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DockPanel与GeckoFX、ChrominumFX、CefSharp结合使用问题

时间:2017-06-24 18:43:51      阅读:358      评论:0      收藏:0      [点我收藏+]

标签:har   ntc   pat   for   add   state   构造   动态   思路   

在使用DockPanel与ChrominumFx时,当在以下条件下拖动窗体时,会发生ChromiumWebBrowser崩溃的情况,此种情况也会在DockPanel与GeckoFX或CefSharp结合使用时出现。

出现条件:

  1. 当Form表单初始时以DockState.Document,然后拖动此表单到非DockState.Document模式时,可以是DockState.Left、DockState.Right或其他。
  2. 当Form表单初始时以非DockState.Document时,然后拖动此表单到DockState.Document模式时

条件总结:即DockState.Document与其他模式切换时,会出现浏览器控件崩溃的情况。

出现此问题原因是DockPanel动态改变了Form表单的MdiParent,严格来说,并不是DockPanel的问题,如果直接使用Winform的MDI窗口模式,只要改变Form表单的MdiParent,也会导致浏览器控件崩溃。

为什么出现这个原因,目前并未深入分析,主要是也不知道从哪里开始分析,因为只是使用GeckoFX、ChrominumFX、CefSharp第三方浏览器控件才会出现此问题,而.NET 自带的WebBrowser没有此问题。

解决办法:

修改DockPanel部分源码,核心思路是在设置MdiParent之前,把浏览器控件从Form表单移除,设置之后,再把浏览器控件加入Form表单。

修改源码地方(修改的DockPanel版本是:2.13):

 

在DockContentHandler.CS类中 1053行之后,增加如下代码:

 1 private static readonly object MdiParentChangingEvent = new object();
 2         /// <summary>
 3         /// 开始设置MdiParent之前事件
 4         /// </summary>
 5         public event EventHandler MdiParentChanging
 6         {
 7             add { Events.AddHandler(MdiParentChangingEvent, value); }
 8             remove { Events.RemoveHandler(MdiParentChangingEvent, value); }
 9         }
10         protected virtual void OnMdiParentChanging(EventArgs e)
11         {
12             EventHandler handler = (EventHandler)Events[MdiParentChangingEvent];
13             if (handler != null)
14                 handler(this, e);
15         }
16 
17         private static readonly object MdiParentChangedEvent = new object();
18         /// <summary>
19         /// 设置MdiParent之后的事件
20         /// </summary>
21         public event EventHandler MdiParentChanged
22         {
23             add { Events.AddHandler(MdiParentChangedEvent, value); }
24             remove { Events.RemoveHandler(MdiParentChangedEvent, value); }
25         }
26         protected virtual void OnMdiParentChanged(EventArgs e)
27         {
28             EventHandler handler = (EventHandler)Events[MdiParentChangedEvent];
29             if (handler != null)
30                 handler(this, e);
31         }

修改 DockContentHandler.CS类 785行的SetPane方法

 1 private void SetPane(DockPane pane)
 2         {
 3             if (pane != null && pane.DockState == DockState.Document && DockPanel.DocumentStyle == DocumentStyle.DockingMdi)
 4             {
 5                 if (Form.Parent is DockPane)
 6                     SetParent(null);
 7                 if (Form.MdiParent != DockPanel.ParentForm)
 8                 {
 9                     FlagClipWindow = true;
10                     OnMdiParentChanging(EventArgs.Empty);
11                     // The content form should inherit the font of the dock panel, not the font of
12                     // the dock panel‘s parent form. However, the content form‘s font value should
13                     // not be overwritten if it has been explicitly set to a non-default value.
14                     if (PatchController.EnableFontInheritanceFix == true && Form.Font == Control.DefaultFont)
15                     {
16                        
17                         Form.MdiParent = DockPanel.ParentForm;
18                         //Form.MdiParent = null;
19                         Form.Font = DockPanel.Font;
20                     }
21                     else
22                     {
23                         Form.MdiParent = DockPanel.ParentForm;
24                         //Form.MdiParent = null;
25                     }
26                     OnMdiParentChanged(EventArgs.Empty);
27                 }
28             }
29             else
30             {
31                 FlagClipWindow = true;
32                 if (Form.MdiParent != null)
33                 {
34                     OnMdiParentChanging(EventArgs.Empty);
35                     Form.MdiParent = null;
36                     OnMdiParentChanged(EventArgs.Empty);
37                 }
38                 if (Form.TopLevel)
39                     Form.TopLevel = false;
40                 SetParent(pane);
41             }
42         }

 

修改DockContent.CS类,在317行以后增加:

 1  private static readonly object MdiParentChangingEvent = new object();
 2         /// <summary>
 3         /// 开始设置MdiParent之前事件
 4         /// </summary>
 5         public event EventHandler MdiParentChanging
 6         {
 7             add { Events.AddHandler(MdiParentChangingEvent, value); }
 8             remove { Events.RemoveHandler(MdiParentChangingEvent, value); }
 9         }
10         protected virtual void OnMdiParentChanging(EventArgs e)
11         {
12             EventHandler handler = (EventHandler)Events[MdiParentChangingEvent];
13             if (handler != null)
14                 handler(this, e);
15         }
16 
17         private static readonly object MdiParentChangedEvent = new object();
18         /// <summary>
19         /// 设置MdiParent之后的事件
20         /// </summary>
21         public event EventHandler MdiParentChanged
22         {
23             add { Events.AddHandler(MdiParentChangedEvent, value); }
24             remove { Events.RemoveHandler(MdiParentChangedEvent, value); }
25         }
26         protected virtual void OnMdiParentChanged(EventArgs e)
27         {
28             EventHandler handler = (EventHandler)Events[MdiParentChangedEvent];
29             if (handler != null)
30                 handler(this, e);
31         }
32 
33         private void DockHandler_MdiParentChanging(object sender, EventArgs e)
34         {
35             OnMdiParentChanging(e);
36         }
37         private void DockHandler_MdiParentChanged(object sender, EventArgs e)
38         {
39             OnMdiParentChanged(e);
40         }

在 DockContent.CS类 14 行以后增加:

1  m_dockHandler.MdiParentChanging += new EventHandler(DockHandler_MdiParentChanging);
2  m_dockHandler.MdiParentChanged += new EventHandler(DockHandler_MdiParentChanged);

 

最后,在你的Form表单构造函数那里增加:

this.MdiParentChanging += (o, e) => {
    this.Controls.Remove(this.MainWebBrowser);
};
this.MdiParentChanged += (o, e) => {
    this.Controls.Add(this.MainWebBrowser);
};

 

至此,可解决浏览器控件崩溃问题。

DockPanel与GeckoFX、ChrominumFX、CefSharp结合使用问题

标签:har   ntc   pat   for   add   state   构造   动态   思路   

原文地址:http://www.cnblogs.com/lyyxjc/p/7073853.html

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