gecko-dev/layout/base/nsStyleChangeList.h
2017-03-07 14:00:19 -08:00

69 lines
1.9 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/. */
/*
* a list of the recomputation that needs to be done in response to a
* style change
*/
#ifndef nsStyleChangeList_h___
#define nsStyleChangeList_h___
#include "mozilla/Attributes.h"
#include "mozilla/StyleBackendType.h"
#include "nsChangeHint.h"
#include "nsCOMPtr.h"
class nsIFrame;
class nsIContent;
struct nsStyleChangeData
{
nsIFrame* mFrame; // weak
nsCOMPtr<nsIContent> mContent;
nsChangeHint mHint;
};
class nsStyleChangeList : private AutoTArray<nsStyleChangeData, 10>
{
typedef AutoTArray<nsStyleChangeData, 10> base_type;
nsStyleChangeList(const nsStyleChangeList&) = delete;
public:
using base_type::begin;
using base_type::end;
using base_type::IsEmpty;
using base_type::Clear;
using base_type::Length;
using base_type::operator[];
explicit nsStyleChangeList(mozilla::StyleBackendType aType) :
mType(aType) { MOZ_COUNT_CTOR(nsStyleChangeList); }
~nsStyleChangeList() { MOZ_COUNT_DTOR(nsStyleChangeList); }
void AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint);
// Starting from the end of the list, removes all changes until the list is
// empty or an element with |mContent != aContent| is found.
void PopChangesForContent(nsIContent* aContent)
{
while (Length() > 0) {
if (LastElement().mContent == aContent) {
RemoveElementAt(Length() - 1);
} else {
break;
}
}
}
bool IsGecko() const { return mType == mozilla::StyleBackendType::Gecko; }
bool IsServo() const { return mType == mozilla::StyleBackendType::Servo; }
private:
mozilla::StyleBackendType mType;
};
#endif /* nsStyleChangeList_h___ */