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