зеркало из https://github.com/mozilla/gecko-dev.git
97 строки
2.2 KiB
C++
97 строки
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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/*
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* container for information saved in session history when the document
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* is not
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*/
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#include "nsILayoutHistoryState.h"
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#include "nsWeakReference.h"
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#include "nsClassHashtable.h"
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#include "nsPresState.h"
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#include "mozilla/Attributes.h"
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class nsLayoutHistoryState final : public nsILayoutHistoryState,
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public nsSupportsWeakReference
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{
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public:
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nsLayoutHistoryState()
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: mScrollPositionOnly(false)
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{
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}
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NS_DECL_ISUPPORTS
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// nsILayoutHistoryState
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virtual void
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AddState(const nsCString& aKey, nsPresState* aState) override;
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virtual nsPresState*
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GetState(const nsCString& aKey) override;
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virtual void
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RemoveState(const nsCString& aKey) override;
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virtual bool
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HasStates() const override;
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virtual void
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SetScrollPositionOnly(const bool aFlag) override;
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private:
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~nsLayoutHistoryState() {}
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bool mScrollPositionOnly;
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nsClassHashtable<nsCStringHashKey,nsPresState> mStates;
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};
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already_AddRefed<nsILayoutHistoryState>
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NS_NewLayoutHistoryState()
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{
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nsRefPtr<nsLayoutHistoryState> state = new nsLayoutHistoryState();
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return state.forget();
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}
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NS_IMPL_ISUPPORTS(nsLayoutHistoryState,
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nsILayoutHistoryState,
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nsISupportsWeakReference)
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void
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nsLayoutHistoryState::AddState(const nsCString& aStateKey, nsPresState* aState)
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{
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mStates.Put(aStateKey, aState);
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}
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nsPresState*
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nsLayoutHistoryState::GetState(const nsCString& aKey)
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{
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nsPresState* state = nullptr;
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bool entryExists = mStates.Get(aKey, &state);
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if (entryExists && mScrollPositionOnly) {
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// Ensure any state that shouldn't be restored is removed
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state->ClearNonScrollState();
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}
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return state;
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}
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void
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nsLayoutHistoryState::RemoveState(const nsCString& aKey)
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{
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mStates.Remove(aKey);
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}
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bool
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nsLayoutHistoryState::HasStates() const
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{
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return mStates.Count() != 0;
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}
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void
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nsLayoutHistoryState::SetScrollPositionOnly(const bool aFlag)
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{
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mScrollPositionOnly = aFlag;
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}
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