Revert "Better coordinate swipe to home gesture and drag handle nudge"

This reverts commit 57098dce.

Reason for revert: Causing test failures: https://bugs.chromium.org/p/chromium/issues/detail?id=1062658

Original change's description:
> Better coordinate swipe to home gesture and drag handle nudge
> 
> Manages the drag handle nudge during window drag from shelf to home or
> overview (which may end up in a gesture the nudge is describing).
> 
> If the contextual nudge is shown when the window drag starts, the nudge
> will not be hidden until the gesture completes (end it will get hidden
> when the gesture completes, even if the user does not end up going
> home).
> 
> If the contextual nudge is scheduled to be shown when the gesture
> starts, the show request will be canceled.
> 
> Adds logic that prevents drag handle nudge from showing up, unless it's
> a result of an explicit user action - tapping the drag handle.
> 
> BUG=1058617
> 
> Change-Id: I96fa2748308143ec42295dbfb472dc564da5bd03
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107135
> Commit-Queue: Toni Baržić <tbarzic@chromium.org>
> Reviewed-by: Manu Cornet <manucornet@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#751200}

TBR=tbarzic@chromium.org,manucornet@chromium.org,yulunwu@chromium.org

Change-Id: I361894e79bf7bb027f690f5a6310874341d51ecf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1058617
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108525Reviewed-by: Dan H <harringtond@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751360}

ash/shelf/drag_handle.cc

@@ -12,7 +12,6 @@
 #include "ash/shell.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/style/ash_color_provider.h"
-#include "ash/wm/overview/overview_controller.h"
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/timer/timer.h"
@@ -104,18 +103,11 @@ bool DragHandle::DoesIntersectRect(const views::View* target,
 }
 
 bool DragHandle::ShowDragHandleNudge() {
-  // Stop observing overview state if nudge show timer has fired.
-  if (!show_drag_handle_nudge_timer_.IsRunning())
-    overview_observer_.RemoveAll();
-
   // Do not show drag handle nudge if it is already shown or drag handle is not
   // visible.
-  if (ShowingNudge() || window_drag_from_shelf_in_progress_ || !GetVisible())
+  if (ShowingNudge() || !GetVisible())
     return false;
   showing_nudge_ = true;
-
-  StopDragHandleNudgeShowTimer();
-
   PrefService* pref =
       Shell::Get()->session_controller()->GetLastActiveUserPrefService();
   base::TimeDelta nudge_duration = contextual_tooltip::GetNudgeTimeout(
@@ -135,16 +127,8 @@ bool DragHandle::ShowDragHandleNudge() {
 }
 
 void DragHandle::ScheduleShowDragHandleNudge() {
-  if (showing_nudge_ || show_drag_handle_nudge_timer_.IsRunning() ||
-      window_drag_from_shelf_in_progress_ ||
-      Shell::Get()->overview_controller()->InOverviewSession()) {
+  if (showing_nudge_)
     return;
-  }
-
-  // Observe overview controller to detect overview session start - this should
-  // cancel the scheduled nudge show.
-  overview_observer_.Add(Shell::Get()->overview_controller());
-
   show_drag_handle_nudge_timer_.Start(
       FROM_HERE, kShowNudgeDelay,
       base::BindOnce(base::IgnoreResult(&DragHandle::ShowDragHandleNudge),
@@ -157,8 +141,7 @@ void DragHandle::SetColorAndOpacity(SkColor color, float opacity) {
 }
 
 void DragHandle::HideDragHandleNudge(bool hidden_by_tap) {
-  StopDragHandleNudgeShowTimer();
-
+  show_drag_handle_nudge_timer_.Stop();
   if (!ShowingNudge())
     return;
   hide_drag_handle_nudge_timer_.Stop();
@@ -166,28 +149,6 @@ void DragHandle::HideDragHandleNudge(bool hidden_by_tap) {
   showing_nudge_ = false;
 }
 
-void DragHandle::SetWindowDragFromShelfInProgress(bool gesture_in_progress) {
-  if (window_drag_from_shelf_in_progress_ == gesture_in_progress)
-    return;
-
-  window_drag_from_shelf_in_progress_ = gesture_in_progress;
-
-  // If the contextual nudge is not yet shown, make sure that any scheduled
-  // nudge show request is canceled.
-  if (!ShowingNudge()) {
-    StopDragHandleNudgeShowTimer();
-    return;
-  }
-
-  // If the drag handle nudge is shown when the gesture to home or overview
-  // starts, keep it around until the gesture completes.
-  if (window_drag_from_shelf_in_progress_) {
-    hide_drag_handle_nudge_timer_.Stop();
-  } else {
-    HideDragHandleNudge(/*hidden_by_tap=*/false);
-  }
-}
-
 void DragHandle::OnGestureEvent(ui::GestureEvent* event) {
   if (!features::AreContextualNudgesEnabled())
     return;
@@ -219,10 +180,6 @@ gfx::Rect DragHandle::GetAnchorBoundsInScreen() const {
   return anchor_bounds;
 }
 
-void DragHandle::OnOverviewModeStarting() {
-  StopDragHandleNudgeShowTimer();
-}
-
 void DragHandle::ShowDragHandleTooltip() {
   DCHECK(!drag_handle_nudge_);
   drag_handle_nudge_ = new ContextualNudge(
@@ -294,7 +251,7 @@ void DragHandle::HideDragHandleNudgeHelper(bool hidden_by_tap) {
     ui::ScopedLayerAnimationSettings opacity_animation_settings(
         opacity_animator);
     opacity_animation_settings.SetPreemptionStrategy(
-        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+        ui::LayerAnimator::ENQUEUE_NEW_ANIMATION);
     opacity_animation_settings.SetTweenType(gfx::Tween::LINEAR);
     opacity_animation_settings.SetTransitionDuration(
         hidden_by_tap ? kDragHandleHideOnTapAnimationDuration
@@ -347,9 +304,4 @@ void DragHandle::HandleTapOnNudge() {
   HideDragHandleNudge(true /*hidden_by_tap*/);
 }
 
-void DragHandle::StopDragHandleNudgeShowTimer() {
-  show_drag_handle_nudge_timer_.Stop();
-  overview_observer_.RemoveAll();
-}
-
 }  // namespace ash

ash/shelf/drag_handle.h

@@ -8,10 +8,7 @@
 #include "ash/ash_export.h"
 #include "ash/shelf/contextual_nudge.h"
 #include "ash/shelf/shelf_widget.h"
-#include "ash/wm/overview/overview_controller.h"
-#include "ash/wm/overview/overview_observer.h"
 #include "base/memory/weak_ptr.h"
-#include "base/scoped_observer.h"
 #include "base/timer/timer.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/views/view.h"
@@ -20,8 +17,7 @@
 namespace ash {
 
 class ASH_EXPORT DragHandle : public views::View,
-                              public views::ViewTargeterDelegate,
-                              public OverviewObserver {
+                              public views::ViewTargeterDelegate {
  public:
   explicit DragHandle(int drag_handle_corner_radius);
   DragHandle(const DragHandle&) = delete;
@@ -49,17 +45,10 @@ class ASH_EXPORT DragHandle : public views::View,
   // tapping the nudge.
   void HideDragHandleNudge(bool hidden_by_tap);
 
-  // Called when the window drag from shelf starts or ends. The drag handle
-  // contextual nudge will remain visible while the gesture is in progress.
-  void SetWindowDragFromShelfInProgress(bool gesture_in_progress);
-
   // views::View:
   void OnGestureEvent(ui::GestureEvent* event) override;
   gfx::Rect GetAnchorBoundsInScreen() const override;
 
-  // OverviewObserver:
-  void OnOverviewModeStarting() override;
-
   bool ShowingNudge() { return showing_nudge_; }
 
   bool has_show_drag_handle_timer_for_testing() {
@@ -74,10 +63,6 @@ class ASH_EXPORT DragHandle : public views::View,
     return hide_drag_handle_nudge_timer_.IsRunning();
   }
 
-  void fire_hide_drag_handle_timer_for_testing() {
-    hide_drag_handle_nudge_timer_.FireNow();
-  }
-
   ContextualNudge* drag_handle_nudge_for_testing() {
     return drag_handle_nudge_;
   }
@@ -105,9 +90,6 @@ class ASH_EXPORT DragHandle : public views::View,
   // Handler for tap gesture on the contextual nudge widget. It hides the nudge.
   void HandleTapOnNudge();
 
-  // Stops the timer to show the drag handle nudge.
-  void StopDragHandleNudgeShowTimer();
-
   // Timer to hide drag handle nudge if it has a timed life.
   base::OneShotTimer hide_drag_handle_nudge_timer_;
 
@@ -116,16 +98,9 @@ class ASH_EXPORT DragHandle : public views::View,
 
   bool showing_nudge_ = false;
 
-  // Whether window drag from shelf (i.e. gesture from in-app shelf to home or
-  // overview) is currently in progress. If the contextual nudge is shown when
-  // the gesture starts, it should remain shown until the gesture ends.
-  // Set by ShelfLayoutManager using SetWindowDragFromShelfInProgress().
-  bool window_drag_from_shelf_in_progress_ = false;
-
   // A label used to educate users about swipe gestures on the drag handle.
   ContextualNudge* drag_handle_nudge_ = nullptr;
 
-  ScopedObserver<OverviewController, OverviewObserver> overview_observer_{this};
   base::WeakPtrFactory<DragHandle> weak_factory_{this};
 };
 

ash/shelf/shelf_layout_manager.cc

@@ -2596,8 +2596,6 @@ bool ShelfLayoutManager::MaybeStartDragWindowFromShelf(
     return false;
   }
 
-  shelf_widget_->GetDragHandle()->SetWindowDragFromShelfInProgress(true);
-
   aura::Window* window =
       GetWindowForDragToHomeOrOverview(event_in_screen.location());
   allow_fling_from_overview_to_home_ = !window;
@@ -2627,8 +2625,6 @@ base::Optional<ShelfWindowDragResult> ShelfLayoutManager::MaybeEndWindowDrag(
   if (!IsWindowDragInProgress())
     return base::nullopt;
 
-  shelf_widget_->GetDragHandle()->SetWindowDragFromShelfInProgress(false);
-
   DCHECK_EQ(drag_status_, kDragInProgress);
   base::Optional<float> velocity_y;
   if (event_in_screen.type() == ui::ET_SCROLL_FLING_START) {
@@ -2650,8 +2646,6 @@ bool ShelfLayoutManager::MaybeEndDragFromOverviewToHome(
     return false;
   }
 
-  shelf_widget_->GetDragHandle()->SetWindowDragFromShelfInProgress(false);
-
   if (event_in_screen.type() != ui::ET_SCROLL_FLING_START)
     return false;
 
@@ -2684,7 +2678,6 @@ void ShelfLayoutManager::MaybeCancelWindowDrag() {
     return;
 
   DCHECK_EQ(drag_status_, kDragInProgress);
-  shelf_widget_->GetDragHandle()->SetWindowDragFromShelfInProgress(false);
   window_drag_controller_->CancelDrag();
 }