ash/shelf/scroll_arrow_view.cc

// Copyright 2019 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.

#include "ash/shelf/scroll_arrow_view.h"

#include "ash/resources/vector_icons/vector_icons.h"
#include "ash/shelf/shelf_constants.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/paint_vector_icon.h"
#include "ui/views/animation/flood_fill_ink_drop_ripple.h"
#include "ui/views/animation/ink_drop_impl.h"
#include "ui/views/animation/ink_drop_mask.h"
#include "ui/views/animation/ink_drop_painted_layer_delegates.h"

namespace ash {

ScrollArrowView::ScrollArrowView(ArrowType arrow_type,
                                 bool is_horizontal_alignment,
                                 views::ButtonListener* button_listener)
    : Button(button_listener),
      arrow_type_(arrow_type),
      is_horizontal_alignment_(is_horizontal_alignment) {
  SetFocusBehavior(FocusBehavior::ACCESSIBLE_ONLY);
  set_has_ink_drop_action_on_click(true);
  SetInkDropMode(InkDropMode::ON_NO_GESTURE_HANDLER);
}

ScrollArrowView::~ScrollArrowView() = default;

void ScrollArrowView::PaintButtonContents(gfx::Canvas* canvas) {
  const bool show_left_arrow = (arrow_type_ == kLeft && !base::i18n::IsRTL()) ||
                               (arrow_type_ == kRight && base::i18n::IsRTL());
  gfx::ImageSkia img = CreateVectorIcon(
      show_left_arrow ? kOverflowShelfLeftIcon : kOverflowShelfRightIcon,
      SK_ColorWHITE);

  if (!is_horizontal_alignment_) {
    img = gfx::ImageSkiaOperations::CreateRotatedImage(
        img, base::i18n::IsRTL() ? SkBitmapOperations::ROTATION_270_CW
                                 : SkBitmapOperations::ROTATION_90_CW);
  }

  gfx::PointF center_point(width() / 2.f, height() / 2.f);
  canvas->DrawImageInt(img, center_point.x() - img.width() / 2,
                       center_point.y() - img.height() / 2);
}

const char* ScrollArrowView::GetClassName() const {
  return "ScrollArrowView";
}

std::unique_ptr<views::InkDrop> ScrollArrowView::CreateInkDrop() {
  std::unique_ptr<views::InkDropImpl> ink_drop = CreateDefaultInkDropImpl();
  ink_drop->SetShowHighlightOnHover(false);
  return std::move(ink_drop);
}

std::unique_ptr<views::InkDropMask> ScrollArrowView::CreateInkDropMask() const {
  gfx::Point center_point = gfx::Rect(size()).CenterPoint();
  return std::make_unique<views::CircleInkDropMask>(size(), center_point,
                                                    width() / 2);
}

std::unique_ptr<views::InkDropRipple> ScrollArrowView::CreateInkDropRipple()
    const {
  gfx::Rect bounds = gfx::Rect(size());
  return std::make_unique<views::FloodFillInkDropRipple>(
      size(), GetLocalBounds().InsetsFrom(bounds),
      GetInkDropCenterBasedOnLastEvent(), kShelfInkDropBaseColor,
      kShelfInkDropVisibleOpacity);
}

}  // namespace ash