зеркало из https://github.com/mozilla/pjs.git
233 строки
6.6 KiB
C++
233 строки
6.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mike Shaver <shaver@mozilla.org>
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* Randell Jesup <rjesup@wgate.com>
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* Chris Waterson <waterson@netscape.com>
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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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#ifndef nsReflowPath_h__
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#define nsReflowPath_h__
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#include "nscore.h"
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#include "pldhash.h"
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#include "nsReflowType.h"
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#include "nsVoidArray.h"
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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class nsIFrame;
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class nsHTMLReflowCommand;
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class nsIPresContext;
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/**
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* A reflow `path' that is a sparse tree the parallels the frame
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* hierarchy. This is used during an incremental reflow to record the
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* path which the reflow must trace through the frame hierarchy.
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*/
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class nsReflowPath
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{
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public:
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/**
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* Construct a reflow path object that parallels the specified
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* frame.
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*/
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nsReflowPath(nsIFrame *aFrame)
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: mFrame(aFrame),
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mReflowCommand(nsnull) {}
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~nsReflowPath();
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/**
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* An iterator for enumerating the reflow path's immediate
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* children.
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*/
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class iterator
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{
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protected:
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nsReflowPath *mNode;
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PRInt32 mIndex;
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friend class nsReflowPath;
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iterator(nsReflowPath *aNode, PRInt32 aIndex)
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: mNode(aNode), mIndex(aIndex) {}
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void
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Advance() { --mIndex; }
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public:
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iterator()
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: mNode(nsnull) {}
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iterator(const iterator &iter)
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: mNode(iter.mNode), mIndex(iter.mIndex) {}
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iterator &
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operator=(const iterator &iter) {
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mNode = iter.mNode;
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mIndex = iter.mIndex;
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return *this; }
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nsReflowPath *
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get() const {
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return NS_STATIC_CAST(nsReflowPath *, mNode->mChildren[mIndex]); }
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nsReflowPath *
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get() {
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return NS_STATIC_CAST(nsReflowPath *, mNode->mChildren[mIndex]); }
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nsIFrame *
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operator*() const {
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return get()->mFrame; }
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nsIFrame *&
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operator*() {
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return get()->mFrame; }
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iterator &
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operator++() { Advance(); return *this; }
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iterator
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operator++(int) {
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iterator temp(*this);
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Advance();
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return temp; }
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PRBool
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operator==(const iterator &iter) const {
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return (mNode == iter.mNode) && (mIndex == iter.mIndex); }
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PRBool
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operator!=(const iterator &iter) const {
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return !iter.operator==(*this); }
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};
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/**
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* Return an iterator that points to the first immediate child of
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* the reflow path.
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*/
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iterator FirstChild() { return iterator(this, mChildren.Count() - 1); }
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/**
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* Return an iterator that points `one past the end' of the
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* immediate children of the reflow path.
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*/
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iterator EndChildren() { return iterator(this, -1); }
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/**
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* Determine if the reflow path contains the specified frame as
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* one of its immediate children.
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*/
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PRBool
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HasChild(nsIFrame *aFrame) const {
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return GetSubtreeFor(aFrame) != nsnull; }
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/**
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* Return an iterator over the current reflow path that
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* corresponds to the specified child frame. Returns EndChildren
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* if aFrame is not an immediate child of the reflow path.
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*/
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iterator
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FindChild(nsIFrame *aFrame);
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/**
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* Remove the specified child frame from the reflow path, along
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* with any of its descendants. Does nothing if aFrame is not an
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* immediate child of the reflow path.
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*/
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void
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RemoveChild(nsIFrame *aFrame) {
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iterator iter = FindChild(aFrame);
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Remove(iter); }
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/**
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* Return the child reflow path that corresponds to the specified
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* frame, or null if the frame is not an immediate descendant.
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*/
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nsReflowPath *
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GetSubtreeFor(nsIFrame *aFrame) const;
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/**
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* Return the child reflow path that corresponds to the specified
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* frame, constructing a new child reflow path if one doesn't
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* exist already.
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*/
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nsReflowPath *
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EnsureSubtreeFor(nsIFrame *aFrame);
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/**
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* Remove the child reflow path that corresponds to the specified
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* iterator.
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*/
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void
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Remove(iterator &aIterator);
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#ifdef DEBUG
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/**
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* Recursively dump the reflow path object and its descendants.
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*/
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void
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Dump(nsIPresContext *aPresContext, FILE *aFile, int aDepth);
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#endif
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/**
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* The frame that this reflow path object is associated with.
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*/
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nsIFrame *mFrame;
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/**
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* If mFrame is the immediate target of an incremental reflow,
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* this contains the reflow command that targeted it. Otherwise,
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* this is null (and mFrame simply lies along the path to a target
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* frame). The reflow path object assumes ownership of the reflow
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* command.
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*/
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nsHTMLReflowCommand *mReflowCommand;
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protected:
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/**
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* The children of this reflow path; also contains pointers to
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* nsReflowPath objects.
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*/
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nsSmallVoidArray mChildren;
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friend class iterator;
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};
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#endif
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