summaryrefslogtreecommitdiffstats
path: root/editor/libeditor/JoinNodesTransaction.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'editor/libeditor/JoinNodesTransaction.cpp')
-rw-r--r--editor/libeditor/JoinNodesTransaction.cpp212
1 files changed, 212 insertions, 0 deletions
diff --git a/editor/libeditor/JoinNodesTransaction.cpp b/editor/libeditor/JoinNodesTransaction.cpp
new file mode 100644
index 0000000000..15891938c8
--- /dev/null
+++ b/editor/libeditor/JoinNodesTransaction.cpp
@@ -0,0 +1,212 @@
+/* -*- 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 "JoinNodesTransaction.h"
+
+#include "EditorDOMPoint.h" // for EditorDOMPoint, etc.
+#include "HTMLEditHelpers.h" // for SplitNodeResult
+#include "JoinSplitNodeDirection.h" // JoinNodesDirection
+#include "HTMLEditor.h" // for HTMLEditor
+#include "HTMLEditorInlines.h"
+#include "HTMLEditUtils.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/ToString.h"
+#include "mozilla/dom/Text.h"
+
+#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 "nsISupportsImpl.h" // for QueryInterface, etc.
+
+namespace mozilla {
+
+using namespace dom;
+
+// static
+already_AddRefed<JoinNodesTransaction> JoinNodesTransaction::MaybeCreate(
+ HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
+ nsIContent& aRightContent) {
+ RefPtr<JoinNodesTransaction> transaction =
+ new JoinNodesTransaction(aHTMLEditor, aLeftContent, aRightContent);
+ if (NS_WARN_IF(!transaction->CanDoIt())) {
+ return nullptr;
+ }
+ return transaction.forget();
+}
+
+JoinNodesTransaction::JoinNodesTransaction(HTMLEditor& aHTMLEditor,
+ nsIContent& aLeftContent,
+ nsIContent& aRightContent)
+ : mHTMLEditor(&aHTMLEditor),
+ mRemovedContent(aHTMLEditor.GetJoinNodesDirection() ==
+ JoinNodesDirection::LeftNodeIntoRightNode
+ ? &aLeftContent
+ : &aRightContent),
+ mKeepingContent(aHTMLEditor.GetJoinNodesDirection() ==
+ JoinNodesDirection::LeftNodeIntoRightNode
+ ? &aRightContent
+ : &aLeftContent) {
+ // printf("JoinNodesTransaction size: %zu\n", sizeof(JoinNodesTransaction));
+ static_assert(sizeof(JoinNodesTransaction) <= 64,
+ "Transaction classes may be created a lot and may be alive "
+ "long so that keep the foot print smaller as far as possible");
+}
+
+std::ostream& operator<<(std::ostream& aStream,
+ const JoinNodesTransaction& aTransaction) {
+ aStream << "{ mParentNode=" << aTransaction.mParentNode.get();
+ if (aTransaction.mParentNode) {
+ aStream << " (" << *aTransaction.mParentNode << ")";
+ }
+ aStream << ", mRemovedContent=" << aTransaction.mRemovedContent.get();
+ if (aTransaction.mRemovedContent) {
+ aStream << " (" << *aTransaction.mRemovedContent << ")";
+ }
+ aStream << ", mKeepingContent=" << aTransaction.mKeepingContent.get();
+ if (aTransaction.mKeepingContent) {
+ aStream << " (" << *aTransaction.mKeepingContent << ")";
+ }
+ aStream << ", mJoinedOffset=" << aTransaction.mJoinedOffset
+ << ", mHTMLEditor=" << aTransaction.mHTMLEditor.get()
+ << ", GetJoinNodesDirection()="
+ << aTransaction.GetJoinNodesDirection() << " }";
+ return aStream;
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinNodesTransaction, EditTransactionBase,
+ mHTMLEditor, mParentNode, mRemovedContent,
+ mKeepingContent)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodesTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+SplitNodeDirection JoinNodesTransaction::GetSplitNodeDirection() const {
+ return MOZ_LIKELY(mHTMLEditor) ? mHTMLEditor->GetSplitNodeDirection()
+ : SplitNodeDirection::LeftNodeIsNewOne;
+}
+
+JoinNodesDirection JoinNodesTransaction::GetJoinNodesDirection() const {
+ return MOZ_LIKELY(mHTMLEditor) ? mHTMLEditor->GetJoinNodesDirection()
+ : JoinNodesDirection::LeftNodeIntoRightNode;
+}
+
+bool JoinNodesTransaction::CanDoIt() const {
+ if (NS_WARN_IF(!mKeepingContent) || NS_WARN_IF(!mRemovedContent) ||
+ NS_WARN_IF(!mHTMLEditor) ||
+ NS_WARN_IF(mRemovedContent->IsBeingRemoved()) ||
+ !mKeepingContent->IsInComposedDoc()) {
+ return false;
+ }
+ return HTMLEditUtils::IsRemovableFromParentNode(*mRemovedContent);
+}
+
+// After DoTransaction() and RedoTransaction(), the left node is removed from
+// the content tree and right node remains.
+NS_IMETHODIMP JoinNodesTransaction::DoTransaction() {
+ MOZ_LOG(GetLogModule(), LogLevel::Info,
+ ("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
+ ToString(*this).c_str()));
+
+ return DoTransactionInternal(RedoingTransaction::No);
+}
+
+nsresult JoinNodesTransaction::DoTransactionInternal(
+ RedoingTransaction aRedoingTransaction) {
+ if (MOZ_UNLIKELY(NS_WARN_IF(!mHTMLEditor) || NS_WARN_IF(!mKeepingContent) ||
+ NS_WARN_IF(!mRemovedContent) ||
+ NS_WARN_IF(mRemovedContent->IsBeingRemoved()))) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ nsINode* removingContentParentNode = mRemovedContent->GetParentNode();
+ if (MOZ_UNLIKELY(NS_WARN_IF(!removingContentParentNode))) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // Verify that the joining content nodes have the same parent
+ if (MOZ_UNLIKELY(removingContentParentNode !=
+ mKeepingContent->GetParentNode())) {
+ NS_ASSERTION(false, "Nodes do not have same parent");
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // Set this instance's mParentNode. Other methods will see a non-null
+ // mParentNode and know all is well
+ mParentNode = removingContentParentNode;
+ // For now, setting mJoinedOffset to removed content length so that
+ // CreateJoinedPoint returns a point in mKeepingContent whose offset is
+ // the result if all content in mRemovedContent are moved to start or end of
+ // mKeepingContent without any intervation. The offset will be adjusted
+ // below.
+ mJoinedOffset =
+ GetJoinNodesDirection() == JoinNodesDirection::LeftNodeIntoRightNode
+ ? mRemovedContent->Length()
+ : mKeepingContent->Length();
+
+ const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+ const OwningNonNull<nsIContent> removingContent = *mRemovedContent;
+ const OwningNonNull<nsIContent> keepingContent = *mKeepingContent;
+ nsresult rv;
+ // Let's try to get actual joined point with the tacker.
+ EditorDOMPoint joinNodesPoint =
+ GetJoinNodesDirection() == JoinNodesDirection::LeftNodeIntoRightNode
+ ? EditorDOMPoint(keepingContent, 0u)
+ : EditorDOMPoint::AtEndOf(keepingContent);
+ {
+ AutoTrackDOMPoint trackJoinNodePoint(htmlEditor->RangeUpdaterRef(),
+ &joinNodesPoint);
+ rv = htmlEditor->DoJoinNodes(keepingContent, removingContent,
+ GetJoinNodesDirection());
+ NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "HTMLEditor::DoJoinNodes() failed");
+ }
+ // Adjust join node offset to the actual offset where the original first
+ // content of the right node is.
+ mJoinedOffset = joinNodesPoint.Offset();
+
+ if (aRedoingTransaction == RedoingTransaction::No) {
+ htmlEditor->DidJoinNodesTransaction(*this, rv);
+ }
+
+ return rv;
+}
+
+// XXX: What if instead of split, we just deleted the unneeded children of
+// mRight and re-inserted mLeft?
+NS_IMETHODIMP JoinNodesTransaction::UndoTransaction() {
+ MOZ_LOG(GetLogModule(), LogLevel::Info,
+ ("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
+ ToString(*this).c_str()));
+
+ if (NS_WARN_IF(!mParentNode) || NS_WARN_IF(!mKeepingContent) ||
+ NS_WARN_IF(!mRemovedContent) || NS_WARN_IF(!mHTMLEditor)) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+ const OwningNonNull<nsIContent> removedContent = *mRemovedContent;
+
+ Result<SplitNodeResult, nsresult> splitNodeResult =
+ htmlEditor->DoSplitNode(CreateJoinedPoint<EditorDOMPoint>(),
+ removedContent, GetSplitNodeDirection());
+ if (MOZ_UNLIKELY(splitNodeResult.isErr())) {
+ NS_WARNING("HTMLEditor::DoSplitNode() failed");
+ return splitNodeResult.unwrapErr();
+ }
+ // When adding caret suggestion to SplitNodeResult, here didn't change
+ // selection so that just ignore it.
+ splitNodeResult.inspect().IgnoreCaretPointSuggestion();
+ return NS_OK;
+}
+
+NS_IMETHODIMP JoinNodesTransaction::RedoTransaction() {
+ MOZ_LOG(GetLogModule(), LogLevel::Info,
+ ("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
+ ToString(*this).c_str()));
+ return DoTransactionInternal(RedoingTransaction::Yes);
+}
+
+} // namespace mozilla