245 lines
7.7 KiB
C++
245 lines
7.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsDragService.h"
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#include "nsITransferable.h"
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#include "nsDataObj.h"
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#include "nsWidgetsCID.h"
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#include "nsNativeDragTarget.h"
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#include "nsNativeDragSource.h"
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#include "nsClipboard.h"
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#include "nsISupportsArray.h"
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#include "nsDataObjCollection.h"
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#include <OLE2.h>
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#include "OLEIDL.H"
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//-------------------------------------------------------------------------
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//
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// DragService constructor
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//
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//-------------------------------------------------------------------------
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nsDragService::nsDragService()
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{
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NS_INIT_REFCNT();
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mNativeDragTarget = nsnull;
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mNativeDragSrc = nsnull;
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mDataObject = nsnull;
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}
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//-------------------------------------------------------------------------
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//
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// DragService destructor
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//
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//-------------------------------------------------------------------------
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nsDragService::~nsDragService()
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{
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NS_IF_RELEASE(mNativeDragSrc);
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NS_IF_RELEASE(mNativeDragTarget);
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NS_IF_RELEASE(mDataObject);
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}
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//-------------------------------------------------------------------------
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NS_IMETHODIMP nsDragService::InvokeDragSession (nsISupportsArray * anArrayTransferables, nsIRegion * aRegion, PRUint32 aActionType)
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{
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nsresult rv;
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PRUint32 cnt;
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rv = anArrayTransferables->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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if (cnt == 0) {
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return NS_ERROR_FAILURE;
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}
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// The clipboard class contains some static utility methods
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// that we can use to create an IDataObject from the transferable
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nsDataObjCollection * dataObjCollection = new nsDataObjCollection();
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IDataObject * dataObj = nsnull;
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PRUint32 i;
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for (i=0;i<cnt;i++) {
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nsCOMPtr<nsISupports> supports;
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anArrayTransferables->GetElementAt(i, getter_AddRefs(supports));
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nsCOMPtr<nsITransferable> trans(do_QueryInterface(supports));
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if ( trans ) {
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nsClipboard::CreateNativeDataObject(trans, &dataObj);
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dataObjCollection->AddDataObject(dataObj);
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NS_IF_RELEASE(dataObj);
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}
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}
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StartInvokingDragSession((IDataObject *)dataObjCollection, aActionType);
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return NS_OK;
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}
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//-------------------------------------------------------------------------
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NS_IMETHODIMP nsDragService::StartInvokingDragSession(IDataObject * aDataObj, PRUint32 aActionType)
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{
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// To do the drag we need to create an object that
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// implements the IDataObject interface (for OLE)
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NS_IF_RELEASE(mNativeDragSrc);
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mNativeDragSrc = (IDropSource *)new nsNativeDragSource();
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if (nsnull != mNativeDragSrc) {
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mNativeDragSrc->AddRef();
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}
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// Now figure out what the native drag effect should be
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DWORD dropRes;
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DWORD effects = DROPEFFECT_SCROLL;
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if (aActionType & DRAGDROP_ACTION_COPY) {
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effects |= DROPEFFECT_COPY;
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}
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if (aActionType & DRAGDROP_ACTION_MOVE) {
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effects |= DROPEFFECT_MOVE;
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}
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if (aActionType & DRAGDROP_ACTION_LINK) {
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effects |= DROPEFFECT_LINK;
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}
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mDragAction = aActionType;
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mDoingDrag = PR_TRUE;
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// Call the native D&D method
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HRESULT res = ::DoDragDrop(aDataObj, mNativeDragSrc, effects, &dropRes);
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mDoingDrag = PR_FALSE;
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return (DRAGDROP_S_DROP == res?NS_OK:NS_ERROR_FAILURE);
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}
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//-------------------------------------------------------------------------
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NS_IMETHODIMP nsDragService::GetNumDropItems (PRUint32 * aNumItems)
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{
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// First check to see if the mDataObject is is Collection of IDataObjects
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UINT format = nsClipboard::GetFormat(MULTI_MIME);
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FORMATETC fe;
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SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
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if (S_OK != mDataObject->QueryGetData(&fe)) {
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*aNumItems = 1;
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return NS_OK;
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}
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// If it is the get the number of items in the collection
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nsDataObjCollection * dataObjCol = (nsDataObjCollection *)mDataObject;
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*aNumItems = (PRUint32)dataObjCol->GetNumDataObjects();
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return NS_OK;
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}
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//-------------------------------------------------------------------------
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NS_IMETHODIMP nsDragService::GetData (nsITransferable * aTransferable, PRUint32 anItem)
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{
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// This typcially happens on a drop, the target would be asking
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// for it's transferable to be filled in
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// Use a static clipboard utility method for this
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if ( nsnull == mDataObject ) {
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return NS_ERROR_FAILURE;
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}
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// First check to see if the mDataObject is is Collection of IDataObjects
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UINT format = nsClipboard::GetFormat(MULTI_MIME);
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FORMATETC fe;
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SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
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// if it is a single object then get the data for it
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if (S_OK != mDataObject->QueryGetData(&fe)) {
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// Since there is only one object, they better be asking for item "0"
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if (anItem == 0) {
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return nsClipboard::GetDataFromDataObject(mDataObject, nsnull, aTransferable);
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} else {
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return NS_ERROR_FAILURE;
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}
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}
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// If it is a collection of objects then get the data for the specified index
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nsDataObjCollection * dataObjCol = (nsDataObjCollection *)mDataObject;
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PRUint32 cnt = dataObjCol->GetNumDataObjects();
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if (anItem >= 0 && anItem < cnt) {
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IDataObject * dataObj = dataObjCol->GetDataObjectAt(anItem);
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return nsClipboard::GetDataFromDataObject(dataObj, nsnull, aTransferable);
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}
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return NS_ERROR_FAILURE;
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}
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//---------------------------------------------------------
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NS_IMETHODIMP nsDragService::SetIDataObject (IDataObject * aDataObj)
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{
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// When the native drag starts the DragService gets
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// the IDataObject that is being dragged
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NS_IF_RELEASE(mDataObject);
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mDataObject = aDataObj;
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NS_ADDREF(mDataObject);
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return NS_OK;
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}
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//-------------------------------------------------------------------------
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NS_IMETHODIMP nsDragService::IsDataFlavorSupported(const char *aDataFlavor, PRBool *_retval)
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{
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if ( !aDataFlavor || !mDataObject || !_retval )
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return NS_ERROR_FAILURE;
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// First check to see if the mDataObject is is Collection of IDataObjects
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*_retval = PR_FALSE;
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UINT format = nsClipboard::GetFormat(MULTI_MIME);
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FORMATETC fe;
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SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
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if (S_OK != mDataObject->QueryGetData(&fe)) {
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// Ok, so we have a single object
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// now check to see if has the correct data type
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format = nsClipboard::GetFormat(aDataFlavor);
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SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
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if (S_OK == mDataObject->QueryGetData(&fe))
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*_retval = PR_TRUE;;
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}
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// Set it up for the data flavor
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format = nsClipboard::GetFormat(aDataFlavor);
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SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
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// Ok, now see if any one of the IDataObjects in the collection
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// supports this data type
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nsDataObjCollection * dataObjCol = (nsDataObjCollection *)mDataObject;
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PRUint32 i;
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PRUint32 cnt = dataObjCol->GetNumDataObjects();
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for (i=0;i<cnt;i++) {
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IDataObject * dataObj = dataObjCol->GetDataObjectAt(i);
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if (S_OK == dataObj->QueryGetData(&fe))
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*_retval = PR_TRUE;
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}
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return NS_OK;
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}
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//-------------------------------------------------------------------------
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NS_IMETHODIMP nsDragService::GetCurrentSession (nsIDragSession ** aSession)
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{
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if ( !aSession )
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return NS_ERROR_FAILURE;
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*aSession = (nsIDragSession *)this;
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NS_ADDREF(*aSession);
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return NS_OK;
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}
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