зеркало из https://github.com/mozilla/gecko-dev.git
150 строки
4.2 KiB
C++
150 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "mozilla/PresState.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/UniquePtr.h"
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using namespace mozilla;
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class nsLayoutHistoryState final : public nsILayoutHistoryState,
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public nsSupportsWeakReference {
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public:
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nsLayoutHistoryState() : mScrollPositionOnly(false) {}
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NS_DECL_ISUPPORTS
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NS_DECL_NSILAYOUTHISTORYSTATE
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private:
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~nsLayoutHistoryState() {}
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bool mScrollPositionOnly;
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nsDataHashtable<nsCStringHashKey, UniquePtr<PresState>> mStates;
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};
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already_AddRefed<nsILayoutHistoryState> NS_NewLayoutHistoryState() {
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RefPtr<nsLayoutHistoryState> state = new nsLayoutHistoryState();
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return state.forget();
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}
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NS_IMPL_ISUPPORTS(nsLayoutHistoryState, nsILayoutHistoryState,
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nsISupportsWeakReference)
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NS_IMETHODIMP
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nsLayoutHistoryState::GetHasStates(bool* aHasStates) {
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*aHasStates = HasStates();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLayoutHistoryState::GetKeys(nsTArray<nsCString>& aKeys) {
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if (!HasStates()) {
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return NS_ERROR_FAILURE;
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}
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aKeys.SetCapacity(mStates.Count());
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for (auto iter = mStates.Iter(); !iter.Done(); iter.Next()) {
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aKeys.AppendElement(iter.Key());
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLayoutHistoryState::GetPresState(const nsACString& aKey, float* aScrollX,
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float* aScrollY,
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bool* aAllowScrollOriginDowngrade,
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float* aRes) {
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PresState* state = GetState(nsCString(aKey));
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if (!state) {
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return NS_ERROR_FAILURE;
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}
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*aScrollX = state->scrollState().x;
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*aScrollY = state->scrollState().y;
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*aAllowScrollOriginDowngrade = state->allowScrollOriginDowngrade();
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*aRes = state->resolution();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsLayoutHistoryState::AddNewPresState(const nsACString& aKey, float aScrollX,
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float aScrollY,
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bool aAllowScrollOriginDowngrade,
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float aRes) {
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UniquePtr<PresState> newState = NewPresState();
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newState->scrollState() = nsPoint(aScrollX, aScrollY);
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newState->allowScrollOriginDowngrade() = aAllowScrollOriginDowngrade;
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newState->resolution() = aRes;
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mStates.Put(nsCString(aKey), std::move(newState));
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return NS_OK;
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}
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void nsLayoutHistoryState::AddState(const nsCString& aStateKey,
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UniquePtr<PresState> aState) {
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mStates.Put(aStateKey, std::move(aState));
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}
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PresState* nsLayoutHistoryState::GetState(const nsCString& aKey) {
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UniquePtr<PresState>* statePtr = mStates.GetValue(aKey);
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if (!statePtr) {
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return nullptr;
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}
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PresState* state = statePtr->get();
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if (mScrollPositionOnly) {
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// Ensure any state that shouldn't be restored is removed
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state->contentData() = void_t();
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state->disabledSet() = false;
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}
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return state;
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}
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void nsLayoutHistoryState::RemoveState(const nsCString& aKey) {
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mStates.Remove(aKey);
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}
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bool nsLayoutHistoryState::HasStates() { return mStates.Count() != 0; }
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void nsLayoutHistoryState::SetScrollPositionOnly(const bool aFlag) {
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mScrollPositionOnly = aFlag;
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}
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void nsLayoutHistoryState::ResetScrollState() {
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for (auto iter = mStates.Iter(); !iter.Done(); iter.Next()) {
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PresState* state = iter.Data().get();
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if (state) {
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state->scrollState() = nsPoint(0, 0);
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}
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}
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}
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namespace mozilla {
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UniquePtr<PresState> NewPresState() {
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return MakeUnique<PresState>(
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/* contentData */ mozilla::void_t(),
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/* scrollState */ nsPoint(0, 0),
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/* allowScrollOriginDowngrade */ true,
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/* resolution */ 1.0,
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/* disabledSet */ false,
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/* disabled */ false,
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/* droppedDown */ false);
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}
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} // namespace mozilla
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