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:
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