зеркало из https://github.com/mozilla/gecko-dev.git
124 строки
3.8 KiB
C++
124 строки
3.8 KiB
C++
/* -*- 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,
|
|
mEditorBase,
|
|
mLeftNode,
|
|
mRightNode,
|
|
mParent)
|
|
|
|
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodeTransaction)
|
|
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
|
|
|
|
bool
|
|
JoinNodeTransaction::CanDoIt() const
|
|
{
|
|
if (NS_WARN_IF(!mLeftNode) ||
|
|
NS_WARN_IF(!mRightNode) ||
|
|
NS_WARN_IF(!mEditorBase) ||
|
|
!mLeftNode->GetParentNode()) {
|
|
return false;
|
|
}
|
|
return mEditorBase->IsModifiableNode(mLeftNode->GetParentNode());
|
|
}
|
|
|
|
// After DoTransaction() and RedoTransaction(), the left node is removed from
|
|
// the content tree and right node remains.
|
|
NS_IMETHODIMP
|
|
JoinNodeTransaction::DoTransaction()
|
|
{
|
|
if (NS_WARN_IF(!mEditorBase) ||
|
|
NS_WARN_IF(!mLeftNode) ||
|
|
NS_WARN_IF(!mRightNode)) {
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
}
|
|
|
|
// 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()
|
|
{
|
|
if (NS_WARN_IF(!mParent) ||
|
|
NS_WARN_IF(!mLeftNode) ||
|
|
NS_WARN_IF(!mRightNode)) {
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
}
|
|
|
|
// 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
|