Add upstream plugins

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

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

@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * The Theme selection page.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.View
+ */
+class Ai1ec_View_Admin_Theme_Switching extends Ai1ec_View_Admin_Abstract {
+
+    /* (non-PHPdoc)
+     * @see Ai1ec_View_Admin_Abstract::display_page()
+     */
+    public function display_page() {
+        global $ct;
+        // defaults
+        $activated = isset( $_GET['activated'] ) ? true : false;
+        $deleted   = false;
+
+        $_list_table = $this->_registry->get( 'theme.list' );
+        $_list_table->prepare_items();
+
+        $args = array(
+            'activated'     => $activated,
+            'deleted'       => $deleted,
+            'ct'            => $ct,
+            'wp_list_table' => $_list_table,
+            'page_title'    => Ai1ec_I18n::__(
+                'All-in-One Event Calendar: Themes'
+            ),
+        );
+
+        add_thickbox();
+        wp_enqueue_script( 'theme-preview' );
+        $loader = $this->_registry->get( 'theme.loader' );
+
+        $file   = $loader->get_file( 'themes.php', $args, true );
+        return $file->render();
+    }
+
+    /* (non-PHPdoc)
+     * @see Ai1ec_View_Admin_Abstract::add_page()
+     */
+    public function add_page() {
+        global $submenu;
+        // ===============
+        // = Themes Page =
+        // ===============
+        $themes_page = add_submenu_page(
+            AI1EC_ADMIN_BASE_URL,
+            Ai1ec_I18n::__( 'Calendar Themes' ),
+            Ai1ec_I18n::__( 'Calendar Themes' ),
+            'switch_ai1ec_themes',
+            AI1EC_PLUGIN_NAME . '-themes',
+            array( $this, 'display_page' )
+        );
+    }
+
+    public function add_meta_box() {
+    }
+
+    public function handle_post() {
+    }
+
+}