mirror of
https://github.com/mozilla/gecko-dev.git
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245 lines
7.5 KiB
C++
245 lines
7.5 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 "SplitElementTxn.h"
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#include "nsEditor.h"
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#include "nsIDOMNode.h"
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#include "nsISelection.h"
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#include "nsIDOMCharacterData.h"
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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_CLASS(SplitElementTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SplitElementTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(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_NSCOMPTR(mParent)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(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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nsIDOMNode *aNode,
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PRInt32 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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nsresult result = mExistingRightNode->CloneNode(false, 1, getter_AddRefs(mNewLeftNode));
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NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
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NS_ENSURE_SUCCESS(result, result);
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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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result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
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NS_ENSURE_SUCCESS(result, result);
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NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
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// insert the new node
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result = mEditor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
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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, 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, mNewLeftNode, mParent, 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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nsresult result;
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nsCOMPtr<nsIDOMNode>resultNode;
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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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result = rightNodeAsText->DeleteData(0, mOffset);
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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<nsIDOMNode>child;
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nsCOMPtr<nsIDOMNode>nextSibling;
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result = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
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PRInt32 i;
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for (i=0; i<mOffset; i++)
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{
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if (NS_FAILED(result)) {return result;}
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if (!child) {return NS_ERROR_NULL_POINTER;}
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child->GetNextSibling(getter_AddRefs(nextSibling));
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result = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
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if (NS_SUCCEEDED(result))
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{
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result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
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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.get()),
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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 = do_QueryInterface(nextSibling);
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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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result = mParent->InsertBefore(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
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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 result;
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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(nsIDOMNode **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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