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ash / public / cpp / rounded_image_view.h [blame]

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_PUBLIC_CPP_ROUNDED_IMAGE_VIEW_H_
#define ASH_PUBLIC_CPP_ROUNDED_IMAGE_VIEW_H_

#include "ash/public/cpp/ash_public_export.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/views/metadata/view_factory.h"
#include "ui/views/view.h"

namespace ash {

// A custom image view with rounded edges.
class ASH_PUBLIC_EXPORT RoundedImageView : public views::View {
  METADATA_HEADER(RoundedImageView, views::View)

 public:
  enum class Alignment {
    // The image's drawn portion always contains the image's origin.
    kLeading,

    // If the image's size is greater than the view's, only the portion around
    // the image's center shows.
    kCenter
  };

  RoundedImageView();
  RoundedImageView(int corner_radius, Alignment alignment);

  RoundedImageView(const RoundedImageView&) = delete;
  RoundedImageView& operator=(const RoundedImageView&) = delete;

  ~RoundedImageView() override;

  // Set the image that should be displayed. The image contents is copied to the
  // receiver's image.
  void SetImage(const gfx::ImageSkia& image);

  // Similar with the method above but the preferred image size is `size`.
  void SetImage(const gfx::ImageSkia& image, const gfx::Size& size);

  // Set the radii of the corners independently.
  void SetCornerRadii(int top_left,
                      int top_right,
                      int bottom_right,
                      int bottom_left);

  // Sets all radii of the corners collectively.
  void SetCornerRadius(int corner_radius);

  // views::View:
  gfx::Size CalculatePreferredSize(
      const views::SizeBounds& available_size) const override;
  void OnPaint(gfx::Canvas* canvas) override;

  const gfx::ImageSkia& original_image() const { return original_image_; }

 private:
  // Returns the preferred image size.
  gfx::Size GetImageSize() const;

  gfx::ImageSkia original_image_;
  gfx::ImageSkia resized_image_;
  int corner_radius_[4];

  const Alignment alignment_;
};

BEGIN_VIEW_BUILDER(ASH_PUBLIC_EXPORT, RoundedImageView, views::View)
VIEW_BUILDER_PROPERTY(int, CornerRadius)
END_VIEW_BUILDER

}  // namespace ash

DEFINE_VIEW_BUILDER(ASH_PUBLIC_EXPORT, ash::RoundedImageView)

#endif  // ASH_PUBLIC_CPP_ROUNDED_IMAGE_VIEW_H_