gecko-dev/widget/xpwidgets/nsClipboardHelper.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 the Mozilla browser.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corp.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
*
* 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
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#include "nsClipboardHelper.h"
// basics
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIServiceManager.h"
// helpers
#include "nsIClipboard.h"
#include "nsITransferable.h"
#include "nsReadableUtils.h"
NS_IMPL_ISUPPORTS1(nsClipboardHelper, nsIClipboardHelper)
/*****************************************************************************
* nsClipboardHelper ctor / dtor
*****************************************************************************/
nsClipboardHelper::nsClipboardHelper()
{
}
nsClipboardHelper::~nsClipboardHelper()
{
// no members, nothing to destroy
}
/*****************************************************************************
* nsIClipboardHelper methods
*****************************************************************************/
NS_IMETHODIMP
nsClipboardHelper::CopyStringToClipboard(const nsAString& aString,
PRInt32 aClipboardID)
{
nsresult rv;
// get the clipboard
nsCOMPtr<nsIClipboard>
clipboard(do_GetService("@mozilla.org/widget/clipboard;1", &rv));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(clipboard, NS_ERROR_FAILURE);
// don't go any further if they're asking for the selection
// clipboard on a platform which doesn't support it (i.e., unix)
if (nsIClipboard::kSelectionClipboard == aClipboardID) {
bool clipboardSupported;
rv = clipboard->SupportsSelectionClipboard(&clipboardSupported);
NS_ENSURE_SUCCESS(rv, rv);
if (!clipboardSupported)
return NS_ERROR_FAILURE;
}
// create a transferable for putting data on the clipboard
nsCOMPtr<nsITransferable>
trans(do_CreateInstance("@mozilla.org/widget/transferable;1", &rv));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(trans, NS_ERROR_FAILURE);
// Add the text data flavor to the transferable
rv = trans->AddDataFlavor(kUnicodeMime);
NS_ENSURE_SUCCESS(rv, rv);
// get wStrings to hold clip data
nsCOMPtr<nsISupportsString>
data(do_CreateInstance("@mozilla.org/supports-string;1", &rv));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(data, NS_ERROR_FAILURE);
// populate the string
rv = data->SetData(aString);
NS_ENSURE_SUCCESS(rv, rv);
// qi the data object an |nsISupports| so that when the transferable holds
// onto it, it will addref the correct interface.
nsCOMPtr<nsISupports> genericData(do_QueryInterface(data, &rv));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(genericData, NS_ERROR_FAILURE);
// set the transfer data
rv = trans->SetTransferData(kUnicodeMime, genericData,
aString.Length() * 2);
NS_ENSURE_SUCCESS(rv, rv);
// put the transferable on the clipboard
rv = clipboard->SetData(trans, nsnull, aClipboardID);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMETHODIMP
nsClipboardHelper::CopyString(const nsAString& aString)
{
nsresult rv;
// copy to the global clipboard. it's bad if this fails in any way.
rv = CopyStringToClipboard(aString, nsIClipboard::kGlobalClipboard);
NS_ENSURE_SUCCESS(rv, rv);
// unix also needs us to copy to the selection clipboard. this will
// fail in CopyStringToClipboard if we're not on a platform that
// supports the selection clipboard. (this could have been #ifdef
// XP_UNIX, but using the SupportsSelectionClipboard call is the
// more correct thing to do.
//
// if this fails in any way other than "not being unix", we'll get
// the assertion we need in CopyStringToClipboard, and we needn't
// assert again here.
CopyStringToClipboard(aString, nsIClipboard::kSelectionClipboard);
return NS_OK;
}