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// Copyright 2019 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/tab_contents/form_interaction_tab_helper.h"
#include "base/functional/bind.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/page_node.h"
#include "components/performance_manager/public/performance_manager.h"
namespace {
#if DCHECK_IS_ON()
bool g_observer_exists = false;
#endif
} // namespace
// Graph observer used to receive the page form interaction events.
class FormInteractionTabHelper::GraphObserver
: public performance_manager::PageNodeObserver,
public performance_manager::GraphOwned {
public:
GraphObserver() = default;
~GraphObserver() override = default;
GraphObserver(const GraphObserver& other) = delete;
GraphObserver& operator=(const GraphObserver&) = delete;
private:
// performance_manager::PageNodeObserver:
void OnHadFormInteractionChanged(
const performance_manager::PageNode* page_node) override;
// performance_manager::GraphOwned:
void OnPassedToGraph(performance_manager::Graph* graph) override;
void OnTakenFromGraph(performance_manager::Graph* graph) override;
};
void FormInteractionTabHelper::GraphObserver::OnHadFormInteractionChanged(
const performance_manager::PageNode* page_node) {
base::WeakPtr<content::WebContents> contents = page_node->GetWebContents();
CHECK(contents);
bool had_form_interaction = page_node->HadFormInteraction();
// Notifications can be emitted by extensions, ignore these.
if (auto* tab_helper =
FormInteractionTabHelper::FromWebContents(contents.get())) {
// Sanity check against spurious changes.
DCHECK_NE(tab_helper->had_form_interaction_, had_form_interaction);
tab_helper->had_form_interaction_ = had_form_interaction;
}
}
void FormInteractionTabHelper::GraphObserver::OnPassedToGraph(
performance_manager::Graph* graph) {
#if DCHECK_IS_ON()
DCHECK(!g_observer_exists);
g_observer_exists = true;
#endif
graph->AddPageNodeObserver(this);
}
void FormInteractionTabHelper::GraphObserver::OnTakenFromGraph(
performance_manager::Graph* graph) {
#if DCHECK_IS_ON()
DCHECK(g_observer_exists);
g_observer_exists = false;
#endif
graph->RemovePageNodeObserver(this);
}
// static
std::unique_ptr<performance_manager::GraphOwned>
FormInteractionTabHelper::CreateGraphObserver() {
return std::make_unique<FormInteractionTabHelper::GraphObserver>();
}
FormInteractionTabHelper::FormInteractionTabHelper(
content::WebContents* contents)
: content::WebContentsUserData<FormInteractionTabHelper>(*contents) {}
FormInteractionTabHelper::~FormInteractionTabHelper() = default;
bool FormInteractionTabHelper::had_form_interaction() const {
#if DCHECK_IS_ON()
// The observer is allowed to not exist in tests that don't use
// PerformanceManager, in which case this function will always return false.
DCHECK(g_observer_exists ||
!performance_manager::PerformanceManager::IsAvailable());
#endif
return had_form_interaction_;
}
WEB_CONTENTS_USER_DATA_KEY_IMPL(FormInteractionTabHelper);
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