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/*
* Copyright (C) 2010 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2012 David Barton (dbarton@mathscribe.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RenderMathMLBlock_h
#define RenderMathMLBlock_h
#if ENABLE(MATHML)
#include "RenderFlexibleBox.h"
#include "RenderTable.h"
#include "StyleInheritedData.h"
#define ENABLE_DEBUG_MATH_LAYOUT 0
namespace WebCore {
class RenderMathMLOperator;
class RenderMathMLBlock : public RenderFlexibleBox {
public:
RenderMathMLBlock(Element* container);
virtual bool isChildAllowed(RenderObject*, RenderStyle*) const;
virtual bool isRenderMathMLBlock() const { return true; }
virtual bool isRenderMathMLOperator() const { return false; }
virtual bool isRenderMathMLRow() const { return false; }
virtual bool isRenderMathMLMath() const { return false; }
virtual bool isRenderMathMLFenced() const { return false; }
virtual bool isRenderMathMLFraction() const { return false; }
virtual bool isRenderMathMLRoot() const { return false; }
virtual bool isRenderMathMLSpace() const { return false; }
virtual bool isRenderMathMLSquareRoot() const { return false; }
virtual bool isRenderMathMLSubSup() const { return false; }
virtual bool isRenderMathMLUnderOver() const { return false; }
// MathML defines an "embellished operator" as roughly an <mo> that may have subscripts,
// superscripts, underscripts, overscripts, or a denominator (as in d/dx, where "d" is some
// differential operator). The padding, precedence, and stretchiness of the base <mo> should
// apply to the embellished operator as a whole. unembellishedOperator() checks for being an
// embellished operator, and omits any embellishments.
// FIXME: We don't yet handle all the cases in the MathML spec. See
// https://bugs.webkit.org/show_bug.cgi?id=78617.
virtual RenderMathMLOperator* unembellishedOperator() { return 0; }
// A MathML element's preferred logical widths often depend on its children's preferred heights, not just their widths.
// This is due to operator stretching and other layout fine tuning. We define an element's preferred height to be its
// actual height after layout inside a very wide parent.
bool isPreferredLogicalHeightDirty() const { return preferredLogicalWidthsDirty() || m_preferredLogicalHeight < 0; }
// The caller must ensure !isPreferredLogicalHeightDirty().
LayoutUnit preferredLogicalHeight() const { ASSERT(!isPreferredLogicalHeightDirty()); return m_preferredLogicalHeight; }
static const int preferredLogicalHeightUnset = -1;
void setPreferredLogicalHeight(LayoutUnit logicalHeight) { m_preferredLogicalHeight = logicalHeight; }
// computePreferredLogicalWidths() in derived classes must ensure m_preferredLogicalHeight is set to < 0 or its correct value.
virtual void computePreferredLogicalWidths() OVERRIDE;
virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE;
#if ENABLE(DEBUG_MATH_LAYOUT)
virtual void paint(PaintInfo&, const LayoutPoint&);
#endif
// Create a new RenderMathMLBlock, with a new style inheriting from this->style().
RenderMathMLBlock* createAnonymousMathMLBlock(EDisplay = FLEX);
void setIgnoreInAccessibilityTree(bool flag) { m_ignoreInAccessibilityTree = flag; }
bool ignoreInAccessibilityTree() const { return m_ignoreInAccessibilityTree; }
private:
virtual const char* renderName() const OVERRIDE;
bool m_ignoreInAccessibilityTree;
protected:
// Set our logical width to a large value, and compute our children's preferred logical heights.
void computeChildrenPreferredLogicalHeights();
// This can only be called after children have been sized by computeChildrenPreferredLogicalHeights().
static LayoutUnit preferredLogicalHeightAfterSizing(RenderObject* child);
// m_preferredLogicalHeight is dirty if it's < 0 or preferredLogicalWidthsDirty().
LayoutUnit m_preferredLogicalHeight;
};
inline RenderMathMLBlock* toRenderMathMLBlock(RenderObject* object)
{
ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderMathMLBlock());
return static_cast<RenderMathMLBlock*>(object);
}
inline const RenderMathMLBlock* toRenderMathMLBlock(const RenderObject* object)
{
ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderMathMLBlock());
return static_cast<const RenderMathMLBlock*>(object);
}
// This will catch anyone doing an unnecessary cast.
void toRenderMathMLBlock(const RenderMathMLBlock*);
class RenderMathMLTable : public RenderTable {
public:
explicit RenderMathMLTable(Element* element) : RenderTable(element) { }
virtual int firstLineBoxBaseline() const OVERRIDE;
private:
virtual const char* renderName() const OVERRIDE { return "RenderMathMLTable"; }
};
// Parsing functions for MathML Length values
bool parseMathMLLength(const String&, LayoutUnit&, const RenderStyle*, bool allowNegative = true);
bool parseMathMLNamedSpace(const String&, LayoutUnit&, const RenderStyle*, bool allowNegative = true);
}
#endif // ENABLE(MATHML)
#endif // RenderMathMLBlock_h
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