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/* -*- 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 "DeleteRangeTransaction.h"
#include "DeleteNodeTransaction.h"
#include "DeleteTextTransaction.h"
#include "mozilla/Assertions.h"
#include "mozilla/EditorBase.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/mozalloc.h"
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "nsIDOMCharacterData.h"
#include "nsINode.h"
#include "nsAString.h"
namespace mozilla {
using namespace dom;
// note that aEditorBase is not refcounted
DeleteRangeTransaction::DeleteRangeTransaction()
: mEditorBase(nullptr)
, mRangeUpdater(nullptr)
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteRangeTransaction,
EditAggregateTransaction,
mRange)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteRangeTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditAggregateTransaction)
nsresult
DeleteRangeTransaction::Init(EditorBase* aEditorBase,
nsRange* aRange,
RangeUpdater* aRangeUpdater)
{
MOZ_ASSERT(aEditorBase && aRange);
mEditorBase = aEditorBase;
mRange = aRange->CloneRange();
mRangeUpdater = aRangeUpdater;
NS_ENSURE_TRUE(mEditorBase->IsModifiableNode(mRange->GetStartParent()),
NS_ERROR_FAILURE);
NS_ENSURE_TRUE(mEditorBase->IsModifiableNode(mRange->GetEndParent()),
NS_ERROR_FAILURE);
NS_ENSURE_TRUE(mEditorBase->IsModifiableNode(mRange->GetCommonAncestor()),
NS_ERROR_FAILURE);
return NS_OK;
}
NS_IMETHODIMP
DeleteRangeTransaction::DoTransaction()
{
MOZ_ASSERT(mRange && mEditorBase);
// build the child transactions
nsCOMPtr<nsINode> startParent = mRange->GetStartParent();
int32_t startOffset = mRange->StartOffset();
nsCOMPtr<nsINode> endParent = mRange->GetEndParent();
int32_t endOffset = mRange->EndOffset();
MOZ_ASSERT(startParent && endParent);
if (startParent == endParent) {
// the selection begins and ends in the same node
nsresult rv =
CreateTxnsToDeleteBetween(startParent, startOffset, endOffset);
NS_ENSURE_SUCCESS(rv, rv);
} else {
// the selection ends in a different node from where it started. delete
// the relevant content in the start node
nsresult rv =
CreateTxnsToDeleteContent(startParent, startOffset, nsIEditor::eNext);
NS_ENSURE_SUCCESS(rv, rv);
// delete the intervening nodes
rv = CreateTxnsToDeleteNodesBetween();
NS_ENSURE_SUCCESS(rv, rv);
// delete the relevant content in the end node
rv = CreateTxnsToDeleteContent(endParent, endOffset, nsIEditor::ePrevious);
NS_ENSURE_SUCCESS(rv, rv);
}
// if we've successfully built this aggregate transaction, then do it.
nsresult rv = EditAggregateTransaction::DoTransaction();
NS_ENSURE_SUCCESS(rv, rv);
// only set selection to deletion point if editor gives permission
bool bAdjustSelection;
mEditorBase->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection) {
RefPtr<Selection> selection = mEditorBase->GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
rv = selection->Collapse(startParent, startOffset);
NS_ENSURE_SUCCESS(rv, rv);
}
// else do nothing - dom range gravity will adjust selection
return NS_OK;
}
NS_IMETHODIMP
DeleteRangeTransaction::UndoTransaction()
{
MOZ_ASSERT(mRange && mEditorBase);
return EditAggregateTransaction::UndoTransaction();
}
NS_IMETHODIMP
DeleteRangeTransaction::RedoTransaction()
{
MOZ_ASSERT(mRange && mEditorBase);
return EditAggregateTransaction::RedoTransaction();
}
NS_IMETHODIMP
DeleteRangeTransaction::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteRangeTransaction");
return NS_OK;
}
nsresult
DeleteRangeTransaction::CreateTxnsToDeleteBetween(nsINode* aNode,
int32_t aStartOffset,
int32_t aEndOffset)
{
// see what kind of node we have
if (aNode->IsNodeOfType(nsINode::eDATA_NODE)) {
// if the node is a chardata node, then delete chardata content
int32_t numToDel;
if (aStartOffset == aEndOffset) {
numToDel = 1;
} else {
numToDel = aEndOffset - aStartOffset;
}
RefPtr<nsGenericDOMDataNode> charDataNode =
static_cast<nsGenericDOMDataNode*>(aNode);
RefPtr<DeleteTextTransaction> transaction =
new DeleteTextTransaction(*mEditorBase, *charDataNode, aStartOffset,
numToDel, mRangeUpdater);
nsresult rv = transaction->Init();
NS_ENSURE_SUCCESS(rv, rv);
AppendChild(transaction);
return NS_OK;
}
nsCOMPtr<nsIContent> child = aNode->GetChildAt(aStartOffset);
NS_ENSURE_STATE(child);
// XXX This looks odd. Only when the last transaction causes error at
// calling Init(), the result becomes error. Otherwise, always NS_OK.
nsresult rv = NS_OK;
for (int32_t i = aStartOffset; i < aEndOffset; ++i) {
RefPtr<DeleteNodeTransaction> transaction = new DeleteNodeTransaction();
rv = transaction->Init(mEditorBase, child, mRangeUpdater);
if (NS_SUCCEEDED(rv)) {
AppendChild(transaction);
}
child = child->GetNextSibling();
}
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
DeleteRangeTransaction::CreateTxnsToDeleteContent(nsINode* aNode,
int32_t aOffset,
nsIEditor::EDirection aAction)
{
// see what kind of node we have
if (aNode->IsNodeOfType(nsINode::eDATA_NODE)) {
// if the node is a chardata node, then delete chardata content
uint32_t start, numToDelete;
if (nsIEditor::eNext == aAction) {
start = aOffset;
numToDelete = aNode->Length() - aOffset;
} else {
start = 0;
numToDelete = aOffset;
}
if (numToDelete) {
RefPtr<nsGenericDOMDataNode> dataNode =
static_cast<nsGenericDOMDataNode*>(aNode);
RefPtr<DeleteTextTransaction> transaction =
new DeleteTextTransaction(*mEditorBase, *dataNode, start, numToDelete,
mRangeUpdater);
nsresult rv = transaction->Init();
NS_ENSURE_SUCCESS(rv, rv);
AppendChild(transaction);
}
}
return NS_OK;
}
nsresult
DeleteRangeTransaction::CreateTxnsToDeleteNodesBetween()
{
nsCOMPtr<nsIContentIterator> iter = NS_NewContentSubtreeIterator();
nsresult rv = iter->Init(mRange);
NS_ENSURE_SUCCESS(rv, rv);
while (!iter->IsDone()) {
nsCOMPtr<nsINode> node = iter->GetCurrentNode();
NS_ENSURE_TRUE(node, NS_ERROR_NULL_POINTER);
RefPtr<DeleteNodeTransaction> transaction = new DeleteNodeTransaction();
rv = transaction->Init(mEditorBase, node, mRangeUpdater);
NS_ENSURE_SUCCESS(rv, rv);
AppendChild(transaction);
iter->Next();
}
return NS_OK;
}
} // namespace mozilla
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