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Mozilla/mozilla/widget/src/windows/nsDragService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mike Pinkerton (pinkerton@netscape.com)
* Mark Hammond (MarkH@ActiveState.com)
* David Gardiner <david.gardiner@unisa.edu.au>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <ole2.h>
#include <oleidl.h>
#include <shlobj.h>
// shellapi.h is needed to build with WIN32_LEAN_AND_MEAN
#include <shellapi.h>
#include "nsDragService.h"
#include "nsITransferable.h"
#include "nsDataObj.h"
#include "nsWidgetsCID.h"
#include "nsNativeDragTarget.h"
#include "nsNativeDragSource.h"
#include "nsClipboard.h"
#include "nsISupportsArray.h"
#include "nsIDocument.h"
#include "nsDataObjCollection.h"
#include "nsAutoPtr.h"
//-------------------------------------------------------------------------
//
// DragService constructor
//
//-------------------------------------------------------------------------
nsDragService::nsDragService()
: mNativeDragSrc(nsnull), mNativeDragTarget(nsnull), mDataObject(nsnull)
{
}
//-------------------------------------------------------------------------
//
// DragService destructor
//
//-------------------------------------------------------------------------
nsDragService::~nsDragService()
{
NS_IF_RELEASE(mNativeDragSrc);
NS_IF_RELEASE(mNativeDragTarget);
NS_IF_RELEASE(mDataObject);
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
nsISupportsArray *anArrayTransferables,
nsIScriptableRegion *aRegion,
PRUint32 aActionType)
{
nsBaseDragService::InvokeDragSession(aDOMNode, anArrayTransferables, aRegion,
aActionType);
nsresult rv;
// Try and get source URI of the items that are being dragged
nsIURI *uri = nsnull;
nsCOMPtr<nsIDocument> doc(do_QueryInterface(mSourceDocument));
if (doc) {
uri = doc->GetDocumentURI();
}
PRUint32 numItemsToDrag = 0;
rv = anArrayTransferables->Count(&numItemsToDrag);
if (!numItemsToDrag)
return NS_ERROR_FAILURE;
// The clipboard class contains some static utility methods that we
// can use to create an IDataObject from the transferable
// if we're dragging more than one item, we need to create a
// "collection" object to fake out the OS. This collection contains
// one |IDataObject| for each transerable. If there is just the one
// (most cases), only pass around the native |IDataObject|.
nsRefPtr<IDataObject> itemToDrag;
if (numItemsToDrag > 1) {
nsDataObjCollection * dataObjCollection = new nsDataObjCollection();
if (!dataObjCollection)
return NS_ERROR_OUT_OF_MEMORY;
itemToDrag = dataObjCollection;
for (PRUint32 i=0; i<numItemsToDrag; ++i) {
nsCOMPtr<nsISupports> supports;
anArrayTransferables->GetElementAt(i, getter_AddRefs(supports));
nsCOMPtr<nsITransferable> trans(do_QueryInterface(supports));
if (trans) {
nsRefPtr<IDataObject> dataObj;
rv = nsClipboard::CreateNativeDataObject(trans,
getter_AddRefs(dataObj), uri);
NS_ENSURE_SUCCESS(rv, rv);
dataObjCollection->AddDataObject(dataObj);
}
}
} // if dragging multiple items
else {
nsCOMPtr<nsISupports> supports;
anArrayTransferables->GetElementAt(0, getter_AddRefs(supports));
nsCOMPtr<nsITransferable> trans(do_QueryInterface(supports));
if (trans) {
rv = nsClipboard::CreateNativeDataObject(trans,
getter_AddRefs(itemToDrag),
uri);
NS_ENSURE_SUCCESS(rv, rv);
}
} // else dragging a single object
return StartInvokingDragSession(itemToDrag, aActionType);
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::StartInvokingDragSession(IDataObject * aDataObj,
PRUint32 aActionType)
{
// To do the drag we need to create an object that
// implements the IDataObject interface (for OLE)
NS_IF_RELEASE(mNativeDragSrc);
mNativeDragSrc = (IDropSource *)new nsNativeDragSource();
if (!mNativeDragSrc)
return NS_ERROR_OUT_OF_MEMORY;
mNativeDragSrc->AddRef();
// Now figure out what the native drag effect should be
DWORD dropRes;
DWORD effects = DROPEFFECT_SCROLL;
if (aActionType & DRAGDROP_ACTION_COPY) {
effects |= DROPEFFECT_COPY;
}
if (aActionType & DRAGDROP_ACTION_MOVE) {
effects |= DROPEFFECT_MOVE;
}
if (aActionType & DRAGDROP_ACTION_LINK) {
effects |= DROPEFFECT_LINK;
}
// XXX not sure why we bother to cache this, it can change during
// the drag
mDragAction = aActionType;
mDoingDrag = PR_TRUE;
// Start dragging
StartDragSession();
// Call the native D&D method
HRESULT res = ::DoDragDrop(aDataObj, mNativeDragSrc, effects, &dropRes);
// We're done dragging
EndDragSession();
// For some drag/drop interactions, IDataObject::SetData doesn't get
// called with a CFSTR_PERFORMEDDROPEFFECT format and the
// intermediate file (if it was created) isn't deleted. See
// http://bugzilla.mozilla.org/show_bug.cgi?id=203847#c4 for a
// detailed description of the different cases. Now that we know
// that the drag/drop operation has ended, call SetData() so that
// the intermediate file is deleted.
static CLIPFORMAT PerformedDropEffect =
::RegisterClipboardFormat(CFSTR_PERFORMEDDROPEFFECT);
FORMATETC fmte =
{
(CLIPFORMAT)PerformedDropEffect,
NULL,
DVASPECT_CONTENT,
-1,
TYMED_NULL
};
STGMEDIUM medium;
medium.tymed = TYMED_NULL;
medium.pUnkForRelease = NULL;
aDataObj->SetData(&fmte, &medium, FALSE);
mDoingDrag = PR_FALSE;
return DRAGDROP_S_DROP == res ? NS_OK : NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
// Make Sure we have the right kind of object
nsDataObjCollection*
nsDragService::GetDataObjCollection(IDataObject* aDataObj)
{
nsDataObjCollection * dataObjCol = nsnull;
if (aDataObj) {
nsIDataObjCollection* dataObj;
if (aDataObj->QueryInterface(IID_IDataObjCollection,
(void**)&dataObj) == S_OK) {
dataObjCol = NS_STATIC_CAST(nsDataObjCollection*, aDataObj);
dataObj->Release();
}
}
return dataObjCol;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::GetNumDropItems(PRUint32 * aNumItems)
{
if (!mDataObject) {
*aNumItems = 0;
return NS_OK;
}
if (IsCollectionObject(mDataObject)) {
nsDataObjCollection * dataObjCol = GetDataObjCollection(mDataObject);
if (dataObjCol)
*aNumItems = dataObjCol->GetNumDataObjects();
}
else {
// Next check if we have a file drop. Return the number of files in
// the file drop as the number of items we have, pretending like we
// actually have > 1 drag item.
FORMATETC fe2;
SET_FORMATETC(fe2, CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
if (mDataObject->QueryGetData(&fe2) == S_OK) {
STGMEDIUM stm;
if (mDataObject->GetData(&fe2, &stm) == S_OK) {
HDROP hdrop = (HDROP)GlobalLock(stm.hGlobal);
*aNumItems = ::DragQueryFile(hdrop, 0xFFFFFFFF, NULL, 0);
::GlobalUnlock(stm.hGlobal);
::ReleaseStgMedium(&stm);
}
}
else
*aNumItems = 1;
}
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::GetData(nsITransferable * aTransferable, PRUint32 anItem)
{
// This typcially happens on a drop, the target would be asking
// for it's transferable to be filled in
// Use a static clipboard utility method for this
if (!mDataObject)
return NS_ERROR_FAILURE;
nsresult dataFound = NS_ERROR_FAILURE;
if (IsCollectionObject(mDataObject)) {
// multiple items, use |anItem| as an index into our collection
nsDataObjCollection * dataObjCol = GetDataObjCollection(mDataObject);
PRUint32 cnt = dataObjCol->GetNumDataObjects();
if (anItem >= 0 && anItem < cnt) {
IDataObject * dataObj = dataObjCol->GetDataObjectAt(anItem);
dataFound = nsClipboard::GetDataFromDataObject(dataObj, 0, nsnull,
aTransferable);
}
else
NS_WARNING("Index out of range!");
}
else {
// If they are asking for item "0", we can just get it...
if (anItem == 0) {
dataFound = nsClipboard::GetDataFromDataObject(mDataObject, anItem,
nsnull, aTransferable);
} else {
// It better be a file drop, or else non-zero indexes are invalid!
FORMATETC fe2;
SET_FORMATETC(fe2, CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
if (mDataObject->QueryGetData(&fe2) == S_OK)
dataFound = nsClipboard::GetDataFromDataObject(mDataObject, anItem,
nsnull, aTransferable);
else
NS_WARNING("Reqesting non-zero index, but clipboard data is not a collection!");
}
}
return dataFound;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsDragService::SetIDataObject(IDataObject * aDataObj)
{
// When the native drag starts the DragService gets
// the IDataObject that is being dragged
NS_IF_RELEASE(mDataObject);
mDataObject = aDataObj;
NS_IF_ADDREF(mDataObject);
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::IsDataFlavorSupported(const char *aDataFlavor, PRBool *_retval)
{
if (!aDataFlavor || !mDataObject || !_retval)
return NS_ERROR_FAILURE;
#ifdef NS_DEBUG
if (strcmp(aDataFlavor, kTextMime) == 0)
NS_WARNING("DO NOT USE THE text/plain DATA FLAVOR ANY MORE. USE text/unicode INSTEAD");
#endif
*_retval = PR_FALSE;
FORMATETC fe;
UINT format = 0;
if (IsCollectionObject(mDataObject)) {
// We know we have one of our special collection objects.
format = nsClipboard::GetFormat(aDataFlavor);
SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1,
TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
// See if any one of the IDataObjects in the collection supports
// this data type
nsDataObjCollection* dataObjCol = GetDataObjCollection(mDataObject);
if (dataObjCol) {
PRUint32 cnt = dataObjCol->GetNumDataObjects();
for (PRUint32 i=0;i<cnt;++i) {
IDataObject * dataObj = dataObjCol->GetDataObjectAt(i);
if (S_OK == dataObj->QueryGetData(&fe))
*_retval = PR_TRUE; // found it!
}
}
} // if special collection object
else {
// Ok, so we have a single object. Check to see if has the correct
// data type. Since this can come from an outside app, we also
// need to see if we need to perform text->unicode conversion if
// the client asked for unicode and it wasn't available.
format = nsClipboard::GetFormat(aDataFlavor);
SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1,
TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
if (mDataObject->QueryGetData(&fe) == S_OK)
*_retval = PR_TRUE; // found it!
else {
// We haven't found the exact flavor the client asked for, but
// maybe we can still find it from something else that's on the
// clipboard
if (strcmp(aDataFlavor, kUnicodeMime) == 0) {
// client asked for unicode and it wasn't present, check if we
// have CF_TEXT. We'll handle the actual data substitution in
// the data object.
format = nsClipboard::GetFormat(kTextMime);
SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1,
TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
if (mDataObject->QueryGetData(&fe) == S_OK)
*_retval = PR_TRUE; // found it!
}
else if (strcmp(aDataFlavor, kURLMime) == 0) {
// client asked for a url and it wasn't present, but if we
// have a file, then we have a URL to give them (the path, or
// the internal URL if an InternetShortcut).
format = nsClipboard::GetFormat(kFileMime);
SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1,
TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
if (mDataObject->QueryGetData(&fe) == S_OK)
*_retval = PR_TRUE; // found it!
}
} // else try again
}
return NS_OK;
}
//
// IsCollectionObject
//
// Determine if this is a single |IDataObject| or one of our private
// collection objects. We know the difference because our collection
// object will respond to supporting the private |MULTI_MIME| format.
//
PRBool
nsDragService::IsCollectionObject(IDataObject* inDataObj)
{
PRBool isCollection = PR_FALSE;
// setup the format object to ask for the MULTI_MIME format. We only
// need to do this once
static UINT sFormat = 0;
static FORMATETC sFE;
if (!sFormat) {
sFormat = nsClipboard::GetFormat(MULTI_MIME);
SET_FORMATETC(sFE, sFormat, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
}
// ask the object if it supports it. If yes, we have a collection
// object
if (inDataObj->QueryGetData(&sFE) == S_OK)
isCollection = PR_TRUE;
return isCollection;
} // IsCollectionObject
//
// EndDragSession
//
// Override the default to make sure that we release the data object
// when the drag ends. It seems that OLE doesn't like to let apps quit
// w/out crashing when we're still holding onto their data
//
NS_IMETHODIMP
nsDragService::EndDragSession()
{
nsBaseDragService::EndDragSession();
NS_IF_RELEASE(mDataObject);
return NS_OK;
}
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