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
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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this.EXPORTED_SYMBOLS = [
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"onSpellCheck",
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];
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const SPELL_CHECK_ENDED_TOPIC = "inlineSpellChecker-spellCheck-ended";
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const SPELL_CHECK_STARTED_TOPIC = "inlineSpellChecker-spellCheck-started";
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const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
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/**
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* Waits until spell checking has stopped on the given element.
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*
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* When a spell check is pending, this waits indefinitely until the spell check
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* ends. When a spell check is not pending, it waits a small number of turns of
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* the event loop: if a spell check begins, it resumes waiting indefinitely for
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* the end, and otherwise it stops waiting and calls the callback.
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*
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* This this can therefore trap spell checks that have not started at the time
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* of calling, spell checks that have already started, multiple consecutive
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* spell checks, and the absence of spell checks altogether.
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*
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* @param editableElement The element being spell checked.
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* @param callback Called when spell check has completed or enough turns
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* of the event loop have passed to determine it has not
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* started.
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*/
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function onSpellCheck(editableElement, callback) {
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let editor = editableElement.editor;
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if (!editor) {
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let win = editableElement.ownerDocument.defaultView;
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editor = win.QueryInterface(Ci.nsIInterfaceRequestor).
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getInterface(Ci.nsIWebNavigation).
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QueryInterface(Ci.nsIInterfaceRequestor).
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getInterface(Ci.nsIEditingSession).
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getEditorForWindow(win);
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}
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if (!editor)
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throw new Error("Unable to find editor for element " + editableElement);
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try {
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// False is important here. Pass false so that the inline spell checker
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// isn't created if it doesn't already exist.
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var isc = editor.getInlineSpellChecker(false);
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}
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catch (err) {
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// getInlineSpellChecker throws if spell checking is not enabled instead of
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// just returning null, which seems kind of lame. (Spell checking is not
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// enabled on Android.) The point here is only to determine whether spell
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// check is pending, and if getInlineSpellChecker throws, then it's not
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// pending.
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}
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let waitingForEnded = isc && isc.spellCheckPending;
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let count = 0;
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function observe(subj, topic, data) {
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if (subj != editor)
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return;
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count = 0;
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let expectedTopic = waitingForEnded ? SPELL_CHECK_ENDED_TOPIC :
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SPELL_CHECK_STARTED_TOPIC;
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if (topic != expectedTopic)
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Cu.reportError("Expected " + expectedTopic + " but got " + topic + "!");
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waitingForEnded = !waitingForEnded;
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}
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let os = Cc["@mozilla.org/observer-service;1"].
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getService(Ci.nsIObserverService);
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os.addObserver(observe, SPELL_CHECK_STARTED_TOPIC, false);
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os.addObserver(observe, SPELL_CHECK_ENDED_TOPIC, false);
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let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
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timer.init(function tick() {
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// Wait an arbitrarily large number -- 50 -- turns of the event loop before
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// declaring that no spell checks will start.
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if (waitingForEnded || ++count < 50)
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return;
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timer.cancel();
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os.removeObserver(observe, SPELL_CHECK_STARTED_TOPIC);
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os.removeObserver(observe, SPELL_CHECK_ENDED_TOPIC);
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callback();
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}, 0, Ci.nsITimer.TYPE_REPEATING_SLACK);
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};
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