ui/app_list/views/search_result_container_view.cc

   1 // Copyright (c) 2014 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_container_view.h"
   6
   7 #include "base/bind.h"
   8 #include "base/message_loop/message_loop.h"
   9
  10 namespace app_list {
  11
  12 SearchResultContainerView::SearchResultContainerView()
  13     : delegate_(nullptr),
  14       selected_index_(-1),
  15       num_results_(0),
  16       results_(NULL),
  17       update_factory_(this) {
  18 }
  19
  20 SearchResultContainerView::~SearchResultContainerView() {
  21   if (results_)
  22     results_->RemoveObserver(this);
  23 }
  24
  25 void SearchResultContainerView::SetResults(
  26     AppListModel::SearchResults* results) {
  27   if (results_)
  28     results_->RemoveObserver(this);
  29
  30   results_ = results;
  31   if (results_)
  32     results_->AddObserver(this);
  33
  34   DoUpdate();
  35 }
  36
  37 void SearchResultContainerView::SetSelectedIndex(int selected_index) {
  38   DCHECK(IsValidSelectionIndex(selected_index));
  39   int old_selected = selected_index_;
  40   selected_index_ = selected_index;
  41   UpdateSelectedIndex(old_selected, selected_index_);
  42 }
  43
  44 void SearchResultContainerView::ClearSelectedIndex() {
  45   int old_selected = selected_index_;
  46   selected_index_ = -1;
  47   UpdateSelectedIndex(old_selected, selected_index_);
  48 }
  49
  50 bool SearchResultContainerView::IsValidSelectionIndex(int index) const {
  51   return index >= 0 && index <= num_results() - 1;
  52 }
  53
  54 void SearchResultContainerView::ScheduleUpdate() {
  55   // When search results are added one by one, each addition generates an update
  56   // request. Consolidates those update requests into one Update call.
  57   if (!update_factory_.HasWeakPtrs()) {
  58     base::MessageLoop::current()->PostTask(
  59         FROM_HERE,
  60         base::Bind(&SearchResultContainerView::DoUpdate,
  61                    update_factory_.GetWeakPtr()));
  62   }
  63 }
  64
  65 bool SearchResultContainerView::UpdateScheduled() {
  66   return update_factory_.HasWeakPtrs();
  67 }
  68
  69 void SearchResultContainerView::ListItemsAdded(size_t start, size_t count) {
  70   ScheduleUpdate();
  71 }
  72
  73 void SearchResultContainerView::ListItemsRemoved(size_t start, size_t count) {
  74   ScheduleUpdate();
  75 }
  76
  77 void SearchResultContainerView::ListItemMoved(size_t index,
  78                                               size_t target_index) {
  79   ScheduleUpdate();
  80 }
  81
  82 void SearchResultContainerView::ListItemsChanged(size_t start, size_t count) {
  83   ScheduleUpdate();
  84 }
  85
  86 void SearchResultContainerView::DoUpdate() {
  87   update_factory_.InvalidateWeakPtrs();
  88   num_results_ = Update();
  89   Layout();
  90   if (delegate_)
  91     delegate_->OnSearchResultContainerResultsChanged();
  92 }
  93
  94 }  // namespace app_list