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      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/search_result_list_view_delegate.h"
     12 #include "ui/app_list/views/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       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
    182