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layout/mathml/nsMathMLmspaceFrame.cpp@b8a032363ba2 (annotated)

layout/mathml/nsMathMLmspaceFrame.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	#include "nsMathMLmspaceFrame.h"
michael@0	7	#include "nsMathMLElement.h"
michael@0	8	#include "mozilla/gfx/2D.h"
michael@0	9	#include <algorithm>
michael@0	10
michael@0	11
michael@0	12	//
michael@0	13	// <mspace> -- space - implementation
michael@0	14	//
michael@0	15
michael@0	16	nsIFrame*
michael@0	17	NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0	18	{
michael@0	19	return new (aPresShell) nsMathMLmspaceFrame(aContext);
michael@0	20	}
michael@0	21
michael@0	22	NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
michael@0	23
michael@0	24	nsMathMLmspaceFrame::~nsMathMLmspaceFrame()
michael@0	25	{
michael@0	26	}
michael@0	27
michael@0	28	bool
michael@0	29	nsMathMLmspaceFrame::IsLeaf() const
michael@0	30	{
michael@0	31	return true;
michael@0	32	}
michael@0	33
michael@0	34	void
michael@0	35	nsMathMLmspaceFrame::ProcessAttributes(nsPresContext* aPresContext)
michael@0	36	{
michael@0	37	nsAutoString value;
michael@0	38
michael@0	39	// width
michael@0	40	//
michael@0	41	// "Specifies the desired width of the space."
michael@0	42	//
michael@0	43	// values: length
michael@0	44	// default: 0em
michael@0	45	//
michael@0	46	// The default value is "0em", so unitless values can be ignored.
michael@0	47	// <mspace/> is listed among MathML elements allowing negative spacing and
michael@0	48	// the MathML test suite contains "Presentation/TokenElements/mspace/mspace2"
michael@0	49	// as an example. Hence we allow negative values.
michael@0	50	//
michael@0	51	mWidth = 0;
michael@0	52	mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::width, value);
michael@0	53	if (!value.IsEmpty()) {
michael@0	54	ParseNumericValue(value, &mWidth,
michael@0	55	nsMathMLElement::PARSE_ALLOW_NEGATIVE,
michael@0	56	aPresContext, mStyleContext);
michael@0	57	}
michael@0	58
michael@0	59	// height
michael@0	60	//
michael@0	61	// "Specifies the desired height (above the baseline) of the space."
michael@0	62	//
michael@0	63	// values: length
michael@0	64	// default: 0ex
michael@0	65	//
michael@0	66	// The default value is "0ex", so unitless values can be ignored.
michael@0	67	// We do not allow negative values. See bug 716349.
michael@0	68	//
michael@0	69	mHeight = 0;
michael@0	70	mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::height, value);
michael@0	71	if (!value.IsEmpty()) {
michael@0	72	ParseNumericValue(value, &mHeight, 0,
michael@0	73	aPresContext, mStyleContext);
michael@0	74	}
michael@0	75
michael@0	76	// depth
michael@0	77	//
michael@0	78	// "Specifies the desired depth (below the baseline) of the space."
michael@0	79	//
michael@0	80	// values: length
michael@0	81	// default: 0ex
michael@0	82	//
michael@0	83	// The default value is "0ex", so unitless values can be ignored.
michael@0	84	// We do not allow negative values. See bug 716349.
michael@0	85	//
michael@0	86	mDepth = 0;
michael@0	87	mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::depth_, value);
michael@0	88	if (!value.IsEmpty()) {
michael@0	89	ParseNumericValue(value, &mDepth, 0,
michael@0	90	aPresContext, mStyleContext);
michael@0	91	}
michael@0	92	}
michael@0	93
michael@0	94	nsresult
michael@0	95	nsMathMLmspaceFrame::Reflow(nsPresContext* aPresContext,
michael@0	96	nsHTMLReflowMetrics& aDesiredSize,
michael@0	97	const nsHTMLReflowState& aReflowState,
michael@0	98	nsReflowStatus& aStatus)
michael@0	99	{
michael@0	100	ProcessAttributes(aPresContext);
michael@0	101
michael@0	102	mBoundingMetrics = nsBoundingMetrics();
michael@0	103	mBoundingMetrics.width = mWidth;
michael@0	104	mBoundingMetrics.ascent = mHeight;
michael@0	105	mBoundingMetrics.descent = mDepth;
michael@0	106	mBoundingMetrics.leftBearing = 0;
michael@0	107	mBoundingMetrics.rightBearing = mBoundingMetrics.width;
michael@0	108
michael@0	109	aDesiredSize.SetTopAscent(mHeight);
michael@0	110	aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
michael@0	111	aDesiredSize.Height() = aDesiredSize.TopAscent() + mDepth;
michael@0	112	// Also return our bounding metrics
michael@0	113	aDesiredSize.mBoundingMetrics = mBoundingMetrics;
michael@0	114
michael@0	115	aStatus = NS_FRAME_COMPLETE;
michael@0	116	NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
michael@0	117	return NS_OK;
michael@0	118	}
michael@0	119
michael@0	120	/* virtual */ nsresult
michael@0	121	nsMathMLmspaceFrame::MeasureForWidth(nsRenderingContext& aRenderingContext,
michael@0	122	nsHTMLReflowMetrics& aDesiredSize)
michael@0	123	{
michael@0	124	ProcessAttributes(PresContext());
michael@0	125	mBoundingMetrics = nsBoundingMetrics();
michael@0	126	mBoundingMetrics.width = mWidth;
michael@0	127	aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
michael@0	128	aDesiredSize.mBoundingMetrics = mBoundingMetrics;
michael@0	129	return NS_OK;
michael@0	130	}