File: tablet_mode_page_behavior.h

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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_CHROMEOS_TABLET_MODE_TABLET_MODE_PAGE_BEHAVIOR_H_
#define CHROME_BROWSER_CHROMEOS_TABLET_MODE_TABLET_MODE_PAGE_BEHAVIOR_H_

#include <memory>

#include "chrome/browser/ui/browser_tab_strip_tracker_delegate.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "ui/display/display_observer.h"

class BrowserTabStripTracker;

// Updates WebContents Blink preferences on tablet mode state change.
class TabletModePageBehavior : public display::DisplayObserver,
                               public BrowserTabStripTrackerDelegate,
                               public TabStripModelObserver {
 public:
  TabletModePageBehavior();

  TabletModePageBehavior(const TabletModePageBehavior&) = delete;
  TabletModePageBehavior& operator=(const TabletModePageBehavior&) = delete;

  ~TabletModePageBehavior() override;

  // Notify the tablet mode change.
  void OnTabletModeToggled(bool enabled);

  // display::DisplayObserver:
  void OnDisplayTabletStateChanged(display::TabletState state) override;

  // BrowserTabStripTrackerDelegate:
  bool ShouldTrackBrowser(Browser* browser) override;

  // TabStripModelObserver:
  void OnTabStripModelChanged(
      TabStripModel* tab_strip_model,
      const TabStripModelChange& change,
      const TabStripSelectionChange& selection) override;

 private:
  // Enables/disables mobile-like behavior for webpages in existing browsers, as
  // well as starts observing new browser pages if |enabled| is true.
  void SetMobileLikeBehaviorEnabled(bool enabled);

  // 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
  // `ChromeContentBrowserClientAshPart::OverrideWebPreferences()` 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_;
};

#endif  // CHROME_BROWSER_CHROMEOS_TABLET_MODE_TABLET_MODE_PAGE_BEHAVIOR_H_