class views_handler_field_boolean

class views_handler_field_boolean extends views_handler_field {
    function option_definition() {
        $options = parent::option_definition();
        $options['type'] = array(
            'default' => 'yes-no',
        );
        $options['not'] = array(
            'definition bool' => 'reverse',
        );
        return $options;
    }
    function init(&$view, $options) {
        parent::init($view, $options);
        $default_formats = array(
            'yes-no' => array(
                t('Yes'),
                t('No'),
            ),
            'true-false' => array(
                t('True'),
                t('False'),
            ),
            'on-off' => array(
                t('On'),
                t('Off'),
            ),
            'enabled-disabled' => array(
                t('Enabled'),
                t('Disabled'),
            ),
            'unicode-yes-no' => array(
                '✔',
                '✖',
            ),
        );
        $output_formats = isset($this->definition['output formats']) ? $this->definition['output formats'] : array();
        $this->formats = array_merge($default_formats, $output_formats);
    }
    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        foreach ($this->formats as $key => $item) {
            $options[$key] = implode('/', $item);
        }
        $form['type'] = array(
            '#type' => 'select',
            '#title' => t('Output format'),
            '#options' => $options,
            '#default_value' => $this->options['type'],
        );
        $form['not'] = array(
            '#type' => 'checkbox',
            '#title' => t('Reverse'),
            '#description' => t('If checked, true will be displayed as false.'),
            '#default_value' => $this->options['not'],
        );
    }
    function render($values) {
        $value = $this->get_value($values);
        if (!empty($this->options['not'])) {
            $value = !$value;
        }
        if (isset($this->formats[$this->options['type']])) {
            return $value ? $this->formats[$this->options['type']][0] : $this->formats[$this->options['type']][1];
        }
        else {
            return $value ? $this->formats['yes-no'][0] : $this->formats['yes-no'][1];
        }
    }

}