ui/views/window/nav_button_provider.h

// Copyright 2017 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_VIEWS_NAV_BUTTON_PROVIDER_H_
#define UI_VIEWS_NAV_BUTTON_PROVIDER_H_

#include "ui/views/controls/button/button.h"

namespace chrome {
enum class FrameButtonDisplayType;
}

namespace gfx {
class ImageSkia;
class Insets;
}  // namespace gfx

namespace views {

class NavButtonProvider {
 public:
  virtual ~NavButtonProvider() {}

  // If |top_area_height| is different from the cached top area
  // height, redraws all button images at the new size.
  virtual void RedrawImages(int top_area_height, bool maximized) = 0;

  // Gets the cached button image corresponding to |type| and |state|.
  virtual gfx::ImageSkia GetImage(chrome::FrameButtonDisplayType type,
                                  views::Button::ButtonState state) const = 0;

  // Gets the external margin around each button.  The left inset
  // represents the leading margin, and the right inset represents the
  // trailing margin.
  virtual gfx::Insets GetNavButtonMargin(
      chrome::FrameButtonDisplayType type) const = 0;

  // Gets the internal spacing (padding + border) of the top area.
  // The left inset represents the leading spacing, and the right
  // inset represents the trailing spacing.
  virtual gfx::Insets GetTopAreaSpacing() const = 0;

  // Gets the spacing to be used to separate buttons.
  virtual int GetInterNavButtonSpacing() const = 0;
};

}  // namespace views

#endif  // UI_VIEWS_NAV_BUTTON_PROVIDER_H_