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HTMLDocumentEventHelper.cs
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66 lines (56 loc) · 2.24 KB
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/****************************** 模块头 ******************************\
* 模块名称: HTMLDocumentEventHelper.cs
* 项目名称: CSBrowserHelperObject
* 版权：Copyright (c) Microsoft Corporation.
*
* 这个 ComVisible 类 HTMLDocumentEventHelper是用来设置HTMLDocument的事件处理的。
* 接口 DispHTMLDocument 定义了很多事件，就像
* oncontextmenu, onclick等, 这些事件可以被设置到
* HTMLEventHandler 实例中.
*
*
* This source is subject to the Microsoft Public License.
* See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.
* All other rights reserved.
*
* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
* EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
\***************************************************************************/
using System.Runtime.InteropServices;
using mshtml;
namespace CSBrowserHelperObject
{
[ComVisible(true)]
public class HTMLDocumentEventHelper
{
private HTMLDocument document;
public HTMLDocumentEventHelper(HTMLDocument document)
{
this.document = document;
}
public event HtmlEvent oncontextmenu
{
add
{
DispHTMLDocument dispDoc = this.document as DispHTMLDocument;
object existingHandler = dispDoc.oncontextmenu;
HTMLEventHandler handler = existingHandler is HTMLEventHandler ?
existingHandler as HTMLEventHandler :
new HTMLEventHandler(this.document);
// 为 oncontextmenu 事件设置事件处理句柄.
dispDoc.oncontextmenu = handler;
handler.eventHandler += value;
}
remove
{
DispHTMLDocument dispDoc = this.document as DispHTMLDocument;
object existingHandler = dispDoc.oncontextmenu;
HTMLEventHandler handler = existingHandler is HTMLEventHandler ?
existingHandler as HTMLEventHandler : null;
if (handler != null)
handler.eventHandler -= value;
}
}
}
}