165 lines
4.9 KiB
C++
165 lines
4.9 KiB
C++
/*
|
|
* The contents of this file are subject to the Mozilla Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is Mozilla MathML Project.
|
|
*
|
|
* The Initial Developer of the Original Code is The University Of
|
|
* Queensland. Portions created by The University Of Queensland are
|
|
* Copyright (C) 1999 The University Of Queensland. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Roger B. Sidje <rbs@maths.uq.edu.au>
|
|
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
|
|
*/
|
|
|
|
|
|
#include "nsCOMPtr.h"
|
|
#include "nsHTMLParts.h"
|
|
#include "nsIHTMLContent.h"
|
|
#include "nsFrame.h"
|
|
#include "nsLineLayout.h"
|
|
#include "nsHTMLIIDs.h"
|
|
#include "nsIPresContext.h"
|
|
#include "nsHTMLAtoms.h"
|
|
#include "nsUnitConversion.h"
|
|
#include "nsIStyleContext.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "nsINameSpaceManager.h"
|
|
#include "nsIRenderingContext.h"
|
|
#include "nsIFontMetrics.h"
|
|
#include "nsStyleUtil.h"
|
|
|
|
#include "nsMathMLmunderoverFrame.h"
|
|
|
|
//
|
|
// <munderover> -- attach an underscript-overscript pair to a base - implementation
|
|
//
|
|
|
|
nsresult
|
|
NS_NewMathMLmunderoverFrame(nsIFrame** aNewFrame)
|
|
{
|
|
NS_PRECONDITION(aNewFrame, "null OUT ptr");
|
|
if (nsnull == aNewFrame) {
|
|
return NS_ERROR_NULL_POINTER;
|
|
}
|
|
nsMathMLmunderoverFrame* it = new nsMathMLmunderoverFrame;
|
|
if (nsnull == it) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
*aNewFrame = it;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsMathMLmunderoverFrame::nsMathMLmunderoverFrame()
|
|
{
|
|
}
|
|
|
|
nsMathMLmunderoverFrame::~nsMathMLmunderoverFrame()
|
|
{
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmunderoverFrame::Reflow(nsIPresContext& aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
nsReflowStatus childStatus;
|
|
nsHTMLReflowMetrics childDesiredSize(aDesiredSize.maxElementSize);
|
|
nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
|
|
|
|
aDesiredSize.width = 0;
|
|
|
|
//////////////////
|
|
// Reflow Children
|
|
|
|
nscoord count = 0;
|
|
nsRect rect[3];
|
|
nsIFrame* child[3];
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
while (nsnull != childFrame)
|
|
{
|
|
//////////////
|
|
// WHITESPACE: don't forget that whitespace doesn't count in MathML!
|
|
if (IsOnlyWhitespace(childFrame)) {
|
|
ReflowEmptyChild(childFrame);
|
|
}
|
|
else if (3 > count) {
|
|
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
|
|
childFrame, availSize);
|
|
rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
|
|
childReflowState, childStatus);
|
|
NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
|
|
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
|
|
child[count] = childFrame;
|
|
rect[count].width = childDesiredSize.width;
|
|
rect[count].height = childDesiredSize.height;
|
|
|
|
if (aDesiredSize.width < childDesiredSize.width) {
|
|
aDesiredSize.width = childDesiredSize.width;
|
|
}
|
|
if (0 == count) {
|
|
aDesiredSize.ascent = childDesiredSize.ascent;
|
|
aDesiredSize.descent = childDesiredSize.descent;
|
|
}
|
|
count++;
|
|
}
|
|
// else { invalid markup... }
|
|
|
|
rv = childFrame->GetNextSibling(&childFrame);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
|
|
}
|
|
|
|
//////////////////
|
|
// Place Children
|
|
|
|
aDesiredSize.ascent += rect[1].height;
|
|
aDesiredSize.descent += rect[2].height;
|
|
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
|
|
|
|
rect[0].x = (aDesiredSize.width - rect[0].width) / 2; // center w.r.t largest width
|
|
rect[1].x = (aDesiredSize.width - rect[1].width) / 2;
|
|
rect[2].x = (aDesiredSize.width - rect[2].width) / 2;
|
|
rect[0].y = rect[1].height;
|
|
rect[1].y = aDesiredSize.height - rect[1].height;
|
|
rect[2].y = 0;
|
|
|
|
//ignore the leading (line spacing) that is attached to the text
|
|
nscoord leading;
|
|
nsCOMPtr<nsIFontMetrics> fm;
|
|
const nsStyleFont* aFont =
|
|
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
|
|
aPresContext.GetMetricsFor(aFont->mFont, getter_AddRefs(fm));
|
|
fm->GetLeading(leading);
|
|
|
|
aDesiredSize.height -= 2*leading;
|
|
aDesiredSize.ascent -= leading;
|
|
aDesiredSize.descent -= leading;
|
|
rect[0].y -= leading;
|
|
rect[1].y -= 2*leading;
|
|
//
|
|
child[0]->SetRect(rect[0]);
|
|
child[1]->SetRect(rect[1]);
|
|
child[2]->SetRect(rect[2]);
|
|
|
|
if (nsnull != aDesiredSize.maxElementSize) {
|
|
aDesiredSize.maxElementSize->width = aDesiredSize.width;
|
|
aDesiredSize.maxElementSize->height = aDesiredSize.height;
|
|
}
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
return NS_OK;
|
|
}
|