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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_RANGE_RANGE_F_H_
#define UI_GFX_RANGE_RANGE_F_H_
#include <ostream>
#include <string>
#include "ui/gfx/gfx_export.h"
#include "ui/gfx/range/range.h"
namespace gfx {
// A float version of Range. RangeF is made of a start and end position; when
// they are the same, the range is empty. Note that |start_| can be greater
// than |end_| to respect the directionality of the range.
class GFX_EXPORT RangeF {
public:
// Creates an empty range {0,0}.
RangeF();
// Initializes the range with a start and end.
RangeF(float start, float end);
// Initializes the range with the same start and end positions.
explicit RangeF(float position);
// Returns a range that is invalid, which is {float_max,float_max}.
static const RangeF InvalidRange();
// Checks if the range is valid through comparison to InvalidRange().
bool IsValid() const;
// Getters and setters.
float start() const { return start_; }
void set_start(float start) { start_ = start; }
float end() const { return end_; }
void set_end(float end) { end_ = end; }
// Returns the absolute value of the length.
float length() const {
const float length = end() - start();
return length >= 0 ? length : -length;
}
bool is_reversed() const { return start() > end(); }
bool is_empty() const { return start() == end(); }
// Returns the minimum and maximum values.
float GetMin() const;
float GetMax() const;
bool operator==(const RangeF& other) const;
bool operator!=(const RangeF& other) const;
bool EqualsIgnoringDirection(const RangeF& other) const;
// Returns true if this range intersects the specified |range|.
bool Intersects(const RangeF& range) const;
// Returns true if this range contains the specified |range|.
bool Contains(const RangeF& range) const;
// Computes the intersection of this range with the given |range|.
// If they don't intersect, it returns an InvalidRange().
// The returned range is always empty or forward (never reversed).
RangeF Intersect(const RangeF& range) const;
RangeF Intersect(const Range& range) const;
// Floor/Ceil/Round the start and end values of the given RangeF.
Range Floor() const;
Range Ceil() const;
Range Round() const;
std::string ToString() const;
private:
float start_;
float end_;
};
GFX_EXPORT std::ostream& operator<<(std::ostream& os, const RangeF& range);
} // namespace gfx
#endif // UI_GFX_RANGE_RANGE_F_H_
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