app_list: Add search box and search result view for v2.

ui/app_list/search_result_list_view.cc

+// Copyright (c) 2012 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/search_result_list_view.h"
+
+#include <algorithm>
+
+#include "base/bind.h"
+#include "base/message_loop.h"
+#include "ui/app_list/search_result_view.h"
+#include "ui/app_list/search_result_list_view_delegate.h"
+#include "ui/app_list/view_ids.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace {
+
+const int kMaxResults = 6;
+
+}  // namespace
+
+namespace app_list {
+
+SearchResultListView::SearchResultListView(
+    SearchResultListViewDelegate* delegate)
+    : delegate_(delegate),
+      results_(NULL),
+      last_visible_index_(0),
+      selected_index_(-1),
+      ALLOW_THIS_IN_INITIALIZER_LIST(update_factory_(this)) {
+  set_id(VIEW_ID_SEARCH_RESULTS);
+
+  SetLayoutManager(
+      new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
+
+  for (int i = 0; i < kMaxResults; ++i)
+    AddChildView(new SearchResultView(this));

[sky, 2012/05/22 22:16:06]

What happens if you there isn't enough space to fit these vertically?

[xiyuan, 2012/05/23 21:25:22]

Hosting AppListView is updated to leave enough vertical space for this. In its
Layout, we keep the max height of grid + page switcher and results now.

+}
+
+SearchResultListView::~SearchResultListView() {
+  if (results_)
+    results_->RemoveObserver(this);
+}
+
+void SearchResultListView::SetResults(AppListModel::SearchResults* results) {
+  if (results_)
+    results_->RemoveObserver(this);
+
+  results_ = results;
+  if (results_)
+    results_->AddObserver(this);
+
+  Update();
+}
+
+void SearchResultListView::SetSelectedIndex(int selected_index) {
+  if (selected_index_ == selected_index)
+    return;
+
+  if (selected_index_ >= 0)
+    GetResultViewAt(selected_index_)->SetSelected(false);
+
+  selected_index_ = selected_index;
+
+  if (selected_index_ >= 0)
+    GetResultViewAt(selected_index_)->SetSelected(true);
+}
+
+SearchResultView* SearchResultListView::GetResultViewAt(int index) {
+  DCHECK(index >= 0 && index < child_count());
+  return static_cast<SearchResultView*>(child_at(index));
+}
+
+void SearchResultListView::Update() {
+  last_visible_index_ = 0;
+  for (size_t i = 0; i < static_cast<size_t>(child_count()); ++i) {
+    SearchResultView* result_view = GetResultViewAt(i);
+    if (i < results_->item_count()) {
+      result_view->SetResult(results_->GetItemAt(i));
+      result_view->SetVisible(true);
+      last_visible_index_ = i;
+    } else {
+      result_view->SetResult(NULL);
+      result_view->SetVisible(false);
+    }
+  }
+  if (selected_index_ > last_visible_index_)
+    SetSelectedIndex(last_visible_index_);
+
+  Layout();
+  update_factory_.InvalidateWeakPtrs();
+}
+
+void SearchResultListView::ScheduleUpdate() {
+  if (!update_factory_.HasWeakPtrs()) {

[sky, 2012/05/22 22:16:06]

Document why this is throttled.

[xiyuan, 2012/05/23 21:25:22]

Done.

+    MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&SearchResultListView::Update,
+                   update_factory_.GetWeakPtr()));
+  }
+}
+
+gfx::Size SearchResultListView::GetPreferredSize() {
+  if (!parent())
+    return gfx::Size();
+
+  // Result list occupies the same place as grid view + page switcher.

[sky, 2012/05/22 22:16:06]

I don't understand this. The preferred size shouldn't vary depending upon
current size. Also, I don't like looking up views by id. Too brittle.

[xiyuan, 2012/05/23 21:25:22]

Removed and explicitly layout those views in parent AppListView.

Also replaced view id related code with explicitly set view in SearchBoxView and
AppListBubbleBorder.

+  gfx::Rect rect(parent()->GetViewByID(VIEW_ID_APPS_GRID)->bounds());
+  rect = rect.Union(parent()->GetViewByID(VIEW_ID_PAGE_SWITCHER)->bounds());
+  return rect.size();
+}
+
+bool SearchResultListView::OnKeyPressed(const views::KeyEvent& event) {
+  switch (event.key_code()) {
+    case ui::VKEY_UP:
+      SetSelectedIndex(std::max(selected_index_ - 1, 0));
+      return true;
+    case ui::VKEY_DOWN:
+      SetSelectedIndex(std::min(selected_index_ + 1, last_visible_index_));
+      return true;
+    case ui::VKEY_RETURN:
+      if (selected_index_ >= 0)
+        ButtonPressed(GetResultViewAt(selected_index_), event);
+      return true;
+    default:
+      break;
+  }
+  return false;
+}
+
+void SearchResultListView::ButtonPressed(views::Button* sender,
+                                         const views::Event& event) {
+  if (sender->GetClassName() != SearchResultView::kViewClassName)
+    return;
+
+  if (delegate_) {
+    delegate_->OpenResult(static_cast<SearchResultView*>(sender)->result(),
+                          event.flags());
+  }
+}
+
+void SearchResultListView::ListItemsAdded(size_t start, size_t count) {
+  ScheduleUpdate();
+}
+
+void SearchResultListView::ListItemsRemoved(size_t start, size_t count) {
+  ScheduleUpdate();
+}
+
+void SearchResultListView::ListItemsChanged(size_t start, size_t count) {
+  ScheduleUpdate();
+}
+
+}  // namespace app_list