Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/app/view/admin/abstract.php

@@ -0,0 +1,76 @@
+<?php
+
+/**
+ * The abstract class for a admin page.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.View
+ */
+abstract class Ai1ec_View_Admin_Abstract extends Ai1ec_Base {
+
+    /**
+     * @var string
+     */
+    protected $_page_id;
+
+    /**
+     * @var string
+     */
+    protected $_page_suffix;
+
+    /**
+     * @var string
+     */
+    protected $_api_registration;
+
+    /**
+     * Standard constructor
+     *
+     * @param Ai1ec_Registry_Object $registry
+     */
+    public function __construct( Ai1ec_Registry_Object $registry ) {
+        parent::__construct( $registry );
+        $exploded_class          = explode( '_', get_class( $this ) );
+        $this->_page_suffix      = strtolower( end( $exploded_class ) );
+        $this->_api_registration = $this->_registry->get( 'model.api.api-registration' );
+    }
+
+    /**
+     * Get the url of the page
+     *
+     * @return string
+     */
+    public function get_url() {
+        return  add_query_arg(
+            array(
+                'post_type' => AI1EC_POST_TYPE,
+                'page'      => AI1EC_PLUGIN_NAME . '-' . $this->_page_suffix,
+            ),
+            ai1ec_admin_url( 'edit.php' )
+        );
+    }
+
+    /**
+     * Adds the page to the correct menu.
+     */
+    abstract public function add_page();
+
+    /**
+     * Adds the page to the correct menu.
+     */
+    abstract public function add_meta_box();
+
+    /**
+     * Display the page html
+     */
+    abstract public function display_page();
+
+    /**
+     * Handle post, likely to be deprecated to use commands.
+     */
+    abstract public function handle_post();
+
+}