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131 lines
3.8 KiB
131 lines
3.8 KiB
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef UI_GFX_GEOMETRY_INSETS_H_
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#define UI_GFX_GEOMETRY_INSETS_H_
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#include <string>
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#include "ui/gfx/geometry/insets_f.h"
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#include "ui/gfx/gfx_export.h"
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namespace gfx {
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class Vector2d;
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// Represents the widths of the four borders or margins of an unspecified
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// rectangle. An Insets stores the thickness of the top, left, bottom and right
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// edges, without storing the actual size and position of the rectangle itself.
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//
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// This can be used to represent a space within a rectangle, by "shrinking" the
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// rectangle by the inset amount on all four sides. Alternatively, it can
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// represent a border that has a different thickness on each side.
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class GFX_EXPORT Insets {
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public:
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constexpr Insets() : top_(0), left_(0), bottom_(0), right_(0) {}
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constexpr explicit Insets(int all)
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: top_(all), left_(all), bottom_(all), right_(all) {}
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constexpr Insets(int vertical, int horizontal)
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: top_(vertical),
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left_(horizontal),
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bottom_(vertical),
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right_(horizontal) {}
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constexpr Insets(int top, int left, int bottom, int right)
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: top_(top), left_(left), bottom_(bottom), right_(right) {}
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constexpr int top() const { return top_; }
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constexpr int left() const { return left_; }
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constexpr int bottom() const { return bottom_; }
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constexpr int right() const { return right_; }
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// Returns the total width taken up by the insets, which is the sum of the
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// left and right insets.
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constexpr int width() const { return left_ + right_; }
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// Returns the total height taken up by the insets, which is the sum of the
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// top and bottom insets.
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constexpr int height() const { return top_ + bottom_; }
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// Returns true if the insets are empty.
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bool IsEmpty() const { return width() == 0 && height() == 0; }
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void Set(int top, int left, int bottom, int right) {
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top_ = top;
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left_ = left;
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bottom_ = bottom;
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right_ = right;
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}
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bool operator==(const Insets& insets) const {
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return top_ == insets.top_ && left_ == insets.left_ &&
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bottom_ == insets.bottom_ && right_ == insets.right_;
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}
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bool operator!=(const Insets& insets) const {
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return !(*this == insets);
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}
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void operator+=(const Insets& insets) {
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top_ += insets.top_;
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left_ += insets.left_;
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bottom_ += insets.bottom_;
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right_ += insets.right_;
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}
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void operator-=(const Insets& insets) {
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top_ -= insets.top_;
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left_ -= insets.left_;
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bottom_ -= insets.bottom_;
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right_ -= insets.right_;
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}
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Insets operator-() const {
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return Insets(-top_, -left_, -bottom_, -right_);
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}
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Insets Scale(float scale) const {
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return Scale(scale, scale);
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}
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Insets Scale(float x_scale, float y_scale) const {
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return Insets(static_cast<int>(top() * y_scale),
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static_cast<int>(left() * x_scale),
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static_cast<int>(bottom() * y_scale),
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static_cast<int>(right() * x_scale));
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}
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// Adjusts the vertical and horizontal dimensions by the values described in
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// |vector|. Offsetting insets before applying to a rectangle would be
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// equivalent to offseting the rectangle then applying the insets.
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Insets Offset(const gfx::Vector2d& vector) const;
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operator InsetsF() const {
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return InsetsF(static_cast<float>(top()), static_cast<float>(left()),
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static_cast<float>(bottom()), static_cast<float>(right()));
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}
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// Returns a string representation of the insets.
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std::string ToString() const;
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private:
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int top_;
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int left_;
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int bottom_;
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int right_;
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};
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inline Insets operator+(Insets lhs, const Insets& rhs) {
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lhs += rhs;
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return lhs;
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}
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inline Insets operator-(Insets lhs, const Insets& rhs) {
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lhs -= rhs;
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return lhs;
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}
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} // namespace gfx
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#endif // UI_GFX_GEOMETRY_INSETS_H_
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