events: Change gesture-event handler in EventHandler to not return any values.

ui/views/controls/slide_out_view.cc

 // 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/views/controls/slide_out_view.h"
 
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/transform.h"
 
 namespace views {
 
 SlideOutView::SlideOutView()
     : gesture_scroll_amount_(0.f) {
   SetPaintToLayer(true);
   SetFillsBoundsOpaquely(false);
 }
 
 SlideOutView::~SlideOutView() {
 }
 
-ui::EventResult SlideOutView::OnGestureEvent(ui::GestureEvent* event) {
+void SlideOutView::OnGestureEvent(ui::GestureEvent* event) {
   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 (fabsf(event->details().velocity_x()) > kFlingThresholdForClose) {
       SlideOutAndClose(event->details().velocity_x() < 0 ? SLIDE_LEFT :
                        SLIDE_RIGHT);
-      return ui::ER_CONSUMED;
+      event->StopPropagation();
+      return;
     }
     RestoreVisualState();
-    return ui::ER_UNHANDLED;
+    return;
   }
 
   if (!event->IsScrollGestureEvent())
-    return ui::ER_UNHANDLED;
+    return;
 
   if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
     gesture_scroll_amount_ = 0.f;
   } else if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
     // The scroll-update events include the incremental scroll amount.
     gesture_scroll_amount_ += event->details().scroll_x();
 
     gfx::Transform transform;
     transform.Translate(gesture_scroll_amount_, 0.0);
     layer()->SetTransform(transform);
     layer()->SetOpacity(
         1.f - std::min(fabsf(gesture_scroll_amount_) / width(), 1.f));
   } else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
     const float kScrollRatioForClosingNotification = 0.5f;
     float scrolled_ratio = fabsf(gesture_scroll_amount_) / width();
     if (scrolled_ratio >= kScrollRatioForClosingNotification) {
       SlideOutAndClose(gesture_scroll_amount_ < 0 ? SLIDE_LEFT : SLIDE_RIGHT);
-      return ui::ER_CONSUMED;
+      event->StopPropagation();
+      return;
     }
     RestoreVisualState();
   }
 
-  return ui::ER_HANDLED;
+  event->SetHandled();
 }
 
 void SlideOutView::RestoreVisualState() {
   // 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);
@@ skipping 11 matching lines @@
   transform.Translate(direction == SLIDE_LEFT ? -width() : width(), 0.0);
   layer()->SetTransform(transform);
   layer()->SetOpacity(0.f);
 }
 
 void SlideOutView::OnImplicitAnimationsCompleted() {
   OnSlideOut();
 }
 
 }  // namespace views