mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
87 lines
3.5 KiB
JavaScript
87 lines
3.5 KiB
JavaScript
/* 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/. */
|
|
|
|
this.EXPORTED_SYMBOLS = [
|
|
"onSpellCheck",
|
|
];
|
|
|
|
const SPELL_CHECK_ENDED_TOPIC = "inlineSpellChecker-spellCheck-ended";
|
|
const SPELL_CHECK_STARTED_TOPIC = "inlineSpellChecker-spellCheck-started";
|
|
|
|
const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
|
|
|
|
/**
|
|
* Waits until spell checking has stopped on the given element.
|
|
*
|
|
* When a spell check is pending, this waits indefinitely until the spell check
|
|
* ends. When a spell check is not pending, it waits a small number of turns of
|
|
* the event loop: if a spell check begins, it resumes waiting indefinitely for
|
|
* the end, and otherwise it stops waiting and calls the callback.
|
|
*
|
|
* This this can therefore trap spell checks that have not started at the time
|
|
* of calling, spell checks that have already started, multiple consecutive
|
|
* spell checks, and the absence of spell checks altogether.
|
|
*
|
|
* @param editableElement The element being spell checked.
|
|
* @param callback Called when spell check has completed or enough turns
|
|
* of the event loop have passed to determine it has not
|
|
* started.
|
|
*/
|
|
function onSpellCheck(editableElement, callback) {
|
|
let editor = editableElement.editor;
|
|
if (!editor) {
|
|
let win = editableElement.ownerDocument.defaultView;
|
|
editor = win.QueryInterface(Ci.nsIInterfaceRequestor).
|
|
getInterface(Ci.nsIWebNavigation).
|
|
QueryInterface(Ci.nsIInterfaceRequestor).
|
|
getInterface(Ci.nsIEditingSession).
|
|
getEditorForWindow(win);
|
|
}
|
|
if (!editor)
|
|
throw new Error("Unable to find editor for element " + editableElement);
|
|
|
|
try {
|
|
// False is important here. Pass false so that the inline spell checker
|
|
// isn't created if it doesn't already exist.
|
|
var isc = editor.getInlineSpellChecker(false);
|
|
}
|
|
catch (err) {
|
|
// getInlineSpellChecker throws if spell checking is not enabled instead of
|
|
// just returning null, which seems kind of lame. (Spell checking is not
|
|
// enabled on Android.) The point here is only to determine whether spell
|
|
// check is pending, and if getInlineSpellChecker throws, then it's not
|
|
// pending.
|
|
}
|
|
let waitingForEnded = isc && isc.spellCheckPending;
|
|
let count = 0;
|
|
|
|
function observe(subj, topic, data) {
|
|
if (subj != editor)
|
|
return;
|
|
count = 0;
|
|
let expectedTopic = waitingForEnded ? SPELL_CHECK_ENDED_TOPIC :
|
|
SPELL_CHECK_STARTED_TOPIC;
|
|
if (topic != expectedTopic)
|
|
Cu.reportError("Expected " + expectedTopic + " but got " + topic + "!");
|
|
waitingForEnded = !waitingForEnded;
|
|
}
|
|
|
|
let os = Cc["@mozilla.org/observer-service;1"].
|
|
getService(Ci.nsIObserverService);
|
|
os.addObserver(observe, SPELL_CHECK_STARTED_TOPIC, false);
|
|
os.addObserver(observe, SPELL_CHECK_ENDED_TOPIC, false);
|
|
|
|
let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
|
|
timer.init(function tick() {
|
|
// Wait an arbitrarily large number -- 50 -- turns of the event loop before
|
|
// declaring that no spell checks will start.
|
|
if (waitingForEnded || ++count < 50)
|
|
return;
|
|
timer.cancel();
|
|
os.removeObserver(observe, SPELL_CHECK_STARTED_TOPIC);
|
|
os.removeObserver(observe, SPELL_CHECK_ENDED_TOPIC);
|
|
callback();
|
|
}, 0, Ci.nsITimer.TYPE_REPEATING_SLACK);
|
|
};
|