSS UI components using Codex, the Wikimedia design system.

Installation

Use Composer to install the Codex library:

composer require wikimedia/codex

Construction Methodology

Codex uses the Fluent Builder Pattern to allow developers to create and configure UI components in a highly readable and intuitive manner. This pattern follows a create → build → render sequence that allows methods to progressively customize components before rendering.

How It Works

1. Create: Begin by calling a builder method to initialize a new component, for example, $codex->Accordion().
2. Configure: Chain configuration methods to customize the component's attributes, such as setTitle(), setDescription(), or setContent().
3. Render: Finally, call the build()->getHtml() method to get the rendered HTML for the component.

Example

$accordion = $codex
			->accordion()
			->setTitle( "Accordion Example" )
			->setDescription( "This is an example of an accordion." )
			->setContentHtml(
				$codex
					->htmlSnippet()
					->setContent( "<p>This is the content of the accordion.</p>" )
					->build()
			)
			->setOpen( false )
			->setAttributes( [
				"class" => "foo",
				"bar" => "baz",
			] )
			->build()
			->getHtml();

echo $accordion;

This pattern allows for a structured and clear way to build complex UI components with minimal effort, making the codebase both efficient and readable.

Available Components

The Codex library provides a variety of components to build UI:

• Accordion: A collapsible and expandable section for organizing content.
• Button: A clickable button that can be styled to reflect different actions.
• Card: A component for grouping information and actions related to a single topic.
• Checkbox: A form element that allows users to select one or more options.
• Field: A container for grouping form elements with optional legend and help a text.
• InfoChip: A small component used to display brief information or tags.
• Label: A component used to label other form elements.
• Message: A component to display information, warnings, or errors to users.
• Pager: A component for navigating through pages of data.
• ProgressBar: A visual indicator of progress toward a goal or task completion.
• Radio: A form element that allows users to select one option from a set.
• Select: A dropdown component that allows users to select an option from a list.
• Table: A component for arranging data in rows and columns.
• Tabs: A component that organizes content into multiple panels with selectable tabs.
• TextArea: A multi-line text input field for user input.
• TextInput: A single-line text input field for user input.
• Thumbnail: A visual component for displaying small preview images.
• ToggleSwitch: A ToggleSwitch enables the user to instantly toggle between on and off states.

Usage

Here is a basic example of how to use the Codex library:

<?php

require 'vendor/autoload.php';
use Wikimedia\Codex\Utility\Codex

$codex = new Codex();

$accordion = $codex
			->accordion()
			->setTitle( "Accordion Example" )
			->setDescription( "This is an example of an accordion." )
			->setContentHtml(
				$codex
					->htmlSnippet()
					->setContent( "<p>This is the content of the accordion.</p>" )
					->build()
			)
			->setOpen( false )
			->setAttributes( [
				"class" => "foo",
				"bar" => "baz",
			] )
			->build()
			->getHtml();

echo $accordion;
?>

Usage in MediaWiki

Here is a basic example of how to use the Codex library in MediaWiki:

<?php

use MediaWiki\SpecialPage\SpecialPage;
use Wikimedia\Codex\Adapter\WebRequestAdapter;
use Wikimedia\Codex\Utility\Codex;
use Wikimedia\Codex\Utility\WebRequestCallbacks;

class SomeSpecial extends SpecialPage {

	public function __construct() {
		parent::__construct( "SomeSpecial" );
	}

	public function execute( $subPage ) {
		$codex = new Codex();
		$requestAdapter = new WebRequestAdapter( $this->getRequest() );
		$callbacks = new WebRequestCallbacks( $requestAdapter );

		$tab1 = $codex
				->Tab()
				->setName( "tab1" )
				->setLabel( "Tab 1" )
				->setContentHtml(
					$codex
					->htmlSnippet()
					->setContent( "<p>Content 1.</p>" )
					->build()
				)
				->setSelected( true )
				->build();

		$tab2 = $codex
				->Tab()
				->setName( "tab2" )
				->setLabel( "Tab 2" )
				->setContentHtml(
					$codex
					->htmlSnippet()
					->setContent( "<p>Content 2.</p>" )
					->build()
				)
				->build();

		$tab3 = $codex
				->Tab()
				->setName( "tab3" )
				->setLabel( "Tab 3" )
				->setContentHtml(
					$codex
					->htmlSnippet()
					->setContent( "<p>Content 3.</p>" )
					->build()
				)
				->build();

		$tabs = $codex
				->Tabs()
				->setCallbacks( $callbacks )
				->setTab( [ $tab1, $tab2, $tab3 ] )
				->build()
				->getHtml();

		$this->getOutput()->addHTML( $tabs );
	}
}

Example Usage of WebRequestAdapter and WebRequestCallbacks

This example demonstrates how to use the WebRequestAdapter and WebRequestCallbacks classes to adapt $_GET parameters for use with the Codex library.

Create a SimpleWebRequest Class

The SimpleWebRequest class implements the IWebRequest interface from the Codex design system. It simulates a basic request object that stores $_GET parameters, providing a standardized way to retrieve these parameters in accordance with the Codex interface. This class allows for consistent access to request data, ensuring flexibility and adherence to the expected behavior of Codex components.

use Wikimedia\Codex\Contract\IWebRequest;

class SimpleWebRequest implements IWebRequest {
protected array $data;

    public function __construct( array $data ) {
        $this->data = $data;
    }

    public function getVal( string $name, $default = null ) {
        return $this->data[$name] ?? $default;
    }
}

Adapt the SimpleWebRequest for Codex

Use the WebRequestAdapter to adapt the SimpleWebRequest object, making it compatible with Codex components.

use Wikimedia\Codex\Adapter\WebRequestAdapter;

// Initialize the request with $_GET parameters
$request = new SimpleWebRequest( $_GET );

// Adapt the SimpleWebRequest to work with Codex
$requestAdapter = new WebRequestAdapter( $request );

Initialize WebRequestCallbacks

Finally, initialize the WebRequestCallbacks with the adapted request to handle request parameters consistently.

use Wikimedia\Codex\Utility\WebRequestCallbacks;

// Initialize WebRequestCallbacks
$callbacks = new WebRequestCallbacks( $requestAdapter );

With this setup, $callbacks can be used within Codex components to manage $_GET parameters consistently across the application.

Scripts

The following scripts are defined for testing and code fixing purposes:

• test: Run linting and code checks.
• fix: Automatically fix code style issues.
• phan: Run the Phan static analyzer.
• phpcs: Run the PHP Code Sniffer.
• start-sandbox: Start the sandbox environment for testing.

Example usage:

composer run-script test
composer run-script fix
composer run-script phan
composer run-script phpcs
composer run-script start-sandbox

License

This project is licensed under the GPL-2.0-or-later. See the [LICENSE](LICENSE) file for details.

Contributing

Please read the [CONTRIBUTING](CONTRIBUTING.md) file for details on our code of conduct, and the process for submitting pull requests to us.

Bugs

Report bugs at Phabricator.

Homepage

For more information, visit the homepage.