themeswitcher.plugin.php

<?php

/**
 * ThemeSwitcher - Allows visitors to change the theme of the site.
 *
 * Usage: http://domain.com/?theme_dir=themedir or
 *        add <?php $theme->switcher(); ?> somewere.
 *
 *
 */

class ThemeSwitcher extends Plugin
{
	// True if template was shown, false otherwise
	private $shown= false;
	
	function action_init()
	{
		if ( !empty($_GET['theme_dir'] ) || !empty( $_POST['theme_dir'] ) ) {
			$new_theme_dir= empty( $_GET['theme_dir'] ) ? $_POST['theme_dir'] : $_GET['theme_dir'];
			$all_themes= Themes::get_all();
			if ( array_key_exists( $new_theme_dir, $all_themes ) ) {			
				if ( !isset($_COOKIE['theme_dir'] ) || ( isset($_COOKIE['theme_dir'] ) && ( $_COOKIE['theme_dir'] != $new_theme_dir ) ) ) {				
					$_COOKIE['theme_dir'] = $new_theme_dir; // Without this, the cookie isn't get in time to change the theme NOW.
					setcookie( 'theme_dir', $new_theme_dir );
				}
			}
		}
		
		$this->add_template( 'switcher', dirname( __FILE__ ) . '/themeswitcher.php' );
	}
	
	
	/**
	 * Sets default to always show themeswitcher in footer if not using $theme->swithcer();
	 **/

	public function action_plugin_activation( $file )
	{
		if(Plugins::id_from_file($file) == Plugins::id_from_file(__FILE__)) {
			if ( Options::get( 'themeswitcher__show' ) == null ) {
				Options::set( 'themeswitcher__show', 1 );
			}
			
		}
	}
	
	/**
	 * Call $theme->switcher() in your theme to display the template where you want.
	 */
	function theme_switcher( $theme ) {
		if (!$this->shown) {
			$this->shown= true;
			return $theme->fetch('switcher');
		}
	}
	
	/**
	 * Failsafe, if $theme->switcher() was not called, display the template in the footer.
	 * If you enabled it.
	 */
	function theme_footer( $theme ) {
		if (!$this->shown && Options::get( 'themeswitcher__show')) {			
			$this->shown= true;
			return $theme->fetch('switcher');
		}
	}
	
	function filter_option_get_value($value, $name)
	{
		if (($name == 'theme_dir') && isset($_COOKIE['theme_dir'])) {
			return $_COOKIE['theme_dir'];
		}
		else {
			return $value;
		}
	}

	
	/**
	 * Add our menu to the FormUI for plugins.
	 *
	 * @param array $actions Array of menu items for this plugin.
	 * @param string $plugin_id A unique plugin ID, it needs to match ours.
	 * @return array Original array with our added menu.
	 */
	public function filter_plugin_config( $actions, $plugin_id ) {
		if ( $plugin_id == $this->plugin_id ) { 
			$actions[] = 'Configure';
		}
		
		return $actions;
	}
	
	/**
	 * Handle calls from FormUI actions.
	 * Show the form to manage the plugin's options.
	 *
	 * @param string $plugin_id A unique plugin ID, it needs to match ours.
	 * @param string $action The menu item the user clicked.
	 */
	public function action_plugin_ui( $plugin_id, $action ) {
		if ( $plugin_id == $this->plugin_id ) {
			switch ( $action ) {
				case 'Configure':
					$themes = array_keys( Themes::get_all_data() );
					$themes = array_combine( $themes, $themes );
					$ui = new FormUI( 'themeswitcher' );
					$ts_s = $ui->append( 'select', 'selected_themes', 'themeswitcher__selected_themes', 'Select themes to offer:' );
					$ts_s->multiple= true;
					$ts_s->options =$themes;
					$ts_y = $ui->append( 'select', 'show', 'themeswitcher__show', 
						_t('If not showing with $theme->switcher() always show in footer: ') );
					$ts_y->options = array( '0' => _t('No'), '1' => _t('Yes') );
					$ui->append( 'submit', 'save', 'Save' );
					$ui->out();
					break;
			}
		}
	}
	
	/**
	 * Fail-safe method to force options to be saved in Habari's options table.
	 *
	 * @return bool Return true to force options to be saved in Habari's options table.
	 */
	public function save_options( $ui ) {
		return true;
	}
}

?>