Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/modules/outside_in/src/Block/BlockEntityOffCanvasForm.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace Drupal\outside_in\Block;
+
+use Drupal\block\BlockForm;
+use Drupal\block\BlockInterface;
+use Drupal\Core\Block\BlockPluginInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\PluginWithFormsInterface;
+
+/**
+ * Provides form for block instance forms when used in the off-canvas tray.
+ *
+ * This form removes advanced sections of regular block form such as the
+ * visibility settings, machine ID and region.
+ */
+class BlockEntityOffCanvasForm extends BlockForm {
+
+  /**
+   * Provides a title callback to get the block's admin label.
+   *
+   * @param \Drupal\block\BlockInterface $block
+   *   The block entity.
+   *
+   * @return \Drupal\Core\StringTranslation\TranslatableMarkup
+   *   The title.
+   */
+  public function title(BlockInterface $block) {
+    // @todo Wrap "Configure " in <span class="visually-hidden"></span> once
+    //   https://www.drupal.org/node/2359901 is fixed.
+    return $this->t('Configure @block', ['@block' => $block->getPlugin()->getPluginDefinition()['admin_label']]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function form(array $form, FormStateInterface $form_state) {
+    $form = parent::form($form, $form_state);
+
+    // Create link to full block form.
+    $query = [];
+    if ($destination = $this->getRequest()->query->get('destination')) {
+      $query['destination'] = $destination;
+    }
+    $form['advanced_link'] = [
+      '#type' => 'link',
+      '#title' => $this->t('Advanced options'),
+      '#url' => $this->entity->toUrl('edit-form', ['query' => $query]),
+      '#weight' => 1000,
+    ];
+
+    // Remove the ID and region elements.
+    unset($form['id'], $form['region'], $form['settings']['admin_label']);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function actions(array $form, FormStateInterface $form_state) {
+    $actions = parent::actions($form, $form_state);
+    $actions['submit']['#value'] = $this->t('Save @block', ['@block' => $this->entity->getPlugin()->getPluginDefinition()['admin_label']]);
+    $actions['delete']['#access'] = FALSE;
+    return $actions;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function buildVisibilityInterface(array $form, FormStateInterface $form_state) {
+    // Do not display the visibility.
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function validateVisibility(array $form, FormStateInterface $form_state) {
+    // Intentionally empty.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function submitVisibility(array $form, FormStateInterface $form_state) {
+    // Intentionally empty.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getPluginForm(BlockPluginInterface $block) {
+    if ($block instanceof PluginWithFormsInterface) {
+      return $this->pluginFormFactory->createInstance($block, 'offcanvas', 'configure');
+    }
+    return $block;
+  }
+
+}