Animate the app list search box shadow.

ui/app_list/views/contents_animator.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/app_list/views/contents_animator.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_switches.h"
 #include "ui/app_list/views/app_list_main_view.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/app_list/views/search_box_view.h"
 #include "ui/app_list/views/start_page_view.h"
 #include "ui/gfx/animation/tween.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/shadow_value.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace app_list {
 
+namespace {
+
+gfx::ShadowValue GetSearchBoxShadowForState(AppListModel::State state) {
+  return GetShadowForZHeight(state == AppListModel::STATE_SEARCH_RESULTS ? 1
+                                                                         : 2);
+}
+
+}  // namespace
+
 // ContentsAnimator
 
 ContentsAnimator::ContentsAnimator(ContentsView* contents_view)
     : contents_view_(contents_view) {
 }
 
 ContentsAnimator::~ContentsAnimator() {
 }
 
 gfx::Rect ContentsAnimator::GetOnscreenPageBounds(int page_index) const {
@@ skipping 60 matching lines @@
 
   // These are in ContentsView coordinates.
   gfx::Rect search_box_from(
       contents_view()->GetSearchBoxBoundsForPageIndex(from_page));
   gfx::Rect search_box_to(
       contents_view()->GetSearchBoxBoundsForPageIndex(to_page));
 
   gfx::Rect search_box_rect =
       gfx::Tween::RectValueBetween(progress, search_box_from, search_box_to);
 
+  AppListModel::State from_state =
+      contents_view()->GetStateForPageIndex(from_page);
+  AppListModel::State to_state = contents_view()->GetStateForPageIndex(to_page);
+
+  gfx::ShadowValue original_shadow = GetSearchBoxShadowForState(from_state);
+  gfx::ShadowValue target_shadow = GetSearchBoxShadowForState(to_state);
+
   SearchBoxView* search_box = contents_view()->GetSearchBoxView();
-  search_box->GetWidget()->SetBounds(contents_view()->ConvertRectToWidget(
-      search_box->GetViewBoundsForSearchBoxContentsBounds(search_box_rect)));
+  gfx::Point offset(gfx::Tween::LinearIntValueBetween(
+                        progress, original_shadow.x(), target_shadow.x()),
+                    gfx::Tween::LinearIntValueBetween(
+                        progress, original_shadow.y(), target_shadow.y()));
+  search_box->SetShadow(gfx::ShadowValue(
+      offset, gfx::Tween::LinearIntValueBetween(
+                  progress, original_shadow.blur(), target_shadow.blur()),
+      gfx::Tween::ColorValueBetween(progress, original_shadow.color(),
+                                    target_shadow.color())));
+
+  search_box->GetWidget()->SetBounds(
+      search_box->GetViewBoundsForSearchBoxContentsBounds(
+          contents_view()->ConvertRectToWidget(search_box_rect)));
 }
 
 void ContentsAnimator::ClipSearchResultsPageToOnscreenBounds(
     int page_index,
     const gfx::Rect& current_bounds,
     const gfx::Rect& onscreen_bounds) {
   int search_results_index =
       contents_view()->GetPageIndexForState(AppListModel::STATE_SEARCH_RESULTS);
   if (page_index != search_results_index)
     return;
@@ skipping 89 matching lines @@
   gfx::Rect custom_page_rect(gfx::Tween::RectValueBetween(
       progress, custom_page_origin, custom_page_on_screen));
 
   contents_view()->GetPageView(start_page)->SetBoundsRect(start_page_rect);
   contents_view()->GetPageView(custom_page)->SetBoundsRect(custom_page_rect);
 
   UpdateSearchBoxForDefaultAnimation(progress, start_page, custom_page);
 }
 
 }  // namespace app_list