ui/app_list/search_result_list_view.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/app_list/search_result_list_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/message_loop.h"
  11 #include "ui/app_list/search_result_list_view_delegate.h"
  12 #include "ui/app_list/search_result_view.h"
  13 #include "ui/base/events/event.h"
  14 #include "ui/views/layout/box_layout.h"
  15
  16 namespace {
  17
  18 const int kMaxResults = 6;
  19
  20 }  // namespace
  21
  22 namespace app_list {
  23
  24 SearchResultListView::SearchResultListView(
  25     SearchResultListViewDelegate* delegate)
  26     : delegate_(delegate),
  27       results_(NULL),
  28       last_visible_index_(0),
  29       selected_index_(-1),
  30       ALLOW_THIS_IN_INITIALIZER_LIST(update_factory_(this)) {
  31   SetLayoutManager(
  32       new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
  33
  34   for (int i = 0; i < kMaxResults; ++i)
  35     AddChildView(new SearchResultView(this, this));
  36 }
  37
  38 SearchResultListView::~SearchResultListView() {
  39   if (results_)
  40     results_->RemoveObserver(this);
  41 }
  42
  43 void SearchResultListView::SetResults(AppListModel::SearchResults* results) {
  44   if (results_)
  45     results_->RemoveObserver(this);
  46
  47   results_ = results;
  48   if (results_)
  49     results_->AddObserver(this);
  50
  51   Update();
  52 }
  53
  54 void SearchResultListView::SetSelectedIndex(int selected_index) {
  55   if (selected_index_ == selected_index)
  56     return;
  57
  58   if (selected_index_ >= 0)
  59     GetResultViewAt(selected_index_)->SchedulePaint();
  60
  61   selected_index_ = selected_index;
  62
  63   if (selected_index_ >= 0)
  64     GetResultViewAt(selected_index_)->SchedulePaint();
  65 }
  66
  67 bool SearchResultListView::IsResultViewSelected(
  68     const SearchResultView* result_view) const {
  69   if (selected_index_ < 0)
  70     return false;
  71
  72   return static_cast<const SearchResultView*>(child_at(selected_index_)) ==
  73       result_view;
  74 }
  75
  76 bool SearchResultListView::OnKeyPressed(const ui::KeyEvent& event) {
  77   switch (event.key_code()) {
  78     case ui::VKEY_UP:
  79       SetSelectedIndex(std::max(selected_index_ - 1, 0));
  80       return true;
  81     case ui::VKEY_DOWN:
  82       SetSelectedIndex(std::min(selected_index_ + 1, last_visible_index_));
  83       return true;
  84     case ui::VKEY_RETURN:
  85       if (selected_index_ >= 0)
  86         SearchResultActivated(GetResultViewAt(selected_index_), event);
  87       return true;
  88     default:
  89       break;
  90   }
  91   return false;
  92 }
  93
  94 SearchResultView* SearchResultListView::GetResultViewAt(int index) {
  95   DCHECK(index >= 0 && index < child_count());
  96   return static_cast<SearchResultView*>(child_at(index));
  97 }
  98
  99 void SearchResultListView::Update() {
 100   last_visible_index_ = 0;
 101   for (size_t i = 0; i < static_cast<size_t>(child_count()); ++i) {
 102     SearchResultView* result_view = GetResultViewAt(i);
 103     if (i < results_->item_count()) {
 104       result_view->SetResult(results_->GetItemAt(i));
 105       result_view->SetVisible(true);
 106       last_visible_index_ = i;
 107     } else {
 108       result_view->SetResult(NULL);
 109       result_view->SetVisible(false);
 110     }
 111   }
 112   if (selected_index_ > last_visible_index_)
 113     SetSelectedIndex(last_visible_index_);
 114
 115   Layout();
 116   update_factory_.InvalidateWeakPtrs();
 117 }
 118
 119 void SearchResultListView::ScheduleUpdate() {
 120   // When search results are added one by one, each addition generates an update
 121   // request. Consolidates those update requests into one Update call.
 122   if (!update_factory_.HasWeakPtrs()) {
 123     MessageLoop::current()->PostTask(
 124         FROM_HERE,
 125         base::Bind(&SearchResultListView::Update,
 126                    update_factory_.GetWeakPtr()));
 127   }
 128 }
 129
 130 void SearchResultListView::ListItemsAdded(size_t start, size_t count) {
 131   ScheduleUpdate();
 132 }
 133
 134 void SearchResultListView::ListItemsRemoved(size_t start, size_t count) {
 135   size_t last = std::min(start + count, static_cast<size_t>(child_count()));
 136   for (size_t i = start; i < last; ++i)
 137     GetResultViewAt(i)->ClearResultNoRepaint();
 138
 139   ScheduleUpdate();
 140 }
 141
 142 void SearchResultListView::ListItemMoved(size_t index, size_t target_index) {
 143   NOTREACHED();
 144 }
 145
 146 void SearchResultListView::ListItemsChanged(size_t start, size_t count) {
 147   ScheduleUpdate();
 148 }
 149
 150 void SearchResultListView::SearchResultActivated(SearchResultView* view,
 151                                                  const ui::Event& event) {
 152   if (delegate_ && view->result())
 153     delegate_->OpenResult(*(view->result()), event.flags());
 154 }
 155
 156 void SearchResultListView::SearchResultActionActivated(SearchResultView* view,
 157                                                        int action_index,
 158                                                        const ui::Event& event) {
 159   if (delegate_ && view->result()) {
 160     delegate_->InvokeResultAction(
 161         *(view->result()), action_index, event.flags());
 162   }
 163 }
 164
 165 }  // namespace app_list