gecko-dev/editor/libeditor/PlaceholderTxn.h

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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 AggregatePlaceholderTxn_h__
#define AggregatePlaceholderTxn_h__
#include "EditAggregateTxn.h"
#include "nsEditorUtils.h"
#include "nsIAbsorbingTransaction.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsWeakPtr.h"
#include "nsWeakReference.h"
#include "nsAutoPtr.h"
namespace mozilla {
namespace dom {
class IMETextTxn;
} // namespace dom
} // namespace mozilla
/**
* 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 PlaceholderTxn : public EditAggregateTxn,
public nsIAbsorbingTransaction,
public nsSupportsWeakReference
{
public:
NS_DECL_ISUPPORTS_INHERITED
PlaceholderTxn();
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PlaceholderTxn, EditAggregateTxn)
// ------------ EditAggregateTxn -----------------------
NS_DECL_EDITTXN
NS_IMETHOD RedoTransaction() override;
NS_IMETHOD Merge(nsITransaction *aTransaction, bool *aDidMerge) override;
// ------------ nsIAbsorbingTransaction -----------------------
NS_IMETHOD Init(nsIAtom* aName, nsSelectionState* aSelState,
nsEditor* aEditor) override;
NS_IMETHOD GetTxnName(nsIAtom **aName) override;
NS_IMETHOD StartSelectionEquals(nsSelectionState *aSelState, bool *aResult) override;
NS_IMETHOD EndPlaceHolderBatch() override;
NS_IMETHOD ForwardEndBatchTo(nsIAbsorbingTransaction *aForwardingAddress) override;
NS_IMETHOD Commit() override;
nsresult RememberEndingSelection();
protected:
virtual ~PlaceholderTxn();
/** the presentation shell, which we'll need to get the selection */
bool mAbsorb; // do we auto absorb any and all transaction?
nsWeakPtr mForwarding;
mozilla::dom::IMETextTxn *mIMETextTxn; // first IME txn in this placeholder - used for IME merging
// non-owning for now - can't nsCOMPtr it due to broken transaction interfaces
bool mCommitted; // do we stop auto absorbing any matching placeholder txns?
// these next two members store the state of the selection in a safe way.
// selection at the start of the txn is stored, as is the selection at the end.
// This is so that UndoTransaction() and RedoTransaction() can restore the
// selection properly.
nsAutoPtr<nsSelectionState> mStartSel; // use a pointer because this is constructed before we exist
nsSelectionState mEndSel;
nsEditor* mEditor; /** the editor for this transaction */
};
#endif