docshell/base/nsITooltipTextProvider.idl
author Iain Ireland <iireland@mozilla.com>
Fri, 11 Jan 2019 18:05:36 +0000
changeset 453523 025feea5945bffc625e9cca2e23be51ee8670315
parent 420388 9013597c936e9145244293c908fa4f3da1ec38fc
child 475212 020c8c871c0d3b3920fe95935cfef06501976c0f
permissions -rw-r--r--
Bug 1480390: Move ForOfIterClose logic inside TryNoteIter r=tcampbell This patch was intended to be a pure refactoring of existing code with no side-effects, moving the logic for handling for-of/for-of-iterclose trynotes inside TryNoteIter to avoid duplicating logic in all users of TryNoteIter. However, it turns out that there was a subtle preexisting bug in TryNoteIter that is fixed by the refactoring. Specifically, the logic to skip from a for-of-iterclose to its enclosing for-of must run before the logic to skip trynotes based on stack depth. Otherwise, the stack depth code may filter out the enclosing for-of (see the attached test case for an example) and we will skip too many try-notes. Differential Revision: https://phabricator.services.mozilla.com/D14783

/* -*- Mode: C++; tab-width: 4; 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 "nsISupports.idl"

webidl Node;

/**
 * An interface implemented by a tooltip text provider service. This
 * service is called to discover what tooltip text is associated
 * with the node that the pointer is positioned over.
 *
 * Embedders may implement and register their own tooltip text provider
 * service if they wish to provide different tooltip text. 
 *
 * The default service returns the text stored in the TITLE
 * attribute of the node or a containing parent.
 *
 * @note
 * The tooltip text provider service is registered with the contract
 * defined in NS_TOOLTIPTEXTPROVIDER_CONTRACTID.
 *
 * @see nsITooltipListener
 * @see nsIComponentManager
 * @see Node
 */
[scriptable, uuid(b128a1e6-44f3-4331-8fbe-5af360ff21ee)]
interface nsITooltipTextProvider : nsISupports
{
    /**
     * Called to obtain the tooltip text for a node.
     *
     * @arg aNode      The node to obtain the text from.
     * @arg aText      The tooltip text.
     * @arg aDirection The text direction (ltr or rtl) to use
     *
     * @return <CODE>PR_TRUE</CODE> if tooltip text is associated
     *         with the node and was returned in the aText argument;
     *         <CODE>PR_FALSE</CODE> otherwise.
     */
    boolean getNodeText(in Node aNode, out wstring aText, out wstring aDirection);
};