chrome/browser/apps/app_service/browser_app_instance_observer.h

// Copyright 2021 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_APPS_APP_SERVICE_BROWSER_APP_INSTANCE_OBSERVER_H_
#define CHROME_BROWSER_APPS_APP_SERVICE_BROWSER_APP_INSTANCE_OBSERVER_H_

namespace apps {

struct BrowserAppInstance;

// Observer interface to listen to |BrowserAppInstanceTracker| events.
class BrowserAppInstanceObserver {
 public:
  virtual ~BrowserAppInstanceObserver() = default;

  // Called when a new app instance is started: a tab or a window is open, a tab
  // navigates to a URL with an app.
  virtual void OnBrowserAppAdded(const BrowserAppInstance& instance);
  // Called when the app's window, app's tab, or a window containing the app's
  // tab changes properties (visibility, active state), or a tab gets moved
  // between browsers.
  virtual void OnBrowserAppUpdated(const BrowserAppInstance& instance);
  // Called when an app instance is stopped: a tab or window is closed, a new
  // windowed app is open, a tab navigates to a URL with an app.
  virtual void OnBrowserAppRemoved(const BrowserAppInstance& instance);
};

}  // namespace apps

#endif  // CHROME_BROWSER_APPS_APP_SERVICE_BROWSER_APP_INSTANCE_OBSERVER_H_