editor/libeditor/InsertNodeTxn.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 "InsertNodeTxn.h"
   7
   8 #include "mozilla/dom/Selection.h"      // for Selection
   9
  10 #include "nsAString.h"
  11 #include "nsDebug.h"                    // for NS_ENSURE_TRUE, etc
  12 #include "nsEditor.h"                   // for nsEditor
  13 #include "nsError.h"                    // for NS_ERROR_NULL_POINTER, etc
  14 #include "nsIContent.h"                 // for nsIContent
  15 #include "nsMemory.h"                   // for nsMemory
  16 #include "nsReadableUtils.h"            // for ToNewCString
  17 #include "nsString.h"                   // for nsString
  18
  19 using namespace mozilla;
  20 using namespace mozilla::dom;
  21
  22 InsertNodeTxn::InsertNodeTxn(nsIContent& aNode, nsINode& aParent,
  23                              int32_t aOffset, nsEditor& aEditor)
  24   : EditTxn()
  25   , mNode(&aNode)
  26   , mParent(&aParent)
  27   , mOffset(aOffset)
  28   , mEditor(aEditor)
  29 {
  30 }
  31
  32 InsertNodeTxn::~InsertNodeTxn()
  33 {
  34 }
  35
  36 NS_IMPL_CYCLE_COLLECTION_INHERITED(InsertNodeTxn, EditTxn,
  37                                    mNode,
  38                                    mParent)
  39
  40 NS_IMPL_ADDREF_INHERITED(InsertNodeTxn, EditTxn)
  41 NS_IMPL_RELEASE_INHERITED(InsertNodeTxn, EditTxn)
  42 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(InsertNodeTxn)
  43 NS_INTERFACE_MAP_END_INHERITING(EditTxn)
  44
  45 NS_IMETHODIMP
  46 InsertNodeTxn::DoTransaction()
  47 {
  48   MOZ_ASSERT(mNode && mParent);
  49
  50   uint32_t count = mParent->GetChildCount();
  51   if (mOffset > static_cast<int32_t>(count) || mOffset == -1) {
  52     // -1 is sentinel value meaning "append at end"
  53     mOffset = count;
  54   }
  55
  56   // Note, it's ok for ref to be null. That means append.
  57   nsCOMPtr<nsIContent> ref = mParent->GetChildAt(mOffset);
  58
  59   mEditor.MarkNodeDirty(GetAsDOMNode(mNode));
  60
  61   ErrorResult rv;
  62   mParent->InsertBefore(*mNode, ref, rv);
  63   NS_ENSURE_TRUE(!rv.Failed(), rv.StealNSResult());
  64
  65   // Only set selection to insertion point if editor gives permission
  66   if (mEditor.GetShouldTxnSetSelection()) {
  67     RefPtr<Selection> selection = mEditor.GetSelection();
  68     NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
  69     // Place the selection just after the inserted element
  70     selection->Collapse(mParent, mOffset + 1);
  71   } else {
  72     // Do nothing - DOM Range gravity will adjust selection
  73   }
  74   return NS_OK;
  75 }
  76
  77 NS_IMETHODIMP
  78 InsertNodeTxn::UndoTransaction()
  79 {
  80   MOZ_ASSERT(mNode && mParent);
  81
  82   ErrorResult rv;
  83   mParent->RemoveChild(*mNode, rv);
  84   return rv.StealNSResult();
  85 }
  86
  87 NS_IMETHODIMP
  88 InsertNodeTxn::GetTxnDescription(nsAString& aString)
  89 {
  90   aString.AssignLiteral("InsertNodeTxn");
  91   return NS_OK;
  92 }