зеркало из https://github.com/mozilla/pjs.git
293 строки
7.1 KiB
C++
293 строки
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "MPL"); you may not use this file except in
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* compliance with the MPL. You may obtain a copy of the MPL at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the MPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the MPL
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* for the specific language governing rights and limitations under the
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* MPL.
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*
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* The Initial Developer of this code under the MPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2000 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsCOMPtr.h"
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#include "nsIContentIterator.h"
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#include "nsIPresContext.h"
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#include "nsIFrame.h"
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#include "nsIContent.h"
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#include "nsIEnumerator.h"
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#include "nsFrameList.h"
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class nsFrameContentIterator : public nsIContentIterator
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{
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public:
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nsFrameContentIterator(nsIPresContext* aPresContext, nsIFrame* aFrame);
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virtual ~nsFrameContentIterator();
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// nsISupports
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NS_DECL_ISUPPORTS
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// nsIContentIterator
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NS_IMETHOD Init(nsIContent* aRoot);
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NS_IMETHOD Init(nsIDOMRange* aRange);
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NS_IMETHOD First();
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NS_IMETHOD Last();
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NS_IMETHOD Next();
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NS_IMETHOD Prev();
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NS_IMETHOD CurrentNode(nsIContent **aNode);
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NS_IMETHOD IsDone();
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NS_IMETHOD PositionAt(nsIContent* aCurNode);
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private:
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nsCOMPtr<nsIPresContext> mPresContext;
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nsIFrame* mParentFrame;
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nsIFrame* mCurrentChild;
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PRBool mIsDone;
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};
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nsFrameContentIterator::nsFrameContentIterator(nsIPresContext* aPresContext,
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nsIFrame* aFrame)
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: mPresContext(aPresContext), mParentFrame(aFrame), mIsDone(PR_FALSE)
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{
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First();
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}
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NS_IMPL_ISUPPORTS1(nsFrameContentIterator, nsIContentIterator);
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nsFrameContentIterator::~nsFrameContentIterator()
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{
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}
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NS_IMETHODIMP
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nsFrameContentIterator::Init(nsIContent* aRoot)
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{
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::Init(nsIDOMRange* aRange)
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{
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::First()
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{
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// Get the first child frame and make it the current node
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mParentFrame->FirstChild(mPresContext, nsnull, &mCurrentChild);
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if (!mCurrentChild) {
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return NS_ERROR_FAILURE;
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}
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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static nsIFrame*
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GetNextChildFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null pointer");
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// Get the last-in-flow
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aFrame = aFrame->GetLastInFlow();
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// Get its next sibling
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nsIFrame* nextSibling;
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aFrame->GetNextSibling(&nextSibling);
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// If there's no next sibling, then check if the parent frame
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// has a next-in-flow and look there
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if (!nextSibling) {
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nsIFrame* parent;
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aFrame->GetParent(&parent);
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parent->GetNextInFlow(&parent);
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if (parent) {
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parent->FirstChild(aPresContext, nsnull, &nextSibling);
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}
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}
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return nextSibling;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::Last()
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{
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nsIFrame* nextChild;
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// Starting with the first child walk and find the last child
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mCurrentChild = nsnull;
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mParentFrame->FirstChild(mPresContext, nsnull, &nextChild);
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while (nextChild) {
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mCurrentChild = nextChild;
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nextChild = ::GetNextChildFrame(mPresContext, nextChild);
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}
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if (!mCurrentChild) {
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return NS_ERROR_FAILURE;
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}
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::Next()
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{
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nsIFrame* nextChild = ::GetNextChildFrame(mPresContext, mCurrentChild);
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if (nextChild) {
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// Advance to the next child
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mCurrentChild = nextChild;
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// If we're at the end then the collection is at the end
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mIsDone = (nsnull == ::GetNextChildFrame(mPresContext, mCurrentChild));
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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static nsIFrame*
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GetPrevChildFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null pointer");
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// Get its previous sibling. Because we have a singly linked list we
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// need to search from the first child
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nsIFrame* parent;
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nsIFrame* firstChild;
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nsIFrame* prevSibling;
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aFrame->GetParent(&parent);
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parent->FirstChild(aPresContext, nsnull, &firstChild);
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NS_ASSERTION(firstChild, "parent has no first child");
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nsFrameList frameList(firstChild);
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prevSibling = frameList.GetPrevSiblingFor(aFrame);
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// If there's no previous sibling, then check if the parent frame
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// has a prev-in-flow and look there
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if (!prevSibling) {
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parent->GetPrevInFlow(&parent);
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if (parent) {
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parent->FirstChild(aPresContext, nsnull, &firstChild);
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frameList.SetFrames(firstChild);
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prevSibling = frameList.LastChild();
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}
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}
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// Get the first-in-flow
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while (PR_TRUE) {
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nsIFrame* prevInFlow;
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prevSibling->GetPrevInFlow(&prevInFlow);
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if (prevInFlow) {
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prevSibling = prevInFlow;
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} else {
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break;
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}
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}
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return prevSibling;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::Prev()
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{
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nsIFrame* prevChild = ::GetPrevChildFrame(mPresContext, mCurrentChild);
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if (prevChild) {
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// Make the previous child the current child
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mCurrentChild = prevChild;
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// If we're at the beginning then the collection is at the end
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mIsDone = (nsnull == ::GetPrevChildFrame(mPresContext, mCurrentChild));
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::CurrentNode(nsIContent **aNode)
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{
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if (mCurrentChild) {
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mCurrentChild->GetContent(aNode);
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return NS_OK;
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} else {
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*aNode = nsnull;
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return NS_ERROR_FAILURE;
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}
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}
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NS_IMETHODIMP
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nsFrameContentIterator::IsDone()
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{
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return mIsDone ? NS_OK : NS_ENUMERATOR_FALSE;
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}
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NS_IMETHODIMP
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nsFrameContentIterator::PositionAt(nsIContent* aCurNode)
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{
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nsIFrame* child;
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// Starting with the first child frame search for the child frame
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// with the matching content object
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mParentFrame->FirstChild(mPresContext, nsnull, &child);
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while (child) {
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nsCOMPtr<nsIContent> content;
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child->GetContent(getter_AddRefs(content));
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if (content.get() == aCurNode) {
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break;
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}
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child = ::GetNextChildFrame(mPresContext, child);
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}
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if (child) {
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// Make it the current child
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mCurrentChild = child;
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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nsresult
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NS_NewFrameContentIterator(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIContentIterator** aIterator)
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{
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NS_ENSURE_ARG_POINTER(aIterator);
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if (!aIterator) {
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return NS_ERROR_NULL_POINTER;
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}
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NS_ENSURE_ARG_POINTER(aFrame);
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if (!aFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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// Make sure the frame corresponds to generated content
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#ifdef DEBUG
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nsFrameState frameState;
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aFrame->GetFrameState(&frameState);
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NS_ASSERTION(frameState & NS_FRAME_GENERATED_CONTENT, "unexpected frame");
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#endif
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nsFrameContentIterator* it = new nsFrameContentIterator(aPresContext, aFrame);
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if (!it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(NS_GET_IID(nsIContentIterator), (void **)aIterator);
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}
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