Make SearchResultPageView animation clip to its onscreen bounds.

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"
@@ skipping 82 matching lines @@
       contents_view()->GetSearchBoxBoundsForPageIndex(to_page));
 
   gfx::Rect search_box_rect =
       gfx::Tween::RectValueBetween(progress, search_box_from, search_box_to);
 
   views::View* search_box = contents_view()->GetSearchBoxView();
   search_box->GetWidget()->SetBounds(
       contents_view()->ConvertRectToWidget(search_box_rect));
 }
 
+void ContentsAnimator::ClipPageToOnscreenBounds(
+    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;
+
+  contents_view()
+      ->GetPageView(page_index)
+      ->set_clip_insets(current_bounds.InsetsFrom(onscreen_bounds));
+}
+
 // DefaultAnimator
 
 DefaultAnimator::DefaultAnimator(ContentsView* contents_view)
     : ContentsAnimator(contents_view) {
 }
 
 std::string DefaultAnimator::NameForTests() const {
   return "DefaultAnimator";
 }
 
 void DefaultAnimator::Update(double progress, int from_page, int to_page) {
   // Move the from page from 0 to its origin. Move the to page from its origin
   // to 0.
   gfx::Rect from_page_onscreen(GetOnscreenPageBounds(from_page));
   gfx::Rect to_page_onscreen(GetOnscreenPageBounds(to_page));
   gfx::Rect from_page_origin(GetOffscreenPageBounds(from_page));
   gfx::Rect to_page_origin(GetOffscreenPageBounds(to_page));
   gfx::Rect from_page_rect(gfx::Tween::RectValueBetween(
       progress, from_page_onscreen, from_page_origin));
   gfx::Rect to_page_rect(
       gfx::Tween::RectValueBetween(progress, to_page_origin, to_page_onscreen));
 
   contents_view()->GetPageView(from_page)->SetBoundsRect(from_page_rect);
+  ClipPageToOnscreenBounds(from_page, from_page_rect, from_page_onscreen);
+
   contents_view()->GetPageView(to_page)->SetBoundsRect(to_page_rect);
+  ClipPageToOnscreenBounds(to_page, to_page_rect, to_page_onscreen);
 
   UpdateCustomPageForDefaultAnimation(progress, from_page, to_page);
   UpdateSearchBoxForDefaultAnimation(progress, from_page, to_page);
 }
 
 // StartToAppsAnimator
 
 StartToAppsAnimator::StartToAppsAnimator(ContentsView* contents_view)
     : ContentsAnimator(contents_view) {
 }
@@ skipping 44 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