tor-browser

nsIFocusManager.idl (11677B)

---

/* -*- Mode: IDL; 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 "domstubs.idl"

interface mozIDOMWindowProxy;

webidl BrowsingContext;
webidl Document;
webidl Element;

native CallerType(mozilla::dom::CallerType);

/**
* 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.
*/
[scriptable, uuid(86e1f1e1-365d-493b-b52a-a649f3f311dc)]
interface nsIFocusManager : nsISupports
{
 /**
  * The most active (frontmost) window, or null if no window that is part of
  * the application is active. Do not use outside the parent process.
  */
 readonly attribute mozIDOMWindowProxy activeWindow;

 /**
  * In the parent process: The BrowsingContext corresponding to activeWindow.
  * In content processes: The top-level Web content browsing context that
  * focus is in if the application is active and focus is in Web content.
  */
 readonly attribute BrowsingContext activeBrowsingContext;

 /**
  * Parent-process only: The chrome process notion of content's active
  * browsing context.
  */
 readonly attribute BrowsingContext activeContentBrowsingContext;

 /**
  * 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.
  * The setter for this attribute defaults to CallerType::System.
  * If focus is in another process, this is null in content processes and
  * the closest ancestor in the parent process.
  */
 [setter_can_run_script]
 attribute mozIDOMWindowProxy focusedWindow;

 /**
  * Parent-process only: The content BrowsingContext that currently has focus,
  * if any. Note this can be different from activeBrowsingContext in the case
  * of subframes.
  */
 readonly attribute BrowsingContext focusedContentBrowsingContext;

 /**
  * 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 Element 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.
  */
 uint32_t getLastFocusMethod(in mozIDOMWindowProxy window);

 /**
  * Changes the focused element reference within the window containing
  * aElement to aElement or potentially redirects it to an anonymous
  * descendant of it (e.g., for `<input type="number">` the focus is redirected
  * to its descendant `<input type="text">`).
  */
 [can_run_script]
 void setFocus(in Element 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 (see setFocus). The return value
  * may be null if focus was moved into a child process.
  */
 Element moveFocus(in mozIDOMWindowProxy aWindow,
                   in Element 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
  */
 [can_run_script]
 void clearFocus(in mozIDOMWindowProxy 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
  */
 Element getFocusedElementForWindow(in mozIDOMWindowProxy aWindow,
                                    in boolean aDeep,
                                    out mozIDOMWindowProxy aFocusedWindow);

 /**
  * Moves the selection caret within aWindow to the current focus.
  */
 [can_run_script]
 void moveCaretToFocus(in mozIDOMWindowProxy aWindow);

 /***
  * Check if given element (or potentially a descendant, see setFocus) is
  * focusable.
  */
 [can_run_script]
 boolean elementIsFocusable(in Element aElement, in unsigned long aFlags);

 /*
  * Raise the window when switching focus
  */
 const unsigned long FLAG_RAISE = 1 << 0;

 /**
  * Do not scroll the element to focus into view.
  */
 const unsigned long FLAG_NOSCROLL = 1 << 1;

 /**
  * 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 = 1 << 2;

 /**
  * This flag is only used when passed to moveFocus. If set, focus is never
  * moved to the parent frame of the starting element's document, instead
  * iterating around to the beginning of that document again. Child frames
  * are navigated as normal.
  */
 const unsigned long FLAG_NOPARENTFRAME =  1 << 3;

 /**
  * This flag is used for window and element focus operations to signal
  * whether the caller is system or non system.
  */
 const unsigned long FLAG_NONSYSTEMCALLER = 1 << 4;

 /**
  * Focus is changing due to a mouse operation, for instance the mouse was
  * clicked on an element.
  */
 const unsigned long FLAG_BYMOUSE = 1 << 12;

 /**
  * 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 = 1 << 13;

 /**
  * 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 = 1 << 14;

 /**
  * Do not show a ring around the element to focus, if this is not a text
  * control, regardless of other state.
  */
 const unsigned long FLAG_NOSHOWRING = 1 << 15;

 /**
  * Always show the focus ring or other indicator of focus, regardless of
  * other state. Overrides FLAG_NOSHOWRING.
  */
 const unsigned long FLAG_SHOWRING = 1 << 16;

 /**
  * Focus is changing due to a touch operation that generated a mouse event.
  * Normally used in conjunction with FLAG_BYMOUSE.
  */
 const unsigned long FLAG_BYTOUCH = 1 << 17;

 /** Focus is changing due to a JS focus() call or similar operation. */
 const unsigned long FLAG_BYJS = 1 << 18;

 /** Focus is changing due to a long press operation by touch or mouse. */
 const unsigned long FLAG_BYLONGPRESS = 1 << 19;

 /** Mask with all the focus methods. */
 const unsigned long METHOD_MASK = FLAG_BYMOUSE | FLAG_BYKEY | FLAG_BYMOVEFOCUS | FLAG_BYTOUCH | FLAG_BYJS | FLAG_BYLONGPRESS;

 /** Mask with all the focus methods, plus the SHOW / NOSHOWRING flags. */
 const unsigned long METHODANDRING_MASK = METHOD_MASK | FLAG_SHOWRING | FLAG_NOSHOWRING;

 // 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;

 /** move focus to the first focusable document */
 const unsigned long MOVEFOCUS_FIRSTDOC = 9;
 /** move focus to the last focusable document */
 const unsigned long MOVEFOCUS_LASTDOC = 10;
};