gecko/dom/interfaces/base/nsIFocusManager.idl

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/* -*- 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 Foundation
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "domstubs.idl"
interface nsIDocument;
interface nsIContent;
[scriptable, uuid(64CAE24B-8C2D-4B75-9047-BC9668D85975)]
/**
* The focus manager deals with all focus related behaviour. Only one element
* in the entire application may have the focus at a time; this element
* receives any keyboard events. While there is only one application-wide
* focused element, each nsIDOMWindow maintains a reference to the element
* that would be focused if the window was active.
*
* If the window's reference is to a frame element (iframe, browser,
* editor), then the child window contains the element that is currently
* focused. If the window's reference is to a root element, then the root is
* focused. If a window's reference is null, then no element is focused, yet
* the window is still focused.
*
* The blur event is fired on an element when it loses the application focus.
* After this blur event, if the focus is moving away from a document, two
* additional blur events are fired on the old document and window containing
* the focus respectively.
*
* When a new document is focused, two focus events are fired on the new
* document and window respectively. Then the focus event is fired on an
* element when it gains the application focus.
*
* A special case is that the root element may be focused, yet does not
* receive the element focus and blur events. Instead a focus outline may be
* drawn around the document.
*
* Blur and focus events do not bubble as per the W3C DOM Events spec.
*/
interface nsIFocusManager : nsISupports
{
/**
* The most active (frontmost) window, or null if no window that is part of
* the application is active. Setting the activeWindow raises it, and
* focuses the current child window's current element, if any. Setting this
* to null or to a non-top-level window throws an NS_ERROR_INVALID_ARG
* exception.
*/
attribute nsIDOMWindow activeWindow;
/**
* The child window within the activeWindow that is focused. This will
* always be activeWindow, a child window of activeWindow or null if no
* child window is focused. Setting the focusedWindow changes the focused
* window and raises the toplevel window it is in. If the current focus
* within the new focusedWindow is a frame element, then the focusedWindow
* will actually be set to the child window and the current element within
* that set as the focused element. This process repeats downwards until a
* non-frame element is found.
*/
attribute nsIDOMWindow focusedWindow;
/**
* The element that is currently focused. This will always be an element
* within the document loaded in focusedWindow or null if no element in that
* document is focused.
*/
readonly attribute nsIDOMElement focusedElement;
/**
* Returns the method that was used to focus the element in window. This
* will either be 0, FLAG_BYMOUSE or FLAG_BYKEY. If window is null, then
* the current focusedWindow will be used by default. This has the result
* of retrieving the method that was used to focus the currently focused
* element.
*/
PRUint32 getLastFocusMethod(in nsIDOMWindow window);
/**
* Changes the focused element reference within the window containing
* aElement to aElement.
*/
void setFocus(in nsIDOMElement aElement, in unsigned long aFlags);
/**
* Move the focus to another element. If aStartElement is specified, then
* movement is done relative to aStartElement. If aStartElement is null,
* then movement is done relative to the currently focused element. If no
* element is focused, focus the first focusable element within the
* document (or the last focusable element if aType is MOVEFOCUS_END). This
* method is equivalent to setting the focusedElement to the new element.
*
* Specifying aStartElement and using MOVEFOCUS_LAST is not currently
* implemented.
*
* If no element is found, and aType is either MOVEFOCUS_ROOT or
* MOVEFOCUS_CARET, then the focus is cleared. If aType is any other value,
* the focus is not changed.
*
* Returns the element that was focused.
*/
nsIDOMElement moveFocus(in nsIDOMWindow aWindow, in nsIDOMElement aStartElement,
in unsigned long aType, in unsigned long aFlags);
/**
* Clears the focused element within aWindow. If the current focusedWindow
* is a descendant of aWindow, sets the current focusedWindow to aWindow.
*
* @throws NS_ERROR_INVALID_ARG if aWindow is null
*/
void clearFocus(in nsIDOMWindow aWindow);
/**
* Returns the currently focused element within aWindow. If aWindow is equal
* to the current value of focusedWindow, then the returned element will be
* the application-wide focused element (the value of focusedElement). The
* return value will be null if no element is focused.
*
* If aDeep is true, then child frames are traversed and the return value
* may be the element within a child descendant window that is focused. If
* aDeep if false, then the return value will be the frame element if the
* focus is in a child frame.
*
* aFocusedWindow will be set to the currently focused descendant window of
* aWindow, or to aWindow if aDeep is false. This will be set even if no
* element is focused.
*
* @throws NS_ERROR_INVALID_ARG if aWindow is null
*/
nsIDOMElement getFocusedElementForWindow(in nsIDOMWindow aWindow, in PRBool aDeep,
out nsIDOMWindow aFocusedWindow);
/**
* Moves the selection caret within aWindow to the current focus.
*/
void moveCaretToFocus(in nsIDOMWindow aWindow);
/*
* Raise the window when switching focus
*/
const unsigned long FLAG_RAISE = 1;
/**
* Do not scroll the element to focus into view
*/
const unsigned long FLAG_NOSCROLL = 2;
/**
* If attempting to change focus in a window that is not focused, do not
* switch focus to that window. Instead, just update the focus within that
* window and leave the application focus as is. This flag will have no
* effect if a child window is focused and an attempt is made to adjust the
* focus in an ancestor, as the frame must be switched in this case.
*/
const unsigned long FLAG_NOSWITCHFRAME = 4;
/**
* Focus is changing due to a mouse operation, for instance the mouse was
* clicked on an element.
*/
const unsigned long FLAG_BYMOUSE = 0x1000;
/**
* Focus is changing due to a key operation, for instance pressing the tab
* key. This flag would normally be passed when MOVEFOCUS_FORWARD or
* MOVEFOCUS_BACKWARD is used.
*/
const unsigned long FLAG_BYKEY = 0x2000;
/**
* Focus is changing due to a call to MoveFocus. This flag will be implied
* when MoveFocus is called except when one of the other mechanisms (mouse
* or key) is specified, or when the type is MOVEFOCUS_ROOT or
* MOVEFOCUS_CARET.
*/
const unsigned long FLAG_BYMOVEFOCUS = 0x4000;
// these constants are used with the aType argument to MoveFocus
/** move focus forward one element, used when pressing TAB */
const unsigned long MOVEFOCUS_FORWARD = 1;
/** move focus backward one element, used when pressing Shift+TAB */
const unsigned long MOVEFOCUS_BACKWARD = 2;
/** move focus forward to the next frame document, used when pressing F6 */
const unsigned long MOVEFOCUS_FORWARDDOC = 3;
/** move focus forward to the previous frame document, used when pressing Shift+F6 */
const unsigned long MOVEFOCUS_BACKWARDDOC = 4;
/** move focus to the first focusable element */
const unsigned long MOVEFOCUS_FIRST = 5;
/** move focus to the last focusable element */
const unsigned long MOVEFOCUS_LAST = 6;
/** move focus to the root element in the document */
const unsigned long MOVEFOCUS_ROOT = 7;
/** move focus to a link at the position of the caret. This is a special value used to
* focus links as the caret moves over them in caret browsing mode.
*/
const unsigned long MOVEFOCUS_CARET = 8;
/**
* Called when a window has been raised.
*/
[noscript] void windowRaised(in nsIDOMWindow aWindow);
/**
* Called when a window has been lowered.
*/
[noscript] void windowLowered(in nsIDOMWindow aWindow);
/**
* Called when content has been removed.
*/
[noscript] void contentRemoved(in nsIDocument aDocument,
in nsIContent aElement);
/**
* Called when a new document in a window is shown.
*
* If aNeedsFocus is true, then focus events are expected to be fired on the
* window if this window is in the focused window chain.
*/
[noscript] void windowShown(in nsIDOMWindow aWindow, in PRBool aNeedsFocus);
/**
* Called when a document in a window has been hidden or otherwise can no
* longer accept focus.
*/
[noscript] void windowHidden(in nsIDOMWindow aWindow);
/**
* Fire any events that have been delayed due to synchronized actions.
*/
[noscript] void fireDelayedEvents(in nsIDocument aDocument);
};