ui/gfx/insets_f.h

// Copyright (c) 2012 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_INSETS_F_H_
#define UI_GFX_INSETS_F_H_

#include <string>

#include "build/build_config.h"
#include "ui/base/ui_export.h"

namespace gfx {

// A floating versino of gfx::Insets. This is copied, instead of using
// template, to avoid conflict with m19 branch.
// TODO(oshima): Merge this to ui/gfx/insets.h using template.
class UI_EXPORT InsetsF {
 public:
  InsetsF() : top_(0), left_(0), bottom_(0), right_(0) {}
  InsetsF(float top, float left, float bottom, float right)
      : top_(top),
        left_(left),
        bottom_(bottom),
        right_(right) {}
  ~InsetsF() {}

  float top() const { return top_; }
  float left() const { return left_; }
  float bottom() const { return bottom_; }
  float right() const { return right_; }

  // Returns the total width taken up by the insets, which is the sum of the
  // left and right insets.
  float width() const { return left_ + right_; }

  // Returns the total height taken up by the insets, which is the sum of the
  // top and bottom insets.
  float height() const { return top_ + bottom_; }

  // Returns true if the insets are empty.
  bool empty() const { return width() == 0 && height() == 0; }

  void Set(float top, float left, float bottom, float right) {
    top_ = top;
    left_ = left;
    bottom_ = bottom;
    right_ = right;
  }

  bool operator==(const InsetsF& insets) const {
    return top_ == insets.top_ && left_ == insets.left_ &&
           bottom_ == insets.bottom_ && right_ == insets.right_;
  }

  bool operator!=(const InsetsF& insets) const {
    return !(*this == insets);
  }

  InsetsF& operator+=(const InsetsF& insets) {
    top_ += insets.top_;
    left_ += insets.left_;
    bottom_ += insets.bottom_;
    right_ += insets.right_;
    return *this;
  }

  InsetsF operator-() const {
    return InsetsF(-top_, -left_, -bottom_, -right_);
  }

  // Returns a string representation of the insets.
  std::string ToString() const;

 private:
  float top_;
  float left_;
  float bottom_;
  float right_;
};

}  // namespace gfx

#endif  // UI_GFX_INSETS_F_H_