gecko-dev/layout/base/nsAutoCopy.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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 Communicator client 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):
* shaver@mozilla.org
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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
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* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsIAutoCopy.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsISelectionListener.h"
#include "nsIDOMDocument.h"
#include "nsCopySupport.h"
#include "nsIClipboard.h"
#include "nsIDocument.h"
#include "nsSupportsPrimitives.h"
class nsAutoCopyService : public nsIAutoCopyService , public nsISelectionListener
{
public:
NS_DECL_ISUPPORTS
nsAutoCopyService();
virtual ~nsAutoCopyService(){}//someday maybe we have it able to shutdown during run
//nsIAutoCopyService interfaces
NS_IMETHOD Listen(nsISelection *aDomSelection);
//end nsIAutoCopyService
//nsISelectionListener interfaces
NS_IMETHOD NotifySelectionChanged(nsIDOMDocument *aDoc, nsISelection *aSel, short aReason);
//end nsISelectionListener
};
// Implement our nsISupports methods
NS_IMPL_ISUPPORTS2(nsAutoCopyService, nsIAutoCopyService,nsISelectionListener)
nsresult
NS_NewAutoCopyService(nsIAutoCopyService** aResult)
{
*aResult = new nsAutoCopyService;
if (!*aResult)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aResult);
return NS_OK;
}
nsAutoCopyService::nsAutoCopyService()
{
}
NS_IMETHODIMP
nsAutoCopyService::Listen(nsISelection *aDomSelection)
{
if (!aDomSelection)
return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsISelection> selection(aDomSelection);
nsCOMPtr<nsISelectionPrivate> selectionPrivate(do_QueryInterface(selection));
return selectionPrivate->AddSelectionListener(this);
}
/*
* What we do now:
* On every selection change, we copy to the clipboard anew, creating a
* HTML buffer, a transferable, an nsISupportsString and
* a huge mess every time. This is basically what nsPresShell::DoCopy does
* to move the selection into the clipboard for Edit->Copy.
*
* What we should do, to make our end of the deal faster:
* Create a singleton transferable with our own magic converter. When selection
* changes (use a quick cache to detect ``real'' changes), we put the new
* nsISelection in the transferable. Our magic converter will take care of
* transferable->whatever-other-format when the time comes to actually
* hand over the clipboard contents.
*
* Other issues:
* - which X clipboard should we populate?
* - should we use a different one than Edit->Copy, so that inadvertant
* selections (or simple clicks, which currently cause a selection
* notification, regardless of if they're in the document which currently has
* selection!) don't lose the contents of the ``application''? Or should we
* just put some intelligence in the ``is this a real selection?'' code to
* protect our selection against clicks in other documents that don't create
* selections?
* - maybe we should just never clear the X clipboard? That would make this
* problem just go away, which is very tempting.
*/
#define DRAGGING 1
NS_IMETHODIMP
nsAutoCopyService::NotifySelectionChanged(nsIDOMDocument *aDoc, nsISelection *aSel, short aReason)
{
nsresult rv;
if (!(aReason & nsISelectionListener::MOUSEUP_REASON ||
aReason & nsISelectionListener::SELECTALL_REASON ||
aReason & nsISelectionListener::KEYPRESS_REASON))
return NS_OK; //dont care if we are still dragging
PRBool collapsed;
if (!aDoc || !aSel || NS_FAILED(aSel->GetIsCollapsed(&collapsed)) || collapsed) {
#ifdef DEBUG_CLIPBOARD
fprintf(stderr, "CLIPBOARD: no selection/collapsed selection\n");
#endif
/* clear X clipboard? */
return NS_OK;
}
nsCOMPtr<nsIDocument> doc;
doc = do_QueryInterface(NS_REINTERPRET_CAST(nsISupports *,aDoc),&rv);
if (NS_FAILED(rv))
return rv;
if (!doc)
return NS_ERROR_NULL_POINTER;
// call the copy code
rv = nsCopySupport::HTMLCopy(aSel, doc, nsIClipboard::kSelectionClipboard);
return rv;
}