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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chained_back_navigation_tracker.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/navigation_handle.h"
#include "third_party/blink/public/mojom/navigation/navigation_params.mojom-shared.h"
#include "ui/base/page_transition_types.h"
ChainedBackNavigationTracker::ChainedBackNavigationTracker(
content::WebContents* contents)
: content::WebContentsObserver(contents),
content::WebContentsUserData<ChainedBackNavigationTracker>(*contents) {}
ChainedBackNavigationTracker::~ChainedBackNavigationTracker() = default;
void ChainedBackNavigationTracker::DidStartNavigation(
content::NavigationHandle* navigation) {
if (navigation->GetNavigationEntry() &&
(navigation->GetNavigationEntry()->GetTransitionType() &
ui::PageTransition::PAGE_TRANSITION_FORWARD_BACK) &&
!navigation->IsRendererInitiated()) {
IncrementChainedBackNavigationCount();
} else {
ResetChainedBackNavigationCount();
}
}
void ChainedBackNavigationTracker::IncrementChainedBackNavigationCount() {
if (chained_back_navigation_count_ == 0 ||
(base::TimeTicks::Now() - last_back_navigation_time_).InMilliseconds() <=
kMaxChainedBackNavigationIntervalInMilliseconds) {
chained_back_navigation_count_++;
} else {
chained_back_navigation_count_ = 1u;
}
last_back_navigation_time_ = base::TimeTicks::Now();
}
void ChainedBackNavigationTracker::ResetChainedBackNavigationCount() {
chained_back_navigation_count_ = 0;
last_back_navigation_time_ = base::TimeTicks();
}
void ChainedBackNavigationTracker::
RecordBackButtonClickForChainedBackNavigation() {
if (chained_back_button_click_count_ == 0 ||
(base::TimeTicks::Now() - last_back_button_click_time_)
.InMilliseconds() <=
kMaxChainedBackNavigationIntervalInMilliseconds) {
chained_back_button_click_count_++;
} else {
chained_back_button_click_count_ = 1u;
}
last_back_button_click_time_ = base::TimeTicks::Now();
}
bool ChainedBackNavigationTracker::IsChainedBackNavigationRecentlyPerformed()
const {
return (base::TimeTicks::Now() - last_back_navigation_time_)
.InMilliseconds() <=
kMaxChainedBackNavigationIntervalInMilliseconds &&
chained_back_navigation_count_ >= kMinimumChainedBackNavigationLength;
}
bool ChainedBackNavigationTracker::
IsBackButtonChainedBackNavigationRecentlyPerformed() const {
return IsChainedBackNavigationRecentlyPerformed() &&
(base::TimeTicks::Now() - last_back_button_click_time_)
.InMilliseconds() <=
kMaxChainedBackNavigationIntervalInMilliseconds &&
chained_back_button_click_count_ >=
kMinimumChainedBackNavigationLength;
}
WEB_CONTENTS_USER_DATA_KEY_IMPL(ChainedBackNavigationTracker);
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