设置外观设置文件上载的FILE_STATUS_PERMANENT

Question

在Drupal7中，我在theme settings.php中有一个主题，代码如下：

function greytheme_form_system_theme_settings_alter(&$form, $form_state)
{
    $form["greytheme_home_img"] = array(
        '#type'          => 'managed_file',
        '#title'         => t('Home Page Image'),
        '#description'   => t("Home page image to be used in the ribbon."),
        // fileID (fid) used to display the file later
        '#default_value' => variable_get('greytheme_home_img', ''), 
        '#upload_location' => 'public://homeimg/',
        '#upload_validators' => array(
            'file_validate_extensions' => array("png jpg jpeg gif"),
        ),
    );
}

这将允许我上传和验证这个主题的外观设置管理屏幕上的图像。

该文件将按预期写入文件系统。但是，文件上载在数据库中没有被标记为FILE_STATUS_PERMANENT，这会导致它稍后被cronjob清除。如何“捕捉”这个文件上传的结果，以便设置FILE_STATUS_PERMANENT并获取managed_file对象的fid？我有一种感觉，它与system_theme_settings_submit()有关，但我不确定要覆盖什么。

Answer 1

您只需要向表单添加一个自定义的提交处理程序，您可以从那里获取fid：

function greytheme_form_system_theme_settings_alter(&$form, $form_state) {
  $form["greytheme_home_img"] = array(
    '#type'          => 'managed_file',
    '#title'         => t('Home Page Image'),
    '#description'   => t("Home page image to be used in the ribbon."),
    // fileID (fid) used to display the file later
    '#default_value' => variable_get('greytheme_home_img', ''), 
    '#upload_location' => 'public://homeimg/',
    '#upload_validators' => array(
        'file_validate_extensions' => array("png jpg jpeg gif"),
    ),
  );

  $form['#submit'][] = 'greytheme_system_theme_settings_form_submit';
}

function greytheme_system_theme_settings_form_submit(&$form, &$form_state) {
  $fid = $form_state['values']['greytheme_home_img'];
  $file = file_load($fid);
  $file->status = FILE_STATUS_PERMANENT;
  file_save($file);
}

Answer 2

为什么要使用variable_get('greytheme_home_img', '')？这对我不起作用，所以我使用了theme_get_setting('greytheme_home_img')