зеркало из https://github.com/mozilla/pjs.git
164 строки
5.4 KiB
C++
164 строки
5.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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 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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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsLayoutUtils.h"
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#include "nsIFrame.h"
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#include "nsIPresContext.h"
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#include "nsIContent.h"
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#include "nsFrameList.h"
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/**
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* A namespace class for static layout utilities.
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*/
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/**
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* GetFirstChildFrame returns the first "real" child frame of a
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* given frame. It will descend down into pseudo-frames (unless the
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* pseudo-frame is the :before generated frame).
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* @param aPresContext the prescontext
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* @param aFrame the frame
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* @param aFrame the frame's content node
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*/
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static nsIFrame*
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GetFirstChildFrame(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIContent* aContent)
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{
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NS_PRECONDITION(aFrame, "NULL frame pointer");
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nsIFrame* childFrame;
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// Get the first child frame
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aFrame->FirstChild(aPresContext, nsnull, &childFrame);
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// If the child frame is a pseudo-frame, then return its first child.
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// Note that the frame we create for the generated content is also a
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// pseudo-frame and so don't drill down in that case
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if (childFrame &&
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childFrame->IsPseudoFrame(aContent) &&
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!childFrame->IsGeneratedContentFrame()) {
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return GetFirstChildFrame(aPresContext, childFrame, aContent);
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}
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return childFrame;
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}
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/**
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* GetLastChildFrame returns the last "real" child frame of a
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* given frame. It will descend down into pseudo-frames (unless the
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* pseudo-frame is the :after generated frame).
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* @param aPresContext the prescontext
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* @param aFrame the frame
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* @param aFrame the frame's content node
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*/
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static nsIFrame*
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GetLastChildFrame(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIContent* aContent)
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{
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NS_PRECONDITION(aFrame, "NULL frame pointer");
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// Get the last in flow frame
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nsIFrame* lastInFlow = aFrame->GetLastInFlow();
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// Get the last child frame
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nsIFrame* firstChildFrame;
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lastInFlow->FirstChild(aPresContext, nsnull, &firstChildFrame);
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if (firstChildFrame) {
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nsFrameList frameList(firstChildFrame);
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nsIFrame* lastChildFrame = frameList.LastChild();
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NS_ASSERTION(lastChildFrame, "unexpected error");
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// Get the frame's first-in-flow. This matters in case the frame has
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// been continuted across multiple lines
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lastChildFrame = lastChildFrame->GetFirstInFlow();
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// If the last child frame is a pseudo-frame, then return its last child.
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// Note that the frame we create for the generated content is also a
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// pseudo-frame and so don't drill down in that case
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if (lastChildFrame &&
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lastChildFrame->IsPseudoFrame(aContent) &&
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!lastChildFrame->IsGeneratedContentFrame()) {
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return GetLastChildFrame(aPresContext, lastChildFrame, aContent);
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}
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return lastChildFrame;
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}
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return nsnull;
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}
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// static
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nsIFrame*
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nsLayoutUtils::GetBeforeFrame(nsIFrame* aFrame, nsIPresContext* aPresContext)
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{
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NS_PRECONDITION(aFrame, "NULL frame pointer");
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#ifdef DEBUG
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nsIFrame* prevInFlow = nsnull;
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aFrame->GetPrevInFlow(&prevInFlow);
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NS_ASSERTION(!prevInFlow, "aFrame must be first-in-flow");
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#endif
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nsCOMPtr<nsIContent> content;
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aFrame->GetContent(getter_AddRefs(content));
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nsIFrame* firstFrame = GetFirstChildFrame(aPresContext, aFrame, content);
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if (firstFrame && firstFrame->IsGeneratedContentFrame()) {
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return firstFrame;
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}
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return nsnull;
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}
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// static
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nsIFrame*
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nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame, nsIPresContext* aPresContext)
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{
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NS_PRECONDITION(aFrame, "NULL frame pointer");
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nsCOMPtr<nsIContent> content;
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aFrame->GetContent(getter_AddRefs(content));
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nsIFrame* lastFrame = GetLastChildFrame(aPresContext, aFrame, content);
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if (lastFrame && lastFrame->IsGeneratedContentFrame()) {
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return lastFrame;
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}
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return nsnull;
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}
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