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/* -*- 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
* The origin of this IDL file is
* Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
* liability, trademark and document use rules apply.
// To implement FontFaceSet's iterator until we can use setlike.
dictionary FontFaceSetIteratorResult
required any value;
required boolean done;
// To implement FontFaceSet's iterator until we can use setlike.
interface FontFaceSetIterator {
[Throws] FontFaceSetIteratorResult next();
callback FontFaceSetForEachCallback = undefined (FontFace value, FontFace key, FontFaceSet set);
enum FontFaceSetLoadStatus { "loading", "loaded" };
interface FontFaceSet : EventTarget {
// Bug 1072762 is for the FontFaceSet constructor.
// constructor(sequence<FontFace> initialFaces);
// Emulate setlike behavior until we can use that directly.
readonly attribute unsigned long size;
[Throws] undefined add(FontFace font);
boolean has(FontFace font);
boolean delete(FontFace font);
undefined clear();
[NewObject] FontFaceSetIterator entries();
// Iterator keys();
[NewObject, Alias=keys, Alias="@@iterator"] FontFaceSetIterator values();
[Throws] undefined forEach(FontFaceSetForEachCallback cb, optional any thisArg);
// -- events for when loading state changes
attribute EventHandler onloading;
attribute EventHandler onloadingdone;
attribute EventHandler onloadingerror;
// check and start loads if appropriate
// and fulfill promise when all loads complete
[NewObject] Promise<sequence<FontFace>> load(UTF8String font, optional DOMString text = " ");
// return whether all fonts in the fontlist are loaded
// (does not initiate load if not available)
[Throws] boolean check(UTF8String font, optional DOMString text = " ");
// async notification that font loading and layout operations are done
[Throws] readonly attribute Promise<undefined> ready;
// loading state, "loading" while one or more fonts loading, "loaded" otherwise
readonly attribute FontFaceSetLoadStatus status;