/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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"
#include "nsISimpleEnumerator.idl"

%{C++
#define NS_WINDOWMEDIATOR_CID \
{ 0x79a2b7cc, 0xf05b, 0x4605, \
  { 0xbf, 0xa0, 0xfa, 0xc5, 0x4f, 0x27, 0xee, 0xc8 } }

#define NS_WINDOWMEDIATOR_CONTRACTID \
  "@mozilla.org/appshell/window-mediator;1"

enum class WindowMediatorFilter : uint8_t {
  None = 0,
  SkipPrivateBrowsing = 1 << 0,
  SkipClosed = 1 << 1,
  SkipNonPrivateBrowsing = 1 << 2,
};

MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(WindowMediatorFilter)
%}

interface mozIDOMWindow;
interface mozIDOMWindowProxy;
interface nsIAppWindow;
interface nsIWidget;
interface nsIWindowMediatorListener;

[scriptable, uuid(df0da056-357d-427f-bafd-e6cbf19c9381)]
interface nsIWindowMediator: nsISupports
{
  /** Return an enumerator which iterates over all windows of type aWindowType
    * from the oldest window to the youngest.
    * @param  aWindowType the returned enumerator will enumerate only
    *                     windows of this type. ("type" is the
    *                     |windowtype| attribute of the XML <window> element.)
    *                     If null, all windows will be enumerated.
    * @return an enumerator of nsIDOMWindows.  Note that windows close
    *         asynchronously in many cases, so windows returned from this
    *         enumerator can have .closed set to true.  Caveat enumerator!
    */
  nsISimpleEnumerator getEnumerator(in wstring aWindowType);

  /** Identical to getEnumerator except:
    * @return an enumerator of nsIAppWindows
  */
  nsISimpleEnumerator getAppWindowEnumerator(in wstring aWindowType);

  /** Return an enumerator which iterates over all windows of type aWindowType
    * in their z (front-to-back) order. Note this interface makes
    * no requirement that a window couldn't be revisited if windows
    * are re-ordered while z-order enumerators are active.
    * @param  aWindowType the returned enumerator will enumerate only
    *                     windows of this type. ("type" is the
    *                     |windowtype| attribute of the XML <window> element.)
    *                     If null, all windows will be enumerated.
    * @param  aFrontToBack if true, the enumerator enumerates windows in order
    *                      from front to back. back to front if false.
    * @return an enumerator of nsIAppWindows
    */
  nsISimpleEnumerator getZOrderAppWindowEnumerator(in wstring aWindowType,
                        in boolean aFrontToBack);

  /** This is a shortcut for simply fetching the first window in
    * front to back order.
    * @param  aWindowType return the topmost window of this type.
    *                     ("type" is the |windowtype| attribute of
    *                     the XML <window> element.)
    *                     If null, return the topmost window of any type.
    * @return the topmost window
    */
  mozIDOMWindowProxy getMostRecentWindow(in wstring aWindowType);

  /** This is a shortcut for getMostRecentWindow('navigator:browser'), but
    * if that fails it also tries 'navigator:geckoview' and 'mail:3pane'.
    *
    * @return the topmost browser window
    */
  mozIDOMWindowProxy getMostRecentBrowserWindow();

  /**
   * Same as getMostRecentWindow, but ignores private browsing
   * windows.
   */
  mozIDOMWindowProxy getMostRecentNonPBWindow(in wstring aWindowType);

  /**
   * Same as getMostRecentWindow, but filters out based on the parameter.
   * @param aFilter The value based on the enum WindowMediatorFilter.
   *
   * (Not using WindowMediatorFilter directly it requires [builtinclass])
   */
  mozIDOMWindowProxy getMostRecentWindowBy(in wstring aWindowType, in uint8_t aFilter);

  /**
   * Return the outer window with the given ID, if any.  Can return null.
   */
  mozIDOMWindowProxy getOuterWindowWithId(in unsigned long long aOuterWindowID);

  /**
    * Return the inner window with the given current window ID, if any.
    * Can return null if no inner window with the ID exists or if it's not
    * a current inner anymore.
    */
  mozIDOMWindow getCurrentInnerWindowWithId(in unsigned long long aInnerWindowID);

  /** Add the window to the list of known windows. Listeners (see
    * addListener) will be notified through their onOpenWindow method.
    * @param aWindow the window to add
    */
  [noscript] void registerWindow(in nsIAppWindow aWindow);

  /** Remove the window from the list of known windows. Listeners (see
    * addListener) will be be notified through their onCloseWindow method.
    * @param aWindow the window to remove
    */
  [noscript] void unregisterWindow(in nsIAppWindow aWindow);

  /** Call this method when a window gains focus. It's a primitive means of
    * determining the most recent window. It's no longer necessary and it
    * really should be removed.
    * @param aWindow the window which has gained focus
    */
  [noscript] void updateWindowTimeStamp(in nsIAppWindow aWindow);

  /** Register a listener for window status changes.
    * keeps strong ref? (to be decided)
    * @param aListener the listener to register
    */
  void addListener(in nsIWindowMediatorListener aListener);

  /** Unregister a listener of window status changes.
    * @param aListener the listener to unregister
    */
  void removeListener(in nsIWindowMediatorListener aListener);
};