app_list: Make over scroll animation faster.

ui/app_list/contents_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/app_list/contents_view.h"
 
 #include <algorithm>
 
+#include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_view.h"
 #include "ui/app_list/apps_grid_view.h"
 #include "ui/app_list/pagination_model.h"
 #include "ui/app_list/search_result_list_view.h"
 #include "ui/base/events/event.h"
 #include "ui/views/animation/bounds_animator.h"
 #include "ui/views/view_model.h"
 #include "ui/views/view_model_utils.h"
 
 namespace app_list {
 
 namespace {
 
 const int kPreferredIconDimension = 48;
 const int kPreferredCols = 4;
 const int kPreferredRows = 4;
 
 // Indexes of interesting views in ViewModel of ContentsView.
 const int kIndexAppsGrid = 0;
 const int kIndexSearchResults = 1;
 
 const int kMinMouseWheelToSwitchPage = 20;
 const int kMinScrollToSwitchPage = 20;
 const int kMinHorizVelocityToSwitchPage = 800;
 
 const double kFinishTransitionThreshold = 0.33;
-const int kTransitionAnimationDurationInMs = 180;
 
 // Helpers to get certain child view from |model|.
 AppsGridView* GetAppsGridView(views::ViewModel* model) {
   return static_cast<AppsGridView*>(model->view_at(kIndexAppsGrid));
 }
 
 SearchResultListView* GetSearchResultListView(views::ViewModel* model) {
   return static_cast<SearchResultListView*>(
       model->view_at(kIndexSearchResults));
 }
 
 }  // namespace
 
 ContentsView::ContentsView(AppListView* app_list_view,
                            PaginationModel* pagination_model)
     : show_state_(SHOW_APPS),
       pagination_model_(pagination_model),
       view_model_(new views::ViewModel),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           bounds_animator_(new views::BoundsAnimator(this))) {
-  pagination_model_->SetTransitionDuration(kTransitionAnimationDurationInMs);
+  pagination_model_->SetTransitionDurations(
+      kPageTransitionDurationInMs,
+      kOverscrollPageTransitionDurationMs);
 
   AppsGridView* apps_grid_view = new AppsGridView(app_list_view,
                                                   pagination_model);
   apps_grid_view->SetLayout(kPreferredIconDimension,
                             kPreferredCols,
                             kPreferredRows);
   AddChildView(apps_grid_view);
   view_model_->Add(apps_grid_view, kIndexAppsGrid);
 
   SearchResultListView* search_results_view = new SearchResultListView(
@@ skipping 159 matching lines @@
       pagination_model_->SelectPageRelative(event->x_offset() > 0 ? -1 : 1,
                                             true);
     }
     return ui::ER_HANDLED;
   }
 
   return ui::ER_UNHANDLED;
 }
 
 }  // namespace app_list