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 {
  15   mClipboardOwner          = nullptr;
  16   mTransferable            = nullptr;
  17   mIgnoreEmptyNotification = false;
  18   mEmptyingForSetData      = false;
  19 }
  20
  21 nsBaseClipboard::~nsBaseClipboard()
  22 {
  23   EmptyClipboard(kSelectionClipboard);
  24   EmptyClipboard(kGlobalClipboard);
  25   EmptyClipboard(kFindClipboard);
  26 }
  27
  28 NS_IMPL_ISUPPORTS(nsBaseClipboard, nsIClipboard)
  29
  30 /**
  31   * Sets the transferable object
  32   *
  33   */
  34 NS_IMETHODIMP nsBaseClipboard::SetData(nsITransferable * aTransferable, nsIClipboardOwner * anOwner,
  35                                         int32_t aWhichClipboard)
  36 {
  37   NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );
  38
  39   if (aTransferable == mTransferable && anOwner == mClipboardOwner)
  40     return NS_OK;
  41   bool selectClipPresent;
  42   SupportsSelectionClipboard(&selectClipPresent);
  43   bool findClipPresent;
  44   SupportsFindClipboard(&findClipPresent);
  45   if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
  46     return NS_ERROR_FAILURE;
  47
  48   mEmptyingForSetData = true;
  49   EmptyClipboard(aWhichClipboard);
  50   mEmptyingForSetData = false;
  51
  52   mClipboardOwner = anOwner;
  53   if ( anOwner )
  54     NS_ADDREF(mClipboardOwner);
  55
  56   mTransferable = aTransferable;
  57
  58   nsresult rv = NS_ERROR_FAILURE;
  59
  60   if ( mTransferable ) {
  61     NS_ADDREF(mTransferable);
  62     rv = SetNativeClipboardData(aWhichClipboard);
  63   }
  64
  65   return rv;
  66 }
  67
  68 /**
  69   * Gets the transferable object
  70   *
  71   */
  72 NS_IMETHODIMP nsBaseClipboard::GetData(nsITransferable * aTransferable, int32_t aWhichClipboard)
  73 {
  74   NS_ASSERTION ( aTransferable, "clipboard given a null transferable" );
  75
  76   bool selectClipPresent;
  77   SupportsSelectionClipboard(&selectClipPresent);
  78   bool findClipPresent;
  79   SupportsFindClipboard(&findClipPresent);
  80   if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
  81     return NS_ERROR_FAILURE;
  82
  83   if ( aTransferable )
  84     return GetNativeClipboardData(aTransferable, aWhichClipboard);
  85
  86   return NS_ERROR_FAILURE;
  87 }
  88
  89 NS_IMETHODIMP nsBaseClipboard::EmptyClipboard(int32_t aWhichClipboard)
  90 {
  91   bool selectClipPresent;
  92   SupportsSelectionClipboard(&selectClipPresent);
  93   bool findClipPresent;
  94   SupportsFindClipboard(&findClipPresent);
  95   if ( !selectClipPresent && !findClipPresent && aWhichClipboard != kGlobalClipboard )
  96     return NS_ERROR_FAILURE;
  97
  98   if (mIgnoreEmptyNotification)
  99     return NS_OK;
 100
 101   if ( mClipboardOwner ) {
 102     mClipboardOwner->LosingOwnership(mTransferable);
 103     NS_RELEASE(mClipboardOwner);
 104   }
 105
 106   NS_IF_RELEASE(mTransferable);
 107
 108   return NS_OK;
 109 }
 110
 111 NS_IMETHODIMP
 112 nsBaseClipboard::HasDataMatchingFlavors(const char** aFlavorList,
 113                                         uint32_t aLength,
 114                                         int32_t aWhichClipboard,
 115                                         bool* outResult)
 116 {
 117   *outResult = true;  // say we always do.
 118   return NS_OK;
 119 }
 120
 121 NS_IMETHODIMP
 122 nsBaseClipboard::SupportsSelectionClipboard(bool* _retval)
 123 {
 124   *_retval = false;   // we don't support the selection clipboard by default.
 125   return NS_OK;
 126 }
 127
 128 NS_IMETHODIMP
 129 nsBaseClipboard::SupportsFindClipboard(bool* _retval)
 130 {
 131   *_retval = false;   // we don't support the find clipboard by default.
 132   return NS_OK;
 133 }