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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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
enum GridPositionType {
kAutoPosition,
kExplicitPosition, // [ <integer> || <string> ]
kSpanPosition, // span && [ <integer> || <string> ]
kNamedGridAreaPosition // <ident>
};
class GridPosition {
DISALLOW_NEW();
public:
GridPosition() : type_(kAutoPosition), integer_position_(0) {}
bool IsPositive() const { return IntegerPosition() > 0; }
GridPositionType GetType() const { return type_; }
bool IsAuto() const { return type_ == kAutoPosition; }
bool IsSpan() const { return type_ == kSpanPosition; }
bool IsNamedGridArea() const { return type_ == kNamedGridAreaPosition; }
void SetExplicitPosition(int position, const AtomicString& named_grid_line) {
type_ = kExplicitPosition;
integer_position_ = position;
named_grid_line_ = named_grid_line;
}
void SetAutoPosition() {
type_ = kAutoPosition;
integer_position_ = 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& named_grid_line) {
type_ = kSpanPosition;
integer_position_ = position;
named_grid_line_ = named_grid_line;
}
void SetNamedGridArea(const AtomicString& named_grid_area) {
type_ = kNamedGridAreaPosition;
named_grid_line_ = named_grid_area;
}
int IntegerPosition() const {
DCHECK_EQ(GetType(), kExplicitPosition);
return integer_position_;
}
AtomicString NamedGridLine() const {
DCHECK(GetType() == kExplicitPosition || GetType() == kSpanPosition ||
GetType() == kNamedGridAreaPosition);
return named_grid_line_;
}
int SpanPosition() const {
DCHECK_EQ(GetType(), kSpanPosition);
return integer_position_;
}
bool operator==(const GridPosition& other) const {
return type_ == other.type_ &&
integer_position_ == other.integer_position_ &&
named_grid_line_ == other.named_grid_line_;
}
bool operator!=(const GridPosition& other) const { return !(*this == other); }
bool ShouldBeResolvedAgainstOppositePosition() const {
return IsAuto() || IsSpan();
}
private:
GridPositionType type_;
int integer_position_;
AtomicString named_grid_line_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_