Merge pull request #8 from TeemuSuoranta/master

Add filter to create admin notice in shadow

README.md

@@ -51,3 +51,12 @@ Use the "WPIS-" -prefix followed by the name of your instance to name the consta
 Use the hash part of your container name to define the constant value. If the name of
 your container is "asdasd_123", use "123" to define the value.
 
+## Filters
+
+You can insert your own admin notice for users that are in shadow
+```php
+function my_shadow_admin_notice($admin_notice, $current_screen) {
+  return '<div class="notice notice-error"><p>This is staging. All content edited here will be lost. Return to production to create or edit content.</p></div>';
+}
+add_filter( 'wpp_instance_switcher_admin_notice', 'my_shadow_admin_notice', 10, 2 );
+```

wp-palvelu-instance-switcher.php

@@ -63,6 +63,7 @@ protected function __construct(){
       add_action('admin_footer', array( $this, 'render_shadow_indicator' ) );
       add_action('wp_footer', array( $this, 'render_shadow_indicator' ) );
       add_action('login_footer', array( $this, 'render_shadow_indicator' ) );
+      add_action('admin_notices', array( $this, 'render_shadow_admin_notice' ) );
     }
   }
 
@@ -179,6 +180,17 @@ public function render_shadow_indicator() {
 <?php
   }
 
+  /**
+   * Let plugins or themes display admin notice when inside a shadow
+   */
+  public function render_shadow_admin_notice( $current_screen ) {
+    $current_screen = get_current_screen();
+    $admin_notice_content = apply_filters( 'wpp_instance_switcher_admin_notice', '', $current_screen );
+    if(!empty($admin_notice_content)) {
+      echo $admin_notice_content;
+    }
+  }
+
   /**
    * Load our textdomain
    */