зеркало из https://github.com/mozilla/pjs.git
479 строки
16 KiB
C++
479 строки
16 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: 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 MathML Project.
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*
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* The Initial Developer of the Original Code is
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* The University Of Queensland.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Roger B. Sidje <rbs@maths.uq.edu.au>
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* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
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* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
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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 "nsCRT.h" // to get NS_IS_SPACE
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#include "nsFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsMathMLmpaddedFrame.h"
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//
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// <mpadded> -- adjust space around content - implementation
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//
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#define NS_MATHML_SIGN_INVALID -1 // if the attribute is not there
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#define NS_MATHML_SIGN_UNSPECIFIED 0
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#define NS_MATHML_SIGN_MINUS 1
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#define NS_MATHML_SIGN_PLUS 2
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#define NS_MATHML_PSEUDO_UNIT_UNSPECIFIED 0
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#define NS_MATHML_PSEUDO_UNIT_ITSELF 1 // special
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#define NS_MATHML_PSEUDO_UNIT_WIDTH 2
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#define NS_MATHML_PSEUDO_UNIT_HEIGHT 3
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#define NS_MATHML_PSEUDO_UNIT_DEPTH 4
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#define NS_MATHML_PSEUDO_UNIT_LSPACE 5
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#define NS_MATHML_PSEUDO_UNIT_NAMEDSPACE 6
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nsIFrame*
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NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmpaddedFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmpaddedFrame)
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nsMathMLmpaddedFrame::~nsMathMLmpaddedFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmpaddedFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aParent);
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
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return NS_OK;
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}
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void
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nsMathMLmpaddedFrame::ProcessAttributes()
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{
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/*
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parse the attributes
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width = [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | h-unit | namedspace)
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height= [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | v-unit)
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depth = [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | v-unit)
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lspace= [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | h-unit)
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*/
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nsAutoString value;
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/* The REC says:
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There is one exceptional element, <mpadded>, whose attributes cannot be
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set with <mstyle>. When the attributes width, height and depth are specified
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on an <mstyle> element, they apply only to the <mspace/> element. Similarly,
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when lspace is set with <mstyle>, it applies only to the <mo> element.
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*/
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// See if attributes are local, don't access mstyle !
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// width
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mWidthSign = NS_MATHML_SIGN_INVALID;
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GetAttribute(mContent, nsnull, nsGkAtoms::width, value);
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if (!value.IsEmpty()) {
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ParseAttribute(value, mWidthSign, mWidth, mWidthPseudoUnit);
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}
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// height
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mHeightSign = NS_MATHML_SIGN_INVALID;
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GetAttribute(mContent, nsnull, nsGkAtoms::height, value);
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if (!value.IsEmpty()) {
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ParseAttribute(value, mHeightSign, mHeight, mHeightPseudoUnit);
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}
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// depth
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mDepthSign = NS_MATHML_SIGN_INVALID;
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GetAttribute(mContent, nsnull, nsGkAtoms::depth_, value);
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if (!value.IsEmpty()) {
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ParseAttribute(value, mDepthSign, mDepth, mDepthPseudoUnit);
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}
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// lspace
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mLeftSpaceSign = NS_MATHML_SIGN_INVALID;
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GetAttribute(mContent, nsnull, nsGkAtoms::lspace_, value);
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if (!value.IsEmpty()) {
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ParseAttribute(value, mLeftSpaceSign, mLeftSpace, mLeftSpacePseudoUnit);
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}
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}
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// parse an input string in the following format (see bug 148326 for testcases):
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// [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | css-unit | namedspace)
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PRBool
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nsMathMLmpaddedFrame::ParseAttribute(nsString& aString,
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PRInt32& aSign,
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nsCSSValue& aCSSValue,
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PRInt32& aPseudoUnit)
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{
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aCSSValue.Reset();
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aSign = NS_MATHML_SIGN_INVALID;
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_UNSPECIFIED;
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aString.CompressWhitespace(); // aString is not a const in this code
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PRInt32 stringLength = aString.Length();
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if (!stringLength)
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return PR_FALSE;
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nsAutoString number, unit;
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//////////////////////
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// see if the sign is there
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PRInt32 i = 0;
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if (aString[0] == '+') {
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aSign = NS_MATHML_SIGN_PLUS;
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i++;
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}
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else if (aString[0] == '-') {
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aSign = NS_MATHML_SIGN_MINUS;
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i++;
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}
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else
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aSign = NS_MATHML_SIGN_UNSPECIFIED;
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// skip any space after the sign
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if (i < stringLength && nsCRT::IsAsciiSpace(aString[i]))
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i++;
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// get the number
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PRBool gotDot = PR_FALSE, gotPercent = PR_FALSE;
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for (; i < stringLength; i++) {
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PRUnichar c = aString[i];
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if (gotDot && c == '.') {
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// error - two dots encountered
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aSign = NS_MATHML_SIGN_INVALID;
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return PR_FALSE;
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}
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if (c == '.')
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gotDot = PR_TRUE;
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else if (!nsCRT::IsAsciiDigit(c)) {
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break;
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}
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number.Append(c);
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}
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// catch error if we didn't enter the loop above... we could simply initialize
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// floatValue = 1, to cater for cases such as width="height", but that wouldn't
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// be in line with the spec which requires an explicit number
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if (number.IsEmpty()) {
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#ifdef NS_DEBUG
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printf("mpadded: attribute with bad numeric value: %s\n",
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NS_LossyConvertUTF16toASCII(aString).get());
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#endif
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aSign = NS_MATHML_SIGN_INVALID;
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return PR_FALSE;
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}
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PRInt32 errorCode;
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float floatValue = number.ToFloat(&errorCode);
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if (errorCode) {
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aSign = NS_MATHML_SIGN_INVALID;
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return PR_FALSE;
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}
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// skip any space after the number
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if (i < stringLength && nsCRT::IsAsciiSpace(aString[i]))
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i++;
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// see if this is a percentage-based value
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if (i < stringLength && aString[i] == '%') {
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i++;
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gotPercent = PR_TRUE;
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// skip any space after the '%' sign
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if (i < stringLength && nsCRT::IsAsciiSpace(aString[i]))
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i++;
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}
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// the remainder now should be a css-unit, or a pseudo-unit, or a named-space
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aString.Right(unit, stringLength - i);
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if (unit.IsEmpty()) {
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// also cater for the edge case of "0" for which the unit is optional
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if (gotPercent || !floatValue) {
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aCSSValue.SetPercentValue(floatValue / 100.0f);
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_ITSELF;
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return PR_TRUE;
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}
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/*
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else {
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// no explicit CSS unit and no explicit pseudo-unit...
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// In this case, the MathML REC suggests taking ems for
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// h-unit (width, lspace) or exs for v-unit (height, depth).
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// Here, however, we explicitly request authors to specify
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// the unit. This is more in line with the CSS REC (and
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// it allows keeping the code simpler...)
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}
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*/
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}
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else if (unit.EqualsLiteral("width")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_WIDTH;
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else if (unit.EqualsLiteral("height")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_HEIGHT;
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else if (unit.EqualsLiteral("depth")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_DEPTH;
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else if (unit.EqualsLiteral("lspace")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_LSPACE;
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else if (!gotPercent) { // percentage can only apply to a pseudo-unit
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// see if the unit is a named-space
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// XXX nsnull in ParseNamedSpacedValue()? don't access mstyle?
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if (ParseNamedSpaceValue(nsnull, unit, aCSSValue)) {
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// re-scale properly, and we know that the unit of the named-space is 'em'
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floatValue *= aCSSValue.GetFloatValue();
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aCSSValue.SetFloatValue(floatValue, eCSSUnit_EM);
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_NAMEDSPACE;
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return PR_TRUE;
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}
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// see if the input was just a CSS value
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number.Append(unit); // leave the sign out if it was there
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if (ParseNumericValue(number, aCSSValue))
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return PR_TRUE;
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}
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// if we enter here, we have a number that will act as a multiplier on a pseudo-unit
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if (aPseudoUnit != NS_MATHML_PSEUDO_UNIT_UNSPECIFIED) {
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if (gotPercent)
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aCSSValue.SetPercentValue(floatValue / 100.0f);
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else
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aCSSValue.SetFloatValue(floatValue, eCSSUnit_Number);
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return PR_TRUE;
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}
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#ifdef NS_DEBUG
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printf("mpadded: attribute with bad numeric value: %s\n",
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NS_LossyConvertUTF16toASCII(aString).get());
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#endif
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// if we reach here, it means we encounter an unexpected input
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aSign = NS_MATHML_SIGN_INVALID;
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return PR_FALSE;
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}
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void
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nsMathMLmpaddedFrame::UpdateValue(PRInt32 aSign,
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PRInt32 aPseudoUnit,
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const nsCSSValue& aCSSValue,
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nscoord aLeftSpace,
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const nsBoundingMetrics& aBoundingMetrics,
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nscoord& aValueToUpdate) const
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{
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nsCSSUnit unit = aCSSValue.GetUnit();
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if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
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nscoord scaler = 0, amount = 0;
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if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
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switch(aPseudoUnit) {
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case NS_MATHML_PSEUDO_UNIT_WIDTH:
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scaler = aBoundingMetrics.width;
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break;
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case NS_MATHML_PSEUDO_UNIT_HEIGHT:
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scaler = aBoundingMetrics.ascent;
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break;
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case NS_MATHML_PSEUDO_UNIT_DEPTH:
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scaler = aBoundingMetrics.descent;
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break;
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case NS_MATHML_PSEUDO_UNIT_LSPACE:
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scaler = aLeftSpace;
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break;
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default:
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// if we ever reach here, it would mean something is wrong
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// somewhere with the setup and/or the caller
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NS_ERROR("Unexpected Pseudo Unit");
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return;
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}
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}
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if (eCSSUnit_Number == unit)
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amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
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else if (eCSSUnit_Percent == unit)
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amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
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else
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amount = CalcLength(PresContext(), mStyleContext, aCSSValue);
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nscoord oldValue = aValueToUpdate;
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if (NS_MATHML_SIGN_PLUS == aSign)
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aValueToUpdate += amount;
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else if (NS_MATHML_SIGN_MINUS == aSign)
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aValueToUpdate -= amount;
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else
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aValueToUpdate = amount;
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/* The REC says:
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Dimensions that would be positive if the content was rendered normally
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cannot be made negative using <mpadded>; a positive dimension is set
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to 0 if it would otherwise become negative. Dimensions which are
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initially 0 can be made negative
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*/
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if (0 < oldValue && 0 > aValueToUpdate)
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aValueToUpdate = 0;
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}
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}
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NS_IMETHODIMP
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nsMathMLmpaddedFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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ProcessAttributes();
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///////////////
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// Let the base class format our content like an inferred mrow
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nsresult rv = nsMathMLContainerFrame::Reflow(aPresContext, aDesiredSize,
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aReflowState, aStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
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return rv;
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}
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/* virtual */ nsresult
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nsMathMLmpaddedFrame::Place(nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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nsresult rv =
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nsMathMLContainerFrame::Place(aRenderingContext, PR_FALSE, aDesiredSize);
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if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
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DidReflowChildren(GetFirstChild(nsnull));
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return rv;
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}
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nscoord height = mBoundingMetrics.ascent;
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nscoord depth = mBoundingMetrics.descent;
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// In MathML2 (http://www.w3.org/TR/MathML2/chapter3.html#presm.mpadded),
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// lspace is "the amount of space between the left edge of a bounding box
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// and the start of the rendering of its contents' bounding box" and the
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// default is zero.
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//
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// In MathML3 draft
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// http://www.w3.org/TR/2007/WD-MathML3-20070427/chapter3.html#id.3.3.6.2,
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// lspace is "the amount of space between the left edge of the bounding box
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// and the positioning poin [sic] of the mpadded element" and the default is
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// "same as content".
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//
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// In both cases, "MathML renderers should ensure that, except for the
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// effects of the attributes, relative spacing between the contents of
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// mpadded and surrounding MathML elements is not modified by replacing an
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// mpadded element with an mrow element with the same content."
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nscoord lspace = 0;
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// In MATHML3, "width" will be the bounding box width and "advancewidth" will
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// refer "to the horizontal distance between the positioning point of the
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// mpadded and the positioning point for the following content". MathML2
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// doesn't make the distinction.
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nscoord width = mBoundingMetrics.width;
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PRInt32 pseudoUnit;
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// update width
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pseudoUnit = (mWidthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_WIDTH : mWidthPseudoUnit;
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UpdateValue(mWidthSign, pseudoUnit, mWidth,
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lspace, mBoundingMetrics, width);
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// update "height" (this is the ascent in the terminology of the REC)
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pseudoUnit = (mHeightPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_HEIGHT : mHeightPseudoUnit;
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UpdateValue(mHeightSign, pseudoUnit, mHeight,
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lspace, mBoundingMetrics, height);
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// update "depth" (this is the descent in the terminology of the REC)
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pseudoUnit = (mDepthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_DEPTH : mDepthPseudoUnit;
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UpdateValue(mDepthSign, pseudoUnit, mDepth,
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lspace, mBoundingMetrics, depth);
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// update lspace -- should be *last* because lspace is overwritten!!
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pseudoUnit = (mLeftSpacePseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_LSPACE : mLeftSpacePseudoUnit;
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UpdateValue(mLeftSpaceSign, pseudoUnit, mLeftSpace,
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lspace, mBoundingMetrics, lspace);
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// do the padding now that we have everything
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// The idea here is to maintain the invariant that <mpadded>...</mpadded> (i.e.,
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// with no attributes) looks the same as <mrow>...</mrow>. But when there are
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// attributes, tweak our metrics and move children to achieve the desired visual
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// effects.
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if (mLeftSpaceSign != NS_MATHML_SIGN_INVALID) { // there was padding on the left
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// dismiss the left italic correction now (so that our parent won't correct us)
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mBoundingMetrics.leftBearing = 0;
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}
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if (mLeftSpaceSign != NS_MATHML_SIGN_INVALID ||
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mWidthSign != NS_MATHML_SIGN_INVALID) { // there was padding on the right
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// dismiss the right italic correction now (so that our parent won't correct us)
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mBoundingMetrics.width = PR_MAX(0, lspace + width);
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mBoundingMetrics.rightBearing = mBoundingMetrics.width;
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}
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nscoord dy = height - mBoundingMetrics.ascent;
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nscoord dx = lspace;
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mBoundingMetrics.ascent = height;
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mBoundingMetrics.descent = depth;
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aDesiredSize.ascent += dy;
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.height += dy + depth - mBoundingMetrics.descent;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.ascent;
|
|
|
|
if (aPlaceOrigin) {
|
|
// Finish reflowing child frames, positioning their origins.
|
|
PositionRowChildFrames(dx, aDesiredSize.ascent);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|