App list uses PaginationModel to transition between pages.

ui/app_list/views/app_list_view_unittest.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/app_list_view.h"
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 60 matching lines @@
   // top level views. Then closes the window.
   void RunDisplayTest();
 
   // Hides and reshows the app list with a folder open, expecting the main grid
   // view to be shown.
   void RunReshowWithOpenFolderTest();
 
   // Tests displaying of the experimental app list and shows the start page.
   void RunStartPageTest();
 
+  // Tests switching rapidly between multiple pages of the launcher.
+  void RunPageSwitchingAnimationTest();
+
   // Tests changing the App List profile.
   void RunProfileChangeTest();
 
   // Tests displaying of the search results.
   void RunSearchResultsTest();
 
   // A standard set of checks on a view, e.g., ensuring it is drawn and visible.
   static void CheckView(views::View* subview);
 
   // Invoked when the Widget is closing, and the view it contains is about to
@@ skipping 218 matching lines @@
     EXPECT_EQ(4u, GetVisibleTileItemViews(start_page_view->tile_views()));
     model->DeleteItem(model->GetItemName(0));
     EXPECT_EQ(3u, GetVisibleTileItemViews(start_page_view->tile_views()));
   } else {
     EXPECT_EQ(NULL, start_page_view);
   }
 
   Close();
 }
 
+void AppListViewTestContext::RunPageSwitchingAnimationTest() {
+  if (test_type_ == EXPERIMENTAL) {
+    Show();
+
+    AppListMainView* main_view = view_->app_list_main_view();
+    // Checks on the main view.
+    EXPECT_NO_FATAL_FAILURE(CheckView(main_view));
+    EXPECT_NO_FATAL_FAILURE(CheckView(main_view->contents_view()));
+
+    ContentsView* contents_view = main_view->contents_view();
+    // Pad the ContentsView with blank pages so we have at least 3 views.
+    while (contents_view->NumLauncherPages() < 3)
+      contents_view->AddBlankPageForTesting();
+
+    contents_view->SetActivePage(0);
+    contents_view->Layout();
+    EXPECT_TRUE(IsViewAtOrigin(contents_view->GetPageView(0)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(1)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(2)));
+
+    // Change pages. View should not have moved without Layout().
+    contents_view->SetActivePage(1);
+    EXPECT_TRUE(IsViewAtOrigin(contents_view->GetPageView(0)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(1)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(2)));
+
+    // Change to a third page. This queues up the second animation behind the
+    // first.
+    contents_view->SetActivePage(2);
+    EXPECT_TRUE(IsViewAtOrigin(contents_view->GetPageView(0)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(1)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(2)));
+
+    // Call Layout(). Should jump to the third page.
+    contents_view->Layout();
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(0)));
+    EXPECT_FALSE(IsViewAtOrigin(contents_view->GetPageView(1)));
+    EXPECT_TRUE(IsViewAtOrigin(contents_view->GetPageView(2)));
+  }
+
+  Close();
+}
+
 void AppListViewTestContext::RunProfileChangeTest() {
   EXPECT_FALSE(view_->GetWidget()->IsVisible());
   EXPECT_EQ(-1, GetPaginationModel()->total_pages());
   delegate_->GetTestModel()->PopulateApps(kInitialItems);
 
   Show();
 
   if (is_landscape())
     EXPECT_EQ(2, GetPaginationModel()->total_pages());
   else
@@ skipping 193 matching lines @@
 
 // Tests that the start page view operates correctly.
 TEST_P(AppListViewTestAura, StartPageTest) {
   EXPECT_NO_FATAL_FAILURE(test_context_->RunStartPageTest());
 }
 
 TEST_P(AppListViewTestDesktop, StartPageTest) {
   EXPECT_NO_FATAL_FAILURE(test_context_->RunStartPageTest());
 }
 
+// Tests that the start page view operates correctly.
+TEST_P(AppListViewTestAura, PageSwitchingAnimationTest) {
+  EXPECT_NO_FATAL_FAILURE(test_context_->RunPageSwitchingAnimationTest());
+}
+
+TEST_P(AppListViewTestDesktop, PageSwitchingAnimationTest) {
+  EXPECT_NO_FATAL_FAILURE(test_context_->RunPageSwitchingAnimationTest());
+}
+
 // Tests that the profile changes operate correctly.
 TEST_P(AppListViewTestAura, ProfileChangeTest) {
   EXPECT_NO_FATAL_FAILURE(test_context_->RunProfileChangeTest());
 }
 
 TEST_P(AppListViewTestDesktop, ProfileChangeTest) {
   EXPECT_NO_FATAL_FAILURE(test_context_->RunProfileChangeTest());
 }
 
 // Tests that the correct views are displayed for showing search results.
 TEST_P(AppListViewTestAura, SearchResultsTest) {
   EXPECT_NO_FATAL_FAILURE(test_context_->RunSearchResultsTest());
 }
 
 TEST_P(AppListViewTestDesktop, SearchResultsTest) {
   EXPECT_NO_FATAL_FAILURE(test_context_->RunSearchResultsTest());
 }
 
 INSTANTIATE_TEST_CASE_P(AppListViewTestAuraInstance,
                         AppListViewTestAura,
                         ::testing::Range<int>(TEST_TYPE_START, TEST_TYPE_END));
 
 INSTANTIATE_TEST_CASE_P(AppListViewTestDesktopInstance,
                         AppListViewTestDesktop,
                         ::testing::Range<int>(TEST_TYPE_START, TEST_TYPE_END));
 
 }  // namespace test
 }  // namespace app_list