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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/. */
#ifndef PlaceholderTransaction_h
#define PlaceholderTransaction_h
#include "EditAggregateTransaction.h"
#include "mozilla/EditorUtils.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WeakPtr.h"
#include "nsIAbsorbingTransaction.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsWeakPtr.h"
#include "nsWeakReference.h"
namespace mozilla {
class CompositionTransaction;
/**
* An aggregate transaction that knows how to absorb all subsequent
* transactions with the same name. This transaction does not "Do" anything.
* But it absorbs other transactions via merge, and can undo/redo the
* transactions it has absorbed.
*/
class PlaceholderTransaction final
: public EditAggregateTransaction
, public nsIAbsorbingTransaction
, public SupportsWeakPtr<PlaceholderTransaction>
{
public:
MOZ_DECLARE_WEAKREFERENCE_TYPENAME(PlaceholderTransaction)
NS_DECL_ISUPPORTS_INHERITED
PlaceholderTransaction(EditorBase& aEditorBase, nsIAtom* aName,
UniquePtr<SelectionState> aSelState);
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PlaceholderTransaction,
EditAggregateTransaction)
// ------------ EditAggregateTransaction -----------------------
NS_DECL_EDITTRANSACTIONBASE
NS_IMETHOD RedoTransaction() override;
NS_IMETHOD Merge(nsITransaction* aTransaction, bool* aDidMerge) override;
// ------------ nsIAbsorbingTransaction -----------------------
NS_IMETHOD GetTxnName(nsIAtom** aName) override;
NS_IMETHOD StartSelectionEquals(SelectionState* aSelState,
bool* aResult) override;
NS_IMETHOD EndPlaceHolderBatch() override;
NS_IMETHOD ForwardEndBatchTo(
nsIAbsorbingTransaction* aForwardingAddress) override;
NS_IMETHOD Commit() override;
NS_IMETHOD_(PlaceholderTransaction*) AsPlaceholderTransaction() override
{
return this;
}
nsresult RememberEndingSelection();
protected:
virtual ~PlaceholderTransaction();
// Do we auto absorb any and all transaction?
bool mAbsorb;
nsWeakPtr mForwarding;
// First IME txn in this placeholder - used for IME merging.
mozilla::CompositionTransaction* mCompositionTransaction;
// Do we stop auto absorbing any matching placeholder transactions?
bool mCommitted;
// These next two members store the state of the selection in a safe way.
// Selection at the start of the transaction is stored, as is the selection
// at the end. This is so that UndoTransaction() and RedoTransaction() can
// restore the selection properly.
// Use a pointer because this is constructed before we exist.
UniquePtr<SelectionState> mStartSel;
SelectionState mEndSel;
// The editor for this transaction.
RefPtr<EditorBase> mEditorBase;
};
} // namespace mozilla
#endif // #ifndef PlaceholderTransaction_h
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