75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
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#pragma once
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#ifndef DD_H_INCLUDED
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#define DD_H_INCLUDED
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/*
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Classes participating in Drag-And-Drop:
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CMMCDropSource
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1. Implements IDropSource interface and the created instance of this class
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is given to OLE for d&d operation
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2. Implements static member ScDoDragDrop which creates the instance and starts d&d
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by calling OLE Api function
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CMMCDropTarget ( TiedComObject tied to CMMCViewDropTarget )
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Implements interface IDropTarget interface and the created instance of this class
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is given to OLE for d&d operation. Its instances are tied to CMMCViewDropTarget instance
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and it places the call to this class in respond to method invocations made by OLE
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CMMCViewDropTarget
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Adds d&d support to the view by creating the instance of CMMCDropTarget (TiedComObject)
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and registering it with OLE, responding to method calls made by that instance and invoking
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virtual methods on derived class to do the HitTest/Drop.
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Registration in done by invoking protected method ScRegisterAsDropTarget.
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Target is revoke on destructor.
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CAMCTreeView
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Derives from CMMCViewDropTarget. Registers after window is created.
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Implements virtual methods to HitTest / Perform the Drop.
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CAMCListView
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Derives from CMMCViewDropTarget. Registers after window is created.
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Implements virtual methods to HitTest / Perform the Drop.
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*/
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/***************************************************************************\
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*
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* CLASS: CMMCViewDropTarget
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*
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* PURPOSE: Defines common behavior for D&D-enabled view,
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* Also defines the interface for HitTest function
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*
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* USAGE: Derive your view from this class (CAMCListView and CAMCTreeView does)
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* Implement virtual methods ScDropOnTarget and RemoveDropTargetHiliting in your class
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* Add a call to ScRegisterAsDropTarget() after the window is created
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*
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\***************************************************************************/
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class CMMCViewDropTarget : public CTiedObject
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{
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protected:
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// these methods should only be used by the derived class
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// construction - destruction
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CMMCViewDropTarget();
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~CMMCViewDropTarget();
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// drop target registration
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SC ScRegisterAsDropTarget(HWND hWnd);
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public:
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// interface methods the derived class must implement
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virtual SC ScDropOnTarget(bool bHitTestOnly, IDataObject * pDataObject, CPoint pt, bool& bCopyOperation) = 0;
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virtual void RemoveDropTargetHiliting() = 0;
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// accessory used by tied com object to display the context menu
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HWND GetWindowHandle() { return m_hwndOwner; }
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private:
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// implementation helper - creates tied com object
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SC ScCreateTarget(IDropTarget **ppTarget);
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IDropTargetPtr m_spTarget; // tied com object
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HWND m_hwndOwner; // window handle of the wiew
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};
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#endif DD_H_INCLUDED
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