wip: Aura-specific implementation of unified touch selection: touch_selection

ui/touch_selection/touch_selection_controller_impl.cc

 // Copyright 2014 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/touch_selection/touch_selection_controller.h"
+#include "ui/touch_selection/touch_selection_controller_impl.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace ui {
 namespace {
 
+// Delay before showing the quick menu, in milliseconds.
+const int kQuickMenuDelayInMs = 100;
+
 gfx::Vector2dF ComputeLineOffsetFromBottom(const SelectionBound& bound) {
   gfx::Vector2dF line_offset =
       gfx::ScaleVector2d(bound.edge_top() - bound.edge_bottom(), 0.5f);
   // An offset of 5 DIPs is sufficient for most line sizes. For small lines,
   // using half the line height avoids synthesizing a point on a line above
   // (or below) the intended line.
   const gfx::Vector2dF kMaxLineOffset(5.f, 5.f);
   line_offset.SetToMin(kMaxLineOffset);
   line_offset.SetToMax(-kMaxLineOffset);
   return line_offset;
 }
 
 TouchHandleOrientation ToTouchHandleOrientation(SelectionBound::Type type) {
   switch (type) {
     case SelectionBound::LEFT:
       return TouchHandleOrientation::LEFT;
     case SelectionBound::RIGHT:
       return TouchHandleOrientation::RIGHT;
     case SelectionBound::CENTER:
       return TouchHandleOrientation::CENTER;
     case SelectionBound::EMPTY:
       return TouchHandleOrientation::UNDEFINED;
   }
   NOTREACHED() << "Invalid selection bound type: " << type;
   return TouchHandleOrientation::UNDEFINED;
 }
 
+void ClipPoint(gfx::PointF* point, const gfx::Rect& clip_rect) {
+  point->SetToMax(clip_rect.origin());
+  point->SetToMin(clip_rect.bottom_right());
+}
+
+void ClipSelectionBound(SelectionBound* bound, const gfx::Rect& clip_rect) {
+  gfx::PointF edge_top = bound->edge_top();
+  gfx::PointF edge_bottom = bound->edge_bottom();
+  ClipPoint(&edge_top, clip_rect);
+  ClipPoint(&edge_bottom, clip_rect);
+  bound->SetEdge(edge_top, edge_bottom);
+}
 }  // namespace
 
-TouchSelectionController::TouchSelectionController(
+TouchSelectionControllerImpl::TouchSelectionControllerImpl(
     TouchSelectionControllerClient* client,
     base::TimeDelta tap_timeout,
     float tap_slop,
     bool show_on_tap_for_empty_editable)
     : client_(client),
       tap_timeout_(tap_timeout),
       tap_slop_(tap_slop),
       show_on_tap_for_empty_editable_(show_on_tap_for_empty_editable),
       response_pending_input_event_(INPUT_EVENT_TYPE_NONE),
       start_orientation_(TouchHandleOrientation::UNDEFINED),
       end_orientation_(TouchHandleOrientation::UNDEFINED),
       is_insertion_active_(false),
       activate_insertion_automatically_(false),
       is_selection_active_(false),
       activate_selection_automatically_(false),
       selection_empty_(false),
       selection_editable_(false),
       temporarily_hidden_(false),
-      selection_handle_dragged_(false) {
+      quick_menu_timer_(FROM_HERE,
+                        base::TimeDelta::FromMilliseconds(kQuickMenuDelayInMs),
+                        base::Bind(&TouchSelectionControllerImpl::ShowQuickMenu,
+                                   base::Unretained(this)),
+                        false),
+      scroll_in_progress_(false),
+      overscroll_in_progress_(false),
+      handle_drag_in_progress_(false),
+      selection_handle_was_dragged_(false) {
   DCHECK(client_);
 }
 
-TouchSelectionController::~TouchSelectionController() {
+TouchSelectionControllerImpl::~TouchSelectionControllerImpl() {
 }
 
-void TouchSelectionController::OnSelectionBoundsChanged(
+bool TouchSelectionControllerImpl::OnSelectionBoundsUpdated(
     const SelectionBound& start,
     const SelectionBound& end) {
   if (start == start_ && end_ == end)
-    return;
+    return false;
 
   start_ = start;
   end_ = end;
   start_orientation_ = ToTouchHandleOrientation(start_.type());
   end_orientation_ = ToTouchHandleOrientation(end_.type());
 
   if (!activate_selection_automatically_ &&
       !activate_insertion_automatically_) {
     DCHECK_EQ(INPUT_EVENT_TYPE_NONE, response_pending_input_event_);
-    return;
+    return false;
   }
 
   // Ensure that |response_pending_input_event_| is cleared after the method
   // completes, while also making its current value available for the duration
   // of the call.
   InputEventType causal_input_event = response_pending_input_event_;
   response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
   base::AutoReset<InputEventType> auto_reset_response_pending_input_event(
       &response_pending_input_event_, causal_input_event);
 
@@ skipping 12 matching lines @@
       start_orientation_ = start_selection_handle_->orientation();
     if (end_orientation_ == TouchHandleOrientation::CENTER)
       end_orientation_ = end_selection_handle_->orientation();
   }
 
   if (GetStartPosition() != GetEndPosition() ||
       (is_selection_dragging &&
        start_orientation_ != TouchHandleOrientation::UNDEFINED &&
        end_orientation_ != TouchHandleOrientation::UNDEFINED)) {
     OnSelectionChanged();
-    return;
+    UpdateQuickMenu();
+    return true;
   }
 
   if (start_orientation_ == TouchHandleOrientation::CENTER &&
       selection_editable_) {
     OnInsertionChanged();
-    return;
+    return true;
   }
 
   HideAndDisallowShowingAutomatically();
+  return true;
 }
 
-bool TouchSelectionController::WillHandleTouchEvent(const MotionEvent& event) {
+bool TouchSelectionControllerImpl::WillHandleTouchEvent(
+    const MotionEvent& event) {
   if (is_insertion_active_) {
     DCHECK(insertion_handle_);
     return insertion_handle_->WillHandleTouchEvent(event);
   }
 
   if (is_selection_active_) {
     DCHECK(start_selection_handle_);
     DCHECK(end_selection_handle_);
     if (start_selection_handle_->is_dragging())
       return start_selection_handle_->WillHandleTouchEvent(event);
 
     if (end_selection_handle_->is_dragging())
       return end_selection_handle_->WillHandleTouchEvent(event);
 
     const gfx::PointF event_pos(event.GetX(), event.GetY());
     if ((event_pos - GetStartPosition()).LengthSquared() <=
         (event_pos - GetEndPosition()).LengthSquared())
       return start_selection_handle_->WillHandleTouchEvent(event);
     else
       return end_selection_handle_->WillHandleTouchEvent(event);
   }
 
   return false;
 }
 
-void TouchSelectionController::OnLongPressEvent() {
+void TouchSelectionControllerImpl::OnLongPressEvent() {
   response_pending_input_event_ = LONG_PRESS;
   ShowSelectionHandlesAutomatically();
   ShowInsertionHandleAutomatically();
   ResetCachedValuesIfInactive();
 }
 
-void TouchSelectionController::AllowShowingFromCurrentSelection() {
+void TouchSelectionControllerImpl::AllowShowingFromCurrentSelection() {
   if (is_selection_active_ || is_insertion_active_)
     return;
 
   activate_selection_automatically_ = true;
   activate_insertion_automatically_ = true;
   if (GetStartPosition() != GetEndPosition())
     OnSelectionChanged();
   else if (start_orientation_ == TouchHandleOrientation::CENTER &&
            selection_editable_)
     OnInsertionChanged();
+  // TODO(mfomitchev): May not be needed
+  UpdateQuickMenu();
 }
 
-void TouchSelectionController::OnTapEvent() {
+void TouchSelectionControllerImpl::OnTapEvent() {
   response_pending_input_event_ = TAP;
   ShowInsertionHandleAutomatically();
   if (selection_empty_ && !show_on_tap_for_empty_editable_)
     DeactivateInsertion();
   ResetCachedValuesIfInactive();
 }
 
-void TouchSelectionController::HideAndDisallowShowingAutomatically() {
+void TouchSelectionControllerImpl::HideAndDisallowShowingAutomatically() {
   response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
   DeactivateInsertion();
   DeactivateSelection();
   activate_insertion_automatically_ = false;
   activate_selection_automatically_ = false;
+  //UpdateQuickMenu(); - DOn't think this is needed
 }
 
-void TouchSelectionController::SetTemporarilyHidden(bool hidden) {
+void TouchSelectionControllerImpl::SetTemporarilyHidden(bool hidden) {
   if (temporarily_hidden_ == hidden)
     return;
   temporarily_hidden_ = hidden;
 
   TouchHandle::AnimationStyle animation_style = GetAnimationStyle(true);
   if (is_selection_active_) {
     start_selection_handle_->SetVisible(GetStartVisible(), animation_style);
     end_selection_handle_->SetVisible(GetEndVisible(), animation_style);
   }
   if (is_insertion_active_)
     insertion_handle_->SetVisible(GetStartVisible(), animation_style);
 }
 
-void TouchSelectionController::OnSelectionEditable(bool editable) {
+void TouchSelectionControllerImpl::OnSelectionEditable(bool editable) {
   if (selection_editable_ == editable)
     return;
   selection_editable_ = editable;
   ResetCachedValuesIfInactive();
   if (!selection_editable_)
     DeactivateInsertion();
+  UpdateQuickMenu();
 }
 
-void TouchSelectionController::OnSelectionEmpty(bool empty) {
+void TouchSelectionControllerImpl::OnSelectionEmpty(bool empty) {
   if (selection_empty_ == empty)
     return;
   selection_empty_ = empty;
   ResetCachedValuesIfInactive();
+  // TODO: Do we really need this?
+  UpdateQuickMenu();
 }
 
-bool TouchSelectionController::Animate(base::TimeTicks frame_time) {
+bool TouchSelectionControllerImpl::Animate(base::TimeTicks frame_time) {
   if (is_insertion_active_)
     return insertion_handle_->Animate(frame_time);
 
   if (is_selection_active_) {
     bool needs_animate = start_selection_handle_->Animate(frame_time);
     needs_animate |= end_selection_handle_->Animate(frame_time);
     return needs_animate;
   }
 
   return false;
 }
 
-void TouchSelectionController::OnHandleDragBegin(const TouchHandle& handle) {
+void TouchSelectionControllerImpl::OnNativeViewMoved() {
+  UpdateQuickMenu();
+}
+
+void TouchSelectionControllerImpl::OnScrollStarted() {
+  scroll_in_progress_ = true;
+  UpdateQuickMenu();
+}
+
+void TouchSelectionControllerImpl::OnScrollCompleted() {
+  scroll_in_progress_ = false;
+  UpdateQuickMenu();
+}
+
+void TouchSelectionControllerImpl::OnOverscrollStarted() {
+  overscroll_in_progress_ = true;
+  UpdateQuickMenu();
+}
+
+void TouchSelectionControllerImpl::OnOverscrollCompleted() {
+  overscroll_in_progress_ = false;
+  UpdateQuickMenu();
+}
+
+void TouchSelectionControllerImpl::OnFlingCompleted() {
+  scroll_in_progress_ = false;
+  UpdateQuickMenu();
+}
+
+void TouchSelectionControllerImpl::OnHandleDragBegin(
+    const TouchHandle& handle) {
   if (&handle == insertion_handle_.get()) {
     client_->OnSelectionEvent(INSERTION_DRAG_STARTED, handle.position());
+    UpdateQuickMenu();
     return;
   }
 
   gfx::PointF base, extent;
   if (&handle == start_selection_handle_.get()) {
     base = end_selection_handle_->position() + GetEndLineOffset();
     extent = start_selection_handle_->position() + GetStartLineOffset();
   } else {
     base = start_selection_handle_->position() + GetStartLineOffset();
     extent = end_selection_handle_->position() + GetEndLineOffset();
   }
-  selection_handle_dragged_ = true;
+  selection_handle_was_dragged_ = true;
 
   // When moving the handle we want to move only the extent point. Before doing
   // so we must make sure that the base point is set correctly.
   client_->SelectBetweenCoordinates(base, extent);
 
   client_->OnSelectionEvent(SELECTION_DRAG_STARTED, handle.position());
+  UpdateQuickMenu();
 }
 
-void TouchSelectionController::OnHandleDragUpdate(const TouchHandle& handle,
+void TouchSelectionControllerImpl::OnHandleDragUpdate(const TouchHandle& handle,
                                                   const gfx::PointF& position) {
   // As the position corresponds to the bottom left point of the selection
   // bound, offset it by half the corresponding line height.
   gfx::Vector2dF line_offset = &handle == start_selection_handle_.get()
                                    ? GetStartLineOffset()
                                    : GetEndLineOffset();
   gfx::PointF line_position = position + line_offset;
-  if (&handle == insertion_handle_.get()) {
+  if (&handle == insertion_handle_.get())
     client_->MoveCaret(line_position);
-  } else {
+  else
     client_->MoveRangeSelectionExtent(line_position);
-  }
 }
 
-void TouchSelectionController::OnHandleDragEnd(const TouchHandle& handle) {
+void TouchSelectionControllerImpl::OnHandleDragEnd(const TouchHandle& handle) {
   if (&handle == insertion_handle_.get())
     client_->OnSelectionEvent(INSERTION_DRAG_STOPPED, handle.position());
   else
     client_->OnSelectionEvent(SELECTION_DRAG_STOPPED, handle.position());
+  UpdateQuickMenu();
 }
 
-void TouchSelectionController::OnHandleTapped(const TouchHandle& handle) {
+void TouchSelectionControllerImpl::OnHandleTapped(const TouchHandle& handle) {
   if (insertion_handle_ && &handle == insertion_handle_.get())
     client_->OnSelectionEvent(INSERTION_TAPPED, handle.position());
 }
 
-void TouchSelectionController::SetNeedsAnimate() {
+void TouchSelectionControllerImpl::SetNeedsAnimate() {
   client_->SetNeedsAnimate();
 }
 
-scoped_ptr<TouchHandleDrawable> TouchSelectionController::CreateDrawable() {
+scoped_ptr<TouchHandleDrawable> TouchSelectionControllerImpl::CreateDrawable() {
   return client_->CreateDrawable();
 }
 
-base::TimeDelta TouchSelectionController::GetTapTimeout() const {
+base::TimeDelta TouchSelectionControllerImpl::GetTapTimeout() const {
   return tap_timeout_;
 }
 
-float TouchSelectionController::GetTapSlop() const {
+float TouchSelectionControllerImpl::GetTapSlop() const {
   return tap_slop_;
 }
 
-void TouchSelectionController::ShowInsertionHandleAutomatically() {
+void TouchSelectionControllerImpl::ShowInsertionHandleAutomatically() {
   if (activate_insertion_automatically_)
     return;
   activate_insertion_automatically_ = true;
   ResetCachedValuesIfInactive();
 }
 
-void TouchSelectionController::ShowSelectionHandlesAutomatically() {
+void TouchSelectionControllerImpl::ShowSelectionHandlesAutomatically() {
   if (activate_selection_automatically_)
     return;
   activate_selection_automatically_ = true;
   ResetCachedValuesIfInactive();
 }
 
-void TouchSelectionController::OnInsertionChanged() {
+void TouchSelectionControllerImpl::OnInsertionChanged() {
   DeactivateSelection();
 
   if (response_pending_input_event_ == TAP && selection_empty_ &&
       !show_on_tap_for_empty_editable_) {
     HideAndDisallowShowingAutomatically();
     return;
   }
 
   if (!activate_insertion_automatically_)
     return;
 
   const bool was_active = is_insertion_active_;
   const gfx::PointF position = GetStartPosition();
   if (!is_insertion_active_)
     ActivateInsertion();
   else
     client_->OnSelectionEvent(INSERTION_MOVED, position);
 
   insertion_handle_->SetVisible(GetStartVisible(),
                                 GetAnimationStyle(was_active));
   insertion_handle_->SetPosition(position);
 }
 
-void TouchSelectionController::OnSelectionChanged() {
+void TouchSelectionControllerImpl::OnSelectionChanged() {
   DeactivateInsertion();
 
   if (!activate_selection_automatically_)
     return;
 
   const bool was_active = is_selection_active_;
   ActivateSelection();
 
   const TouchHandle::AnimationStyle animation = GetAnimationStyle(was_active);
   start_selection_handle_->SetVisible(GetStartVisible(), animation);
   end_selection_handle_->SetVisible(GetEndVisible(), animation);
 
   start_selection_handle_->SetPosition(GetStartPosition());
   end_selection_handle_->SetPosition(GetEndPosition());
 }
 
-void TouchSelectionController::ActivateInsertion() {
+void TouchSelectionControllerImpl::ActivateInsertion() {
   DCHECK(!is_selection_active_);
 
   if (!insertion_handle_)
     insertion_handle_.reset(
         new TouchHandle(this, TouchHandleOrientation::CENTER));
 
   if (!is_insertion_active_) {
     is_insertion_active_ = true;
     insertion_handle_->SetEnabled(true);
     client_->OnSelectionEvent(INSERTION_SHOWN, GetStartPosition());
+    UpdateQuickMenu();
   }
 }
 
-void TouchSelectionController::DeactivateInsertion() {
+void TouchSelectionControllerImpl::DeactivateInsertion() {
   if (!is_insertion_active_)
     return;
   DCHECK(insertion_handle_);
   is_insertion_active_ = false;
   insertion_handle_->SetEnabled(false);
   client_->OnSelectionEvent(INSERTION_CLEARED, gfx::PointF());
+  UpdateQuickMenu();
 }
 
-void TouchSelectionController::ActivateSelection() {
+void TouchSelectionControllerImpl::ActivateSelection() {
   DCHECK(!is_insertion_active_);
 
   if (!start_selection_handle_) {
     start_selection_handle_.reset(new TouchHandle(this, start_orientation_));
   } else {
     start_selection_handle_->SetEnabled(true);
     start_selection_handle_->SetOrientation(start_orientation_);
   }
 
   if (!end_selection_handle_) {
     end_selection_handle_.reset(new TouchHandle(this, end_orientation_));
   } else {
     end_selection_handle_->SetEnabled(true);
     end_selection_handle_->SetOrientation(end_orientation_);
   }
 
   // As a long press received while a selection is already active may trigger
   // an entirely new selection, notify the client but avoid sending an
   // intervening SELECTION_CLEARED update to avoid unnecessary state changes.
   if (!is_selection_active_ || response_pending_input_event_ == LONG_PRESS) {
     if (is_selection_active_) {
       // The active selection session finishes with the start of the new one.
       LogSelectionEnd();
     }
     is_selection_active_ = true;
-    selection_handle_dragged_ = false;
+    selection_handle_was_dragged_ = false;
     selection_start_time_ = base::TimeTicks::Now();
     response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
     client_->OnSelectionEvent(SELECTION_SHOWN, GetStartPosition());
+    UpdateQuickMenu();
   }
 }
 
-void TouchSelectionController::DeactivateSelection() {
+void TouchSelectionControllerImpl::DeactivateSelection() {
   if (!is_selection_active_)
     return;
   DCHECK(start_selection_handle_);
   DCHECK(end_selection_handle_);
   LogSelectionEnd();
   start_selection_handle_->SetEnabled(false);
   end_selection_handle_->SetEnabled(false);
   is_selection_active_ = false;
   client_->OnSelectionEvent(SELECTION_CLEARED, gfx::PointF());
+  UpdateQuickMenu();
 }
 
-void TouchSelectionController::ResetCachedValuesIfInactive() {
+void TouchSelectionControllerImpl::ResetCachedValuesIfInactive() {
   if (is_selection_active_ || is_insertion_active_)
     return;
   start_ = SelectionBound();
   end_ = SelectionBound();
   start_orientation_ = TouchHandleOrientation::UNDEFINED;
   end_orientation_ = TouchHandleOrientation::UNDEFINED;
 }
 
-const gfx::PointF& TouchSelectionController::GetStartPosition() const {
+const gfx::PointF& TouchSelectionControllerImpl::GetStartPosition() const {
   return start_.edge_bottom();
 }
 
-const gfx::PointF& TouchSelectionController::GetEndPosition() const {
+const gfx::PointF& TouchSelectionControllerImpl::GetEndPosition() const {
   return end_.edge_bottom();
 }
 
-gfx::Vector2dF TouchSelectionController::GetStartLineOffset() const {
+gfx::Vector2dF TouchSelectionControllerImpl::GetStartLineOffset() const {
   return ComputeLineOffsetFromBottom(start_);
 }
 
-gfx::Vector2dF TouchSelectionController::GetEndLineOffset() const {
+gfx::Vector2dF TouchSelectionControllerImpl::GetEndLineOffset() const {
   return ComputeLineOffsetFromBottom(end_);
 }
 
-bool TouchSelectionController::GetStartVisible() const {
+bool TouchSelectionControllerImpl::GetStartVisible() const {
   return start_.visible() && !temporarily_hidden_;
 }
 
-bool TouchSelectionController::GetEndVisible() const {
+bool TouchSelectionControllerImpl::GetEndVisible() const {
   return end_.visible() && !temporarily_hidden_;
 }
 
-TouchHandle::AnimationStyle TouchSelectionController::GetAnimationStyle(
+TouchHandle::AnimationStyle TouchSelectionControllerImpl::GetAnimationStyle(
     bool was_active) const {
   return was_active && client_->SupportsAnimation()
              ? TouchHandle::ANIMATION_SMOOTH
              : TouchHandle::ANIMATION_NONE;
 }
 
-void TouchSelectionController::LogSelectionEnd() {
+gfx::Rect TouchSelectionControllerImpl::GetMenuAnchorRect() const {
+  SelectionBound clipped_start = start();
+  SelectionBound clipped_end = end();
+  const gfx::Rect& client_bounds = client_->GetClientBounds();
+  if (clipped_start.visible())
+    ClipSelectionBound(&clipped_start, client_bounds);
+  if (clipped_end.visible())
+    ClipSelectionBound(&clipped_end, client_bounds);
+
+  if (clipped_start.visible() && clipped_end.visible())
+    return RectBetweenSelectionBounds(clipped_start, clipped_end);
+  if (clipped_start.visible()) {
+    return gfx::BoundingRect(clipped_start.edge_top_rounded(),
+                             clipped_start.edge_bottom_rounded());
+  }
+  return gfx::BoundingRect(clipped_end.edge_top_rounded(),
+                           clipped_end.edge_bottom_rounded());
+}
+
+void TouchSelectionControllerImpl::ShowQuickMenu() {

[jdduke (slow), 2015/03/30 15:46:22]

All of this menu code will have to be a no-op on Android for now (i.e., we
shouldn't be firing any timers).

+  DCHECK(is_insertion_active() || is_selection_active());
+
+  if (!start().visible() &&
+      !end().visible())
+    return;
+
+  if (TouchSelectionMenuRunner::GetInstance())
+    client_->ShowQuickMenu(GetMenuAnchorRect());
+}
+
+void TouchSelectionControllerImpl::UpdateQuickMenu() {
+  // Hide quick menu if there is any.
+  client_->HideQuickMenu();
+  quick_menu_timer_.Stop();
+
+  // Start timer to show quick menu if necessary.
+  if (!is_insertion_active() && !is_selection_active())
+    return;
+
+  if (!IsQuickMenuAllowed())
+    return;
+
+  // TODO: test API
+//  if (test_api_ && test_api_->immediate_quick_menu())
+//    ShowQuickMenu();
+//  else
+  quick_menu_timer_.Reset();
+}
+
+bool TouchSelectionControllerImpl::IsQuickMenuAllowed() const {
+  return !scroll_in_progress_ && !overscroll_in_progress_ &&
+         !handle_drag_in_progress_;
+}
+
+void TouchSelectionControllerImpl::LogSelectionEnd() {
   // TODO(mfomitchev): Once we are able to tell the difference between
   // 'successful' and 'unsuccessful' selections - log
   // Event.TouchSelection.Duration instead and get rid of
   // Event.TouchSelectionD.WasDraggeduration.
-  if (selection_handle_dragged_) {
+  if (selection_handle_was_dragged_) {
     base::TimeDelta duration = base::TimeTicks::Now() - selection_start_time_;
     UMA_HISTOGRAM_CUSTOM_TIMES("Event.TouchSelection.WasDraggedDuration",
                                duration,
                                base::TimeDelta::FromMilliseconds(500),
                                base::TimeDelta::FromSeconds(60),
                                60);
   }
 }
 
 }  // namespace ui