WordPress plugin that gives to users of WP 3.6 chance to change wysiwyg editor height by setting options in the user profile page. Two options: one for desktops, one for mobile.

GMCustomEditorHeight.php

<?php
/**
 * Plugin Name: GM Custom Editor Height
 *
 * Description: Gives to users of WP 3.6 chance to change wysiwyg editor height by setting options in the user profile page. Two options: one for desktops, one for mobile
 * Version: 0.1.0
 * Author: Giuseppe Mazzapica
 * Requires at least: 3.6
 * Tested up to: 3.6
 *
 *
 * @package GMCustomEditorHeight
 * @author Giuseppe Mazzapica
 *
 */

/**
 * GMCustomEditorHeight class
 *
 * @package GMCustomEditorHeight
 * @author Giuseppe Mazzapica
 *
 */ 
class GMCustomEditorHeight {

	/**
	* Plugin version
	*
	* @since	0.1.0
	*
	* @access	protected
	*
	* @var	string
	*/
	protected static $version = '0.1.0';	
	
	
	/**
	 * If the class was inited or not
	 *
	 * @since	0.1.0
	 *
	 * @access	protected
	 *
	 * @var	bool|null
	 */
	private static $inited = NULL;
	
	
	
	/**
	 * The current logged in user
	 *
	 * @since	0.1.0
	 *
	 * @access	private
	 *
	 * @var	object|null
	*/
	private static $user = NULL;
	
	
	
	/**
	 * Inizializize the class
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @return	null
	 *
	 */
	public static function init() {
		if( self::$inited == NULL ) {
			self::$inited = 1;
			self::actions();
		}
	}
	
	
	
	/**
	 * Add the hoock for plugin class methods
	 *
	 * @since	0.1.0
	 *
	 * @access	private
	 * @return	null
	 *
	 */
	private static function actions() {
		add_action( 'admin_init', array( __CLASS__ , 'who') );
		add_action( 'admin_init', array( __CLASS__ , 'set_filter') );
		add_action( 'show_user_profile', array( __CLASS__ , 'fields') );
		add_action( 'edit_user_profile', array( __CLASS__ , 'fields') );
		add_action( 'personal_options_update', array( __CLASS__ , 'save_fields') );
		add_action( 'edit_user_profile_update', array( __CLASS__ , 'save_fields') );
	}
	
	
	
	/**
	 * Set the filter for the_editor hook if in the post creation/editing page. Fired by admin_init action
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @return	null
	 *
	 */
	public static function set_filter() {
		global $pagenow;
		if ( $pagenow == 'post-new.php' || $pagenow == 'post.php' )
			add_filter('the_editor', array( __CLASS__, 'change_height' ), 20, 1);
	}
	
	
	
	/**
	 * Store the current user in a static variable. Fired by admin_init action
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @return	null
	 *
	 */
	public static function who() {
		self::$user = wp_get_current_user();
	}
	
	
	
	
	/**
	 * Change the height of the editor  according to settings and wp_is_mobile. Fired by the_editor filter
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @param	string	$html	the html for the editor container as passed by the_editor filter
	 * @return	string	$html	the html for the editor container
	 *
	 */
	public static function change_height( $html ) {
		if ( is_null(self::$user) ) return $html;
		if ( ! substr_count($html, 'id="wp-content') ) return $html;
		$key = wp_is_mobile() ? 'custom_editor_height_mobile' : 'custom_editor_height';
		$height = get_user_meta( self::$user->ID, $key, true ) ? : '360px';
		$height = apply_filters('gm_custom_editor_height', $height, $key, self::$user); 
		if ( ! self::check_height($height) ) $height = '360px';
		return preg_replace('/height: [0-9]+px/', 'height: ' . $height, $html, 1);
	}
	
	
	
	
	/**
	 * Print the html for the profile fields. Used by fields method
	 *
	 * @since	0.1.0
	 *
	 * @access	private
	 * @param	bool	$for_mobile	if true print the field for mobile devices otpion
	 * @return	null
	 *
	 */
	private static function fields_tr( $for_mobile = false ) {
		if ( is_null(self::$user) ) return;
		$value_f = $for_mobile ? 'custom_editor_height_value_mobile' : 'custom_editor_height_value';
		$value_u = $for_mobile ? 'custom_editor_height_unit_mobile' : 'custom_editor_height_unit';
		$key = $for_mobile ? 'custom_editor_height_mobile' : 'custom_editor_height';
		$now = get_user_meta( self::$user->ID, $key, true ) ? : "360px"; // 360 is default height
		$height = substr($now, 0, -2);
		$unit  = substr($now, (strlen($now)-2 ));
		$label = $for_mobile ?  __('Editor Height for Mobile') :  __('Editor Height');
		printf( '<tr><th><label for="%s">%s</label></th>', $value_f, $label );
		printf( '<td><input type="text" name="%s" id="%s" value="%d" class="small-text" />', $value_f, $value_f, $height );
		printf( '<select name="%s" id="%s">', $value_u, $value_u);
		foreach ( array('px','em') as $u ) echo '<option value="' . $u . '"' . selected($u, $unit, false) . '>' . $u . '</option>';
		echo '</select> <span class="description">' . __('Max 5000px or 70em') . '</span><td></tr>';
	}
	
	
	
	/**
	 * Print the html for the profile fields. Use by fields_tr method. Fired by show_user_profile and edit_user_profile actions
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @return	null
	 *
	 */
	public static function fields() {
		if ( is_null(self::$user) ) return;
		echo '<table class="form-table">';
		self::fields_tr();
		self::fields_tr(true);
		echo '</table>';
	}
	
	
	
	/**
	 * Save the fields to user metadata. Fired by personal_options_update and edit_user_profile_update actions
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @param	int	$user_id	current user id
	 * @return	null
	 *
	 */
	public static function save_fields( $user_id ) {
		if (
			isset($_POST['custom_editor_height_value']) && isset($_POST['custom_editor_height_unit']) &&
			self::check_height('', $_POST['custom_editor_height_value'], $_POST['custom_editor_height_unit'] ) )
		{
			$height = intval($_POST['custom_editor_height_value']) . $_POST['custom_editor_height_unit'];
			update_user_meta($user_id, 'custom_editor_height', $height);
		}
		if (
			isset($_POST['custom_editor_height_value_mobile']) && isset($_POST['custom_editor_height_unit_mobile']) && 
			self::check_height('', $_POST['custom_editor_height_value_mobile'], $_POST['custom_editor_height_unit_mobile'] ) )
		{
			$height = intval($_POST['custom_editor_height_value_mobile']) . $_POST['custom_editor_height_unit_mobile'];
			update_user_meta($user_id, 'custom_editor_height_mobile', $height);
		}
	}
	
	
	
	
	/**
	 * Check the value to saved for user mta is well formatted.
	 *
	 * @since	0.1.0
	 *
	 * @access	public
	 * @param	string	$full	the full meta value like '360px'
	 * @param	int|string	$value	the numeric part of meta value like '360'
	 * @param	string	$unit	the unit part of meta value like 'px'
	 * @return	null
	 *
	 */
	private static function check_height( $full, $value = null, $unit= null ) {
		if ( ! empty($full) || (  ! empty($value) && ! empty($value)) ) {
			if ( ! empty($full) ) {
				$value = substr($full, 0, -2);
				$unit  = substr($full, (strlen($full)-2 ));
			}
			return ( intval($value) && in_array( $unit, array('px','em') ) );
		}
		return false;
	}

}


/**
 * Inizialize plugin
 *
 * @since	0.1.0
 *
 * @access	public
 * @return	null
 *
 */
function initGMCustomEditorHeight() {
	GMCustomEditorHeight::init();
}
add_action('init', 'initGMCustomEditorHeight');