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ff61891772
Having two classes in the inheritance chain inherit from SupportsWeakPtr now won't compile, but you can use WeakPtr<Derived> when any base class inherits from SupportsWeakPtr. Differential Revision: https://phabricator.services.mozilla.com/D83674
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef PlaceholderTransaction_h
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#define PlaceholderTransaction_h
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#include "EditAggregateTransaction.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/SelectionState.h"
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#include "mozilla/WeakPtr.h"
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namespace mozilla {
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class EditorBase;
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/**
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* An aggregate transaction that knows how to absorb all subsequent
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* transactions with the same name. This transaction does not "Do" anything.
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* But it absorbs other transactions via merge, and can undo/redo the
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* transactions it has absorbed.
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*/
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class PlaceholderTransaction final : public EditAggregateTransaction,
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public SupportsWeakPtr {
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protected:
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PlaceholderTransaction(EditorBase& aEditorBase, nsStaticAtom& aName,
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Maybe<SelectionState>&& aSelState);
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public:
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/**
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* Creates a placeholder transaction. This never returns nullptr.
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*
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* @param aEditorBase The editor.
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* @param aName The name of creating transaction.
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* @param aSelState The selection state of aEditorBase.
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*/
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static already_AddRefed<PlaceholderTransaction> Create(
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EditorBase& aEditorBase, nsStaticAtom& aName,
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Maybe<SelectionState>&& aSelState) {
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// Make sure to move aSelState into a local variable to null out the
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// original Maybe<SelectionState> variable.
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Maybe<SelectionState> selState(std::move(aSelState));
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RefPtr<PlaceholderTransaction> transaction =
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new PlaceholderTransaction(aEditorBase, aName, std::move(selState));
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return transaction.forget();
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}
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PlaceholderTransaction,
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EditAggregateTransaction)
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// ------------ EditAggregateTransaction -----------------------
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NS_DECL_EDITTRANSACTIONBASE
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NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(PlaceholderTransaction)
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MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
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NS_IMETHOD Merge(nsITransaction* aTransaction, bool* aDidMerge) override;
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bool StartSelectionEquals(SelectionState& aSelectionState);
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nsresult EndPlaceHolderBatch();
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void ForwardEndBatchTo(PlaceholderTransaction& aForwardingTransaction) {
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mForwardingTransaction = &aForwardingTransaction;
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}
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void Commit() { mCommitted = true; }
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nsresult RememberEndingSelection();
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protected:
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virtual ~PlaceholderTransaction() = default;
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// The editor for this transaction.
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RefPtr<EditorBase> mEditorBase;
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WeakPtr<PlaceholderTransaction> mForwardingTransaction;
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// First IME txn in this placeholder - used for IME merging.
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WeakPtr<CompositionTransaction> mCompositionTransaction;
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// These next two members store the state of the selection in a safe way.
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// Selection at the start of the transaction is stored, as is the selection
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// at the end. This is so that UndoTransaction() and RedoTransaction() can
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// restore the selection properly.
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SelectionState mStartSel;
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SelectionState mEndSel;
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// Do we auto absorb any and all transaction?
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bool mAbsorb;
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// Do we stop auto absorbing any matching placeholder transactions?
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bool mCommitted;
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};
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} // namespace mozilla
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#endif // #ifndef PlaceholderTransaction_h
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