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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_
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