function charts_pre_render_element in Charts 7.2

Main #pre_render callback to expand a chart element.

1 string reference to 'charts_pre_render_element'

charts_element_info in ./charts.module

Implements hook_element_info().

File

./charts.module, line 198

Provides elements for rendering charts and Views integration.

Code

function charts_pre_render_element($element) {
  $charts_info = charts_info();
  $chart_library = isset($element['#chart_library']) ? $element['#chart_library'] : NULL;

  // Use the first charting library if the requested library is not available.
  if (isset($chart_library) && isset($charts_info[$chart_library])) {
    $chart_library_info = $charts_info[$chart_library];
  }
  else {
    $chart_library = key($charts_info);
    $chart_library_info = $charts_info[$chart_library];
  }
  if (!isset($chart_library_info)) {
    $element['#type'] = 'markup';
    $element['#markup'] = t('No charting library found. Enable a charting module such as Google Charts or Highcharts.');
    return $element;
  }

  // Ensure there's an x and y axis to provide defaults.
  $chart_type = chart_get_type($element['#chart_type']);
  if ($chart_type['axis'] === CHARTS_DUAL_AXIS) {
    foreach (element_children($element) as $key) {
      $children_types[] = $element[$key]['#type'];
    }
    if (!in_array('chart_xaxis', $children_types)) {
      $element['xaxis'] = array(
        '#type' => 'chart_xaxis',
      );
    }
    if (!in_array('chart_yaxis', $children_types)) {
      $element['yaxis'] = array(
        '#type' => 'chart_yaxis',
      );
    }
  }

  // Convert integer properties to save library modules the hassle.
  charts_cast_element_integer_values($element);

  // Generic theme function assuming it will be suitable for most chart types.
  $element['#theme'] = 'charts_chart';

  // Allow the chart to be altered.
  $alter_hooks = array(
    'chart',
  );
  if ($element['#chart_id']) {
    $alter_hooks[] = 'chart_' . $element['#chart_id'];
  }
  drupal_alter($alter_hooks, $element, $element['#chart_id']);

  // Include the library specific file and render via their callback.
  if (isset($chart_library_info['file'])) {
    $module_path = drupal_get_path('module', $chart_library_info['module']);
    include_once $module_path . '/' . $chart_library_info['file'];
  }
  $callback = $chart_library_info['render'];
  $element = $callback($element);
  if (!empty($element['#chart_definition'])) {
    $chart_definition = $element['#chart_definition'];
    unset($element['#chart_definition']);

    // Allow the chart definition to be altered.
    $alter_hooks = array(
      'chart_definition',
    );
    if ($element['#chart_id']) {
      $alter_hooks[] = 'chart_definition_' . $element['#chart_id'];
    }
    drupal_alter($alter_hooks, $chart_definition, $element, $element['#chart_id']);

    // Set the element #chart_json property as a data-attribute.
    $element['#attributes']['data-chart'] = drupal_json_encode($chart_definition);
  }
  return $element;
}