mirror of
https://github.com/mozilla/gecko-dev.git
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288 lines
7.5 KiB
C++
288 lines
7.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h"
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#include "nsIContentIterator.h"
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#include "nsPresContext.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(nsPresContext* 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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virtual nsresult Init(nsIContent* aRoot);
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virtual nsresult Init(nsIDOMRange* aRange);
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virtual void First();
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virtual void Last();
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virtual void Next();
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virtual void Prev();
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virtual nsIContent *GetCurrentNode();
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virtual PRBool IsDone();
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virtual nsresult PositionAt(nsIContent* aCurNode);
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private:
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nsCOMPtr<nsPresContext> 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(nsPresContext* 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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nsresult
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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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nsresult
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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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void
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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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mCurrentChild = mParentFrame->GetFirstChild(nsnull);
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mIsDone = !mCurrentChild;
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}
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static nsIFrame*
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GetNextChildFrame(nsPresContext* 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 = aFrame->GetNextSibling();
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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 = aFrame->GetParent()->GetNextInFlow();
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if (parent) {
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nextSibling = parent->GetFirstChild(nsnull);
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}
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}
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return nextSibling;
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}
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void
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nsFrameContentIterator::Last()
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{
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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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nsIFrame* nextChild = mParentFrame->GetFirstChild(nsnull);
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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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mIsDone = !mCurrentChild;
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}
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void
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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;
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}
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// No next frame, we're done.
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mIsDone = PR_TRUE;
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}
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static nsIFrame*
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GetPrevChildFrame(nsPresContext* 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 = aFrame->GetParent();
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nsIFrame* prevSibling;
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nsIFrame* firstChild = parent->GetFirstChild(nsnull);
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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 = parent->GetPrevInFlow();
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if (parent) {
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firstChild = parent->GetFirstChild(nsnull);
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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 = prevSibling->GetPrevInFlow();
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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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void
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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;
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}
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// No previous frame, we're done.
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mIsDone = PR_TRUE;
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}
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nsIContent *
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nsFrameContentIterator::GetCurrentNode()
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{
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if (mCurrentChild && !mIsDone) {
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return mCurrentChild->GetContent();
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}
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return nsnull;
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}
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PRBool
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nsFrameContentIterator::IsDone()
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{
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return mIsDone;
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}
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nsresult
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nsFrameContentIterator::PositionAt(nsIContent* aCurNode)
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{
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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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nsIFrame* child = mParentFrame->GetFirstChild(nsnull);
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while (child) {
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if (child->GetContent() == 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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}
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return NS_OK;
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}
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nsresult
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NS_NewFrameContentIterator(nsPresContext* 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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NS_ASSERTION(aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT, "unexpected frame");
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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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