[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_groups_view.cc

+// Copyright (c) 2011 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/aura_shell/app_list/app_list_groups_view.h"
+
+#include "base/utf_string_conversions.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/aura_shell/app_list/app_list_item_group_model.h"
+#include "ui/aura_shell/app_list/app_list_item_group_view.h"
+#include "ui/aura_shell/app_list/app_list_item_view.h"
+#include "ui/aura_shell/app_list/app_list_model.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/views/animation/bounds_animator.h"
+#include "ui/views/controls/button/text_button.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace aura_shell {
+
+namespace {
+
+const SkColor kPageHeaderColor = SkColorSetARGB(0xFF, 0xB2, 0xB2, 0xB2);
+const SkColor kSelectedPageHeaderColor = SK_ColorWHITE;
+
+// Creates page headers view that hosts page title buttons.
+views::View* CreatePageHeader() {
+  views::View* header = new views::View;
+  header->SetLayoutManager(
+      new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 0, 0));
+  return header;
+}
+
+// Creates page header button view that shows page title.
+views::View* CreatePageHeaderButton(views::ButtonListener* listener,
+                                    const std::string& title ) {
+  views::TextButton* button = new views::TextButton(listener,
+        UTF8ToUTF16(title));
+
+  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+  button->SetFont(rb.GetFont(ResourceBundle::BaseFont).DeriveFont(
+      2, gfx::Font::BOLD));
+  button->SetEnabledColor(kPageHeaderColor);
+  return button;
+}
+
+// Gets preferred bounds of buttons and page.
+void GetPageAndHeaderBounds(views::View* parent,
+                            views::View* buttons,
+                            views::View* page,
+                            gfx::Rect* buttons_bounds,
+                            gfx::Rect* page_bounds) {
+  gfx::Rect content_bounds = parent->GetContentsBounds();
+
+  if (buttons) {
+    gfx::Size buttons_size = buttons->GetPreferredSize();
+    if (buttons_bounds) {
+      buttons_bounds->SetRect(
+          (content_bounds.width() - buttons_size.width()) / 2,
+          content_bounds.bottom() - buttons_size.height(),
+          buttons_size.width(), buttons_size.height());
+    }
+
+    content_bounds.set_height(
+        std::max(0, content_bounds.height() - buttons_size.height()));
+  }
+
+  if (page_bounds) {
+    gfx::Size page_size = page->GetPreferredSize();
+    *page_bounds = content_bounds.Center(page_size);
+  }
+}
+
+}  // namespace
+
+AppListGroupsView::AppListGroupsView(AppListModel* model,
+                                     AppListItemViewListener* listener)
+    : model_(model),
+      listener_(listener),
+      page_buttons_(NULL),
+      current_page_(0) {
+  animator_.reset(new views::BoundsAnimator(this));
+  model_->AddObserver(this);
+  Update();
+}
+
+AppListGroupsView::~AppListGroupsView() {
+  model_->RemoveObserver(this);
+}
+
+views::View* AppListGroupsView::GetFocusedTile() const {
+  AppListItemGroupView* page = GetCurrentPageView();
+  return page ? page->GetFocusedTile() : NULL;
+}
+
+void AppListGroupsView::Update() {
+  current_page_ = 0;
+  page_buttons_ = NULL;
+  RemoveAllChildViews(true);
+
+  int page_count = model_->group_count();
+  if (!page_count)
+    return;
+
+  if (page_count > 1)
+    AddChildView(page_buttons_ = CreatePageHeader());
+
+  for (int i = 0; i < page_count; ++i) {
+    AppListItemGroupModel* group = model_->GetGroup(i);
+    AddPage(group->title(), new AppListItemGroupView(group, listener_));
+  }
+
+  if (!size().IsEmpty())
+    Layout();
+  SetCurrentPage(0);
+}
+
+void AppListGroupsView::AddPage(const std::string& title,
+                                AppListItemGroupView* page) {
+  pages_.push_back(page);
+  AddChildView(page);
+
+  if (page_buttons_)
+    page_buttons_->AddChildView(CreatePageHeaderButton(this, title));
+}
+
+int AppListGroupsView::GetPreferredTilesPerRow() const {
+  return std::max(1, width() / AppListItemView::kTileSize);
+}
+
+AppListItemGroupView* AppListGroupsView::GetCurrentPageView() const {
+  return static_cast<size_t>(current_page_) < pages_.size() ?
+      pages_[current_page_] : NULL;
+}
+
+void AppListGroupsView::SetCurrentPage(int page) {
+  int previous_page = current_page_;
+  current_page_ = page;
+
+ // Updates page buttons.
+  if (page_buttons_) {
+    for (int i = 0; i < page_buttons_->child_count(); ++i) {
+      views::TextButton* button = static_cast<views::TextButton*>(
+          page_buttons_->child_at(i));
+
+      button->SetEnabledColor(i == current_page_ ?
+          kSelectedPageHeaderColor : kPageHeaderColor);
+    }
+    page_buttons_->SchedulePaint();
+  }
+
+  // Gets sliding animation direction.
+  int dir = previous_page < current_page_ ? -1 :
+      previous_page > current_page_ ? 1 : 0;
+
+  // Skips animation if no sliding needed or no valid size.
+  if (dir == 0 || size().IsEmpty())
+    return;
+
+  animator_->Cancel();
+
+  // Makes sure new page has correct layout and focus to its focused tile.
+  AppListItemGroupView* current_view = GetCurrentPageView();
+  current_view->SetTilesPerRow(GetPreferredTilesPerRow());
+  views::View* tile = current_view->GetFocusedTile();
+  if (tile)
+    tile->RequestFocus();
+
+  // Prepares current page before animation.
+  gfx::Rect current_page_bounds;
+  GetPageAndHeaderBounds(this, page_buttons_, current_view,
+      NULL, &current_page_bounds);
+  current_page_bounds.Offset(- dir * width(), 0);
+  current_view->SetBoundsRect(current_page_bounds);
+
+  // Schedules animations to slide out previous page and slide in current page.
+  AppListItemGroupView* previous_view = pages_[previous_page];
+  gfx::Rect previous_page_bounds = previous_view->bounds();
+  previous_page_bounds.Offset(dir * width(), 0);
+  animator_->AnimateViewTo(previous_view, previous_page_bounds);
+
+  current_page_bounds.Offset(dir * width(), 0);
+  animator_->AnimateViewTo(current_view, current_page_bounds);
+}
+
+void AppListGroupsView::Layout() {
+  AppListItemGroupView* page = GetCurrentPageView();
+  if (!page)
+    return;
+
+  page->SetTilesPerRow(GetPreferredTilesPerRow());
+
+  gfx::Rect buttons_bounds;
+  gfx::Rect page_bounds;
+  GetPageAndHeaderBounds(this, page_buttons_, page,
+      &buttons_bounds, &page_bounds);
+
+  if (page_buttons_)
+    page_buttons_->SetBoundsRect(buttons_bounds);
+
+  page->SetBoundsRect(page_bounds);
+}
+
+bool AppListGroupsView::OnKeyPressed(const views::KeyEvent& event) {
+  if (event.IsControlDown()) {
+    switch (event.key_code()) {
+      case ui::VKEY_LEFT:
+        if (current_page_ > 0)
+          SetCurrentPage(current_page_ - 1);
+        return true;
+      case ui::VKEY_RIGHT:
+        if (static_cast<size_t>(current_page_ + 1) < pages_.size())
+          SetCurrentPage(current_page_ + 1);
+        return true;
+      default:
+        break;
+    }
+  }
+
+  return false;
+}
+
+void AppListGroupsView::ButtonPressed(views::Button* sender,
+                                      const views::Event& event) {
+  DCHECK(page_buttons_);
+  for (int i = 0; i < page_buttons_->child_count(); ++i) {
+    if (page_buttons_->child_at(i) == sender)
+      SetCurrentPage(i);
+  }
+}
+
+void AppListGroupsView::ListItemsAdded(int start, int count) {
+  Update();
+}
+
+void AppListGroupsView::ListItemsRemoved(int start, int count) {
+  Update();
+}
+
+void AppListGroupsView::ListItemsChanged(int start, int count) {
+  NOTREACHED();
+}
+
+}  // namespace aura_shell