(转)续 WebBrowser 的扩展

上次写了WebBrowser这个容器( 详细参看:http://blog.youkuaiyun.com/norsd/archive/2008/09/13/2921389.aspx)

今天来说说如何在 WebBrowser的基础上扩展更多的功能.

WebBrowserEx : public WebBrowser , public IDocHostUIHandler

1.实现 IDocHostUIHandler接口

WebBrowserEx 继承了WebBrowser ,并且加入了IDocHostUIHandler, 该接口可以个性化WB控件, 同样的必须事先实现IDocHostUIHandle

WebBrowserEx .h 部分

1. //IDocHostUIHandler
2. virtualHRESULTSTDMETHODCALLTYPEShowContextMenu(
3. DWORDdwID,
4. POINT*ppt,
5. IUnknown*pcmdtReserved,
6. IDispatch*pdispReserved);
7. virtualHRESULTSTDMETHODCALLTYPEGetHostInfo(
8. DOCHOSTUIINFO*pInfo);
9. virtualHRESULTSTDMETHODCALLTYPEShowUI(
10. DWORDdwID,
11. IOleInPlaceActiveObject*pActiveObject,
12. IOleCommandTarget*pCommandTarget,
13. IOleInPlaceFrame*pFrame,
14. IOleInPlaceUIWindow*pDoc);
15. virtualHRESULTSTDMETHODCALLTYPEHideUI(void);
16. virtualHRESULTSTDMETHODCALLTYPEUpdateUI(void);
17. //IOleInPlaceFrame已经包含了这个方法 , IOleInPlaceFrame接口在WebBrowser中实现,所以不必要再次实现
18. //virtualHRESULTSTDMETHODCALLTYPEEnableModeless(
19. //BOOLfEnable);
20. virtualHRESULTSTDMETHODCALLTYPEOnDocWindowActivate(
21. BOOLfActivate);
22. virtualHRESULTSTDMETHODCALLTYPEOnFrameWindowActivate(
23. BOOLfActivate);
24. virtualHRESULTSTDMETHODCALLTYPEResizeBorder(
25. LPCRECTprcBorder,
26. IOleInPlaceUIWindow*pUIWindow,
27. BOOLfRameWindow);
28. virtualHRESULTSTDMETHODCALLTYPETranslateAccelerator(
29. LPMSGlpMsg,
30. constGUID*pguidCmdGroup,
31. DWORDnCmdID);
32. virtualHRESULTSTDMETHODCALLTYPEGetOptionKeyPath(
33. LPOLESTR*pchKey,
34. DWORDdw);
35. virtualHRESULTSTDMETHODCALLTYPEGetDropTarget(
36. IDropTarget*pDropTarget,
37. IDropTarget**ppDropTarget);
38. virtualHRESULTSTDMETHODCALLTYPEGetExternal(
39. IDispatch**ppDispatch);
40. virtualHRESULTSTDMETHODCALLTYPETranslateUrl(
41. DWORDdwTranslate,
42. OLECHAR*pchURLIn,
43. OLECHAR**ppchURLOut);
44. virtualHRESULTSTDMETHODCALLTYPEFilterDataObject(
45. IDataObject*pDO,
46. IDataObject**ppDORet);

WebBrowserEx.cpp 部分

1. /*
2. =====================
3. |IDocHostUIHandler|
4. =====================
5. */
6. HRESULTWebBrowser::ShowContextMenu(
7. DWORDdwID,
8. POINT*ppt,
9. IUnknown*pcmdtReserved,
10. IDispatch*pdispReserved){returnE_NOTIMPL;}
12. HRESULTWebBrowser::GetHostInfo(
13. DOCHOSTUIINFO*pInfo){returnE_NOTIMPL;}
15. HRESULTWebBrowser::ShowUI(
16. DWORDdwID,
17. IOleInPlaceActiveObject*pActiveObject,
18. IOleCommandTarget*pCommandTarget,
19. IOleInPlaceFrame*pFrame,
20. IOleInPlaceUIWindow*pDoc){returnE_NOTIMPL;}
22. HRESULTWebBrowser::HideUI(void){returnE_NOTIMPL;}
24. HRESULTWebBrowser::UpdateUI(void){returnE_NOTIMPL;}
26. //HRESULTWebBrowser::EnableModeless(
27. //BOOLfEnable){returnE_NOTIMPL;}
29. HRESULTWebBrowser::OnDocWindowActivate(
30. BOOLfActivate){returnE_NOTIMPL;}
32. HRESULTWebBrowser::OnFrameWindowActivate(
33. BOOLfActivate){returnE_NOTIMPL;}
35. HRESULTWebBrowser::ResizeBorder(
36. LPCRECTprcBorder,
37. IOleInPlaceUIWindow*pUIWindow,
38. BOOLfRameWindow){returnE_NOTIMPL;}
40. HRESULTWebBrowser::TranslateAccelerator(
41. LPMSGlpMsg,
42. constGUID*pguidCmdGroup,
43. DWORDnCmdID){returnE_NOTIMPL;}
45. HRESULTWebBrowser::GetOptionKeyPath(
46. LPOLESTR*pchKey,
47. DWORDdw){returnE_NOTIMPL;}
49. HRESULTWebBrowser::GetDropTarget(
50. IDropTarget*pDropTarget,
51. IDropTarget**ppDropTarget)
52. {
53. returnE_NOTIMPL;//使用默认拖拽
54. //returnS_OK;//自定义拖拽
55. }
57. HRESULTWebBrowser::GetExternal(IDispatch**ppDispatch)
58. {
59. returnE_NOTIMPL;
60. }
62. HRESULTWebBrowser::TranslateUrl(
63. DWORDdwTranslate,
64. OLECHAR*pchURLIn,
65. OLECHAR**ppchURLOut){returnE_NOTIMPL;}
67. HRESULTWebBrowser::FilterDataObject(
68. IDataObject*pDO,
69. IDataObject**ppDORet){returnE_NOTIMPL;}

关于如何个性化IDocHostUIHandler 可以看这个: http://www.vckbase.com/document/viewdoc/?id=1486

很多人在那篇提问如何在SDK的模式下支持 IDocHostUIHandler, 我的这篇文章就是一个答案了, 你会慢慢爱上SDK的.

2.拖拽的处理

那篇文章: http://www.vckbase.com/document/viewdoc/?id=1486中由于是MFC的实现, 对于SDK实现来说缺少了一点东西,

您可以查看这篇文章: http://blog.youkuaiyun.com/norsd/archive/2008/09/01/2858556.aspx

3.处理HTML的众多Event

在MFC的 HTMLDialog 中, 可以实现诸如 MouseMove 之类的消息, 让我们用SDK实现之.

下面实现了一个简单的事件onmousemove

WebBrowserEx.h 部分:

1. virtualSTDMETHODIMP_(void)DocumentComplete(IDispatch*pDisp,VARIANT*URL);//其实是:virtualvoid__stdcallDocumentComplete(...)

WebBrowserEx.cpp部分

1. void
2. WebBrowserEx::DocumentComplete(IDispatch*pDisp,VARIANT*URL)
3. {
4. // 装载Event响应函数
5. IHTMLDocument3*pHtmlDoc3=GetHTMLDocument3();
6. BSTRbsMouseMoveEvent=::SysAllocString(L"onmousemove");
7. pHtmlDoc3->attachEvent(
8. bsMouseMoveEvent,
9. CHtmlEvents::CreateEventObject((EVENT_FUNCTION)WebBrowserEx::OnHtmlMouseMove,0,this));
10. ::SysFreeString(bsMouseMoveEvent);
11. // 注意在卸载的时候要调用detachEvent
12. WebBrowser::DocumentComplete( pDisp, URL );// 掉哦那个基类
13. return;
14. }

关于 CHtmlEvents 这是一个独立的类, CreateEventObject 返回一个IDispatch的实例, 来响应 onmousemove.

其实现类似于MSDN中的相关类.

HtmlEvents.h

1. //EVENT_FUNCTION函数指针定义被应用于:CreateEventObject;
2. typedefHRESULT(*EVENT_FUNCTION)(LPVOID);
3. classCHtmlEvents:
4. publicIDispatch
5. {
6. public:
7. CHtmlEvents();
8. virtual~CHtmlEvents(void);
10. //IUnknownmethods
11. virtualSTDMETHODIMPQueryInterface(REFIIDiid,void**ppvObject);
12. virtualSTDMETHODIMP_(ULONG)AddRef();
13. virtualSTDMETHODIMP_(ULONG)Release();
15. //IDispatchMethods
16. HRESULT_stdcallGetTypeInfoCount(unsignedint*pctinfo);
17. HRESULT_stdcallGetTypeInfo(unsignedintiTInfo,LCIDlcid,ITypeInfoFAR*FAR*ppTInfo);
18. HRESULT_stdcallGetIDsOfNames(REFIIDriid,OLECHARFAR*FAR*rgszNames,unsignedintcNames,LCIDlcid,DISPIDFAR*rgDispId);
19. HRESULT_stdcallInvoke(DISPIDdispIdMember,REFIIDriid,LCIDlcid,WORDwFlags,DISPPARAMSFAR*pDispParams,VARIANTFAR*pVarResult,EXCEPINFOFAR*pExcepInfo,unsignedintFAR*puArgErr);
21. //OtherMethod
22. staticLPDISPATCHCreateEventObject(EVENT_FUNCTIONpFunc,DISPIDid,LPVOIDlpUserData);
23. private:
24. long_lRef;
25. EVENT_FUNCTION_fnEvent;
26. DISPID_id;
27. LPVOID_pUserData;
28. };

HtmlEvents.cpp

1. #include"HtmlEvents.h"
4. //CHtmlEventsclass
5. CHtmlEvents::CHtmlEvents()
6. {
7. }
9. CHtmlEvents::~CHtmlEvents()
10. {
11. }
13. /*
14. ==================
15. |IUnknownmethods|
16. ==================
17. */
18. STDMETHODIMPCHtmlEvents::QueryInterface(REFIIDiid,void**ppvObject)
19. {
20. if(iid==IID_IUnknown||iid==IID_IDispatch)
21. {
22. *ppvObject=this;
23. AddRef();
24. returnS_OK;
25. }
26. returnE_NOTIMPL;
27. }
29. STDMETHODIMP_(ULONG)CHtmlEvents::AddRef()
30. {
31. returnInterlockedIncrement(&_lRef);
32. }
34. STDMETHODIMP_(ULONG)CHtmlEvents::Release()
35. {
36. return::InterlockedDecrement(&_lRef);
37. }
39. /*
40. =====================
41. |IDispatchMethods|
42. =====================
43. */
44. HRESULT_stdcallCHtmlEvents::GetTypeInfoCount(
45. unsignedint*pctinfo)
46. {
47. returnE_NOTIMPL;
48. }
50. HRESULT_stdcallCHtmlEvents::GetTypeInfo(
51. unsignedintiTInfo,
52. LCIDlcid,
53. ITypeInfoFAR*FAR*ppTInfo)
54. {
55. returnE_NOTIMPL;
56. }
58. HRESULT_stdcallCHtmlEvents::GetIDsOfNames(REFIIDriid,
59. OLECHARFAR*FAR*rgszNames,
60. unsignedintcNames,
61. LCIDlcid,
62. DISPIDFAR*rgDispId
63. )
64. {
65. returnE_NOTIMPL;
66. }
67. HRESULT_stdcallCHtmlEvents::Invoke(
68. DISPIDdispIdMember,
69. REFIIDriid,
70. LCIDlcid,
71. WORDwFlags,
72. DISPPARAMS*pDispParams,
73. VARIANT*pVarResult,
74. EXCEPINFO*pExcepInfo,
75. unsignedint*puArgErr)
76. {
77. if(DISPID_VALUE==dispIdMember)
78. {
79. (_fnEvent)(_pUserData);
80. returnS_OK;
81. }
82. returnE_NOTIMPL;
83. }
86. //返回一个CHtmlEvents的实例
87. //pFunc表示当相关消息发生时,CHtmlEvents的实例调用pFunc这个函数,同时参数是lpUserData,MSDN上有相关实现.
88. //他的注销可以通过Detach后delete
89. //或者Release()自动销毁,这里我们用了Detach后delete
90. LPDISPATCHCHtmlEvents::CreateEventObject(EVENT_FUNCTIONpFunc,DISPIDid,LPVOIDlpUserData)
91. {
92. CHtmlEvents*npHE=newCHtmlEvents;
93. npHE->_fnEvent=pFunc;
94. npHE->_id=id;
95. npHE->_pUserData=lpUserData;
96. returnreinterpret_cast<LPDISPATCH>(npHE);
97. };

还有一些诸如window.external 接口的实现因为已经有人说的很详细了,所以不再谈论了.

转自：http://blog.youkuaiyun.com/norsd/article/details/2934253