зеркало из https://github.com/mozilla/gecko-dev.git
70 строки
2.4 KiB
C++
70 строки
2.4 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_SelectionChangeEventDispatcher_h
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#define mozilla_SelectionChangeEventDispatcher_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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#include "nsDirection.h"
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class nsINode;
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class nsRange;
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namespace mozilla {
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namespace dom {
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class Document;
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class Selection;
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} // namespace dom
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class SelectionChangeEventDispatcher final {
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public:
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// SelectionChangeEventDispatcher has to participate in cycle collection
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// because it holds strong references to nsINodes in its mOldRanges array.
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(
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SelectionChangeEventDispatcher)
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NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(SelectionChangeEventDispatcher)
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MOZ_CAN_RUN_SCRIPT
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void OnSelectionChange(dom::Document* aDocument, dom::Selection* aSelection,
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int16_t aReason);
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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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// These properties are not void*s to avoid the potential situation where
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// the nsINode is freed, and a new nsINode is allocated with the same
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// address, which could potentially break the comparison logic. In reality,
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// this is extremely unlikely to occur (potentially impossible), but these
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// nsCOMPtrs are safer. 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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nsDirection mOldDirection;
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~SelectionChangeEventDispatcher() = default;
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};
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} // namespace mozilla
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#endif // mozilla_SelectionChangeEventDispatcher_h
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