widget/nsBaseClipboard.cpp
author Carsten "Tomcat" Book <cbook@mozilla.com>
Mon, 18 Apr 2016 14:22:00 +0200
changeset 331459 f9390125f8425c6a72502f58a0a173c2965086ac
parent 316085 c0be07690562d76bd836a24c817c015b1086f3a2
child 351153 fb83488b8880a9d8a4c97089fbf5f3c5a3b0301c
permissions -rw-r--r--
Backed out changeset 4e02fc1cbd35 (bug 1264199)

/* -*- 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 "nsBaseClipboard.h"

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

nsBaseClipboard::nsBaseClipboard()
  : mEmptyingForSetData(false)
  , mIgnoreEmptyNotification(false)
{
}

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

NS_IMPL_ISUPPORTS(nsBaseClipboard, nsIClipboard)

/**
  * Sets the transferable object
  *
  */
NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable * aTransferable, nsIClipboardOwner * anOwner,
                                        int32_t aWhichClipboard)
{
  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );

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

  mEmptyingForSetData = true;
  EmptyClipboard(aWhichClipboard);
  mEmptyingForSetData = false;

  mClipboardOwner = anOwner;
  mTransferable = aTransferable;

  nsresult rv = NS_ERROR_FAILURE;
  if (mTransferable) {
    rv = SetNativeClipboardData(aWhichClipboard);
  }

  return rv;
}

/**
  * Gets the transferable object
  *
  */
NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable * aTransferable, int32_t aWhichClipboard)
{
  NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );

  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  bool findClipPresent;
  SupportsFindClipboard(&findClipPresent);
  if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

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

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard)
{
  bool selectClipPresent;
  SupportsSelectionClipboard(&selectClipPresent);
  bool findClipPresent;
  SupportsFindClipboard(&findClipPresent);
  if (!selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard)
    return NS_ERROR_FAILURE;

  if (mIgnoreEmptyNotification)
    return NS_OK;

  if (mClipboardOwner) {
    mClipboardOwner->LosingOwnership(mTransferable);
    mClipboardOwner = nullptr;
  }

  mTransferable = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
nsBaseClipboard::HasDataMatchingFlavors(const char** aFlavorList,
                                        uint32_t aLength,
                                        int32_t 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;
}

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