root/plugins/themeswitcher/trunk/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 info
     * Returns information about this plugin
     * @return array Plugin info array
     **/
    function info()
    {
        return array (
            'name' => 'ThemeSwitcher',
            'url' => 'http://habariproject.org/',
            'author' => 'Habari Community',
            'authorurl' => 'http://habariproject.org/',
            'version' => '1.1',
            'description' => 'Allows visitors to change the theme of the site.',
            'license' => 'Apache License 2.0',
            'copyright' => '2008'
        );
    }
    
    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;
    }
}

?>