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43 lines
1.9 KiB
Plaintext
43 lines
1.9 KiB
Plaintext
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* 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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#include "nsISupports.idl"
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/**
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* This interface allows Firefox to expose different implementations of its own
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* classes to add-ons. Once an interposition is created, it must be assigned to
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* an add-on using Cu.setAddonInterposition (JS) or xpc::SetAddonInterposition
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* (C++). In both cases, the arguments should be the add-on ID and the
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* interposition object (which must be an nsIAddonInterposition). This must
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* happen before any compartments are created for the given add-on.
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*
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* Every time the add-on accesses a property on any object outside its own set
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* of compartments, XPConnect will call the interposition's
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* interpose method. If the interposition wants to replace the given
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* property, it should return a replacement property descriptor for it. If not,
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* it should return null.
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*/
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[scriptable,uuid(e5453950-d95a-11e3-9c1a-0800200c9a66)]
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interface nsIAddonInterposition : nsISupports
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{
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/**
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* Returns a replacement property descriptor for a browser object.
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*
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* @param addonId The ID of the add-on accessing the property.
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* @param target The browser object being accessed.
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* @param iface The IID of the interface the property is associated with. This
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* parameter is only available for XPCWrappedNative targets. As
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* such, it's only useful as an optimization to avoid
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* instanceof checks on the target.
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* @param prop The name of the property being accessed.
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* @return A property descriptor or null.
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*/
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jsval interpose(in jsval addonId,
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in jsval target,
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in nsIIDPtr iface,
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in jsval prop);
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};
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