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// Copyright 2022 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_GEOMETRY_INSETS_OUTSETS_F_BASE_H_
#define UI_GFX_GEOMETRY_INSETS_OUTSETS_F_BASE_H_
#include <string>
#include "base/strings/stringprintf.h"
namespace gfx {
// This is the base template class of InsetsF and OutsetsF.
template <typename T>
class InsetsOutsetsFBase {
public:
constexpr InsetsOutsetsFBase() = default;
constexpr explicit InsetsOutsetsFBase(float all)
: top_(all), left_(all), bottom_(all), right_(all) {}
constexpr float top() const { return top_; }
constexpr float left() const { return left_; }
constexpr float bottom() const { return bottom_; }
constexpr float right() const { return right_; }
// Returns the total width taken up by the insets/outsets, which is the
// sum of the left and right insets/outsets.
constexpr float width() const { return left_ + right_; }
// Returns the total height taken up by the insets/outsets, which is the
// sum of the top and bottom insets/outsets.
constexpr float height() const { return top_ + bottom_; }
// Returns true if the insets/outsets are empty.
bool IsEmpty() const { return width() == 0.f && height() == 0.f; }
// These setters can be used together with the default constructor and the
// single-parameter constructor to construct InsetsF instances, for example:
// // T, L, B, R
// InsetsF a = InsetsF().set_top(2); // 2, 0, 0, 0
// InsetsF b = InsetsF().set_left(2).set_bottom(3); // 0, 2, 3, 0
// InsetsF c = InsetsF(1).set_top(5); // 5, 1, 1, 1
constexpr T& set_top(float top) {
top_ = top;
return *static_cast<T*>(this);
}
constexpr T& set_left(float left) {
left_ = left;
return *static_cast<T*>(this);
}
constexpr T& set_bottom(float bottom) {
bottom_ = bottom;
return *static_cast<T*>(this);
}
constexpr T& set_right(float right) {
right_ = right;
return *static_cast<T*>(this);
}
// In addition to the above, we can also use the following methods to
// construct InsetsF/OutsetsF.
// TLBR() is for Chomium UI code. We should not use it in blink code because
// the order of parameters is different from the normal orders used in blink.
// Blink code can use the above setters and VH().
static constexpr inline T TLBR(float top,
float left,
float bottom,
float right) {
return T().set_top(top).set_left(left).set_bottom(bottom).set_right(right);
}
static constexpr inline T VH(float vertical, float horizontal) {
return TLBR(vertical, horizontal, vertical, horizontal);
}
// Sets each side to the maximum of the side and the corresponding side of
// |other|.
void SetToMax(const T& other) {
top_ = std::max(top_, other.top_);
left_ = std::max(left_, other.left_);
bottom_ = std::max(bottom_, other.bottom_);
right_ = std::max(right_, other.right_);
}
void Scale(float x_scale, float y_scale) {
top_ *= y_scale;
left_ *= x_scale;
bottom_ *= y_scale;
right_ *= x_scale;
}
void Scale(float scale) { Scale(scale, scale); }
bool operator==(const T& other) const {
return top_ == other.top_ && left_ == other.left_ &&
bottom_ == other.bottom_ && right_ == other.right_;
}
bool operator!=(const T& other) const { return !(*this == other); }
void operator+=(const T& other) {
top_ += other.top_;
left_ += other.left_;
bottom_ += other.bottom_;
right_ += other.right_;
}
void operator-=(const T& other) {
top_ -= other.top_;
left_ -= other.left_;
bottom_ -= other.bottom_;
right_ -= other.right_;
}
T operator-() const {
return T().set_left(-left_).set_right(-right_).set_top(-top_).set_bottom(
-bottom_);
}
// Returns a string representation of the insets/outsets.
std::string ToString() const {
return base::StringPrintf("x:%g,%g y:%g,%g", left_, right_, top_, bottom_);
}
private:
float top_ = 0.f;
float left_ = 0.f;
float bottom_ = 0.f;
float right_ = 0.f;
};
} // namespace gfx
#endif // UI_GFX_GEOMETRY_INSETS_OUTSETS_F_BASE_H_
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