public function ColorShiftImageEffect::buildConfigurationForm in Image Effects 8

Same name and namespace in other branches

1. 8.3 src/Plugin/ImageEffect/ColorShiftImageEffect.php \Drupal\image_effects\Plugin\ImageEffect\ColorShiftImageEffect::buildConfigurationForm()
2. 8.2 src/Plugin/ImageEffect/ColorShiftImageEffect.php \Drupal\image_effects\Plugin\ImageEffect\ColorShiftImageEffect::buildConfigurationForm()

Form constructor.

Plugin forms are embedded in other forms. In order to know where the plugin form is located in the parent form, #parents and #array_parents must be known, but these are not available during the initial build phase. In order to have these properties available when building the plugin form's elements, let this method return a form element that has a #process callback and build the rest of the form in the callback. By the time the callback is executed, the element's #parents and #array_parents properties will have been set by the form API. For more documentation on #parents and #array_parents, see \Drupal\Core\Render\Element\FormElement.

Parameters

array $form: An associative array containing the initial structure of the plugin form.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form. Calling code should pass on a subform state created through \Drupal\Core\Form\SubformState::createForSubform().

Return value

array The form structure.

Overrides PluginFormInterface::buildConfigurationForm

File

src/Plugin/ImageEffect/ColorShiftImageEffect.php, line 57

Class

ColorShiftImageEffect

Shift image colors.

Namespace

Drupal\image_effects\Plugin\ImageEffect

Code

public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
  $form['RGB'] = [
    '#type' => 'image_effects_color',
    '#title' => $this
      ->t('Color shift'),
    '#description' => $this
      ->t("Note that colorshift is a mathematical filter that doesn't always have the expected result. To shift an image precisely TO a target color, desaturate (greyscale) it before colorizing. The hue (color wheel) is the <em>direction</em> the existing colors are shifted. The tone (inner box) is the amount. Keep the tone half-way up the left site of the color box for best results."),
    '#default_value' => $this->configuration['RGB'],
  ];
  return $form;
}