ash / wm / splitview / split_view_drag_indicators.cc [blame]

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ash/wm/splitview/split_view_drag_indicators.h"

#include <utility>

#include "ash/display/screen_orientation_controller.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/public/cpp/window_animation_types.h"
#include "ash/root_window_controller.h"
#include "ash/screen_util.h"
#include "ash/shelf/shelf.h"
#include "ash/shell.h"
#include "ash/strings/grit/ash_strings.h"
#include "ash/wm/overview/overview_controller.h"
#include "ash/wm/overview/overview_session.h"
#include "ash/wm/overview/overview_window_drag_controller.h"
#include "ash/wm/splitview/split_view_constants.h"
#include "ash/wm/splitview/split_view_controller.h"
#include "ash/wm/splitview/split_view_highlight_view.h"
#include "ash/wm/splitview/split_view_overview_session.h"
#include "ash/wm/splitview/split_view_types.h"
#include "ash/wm/splitview/split_view_utils.h"
#include "ash/wm/window_animations.h"
#include "ash/wm/window_util.h"
#include "base/i18n/rtl.h"
#include "base/strings/utf_string_conversions.h"
#include "chromeos/ui/frame/caption_buttons/snap_controller.h"
#include "chromeos/utils/haptics_util.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/chromeos/styles/cros_tokens_color_mappings.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_type.h"
#include "ui/events/devices/haptic_touchpad_effects.h"
#include "ui/views/background.h"
#include "ui/views/controls/label.h"
#include "ui/views/highlight_border.h"
#include "ui/views/layout/box_layout_view.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/core/coordinate_conversion.h"
#include "ui/wm/core/window_animations.h"

namespace ash {

namespace {

// When a preview is shown, the opposite highlight shall contract to this ratio
// of the screen length.
constexpr float kOtherHighlightScreenPrimaryAxisRatio = 0.03f;

// Creates the widget responsible for displaying the indicators.
std::unique_ptr<views::Widget> CreateWidget(aura::Window* root_window) {
  auto widget = std::make_unique<views::Widget>();
  views::Widget::InitParams params(
      views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET,
      views::Widget::InitParams::TYPE_POPUP);
  params.opacity = views::Widget::InitParams::WindowOpacity::kTranslucent;
  params.accept_events = false;
  params.layer_type = ui::LAYER_NOT_DRAWN;
  params.parent =
      Shell::GetContainer(root_window, kShellWindowId_OverlayContainer);
  widget->set_focus_on_creation(false);
  widget->Init(std::move(params));
  return widget;
}

// Computes the transform which rotates the labels |angle| degrees. The point
// of rotation is the relative center point of |bounds|.
gfx::Transform ComputeRotateAroundCenterTransform(const gfx::Rect& bounds,
                                                  double angle) {
  gfx::Transform transform;
  const gfx::Vector2dF center_point_vector =
      bounds.CenterPoint() - bounds.origin();
  transform.Translate(center_point_vector);
  transform.Rotate(angle);
  transform.Translate(-center_point_vector);
  return transform;
}

// Returns the work area bounds that has no overlap with shelf.
gfx::Rect GetWorkAreaBoundsNoOverlapWithShelf(aura::Window* root_window) {
  aura::Window* window =
      root_window->GetChildById(kShellWindowId_OverlayContainer);
  gfx::Rect bounds = screen_util::GetDisplayWorkAreaBoundsInParent(window);
  wm::ConvertRectToScreen(root_window, &bounds);

  bounds.Subtract(Shelf::ForWindow(root_window)->GetIdealBounds());
  return bounds;
}

}  // namespace

// static
SnapPosition SplitViewDragIndicators::GetSnapPosition(
    WindowDraggingState window_dragging_state) {
  switch (window_dragging_state) {
    case WindowDraggingState::kToSnapPrimary:
      return SnapPosition::kPrimary;
    case WindowDraggingState::kToSnapSecondary:
      return SnapPosition::kSecondary;
    default:
      return SnapPosition::kNone;
  }
}

// static
SplitViewDragIndicators::WindowDraggingState
SplitViewDragIndicators::ComputeWindowDraggingState(
    bool is_dragging,
    WindowDraggingState non_snap_state,
    SnapPosition snap_position) {
  if (!is_dragging || !ShouldAllowSplitView())
    return WindowDraggingState::kNoDrag;
  switch (snap_position) {
    case SnapPosition::kNone:
      return non_snap_state;
    case SnapPosition::kPrimary:
      return WindowDraggingState::kToSnapPrimary;
    case SnapPosition::kSecondary:
      return WindowDraggingState::kToSnapSecondary;
  }
}

// View which contains a label and is meant to be rotated. Used by and rotated
// by `SplitViewDragIndicatorsView`.
class SplitViewDragIndicators::RotatedImageLabelView
    : public views::BoxLayoutView {
  METADATA_HEADER(RotatedImageLabelView, views::BoxLayoutView)

 public:
  explicit RotatedImageLabelView(bool is_right_or_bottom)
      : is_right_or_bottom_(is_right_or_bottom) {
    SetOrientation(views::BoxLayout::Orientation::kVertical);
    SetInsideBorderInsets(gfx::Insets::VH(kSplitviewLabelVerticalInsetDp,
                                          kSplitviewLabelHorizontalInsetDp));
    SetPaintToLayer();
    layer()->SetFillsBoundsOpaquely(false);

    SetBackground(views::CreateThemedRoundedRectBackground(
        cros_tokens::kCrosSysSystemBaseElevated,
        kSplitviewLabelRoundRectRadiusDp));

    SetBorder(std::make_unique<views::HighlightBorder>(
        /*corner_radius=*/kSplitviewLabelRoundRectRadiusDp,
        views::HighlightBorder::Type::kHighlightBorder1));

    label_ = AddChildView(std::make_unique<views::Label>(
        std::u16string(), views::style::CONTEXT_LABEL));
    label_->SetFontList(views::Label::GetDefaultFontList().Derive(
        2, gfx::Font::FontStyle::NORMAL, gfx::Font::Weight::NORMAL));
    label_->SetEnabledColorId(cros_tokens::kCrosSysOnSurface);
  }

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

  ~RotatedImageLabelView() override = default;

  // Called to update the opacity of the labels view on |indicator_state|.
  void OnWindowDraggingStateChanged(
      WindowDraggingState window_dragging_state,
      WindowDraggingState previous_window_dragging_state,
      bool can_dragged_window_be_snapped) {
    // No top label for dragging from the top in portrait orientation.
    if (window_dragging_state == WindowDraggingState::kFromTop &&
        !IsCurrentScreenOrientationLandscape() && !is_right_or_bottom_) {
      return;
    }

    // If there is no drag currently in this display, any label that is showing
    // shall fade out with the corresponding indicator.
    if (window_dragging_state == WindowDraggingState::kNoDrag ||
        window_dragging_state == WindowDraggingState::kOtherDisplay) {
      DoSplitviewOpacityAnimation(
          layer(), SPLITVIEW_ANIMATION_TEXT_FADE_OUT_WITH_HIGHLIGHT);
      return;
    }

    // When a snap preview is shown, any label that is showing shall fade out.
    if (GetSnapPosition(window_dragging_state) != SnapPosition::kNone) {
      DoSplitviewOpacityAnimation(layer(), SPLITVIEW_ANIMATION_TEXT_FADE_OUT);
      return;
    }

    // Set the text according to |can_dragged_window_be_snapped|.
    label_->SetText(l10n_util::GetStringUTF16(
        can_dragged_window_be_snapped ? IDS_ASH_SPLIT_VIEW_GUIDANCE
                                      : IDS_ASH_SPLIT_VIEW_CANNOT_SNAP));

    // When dragging begins in this display or comes in from another display, if
    // there is now no snap preview, fade in with an indicator.
    if (previous_window_dragging_state == WindowDraggingState::kNoDrag ||
        previous_window_dragging_state == WindowDraggingState::kOtherDisplay) {
      DoSplitviewOpacityAnimation(
          layer(), SPLITVIEW_ANIMATION_TEXT_FADE_IN_WITH_HIGHLIGHT);
      return;
    }

    // If a snap preview was shown, the labels shall now fade in.
    if (GetSnapPosition(previous_window_dragging_state) !=
        SnapPosition::kNone) {
      DoSplitviewOpacityAnimation(layer(), SPLITVIEW_ANIMATION_TEXT_FADE_IN);
      return;
    }
  }

 private:
  // True if the label view is the right/bottom side one, false if it is the
  // left/top one.
  const bool is_right_or_bottom_;

  raw_ptr<views::Label> label_ = nullptr;
};

BEGIN_METADATA(SplitViewDragIndicators, RotatedImageLabelView)
END_METADATA

// View which contains two highlights on each side indicator where a user should
// drag a selected window in order to initiate splitview. Each highlight has a
// label with instructions to further guide users. The highlights are on the
// left and right of the display in landscape mode, and on the top and bottom of
// the display in landscape mode. The highlights can expand and shrink if a
// window has entered a snap region to display the bounds of the window, if it
// were to get snapped.
class SplitViewDragIndicators::SplitViewDragIndicatorsView
    : public views::View,
      public aura::WindowObserver {
  METADATA_HEADER(SplitViewDragIndicatorsView, views::View)

 public:
  SplitViewDragIndicatorsView() {
    left_highlight_view_ = AddChildView(
        std::make_unique<SplitViewHighlightView>(/*is_right_or_bottom=*/false));
    right_highlight_view_ = AddChildView(
        std::make_unique<SplitViewHighlightView>(/*is_right_or_bottom=*/true));

    left_rotated_view_ = AddChildView(
        std::make_unique<RotatedImageLabelView>(/*is_right_or_bottom=*/false));
    right_rotated_view_ = AddChildView(
        std::make_unique<RotatedImageLabelView>(/*is_right_or_bottom=*/true));

    // Nothing is shown initially.
    left_highlight_view_->layer()->SetOpacity(0.f);
    right_highlight_view_->layer()->SetOpacity(0.f);
    left_rotated_view_->layer()->SetOpacity(0.f);
    right_rotated_view_->layer()->SetOpacity(0.f);
  }

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

  ~SplitViewDragIndicatorsView() override {
    if (dragged_window_)
      dragged_window_->RemoveObserver(this);
  }

  const SplitViewHighlightView* left_highlight_view() const {
    return left_highlight_view_;
  }
  const SplitViewHighlightView* right_highlight_view() const {
    return right_highlight_view_;
  }

  // Called by parent widget when the state machine changes. Handles setting the
  // opacity and bounds of the highlights and labels.
  void OnWindowDraggingStateChanged(WindowDraggingState window_dragging_state) {
    DCHECK_NE(window_dragging_state_, window_dragging_state);
    previous_window_dragging_state_ = window_dragging_state_;
    window_dragging_state_ = window_dragging_state;

    SplitViewController* split_view_controller =
        SplitViewController::Get(GetWidget()->GetNativeWindow());
    const bool previews_only =
        window_dragging_state == WindowDraggingState::kFromShelf ||
        window_dragging_state == WindowDraggingState::kFromTop ||
        window_dragging_state == WindowDraggingState::kFromFloat ||
        split_view_controller->InSplitViewMode();
    const bool can_dragged_window_be_snapped =
        dragged_window_ && split_view_controller->CanSnapWindow(
                               dragged_window_, chromeos::kDefaultSnapRatio);
    if (!previews_only) {
      left_rotated_view_->OnWindowDraggingStateChanged(
          window_dragging_state, previous_window_dragging_state_,
          can_dragged_window_be_snapped);
      right_rotated_view_->OnWindowDraggingStateChanged(
          window_dragging_state, previous_window_dragging_state_,
          can_dragged_window_be_snapped);
    }
    left_highlight_view_->OnWindowDraggingStateChanged(
        window_dragging_state, previous_window_dragging_state_, previews_only,
        can_dragged_window_be_snapped);
    right_highlight_view_->OnWindowDraggingStateChanged(
        window_dragging_state, previous_window_dragging_state_, previews_only,
        can_dragged_window_be_snapped);

    if (window_dragging_state != WindowDraggingState::kNoDrag ||
        GetSnapPosition(previous_window_dragging_state_) !=
            SnapPosition::kNone) {
      Layout(previous_window_dragging_state_ != WindowDraggingState::kNoDrag);
    }
  }

  views::View* GetViewForIndicatorType(IndicatorType type) {
    switch (type) {
      case IndicatorType::kLeftHighlight:
        return left_highlight_view_;
      case IndicatorType::kLeftText:
        return left_rotated_view_;
      case IndicatorType::kRightHighlight:
        return right_highlight_view_;
      case IndicatorType::kRightText:
        return right_rotated_view_;
    }
  }

  void SetDraggedWindow(aura::Window* dragged_window) {
    if (dragged_window_)
      dragged_window_->RemoveObserver(this);
    dragged_window_ = dragged_window;
    if (dragged_window)
      dragged_window->AddObserver(this);
  }

  // views::View:
  void Layout(PassKey) override { Layout(/*animate=*/false); }

  // aura::WindowObserver:
  void OnWindowDestroyed(aura::Window* window) override {
    DCHECK_EQ(dragged_window_, window);
    dragged_window_ = nullptr;
  }

 private:
  // Layout the bounds of the highlight views and helper labels. One should
  // animate when changing states, but not when bounds or orientation is
  // changed.
  void Layout(bool animate) {
    if (!dragged_window_) {
      // This can be called during test teardown.
      return;
    }
    // TODO(b/252514604): Attempt to simplify this logic.
    const bool horizontal = IsLayoutHorizontal(GetWidget()->GetNativeWindow());
    const int display_width = horizontal ? width() : height();
    const int display_height = horizontal ? height() : width();
    // Calculate the bounds of the two highlight regions.
    const int highlight_width =
        display_width * kHighlightScreenPrimaryAxisRatio;
    const int highlight_height =
        display_height - 2 * kHighlightScreenEdgePaddingDp;
    gfx::Size highlight_size(highlight_width, highlight_height);

    // When one highlight expands to become a preview area, the other highlight
    // contracts to this width.
    const int other_highlight_width =
        display_width * kOtherHighlightScreenPrimaryAxisRatio;

    // The origin of the right highlight view in horizontal split view layout,
    // or the bottom highlight view in vertical split view layout.
    gfx::Point right_bottom_origin(
        display_width - highlight_width - kHighlightScreenEdgePaddingDp,
        kHighlightScreenEdgePaddingDp);

    const gfx::Point highlight_padding_point(kHighlightScreenEdgePaddingDp,
                                             kHighlightScreenEdgePaddingDp);
    gfx::Rect left_highlight_bounds(highlight_padding_point, highlight_size);
    gfx::Rect right_highlight_bounds(right_bottom_origin, highlight_size);
    if (!horizontal) {
      left_highlight_bounds.Transpose();
      right_highlight_bounds.Transpose();
    }

    // True when the drag ends in a snap area, meaning that the dragged window
    // actually becomes snapped.
    const bool drag_ending_in_snap =
        window_dragging_state_ == WindowDraggingState::kNoDrag &&
        GetSnapPosition(previous_window_dragging_state_) != SnapPosition::kNone;

    SnapPosition snap_position = GetSnapPosition(window_dragging_state_);
    if (snap_position == SnapPosition::kNone) {
      snap_position = GetSnapPosition(previous_window_dragging_state_);
    }

    gfx::Rect preview_area_bounds;
    std::optional<SplitviewAnimationType> left_highlight_animation_type;
    std::optional<SplitviewAnimationType> right_highlight_animation_type;
    if (GetSnapPosition(window_dragging_state_) != SnapPosition::kNone ||
        drag_ending_in_snap) {
      // When we drag to snap, we should attempt to preview the size of the
      // window snapped in split view below if there is any, but respect the
      // minimum size of `dragged_window_`. See crbug/1017464.
      aura::Window* root_window = GetWidget()->GetNativeWindow();
      // Use `chromeos::kDefaultSnapRatio` to calculate the default divider
      // position. If there is a snapped window in `SplitViewOverviewSession`,
      // calculate the divider position based on the snapped window bounds as it
      // can be resized to an arbitrary location.
      // Note `dragged_window_` may not be on the same root as `root_window`.
      // Check the partial overview session on `root_window`, the root it's
      // being dragged to.
      // TODO(b/309856199): Consolidate the divider position calculation.
      SplitViewOverviewSession* split_view_overview_session =
          RootWindowController::ForWindow(root_window)
              ->split_view_overview_session();
      const bool should_consider_divider =
          SplitViewController::Get(root_window)->ShouldConsiderDivider();
      const int divider_position =
          split_view_overview_session
              ? GetEquivalentDividerPosition(
                    split_view_overview_session->window(),
                    should_consider_divider)
              : CalculateDividerPosition(root_window, snap_position,
                                         chromeos::kDefaultSnapRatio,
                                         should_consider_divider);
      preview_area_bounds =
          gfx::Rect(CalculateSnappedWindowBoundsInScreen(
                        snap_position, root_window,
                        /*window_for_minimum_size=*/dragged_window_,
                        should_consider_divider, divider_position,
                        /*is_resizing_with_divider=*/false)
                        .size());

      if (!drag_ending_in_snap)
        preview_area_bounds.Inset(kHighlightScreenEdgePaddingDp);

      // Calculate the bounds of the other highlight, which is the one that
      // shrinks and fades away, while the other one, the preview area, expands
      // and takes up half the screen.
      gfx::Rect other_bounds(
          display_width - other_highlight_width - kHighlightScreenEdgePaddingDp,
          kHighlightScreenEdgePaddingDp, other_highlight_width,
          display_height - 2 * kHighlightScreenEdgePaddingDp);
      if (!horizontal)
        other_bounds.Transpose();

      if (IsPhysicallyLeftOrTop(snap_position, dragged_window_)) {
        left_highlight_bounds = preview_area_bounds;
        right_highlight_bounds = other_bounds;
        if (animate) {
          if (drag_ending_in_snap) {
            left_highlight_animation_type =
                SPLITVIEW_ANIMATION_PREVIEW_AREA_NIX_INSET;
          } else {
            left_highlight_animation_type =
                SPLITVIEW_ANIMATION_PREVIEW_AREA_SLIDE_IN;
            right_highlight_animation_type =
                SPLITVIEW_ANIMATION_OTHER_HIGHLIGHT_SLIDE_OUT;
          }
        }
      } else {
        preview_area_bounds.set_origin(
            gfx::Point(width() - kHighlightScreenEdgePaddingDp -
                           preview_area_bounds.width(),
                       height() - kHighlightScreenEdgePaddingDp -
                           preview_area_bounds.height()));
        other_bounds.set_origin(highlight_padding_point);
        left_highlight_bounds = other_bounds;
        right_highlight_bounds = preview_area_bounds;
        if (animate) {
          if (drag_ending_in_snap) {
            right_highlight_animation_type =
                SPLITVIEW_ANIMATION_PREVIEW_AREA_NIX_INSET;
          } else {
            left_highlight_animation_type =
                SPLITVIEW_ANIMATION_OTHER_HIGHLIGHT_SLIDE_OUT;
            right_highlight_animation_type =
                SPLITVIEW_ANIMATION_PREVIEW_AREA_SLIDE_IN;
          }
        }
      }
    } else if (GetSnapPosition(previous_window_dragging_state_) !=
                   SnapPosition::kNone &&
               animate) {
      if (IsPhysicallyLeftOrTop(snap_position, dragged_window_)) {
        left_highlight_animation_type =
            SPLITVIEW_ANIMATION_PREVIEW_AREA_SLIDE_OUT;
        right_highlight_animation_type =
            SPLITVIEW_ANIMATION_OTHER_HIGHLIGHT_SLIDE_IN;
      } else {
        left_highlight_animation_type =
            SPLITVIEW_ANIMATION_OTHER_HIGHLIGHT_SLIDE_IN;
        right_highlight_animation_type =
            SPLITVIEW_ANIMATION_PREVIEW_AREA_SLIDE_OUT;
      }
    }

    left_highlight_view_->SetBounds(GetMirroredRect(left_highlight_bounds),
                                    left_highlight_animation_type);
    right_highlight_view_->SetBounds(GetMirroredRect(right_highlight_bounds),
                                     right_highlight_animation_type);

    // Calculate the bounds of the views which contain the guidance text and
    // icon. Rotate the two views in horizontal split view layout.
    const gfx::Size size(right_rotated_view_->GetPreferredSize().width(),
                         kSplitviewLabelPreferredHeightDp);
    if (!horizontal)
      highlight_size.SetSize(highlight_size.height(), highlight_size.width());
    gfx::Rect left_rotated_bounds(
        highlight_size.width() / 2 - size.width() / 2,
        highlight_size.height() / 2 - size.height() / 2, size.width(),
        size.height());
    gfx::Rect right_rotated_bounds = left_rotated_bounds;
    left_rotated_bounds.Offset(highlight_padding_point.x(),
                               highlight_padding_point.y());
    if (!horizontal) {
      right_bottom_origin.SetPoint(right_bottom_origin.y(),
                                   right_bottom_origin.x());
    }
    right_rotated_bounds.Offset(right_bottom_origin.x(),
                                right_bottom_origin.y());

    // In portrait mode, there is no need to rotate the text and warning icon.
    // In horizontal split view layout, rotate the left text 90 degrees
    // clockwise in rtl and 90 degress anti clockwise in ltr. The right text is
    // rotated 90 degrees in the opposite direction of the left text.
    double left_rotation_angle = 0.0;
    if (horizontal)
      left_rotation_angle = 90.0 * (base::i18n::IsRTL() ? 1 : -1);

    const gfx::Transform left_rotation = ComputeRotateAroundCenterTransform(
        left_rotated_bounds, left_rotation_angle);
    const gfx::Transform right_rotation = ComputeRotateAroundCenterTransform(
        right_rotated_bounds, -left_rotation_angle);

    left_rotated_view_->SetBoundsRect(left_rotated_bounds);
    right_rotated_view_->SetBoundsRect(right_rotated_bounds);

    if (drag_ending_in_snap) {
      left_rotated_view_->layer()->SetTransform(left_rotation);
      right_rotated_view_->layer()->SetTransform(right_rotation);
      return;
    }

    // If we want to display a window can be snapped, one side will show a
    // preview that is half the work area of what the window size would be; that
    // is the `preview_label_layer`. The other side would fade and slide out;
    // that is the `other_highlight_label_layer`.
    ui::Layer *preview_label_layer;
    ui::Layer *other_highlight_label_layer;
    gfx::Transform preview_label_transform;
    gfx::Transform other_highlight_label_transform;
    if (snap_position == SnapPosition::kNone) {
      preview_label_layer = nullptr;
      other_highlight_label_layer = nullptr;
    } else if (IsPhysicallyLeftOrTop(snap_position, dragged_window_)) {
      preview_label_layer = left_rotated_view_->layer();
      other_highlight_label_layer = right_rotated_view_->layer();
      preview_label_transform = left_rotation;
      other_highlight_label_transform = right_rotation;
    } else {
      preview_label_layer = right_rotated_view_->layer();
      other_highlight_label_layer = left_rotated_view_->layer();
      preview_label_transform = right_rotation;
      other_highlight_label_transform = left_rotation;
    }

    // Slide out the labels when a snap preview appears. This code also adjusts
    // the label transforms for things like display rotation while there is a
    // snap preview.
    if (GetSnapPosition(window_dragging_state_) != SnapPosition::kNone) {
      // How far each label shall slide to stay centered in the corresponding
      // highlight as it expands/contracts. Include distance traveled with zero
      // opacity (whence a label still slides, not only for simplicity in
      // calculating the values below, but also to facilitate that the label
      // transform and the highlight transform have matching easing).
      float preview_label_delta =
          0.5f * (preview_area_bounds.width() - highlight_width);
      float other_highlight_label_delta =
          0.5f * (highlight_width - other_highlight_width);

      // Positive (unchanged) for left or up; negative for right or down.
      if (!IsPhysicallyLeftOrTop(snap_position, dragged_window_)) {
        preview_label_delta = -preview_label_delta;
        other_highlight_label_delta = -other_highlight_label_delta;
      }

      // x-axis if `horizontal`; else y-axis.
      gfx::Vector2dF preview_label_translation(preview_label_delta, 0.f);
      gfx::Vector2dF other_highlight_label_translation(
          other_highlight_label_delta, 0.f);
      if (!horizontal) {
        preview_label_translation.Transpose();
        other_highlight_label_translation.Transpose();
      }

      // Append the translation to the end of the current transform, which may
      // have rotated the label.
      preview_label_transform.PostTranslate(preview_label_translation);
      other_highlight_label_transform.PostTranslate(
          other_highlight_label_translation);

      if (animate) {
        // Animate the labels sliding out.
        DoSplitviewTransformAnimation(
            preview_label_layer,
            SPLITVIEW_ANIMATION_PREVIEW_AREA_TEXT_SLIDE_OUT,
            preview_label_transform, /*animation_observers=*/{});
        DoSplitviewTransformAnimation(
            other_highlight_label_layer,
            SPLITVIEW_ANIMATION_OTHER_HIGHLIGHT_TEXT_SLIDE_OUT,
            other_highlight_label_transform, /*animation_observers=*/{});
      } else {
        preview_label_layer->SetTransform(preview_label_transform);
        other_highlight_label_layer->SetTransform(
            other_highlight_label_transform);
      }
      return;
    }

    // Slide in the labels when a snap preview disappears because you drag
    // inward. (Having reached this code, we know that the window is not
    // becoming snapped, because that case is handled earlier and we bail out.)
    if (GetSnapPosition(previous_window_dragging_state_) !=
        SnapPosition::kNone) {
      if (animate) {
        // Animate the labels sliding in.
        DoSplitviewTransformAnimation(
            preview_label_layer, SPLITVIEW_ANIMATION_PREVIEW_AREA_TEXT_SLIDE_IN,
            preview_label_transform, /*animation_observers=*/{});
        DoSplitviewTransformAnimation(
            other_highlight_label_layer,
            SPLITVIEW_ANIMATION_OTHER_HIGHLIGHT_TEXT_SLIDE_IN,
            other_highlight_label_transform,
            /*animation_observers=*/{});
      } else {
        preview_label_layer->SetTransform(preview_label_transform);
        other_highlight_label_layer->SetTransform(
            other_highlight_label_transform);
      }
      return;
    }

    // Set a rotation without animation for the default cases.
    left_rotated_view_->layer()->SetTransform(left_rotation);
    right_rotated_view_->layer()->SetTransform(right_rotation);
  }

  raw_ptr<SplitViewHighlightView> left_highlight_view_ = nullptr;
  raw_ptr<SplitViewHighlightView> right_highlight_view_ = nullptr;
  raw_ptr<RotatedImageLabelView> left_rotated_view_ = nullptr;
  raw_ptr<RotatedImageLabelView> right_rotated_view_ = nullptr;

  WindowDraggingState window_dragging_state_ = WindowDraggingState::kNoDrag;
  WindowDraggingState previous_window_dragging_state_ =
      WindowDraggingState::kNoDrag;

  raw_ptr<aura::Window> dragged_window_ = nullptr;
};

BEGIN_METADATA(SplitViewDragIndicators, SplitViewDragIndicatorsView)
END_METADATA

SplitViewDragIndicators::SplitViewDragIndicators(aura::Window* root_window)
    : root_window_(root_window) {}

SplitViewDragIndicators::~SplitViewDragIndicators() {
  if (!widget_) {
    return;
  }
  // Allow some extra time for animations to finish.
  aura::Window* window = widget_->GetNativeWindow();
  if (window == nullptr)
    return;
  wm::SetWindowVisibilityAnimationType(
      window, WINDOW_VISIBILITY_ANIMATION_TYPE_STEP_END);
  AnimateOnChildWindowVisibilityChanged(window, /*visible=*/false);
}

void SplitViewDragIndicators::SetDraggedWindow(aura::Window* dragged_window) {
  DCHECK_EQ(WindowDraggingState::kNoDrag, current_window_dragging_state_);
  GetOrCreateIndicatorsView().SetDraggedWindow(dragged_window);
}

void SplitViewDragIndicators::SetWindowDraggingState(
    WindowDraggingState window_dragging_state) {
  if (window_dragging_state == current_window_dragging_state_)
    return;

  // Fire a haptic event if necessary.
  if (GetSnapPosition(window_dragging_state) != SnapPosition::kNone) {
    OverviewController* overview_controller =
        Shell::Get()->overview_controller();
    if (overview_controller->InOverviewSession() &&
        overview_controller->overview_session()->window_drag_controller() &&
        !overview_controller->overview_session()
             ->window_drag_controller()
             ->is_touch_dragging()) {
      chromeos::haptics_util::PlayHapticTouchpadEffect(
          ui::HapticTouchpadEffect::kSnap,
          ui::HapticTouchpadEffectStrength::kMedium);
    }
  }

  current_window_dragging_state_ = window_dragging_state;
  GetOrCreateIndicatorsView().OnWindowDraggingStateChanged(
      window_dragging_state);
}

void SplitViewDragIndicators::OnDisplayBoundsChanged() {
  if (widget_) {
    widget_->SetBounds(GetWorkAreaBoundsNoOverlapWithShelf(root_window_));
  }
}

gfx::Rect SplitViewDragIndicators::GetLeftHighlightViewBounds() const {
  return indicators_view_ ? indicators_view_->left_highlight_view()->bounds()
                          : gfx::Rect();
}

void SplitViewDragIndicators::InitWidget() {
  if (widget_) {
    return;
  }
  widget_ = CreateWidget(root_window_);
  widget_->SetBounds(GetWorkAreaBoundsNoOverlapWithShelf(root_window_));
  CHECK(!indicators_view_);
  indicators_view_ =
      widget_->SetContentsView(std::make_unique<SplitViewDragIndicatorsView>());
  widget_->Show();
}

gfx::Rect SplitViewDragIndicators::GetRightHighlightViewBoundsForTesting()
    const {
  return indicators_view_ ? indicators_view_->right_highlight_view()->bounds()
                          : gfx::Rect();
}

bool SplitViewDragIndicators::GetIndicatorTypeVisibilityForTesting(
    IndicatorType type) const {
  return indicators_view_ ? indicators_view_->GetViewForIndicatorType(type)
                                    ->layer()
                                    ->opacity() > 0.f
                          : false;
}

SplitViewDragIndicators::SplitViewDragIndicatorsView&
SplitViewDragIndicators::GetOrCreateIndicatorsView() {
  InitWidget();
  return *indicators_view_;
}

}  // namespace ash