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 #include "nsISupportsPrimitives.h"
  12
  13 nsBaseClipboard::nsBaseClipboard()
  14     : mEmptyingForSetData(false), mIgnoreEmptyNotification(false) {}
  15
  16 nsBaseClipboard::~nsBaseClipboard() {
  17   EmptyClipboard(kSelectionClipboard);
  18   EmptyClipboard(kGlobalClipboard);
  19   EmptyClipboard(kFindClipboard);
  20 }
  21
  22 NS_IMPL_ISUPPORTS(nsBaseClipboard, nsIClipboard)
  23
  24 /**
  25  * Sets the transferable object
  26  *
  27  */
  28 NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable* aTransferable,
  29                                        nsIClipboardOwner* anOwner,
  30                                        int32_t aWhichClipboard) {
  31   NS_ASSERTION(aTransferable, "clipboard given a null transferable");
  32
  33   if (aTransferable == mTransferable && anOwner == mClipboardOwner)
  34     return NS_OK;
  35   bool selectClipPresent;
  36   SupportsSelectionClipboard(&selectClipPresent);
  37   bool findClipPresent;
  38   SupportsFindClipboard(&findClipPresent);
  39   if (!selectClipPresent && !findClipPresent &&
  40       aWhichClipboard != kGlobalClipboard)
  41     return NS_ERROR_FAILURE;
  42
  43   mEmptyingForSetData = true;
  44   EmptyClipboard(aWhichClipboard);
  45   mEmptyingForSetData = false;
  46
  47   mClipboardOwner = anOwner;
  48   mTransferable = aTransferable;
  49
  50   nsresult rv = NS_ERROR_FAILURE;
  51   if (mTransferable) {
  52     rv = SetNativeClipboardData(aWhichClipboard);
  53   }
  54
  55   return rv;
  56 }
  57
  58 /**
  59  * Gets the transferable object
  60  *
  61  */
  62 NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable* aTransferable,
  63                                        int32_t aWhichClipboard) {
  64   NS_ASSERTION(aTransferable, "clipboard given a null transferable");
  65
  66   bool selectClipPresent;
  67   SupportsSelectionClipboard(&selectClipPresent);
  68   bool findClipPresent;
  69   SupportsFindClipboard(&findClipPresent);
  70   if (!selectClipPresent && !findClipPresent &&
  71       aWhichClipboard != kGlobalClipboard)
  72     return NS_ERROR_FAILURE;
  73
  74   if (aTransferable)
  75     return GetNativeClipboardData(aTransferable, aWhichClipboard);
  76
  77   return NS_ERROR_FAILURE;
  78 }
  79
  80 NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard) {
  81   bool selectClipPresent;
  82   SupportsSelectionClipboard(&selectClipPresent);
  83   bool findClipPresent;
  84   SupportsFindClipboard(&findClipPresent);
  85   if (!selectClipPresent && !findClipPresent &&
  86       aWhichClipboard != kGlobalClipboard)
  87     return NS_ERROR_FAILURE;
  88
  89   if (mIgnoreEmptyNotification) return NS_OK;
  90
  91   if (mClipboardOwner) {
  92     mClipboardOwner->LosingOwnership(mTransferable);
  93     mClipboardOwner = nullptr;
  94   }
  95
  96   mTransferable = nullptr;
  97   return NS_OK;
  98 }
  99
 100 NS_IMETHODIMP
 101 nsBaseClipboard::HasDataMatchingFlavors(const char** aFlavorList,
 102                                         uint32_t aLength,
 103                                         int32_t aWhichClipboard,
 104                                         bool* outResult) {
 105   *outResult = true;  // say we always do.
 106   return NS_OK;
 107 }
 108
 109 NS_IMETHODIMP
 110 nsBaseClipboard::SupportsSelectionClipboard(bool* _retval) {
 111   *_retval = false;  // we don't support the selection clipboard by default.
 112   return NS_OK;
 113 }
 114
 115 NS_IMETHODIMP
 116 nsBaseClipboard::SupportsFindClipboard(bool* _retval) {
 117   *_retval = false;  // we don't support the find clipboard by default.
 118   return NS_OK;
 119 }