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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string16.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/cancelable_task_tracker.h"
#include "components/favicon_base/favicon_callback.h"
#include "components/favicon_base/favicon_types.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
#include "url/gurl.h"
// TabUIHelper is used by UI code to obtain the title and favicon for a
// WebContents. The values returned by TabUIHelper differ from the WebContents
// when the WebContents hasn't loaded.
class TabUIHelper : public content::WebContentsObserver,
public content::WebContentsUserData<TabUIHelper> {
~TabUIHelper() override;
// Get the title of the tab. When the associated WebContents' title is empty,
// a customized title is used.
base::string16 GetTitle() const;
// Get the favicon of the tab. It will return a favicon from history service
// if it needs to, otherwise, it will return the favicon of the WebContents.
gfx::Image GetFavicon() const;
// Return true if the throbber should be hidden during a page load.
bool ShouldHideThrobber() const;
// Notifies TabUIHelper that the WebContents' initial navigation is delayed.
// This is called by TabManager when it decides to delay a new tab's
// navigation. TabUIHelper will obtain appropriate title and favicon after
// receiving this signal.
void NotifyInitialNavigationDelayed(bool is_navigation_delayed);
// content::WebContentsObserver implementation
void DidStopLoading() override;
void set_was_active_at_least_once() { was_active_at_least_once_ = true; }
void set_created_by_session_restore(bool created_by_session_restore) {
created_by_session_restore_ = created_by_session_restore;
friend class content::WebContentsUserData<TabUIHelper>;
struct TabUIData {
explicit TabUIData(const GURL& url);
base::string16 title;
gfx::Image favicon;
explicit TabUIHelper(content::WebContents* contents);
// Returns true if a favicon from history should be used. It is used when a
// new tab is opened in the background and its initial navigation is delayed.
bool ShouldUseFaviconFromHistory() const;
void FetchFaviconFromHistory(
const GURL& url,
const favicon_base::FaviconImageCallback& callback);
void OnURLFaviconFetched(const favicon_base::FaviconImageResult& favicon);
void OnHostFaviconFetched(const favicon_base::FaviconImageResult& favicon);
void UpdateFavicon(const favicon_base::FaviconImageResult& favicon);
bool was_active_at_least_once_ = false;
bool is_navigation_delayed_ = false;
bool created_by_session_restore_ = false;
// The data that stores favicon and title. It is non-null only during initial
// navigation when the tab is opened in background.
std::unique_ptr<TabUIData> tab_ui_data_;
base::CancelableTaskTracker favicon_tracker_;
base::WeakPtrFactory<TabUIHelper> weak_ptr_factory_;