Add keyboard navigation for start page tiles in experimental app list.

ui/app_list/views/start_page_view.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/start_page_view.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_model.h"
@@ skipping 129 matching lines @@
   Update();
 }
 
 TileItemView* StartPageView::all_apps_button() const {
   return all_apps_button_;
 }
 
 void StartPageView::OnShow() {
   DCHECK(app_list_main_view_->contents_view()->ShouldShowCustomPageClickzone());
   UpdateCustomPageClickzoneVisibility();
+  ClearSelectedIndex();
 }
 
 void StartPageView::OnHide() {
   DCHECK(
       !app_list_main_view_->contents_view()->ShouldShowCustomPageClickzone());
   UpdateCustomPageClickzoneVisibility();
 }
 
 void StartPageView::Layout() {
   gfx::Rect bounds(GetContentsBounds());
   bounds.set_height(instant_container_->GetHeightForWidth(bounds.width()));
   instant_container_->SetBoundsRect(bounds);
 
   // Tiles begin where the instant container ends.
   bounds.set_y(bounds.bottom());
   bounds.set_height(tiles_container_->GetHeightForWidth(bounds.width()));
   tiles_container_->SetBoundsRect(bounds);
 }
 
+bool StartPageView::OnKeyPressed(const ui::KeyEvent& event) {
+  if (selected_index() >= 0 &&
+      tiles_container_->child_at(selected_index())->OnKeyPressed(event))
+    return true;
+
+  int dir = 0;
+  switch (event.key_code()) {
+    case ui::VKEY_LEFT:
+      dir = -1;
+      break;
+    case ui::VKEY_RIGHT:
+      dir = 1;
+      break;
+    case ui::VKEY_DOWN:
+      // Down selects the first tile if nothing is selected.
+      if (!IsValidSelectionIndex(selected_index()))
+        dir = 1;
+      break;
+    case ui::VKEY_TAB:
+      dir = event.IsShiftDown() ? -1 : 1;
+      break;
+    default:
+      break;
+  }
+
+  if (dir == 0)
+    return false;
+
+  if (!IsValidSelectionIndex(selected_index())) {
+    SetSelectedIndex(dir == -1 ? num_results() - 1 : 0);
+    return true;
+  }
+
+  int selection_index = selected_index() + dir;
+  if (IsValidSelectionIndex(selection_index)) {
+    SetSelectedIndex(selection_index);
+    return true;
+  }
+
+  return false;
+}
+
 void StartPageView::OnContainerSelected(bool from_bottom) {
 }
 
 gfx::Rect StartPageView::GetSearchBoxBounds() const {
   return search_box_spacer_view_->bounds();
 }
 
 void StartPageView::UpdateCustomPageClickzoneVisibility() {
   // This can get called before InitWidgets(), so we cannot guarantee that
   // custom_page_clickzone_ will not be null.
@@ skipping 18 matching lines @@
   // Update the tile item results.
   for (size_t i = 0; i < search_result_tile_views_.size(); ++i) {
     SearchResult* item = NULL;
     if (i < display_results.size())
       item = display_results[i];
     search_result_tile_views_[i]->SetSearchResult(item);
   }
 
   tiles_container_->Layout();
   Layout();
-  return display_results.size();
+  // Add 1 to the results size to account for the all apps button.
+  return display_results.size() + 1;
 }
 
 void StartPageView::UpdateSelectedIndex(int old_selected, int new_selected) {
+  if (old_selected >= 0) {
+    tiles_container_->child_at(old_selected)->set_background(nullptr);
+    tiles_container_->child_at(old_selected)->SchedulePaint();
+  }
+
+  if (new_selected >= 0) {
+    tiles_container_->child_at(new_selected)
+        ->set_background(
+            views::Background::CreateSolidBackground(kSelectedColor));
+    tiles_container_->child_at(new_selected)->SchedulePaint();
+  }
 }
 
 }  // namespace app_list