зеркало из https://github.com/mozilla/gecko-dev.git
141 строка
4.9 KiB
Plaintext
141 строка
4.9 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsISupports.idl"
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%{C++
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#define NS_ENUMERATOR_FALSE 1
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%}
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/**
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* Used to enumerate over elements defined by its implementor.
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* Although hasMoreElements() can be called independently of getNext(),
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* getNext() must be pre-ceeded by a call to hasMoreElements(). There is
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* no way to "reset" an enumerator, once you obtain one.
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*
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* @status FROZEN
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* @version 1.0
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*/
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[scriptable, uuid(D1899240-F9D2-11D2-BDD6-000064657374)]
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interface nsISimpleEnumerator : nsISupports {
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/**
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* Called to determine whether or not the enumerator has
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* any elements that can be returned via getNext(). This method
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* is generally used to determine whether or not to initiate or
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* continue iteration over the enumerator, though it can be
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* called without subsequent getNext() calls. Does not affect
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* internal state of enumerator.
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*
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* @see getNext()
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* @return PR_TRUE if there are remaining elements in the enumerator.
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* PR_FALSE if there are no more elements in the enumerator.
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*/
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boolean hasMoreElements();
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/**
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* Called to retrieve the next element in the enumerator. The "next"
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* element is the first element upon the first call. Must be
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* pre-ceeded by a call to hasMoreElements() which returns PR_TRUE.
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* This method is generally called within a loop to iterate over
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* the elements in the enumerator.
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*
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* @see hasMoreElements()
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* @return NS_OK if the call succeeded in returning a non-null
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* value through the out parameter.
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* NS_ERROR_FAILURE if there are no more elements
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* to enumerate.
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* @return the next element in the enumeration.
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*/
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nsISupports getNext();
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};
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/*
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* DO NOT USE THIS INTERFACE. IT IS HORRIBLY BROKEN, USES NS_COMFALSE
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* AND IS BASICALLY IMPOSSIBLE TO USE CORRECTLY THROUGH PROXIES OR
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* XPCONNECT. IF YOU SEE NEW USES OF THIS INTERFACE IN CODE YOU ARE
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* REVIEWING, YOU SHOULD INSIST ON nsISimpleEnumerator.
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*
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* DON'T MAKE ME COME OVER THERE.
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*/
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[scriptable, uuid(ad385286-cbc4-11d2-8cca-0060b0fc14a3)]
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interface nsIEnumerator : nsISupports {
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/** First will reset the list. will return NS_FAILED if no items
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*/
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void first();
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/** Next will advance the list. will return failed if already at end
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*/
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void next();
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/** CurrentItem will return the CurrentItem item it will fail if the
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* list is empty
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*/
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nsISupports currentItem();
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/** return if the collection is at the end. that is the beginning following
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* a call to Prev and it is the end of the list following a call to next
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*/
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void isDone();
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};
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[uuid(75f158a0-cadd-11d2-8cca-0060b0fc14a3)]
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interface nsIBidirectionalEnumerator : nsIEnumerator {
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/** Last will reset the list to the end. will return NS_FAILED if no items
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*/
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void last();
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/** Prev will decrement the list. will return failed if already at beginning
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*/
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void prev();
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};
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%{C++
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extern "C" NS_COM nsresult
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NS_NewEmptyEnumerator(nsISimpleEnumerator** aResult);
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// Construct and return an implementation of a "conjoining enumerator." This
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// enumerator lets you string together two other enumerators into one sequence.
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// The result is an nsIBidirectionalEnumerator, but if either input is not
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// also bidirectional, the Last and Prev operations will fail.
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extern "C" NS_COM nsresult
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NS_NewConjoiningEnumerator(nsIEnumerator* first, nsIEnumerator* second,
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nsIBidirectionalEnumerator* *aInstancePtrResult);
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// Construct and return an implementation of a "union enumerator." This
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// enumerator will only return elements that are found in both constituent
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// enumerators.
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extern "C" NS_COM nsresult
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NS_NewUnionEnumerator(nsIEnumerator* first, nsIEnumerator* second,
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nsIEnumerator* *aInstancePtrResult);
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// Construct and return an implementation of an "intersection enumerator." This
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// enumerator will return elements that are found in either constituent
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// enumerators, eliminating duplicates.
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extern "C" NS_COM nsresult
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NS_NewIntersectionEnumerator(nsIEnumerator* first, nsIEnumerator* second,
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nsIEnumerator* *aInstancePtrResult);
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%}
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