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/* -*- 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/. */
/*
* interface for container for information saved in session history when
* the document is not
*/
#ifndef _nsILayoutHistoryState_h
#define _nsILayoutHistoryState_h
#include "nsISupports.h"
#include "nsStringFwd.h"
class nsPresState;
template<typename> struct already_AddRefed;
#define NS_ILAYOUTHISTORYSTATE_IID \
{ 0xaef27cb3, 0x4df9, 0x4eeb, \
{ 0xb0, 0xb0, 0xac, 0x56, 0xcf, 0x86, 0x1d, 0x04 } }
class nsILayoutHistoryState : public nsISupports {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILAYOUTHISTORYSTATE_IID)
/**
* Set |aState| as the state object for |aKey|.
* This _transfers_ownership_ of |aState| to the LayoutHistoryState.
* It will be freed when RemoveState() is called or when the
* LayoutHistoryState is destroyed.
*/
virtual void AddState(const nsCString& aKey, nsPresState* aState) = 0;
/**
* Look up the state object for |aKey|.
*/
virtual nsPresState* GetState(const nsCString& aKey) = 0;
/**
* Remove the state object for |aKey|.
*/
virtual void RemoveState(const nsCString& aKey) = 0;
/**
* Check whether this history has any states in it
*/
virtual bool HasStates() const = 0;
/**
* Sets whether this history can contain only scroll position history
* or all possible history
*/
virtual void SetScrollPositionOnly(const bool aFlag) = 0;
/**
* Resets nsPresState::GetScrollState of all nsPresState objects to 0,0.
*/
virtual void ResetScrollState() = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsILayoutHistoryState,
NS_ILAYOUTHISTORYSTATE_IID)
already_AddRefed<nsILayoutHistoryState>
NS_NewLayoutHistoryState();
#endif /* _nsILayoutHistoryState_h */
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