ui: Cleanup class/struct forward declarations

ui/views/controls/scrollbar/native_scroll_bar_views.cc

Index: ui/views/controls/scrollbar/native_scroll_bar_views.cc
diff --git a/ui/views/controls/scrollbar/native_scroll_bar_views.cc b/ui/views/controls/scrollbar/native_scroll_bar_views.cc
deleted file mode 100644
index 421a56da3f245b612cfde2f668584cd8911f7c78..0000000000000000000000000000000000000000
--- a/ui/views/controls/scrollbar/native_scroll_bar_views.cc
+++ /dev/null
@@ -1,406 +0,0 @@
-// 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.
-
-#include "ui/views/controls/scrollbar/native_scroll_bar_views.h"
-
-#include "base/logging.h"
-#include "ui/events/keycodes/keyboard_codes.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/path.h"
-#include "ui/views/controls/button/custom_button.h"
-#include "ui/views/controls/focusable_border.h"
-#include "ui/views/controls/scrollbar/base_scroll_bar_button.h"
-#include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
-#include "ui/views/controls/scrollbar/native_scroll_bar.h"
-#include "ui/views/controls/scrollbar/scroll_bar.h"
-
-namespace views {
-
-namespace {
-
-// Wrapper for the scroll buttons.
-class ScrollBarButton : public BaseScrollBarButton {
- public:
-  enum Type {
-    UP,
-    DOWN,
-    LEFT,
-    RIGHT,
-  };
-
-  ScrollBarButton(ButtonListener* listener, Type type);
-  ~ScrollBarButton() override;
-
-  gfx::Size GetPreferredSize() const override;
-  const char* GetClassName() const override { return "ScrollBarButton"; }
-
- protected:
-  void OnPaint(gfx::Canvas* canvas) override;
-
- private:
-  ui::NativeTheme::ExtraParams GetNativeThemeParams() const;
-  ui::NativeTheme::Part GetNativeThemePart() const;
-  ui::NativeTheme::State GetNativeThemeState() const;
-
-  Type type_;
-};
-
-// Wrapper for the scroll thumb
-class ScrollBarThumb : public BaseScrollBarThumb {
- public:
-  explicit ScrollBarThumb(BaseScrollBar* scroll_bar);
-  ~ScrollBarThumb() override;
-
-  gfx::Size GetPreferredSize() const override;
-  const char* GetClassName() const override { return "ScrollBarThumb"; }
-
- protected:
-  void OnPaint(gfx::Canvas* canvas) override;
-
- private:
-  ui::NativeTheme::ExtraParams GetNativeThemeParams() const;
-  ui::NativeTheme::Part GetNativeThemePart() const;
-  ui::NativeTheme::State GetNativeThemeState() const;
-
-  ScrollBar* scroll_bar_;
-};
-
-/////////////////////////////////////////////////////////////////////////////
-// ScrollBarButton
-
-ScrollBarButton::ScrollBarButton(ButtonListener* listener, Type type)
-    : BaseScrollBarButton(listener),
-      type_(type) {
-  SetFocusBehavior(FocusBehavior::NEVER);
-}
-
-ScrollBarButton::~ScrollBarButton() {
-}
-
-gfx::Size ScrollBarButton::GetPreferredSize() const {
-  return GetNativeTheme()->GetPartSize(GetNativeThemePart(),
-                                       GetNativeThemeState(),
-                                       GetNativeThemeParams());
-}
-
-void ScrollBarButton::OnPaint(gfx::Canvas* canvas) {
-  gfx::Rect bounds(GetPreferredSize());
-  GetNativeTheme()->Paint(canvas->sk_canvas(), GetNativeThemePart(),
-                          GetNativeThemeState(), bounds,
-                          GetNativeThemeParams());
-}
-
-ui::NativeTheme::ExtraParams
-    ScrollBarButton::GetNativeThemeParams() const {
-  ui::NativeTheme::ExtraParams params;
-
-  switch (state()) {
-    case CustomButton::STATE_HOVERED:
-      params.scrollbar_arrow.is_hovering = true;
-      break;
-    default:
-      params.scrollbar_arrow.is_hovering = false;
-      break;
-  }
-
-  return params;
-}
-
-ui::NativeTheme::Part
-    ScrollBarButton::GetNativeThemePart() const {
-  switch (type_) {
-    case UP:
-      return ui::NativeTheme::kScrollbarUpArrow;
-    case DOWN:
-      return ui::NativeTheme::kScrollbarDownArrow;
-    case LEFT:
-      return ui::NativeTheme::kScrollbarLeftArrow;
-    case RIGHT:
-      return ui::NativeTheme::kScrollbarRightArrow;
-  }
-
-  NOTREACHED();
-  return ui::NativeTheme::kScrollbarUpArrow;
-}
-
-ui::NativeTheme::State
-    ScrollBarButton::GetNativeThemeState() const {
-  switch (state()) {
-    case CustomButton::STATE_HOVERED:
-      return ui::NativeTheme::kHovered;
-    case CustomButton::STATE_PRESSED:
-      return ui::NativeTheme::kPressed;
-    case CustomButton::STATE_DISABLED:
-      return ui::NativeTheme::kDisabled;
-    case CustomButton::STATE_NORMAL:
-      return ui::NativeTheme::kNormal;
-    case CustomButton::STATE_COUNT:
-      break;
-  }
-
-  NOTREACHED();
-  return ui::NativeTheme::kNormal;
-}
-
-/////////////////////////////////////////////////////////////////////////////
-// ScrollBarThumb
-
-ScrollBarThumb::ScrollBarThumb(BaseScrollBar* scroll_bar)
-    : BaseScrollBarThumb(scroll_bar),
-      scroll_bar_(scroll_bar) {
-}
-
-ScrollBarThumb::~ScrollBarThumb() {
-}
-
-gfx::Size ScrollBarThumb::GetPreferredSize() const {
-  return GetNativeTheme()->GetPartSize(GetNativeThemePart(),
-                                       GetNativeThemeState(),
-                                       GetNativeThemeParams());
-}
-
-void ScrollBarThumb::OnPaint(gfx::Canvas* canvas) {
-  const gfx::Rect local_bounds(GetLocalBounds());
-  const ui::NativeTheme::State theme_state = GetNativeThemeState();
-  const ui::NativeTheme::ExtraParams extra_params(GetNativeThemeParams());
-  GetNativeTheme()->Paint(canvas->sk_canvas(),
-                          GetNativeThemePart(),
-                          theme_state,
-                          local_bounds,
-                          extra_params);
-  const ui::NativeTheme::Part gripper_part = scroll_bar_->IsHorizontal() ?
-      ui::NativeTheme::kScrollbarHorizontalGripper :
-      ui::NativeTheme::kScrollbarVerticalGripper;
-  GetNativeTheme()->Paint(canvas->sk_canvas(), gripper_part, theme_state,
-                          local_bounds, extra_params);
-}
-
-ui::NativeTheme::ExtraParams ScrollBarThumb::GetNativeThemeParams() const {
-  // This gives the behavior we want.
-  ui::NativeTheme::ExtraParams params;
-  params.scrollbar_thumb.is_hovering =
-      (GetState() != CustomButton::STATE_HOVERED);
-  return params;
-}
-
-ui::NativeTheme::Part ScrollBarThumb::GetNativeThemePart() const {
-  if (scroll_bar_->IsHorizontal())
-    return ui::NativeTheme::kScrollbarHorizontalThumb;
-  return ui::NativeTheme::kScrollbarVerticalThumb;
-}
-
-ui::NativeTheme::State ScrollBarThumb::GetNativeThemeState() const {
-  switch (GetState()) {
-    case CustomButton::STATE_HOVERED:
-      return ui::NativeTheme::kHovered;
-    case CustomButton::STATE_PRESSED:
-      return ui::NativeTheme::kPressed;
-    case CustomButton::STATE_DISABLED:
-      return ui::NativeTheme::kDisabled;
-    case CustomButton::STATE_NORMAL:
-      return ui::NativeTheme::kNormal;
-    case CustomButton::STATE_COUNT:
-      break;
-  }
-
-  NOTREACHED();
-  return ui::NativeTheme::kNormal;
-}
-
-}  // namespace
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeScrollBarViews, public:
-
-const char NativeScrollBarViews::kViewClassName[] = "NativeScrollBarViews";
-
-NativeScrollBarViews::NativeScrollBarViews(NativeScrollBar* scroll_bar)
-    : BaseScrollBar(scroll_bar->IsHorizontal(),
-                    new ScrollBarThumb(this)),
-      native_scroll_bar_(scroll_bar) {
-  set_controller(native_scroll_bar_->controller());
-
-  if (native_scroll_bar_->IsHorizontal()) {
-    prev_button_ = new ScrollBarButton(this, ScrollBarButton::LEFT);
-    next_button_ = new ScrollBarButton(this, ScrollBarButton::RIGHT);
-
-    part_ = ui::NativeTheme::kScrollbarHorizontalTrack;
-  } else {
-    prev_button_ = new ScrollBarButton(this, ScrollBarButton::UP);
-    next_button_ = new ScrollBarButton(this, ScrollBarButton::DOWN);
-
-    part_ = ui::NativeTheme::kScrollbarVerticalTrack;
-  }
-
-  state_ = ui::NativeTheme::kNormal;
-
-  AddChildView(prev_button_);
-  AddChildView(next_button_);
-
-  prev_button_->set_context_menu_controller(this);
-  next_button_->set_context_menu_controller(this);
-}
-
-NativeScrollBarViews::~NativeScrollBarViews() {
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeScrollBarViews, View overrides:
-
-void NativeScrollBarViews::Layout() {
-  gfx::Size size = prev_button_->GetPreferredSize();
-  prev_button_->SetBounds(0, 0, size.width(), size.height());
-
-  if (native_scroll_bar_->IsHorizontal()) {
-    next_button_->SetBounds(width() - size.width(), 0,
-                            size.width(), size.height());
-  } else {
-    next_button_->SetBounds(0, height() - size.height(),
-                            size.width(), size.height());
-  }
-
-  GetThumb()->SetBoundsRect(GetTrackBounds());
-}
-
-void NativeScrollBarViews::OnPaint(gfx::Canvas* canvas) {
-  gfx::Rect bounds = GetTrackBounds();
-
-  if (bounds.IsEmpty())
-    return;
-
-  params_.scrollbar_track.track_x = bounds.x();
-  params_.scrollbar_track.track_y = bounds.y();
-  params_.scrollbar_track.track_width = bounds.width();
-  params_.scrollbar_track.track_height = bounds.height();
-  params_.scrollbar_track.classic_state = 0;
-
-  GetNativeTheme()->Paint(canvas->sk_canvas(), part_, state_, bounds, params_);
-}
-
-gfx::Size NativeScrollBarViews::GetPreferredSize() const {
-  const ui::NativeTheme* theme = native_scroll_bar_->GetNativeTheme();
-  if (native_scroll_bar_->IsHorizontal())
-    return gfx::Size(0, GetHorizontalScrollBarHeight(theme));
-  return gfx::Size(GetVerticalScrollBarWidth(theme), 0);
-}
-
-const char* NativeScrollBarViews::GetClassName() const {
-  return kViewClassName;
-}
-
-int NativeScrollBarViews::GetLayoutSize() const {
-  gfx::Size size = prev_button_->GetPreferredSize();
-  return IsHorizontal() ? size.height() : size.width();
-}
-
-void NativeScrollBarViews::ScrollToPosition(int position) {
-  controller()->ScrollToPosition(native_scroll_bar_, position);
-}
-
-int NativeScrollBarViews::GetScrollIncrement(bool is_page, bool is_positive) {
-  return controller()->GetScrollIncrement(native_scroll_bar_,
-                                          is_page,
-                                          is_positive);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// BaseButton::ButtonListener overrides:
-
-void NativeScrollBarViews::ButtonPressed(Button* sender,
-                                         const ui::Event& event) {
-  if (sender == prev_button_) {
-    ScrollByAmount(SCROLL_PREV_LINE);
-  } else if (sender == next_button_) {
-    ScrollByAmount(SCROLL_NEXT_LINE);
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeScrollBarViews, NativeScrollBarWrapper overrides:
-
-int NativeScrollBarViews::GetPosition() const {
-  return BaseScrollBar::GetPosition();
-}
-
-View* NativeScrollBarViews::GetView() {
-  return this;
-}
-
-void NativeScrollBarViews::Update(int viewport_size,
-                                  int content_size,
-                                  int current_pos) {
-  BaseScrollBar::Update(viewport_size, content_size, current_pos);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativeScrollBarViews, private:
-
-gfx::Rect NativeScrollBarViews::GetTrackBounds() const {
-  gfx::Rect bounds = GetLocalBounds();
-  gfx::Size size = prev_button_->GetPreferredSize();
-  BaseScrollBarThumb* thumb = GetThumb();
-
-  if (native_scroll_bar_->IsHorizontal()) {
-    bounds.set_x(bounds.x() + size.width());
-    bounds.set_width(std::max(0, bounds.width() - 2 * size.width()));
-    bounds.set_height(thumb->GetPreferredSize().height());
-  } else {
-    bounds.set_y(bounds.y() + size.height());
-    bounds.set_height(std::max(0, bounds.height() - 2 * size.height()));
-    bounds.set_width(thumb->GetPreferredSize().width());
-  }
-
-  return bounds;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// NativewScrollBarWrapper, public:
-
-// static
-NativeScrollBarWrapper* NativeScrollBarWrapper::CreateWrapper(
-    NativeScrollBar* scroll_bar) {
-  return new NativeScrollBarViews(scroll_bar);
-}
-
-// static
-int NativeScrollBarWrapper::GetHorizontalScrollBarHeight(
-    const ui::NativeTheme* theme) {
-  ui::NativeTheme::ExtraParams button_params;
-  button_params.scrollbar_arrow.is_hovering = false;
-  gfx::Size button_size = theme->GetPartSize(
-      ui::NativeTheme::kScrollbarLeftArrow,
-      ui::NativeTheme::kNormal,
-      button_params);
-
-  ui::NativeTheme::ExtraParams thumb_params;
-  thumb_params.scrollbar_thumb.is_hovering = false;
-  gfx::Size track_size = theme->GetPartSize(
-      ui::NativeTheme::kScrollbarHorizontalThumb,
-      ui::NativeTheme::kNormal,
-      thumb_params);
-
-  return std::max(track_size.height(), button_size.height());
-}
-
-// static
-int NativeScrollBarWrapper::GetVerticalScrollBarWidth(
-    const ui::NativeTheme* theme) {
-  ui::NativeTheme::ExtraParams button_params;
-  button_params.scrollbar_arrow.is_hovering = false;
-  gfx::Size button_size = theme->GetPartSize(
-      ui::NativeTheme::kScrollbarUpArrow,
-      ui::NativeTheme::kNormal,
-      button_params);
-
-  ui::NativeTheme::ExtraParams thumb_params;
-  thumb_params.scrollbar_thumb.is_hovering = false;
-  gfx::Size track_size = theme->GetPartSize(
-      ui::NativeTheme::kScrollbarVerticalThumb,
-      ui::NativeTheme::kNormal,
-      thumb_params);
-
-  return std::max(track_size.width(), button_size.width());
-}
-
-}  // namespace views