forked from mirrors/gecko-dev
d296624690
Backed out changeset 28bedb658af4 (bug 1340498) Backed out changeset f950a2310e26 (bug 1340498) Backed out changeset 5fcd31c65fe0 (bug 1340498) Backed out changeset 515bb5e24dd7 (bug 1340498) Backed out changeset 79a8619bd3e2 (bug 1340498)
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "mozilla/Attributes.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsTArray.h"
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#include "nsCOMPtr.h"
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class nsRange;
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class nsINode;
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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> mStartContainer;
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nsCOMPtr<nsINode> mEndContainer;
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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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