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// Copyright 2012 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/ui/search/instant_controller.h"
#include <stddef.h>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search/instant_service.h"
#include "chrome/browser/search/instant_service_factory.h"
#include "chrome/browser/search/search.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/common/url_constants.h"
#include "content/public/browser/navigation_details.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
class InstantController::TabObserver : public content::WebContentsObserver {
public:
TabObserver(content::WebContents* web_contents,
base::RepeatingClosure callback)
: content::WebContentsObserver(web_contents),
callback_(std::move(callback)) {}
TabObserver(const TabObserver&) = delete;
TabObserver& operator=(const TabObserver&) = delete;
~TabObserver() override = default;
private:
// Overridden from content::WebContentsObserver:
void NavigationEntryCommitted(
const content::LoadCommittedDetails& load_details) override {
if (load_details.is_main_frame && search::IsInstantNTP(web_contents())) {
callback_.Run();
}
}
base::RepeatingClosure callback_;
};
InstantController::InstantController(Profile* profile,
TabStripModel* tab_strip_model)
: profile_(profile) {
tab_strip_model->AddObserver(this);
}
InstantController::~InstantController() = default;
void InstantController::OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) {
if (tab_strip_model->empty() || !selection.active_tab_changed()) {
return;
}
if (selection.old_contents) {
StopWatchingTab(selection.old_contents);
}
if (selection.new_contents) {
StartWatchingTab(selection.new_contents);
}
}
void InstantController::StartWatchingTab(content::WebContents* web_contents) {
if (!tab_observer_ || tab_observer_->web_contents() != web_contents) {
tab_observer_ = std::make_unique<TabObserver>(
web_contents,
base::BindRepeating(&InstantController::UpdateInfoForInstantTab,
base::Unretained(this)));
// If this tab is an NTP, immediately send it the required info.
if (search::IsInstantNTP(web_contents)) {
UpdateInfoForInstantTab();
}
}
}
void InstantController::StopWatchingTab(content::WebContents* web_contents) {
if (tab_observer_ && tab_observer_->web_contents() == web_contents) {
tab_observer_ = nullptr;
}
}
void InstantController::UpdateInfoForInstantTab() {
InstantService* instant_service =
InstantServiceFactory::GetForProfile(profile_);
if (instant_service) {
instant_service->UpdateNtpTheme();
instant_service->UpdateMostVisitedInfo();
}
}
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