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