mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-08-16 08:29:02 +00:00
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 -*- */
|
|
/* 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 mozilla_SelectionChangeListener_h_
|
|
#define mozilla_SelectionChangeListener_h_
|
|
|
|
#include "nsISelectionListener.h"
|
|
#include "nsISelectionPrivate.h"
|
|
#include "mozilla/Attributes.h"
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
class SelectionChangeListener final : public nsISelectionListener
|
|
{
|
|
public:
|
|
// SelectionChangeListener has to participate in cycle collection because
|
|
// it holds strong references to nsINodes in its mOldRanges array.
|
|
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
|
|
NS_DECL_CYCLE_COLLECTION_CLASS(SelectionChangeListener)
|
|
NS_DECL_NSISELECTIONLISTENER
|
|
|
|
// This field is used to keep track of the ranges which were present in the
|
|
// selection when the selectionchange event was previously fired. This allows
|
|
// for the selectionchange event to only be fired when a selection is actually
|
|
// changed.
|
|
struct RawRangeData
|
|
{
|
|
// These properties are not void*s to avoid the potential situation where the
|
|
// nsINode is freed, and a new nsINode is allocated with the same address, which
|
|
// could potentially break the comparison logic. In reality, this is extremely
|
|
// unlikely to occur (potentially impossible), but these nsCOMPtrs are safer.
|
|
// They are never dereferenced.
|
|
nsCOMPtr<nsINode> mStartParent;
|
|
nsCOMPtr<nsINode> mEndParent;
|
|
|
|
// XXX These are int32_ts on nsRange, but uint32_ts in the return value
|
|
// of GetStart_, so I use uint32_ts here. See bug 1194256.
|
|
uint32_t mStartOffset;
|
|
uint32_t mEndOffset;
|
|
|
|
explicit RawRangeData(const nsRange* aRange);
|
|
bool Equals(const nsRange* aRange);
|
|
};
|
|
|
|
private:
|
|
nsTArray<RawRangeData> mOldRanges;
|
|
|
|
~SelectionChangeListener() {}
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_SelectionChangeListener_h_
|