src/ui/app_list/views/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/views/search_result_list_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "ui/app_list/views/search_result_list_view_delegate.h"
  12 #include "ui/app_list/views/search_result_view.h"
  13 #include "ui/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       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_TAB:
  79       if (event.IsShiftDown())
  80         SetSelectedIndex(std::max(selected_index_ - 1, 0));
  81       else
  82         SetSelectedIndex(std::min(selected_index_ + 1, last_visible_index_));
  83       return true;
  84     case ui::VKEY_UP:
  85       SetSelectedIndex(std::max(selected_index_ - 1, 0));
  86       return true;
  87     case ui::VKEY_DOWN:
  88       SetSelectedIndex(std::min(selected_index_ + 1, last_visible_index_));
  89       return true;
  90     case ui::VKEY_RETURN:
  91       if (selected_index_ >= 0)
  92         SearchResultActivated(GetResultViewAt(selected_index_), event.flags());
  93       return true;
  94     default:
  95       break;
  96   }
  97   return false;
  98 }
  99
 100 SearchResultView* SearchResultListView::GetResultViewAt(int index) {
 101   DCHECK(index >= 0 && index < child_count());
 102   return static_cast<SearchResultView*>(child_at(index));
 103 }
 104
 105 void SearchResultListView::Update() {
 106   last_visible_index_ = 0;
 107   for (size_t i = 0; i < static_cast<size_t>(child_count()); ++i) {
 108     SearchResultView* result_view = GetResultViewAt(i);
 109     if (i < results_->item_count()) {
 110       result_view->SetResult(results_->GetItemAt(i));
 111       result_view->SetVisible(true);
 112       last_visible_index_ = i;
 113     } else {
 114       result_view->SetResult(NULL);
 115       result_view->SetVisible(false);
 116     }
 117   }
 118   if (selected_index_ > last_visible_index_)
 119     SetSelectedIndex(last_visible_index_);
 120
 121   Layout();
 122   update_factory_.InvalidateWeakPtrs();
 123 }
 124
 125 void SearchResultListView::ScheduleUpdate() {
 126   // When search results are added one by one, each addition generates an update
 127   // request. Consolidates those update requests into one Update call.
 128   if (!update_factory_.HasWeakPtrs()) {
 129     base::MessageLoop::current()->PostTask(
 130         FROM_HERE,
 131         base::Bind(&SearchResultListView::Update,
 132                    update_factory_.GetWeakPtr()));
 133   }
 134 }
 135
 136 void SearchResultListView::ListItemsAdded(size_t start, size_t count) {
 137   ScheduleUpdate();
 138 }
 139
 140 void SearchResultListView::ListItemsRemoved(size_t start, size_t count) {
 141   size_t last = std::min(start + count, static_cast<size_t>(child_count()));
 142   for (size_t i = start; i < last; ++i)
 143     GetResultViewAt(i)->ClearResultNoRepaint();
 144
 145   ScheduleUpdate();
 146 }
 147
 148 void SearchResultListView::ListItemMoved(size_t index, size_t target_index) {
 149   NOTREACHED();
 150 }
 151
 152 void SearchResultListView::ListItemsChanged(size_t start, size_t count) {
 153   ScheduleUpdate();
 154 }
 155
 156 void SearchResultListView::SearchResultActivated(SearchResultView* view,
 157                                                  int event_flags) {
 158   if (delegate_ && view->result())
 159     delegate_->OpenResult(view->result(), event_flags);
 160 }
 161
 162 void SearchResultListView::SearchResultActionActivated(SearchResultView* view,
 163                                                        size_t action_index,
 164                                                        int event_flags) {
 165   if (delegate_ && view->result()) {
 166     delegate_->InvokeResultAction(
 167         view->result(), action_index, event_flags);
 168   }
 169 }
 170
 171 void SearchResultListView::OnSearchResultInstalled(SearchResultView* view) {
 172   if (delegate_ && view->result())
 173     delegate_->OnResultInstalled(view->result());
 174 }
 175
 176 void SearchResultListView::OnSearchResultUninstalled(SearchResultView* view) {
 177   if (delegate_ && view->result())
 178     delegate_->OnResultUninstalled(view->result());
 179 }
 180
 181 }  // namespace app_list