gecko-dev/layout/base/nsLayoutHistoryState.cpp

162 строки
3.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
NS_DECL_NSILAYOUTHISTORYSTATE
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)
NS_IMETHODIMP
nsLayoutHistoryState::GetHasStates(bool* aHasStates)
{
*aHasStates = HasStates();
return NS_OK;
}
NS_IMETHODIMP
nsLayoutHistoryState::GetKeys(uint32_t* aCount, char*** aKeys)
{
if (!HasStates()) {
return NS_ERROR_FAILURE;
}
char** keys =
static_cast<char**>(moz_xmalloc(sizeof(char*) * mStates.Count()));
*aCount = mStates.Count();
*aKeys = keys;
for (auto iter = mStates.Iter(); !iter.Done(); iter.Next()) {
*keys = ToNewCString(iter.Key());
keys++;
}
return NS_OK;
}
NS_IMETHODIMP
nsLayoutHistoryState::GetPresState(const nsACString& aKey,
float* aScrollX, float* aScrollY,
bool* aAllowScrollOriginDowngrade,
float* aRes, bool* aScaleToRes)
{
nsPresState* state = GetState(nsCString(aKey));
if (!state) {
return NS_ERROR_FAILURE;
}
*aScrollX = state->GetScrollPosition().x;
*aScrollY = state->GetScrollPosition().y;
*aAllowScrollOriginDowngrade = state->GetAllowScrollOriginDowngrade();
*aRes = state->GetResolution();
*aScaleToRes = state->GetScaleToResolution();
return NS_OK;
}
NS_IMETHODIMP
nsLayoutHistoryState::AddNewPresState(const nsACString& aKey,
float aScrollX, float aScrollY,
bool aAllowScrollOriginDowngrade,
float aRes, bool aScaleToRes)
{
nsPresState* newState = new nsPresState();
newState->SetScrollState(nsPoint(aScrollX, aScrollY));
newState->SetAllowScrollOriginDowngrade(aAllowScrollOriginDowngrade);
newState->SetResolution(aRes);
newState->SetScaleToResolution(aScaleToRes);
mStates.Put(nsCString(aKey), newState);
return NS_OK;
}
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()
{
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));
}
}
}