/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIAppWindow;
interface nsIWindowlessBrowser;
interface nsIURI;
interface mozIDOMWindowProxy;
interface nsIAppShell;
interface nsIRemoteTab;

[ptr] native JSContext(JSContext);

%{C++
#include "js/TypeDecls.h"
%}

[scriptable, uuid(19266025-354c-4bb9-986b-3483b2b1cdef)]
interface nsIAppShellService : nsISupports
{
  /**
   * Create a window, which will be initially invisible.
   * @param aParent the parent window.  Can be null.
   * @param aUrl the contents of the new window.
   * @param aChromeMask chrome flags affecting the kind of OS border
   *                    given to the window. see nsIBrowserWindow for
   *                    bit/flag definitions.
   * @param aCallbacks interface providing C++ hooks for window initialization
   *                   before the window is made visible.  Can be null.
   *                   Deprecated.
   * @param aInitialWidth width, in pixels, of the window.  Width of window
   *                      at creation.  Can be overridden by the "width"
   *                      tag in the XUL.  Set to NS_SIZETOCONTENT to force
   *                      the window to wrap to its contents.
   * @param aInitialHeight like aInitialWidth, but subtly different.
   */
  const long SIZE_TO_CONTENT = -1;
  nsIAppWindow createTopLevelWindow(in nsIAppWindow aParent,
                                    in nsIURI aUrl,
                                    in uint32_t aChromeMask,
                                    in long aInitialWidth,
                                    in long aInitialHeight);

  /**
   * This is the constructor for creating an invisible DocShell.
   * It is used to simulate DOM windows without an actual physical
   * representation.
   * @param aIsChrome Set true if you want to use it for chrome content.
   */
  nsIWindowlessBrowser createWindowlessBrowser([optional] in bool aIsChrome);

  [noscript]
  void createHiddenWindow();

  void destroyHiddenWindow();

  /**
   * B2G multi-screen support. When open another top-level window on b2g,
   * a screen ID is needed for identifying which screen this window is
   * opened to.
   * @param aScreenId Differentiate screens of windows. It is platform-
   *                  specific due to the hardware limitation for now.
   */
  [noscript]
  void setScreenId(in uint32_t aScreenId);

  /**
   * Return the (singleton) application hidden window, automatically created
   * and maintained by this AppShellService.
   * @param aResult the hidden window.  Do not unhide hidden window.
   *                Do not taunt hidden window.
   */
  readonly attribute nsIAppWindow hiddenWindow;

  /**
   * Return the (singleton) application hidden window, automatically created
   * and maintained by this AppShellService.
   * @param aResult the hidden window.  Do not unhide hidden window.
   *                Do not taunt hidden window.
   */
  readonly attribute mozIDOMWindowProxy hiddenDOMWindow;

  /**
   * Return true if the application hidden window was provided by the
   * application. If it wasn't, the default hidden window was used. This will
   * usually be false on all non-mac platforms.
   */
  readonly attribute boolean applicationProvidedHiddenWindow;

  /**
   * Add a window to the application's registry of windows.  These windows
   * are generally shown in the Windows taskbar, and the application
   * knows it can't quit until it's out of registered windows.
   * @param aWindow the window to register
   * @note When this method is successful, it fires the global notification
   *       "xul-window-registered"
   */
  void registerTopLevelWindow(in nsIAppWindow aWindow);

  /**
   * Remove a window from the application's window registry. Note that
   * this method won't automatically attempt to quit the app when
   * the last window is unregistered. For that, see Quit().
   * @param aWindow you see the pattern
   */
  void unregisterTopLevelWindow(in nsIAppWindow aWindow);

  /**
   * Whether the hidden window has been lazily created.
   */
  readonly attribute boolean hasHiddenWindow;

  /**
   * Start/stop tracking lags in the event loop.
   * If the event loop gets unresponsive, a "event-loop-lag" notification
   * is sent. Note that calling `startEventLoopLagTracking` when tracking
   * is already enabled has no effect.
   * @return true if tracking succeeded.
   */
  bool startEventLoopLagTracking();
  void stopEventLoopLagTracking();
};