chrome/browser/custom_home_pages_table_model.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 "chrome/browser/custom_home_pages_table_model.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/i18n/rtl.h"
  10 #include "base/prefs/pref_service.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "chrome/browser/history/history_service.h"
  13 #include "chrome/browser/history/history_service_factory.h"
  14 #include "chrome/browser/profiles/profile.h"
  15 #include "chrome/browser/ui/browser.h"
  16 #include "chrome/browser/ui/browser_iterator.h"
  17 #include "chrome/browser/ui/browser_list.h"
  18 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  19 #include "chrome/common/pref_names.h"
  20 #include "chrome/common/url_constants.h"
  21 #include "chrome/grit/generated_resources.h"
  22 #include "content/public/browser/web_contents.h"
  23 #include "net/base/net_util.h"
  24 #include "ui/base/l10n/l10n_util.h"
  25 #include "ui/base/models/table_model_observer.h"
  26 #include "ui/gfx/codec/png_codec.h"
  27 #include "url/gurl.h"
  28
  29 namespace {
  30
  31 // Checks whether the given URL should count as one of the "current" pages.
  32 // Returns true for all pages except dev tools and settings.
  33 bool ShouldAddPage(const GURL& url) {
  34   if (url.is_empty())
  35     return false;
  36
  37   if (url.SchemeIs(content::kChromeDevToolsScheme))
  38     return false;
  39
  40   if (url.SchemeIs(content::kChromeUIScheme)) {
  41     if (url.host() == chrome::kChromeUISettingsHost)
  42       return false;
  43
  44     // For a settings page, the path will start with "/settings" not "settings"
  45     // so find() will return 1, not 0.
  46     if (url.host() == chrome::kChromeUIUberHost &&
  47         url.path().find(chrome::kChromeUISettingsHost) == 1) {
  48       return false;
  49     }
  50   }
  51
  52   return true;
  53 }
  54
  55 }  // namespace
  56
  57 struct CustomHomePagesTableModel::Entry {
  58   Entry() : task_id(base::CancelableTaskTracker::kBadTaskId) {}
  59
  60   // URL of the page.
  61   GURL url;
  62
  63   // Page title.  If this is empty, we'll display the URL as the entry.
  64   base::string16 title;
  65
  66   // If not |base::CancelableTaskTracker::kBadTaskId|, indicates we're loading
  67   // the title for the page.
  68   base::CancelableTaskTracker::TaskId task_id;
  69 };
  70
  71 CustomHomePagesTableModel::CustomHomePagesTableModel(Profile* profile)
  72     : profile_(profile),
  73       observer_(NULL),
  74       num_outstanding_title_lookups_(0) {
  75 }
  76
  77 CustomHomePagesTableModel::~CustomHomePagesTableModel() {
  78 }
  79
  80 void CustomHomePagesTableModel::SetURLs(const std::vector<GURL>& urls) {
  81   entries_.resize(urls.size());
  82   for (size_t i = 0; i < urls.size(); ++i) {
  83     entries_[i].url = urls[i];
  84     entries_[i].title.erase();
  85   }
  86   LoadAllTitles();
  87 }
  88
  89 /**
  90  * Move a number of existing entries to a new position, reordering the table.
  91  *
  92  * We determine the range of elements affected by the move, save the moved
  93  * elements, compact the remaining ones, and re-insert moved elements.
  94  * Expects |index_list| to be ordered ascending.
  95  */
  96 void CustomHomePagesTableModel::MoveURLs(int insert_before,
  97                                          const std::vector<int>& index_list) {
  98   if (index_list.empty()) return;
  99   DCHECK(insert_before >= 0 && insert_before <= RowCount());
 100
 101   // The range of elements that needs to be reshuffled is [ |first|, |last| ).
 102   int first = std::min(insert_before, index_list.front());
 103   int last = std::max(insert_before, index_list.back() + 1);
 104
 105   // Save the dragged elements. Also, adjust insertion point if it is before a
 106   // dragged element.
 107   std::vector<Entry> moved_entries;
 108   for (size_t i = 0; i < index_list.size(); ++i) {
 109     moved_entries.push_back(entries_[index_list[i]]);
 110     if (index_list[i] == insert_before)
 111       insert_before++;
 112   }
 113
 114   // Compact the range between beginning and insertion point, moving downwards.
 115   size_t skip_count = 0;
 116   for (int i = first; i < insert_before; ++i) {
 117     if (skip_count < index_list.size() && index_list[skip_count] == i)
 118       skip_count++;
 119     else
 120       entries_[i - skip_count] = entries_[i];
 121   }
 122
 123   // Moving items down created a gap. We start compacting up after it.
 124   first = insert_before;
 125   insert_before -= skip_count;
 126
 127   // Now compact up for elements after the insertion point.
 128   skip_count = 0;
 129   for (int i = last - 1; i >= first; --i) {
 130     if (skip_count < index_list.size() &&
 131         index_list[index_list.size() - skip_count - 1] == i) {
 132       skip_count++;
 133     } else {
 134       entries_[i + skip_count] = entries_[i];
 135     }
 136   }
 137
 138   // Insert moved elements.
 139   std::copy(moved_entries.begin(), moved_entries.end(),
 140       entries_.begin() + insert_before);
 141
 142   // Possibly large change, so tell the view to just rebuild itself.
 143   if (observer_)
 144     observer_->OnModelChanged();
 145 }
 146
 147 void CustomHomePagesTableModel::AddWithoutNotification(
 148     int index, const GURL& url) {
 149   DCHECK(index >= 0 && index <= RowCount());
 150   entries_.insert(entries_.begin() + static_cast<size_t>(index), Entry());
 151   entries_[index].url = url;
 152 }
 153
 154 void CustomHomePagesTableModel::Add(int index, const GURL& url) {
 155   AddWithoutNotification(index, url);
 156   LoadTitle(&(entries_[index]));
 157   if (observer_)
 158     observer_->OnItemsAdded(index, 1);
 159 }
 160
 161 void CustomHomePagesTableModel::RemoveWithoutNotification(int index) {
 162   DCHECK(index >= 0 && index < RowCount());
 163   Entry* entry = &(entries_[index]);
 164   // Cancel any pending load requests now so we don't deref a bogus pointer when
 165   // we get the loaded notification.
 166   if (entry->task_id != base::CancelableTaskTracker::kBadTaskId) {
 167     task_tracker_.TryCancel(entry->task_id);
 168     entry->task_id = base::CancelableTaskTracker::kBadTaskId;
 169   }
 170   entries_.erase(entries_.begin() + static_cast<size_t>(index));
 171 }
 172
 173 void CustomHomePagesTableModel::Remove(int index) {
 174   RemoveWithoutNotification(index);
 175   if (observer_)
 176     observer_->OnItemsRemoved(index, 1);
 177 }
 178
 179 void CustomHomePagesTableModel::SetToCurrentlyOpenPages() {
 180   // Remove the current entries.
 181   while (RowCount())
 182     RemoveWithoutNotification(0);
 183
 184   // And add all tabs for all open browsers with our profile.
 185   int add_index = 0;
 186   for (chrome::BrowserIterator it; !it.done(); it.Next()) {
 187     Browser* browser = *it;
 188     if (browser->profile() != profile_)
 189       continue;  // Skip incognito browsers.
 190
 191     for (int tab_index = 0;
 192          tab_index < browser->tab_strip_model()->count();
 193          ++tab_index) {
 194       const GURL url =
 195           browser->tab_strip_model()->GetWebContentsAt(tab_index)->GetURL();
 196       if (ShouldAddPage(url))
 197         AddWithoutNotification(add_index++, url);
 198     }
 199   }
 200   LoadAllTitles();
 201 }
 202
 203 std::vector<GURL> CustomHomePagesTableModel::GetURLs() {
 204   std::vector<GURL> urls(entries_.size());
 205   for (size_t i = 0; i < entries_.size(); ++i)
 206     urls[i] = entries_[i].url;
 207   return urls;
 208 }
 209
 210 int CustomHomePagesTableModel::RowCount() {
 211   return static_cast<int>(entries_.size());
 212 }
 213
 214 base::string16 CustomHomePagesTableModel::GetText(int row, int column_id) {
 215   DCHECK(column_id == 0);
 216   DCHECK(row >= 0 && row < RowCount());
 217   return entries_[row].title.empty() ? FormattedURL(row) : entries_[row].title;
 218 }
 219
 220 base::string16 CustomHomePagesTableModel::GetTooltip(int row) {
 221   return entries_[row].title.empty() ? base::string16() :
 222       l10n_util::GetStringFUTF16(IDS_OPTIONS_STARTUP_PAGE_TOOLTIP,
 223                                  entries_[row].title, FormattedURL(row));
 224 }
 225
 226 void CustomHomePagesTableModel::SetObserver(ui::TableModelObserver* observer) {
 227   observer_ = observer;
 228 }
 229
 230 void CustomHomePagesTableModel::LoadTitle(Entry* entry) {
 231   HistoryService* history_service = HistoryServiceFactory::GetForProfile(
 232       profile_, ServiceAccessType::EXPLICIT_ACCESS);
 233   if (history_service) {
 234     entry->task_id = history_service->QueryURL(
 235         entry->url,
 236         false,
 237         base::Bind(&CustomHomePagesTableModel::OnGotTitle,
 238                    base::Unretained(this),
 239                    entry->url,
 240                    false),
 241         &task_tracker_);
 242   }
 243 }
 244
 245 void CustomHomePagesTableModel::LoadAllTitles() {
 246   HistoryService* history_service = HistoryServiceFactory::GetForProfile(
 247       profile_, ServiceAccessType::EXPLICIT_ACCESS);
 248   // It's possible for multiple LoadAllTitles() queries to be inflight we want
 249   // to make sure everything is resolved before updating the observer or we risk
 250   // getting rendering glitches.
 251   num_outstanding_title_lookups_ += entries_.size();
 252   for (Entry& entry : entries_) {
 253     if (history_service) {
 254       entry.task_id = history_service->QueryURL(
 255           entry.url,
 256           false,
 257           base::Bind(&CustomHomePagesTableModel::OnGotOneOfManyTitles,
 258                      base::Unretained(this),
 259                      entry.url),
 260           &task_tracker_);
 261     }
 262   }
 263   if (entries_.empty())
 264     observer_->OnModelChanged();
 265 }
 266
 267 void CustomHomePagesTableModel::OnGotOneOfManyTitles(const GURL& entry_url,
 268                                            bool found_url,
 269                                            const history::URLRow& row,
 270                                            const history::VisitVector& visits) {
 271   OnGotTitle(entry_url, false, found_url, row, visits);
 272   DCHECK_GE(num_outstanding_title_lookups_, 1);
 273   if (--num_outstanding_title_lookups_ == 0 && observer_)
 274     observer_->OnModelChanged();
 275 }
 276
 277 void CustomHomePagesTableModel::OnGotTitle(const GURL& entry_url,
 278                                            bool observable,
 279                                            bool found_url,
 280                                            const history::URLRow& row,
 281                                            const history::VisitVector& visits) {
 282   Entry* entry = NULL;
 283   size_t entry_index = 0;
 284   for (size_t i = 0; i < entries_.size(); ++i) {
 285     if (entries_[i].url == entry_url) {
 286       entry = &entries_[i];
 287       entry_index = i;
 288       break;
 289     }
 290   }
 291   if (!entry) {
 292     // The URLs changed before we were called back.
 293     return;
 294   }
 295   entry->task_id = base::CancelableTaskTracker::kBadTaskId;
 296   if (found_url && !row.title().empty()) {
 297     entry->title = row.title();
 298     if (observer_ && observable)
 299       observer_->OnItemsChanged(static_cast<int>(entry_index), 1);
 300   }
 301 }
 302
 303 base::string16 CustomHomePagesTableModel::FormattedURL(int row) const {
 304   std::string languages =
 305       profile_->GetPrefs()->GetString(prefs::kAcceptLanguages);
 306   base::string16 url = net::FormatUrl(entries_[row].url, languages);
 307   url = base::i18n::GetDisplayStringInLTRDirectionality(url);
 308   return url;
 309 }