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gecko-dev/widget/windows/nsDragService.cpp
Birunthan Mohanathas 337d6926aa Bug 784739 - Switch from NULL to nullptr in widget/windows/ (1/3); r=ehsan 
--HG--
extra : rebase_source : 02a90b963833b2e9bf2938b32f401746730adf84
2013-10-08 14:48:02 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <ole2.h>
#include <oleidl.h>
#include <shlobj.h>
#include <shlwapi.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"
#include "nsString.h"
#include "nsEscape.h"
#include "nsISupportsPrimitives.h"
#include "nsNetUtil.h"
#include "nsIURL.h"
#include "nsCWebBrowserPersist.h"
#include "nsToolkit.h"
#include "nsCRT.h"
#include "nsDirectoryServiceDefs.h"
#include "nsUnicharUtils.h"
#include "gfxASurface.h"
#include "gfxContext.h"
#include "nsRect.h"
#include "nsMathUtils.h"
#include "gfxWindowsPlatform.h"
//-------------------------------------------------------------------------
//
// DragService constructor
//
//-------------------------------------------------------------------------
nsDragService::nsDragService()
: mDataObject(nullptr), mSentLocalDropEvent(false)
{
}
//-------------------------------------------------------------------------
//
// DragService destructor
//
//-------------------------------------------------------------------------
nsDragService::~nsDragService()
{
NS_IF_RELEASE(mDataObject);
}
bool
nsDragService::CreateDragImage(nsIDOMNode *aDOMNode,
nsIScriptableRegion *aRegion,
SHDRAGIMAGE *psdi)
{
if (!psdi)
return false;
memset(psdi, 0, sizeof(SHDRAGIMAGE));
if (!aDOMNode)
return false;
// Prepare the drag image
nsIntRect dragRect;
nsRefPtr<gfxASurface> surface;
nsPresContext* pc;
DrawDrag(aDOMNode, aRegion,
mScreenX, mScreenY,
&dragRect, getter_AddRefs(surface), &pc);
if (!surface)
return false;
uint32_t bmWidth = dragRect.width, bmHeight = dragRect.height;
if (bmWidth == 0 || bmHeight == 0)
return false;
psdi->crColorKey = CLR_NONE;
nsRefPtr<gfxImageSurface> imgSurface = new gfxImageSurface(
gfxIntSize(bmWidth, bmHeight),
gfxImageFormatARGB32);
if (!imgSurface)
return false;
nsRefPtr<gfxContext> context = new gfxContext(imgSurface);
if (!context)
return false;
context->SetOperator(gfxContext::OPERATOR_SOURCE);
context->SetSource(surface);
context->Paint();
BITMAPV5HEADER bmih;
memset((void*)&bmih, 0, sizeof(BITMAPV5HEADER));
bmih.bV5Size = sizeof(BITMAPV5HEADER);
bmih.bV5Width = bmWidth;
bmih.bV5Height = -(int32_t)bmHeight; // flip vertical
bmih.bV5Planes = 1;
bmih.bV5BitCount = 32;
bmih.bV5Compression = BI_BITFIELDS;
bmih.bV5RedMask = 0x00FF0000;
bmih.bV5GreenMask = 0x0000FF00;
bmih.bV5BlueMask = 0x000000FF;
bmih.bV5AlphaMask = 0xFF000000;
HDC hdcSrc = CreateCompatibleDC(nullptr);
void *lpBits = nullptr;
if (hdcSrc) {
psdi->hbmpDragImage =
::CreateDIBSection(hdcSrc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS,
(void**)&lpBits, nullptr, 0);
if (psdi->hbmpDragImage && lpBits) {
memcpy(lpBits,imgSurface->Data(),(bmWidth*bmHeight*4));
}
psdi->sizeDragImage.cx = bmWidth;
psdi->sizeDragImage.cy = bmHeight;
// Mouse position in center
if (mScreenX == -1 || mScreenY == -1) {
psdi->ptOffset.x = (uint32_t)((float)bmWidth/2.0f);
psdi->ptOffset.y = (uint32_t)((float)bmHeight/2.0f);
} else {
int32_t sx = mScreenX, sy = mScreenY;
ConvertToUnscaledDevPixels(pc, &sx, &sy);
psdi->ptOffset.x = sx - dragRect.x;
psdi->ptOffset.y = sy - dragRect.y;
}
DeleteDC(hdcSrc);
}
return psdi->hbmpDragImage != nullptr;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
nsISupportsArray *anArrayTransferables,
nsIScriptableRegion *aRegion,
uint32_t aActionType)
{
nsresult rv = nsBaseDragService::InvokeDragSession(aDOMNode,
anArrayTransferables,
aRegion,
aActionType);
NS_ENSURE_SUCCESS(rv, rv);
// Try and get source URI of the items that are being dragged
nsIURI *uri = nullptr;
nsCOMPtr<nsIDocument> doc(do_QueryInterface(mSourceDocument));
if (doc) {
uri = doc->GetDocumentURI();
}
uint32_t 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 transferable. 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 (uint32_t 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);
// Add the flavors to the collection object too
rv = nsClipboard::SetupNativeDataObject(trans, dataObjCollection);
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
// Create a drag image if support is available
IDragSourceHelper *pdsh;
if (SUCCEEDED(CoCreateInstance(CLSID_DragDropHelper, nullptr,
CLSCTX_INPROC_SERVER,
IID_IDragSourceHelper, (void**)&pdsh))) {
SHDRAGIMAGE sdi;
if (CreateDragImage(aDOMNode, aRegion, &sdi)) {
if (FAILED(pdsh->InitializeFromBitmap(&sdi, itemToDrag)))
DeleteObject(sdi.hbmpDragImage);
}
pdsh->Release();
}
// Kick off the native drag session
return StartInvokingDragSession(itemToDrag, aActionType);
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::StartInvokingDragSession(IDataObject * aDataObj,
uint32_t aActionType)
{
// To do the drag we need to create an object that
// implements the IDataObject interface (for OLE)
nsRefPtr<nsNativeDragSource> nativeDragSrc =
new nsNativeDragSource(mDataTransfer);
// Now figure out what the native drag effect should be
DWORD winDropRes;
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;
mSentLocalDropEvent = false;
// Start dragging
StartDragSession();
OpenDragPopup();
nsRefPtr<IAsyncOperation> pAsyncOp;
// Offer to do an async drag
if (SUCCEEDED(aDataObj->QueryInterface(IID_IAsyncOperation,
getter_AddRefs(pAsyncOp)))) {
pAsyncOp->SetAsyncMode(VARIANT_TRUE);
} else {
NS_NOTREACHED("When did our data object stop being async");
}
// Call the native D&D method
HRESULT res = ::DoDragDrop(aDataObj, nativeDragSrc, effects, &winDropRes);
// In cases where the drop operation completed outside the application, update
// the source node's nsIDOMDataTransfer dropEffect value so it is up to date.
if (!mSentLocalDropEvent) {
uint32_t dropResult;
// Order is important, since multiple flags can be returned.
if (winDropRes & DROPEFFECT_COPY)
dropResult = DRAGDROP_ACTION_COPY;
else if (winDropRes & DROPEFFECT_LINK)
dropResult = DRAGDROP_ACTION_LINK;
else if (winDropRes & DROPEFFECT_MOVE)
dropResult = DRAGDROP_ACTION_MOVE;
else
dropResult = DRAGDROP_ACTION_NONE;
if (mDataTransfer) {
if (res == DRAGDROP_S_DROP) // Success
mDataTransfer->SetDropEffectInt(dropResult);
else
mDataTransfer->SetDropEffectInt(DRAGDROP_ACTION_NONE);
}
}
mUserCancelled = nativeDragSrc->UserCancelled();
// We're done dragging, get the cursor position and end the drag
// Use GetMessagePos to get the position of the mouse at the last message
// seen by the event loop. (Bug 489729)
// Note that we must convert this from device pixels back to Windows logical
// pixels (bug 818927).
DWORD pos = ::GetMessagePos();
FLOAT dpiScale = gfxWindowsPlatform::GetPlatform()->GetDPIScale();
nsIntPoint logPos(NSToIntRound(GET_X_LPARAM(pos) / dpiScale),
NSToIntRound(GET_Y_LPARAM(pos) / dpiScale));
SetDragEndPoint(logPos);
EndDragSession(true);
mDoingDrag = 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 = nullptr;
if (aDataObj) {
nsIDataObjCollection* dataObj;
if (aDataObj->QueryInterface(IID_IDataObjCollection,
(void**)&dataObj) == S_OK) {
dataObjCol = static_cast<nsDataObjCollection*>(aDataObj);
dataObj->Release();
}
}
return dataObjCol;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::GetNumDropItems(uint32_t * aNumItems)
{
if (!mDataObject) {
*aNumItems = 0;
return NS_OK;
}
if (IsCollectionObject(mDataObject)) {
nsDataObjCollection * dataObjCol = GetDataObjCollection(mDataObject);
if (dataObjCol) {
*aNumItems = dataObjCol->GetNumDataObjects();
}
else {
// If the count cannot be determined just return 0.
// This can happen if we have collection data of type
// MULTI_MIME ("Mozilla/IDataObjectCollectionFormat") on the clipboard
// from another process but we can't obtain an IID_IDataObjCollection
// from this process.
*aNumItems = 0;
}
}
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 = ::DragQueryFileW(hdrop, 0xFFFFFFFF, nullptr, 0);
::GlobalUnlock(stm.hGlobal);
::ReleaseStgMedium(&stm);
// Data may be provided later, so assume we have 1 item
if (*aNumItems == 0)
*aNumItems = 1;
}
else
*aNumItems = 1;
}
else
*aNumItems = 1;
}
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::GetData(nsITransferable * aTransferable, uint32_t 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);
uint32_t cnt = dataObjCol->GetNumDataObjects();
if (anItem >= 0 && anItem < cnt) {
IDataObject * dataObj = dataObjCol->GetDataObjectAt(anItem);
dataFound = nsClipboard::GetDataFromDataObject(dataObj, 0, nullptr,
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,
nullptr, 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,
nullptr, 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;
}
//---------------------------------------------------------
void
nsDragService::SetDroppedLocal()
{
// Sent from the native drag handler, letting us know
// a drop occurred within the application vs. outside of it.
mSentLocalDropEvent = true;
return;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsDragService::IsDataFlavorSupported(const char *aDataFlavor, bool *_retval)
{
if (!aDataFlavor || !mDataObject || !_retval)
return NS_ERROR_FAILURE;
#ifdef DEBUG
if (strcmp(aDataFlavor, kTextMime) == 0)
NS_WARNING("DO NOT USE THE text/plain DATA FLAVOR ANY MORE. USE text/unicode INSTEAD");
#endif
*_retval = 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) {
uint32_t cnt = dataObjCol->GetNumDataObjects();
for (uint32_t i=0;i<cnt;++i) {
IDataObject * dataObj = dataObjCol->GetDataObjectAt(i);
if (S_OK == dataObj->QueryGetData(&fe))
*_retval = 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 = 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 = 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 = 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.
//
bool
nsDragService::IsCollectionObject(IDataObject* inDataObj)
{
bool isCollection = 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 = 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(bool aDoneDrag)
{
nsBaseDragService::EndDragSession(aDoneDrag);
NS_IF_RELEASE(mDataObject);
return NS_OK;
}
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