/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla.org
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

/**
 * nsIDOMWindowUtils is intended for infrequently-used methods related
 * to the current nsIDOMWindow.  Some of the methods may require
 * elevated privileges; the method implementations should contain the
 * necessary security checks.  Access this interface by calling
 * getInterface on a DOMWindow.
 */

interface nsIDOMElement;
interface nsIDOMHTMLCanvasElement;

[scriptable, uuid(a2d8d4f8-6082-4653-b91d-f958518b6ada)]
interface nsIDOMWindowUtils : nsISupports {

  /**
   * Image animation mode of the window. When this attribute's value
   * is changed, the implementation should set all images in the window
   * to the given value. That is, when set to kDontAnimMode, all images
   * will stop animating. The attribute's value must be one of the
   * animationMode values from imgIContainer.
   * @note Images may individually override the window's setting after
   *       the window's mode is set. Therefore images given different modes
   *       since the last setting of the window's mode may behave
   *       out of line with the window's overall mode.
   * @note The attribute's value is the window's overall mode. It may
   *       for example continue to report kDontAnimMode after all images
   *       have subsequently been individually animated.
   * @note Only images immediately in this window are affected;
   *       this is not recursive to subwindows.
   * @see imgIContainer
   */
  attribute unsigned short imageAnimationMode;

  /**
   * Whether the charset of the window's current document has been forced by
   * the user.
   * Cannot be accessed from unprivileged context (not content-accessible)
   */
  readonly attribute boolean docCharsetIsForced;

  /**
   * Function to get metadata associated with the window's current document
   * @param aName the name of the metadata.  This should be all lowercase.
   * @return the value of the metadata, or the empty string if it's not set
   *
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   */
  AString getDocumentMetadata(in AString aName);

  /**
   * Force an immediate redraw of this window.  The parameter specifies
   * the number of times to redraw, and the return value is the length,
   * in milliseconds, that the redraws took.  If aCount is not specified
   * or is 0, it is taken to be 1.
   */
  unsigned long redraw([optional] in unsigned long aCount);

  /** Synthesize a mouse event for a window. The event types supported
   *  are: 
   *    mousedown, mouseup, mousemove, mouseover, mouseout, contextmenu
   *
   * Events are sent in coordinates offset by aX and aY from the window.
   *
   * Note that additional events may be fired as a result of this call. For
   * instance, typically a click event will be fired as a result of a
   * mousedown and mouseup in sequence.
   *
   * Normally at this level of events, the mouseover and mouseout events are
   * only fired when the window is entered or exited. For inter-element
   * mouseover and mouseout events, a movemove event fired on the new element
   * should be sufficient to generate the correct over and out events as well.
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   *
   * @param aType event type
   * @param aX x offset in CSS pixels
   * @param aY y offset in CSS pixels
   * @param aButton button to synthesize
   * @param aClickCount number of clicks that have been performed
   * @param aModifiers modifiers pressed, using constants defined in nsIDOMNSEvent
   * @param aIgnoreRootScrollFrame whether the event should ignore viewport bounds
   *                           during dispatch
   */
  void sendMouseEvent(in AString aType,
                      in float aX,
                      in float aY,
                      in long aButton,
                      in long aClickCount,
                      in long aModifiers,
                      [optional] in boolean aIgnoreRootScrollFrame);

  /** Synthesize a mouse scroll event for a window. The event types supported
   *  are: 
   *    DOMMouseScroll
   *    MozMousePixelScroll
   *
   * Events are sent in coordinates offset by aX and aY from the window.
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   *
   * @param aType event type
   * @param aX x offset in CSS pixels
   * @param aY y offset in CSS pixels
   * @param aButton button to synthesize
   * @param aScrollFlags flag bits --- see nsMouseScrollFlags in nsGUIEvent.h
   * @param aDelta the direction and amount to scroll (in lines or pixels,
   * depending on the event type)
   * @param aModifiers modifiers pressed, using constants defined in nsIDOMNSEvent
   */
  void sendMouseScrollEvent(in AString aType,
                            in float aX,
                            in float aY,
                            in long aButton,
                            in long aScrollFlags,
                            in long aDelta,
                            in long aModifiers);

  /**
   * Synthesize a key event to the window. The event types supported are:
   *   keydown, keyup, keypress
   *
   * Key events generally end up being sent to the focused node.
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   *
   * @param aType event type
   * @param aKeyCode key code
   * @param aCharCode character code
   * @param aModifiers modifiers pressed, using constants defined in nsIDOMNSEvent
   * @param aPreventDefault if true, preventDefault() the event before dispatch
   *
   * @return false if the event had preventDefault() called on it,
   *               true otherwise.  In other words, true if and only if the
   *               default action was taken.
   */
  boolean sendKeyEvent(in AString aType,
                       in long aKeyCode,
                       in long aCharCode,
                       in long aModifiers,
                       [optional] in boolean aPreventDefault);

  /**
   * See nsIWidget::SynthesizeNativeKeyEvent
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   */
  void sendNativeKeyEvent(in long aNativeKeyboardLayout,
                          in long aNativeKeyCode,
                          in long aModifierFlags,
                          in AString aCharacters,
                          in AString aUnmodifiedCharacters);

  /**
   * See nsIWidget::ActivateNativeMenuItemAt
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   */
  void activateNativeMenuItemAt(in AString indexString);

  /**
   * See nsIWidget::ForceUpdateNativeMenuAt
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   */
  void forceUpdateNativeMenuAt(in AString indexString);

  /**
   * Focus the element aElement. The element should be in the same document
   * that the window is displaying. Pass null to blur the element, if any,
   * that currently has focus, and focus the document.
   *
   * Cannot be accessed from unprivileged context (not content-accessible)
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges.
   *
   * @param aElement the element to focus
   */
  void focus(in nsIDOMElement aElement);

  /**
   * Force a garbage collection. This will run the cycle-collector twice to
   * make sure all garbage is collected.
   *
   * Will throw a DOM security error if called without UniversalXPConnect
   * privileges in non-debug builds. Available to all callers in debug builds.
   */
  void garbageCollect();

  /**
   * Force processing of any queued paints
   */

  void processUpdates();

  /** Synthesize a simple gesture event for a window. The event types
   *  supported are: MozSwipeGesture, MozMagnifyGestureStart,
   *  MozMagnifyGestureUpdate, MozMagnifyGesture, MozRotateGestureStart,
   *  MozRotateGestureUpdate, MozRotateGesture, MozPressTapGesture, and
   *  MozTapGesture.
   *
   * Cannot be accessed from unprivileged context (not
   * content-accessible) Will throw a DOM security error if called
   * without UniversalXPConnect privileges.
   *
   * @param aType event type
   * @param aX x offset in CSS pixels
   * @param aY y offset in CSS pixels
   * @param aDirection direction, using constants defined in nsIDOMSimpleGestureEvent
   * @param aDelta  amount of magnification or rotation for magnify and rotation events
   * @param aModifiers modifiers pressed, using constants defined in nsIDOMNSEvent
   */
  void sendSimpleGestureEvent(in AString aType,
                              in float aX,
                              in float aY,
                              in unsigned long aDirection,
                              in double aDelta,
                              in long aModifiers);

  /**
   * Retrieve the element at point aX, aY in the window's document.
   *
   * @param aIgnoreRootScrollFrame whether or not to ignore the root scroll
   *        frame when retrieving the element. If false, this method returns
   *        null for coordinates outside of the viewport.
   * @param aFlushLayout flushes layout if true. Otherwise, no flush occurs.
   */
  nsIDOMElement elementFromPoint(in long aX,
                                 in long aY,
                                 in boolean aIgnoreRootScrollFrame,
                                 in boolean aFlushLayout);

  /**
   * Compare the two canvases, returning the number of differing pixels and
   * the maximum difference in a channel.  This will throw an error if
   * the dimensions of the two canvases are different.
   *
   * This method requires UniversalXPConnect privileges.
   */
  PRUint32 compareCanvases(in nsIDOMHTMLCanvasElement aCanvas1,
                           in nsIDOMHTMLCanvasElement aCanvas2,
                           out unsigned long aMaxDifference);

  void clearMozAfterPaintEvents();

  /**
   * Suppresses/unsuppresses user initiated event handling in window's document
   * and subdocuments.
   *
   * @throw NS_ERROR_DOM_SECURITY_ERR if called without UniversalXPConnect
   *        privileges and NS_ERROR_FAILURE if window doesn't have a document.
   */
  void suppressEventHandling(in boolean aSuppress);

  /**
   * Returns the scroll position of the window's currently loaded document.
   *
   * @param aFlushLayout flushes layout if true. Otherwise, no flush occurs.
   * @see nsIDOMWindow::scrollX/Y
   */
  void getScrollXY(in boolean aFlushLayout, out long aScrollX, out long aScrollY);
};
