function image_example_style_form_submit

Form Builder; Display a form for uploading an image.

Related topics

File

image_example/image_example.pages.inc, line 79

Code

function image_example_style_form_submit($form, &$form_state) {
    // When using the #managed_file form element the file is automatically
    // uploaded an saved to the {file} table. The value of the corresponding
    // form element is set to the {file}.fid of the new file.
    //
    // If fid is not 0 we have a valid file.
    if ($form_state['values']['image_example_image_fid'] != 0) {
        // The new file's status is set to 0 or temporary and in order to ensure
        // that the file is not removed after 6 hours we need to change it's status
        // to 1. Save the ID of the uploaded image for later use.
        $file = file_load($form_state['values']['image_example_image_fid']);
        $file->status = FILE_STATUS_PERMANENT;
        file_save($file);
        // When a module is managing a file, it must manage the usage count.
        // Here we increment the usage count with file_usage_add().
        file_usage_add($file, 'image_example', 'sample_image', 1);
        // Save the fid of the file so that the module can reference it later.
        variable_set('image_example_image_fid', $file->fid);
        drupal_set_message(t('The image @image_name was uploaded and saved with an ID of @fid and will be displayed using the style @style.', array(
            '@image_name' => $file->filename,
            '@fid' => $file->fid,
            '@style' => $form_state['values']['image_example_style_name'],
        )));
    }
    elseif ($form_state['values']['image_example_image_fid'] == 0) {
        // Retrieve the old file's id.
        $fid = variable_get('image_example_image_fid', FALSE);
        $file = $fid ? file_load($fid) : FALSE;
        if ($file) {
            // When a module is managing a file, it must manage the usage count.
            // Here we decrement the usage count with file_usage_delete().
            file_usage_delete($file, 'image_example', 'sample_image', 1);
            // The file_delete() function takes a file object and checks to see if
            // the file is being used by any other modules. If it is the delete
            // operation is cancelled, otherwise the file is deleted.
            file_delete($file);
        }
        // Either way the module needs to update it's reference since even if the
        // file is in use by another module and not deleted we no longer want to
        // use it.
        variable_set('image_example_image_fid', FALSE);
        drupal_set_message(t('The image @image_name was removed.', array(
            '@image_name' => $file->filename,
        )));
    }
    // Save the name of the image style chosen by the user.
    variable_set('image_example_style_name', $form_state['values']['image_example_style_name']);
}