widget/src/xpwidgets/nsBaseClipboard.cpp
author Vivien Nicolas <21@vingtetun.org>
Wed, 14 Dec 2011 11:34:33 +0100
changeset 83341 7c621c7bfea34f5a9ec5eb09b23c5ae7be1c8294
parent 79482 ec7577dec4fceef0ac2717416d9c48289402d935
child 108863 f93960a93ad97a56d308bd9ce25d97cbc175d524
permissions -rw-r--r--
Bug 709010 - Add a empty components directory to b2g/. r=cjones

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
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 * 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.
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 * Contributor(s):
 *
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 * 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"),
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#include "nsBaseClipboard.h"

#include "nsIClipboardOwner.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"

nsBaseClipboard::nsBaseClipboard()
{
  mClipboardOwner          = nsnull;
  mTransferable            = nsnull;
  mIgnoreEmptyNotification = false;

}

nsBaseClipboard::~nsBaseClipboard()
{
  EmptyClipboard(kSelectionClipboard);
  EmptyClipboard(kGlobalClipboard);
}

NS_IMPL_ISUPPORTS1(nsBaseClipboard, nsIClipboard)

/**
  * Sets the transferable object
  *
  */
NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable * aTransferable, nsIClipboardOwner * anOwner,
                                        PRInt32 aWhichClipboard)
{
  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );

  if (aTransferable == mTransferable && anOwner == mClipboardOwner)
    return NS_OK;
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  if ( !selectClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  EmptyClipboard(aWhichClipboard);

  mClipboardOwner = anOwner;
  if ( anOwner )
    NS_ADDREF(mClipboardOwner);

  mTransferable = aTransferable;
  
  nsresult rv = NS_ERROR_FAILURE;

  if ( mTransferable ) {
    NS_ADDREF(mTransferable);
    if (!mPrivacyHandler) {
      rv = NS_NewClipboardPrivacyHandler(getter_AddRefs(mPrivacyHandler));
      NS_ENSURE_SUCCESS(rv, rv);
    }
    rv = mPrivacyHandler->PrepareDataForClipboard(mTransferable);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = SetNativeClipboardData(aWhichClipboard);
  }
  
  return rv;
}

/**
  * Gets the transferable object
  *
  */
NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable * aTransferable, PRInt32 aWhichClipboard)
{
  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );
  
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  if ( !selectClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  if ( aTransferable )
    return GetNativeClipboardData(aTransferable, aWhichClipboard);

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(PRInt32 aWhichClipboard)
{
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  if ( !selectClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  if (mIgnoreEmptyNotification)
    return NS_OK;

  if ( mClipboardOwner ) {
    mClipboardOwner->LosingOwnership(mTransferable);
    NS_RELEASE(mClipboardOwner);
  }

  NS_IF_RELEASE(mTransferable);

  return NS_OK;
}

NS_IMETHODIMP
nsBaseClipboard::HasDataMatchingFlavors(const char** aFlavorList,
                                        PRUint32 aLength,
                                        PRInt32 aWhichClipboard,
                                        bool* outResult) 
{
  *outResult = true;  // say we always do.
  return NS_OK;
}

NS_IMETHODIMP
nsBaseClipboard::SupportsSelectionClipboard(bool* _retval)
{
  *_retval = false;   // we don't support the selection clipboard by default.
  return NS_OK;
}