mirror of
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256 lines
8.0 KiB
C++
256 lines
8.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h> // for printf
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#include "SplitElementTxn.h"
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#include "nsAString.h"
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#include "nsDebug.h" // for NS_ASSERTION, etc
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#include "nsEditor.h" // for nsEditor
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#include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc
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#include "nsIContent.h" // for nsIContent
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#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
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#include "nsIEditor.h" // for nsEditor::DebugDumpContent, etc
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#include "nsISelection.h" // for nsISelection
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#include "nsISupportsUtils.h" // for NS_ADDREF
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using namespace mozilla;
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#ifdef DEBUG
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static bool gNoisy = false;
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#endif
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// note that aEditor is not refcounted
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SplitElementTxn::SplitElementTxn()
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: EditTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SplitElementTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mNewLeftNode)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SplitElementTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNewLeftNode)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_ADDREF_INHERITED(SplitElementTxn, EditTxn)
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NS_IMPL_RELEASE_INHERITED(SplitElementTxn, EditTxn)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitElementTxn)
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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NS_IMETHODIMP SplitElementTxn::Init(nsEditor *aEditor,
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nsINode *aNode,
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int32_t aOffset)
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{
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NS_ASSERTION(aEditor && aNode, "bad args");
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if (!aEditor || !aNode) { return NS_ERROR_NOT_INITIALIZED; }
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mEditor = aEditor;
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mExistingRightNode = do_QueryInterface(aNode);
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mOffset = aOffset;
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return NS_OK;
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}
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NS_IMETHODIMP SplitElementTxn::DoTransaction(void)
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{
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#ifdef DEBUG
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if (gNoisy)
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{
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printf("%p Do Split of node %p offset %d\n",
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static_cast<void*>(this),
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static_cast<void*>(mExistingRightNode.get()),
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mOffset);
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}
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#endif
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NS_ASSERTION(mExistingRightNode && mEditor, "bad state");
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if (!mExistingRightNode || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
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// create a new node
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ErrorResult rv;
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mNewLeftNode = mExistingRightNode->CloneNode(false, rv);
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NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
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NS_ASSERTION(mNewLeftNode, "could not create element.");
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NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NULL_POINTER);
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mEditor->MarkNodeDirty(mExistingRightNode);
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#ifdef DEBUG
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if (gNoisy)
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{
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printf(" created left node = %p\n",
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static_cast<void*>(mNewLeftNode.get()));
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}
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#endif
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// get the parent node
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mParent = mExistingRightNode->GetParentNode();
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NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
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// insert the new node
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nsresult result = mEditor->SplitNodeImpl(mExistingRightNode->AsDOMNode(),
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mOffset,
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mNewLeftNode->AsDOMNode(),
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mParent->AsDOMNode());
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NS_ENSURE_SUCCESS(result, result);
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if (mNewLeftNode) {
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bool bAdjustSelection;
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mEditor->ShouldTxnSetSelection(&bAdjustSelection);
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if (bAdjustSelection)
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{
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nsCOMPtr<nsISelection> selection;
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result = mEditor->GetSelection(getter_AddRefs(selection));
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NS_ENSURE_SUCCESS(result, result);
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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result = selection->Collapse(mNewLeftNode->AsDOMNode(), mOffset);
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}
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else
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{
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// do nothing - dom range gravity will adjust selection
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}
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}
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return result;
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}
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NS_IMETHODIMP SplitElementTxn::UndoTransaction(void)
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{
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#ifdef DEBUG
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if (gNoisy) {
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printf("%p Undo Split of existing node %p and new node %p offset %d\n",
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static_cast<void*>(this),
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static_cast<void*>(mExistingRightNode.get()),
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static_cast<void*>(mNewLeftNode.get()),
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mOffset);
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}
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#endif
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NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
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if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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// this assumes Do inserted the new node in front of the prior existing node
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nsresult result = mEditor->JoinNodesImpl(mExistingRightNode->AsDOMNode(),
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mNewLeftNode->AsDOMNode(),
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mParent->AsDOMNode(),
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false);
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#ifdef DEBUG
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if (gNoisy)
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{
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printf("** after join left child node %p into right node %p\n",
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static_cast<void*>(mNewLeftNode.get()),
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static_cast<void*>(mExistingRightNode.get()));
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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if (NS_SUCCEEDED(result))
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{
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if (gNoisy)
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{
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printf(" left node = %p removed\n",
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static_cast<void*>(mNewLeftNode.get()));
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}
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}
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#endif
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return result;
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}
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/* redo cannot simply resplit the right node, because subsequent transactions
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* on the redo stack may depend on the left node existing in its previous state.
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*/
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NS_IMETHODIMP SplitElementTxn::RedoTransaction(void)
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{
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NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
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if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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#ifdef DEBUG
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if (gNoisy) {
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printf("%p Redo Split of existing node %p and new node %p offset %d\n",
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static_cast<void*>(this),
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static_cast<void*>(mExistingRightNode.get()),
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static_cast<void*>(mNewLeftNode.get()),
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mOffset);
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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#endif
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// first, massage the existing node so it is in its post-split state
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nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mExistingRightNode);
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if (rightNodeAsText)
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{
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nsresult result = rightNodeAsText->DeleteData(0, mOffset);
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NS_ENSURE_SUCCESS(result, result);
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#ifdef DEBUG
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if (gNoisy)
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{
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printf("** after delete of text in right text node %p offset %d\n",
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static_cast<void*>(rightNodeAsText.get()),
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mOffset);
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mEditor->DebugDumpContent(); // DEBUG
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}
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#endif
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}
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else
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{
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nsCOMPtr<nsINode> child = mExistingRightNode->GetFirstChild();
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for (int32_t i=0; i<mOffset; i++)
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{
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if (!child) {return NS_ERROR_NULL_POINTER;}
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ErrorResult rv;
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mExistingRightNode->RemoveChild(*child, rv);
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if (NS_SUCCEEDED(rv.ErrorCode()))
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{
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mNewLeftNode->AppendChild(*child, rv);
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NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
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#ifdef DEBUG
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if (gNoisy)
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{
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printf("** move child node %p from right node %p to left node %p\n",
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static_cast<void*>(child),
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static_cast<void*>(mExistingRightNode.get()),
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static_cast<void*>(mNewLeftNode.get()));
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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#endif
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}
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child = child->GetNextSibling();
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}
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}
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// second, re-insert the left node into the tree
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ErrorResult rv;
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mParent->InsertBefore(*mNewLeftNode, mExistingRightNode, rv);
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#ifdef DEBUG
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if (gNoisy)
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{
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printf("** reinsert left child node %p before right node %p\n",
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static_cast<void*>(mNewLeftNode.get()),
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static_cast<void*>(mExistingRightNode.get()));
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if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
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}
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#endif
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return rv.ErrorCode();
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}
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NS_IMETHODIMP SplitElementTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("SplitElementTxn");
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return NS_OK;
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}
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NS_IMETHODIMP SplitElementTxn::GetNewNode(nsINode **aNewNode)
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{
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NS_ENSURE_TRUE(aNewNode, NS_ERROR_NULL_POINTER);
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NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NOT_INITIALIZED);
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*aNewNode = mNewLeftNode;
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NS_ADDREF(*aNewNode);
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return NS_OK;
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}
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