summaryrefslogtreecommitdiffstats
path: root/editor/libeditor/JoinNodeTransaction.cpp
diff options
context:
space:
mode:
authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /editor/libeditor/JoinNodeTransaction.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
downloadUXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip
Add m-esr52 at 52.6.0
Diffstat (limited to 'editor/libeditor/JoinNodeTransaction.cpp')
-rw-r--r--editor/libeditor/JoinNodeTransaction.cpp109
1 files changed, 109 insertions, 0 deletions
diff --git a/editor/libeditor/JoinNodeTransaction.cpp b/editor/libeditor/JoinNodeTransaction.cpp
new file mode 100644
index 000000000..228d1f4d6
--- /dev/null
+++ b/editor/libeditor/JoinNodeTransaction.cpp
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "JoinNodeTransaction.h"
+
+#include "mozilla/EditorBase.h" // for EditorBase
+#include "nsAString.h"
+#include "nsDebug.h" // for NS_ASSERTION, etc.
+#include "nsError.h" // for NS_ERROR_NULL_POINTER, etc.
+#include "nsIContent.h" // for nsIContent
+#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
+#include "nsIEditor.h" // for EditorBase::IsModifiableNode
+#include "nsISupportsImpl.h" // for QueryInterface, etc.
+
+namespace mozilla {
+
+using namespace dom;
+
+JoinNodeTransaction::JoinNodeTransaction(EditorBase& aEditorBase,
+ nsINode& aLeftNode,
+ nsINode& aRightNode)
+ : mEditorBase(aEditorBase)
+ , mLeftNode(&aLeftNode)
+ , mRightNode(&aRightNode)
+ , mOffset(0)
+{
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinNodeTransaction, EditTransactionBase,
+ mLeftNode,
+ mRightNode,
+ mParent)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodeTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+nsresult
+JoinNodeTransaction::CheckValidity()
+{
+ if (!mEditorBase.IsModifiableNode(mLeftNode->GetParentNode())) {
+ return NS_ERROR_FAILURE;
+ }
+ return NS_OK;
+}
+
+// After DoTransaction() and RedoTransaction(), the left node is removed from
+// the content tree and right node remains.
+NS_IMETHODIMP
+JoinNodeTransaction::DoTransaction()
+{
+ // Get the parent node
+ nsCOMPtr<nsINode> leftParent = mLeftNode->GetParentNode();
+ NS_ENSURE_TRUE(leftParent, NS_ERROR_NULL_POINTER);
+
+ // Verify that mLeftNode and mRightNode have the same parent
+ if (leftParent != mRightNode->GetParentNode()) {
+ NS_ASSERTION(false, "Nodes do not have same parent");
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ // Set this instance's mParent. Other methods will see a non-null mParent
+ // and know all is well
+ mParent = leftParent;
+ mOffset = mLeftNode->Length();
+
+ return mEditorBase.JoinNodesImpl(mRightNode, mLeftNode, mParent);
+}
+
+//XXX: What if instead of split, we just deleted the unneeded children of
+// mRight and re-inserted mLeft?
+NS_IMETHODIMP
+JoinNodeTransaction::UndoTransaction()
+{
+ MOZ_ASSERT(mParent);
+
+ // First, massage the existing node so it is in its post-split state
+ ErrorResult rv;
+ if (mRightNode->GetAsText()) {
+ rv = mRightNode->GetAsText()->DeleteData(0, mOffset);
+ } else {
+ nsCOMPtr<nsIContent> child = mRightNode->GetFirstChild();
+ for (uint32_t i = 0; i < mOffset; i++) {
+ if (rv.Failed()) {
+ return rv.StealNSResult();
+ }
+ if (!child) {
+ return NS_ERROR_NULL_POINTER;
+ }
+ nsCOMPtr<nsIContent> nextSibling = child->GetNextSibling();
+ mLeftNode->AppendChild(*child, rv);
+ child = nextSibling;
+ }
+ }
+ // Second, re-insert the left node into the tree
+ nsCOMPtr<nsINode> refNode = mRightNode;
+ mParent->InsertBefore(*mLeftNode, refNode, rv);
+ return rv.StealNSResult();
+}
+
+NS_IMETHODIMP
+JoinNodeTransaction::GetTxnDescription(nsAString& aString)
+{
+ aString.AssignLiteral("JoinNodeTransaction");
+ return NS_OK;
+}
+
+} // namespace mozilla