oledragdropexptoolbarctrl.h

一个使用wtl写的完整的多窗口浏览器

#pragma once

#include "ExplorerToolBarCtrl.h"

template <class T>
class COleDragDrogExplorerToolBarCtrlImpl : 
	public CExplorerToolBarCtrlImpl<T>,
	public IDropTargetImpl<T>,
	public IDropSourceImpl<T>
{
public:
	DECLARE_WND_SUPERCLASS(NULL, CToolBarCtrl::GetWndClassName())
	typedef CExplorerToolBarCtrlImpl<T> baseClass;

// Data members
	bool m_bDragAccept;
	bool m_bRButtonDown;
	int m_nDraggingCmdID;
	int m_nCurrentDrop;

// Ctor
	COleDragDrogExplorerToolBarCtrlImpl(int nInsertPointMenuItemID, int nMinID, int nMaxID) 
		: baseClass(nInsertPointMenuItemID, nMinID, nMaxID),
		  m_bDragAccept(false), m_bRButtonDown(false), m_nDraggingCmdID(-1), m_nCurrentDrop(-1)
	{
	}

// Overrides
	void OnInitExplorerToolBarCtrl()
	{
		RegisterDragDrop();
	}

	void OnTermExplorerToolBarCtrl()
	{
		RevokeDragDrop();
	}

	HRESULT OnGetExplorerToolBarDataObject(int nCmdID, IDataObject** ppDataObject)
	{
		ATLASSERT(ppDataObject != NULL);
		CString strUrl = _GetPathFromCmdID(nCmdID);
		ATLASSERT(!strUrl.IsEmpty());
		MtlRemoveTrailingBackSlash(strUrl);

		HRESULT hr = CHlinkDataObject::_CreatorClass::CreateInstance(NULL, IID_IDataObject, (void**)ppDataObject);
		if (FAILED(hr)) {
			*ppDataObject = NULL;
			return E_NOTIMPL;
		}

#ifdef _ATL_DEBUG_INTERFACES
		ATLASSERT(FALSE && _T("_ATL_DEBUG_INTERFACES crashes the following\n"));
#endif

		CHlinkDataObject* pHlinkDataObject = NULL;// this is hack, no need to release
		hr = (*ppDataObject)->QueryInterface(IID_NULL, (void**)&pHlinkDataObject);
		if (SUCCEEDED(hr)) {
			pHlinkDataObject->m_arrNameAndUrl.Add(std::make_pair(CString(),strUrl));
			return S_OK;
		}

		return E_NOTIMPL;
	}

// Message map and handlers
	BEGIN_MSG_MAP(COleDragDrogExplorerToolBarCtrlImpl<T>)
		MESSAGE_HANDLER(WM_RBUTTONDOWN, OnRButtonDown)
		MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)
		CHAIN_MSG_MAP(baseClass)
	ALT_MSG_MAP(1)
		CHAIN_MSG_MAP_ALT(baseClass, 1)
	END_MSG_MAP()

	LRESULT OnLButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
	{
		POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };

		LRESULT lRet = DefWindowProc();// required

		int nCmdID = _HitTestCmdID(pt);
		if (nCmdID == -1) {
			return 0;
		}
		
		_DoDragDrop(nCmdID, pt, (UINT)wParam, true);

		return lRet;
	}

	LRESULT OnRButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
	{
		POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
		int nCmdID = _HitTestCmdID(pt);
		if (nCmdID == -1) {
			return 0;
		}
		
		_DoDragDrop(nCmdID, pt, (UINT)wParam, false);
	
		return 0;
	}


// IDropTarget
	DROPEFFECT OnDragEnter(IDataObject* pDataObject, DWORD dwKeyState, CPoint point)
	{
		m_bDragAccept = _MtlIsHlinkDataObject(pDataObject);
		if (!m_bDragAccept)
			return DROPEFFECT_NONE;

		m_bRButtonDown = ::GetAsyncKeyState(VK_RBUTTON) < 0;

		return _MtlStandardDropEffect(dwKeyState);
	}

	DROPEFFECT OnDragOver(IDataObject* pDataObject, DWORD dwKeyState, CPoint point, DROPEFFECT dropOkEffect)
	{
		if (!m_bDragAccept)
			return DROPEFFECT_NONE;

		int nID = _HitTestCmdID(point);
		if (nID != -1) {
			if (m_nCurrentDrop != nID)
				MarkButton(m_nCurrentDrop, FALSE);

			MarkButton(m_nCurrentDrop = nID, TRUE);

			if (m_nDraggingCmdID == nID)
				return DROPEFFECT_NONE;
		}
		else {
			OnDragLeave();
		}

		if (m_nDraggingCmdID != -1)
			return _MtlStandardDropEffect(dwKeyState);
		else
			return _MtlStandardDropEffect(dwKeyState) | _MtlFollowDropEffect(dropOkEffect);
	}

	DROPEFFECT OnDrop(IDataObject* pDataObject,	DROPEFFECT dropEffect, DROPEFFECT dropEffectList, CPoint point)
	{
		DROPEFFECT dropResult = DROPEFFECT_NONE;
		MarkButton(m_nCurrentDrop, FALSE);

		CString strFolder, strPath;
		_HitTest(point, strFolder, strPath);
		if (strFolder.IsEmpty() && strPath.IsEmpty())
			return DROPEFFECT_NONE;

		// first, file dropped or not
		CSimpleArray<CString> arrFiles;
		if (MtlGetDropFileName(pDataObject, arrFiles)) {

			if (m_bRButtonDown && !strPath.IsEmpty()) {
				if (MtlOnRButtonDropOpenFromApp(m_hWnd, point, strPath, arrFiles[0]))
					return dropResult;
			}

			if (m_bRButtonDown && MtlOnRButtonDrop(m_hWnd, dropEffect, point))
				return dropResult;

			if (dropEffect & DROPEFFECT_COPY) {
				if (MtlCopyFile(strFolder, arrFiles)) {
					dropResult = DROPEFFECT_COPY;
				}
			}
			else if (dropEffect & DROPEFFECT_MOVE) {

				if (MtlMoveFile(strFolder, arrFiles)) {
					dropResult = DROPEFFECT_MOVE;
				}
			}
			else if (dropEffect & DROPEFFECT_LINK) {
				dropResult = DROPEFFECT_LINK;
				MtlMakeSureTrailingBackSlash(strFolder);
				for (int i = 0; i < arrFiles.GetSize(); ++i) {
					MtlCreateShortCutFile(strFolder + MtlGetDisplayTextFromPath(arrFiles[i]) + _T("傊偺籍澳动