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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/. */
/*
* container for information saved in session history when the document
* is not
*/
#include "nsILayoutHistoryState.h"
#include "nsWeakReference.h"
#include "nsClassHashtable.h"
#include "nsPresState.h"
#include "mozilla/Attributes.h"
class nsLayoutHistoryState final : public nsILayoutHistoryState,
public nsSupportsWeakReference
{
public:
nsLayoutHistoryState()
: mScrollPositionOnly(false)
{
}
NS_DECL_ISUPPORTS
// nsILayoutHistoryState
virtual void
AddState(const nsCString& aKey, nsPresState* aState) override;
virtual nsPresState*
GetState(const nsCString& aKey) override;
virtual void
RemoveState(const nsCString& aKey) override;
virtual bool
HasStates() const override;
virtual void
SetScrollPositionOnly(const bool aFlag) override;
virtual void
ResetScrollState() override;
private:
~nsLayoutHistoryState() {}
bool mScrollPositionOnly;
nsClassHashtable<nsCStringHashKey,nsPresState> mStates;
};
already_AddRefed<nsILayoutHistoryState>
NS_NewLayoutHistoryState()
{
RefPtr<nsLayoutHistoryState> state = new nsLayoutHistoryState();
return state.forget();
}
NS_IMPL_ISUPPORTS(nsLayoutHistoryState,
nsILayoutHistoryState,
nsISupportsWeakReference)
void
nsLayoutHistoryState::AddState(const nsCString& aStateKey, nsPresState* aState)
{
mStates.Put(aStateKey, aState);
}
nsPresState*
nsLayoutHistoryState::GetState(const nsCString& aKey)
{
nsPresState* state = nullptr;
bool entryExists = mStates.Get(aKey, &state);
if (entryExists && mScrollPositionOnly) {
// Ensure any state that shouldn't be restored is removed
state->ClearNonScrollState();
}
return state;
}
void
nsLayoutHistoryState::RemoveState(const nsCString& aKey)
{
mStates.Remove(aKey);
}
bool
nsLayoutHistoryState::HasStates() const
{
return mStates.Count() != 0;
}
void
nsLayoutHistoryState::SetScrollPositionOnly(const bool aFlag)
{
mScrollPositionOnly = aFlag;
}
void
nsLayoutHistoryState::ResetScrollState()
{
for (auto iter = mStates.Iter(); !iter.Done(); iter.Next()) {
nsPresState* state = iter.UserData();
if (state) {
state->SetScrollState(nsPoint(0, 0));
}
}
}
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