The Tor Browser: editor/libeditor/base/DeleteTextTxn.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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/. */

     6 #include "DeleteTextTxn.h"

     7 #include "mozilla/Assertions.h"

     8 #include "mozilla/dom/Selection.h"

     9 #include "nsAutoPtr.h"

    10 #include "nsDebug.h"

    11 #include "nsEditor.h"

    12 #include "nsError.h"

    13 #include "nsIEditor.h"

    14 #include "nsISelection.h"

    15 #include "nsISupportsImpl.h"

    16 #include "nsSelectionState.h"

    17 #include "nsAString.h"

    19 using namespace mozilla;

    20 using namespace mozilla::dom;

    22 DeleteTextTxn::DeleteTextTxn() :

    23   EditTxn(),

    24   mEditor(nullptr),

    25   mCharData(),

    26   mOffset(0),

    27   mNumCharsToDelete(0),

    28   mRangeUpdater(nullptr)

    29 {

    30 }

    32 NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteTextTxn, EditTxn,

    33                                    mCharData)

    35 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteTextTxn)

    36 NS_INTERFACE_MAP_END_INHERITING(EditTxn)

    38 NS_IMETHODIMP

    39 DeleteTextTxn::Init(nsEditor* aEditor,

    40                     nsIDOMCharacterData* aCharData,

    41                     uint32_t aOffset,

    42                     uint32_t aNumCharsToDelete,

    43                     nsRangeUpdater* aRangeUpdater)

    44 {

    45   MOZ_ASSERT(aEditor && aCharData);

    47   mEditor = aEditor;

    48   mCharData = aCharData;

    50   // do nothing if the node is read-only

    51   if (!mEditor->IsModifiableNode(mCharData)) {

    52     return NS_ERROR_FAILURE;

    53   }

    55   mOffset = aOffset;

    56   mNumCharsToDelete = aNumCharsToDelete;

    57 #ifdef DEBUG

    58   uint32_t length;

    59   mCharData->GetLength(&length);

    60   NS_ASSERTION(length >= aOffset + aNumCharsToDelete,

    61                "Trying to delete more characters than in node");

    62 #endif

    63   mDeletedText.Truncate();

    64   mRangeUpdater = aRangeUpdater;

    65   return NS_OK;

    66 }

    68 NS_IMETHODIMP

    69 DeleteTextTxn::DoTransaction()

    70 {

    71   MOZ_ASSERT(mEditor && mCharData);

    73   // get the text that we're about to delete

    74   nsresult res = mCharData->SubstringData(mOffset, mNumCharsToDelete,

    75                                           mDeletedText);

    76   MOZ_ASSERT(NS_SUCCEEDED(res));

    77   res = mCharData->DeleteData(mOffset, mNumCharsToDelete);

    78   NS_ENSURE_SUCCESS(res, res);

    80   if (mRangeUpdater) {

    81     mRangeUpdater->SelAdjDeleteText(mCharData, mOffset, mNumCharsToDelete);

    82   }

    84   // only set selection to deletion point if editor gives permission

    85   bool bAdjustSelection;

    86   mEditor->ShouldTxnSetSelection(&bAdjustSelection);

    87   if (bAdjustSelection) {

    88     nsRefPtr<Selection> selection = mEditor->GetSelection();

    89     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);

    90     res = selection->Collapse(mCharData, mOffset);

    91     NS_ASSERTION(NS_SUCCEEDED(res),

    92                  "selection could not be collapsed after undo of deletetext.");

    93     NS_ENSURE_SUCCESS(res, res);

    94   }

    95   // else do nothing - dom range gravity will adjust selection

    96   return NS_OK;

    97 }

    99 //XXX: we may want to store the selection state and restore it properly

   100 //     was it an insertion point or an extended selection?

   101 NS_IMETHODIMP

   102 DeleteTextTxn::UndoTransaction()

   103 {

   104   MOZ_ASSERT(mEditor && mCharData);

   106   return mCharData->InsertData(mOffset, mDeletedText);

   107 }

   109 NS_IMETHODIMP

   110 DeleteTextTxn::GetTxnDescription(nsAString& aString)

   111 {

   112   aString.AssignLiteral("DeleteTextTxn: ");

   113   aString += mDeletedText;

   114   return NS_OK;

   115 }

The Tor Browser / file revision