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editor/libeditor/base/SplitElementTxn.cpp@b8a032363ba2 (annotated)

editor/libeditor/base/SplitElementTxn.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 22 Jan 2015 13:21:57 +0100
branch
TOR_BUG_9701
changeset 15
b8a032363ba2
permissions
-rw-r--r--

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

michael@0 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0 2 /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0 3 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 5
michael@0 6 #include <stdio.h> // for printf
michael@0 7
michael@0 8 #include "SplitElementTxn.h"
michael@0 9 #include "nsAString.h"
michael@0 10 #include "nsDebug.h" // for NS_ASSERTION, etc
michael@0 11 #include "nsEditor.h" // for nsEditor
michael@0 12 #include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc
michael@0 13 #include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
michael@0 14 #include "nsIDOMNode.h" // for nsIDOMNode
michael@0 15 #include "nsIEditor.h" // for nsEditor::DebugDumpContent, etc
michael@0 16 #include "nsISelection.h" // for nsISelection
michael@0 17 #include "nsISupportsUtils.h" // for NS_ADDREF
michael@0 18
michael@0 19 // note that aEditor is not refcounted
michael@0 20 SplitElementTxn::SplitElementTxn()
michael@0 21 : EditTxn()
michael@0 22 {
michael@0 23 }
michael@0 24
michael@0 25 NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitElementTxn, EditTxn,
michael@0 26 mParent,
michael@0 27 mNewLeftNode)
michael@0 28
michael@0 29 NS_IMPL_ADDREF_INHERITED(SplitElementTxn, EditTxn)
michael@0 30 NS_IMPL_RELEASE_INHERITED(SplitElementTxn, EditTxn)
michael@0 31 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitElementTxn)
michael@0 32 NS_INTERFACE_MAP_END_INHERITING(EditTxn)
michael@0 33
michael@0 34 NS_IMETHODIMP SplitElementTxn::Init(nsEditor *aEditor,
michael@0 35 nsIDOMNode *aNode,
michael@0 36 int32_t aOffset)
michael@0 37 {
michael@0 38 NS_ASSERTION(aEditor && aNode, "bad args");
michael@0 39 if (!aEditor || !aNode) { return NS_ERROR_NOT_INITIALIZED; }
michael@0 40
michael@0 41 mEditor = aEditor;
michael@0 42 mExistingRightNode = do_QueryInterface(aNode);
michael@0 43 mOffset = aOffset;
michael@0 44 return NS_OK;
michael@0 45 }
michael@0 46
michael@0 47 NS_IMETHODIMP SplitElementTxn::DoTransaction(void)
michael@0 48 {
michael@0 49 NS_ASSERTION(mExistingRightNode && mEditor, "bad state");
michael@0 50 if (!mExistingRightNode || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
michael@0 51
michael@0 52 // create a new node
michael@0 53 nsresult result = mExistingRightNode->CloneNode(false, 1, getter_AddRefs(mNewLeftNode));
michael@0 54 NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
michael@0 55 NS_ENSURE_SUCCESS(result, result);
michael@0 56 NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NULL_POINTER);
michael@0 57 mEditor->MarkNodeDirty(mExistingRightNode);
michael@0 58
michael@0 59 // get the parent node
michael@0 60 result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
michael@0 61 NS_ENSURE_SUCCESS(result, result);
michael@0 62 NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
michael@0 63
michael@0 64 // insert the new node
michael@0 65 result = mEditor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
michael@0 66 if (mNewLeftNode) {
michael@0 67 bool bAdjustSelection;
michael@0 68 mEditor->ShouldTxnSetSelection(&bAdjustSelection);
michael@0 69 if (bAdjustSelection)
michael@0 70 {
michael@0 71 nsCOMPtr<nsISelection> selection;
michael@0 72 result = mEditor->GetSelection(getter_AddRefs(selection));
michael@0 73 NS_ENSURE_SUCCESS(result, result);
michael@0 74 NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
michael@0 75 result = selection->Collapse(mNewLeftNode, mOffset);
michael@0 76 }
michael@0 77 else
michael@0 78 {
michael@0 79 // do nothing - dom range gravity will adjust selection
michael@0 80 }
michael@0 81 }
michael@0 82 return result;
michael@0 83 }
michael@0 84
michael@0 85 NS_IMETHODIMP SplitElementTxn::UndoTransaction(void)
michael@0 86 {
michael@0 87 NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
michael@0 88 if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
michael@0 89 return NS_ERROR_NOT_INITIALIZED;
michael@0 90 }
michael@0 91
michael@0 92 // this assumes Do inserted the new node in front of the prior existing node
michael@0 93 nsCOMPtr<nsINode> rightNode = do_QueryInterface(mExistingRightNode);
michael@0 94 nsCOMPtr<nsINode> leftNode = do_QueryInterface(mNewLeftNode);
michael@0 95 nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
michael@0 96 NS_ENSURE_TRUE(rightNode && leftNode && parent, NS_ERROR_FAILURE);
michael@0 97 return mEditor->JoinNodesImpl(rightNode, leftNode, parent);
michael@0 98 }
michael@0 99
michael@0 100 /* redo cannot simply resplit the right node, because subsequent transactions
michael@0 101 * on the redo stack may depend on the left node existing in its previous state.
michael@0 102 */
michael@0 103 NS_IMETHODIMP SplitElementTxn::RedoTransaction(void)
michael@0 104 {
michael@0 105 NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
michael@0 106 if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
michael@0 107 return NS_ERROR_NOT_INITIALIZED;
michael@0 108 }
michael@0 109
michael@0 110 nsresult result;
michael@0 111 nsCOMPtr<nsIDOMNode>resultNode;
michael@0 112 // first, massage the existing node so it is in its post-split state
michael@0 113 nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mExistingRightNode);
michael@0 114 if (rightNodeAsText)
michael@0 115 {
michael@0 116 nsresult result = rightNodeAsText->DeleteData(0, mOffset);
michael@0 117 NS_ENSURE_SUCCESS(result, result);
michael@0 118 }
michael@0 119 else
michael@0 120 {
michael@0 121 nsCOMPtr<nsIDOMNode>child;
michael@0 122 nsCOMPtr<nsIDOMNode>nextSibling;
michael@0 123 result = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
michael@0 124 int32_t i;
michael@0 125 for (i=0; i<mOffset; i++)
michael@0 126 {
michael@0 127 if (NS_FAILED(result)) {return result;}
michael@0 128 if (!child) {return NS_ERROR_NULL_POINTER;}
michael@0 129 child->GetNextSibling(getter_AddRefs(nextSibling));
michael@0 130 result = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
michael@0 131 if (NS_SUCCEEDED(result))
michael@0 132 {
michael@0 133 result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
michael@0 134 }
michael@0 135 child = do_QueryInterface(nextSibling);
michael@0 136 }
michael@0 137 }
michael@0 138 // second, re-insert the left node into the tree
michael@0 139 result = mParent->InsertBefore(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
michael@0 140 return result;
michael@0 141 }
michael@0 142
michael@0 143
michael@0 144 NS_IMETHODIMP SplitElementTxn::GetTxnDescription(nsAString& aString)
michael@0 145 {
michael@0 146 aString.AssignLiteral("SplitElementTxn");
michael@0 147 return NS_OK;
michael@0 148 }
michael@0 149
michael@0 150 NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
michael@0 151 {
michael@0 152 NS_ENSURE_TRUE(aNewNode, NS_ERROR_NULL_POINTER);
michael@0 153 NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NOT_INITIALIZED);
michael@0 154 *aNewNode = mNewLeftNode;
michael@0 155 NS_ADDREF(*aNewNode);
michael@0 156 return NS_OK;
michael@0 157 }

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