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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.
#ifndef CHROME_BROWSER_UI_ASH_TABLET_MODE_CLIENT_H_
#define CHROME_BROWSER_UI_ASH_TABLET_MODE_CLIENT_H_
#include <memory>
#include "ash/public/interfaces/tablet_mode.mojom.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "chrome/browser/ui/browser_tab_strip_tracker_delegate.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "mojo/public/cpp/bindings/binding.h"
class BrowserTabStripTracker;
class TabletModeClientObserver;
// Holds tablet mode state in chrome. Observes ash for changes, then
// synchronously fires all its observers. This allows all tablet mode code in
// chrome to see a state change at the same time.
class TabletModeClient : public ash::mojom::TabletModeClient,
public BrowserTabStripTrackerDelegate,
public TabStripModelObserver {
public:
TabletModeClient();
~TabletModeClient() override;
// Initializes and connects to ash.
void Init();
// Tests can provide a mock mojo interface for the ash controller.
void InitForTesting(ash::mojom::TabletModeControllerPtr controller);
static TabletModeClient* Get();
bool tablet_mode_enabled() const { return tablet_mode_enabled_; }
// Adds the observer and immediately triggers it with the initial state.
void AddObserver(TabletModeClientObserver* observer);
void RemoveObserver(TabletModeClientObserver* observer);
// ash::mojom::TabletModeClient:
void OnTabletModeToggled(bool enabled) override;
// BrowserTabStripTrackerDelegate:
bool ShouldTrackBrowser(Browser* browser) override;
// TabStripModelObserver:
void OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) override;
// Flushes the mojo pipe to ash.
void FlushForTesting();
private:
// Binds this object to its mojo interface and sets it as the ash client.
void BindAndSetClient();
// Enables/disables mobile-like bahvior for webpages in existing browsers, as
// well as starts observing new browser pages if |enabled| is true.
void SetMobileLikeBehaviorEnabled(bool enabled);
bool tablet_mode_enabled_ = false;
// We only override the WebKit preferences of webcontents that belong to
// tabstrips in browsers. When a webcontents is newly created, its WebKit
// preferences are refreshed *before* it's added to any tabstrip, hence
// ChromeContentBrowserClientChromeOsPart::OverrideWebkitPrefs() wouldn't be
// able to override the mobile-like behavior prefs we want. Therefore, we need
// to observe webcontents being added to the tabstrips in order to trigger
// a refresh of its WebKit prefs.
std::unique_ptr<BrowserTabStripTracker> tab_strip_tracker_;
// Binds to the client interface in ash.
mojo::Binding<ash::mojom::TabletModeClient> binding_;
// Keeps the interface pipe alive to receive mojo return values.
ash::mojom::TabletModeControllerPtr tablet_mode_controller_;
base::ObserverList<TabletModeClientObserver,
true /* check_empty */>::Unchecked observers_;
DISALLOW_COPY_AND_ASSIGN(TabletModeClient);
};
#endif // CHROME_BROWSER_UI_ASH_TABLET_MODE_CLIENT_H_