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gecko-dev/editor/base/nsPlaintextDataTransfer.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
*/
#include "nsICaret.h"
#include "nsPlaintextEditor.h"
#include "nsTextEditUtils.h"
#include "nsIDOMText.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMDocument.h"
#include "nsIDOMAttr.h"
#include "nsIDocument.h"
#include "nsIDOMEventReceiver.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMKeyListener.h"
#include "nsIDOMMouseListener.h"
#include "nsIDOMMouseEvent.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsIDOMHTMLAnchorElement.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsISelectionController.h"
#include "nsIFrameSelection.h" // For TABLESELECTION_ defines
#include "nsIIndependentSelection.h" //domselections answer to frameselection
#include "nsICSSLoader.h"
#include "nsICSSStyleSheet.h"
#include "nsIHTMLContentContainer.h"
#include "nsIStyleSet.h"
#include "nsIDocumentObserver.h"
#include "nsIDocumentStateListener.h"
#include "nsIStyleContext.h"
#include "nsIEnumerator.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "nsEditorCID.h"
#include "nsLayoutCID.h"
#include "nsIDOMRange.h"
#include "nsIDOMNSRange.h"
#include "nsISupportsArray.h"
#include "nsVoidArray.h"
#include "nsFileSpec.h"
#include "nsIFile.h"
#include "nsIURL.h"
#include "nsIComponentManager.h"
#include "nsIServiceManager.h"
#include "nsWidgetsCID.h"
#include "nsIDocumentEncoder.h"
#include "nsIDOMDocumentFragment.h"
#include "nsIPresShell.h"
#include "nsIPresContext.h"
#include "nsIParser.h"
#include "nsParserCIID.h"
#include "nsIImage.h"
#include "nsAOLCiter.h"
#include "nsInternetCiter.h"
#include "nsISupportsPrimitives.h"
// netwerk
#include "nsIURI.h"
#include "nsNetUtil.h"
// Drag & Drop, Clipboard
#include "nsWidgetsCID.h"
#include "nsIClipboard.h"
#include "nsITransferable.h"
#include "nsIDragService.h"
#include "nsIDOMNSUIEvent.h"
// Misc
#include "nsEditorUtils.h"
#include "nsIPref.h"
const PRUnichar nbsp = 160;
// HACK - CID for NS_CTRANSITIONAL_DTD_CID so that we can get at transitional dtd
#define NS_CTRANSITIONAL_DTD_CID \
{ 0x4611d482, 0x960a, 0x11d4, { 0x8e, 0xb0, 0xb6, 0x17, 0x66, 0x1b, 0x6f, 0x7c } }
static NS_DEFINE_CID(kHTMLEditorCID, NS_HTMLEDITOR_CID);
static NS_DEFINE_CID(kCContentIteratorCID, NS_CONTENTITERATOR_CID);
static NS_DEFINE_IID(kSubtreeIteratorCID, NS_SUBTREEITERATOR_CID);
static NS_DEFINE_CID(kCRangeCID, NS_RANGE_CID);
static NS_DEFINE_CID(kCDOMSelectionCID, NS_DOMSELECTION_CID);
static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
static NS_DEFINE_IID(kCParserIID, NS_IPARSER_IID);
static NS_DEFINE_CID(kCParserCID, NS_PARSER_CID);
static NS_DEFINE_CID(kCTransitionalDTDCID, NS_CTRANSITIONAL_DTD_CID);
// Drag & Drop, Clipboard Support
static NS_DEFINE_CID(kCClipboardCID, NS_CLIPBOARD_CID);
static NS_DEFINE_CID(kCTransferableCID, NS_TRANSFERABLE_CID);
static NS_DEFINE_CID(kCDragServiceCID, NS_DRAGSERVICE_CID);
static NS_DEFINE_CID(kCHTMLFormatConverterCID, NS_HTMLFORMATCONVERTER_CID);
// private clipboard data flavors for html copy/paste
#define kHTMLContext "text/_moz_htmlcontext"
#define kHTMLInfo "text/_moz_htmlinfo"
#if defined(NS_DEBUG) && defined(DEBUG_buster)
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
NS_IMETHODIMP nsPlaintextEditor::PrepareTransferable(nsITransferable **transferable)
{
// Create generic Transferable for getting the data
nsresult rv = nsComponentManager::CreateInstance(kCTransferableCID, nsnull,
NS_GET_IID(nsITransferable),
(void**)transferable);
if (NS_FAILED(rv))
return rv;
// Get the nsITransferable interface for getting the data from the clipboard
if (transferable) (*transferable)->AddDataFlavor(kUnicodeMime);
return NS_OK;
}
NS_IMETHODIMP nsPlaintextEditor::InsertTextFromTransferable(nsITransferable *transferable)
{
nsresult rv = NS_OK;
char* bestFlavor = nsnull;
nsCOMPtr<nsISupports> genericDataObj;
PRUint32 len = 0;
if ( NS_SUCCEEDED(transferable->GetAnyTransferData(&bestFlavor, getter_AddRefs(genericDataObj), &len)) )
{
nsAutoTxnsConserveSelection dontSpazMySelection(this);
nsAutoString flavor, stuffToPaste;
flavor.AssignWithConversion( bestFlavor ); // just so we can use flavor.Equals()
if (flavor.EqualsWithConversion(kUnicodeMime))
{
nsCOMPtr<nsISupportsWString> textDataObj ( do_QueryInterface(genericDataObj) );
if (textDataObj && len > 0)
{
PRUnichar* text = nsnull;
textDataObj->ToString ( &text );
stuffToPaste.Assign ( text, len / 2 );
nsAutoEditBatch beginBatching(this);
rv = InsertText(stuffToPaste);
if (text)
nsMemory::Free(text);
}
}
}
nsCRT::free(bestFlavor);
// Try to scroll the selection into view if the paste/drop succeeded
if (NS_SUCCEEDED(rv))
{
nsCOMPtr<nsISelectionController> selCon;
if (NS_SUCCEEDED(GetSelectionController(getter_AddRefs(selCon))) && selCon)
selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL, nsISelectionController::SELECTION_FOCUS_REGION);
}
return rv;
}
NS_IMETHODIMP nsPlaintextEditor::InsertFromDrop(nsIDOMEvent* aDropEvent)
{
ForceCompositionEnd();
nsresult rv;
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1", &rv);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIDragSession> dragSession;
dragService->GetCurrentSession(getter_AddRefs(dragSession));
if (!dragSession) return NS_OK;
// Get the nsITransferable interface for getting the data from the drop
nsCOMPtr<nsITransferable> trans;
rv = PrepareTransferable(getter_AddRefs(trans));
if (NS_FAILED(rv)) return rv;
if (!trans) return NS_OK; // NS_ERROR_FAILURE; SHOULD WE FAIL?
PRUint32 numItems = 0;
rv = dragSession->GetNumDropItems(&numItems);
if (NS_FAILED(rv)) return rv;
// Combine any deletion and drop insertion into one transaction
nsAutoEditBatch beginBatching(this);
PRUint32 i;
PRBool doPlaceCaret = PR_TRUE;
for (i = 0; i < numItems; ++i)
{
rv = dragSession->GetData(trans, i);
if (NS_FAILED(rv)) return rv;
if (!trans) return NS_OK; // NS_ERROR_FAILURE; Should we fail?
if ( doPlaceCaret )
{
// check if the user pressed the key to force a copy rather than a move
// if we run into problems here, we'll just assume the user doesn't want a copy
PRBool userWantsCopy = PR_FALSE;
nsCOMPtr<nsIDOMNSUIEvent> nsuiEvent (do_QueryInterface(aDropEvent));
if (!nsuiEvent) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMMouseEvent> mouseEvent ( do_QueryInterface(aDropEvent) );
if (mouseEvent)
#ifdef XP_MAC
mouseEvent->GetAltKey(&userWantsCopy);
#else
mouseEvent->GetCtrlKey(&userWantsCopy);
#endif
// Source doc is null if source is *not* the current editor document
nsCOMPtr<nsIDOMDocument> srcdomdoc;
rv = dragSession->GetSourceDocument(getter_AddRefs(srcdomdoc));
if (NS_FAILED(rv)) return rv;
// Current doc is destination
nsCOMPtr<nsIDOMDocument>destdomdoc;
rv = GetDocument(getter_AddRefs(destdomdoc));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsISelection> selection;
rv = GetSelection(getter_AddRefs(selection));
if (NS_FAILED(rv)) return rv;
if (!selection) return NS_ERROR_FAILURE;
PRBool isCollapsed;
rv = selection->GetIsCollapsed(&isCollapsed);
if (NS_FAILED(rv)) return rv;
// Parent and offset under the mouse cursor
nsCOMPtr<nsIDOMNode> newSelectionParent;
PRInt32 newSelectionOffset = 0;
rv = nsuiEvent->GetRangeParent(getter_AddRefs(newSelectionParent));
if (NS_FAILED(rv)) return rv;
if (!newSelectionParent) return NS_ERROR_FAILURE;
rv = nsuiEvent->GetRangeOffset(&newSelectionOffset);
if (NS_FAILED(rv)) return rv;
/* Creating a range to store insert position because when
we delete the selection, range gravity will make sure the insertion
point is in the correct place */
nsCOMPtr<nsIDOMRange> destinationRange;
rv = CreateRange(newSelectionParent, newSelectionOffset,newSelectionParent, newSelectionOffset, getter_AddRefs(destinationRange));
if (NS_FAILED(rv))
return rv;
if(!destinationRange)
return NS_ERROR_FAILURE;
// We never have to delete if selection is already collapsed
PRBool deleteSelection = PR_FALSE;
PRBool cursorIsInSelection = PR_FALSE;
// Check if mouse is in the selection
if (!isCollapsed)
{
PRInt32 rangeCount;
rv = selection->GetRangeCount(&rangeCount);
if (NS_FAILED(rv))
return rv?rv:NS_ERROR_FAILURE;
for (PRInt32 j = 0; j < rangeCount; j++)
{
nsCOMPtr<nsIDOMRange> range;
rv = selection->GetRangeAt(j, getter_AddRefs(range));
if (NS_FAILED(rv) || !range)
continue;//dont bail yet, iterate through them all
nsCOMPtr<nsIDOMNSRange> nsrange(do_QueryInterface(range));
if (NS_FAILED(rv) || !nsrange)
continue;//dont bail yet, iterate through them all
rv = nsrange->IsPointInRange(newSelectionParent, newSelectionOffset, &cursorIsInSelection);
if(cursorIsInSelection)
break;
}
if (cursorIsInSelection)
{
// Dragging within same doc can't drop on itself -- leave!
// (We shouldn't get here - drag event shouldn't have started if over selection)
if (srcdomdoc == destdomdoc)
return NS_OK;
// Dragging from another window onto a selection
// XXX Decision made to NOT do this,
// note that 4.x does replace if dropped on
//deleteSelection = PR_TRUE;
}
else
{
// We are NOT over the selection
if (srcdomdoc == destdomdoc)
{
// Within the same doc: delete if user doesn't want to copy
deleteSelection = !userWantsCopy;
}
else
{
// Different source doc: Don't delete
deleteSelection = PR_FALSE;
}
}
}
if (deleteSelection)
{
rv = DeleteSelection(eNone);
if (NS_FAILED(rv)) return rv;
}
// If we deleted the selection because we dropped from another doc,
// then we don't have to relocate the caret (insert at the deletion point)
if (!(deleteSelection && srcdomdoc != destdomdoc))
{
// Move the selection to the point under the mouse cursor
rv = destinationRange->GetStartContainer(getter_AddRefs(newSelectionParent));
if (NS_FAILED(rv))
return rv;
if(!newSelectionParent)
return NS_ERROR_FAILURE;
rv = destinationRange->GetStartOffset(&newSelectionOffset);
if (NS_FAILED(rv))
return rv;
selection->Collapse(newSelectionParent, newSelectionOffset);
}
// We have to figure out whether to delete and relocate caret only once
doPlaceCaret = PR_FALSE;
}
rv = InsertTextFromTransferable(trans);
}
return rv;
}
NS_IMETHODIMP nsPlaintextEditor::CanDrag(nsIDOMEvent *aDragEvent, PRBool *aCanDrag)
{
if (!aCanDrag)
return NS_ERROR_NULL_POINTER;
/* we really should be checking the XY coordinates of the mouseevent and ensure that
* that particular point is actually within the selection (not just that there is a selection)
*/
*aCanDrag = PR_FALSE;
// KLUDGE to work around bug 50703
// After double click and object property editing,
// we get a spurious drag event
if (mIgnoreSpuriousDragEvent)
{
mIgnoreSpuriousDragEvent = PR_FALSE;
return NS_OK;
}
nsCOMPtr<nsISelection> selection;
nsresult res = GetSelection(getter_AddRefs(selection));
if (NS_FAILED(res)) return res;
PRBool isCollapsed;
res = selection->GetIsCollapsed(&isCollapsed);
if (NS_FAILED(res)) return res;
// if we are collapsed, we have no selection so nothing to drag
if ( isCollapsed )
return NS_OK;
nsCOMPtr<nsIDOMEventTarget> eventTarget;
res = aDragEvent->GetOriginalTarget(getter_AddRefs(eventTarget));
if (NS_FAILED(res)) return res;
if ( eventTarget )
{
nsCOMPtr<nsIDOMNode> eventTargetDomNode = do_QueryInterface(eventTarget);
if ( eventTargetDomNode )
{
PRBool amTargettedCorrectly = PR_FALSE;
res = selection->ContainsNode(eventTargetDomNode, PR_FALSE, &amTargettedCorrectly);
if (NS_FAILED(res)) return res;
*aCanDrag = amTargettedCorrectly;
}
}
return NS_OK;
}
NS_IMETHODIMP nsPlaintextEditor::DoDrag(nsIDOMEvent *aDragEvent)
{
nsresult rv;
nsCOMPtr<nsIDOMEventTarget> eventTarget;
rv = aDragEvent->GetTarget(getter_AddRefs(eventTarget));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIDOMNode> domnode = do_QueryInterface(eventTarget);
/* get the selection to be dragged */
nsCOMPtr<nsISelection> selection;
rv = GetSelection(getter_AddRefs(selection));
if (NS_FAILED(rv)) return rv;
/* create an array of transferables */
nsCOMPtr<nsISupportsArray> transferableArray;
NS_NewISupportsArray(getter_AddRefs(transferableArray));
if (transferableArray == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
/* get the drag service */
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1", &rv);
if (NS_FAILED(rv)) return rv;
/* create html flavor transferable */
nsCOMPtr<nsITransferable> trans = do_CreateInstance(kCTransferableCID);
NS_ENSURE_TRUE(trans, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMDocument> domdoc;
rv = GetDocument(getter_AddRefs(domdoc));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIDocument> doc = do_QueryInterface(domdoc);
if (doc)
{
// find out if we're a plaintext control or not
PRUint32 editorFlags = 0;
rv = GetFlags(&editorFlags);
if (NS_FAILED(rv)) return rv;
PRBool bIsPlainTextControl = ((editorFlags & eEditorPlaintextMask) != 0);
// get correct mimeType and document encoder flags set
nsAutoString mimeType;
PRUint32 docEncoderFlags = 0;
if (bIsPlainTextControl)
{
docEncoderFlags |= nsIDocumentEncoder::OutputBodyOnly | nsIDocumentEncoder::OutputPreformatted;
mimeType = NS_LITERAL_STRING(kUnicodeMime);
}
else
mimeType = NS_LITERAL_STRING(kHTMLMime);
// set up docEncoder
nsCOMPtr<nsIDocumentEncoder> docEncoder = do_CreateInstance(NS_HTMLCOPY_ENCODER_CONTRACTID);
NS_ENSURE_TRUE(docEncoder, NS_ERROR_FAILURE);
rv = docEncoder->Init(doc, mimeType, docEncoderFlags);
if (NS_FAILED(rv)) return rv;
rv = docEncoder->SetSelection(selection);
if (NS_FAILED(rv)) return rv;
// grab a string
nsAutoString buffer;
rv = docEncoder->EncodeToString(buffer);
if (NS_FAILED(rv)) return rv;
// if we have an empty string, we're done; otherwise continue
if ( !buffer.IsEmpty() )
{
nsCOMPtr<nsISupportsWString> dataWrapper = do_CreateInstance(NS_SUPPORTS_WSTRING_CONTRACTID);
NS_ENSURE_TRUE(dataWrapper, NS_ERROR_FAILURE);
rv = dataWrapper->SetData( NS_CONST_CAST(PRUnichar*, buffer.get()) );
if (NS_FAILED(rv)) return rv;
if (bIsPlainTextControl)
{
// Add the unicode flavor to the transferable
rv = trans->AddDataFlavor(kUnicodeMime);
if (NS_FAILED(rv)) return rv;
}
else
{
rv = trans->AddDataFlavor(kHTMLMime);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIFormatConverter> htmlConverter = do_CreateInstance(kCHTMLFormatConverterCID);
NS_ENSURE_TRUE(htmlConverter, NS_ERROR_FAILURE);
rv = trans->SetConverter(htmlConverter);
if (NS_FAILED(rv)) return rv;
}
// QI the data object an |nsISupports| so that when the transferable holds
// onto it, it will addref the correct interface.
nsCOMPtr<nsISupports> nsisupportsDataWrapper ( do_QueryInterface(dataWrapper) );
rv = trans->SetTransferData(bIsPlainTextControl ? kUnicodeMime : kHTMLMime,
nsisupportsDataWrapper, buffer.Length() * 2);
if (NS_FAILED(rv)) return rv;
/* add the transferable to the array */
rv = transferableArray->AppendElement(trans);
if (NS_FAILED(rv)) return rv;
/* invoke drag */
unsigned int flags;
// in some cases we'll want to cut rather than copy... hmmmmm...
flags = nsIDragService::DRAGDROP_ACTION_COPY + nsIDragService::DRAGDROP_ACTION_MOVE;
rv = dragService->InvokeDragSession( domnode, transferableArray, nsnull, flags);
if (NS_FAILED(rv)) return rv;
aDragEvent->PreventBubble();
}
}
return rv;
}
NS_IMETHODIMP nsPlaintextEditor::Paste(PRInt32 aSelectionType)
{
ForceCompositionEnd();
// Get Clipboard Service
nsresult rv;
nsCOMPtr<nsIClipboard> clipboard( do_GetService( kCClipboardCID, &rv ) );
if ( NS_FAILED(rv) )
return rv;
// Get the nsITransferable interface for getting the data from the clipboard
nsCOMPtr<nsITransferable> trans;
rv = PrepareTransferable(getter_AddRefs(trans));
if (NS_SUCCEEDED(rv) && trans)
{
// Get the Data from the clipboard
if (NS_SUCCEEDED(clipboard->GetData(trans, aSelectionType)) && IsModifiable())
{
rv = InsertTextFromTransferable(trans);
}
}
return rv;
}
NS_IMETHODIMP nsPlaintextEditor::CanPaste(PRInt32 aSelectionType, PRBool *aCanPaste)
{
if (!aCanPaste)
return NS_ERROR_NULL_POINTER;
*aCanPaste = PR_FALSE;
// can't paste if readonly
if (!IsModifiable())
return NS_OK;
nsresult rv;
nsCOMPtr<nsIClipboard> clipboard(do_GetService(kCClipboardCID, &rv));
if (NS_FAILED(rv)) return rv;
// the flavors that we can deal with
char* textEditorFlavors[] = { kUnicodeMime, nsnull };
nsCOMPtr<nsISupportsArray> flavorsList;
rv = nsComponentManager::CreateInstance(NS_SUPPORTSARRAY_CONTRACTID, nsnull,
NS_GET_IID(nsISupportsArray), getter_AddRefs(flavorsList));
if (NS_FAILED(rv)) return rv;
PRUint32 editorFlags;
GetFlags(&editorFlags);
// add the flavors for text editors
for (char** flavor = textEditorFlavors; *flavor; flavor++)
{
nsCOMPtr<nsISupportsString> flavorString;
nsComponentManager::CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, nsnull,
NS_GET_IID(nsISupportsString), getter_AddRefs(flavorString));
if (flavorString)
{
flavorString->SetData(*flavor);
flavorsList->AppendElement(flavorString);
}
}
PRBool haveFlavors;
rv = clipboard->HasDataMatchingFlavors(flavorsList, aSelectionType, &haveFlavors);
if (NS_FAILED(rv)) return rv;
*aCanPaste = haveFlavors;
return NS_OK;
}
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