| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /// Helper method for creating callbacks methods with a weak reference. |
| /// |
| /// Example: |
| /// ``` |
| /// final JavascriptChannelRegistry javascriptChannelRegistry = ... |
| /// |
| /// final WKScriptMessageHandler handler = WKScriptMessageHandler( |
| /// didReceiveScriptMessage: withWeakReferenceTo( |
| /// javascriptChannelRegistry, |
| /// (WeakReference<JavascriptChannelRegistry> weakReference) { |
| /// return ( |
| /// WKUserContentController userContentController, |
| /// WKScriptMessage message, |
| /// ) { |
| /// weakReference.target?.onJavascriptChannelMessage( |
| /// message.name, |
| /// message.body!.toString(), |
| /// ); |
| /// }; |
| /// }, |
| /// ), |
| /// ); |
| /// ``` |
| S withWeakReferenceTo<T extends Object, S extends Object>( |
| T reference, |
| S Function(WeakReference<T> weakReference) onCreate, |
| ) { |
| final WeakReference<T> weakReference = WeakReference<T>(reference); |
| return onCreate(weakReference); |
| } |
