58 lines
2.0 KiB
C++
58 lines
2.0 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 mozilla_SelectionChangeListener_h_
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#define mozilla_SelectionChangeListener_h_
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#include "nsISelectionListener.h"
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#include "nsISelectionPrivate.h"
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#include "mozilla/Attributes.h"
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namespace mozilla {
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namespace dom {
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class SelectionChangeListener final : public nsISelectionListener
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{
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public:
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// SelectionChangeListener has to participate in cycle collection because
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// it holds strong references to nsINodes in its mOldRanges array.
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(SelectionChangeListener)
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NS_DECL_NSISELECTIONLISTENER
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// This field is used to keep track of the ranges which were present in the
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// selection when the selectionchange event was previously fired. This allows
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// for the selectionchange event to only be fired when a selection is actually
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// changed.
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struct RawRangeData
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{
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// These properties are not void*s to avoid the potential situation where the
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// nsINode is freed, and a new nsINode is allocated with the same address, which
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// could potentially break the comparison logic. In reality, this is extremely
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// unlikely to occur (potentially impossible), but these nsCOMPtrs are safer.
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// They are never dereferenced.
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nsCOMPtr<nsINode> mStartParent;
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nsCOMPtr<nsINode> mEndParent;
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// XXX These are int32_ts on nsRange, but uint32_ts in the return value
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// of GetStart_, so I use uint32_ts here. See bug 1194256.
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uint32_t mStartOffset;
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uint32_t mEndOffset;
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explicit RawRangeData(const nsRange* aRange);
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bool Equals(const nsRange* aRange);
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};
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private:
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nsTArray<RawRangeData> mOldRanges;
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~SelectionChangeListener() {}
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_SelectionChangeListener_h_
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