Revert of CrOS: Fix appearance of notification toasts when sliding out via gesture

ui/message_center/views/slide_out_controller.cc

Index: ui/message_center/views/slide_out_controller.cc
diff --git a/ui/message_center/views/slide_out_controller.cc b/ui/message_center/views/slide_out_controller.cc
deleted file mode 100644
index 68883b672db5c8d28770dd095ce7a9e91c9828a8..0000000000000000000000000000000000000000
--- a/ui/message_center/views/slide_out_controller.cc
+++ /dev/null
@@ -1,109 +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/message_center/views/slide_out_controller.h"
-
-#include "ui/compositor/layer.h"
-#include "ui/compositor/scoped_layer_animation_settings.h"
-#include "ui/gfx/transform.h"
-
-namespace views {
-
-SlideOutController::SlideOutController(ui::EventTarget* target,
-                                       Delegate* delegate)
-    : target_handling_(target, this), delegate_(delegate) {}
-
-SlideOutController::~SlideOutController() {}
-
-void SlideOutController::OnGestureEvent(ui::GestureEvent* event) {
-  const float kScrollRatioForClosingNotification = 0.5f;
-
-  if (event->type() == ui::ET_SCROLL_FLING_START) {
-    // The threshold for the fling velocity is computed empirically.
-    // The unit is in pixels/second.
-    const float kFlingThresholdForClose = 800.f;
-    if (enabled_ &&
-        fabsf(event->details().velocity_x()) > kFlingThresholdForClose) {
-      SlideOutAndClose(event->details().velocity_x());
-      event->StopPropagation();
-      return;
-    }
-    RestoreVisualState();
-    return;
-  }
-
-  if (!event->IsScrollGestureEvent())
-    return;
-
-  ui::Layer* layer = delegate_->GetSlideOutLayer();
-  int width = layer->bounds().width();
-  if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
-    gesture_amount_ = 0.f;
-  } else if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
-    // The scroll-update events include the incremental scroll amount.
-    gesture_amount_ += event->details().scroll_x();
-
-    float scroll_amount;
-    if (enabled_) {
-      scroll_amount = gesture_amount_;
-      layer->SetOpacity(1.f - std::min(fabsf(scroll_amount) / width, 1.f));
-    } else {
-      if (gesture_amount_ >= 0) {
-        scroll_amount = std::min(0.5f * gesture_amount_,
-                                 width * kScrollRatioForClosingNotification);
-      } else {
-        scroll_amount =
-            std::max(0.5f * gesture_amount_,
-                     -1.f * width * kScrollRatioForClosingNotification);
-      }
-    }
-
-    gfx::Transform transform;
-    transform.Translate(scroll_amount, 0.0);
-    layer->SetTransform(transform);
-  } else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
-    float scrolled_ratio = fabsf(gesture_amount_) / width;
-    if (enabled_ && scrolled_ratio >= kScrollRatioForClosingNotification) {
-      SlideOutAndClose(gesture_amount_);
-      event->StopPropagation();
-      return;
-    }
-    RestoreVisualState();
-  }
-
-  event->SetHandled();
-}
-
-void SlideOutController::RestoreVisualState() {
-  ui::Layer* layer = delegate_->GetSlideOutLayer();
-  // Restore the layer state.
-  const int kSwipeRestoreDurationMS = 150;
-  ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
-  settings.SetTransitionDuration(
-      base::TimeDelta::FromMilliseconds(kSwipeRestoreDurationMS));
-  layer->SetTransform(gfx::Transform());
-  layer->SetOpacity(1.f);
-}
-
-void SlideOutController::SlideOutAndClose(int direction) {
-  ui::Layer* layer = delegate_->GetSlideOutLayer();
-  const int kSwipeOutTotalDurationMS = 150;
-  int swipe_out_duration = kSwipeOutTotalDurationMS * layer->opacity();
-  ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
-  settings.SetTransitionDuration(
-      base::TimeDelta::FromMilliseconds(swipe_out_duration));
-  settings.AddObserver(this);
-
-  gfx::Transform transform;
-  int width = layer->bounds().width();
-  transform.Translate(direction < 0 ? -width : width, 0.0);
-  layer->SetTransform(transform);
-  layer->SetOpacity(0.f);
-}
-
-void SlideOutController::OnImplicitAnimationsCompleted() {
-  delegate_->OnSlideOut();
-}
-
-}  // namespace views