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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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 GridPosition_h
#define GridPosition_h
#include "wtf/Allocator.h"
#include "wtf/text/WTFString.h"
namespace blink {
enum GridPositionType {
AutoPosition,
ExplicitPosition, // [ <integer> || <string> ]
SpanPosition, // span && [ <integer> || <string> ]
NamedGridAreaPosition // <ident>
};
class GridPosition {
DISALLOW_NEW();
public:
GridPosition() : m_type(AutoPosition), m_integerPosition(0) {}
bool isPositive() const { return integerPosition() > 0; }
GridPositionType type() const { return m_type; }
bool isAuto() const { return m_type == AutoPosition; }
bool isSpan() const { return m_type == SpanPosition; }
bool isNamedGridArea() const { return m_type == NamedGridAreaPosition; }
void setExplicitPosition(int position, const AtomicString& namedGridLine) {
m_type = ExplicitPosition;
m_integerPosition = position;
m_namedGridLine = namedGridLine;
}
void setAutoPosition() {
m_type = AutoPosition;
m_integerPosition = 0;
}
// 'span' values cannot be negative, yet we reuse the <integer> position which
// can be. This means that we have to convert the span position to an integer,
// losing some precision here. It shouldn't be an issue in practice though.
void setSpanPosition(int position, const AtomicString& namedGridLine) {
m_type = SpanPosition;
m_integerPosition = position;
m_namedGridLine = namedGridLine;
}
void setNamedGridArea(const AtomicString& namedGridArea) {
m_type = NamedGridAreaPosition;
m_namedGridLine = namedGridArea;
}
int integerPosition() const {
ASSERT(type() == ExplicitPosition);
return m_integerPosition;
}
AtomicString namedGridLine() const {
ASSERT(type() == ExplicitPosition || type() == SpanPosition ||
type() == NamedGridAreaPosition);
return m_namedGridLine;
}
int spanPosition() const {
ASSERT(type() == SpanPosition);
return m_integerPosition;
}
bool operator==(const GridPosition& other) const {
return m_type == other.m_type &&
m_integerPosition == other.m_integerPosition &&
m_namedGridLine == other.m_namedGridLine;
}
bool shouldBeResolvedAgainstOppositePosition() const {
return isAuto() || isSpan();
}
private:
GridPositionType m_type;
int m_integerPosition;
AtomicString m_namedGridLine;
};
} // namespace blink
#endif // GridPosition_h
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