89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1993.
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//
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// File: dmsgfltr.cpp
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//
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// Contents: This tiny message filter implementation exists to prevent
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// the eating of mouse messages by applications during drag and
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// drop. The default behavior of the call control is to eat these
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// messages. And application can specify whatever behavior they
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// want with messages.
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//
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// Classes: CDragMessageFilter
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//
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// History: dd-mmm-yy Author Comment
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// 03-Apr-94 Ricksa Created
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//
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//--------------------------------------------------------------------------
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#ifndef _DMSGFLTR_H_
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#define _DMSGFLTR_H_
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//+-------------------------------------------------------------------------
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//
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// Class: CDragMessageFilter
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//
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// Purpose: Handles special message filter processing req'd by Drag
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// and Drop.
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//
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// Interface: QueryInterface - get new interface
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// AddRef - bump reference count
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// Release - dec reference count
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// HandleInComingCall - handle new RPC
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// RetryRejectedCall - whether to retry rejected
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// MessagePending - handle message during RPC
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//
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// History: dd-mmm-yy Author Comment
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// 03-Apr-94 Ricksa Created
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//
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//--------------------------------------------------------------------------
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class CDragMessageFilter : public CPrivAlloc, public IMessageFilter
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{
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public:
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CDragMessageFilter(void);
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~CDragMessageFilter(void);
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HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject);
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ULONG STDMETHODCALLTYPE AddRef(void);
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ULONG STDMETHODCALLTYPE Release(void);
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DWORD STDMETHODCALLTYPE HandleInComingCall(
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DWORD dwCallType,
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HTASK htaskCaller,
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DWORD dwTickCount,
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LPINTERFACEINFO lpInterfaceInfo);
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DWORD STDMETHODCALLTYPE RetryRejectedCall(
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HTASK htaskCallee,
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DWORD dwTickCount,
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DWORD dwRejectType);
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DWORD STDMETHODCALLTYPE MessagePending(
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HTASK htaskCallee,
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DWORD dwTickCount,
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DWORD dwPendingType);
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static HRESULT Create(IMessageFilter **pMF);
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private:
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// Previous message filter
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LPMESSAGEFILTER _lpMessageFilterPrev;
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// Reference count on our object
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LONG _crefs;
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};
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#endif // _DMSGFLTR_H_
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