340 lines
11 KiB
C++
340 lines
11 KiB
C++
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 The University Of
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* Queensland. Portions created by The University Of Queensland are
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* Copyright (C) 1999 The University Of Queensland. 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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* Vilya Harvey <vilya@nag.co.uk>
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* Shyjan Mahamud <mahamud@cs.cmu.edu>
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*/
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#include "nsCOMPtr.h"
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#include "nsHTMLParts.h"
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#include "nsIHTMLContent.h"
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#include "nsFrame.h"
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#include "nsLineLayout.h"
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#include "nsHTMLIIDs.h"
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#include "nsIPresContext.h"
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#include "nsHTMLAtoms.h"
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#include "nsUnitConversion.h"
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#include "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsINameSpaceManager.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsStyleUtil.h"
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#include "nsMathMLmsqrtFrame.h"
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//
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// <msqrt> and <mroot> -- form a radical - implementation
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//
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//NOTE:
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// The code assumes that TeX fonts are picked.
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// There is no fall-back to draw the branches of the sqrt explicitly
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// in the case where TeX fonts are not there. In general, there are no
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// fall-back(s) in MathML when some (freely-downloadable) fonts are missing.
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// Otherwise, this will add much work and unnecessary complexity to the core
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// MathML engine. Assuming that authors have the free fonts is part of the
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// deal. We are not responsible for cases of misconfigurations out there.
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// additional style context to be used by our MathMLChar.
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#define NS_SQR_CHAR_STYLE_CONTEXT_INDEX 0
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static const PRUnichar kSqrChar = PRUnichar(0x221A);
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nsresult
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NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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nsMathMLmsqrtFrame* it = new (aPresShell) nsMathMLmsqrtFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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nsMathMLmsqrtFrame::nsMathMLmsqrtFrame() :
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mSqrChar(),
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mBarRect()
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{
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}
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nsMathMLmsqrtFrame::~nsMathMLmsqrtFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmsqrtFrame::Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv = nsMathMLContainerFrame::Init(aPresContext, aContent, aParent,
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aContext, aPrevInFlow);
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// No need to tract the style context given to our MathML char.
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// The Style System will use Get/SetAdditionalStyleContext() to keep it
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// up-to-date if dynamic changes arise.
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nsAutoString sqrChar; sqrChar.Assign(kSqrChar);
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mSqrChar.SetData(aPresContext, sqrChar);
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ResolveMathMLCharStyle(aPresContext, mContent, mStyleContext, &mSqrChar, PR_TRUE);
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return rv;
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}
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NS_IMETHODIMP
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nsMathMLmsqrtFrame::InheritAutomaticData(nsIPresContext* aPresContext,
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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(aPresContext, 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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NS_IMETHODIMP
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nsMathMLmsqrtFrame::TransmitAutomaticData(nsIPresContext* aPresContext)
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{
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// 1. The REC says:
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// The <msqrt> element leaves both attributes [displaystyle and scriptlevel]
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// unchanged within all its arguments.
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// 2. The TeXBook (Ch 17. p.141) says that \sqrt is cramped
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UpdatePresentationDataFromChildAt(aPresContext, 0, -1, 0,
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NS_MATHML_COMPRESSED,
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NS_MATHML_COMPRESSED);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmsqrtFrame::Paint(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer,
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PRUint32 aFlags)
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{
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/////////////
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// paint the content we are square-rooting
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nsresult rv = nsMathMLContainerFrame::Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer);
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/////////////
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// paint the sqrt symbol
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if (!NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
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mSqrChar.Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer, this);
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if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
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// paint the overline bar
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const nsStyleColor *color = NS_STATIC_CAST(const nsStyleColor*,
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mStyleContext->GetStyleData(eStyleStruct_Color));
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aRenderingContext.SetColor(color->mColor);
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aRenderingContext.FillRect(mBarRect);
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}
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#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
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// for visual debug
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if (NS_MATHML_PAINT_BOUNDING_METRICS(mPresentationData.flags)) {
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nsRect rect;
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mSqrChar.GetRect(rect);
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nsBoundingMetrics bm;
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mSqrChar.GetBoundingMetrics(bm);
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aRenderingContext.SetColor(NS_RGB(255,0,0));
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nscoord x = rect.x + bm.leftBearing;
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nscoord y = rect.y;
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nscoord w = bm.rightBearing - bm.leftBearing;
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nscoord h = bm.ascent + bm.descent;
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aRenderingContext.DrawRect(x,y,w,h);
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}
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#endif
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}
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return rv;
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}
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NS_IMETHODIMP
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nsMathMLmsqrtFrame::Reflow(nsIPresContext* 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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///////////////
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// Let the base class format our content like an inferred mrow
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nsHTMLReflowMetrics baseSize(aDesiredSize);
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nsresult rv = nsMathMLContainerFrame::Reflow(aPresContext, baseSize,
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aReflowState, aStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
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if (NS_FAILED(rv)) return rv;
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nsBoundingMetrics bmSqr, bmBase;
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bmBase = baseSize.mBoundingMetrics;
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////////////
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// Prepare the radical symbol and the overline bar
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nsIRenderingContext& renderingContext = *aReflowState.rendContext;
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const nsStyleFont *font = NS_STATIC_CAST(const nsStyleFont*,
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mStyleContext->GetStyleData(eStyleStruct_Font));
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renderingContext.SetFont(font->mFont);
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nsCOMPtr<nsIFontMetrics> fm;
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renderingContext.GetFontMetrics(*getter_AddRefs(fm));
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nscoord ruleThickness, leading, em;
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GetRuleThickness(renderingContext, fm, ruleThickness);
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// get the leading to be left at the top of the resulting frame
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// this seems more reliable than using fm->GetLeading() on suspicious fonts
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GetEmHeight(fm, em);
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leading = nscoord(0.2f * em);
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// Rule 11, App. G, TeXbook
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// psi = clearance between rule and content
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nscoord phi = 0, psi = 0;
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if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
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fm->GetXHeight(phi);
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else
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phi = ruleThickness;
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psi = ruleThickness + phi/4;
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// Stretch the radical symbol to the appropriate height if it is not big enough.
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nsBoundingMetrics contSize = bmBase;
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contSize.ascent = ruleThickness;
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contSize.descent = bmBase.ascent + bmBase.descent + psi;
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// height(radical) should be >= height(base) + psi + ruleThickness
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nsBoundingMetrics radicalSize;
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mSqrChar.Stretch(aPresContext, renderingContext,
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NS_STRETCH_DIRECTION_VERTICAL,
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contSize, radicalSize,
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NS_STRETCH_LARGER);
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// radicalSize have changed at this point, and should match with
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// the bounding metrics of the char
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mSqrChar.GetBoundingMetrics(bmSqr);
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// According to TeX, the ascent of the returned radical should be
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// the thickness of the overline
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ruleThickness = bmSqr.ascent;
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// make sure that the rule appears on the screen
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float p2t;
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aPresContext->GetScaledPixelsToTwips(&p2t);
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nscoord onePixel = NSIntPixelsToTwips(1, p2t);
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if (ruleThickness < onePixel) {
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ruleThickness = onePixel;
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}
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// adjust clearance psi to absorb any excess difference if any
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// in height between radical and content
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if (bmSqr.descent > (bmBase.ascent + bmBase.descent) + psi)
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psi = (psi + bmSqr.descent - (bmBase.ascent + bmBase.descent))/2;
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nscoord dx = 0, dy = 0;
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// place the radical symbol and the radical bar
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dy = leading; // leave a leading at the top
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mSqrChar.SetRect(nsRect(dx, dy, bmSqr.width, bmSqr.ascent + bmSqr.descent));
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dx = bmSqr.width;
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mBarRect.SetRect(dx, dy, bmBase.width, ruleThickness);
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// Update the desired size for the container.
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// the baseline will be that of the base.
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mBoundingMetrics.ascent = bmBase.ascent + psi + ruleThickness;
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mBoundingMetrics.descent =
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PR_MAX(bmBase.descent, (bmSqr.descent - (bmBase.ascent + psi)));
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mBoundingMetrics.width = bmSqr.width + bmBase.width;
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mBoundingMetrics.leftBearing = bmSqr.leftBearing;
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mBoundingMetrics.rightBearing = bmSqr.width +
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PR_MAX(bmBase.width, bmBase.rightBearing); // take also care of the rule
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aDesiredSize.ascent = bmBase.ascent + psi + ruleThickness + leading;
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aDesiredSize.descent =
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PR_MAX(baseSize.descent, (mBoundingMetrics.descent + ruleThickness));
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aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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mReference.x = 0;
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mReference.y = aDesiredSize.ascent;
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//////////////////
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// Adjust the origins to leave room for the sqrt char and the overline bar
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nsPoint origin;
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dx = radicalSize.width;
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dy = aDesiredSize.ascent - baseSize.ascent;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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childFrame->GetOrigin(origin);
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childFrame->MoveTo(aPresContext, origin.x + dx, origin.y + dy);
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childFrame->GetNextSibling(&childFrame);
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}
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if (nsnull != aDesiredSize.maxElementSize) {
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aDesiredSize.maxElementSize->width = aDesiredSize.width;
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aDesiredSize.maxElementSize->height = aDesiredSize.height;
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}
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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aStatus = NS_FRAME_COMPLETE;
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return NS_OK;
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}
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// ----------------------
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// the Style System will use these to pass the proper style context to our MathMLChar
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NS_IMETHODIMP
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nsMathMLmsqrtFrame::GetAdditionalStyleContext(PRInt32 aIndex,
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nsIStyleContext** aStyleContext) const
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{
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NS_PRECONDITION(aStyleContext, "null OUT ptr");
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if (aIndex < 0) {
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return NS_ERROR_INVALID_ARG;
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}
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*aStyleContext = nsnull;
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switch (aIndex) {
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case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
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mSqrChar.GetStyleContext(aStyleContext);
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break;
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default:
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return NS_ERROR_INVALID_ARG;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmsqrtFrame::SetAdditionalStyleContext(PRInt32 aIndex,
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nsIStyleContext* aStyleContext)
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{
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if (aIndex < 0) {
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return NS_ERROR_INVALID_ARG;
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}
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switch (aIndex) {
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case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
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mSqrChar.SetStyleContext(aStyleContext);
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break;
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}
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return NS_OK;
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}
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