michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsMathMLmspaceFrame.h"
michael@0: #include "nsMathMLElement.h"
michael@0: #include "mozilla/gfx/2D.h"
michael@0: #include <algorithm>
michael@0: 
michael@0: 
michael@0: //
michael@0: // <mspace> -- space - implementation
michael@0: //
michael@0: 
michael@0: nsIFrame*
michael@0: NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsMathMLmspaceFrame(aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
michael@0: 
michael@0: nsMathMLmspaceFrame::~nsMathMLmspaceFrame()
michael@0: {
michael@0: }
michael@0: 
michael@0: bool
michael@0: nsMathMLmspaceFrame::IsLeaf() const
michael@0: {
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsMathMLmspaceFrame::ProcessAttributes(nsPresContext* aPresContext)
michael@0: {
michael@0:   nsAutoString value;
michael@0: 
michael@0:   // width 
michael@0:   //
michael@0:   // "Specifies the desired width of the space."
michael@0:   //
michael@0:   // values: length
michael@0:   // default: 0em
michael@0:   //
michael@0:   // The default value is "0em", so unitless values can be ignored.
michael@0:   // <mspace/> is listed among MathML elements allowing negative spacing and
michael@0:   // the MathML test suite contains "Presentation/TokenElements/mspace/mspace2" 
michael@0:   // as an example. Hence we allow negative values.
michael@0:   //
michael@0:   mWidth = 0;
michael@0:   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::width, value);
michael@0:   if (!value.IsEmpty()) {
michael@0:     ParseNumericValue(value, &mWidth,
michael@0:                       nsMathMLElement::PARSE_ALLOW_NEGATIVE,
michael@0:                       aPresContext, mStyleContext);
michael@0:   }
michael@0: 
michael@0:   // height
michael@0:   //
michael@0:   // "Specifies the desired height (above the baseline) of the space."
michael@0:   //
michael@0:   // values: length
michael@0:   // default: 0ex
michael@0:   //
michael@0:   // The default value is "0ex", so unitless values can be ignored.
michael@0:   // We do not allow negative values. See bug 716349.
michael@0:   //
michael@0:   mHeight = 0;
michael@0:   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::height, value);
michael@0:   if (!value.IsEmpty()) {
michael@0:     ParseNumericValue(value, &mHeight, 0,
michael@0:                       aPresContext, mStyleContext);
michael@0:   }
michael@0: 
michael@0:   // depth
michael@0:   //
michael@0:   // "Specifies the desired depth (below the baseline) of the space."
michael@0:   //
michael@0:   // values: length
michael@0:   // default: 0ex
michael@0:   //
michael@0:   // The default value is "0ex", so unitless values can be ignored.
michael@0:   // We do not allow negative values. See bug 716349.
michael@0:   //
michael@0:   mDepth = 0;
michael@0:   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::depth_, value);
michael@0:   if (!value.IsEmpty()) {
michael@0:     ParseNumericValue(value, &mDepth, 0,
michael@0:                       aPresContext, mStyleContext);
michael@0:   }
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsMathMLmspaceFrame::Reflow(nsPresContext*          aPresContext,
michael@0:                             nsHTMLReflowMetrics&     aDesiredSize,
michael@0:                             const nsHTMLReflowState& aReflowState,
michael@0:                             nsReflowStatus&          aStatus)
michael@0: {
michael@0:   ProcessAttributes(aPresContext);
michael@0: 
michael@0:   mBoundingMetrics = nsBoundingMetrics();
michael@0:   mBoundingMetrics.width = mWidth;
michael@0:   mBoundingMetrics.ascent = mHeight;
michael@0:   mBoundingMetrics.descent = mDepth;
michael@0:   mBoundingMetrics.leftBearing = 0;
michael@0:   mBoundingMetrics.rightBearing = mBoundingMetrics.width;
michael@0: 
michael@0:   aDesiredSize.SetTopAscent(mHeight);
michael@0:   aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
michael@0:   aDesiredSize.Height() = aDesiredSize.TopAscent() + mDepth;
michael@0:   // Also return our bounding metrics
michael@0:   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
michael@0: 
michael@0:   aStatus = NS_FRAME_COMPLETE;
michael@0:   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: /* virtual */ nsresult
michael@0: nsMathMLmspaceFrame::MeasureForWidth(nsRenderingContext& aRenderingContext,
michael@0:                                      nsHTMLReflowMetrics& aDesiredSize)
michael@0: {
michael@0:   ProcessAttributes(PresContext());
michael@0:   mBoundingMetrics = nsBoundingMetrics();
michael@0:   mBoundingMetrics.width = mWidth;
michael@0:   aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
michael@0:   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
michael@0:   return NS_OK;
michael@0: }