widget/nsBaseClipboard.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsBaseClipboard.h"
   7
   8 #include "nsIClipboardOwner.h"
   9 #include "nsCOMPtr.h"
  10 #include "nsXPCOM.h"
  11
  12 nsBaseClipboard::nsBaseClipboard()
  13     : mEmptyingForSetData(false), mIgnoreEmptyNotification(false) {}
  14
  15 nsBaseClipboard::~nsBaseClipboard() {
  16   EmptyClipboard(kSelectionClipboard);
  17   EmptyClipboard(kGlobalClipboard);
  18   EmptyClipboard(kFindClipboard);
  19 }
  20
  21 NS_IMPL_ISUPPORTS(nsBaseClipboard, nsIClipboard)
  22
  23 /**
  24  * Sets the transferable object
  25  *
  26  */
  27 NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable* aTransferable,
  28                                        nsIClipboardOwner* anOwner,
  29                                        int32_t aWhichClipboard) {
  30   NS_ASSERTION(aTransferable, "clipboard given a null transferable");
  31
  32   if (aTransferable == mTransferable && anOwner == mClipboardOwner)
  33     return NS_OK;
  34   bool selectClipPresent;
  35   SupportsSelectionClipboard(&selectClipPresent);
  36   bool findClipPresent;
  37   SupportsFindClipboard(&findClipPresent);
  38   if (!selectClipPresent && !findClipPresent &&
  39       aWhichClipboard != kGlobalClipboard)
  40     return NS_ERROR_FAILURE;
  41
  42   mEmptyingForSetData = true;
  43   EmptyClipboard(aWhichClipboard);
  44   mEmptyingForSetData = false;
  45
  46   mClipboardOwner = anOwner;
  47   mTransferable = aTransferable;
  48
  49   nsresult rv = NS_ERROR_FAILURE;
  50   if (mTransferable) {
  51     rv = SetNativeClipboardData(aWhichClipboard);
  52   }
  53
  54   return rv;
  55 }
  56
  57 /**
  58  * Gets the transferable object
  59  *
  60  */
  61 NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable* aTransferable,
  62                                        int32_t aWhichClipboard) {
  63   NS_ASSERTION(aTransferable, "clipboard given a null transferable");
  64
  65   bool selectClipPresent;
  66   SupportsSelectionClipboard(&selectClipPresent);
  67   bool findClipPresent;
  68   SupportsFindClipboard(&findClipPresent);
  69   if (!selectClipPresent && !findClipPresent &&
  70       aWhichClipboard != kGlobalClipboard)
  71     return NS_ERROR_FAILURE;
  72
  73   if (aTransferable)
  74     return GetNativeClipboardData(aTransferable, aWhichClipboard);
  75
  76   return NS_ERROR_FAILURE;
  77 }
  78
  79 NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard) {
  80   bool selectClipPresent;
  81   SupportsSelectionClipboard(&selectClipPresent);
  82   bool findClipPresent;
  83   SupportsFindClipboard(&findClipPresent);
  84   if (!selectClipPresent && !findClipPresent &&
  85       aWhichClipboard != kGlobalClipboard)
  86     return NS_ERROR_FAILURE;
  87
  88   if (mIgnoreEmptyNotification) return NS_OK;
  89
  90   if (mClipboardOwner) {
  91     mClipboardOwner->LosingOwnership(mTransferable);
  92     mClipboardOwner = nullptr;
  93   }
  94
  95   mTransferable = nullptr;
  96   return NS_OK;
  97 }
  98
  99 NS_IMETHODIMP
 100 nsBaseClipboard::HasDataMatchingFlavors(const nsTArray<nsCString>& aFlavorList,
 101                                         int32_t aWhichClipboard,
 102                                         bool* outResult) {
 103   *outResult = true;  // say we always do.
 104   return NS_OK;
 105 }
 106
 107 NS_IMETHODIMP
 108 nsBaseClipboard::SupportsSelectionClipboard(bool* _retval) {
 109   *_retval = false;  // we don't support the selection clipboard by default.
 110   return NS_OK;
 111 }
 112
 113 NS_IMETHODIMP
 114 nsBaseClipboard::SupportsFindClipboard(bool* _retval) {
 115   *_retval = false;  // we don't support the find clipboard by default.
 116   return NS_OK;
 117 }