Vertical Tabs

// From patches/helium/ui/layout/vertical.patch

// Collapsed width: 38px (very compact)
static constexpr int kCollapsedWidth = 38;

// Uncollapsed minimum: 160px
static constexpr int kUncollapsedMinWidth = 160;

// Uncollapsed maximum: 400px
static constexpr int kUncollapsedMaxWidth = 400;

// Default width: 200px (optimal for most screens)
inline constexpr int kVerticalTabStripDefaultUncollapsedWidth = 200;

void VerticalTabStripRegionView::OnResize(int resize_amount, bool done_resizing) {
  const int resize_delta = state_controller_->IsTabStripRightAligned()
                              ? -resize_amount
                              : resize_amount;
  const int proposed_width = starting_width_on_resize_.value() + resize_delta;
}

// Snap to default width if within 6px
const int default_uncollapsed_width =
    tabs::kVerticalTabStripDefaultUncollapsedWidth;  // 200px
const int min_snap_width = default_uncollapsed_width - kDefaultWidthSnapDistance;  // 194px
const int max_snap_width = default_uncollapsed_width + kDefaultWidthSnapDistance;  // 206px

if (new_state.uncollapsed_width >= min_snap_width &&
    new_state.uncollapsed_width <= max_snap_width) {
  new_state.uncollapsed_width = default_uncollapsed_width;  // Snap to 200px!
}

case LayoutConstant::kVerticalTabMinWidth:
-  return 32;
+  return 30;  // 2px narrower

case LayoutConstant::kVerticalTabStripUncollapsedPadding:
-  return 12;
+  return 6;  // Half the padding

case LayoutConstant::kVerticalTabStripCollapsedPadding:
-  return 8;
+  return 4;  // Half the padding

resize_animation_.SetSlideDuration(
-  gfx::Animation::RichAnimationDuration(base::Milliseconds(450)));
+  gfx::Animation::RichAnimationDuration(base::Milliseconds(250)));

resize_animation_.SetTweenType(gfx::Tween::Type::EASE_IN_OUT_EMPHASIZED);

const int vertical_tab_strip_x =
    vertical_right_aligned
        ? params.visual_client_area.right() - vertical_tab_strip_width
        : params.visual_client_area.x();

case LayoutConstant::kVerticalTabHeight:
  return 30;  // 30px tall

std::vector<TabChildConfig>{
    TabChildConfig(close_button_, kIconDesignWidth, kDefaultPadding,
                   /*align_leading=*/false, /*expand=*/false),
    TabChildConfig(icon_, kIconDesignWidth, kHorizontalInset,
                   /*align_leading=*/true, /*expand=*/false),
    TabChildConfig(alert_indicator_, kIconDesignWidth, kDefaultPadding,
                   /*align_leading=*/true, /*expand=*/false),
    TabChildConfig(title_, kTitleMinWidth, kDefaultPadding,
                   /*align_leading=*/true, /*expand=*/true)
};

void VerticalTabView::UpdateCloseButtonVisibility() {
  // Show close button only when:
  // 1) The tab is wide enough and active OR hovered, or
  // 2) The tab is small and active AND hovered.
  
  const bool title_visible = title_->GetVisible() && title_->width() > 0;
  const bool show_close_button = !pinned_ &&
      (title_visible ? (active_ || hovered_) : (active_ && hovered_));
  close_button_->SetVisible(show_close_button);
}

const bool should_hide_icon_for_alert = pinned_ || is_collapsed;
icon_->SetVisible(!alert_indicator_visible || !should_hide_icon_for_alert);

// Buttons in collapsed mode: vertical stack
// Buttons in expanded mode: horizontal row

collapse_button_ = AddChildButtonFor(kActionToggleCollapseVertical);
collapse_button_->SetProperty(views::kElementIdentifierKey,
                              kVerticalTabStripCollapseButtonElementId);

// Collapsed: square buttons stacked vertically
const int button_size = pref_size.height();
gfx::Rect bounds((host_size.width() - button_size) / 2, current_y,
                 button_size, button_size);

// Expanded: buttons in horizontal row
const int button_size = pref_size.height();
gfx::Rect bounds(
    is_right_aligned ? current_x - button_size : current_x,
    host_size.height() - (kContainerHeight + button_size) / 2,
    button_size, button_size);

new_tab_button_ = AddChildButtonFor(kActionNewTab, IDS_ACCNAME_NEWTAB);
new_tab_button_->SetProperty(views::kElementIdentifierKey,
                             kNewTabButtonElementId);

- tab_group_button_ = AddChildButtonFor(kActionTabGroupsMenu);
- new_tab_button_ = AddChildButtonFor(kActionNewTab);
+ new_tab_button_ = AddChildButtonFor(kActionNewTab);  // Only new tab button

new_tab_button_->SetText(l10n_util::GetStringUTF16(string_id));
new_tab_button_->SetEnabledTextColors(kColorToolbarButtonIconDisabled);
new_tab_button_->SetBorder(views::CreateEmptyBorder(
    gfx::Insets::VH(kBasePadding, kBasePadding * 2)));
new_tab_button_->SetImageLabelSpacing(kBasePadding * 2);
new_tab_button_->SetHorizontalAlignment(gfx::HorizontalAlignment::ALIGN_LEFT);

const int collapsed_vertical_tab_strip_adjustment = GetCollapsedVerticalTabStripTopAdjustment(params);

if (collapsed_vertical_tab_strip_adjustment > 0) {
  if (vertical_right_aligned) {
    top_container_layout.bounds.Outset(gfx::Outsets::TLBR(
        0, 0, 0, collapsed_vertical_tab_strip_adjustment));
  } else {
    top_container_layout.bounds.Outset(gfx::Outsets::TLBR(
        0, collapsed_vertical_tab_strip_adjustment, 0, 0));
  }
}

const int corner_radius =
    show_corner_fill
        ? GetLayoutConstant(LayoutConstant::kVerticalTabCornerRadius)
        : 0;
leading_corner_fill_view_->SetCornerRadius(corner_radius);

// patches/upstream-fixes/vertical/r1576368-add-scrollview-api.patch
// Adds scroll view API for smooth scrolling

// patches/upstream-fixes/vertical/r1576442-scroll-to-activated-tabs.patch
// Auto-scrolls to show activated tabs

r1571978-support-dragging-multiple-vertical-tabs.patch
r1572660-correctly-position-dragged-split-views.patch
r1574955-handle-dragging-pinned-vertical-tabs.patch
r1579572-support-dragging-fully-selected-tab-groups.patch

// Pinned tabs are laid out contiguously
// patches/upstream-fixes/vertical/r1577564-layout-pinned-tabs-contiguously-with-dragged-placeholder.patch

// patches/upstream-fixes/vertical/r1577348-support-dragging-tabgroup-headers.patch
// Enables dragging tab group headers to reorder groups

// patches/upstream-fixes/vertical/r1573324-lazily-load-tabstrips-when-switching-modes.patch
// Only renders visible tab strip (horizontal OR vertical, not both)

// patches/upstream-fixes/vertical/r1578138-custom-scrollbars.patch
// Themed scrollbars that match the browser UI

// Proper ARIA labels for all interactive elements
new_tab_button_->SetText(l10n_util::GetStringUTF16(IDS_ACCNAME_NEWTAB));
collapse_button_->SetProperty(views::kElementIdentifierKey,
                              kVerticalTabStripCollapseButtonElementId);