1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/editor/libeditor/base/DeleteRangeTxn.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,231 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "DeleteNodeTxn.h"
1.10 +#include "DeleteRangeTxn.h"
1.11 +#include "DeleteTextTxn.h"
1.12 +#include "mozilla/Assertions.h"
1.13 +#include "mozilla/dom/Selection.h"
1.14 +#include "mozilla/mozalloc.h"
1.15 +#include "nsCOMPtr.h"
1.16 +#include "nsDebug.h"
1.17 +#include "nsEditor.h"
1.18 +#include "nsError.h"
1.19 +#include "nsIContent.h"
1.20 +#include "nsIContentIterator.h"
1.21 +#include "nsIDOMCharacterData.h"
1.22 +#include "nsINode.h"
1.23 +#include "nsAString.h"
1.24 +
1.25 +class nsIDOMRange;
1.26 +
1.27 +using namespace mozilla;
1.28 +using namespace mozilla::dom;
1.29 +
1.30 +// note that aEditor is not refcounted
1.31 +DeleteRangeTxn::DeleteRangeTxn()
1.32 + : EditAggregateTxn(),
1.33 + mRange(),
1.34 + mEditor(nullptr),
1.35 + mRangeUpdater(nullptr)
1.36 +{
1.37 +}
1.38 +
1.39 +NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteRangeTxn, EditAggregateTxn,
1.40 + mRange)
1.41 +
1.42 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteRangeTxn)
1.43 +NS_INTERFACE_MAP_END_INHERITING(EditAggregateTxn)
1.44 +
1.45 +nsresult
1.46 +DeleteRangeTxn::Init(nsEditor* aEditor,
1.47 + nsRange* aRange,
1.48 + nsRangeUpdater* aRangeUpdater)
1.49 +{
1.50 + MOZ_ASSERT(aEditor && aRange);
1.51 +
1.52 + mEditor = aEditor;
1.53 + mRange = aRange->CloneRange();
1.54 + mRangeUpdater = aRangeUpdater;
1.55 +
1.56 + NS_ENSURE_TRUE(mEditor->IsModifiableNode(mRange->GetStartParent()),
1.57 + NS_ERROR_FAILURE);
1.58 + NS_ENSURE_TRUE(mEditor->IsModifiableNode(mRange->GetEndParent()),
1.59 + NS_ERROR_FAILURE);
1.60 + NS_ENSURE_TRUE(mEditor->IsModifiableNode(mRange->GetCommonAncestor()),
1.61 + NS_ERROR_FAILURE);
1.62 +
1.63 + return NS_OK;
1.64 +}
1.65 +
1.66 +NS_IMETHODIMP
1.67 +DeleteRangeTxn::DoTransaction()
1.68 +{
1.69 + MOZ_ASSERT(mRange && mEditor);
1.70 + nsresult res;
1.71 +
1.72 + // build the child transactions
1.73 + nsCOMPtr<nsINode> startParent = mRange->GetStartParent();
1.74 + int32_t startOffset = mRange->StartOffset();
1.75 + nsCOMPtr<nsINode> endParent = mRange->GetEndParent();
1.76 + int32_t endOffset = mRange->EndOffset();
1.77 + MOZ_ASSERT(startParent && endParent);
1.78 +
1.79 + if (startParent == endParent) {
1.80 + // the selection begins and ends in the same node
1.81 + res = CreateTxnsToDeleteBetween(startParent, startOffset, endOffset);
1.82 + NS_ENSURE_SUCCESS(res, res);
1.83 + } else {
1.84 + // the selection ends in a different node from where it started. delete
1.85 + // the relevant content in the start node
1.86 + res = CreateTxnsToDeleteContent(startParent, startOffset, nsIEditor::eNext);
1.87 + NS_ENSURE_SUCCESS(res, res);
1.88 + // delete the intervening nodes
1.89 + res = CreateTxnsToDeleteNodesBetween();
1.90 + NS_ENSURE_SUCCESS(res, res);
1.91 + // delete the relevant content in the end node
1.92 + res = CreateTxnsToDeleteContent(endParent, endOffset, nsIEditor::ePrevious);
1.93 + NS_ENSURE_SUCCESS(res, res);
1.94 + }
1.95 +
1.96 + // if we've successfully built this aggregate transaction, then do it.
1.97 + res = EditAggregateTxn::DoTransaction();
1.98 + NS_ENSURE_SUCCESS(res, res);
1.99 +
1.100 + // only set selection to deletion point if editor gives permission
1.101 + bool bAdjustSelection;
1.102 + mEditor->ShouldTxnSetSelection(&bAdjustSelection);
1.103 + if (bAdjustSelection) {
1.104 + nsRefPtr<Selection> selection = mEditor->GetSelection();
1.105 + NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
1.106 + res = selection->Collapse(startParent, startOffset);
1.107 + NS_ENSURE_SUCCESS(res, res);
1.108 + }
1.109 + // else do nothing - dom range gravity will adjust selection
1.110 +
1.111 + return NS_OK;
1.112 +}
1.113 +
1.114 +NS_IMETHODIMP
1.115 +DeleteRangeTxn::UndoTransaction()
1.116 +{
1.117 + MOZ_ASSERT(mRange && mEditor);
1.118 +
1.119 + return EditAggregateTxn::UndoTransaction();
1.120 +}
1.121 +
1.122 +NS_IMETHODIMP
1.123 +DeleteRangeTxn::RedoTransaction()
1.124 +{
1.125 + MOZ_ASSERT(mRange && mEditor);
1.126 +
1.127 + return EditAggregateTxn::RedoTransaction();
1.128 +}
1.129 +
1.130 +NS_IMETHODIMP
1.131 +DeleteRangeTxn::GetTxnDescription(nsAString& aString)
1.132 +{
1.133 + aString.AssignLiteral("DeleteRangeTxn");
1.134 + return NS_OK;
1.135 +}
1.136 +
1.137 +nsresult
1.138 +DeleteRangeTxn::CreateTxnsToDeleteBetween(nsINode* aNode,
1.139 + int32_t aStartOffset,
1.140 + int32_t aEndOffset)
1.141 +{
1.142 + // see what kind of node we have
1.143 + if (aNode->IsNodeOfType(nsINode::eDATA_NODE)) {
1.144 + // if the node is a chardata node, then delete chardata content
1.145 + nsRefPtr<DeleteTextTxn> txn = new DeleteTextTxn();
1.146 +
1.147 + int32_t numToDel;
1.148 + if (aStartOffset == aEndOffset) {
1.149 + numToDel = 1;
1.150 + } else {
1.151 + numToDel = aEndOffset - aStartOffset;
1.152 + }
1.153 +
1.154 + nsCOMPtr<nsIDOMCharacterData> charDataNode = do_QueryInterface(aNode);
1.155 + nsresult res = txn->Init(mEditor, charDataNode, aStartOffset, numToDel,
1.156 + mRangeUpdater);
1.157 + NS_ENSURE_SUCCESS(res, res);
1.158 +
1.159 + AppendChild(txn);
1.160 + return NS_OK;
1.161 + }
1.162 +
1.163 + nsCOMPtr<nsIContent> child = aNode->GetChildAt(aStartOffset);
1.164 + NS_ENSURE_STATE(child);
1.165 +
1.166 + nsresult res = NS_OK;
1.167 + for (int32_t i = aStartOffset; i < aEndOffset; ++i) {
1.168 + nsRefPtr<DeleteNodeTxn> txn = new DeleteNodeTxn();
1.169 + res = txn->Init(mEditor, child, mRangeUpdater);
1.170 + if (NS_SUCCEEDED(res)) {
1.171 + AppendChild(txn);
1.172 + }
1.173 +
1.174 + child = child->GetNextSibling();
1.175 + }
1.176 +
1.177 + NS_ENSURE_SUCCESS(res, res);
1.178 + return NS_OK;
1.179 +}
1.180 +
1.181 +nsresult
1.182 +DeleteRangeTxn::CreateTxnsToDeleteContent(nsINode* aNode,
1.183 + int32_t aOffset,
1.184 + nsIEditor::EDirection aAction)
1.185 +{
1.186 + // see what kind of node we have
1.187 + if (aNode->IsNodeOfType(nsINode::eDATA_NODE)) {
1.188 + // if the node is a chardata node, then delete chardata content
1.189 + uint32_t start, numToDelete;
1.190 + if (nsIEditor::eNext == aAction) {
1.191 + start = aOffset;
1.192 + numToDelete = aNode->Length() - aOffset;
1.193 + } else {
1.194 + start = 0;
1.195 + numToDelete = aOffset;
1.196 + }
1.197 +
1.198 + if (numToDelete) {
1.199 + nsRefPtr<DeleteTextTxn> txn = new DeleteTextTxn();
1.200 +
1.201 + nsCOMPtr<nsIDOMCharacterData> charDataNode = do_QueryInterface(aNode);
1.202 + nsresult res = txn->Init(mEditor, charDataNode, start, numToDelete,
1.203 + mRangeUpdater);
1.204 + NS_ENSURE_SUCCESS(res, res);
1.205 +
1.206 + AppendChild(txn);
1.207 + }
1.208 + }
1.209 +
1.210 + return NS_OK;
1.211 +}
1.212 +
1.213 +nsresult
1.214 +DeleteRangeTxn::CreateTxnsToDeleteNodesBetween()
1.215 +{
1.216 + nsCOMPtr<nsIContentIterator> iter = NS_NewContentSubtreeIterator();
1.217 +
1.218 + nsresult res = iter->Init(mRange);
1.219 + NS_ENSURE_SUCCESS(res, res);
1.220 +
1.221 + while (!iter->IsDone()) {
1.222 + nsCOMPtr<nsINode> node = iter->GetCurrentNode();
1.223 + NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
1.224 +
1.225 + nsRefPtr<DeleteNodeTxn> txn = new DeleteNodeTxn();
1.226 +
1.227 + res = txn->Init(mEditor, node, mRangeUpdater);
1.228 + NS_ENSURE_SUCCESS(res, res);
1.229 + AppendChild(txn);
1.230 +
1.231 + iter->Next();
1.232 + }
1.233 + return NS_OK;
1.234 +}
