Add an option to sort Grooveshark playlist alphabetically. Fixes issue #3480.

Did it the lazy way for now, but it would have better to refactor Grooveshark code, to add a proper sort model, etc.

src/internet/groovesharkservice.cpp

@@ -723,7 +723,7 @@ void GroovesharkService::PlaylistSongsRetrieved(QNetworkReply* reply,
 
   QVariantMap result = ExtractResult(reply);
   SongList songs = ExtractSongs(result);
-  Song::SortSongsListAlphabetically(&songs);
+  SortSongsAlphabeticallyIfNeeded(&songs);
 
   for (const Song& song : songs) {
     QStandardItem* child = CreateSongItem(song);
@@ -764,7 +764,7 @@ void GroovesharkService::UserFavoritesRetrieved(QNetworkReply* reply,
 
   QVariantMap result = ExtractResult(reply);
   SongList songs = ExtractSongs(result);
-  Song::SortSongsListAlphabetically(&songs);
+  SortSongsAlphabeticallyIfNeeded(&songs);
 
   for (const Song& song : songs) {
     QStandardItem* child = CreateSongItem(song);
@@ -798,7 +798,7 @@ void GroovesharkService::UserLibrarySongsRetrieved(QNetworkReply* reply,
 
   QVariantMap result = ExtractResult(reply);
   SongList songs = ExtractSongs(result);
-  Song::SortSongsListAlphabetically(&songs);
+  SortSongsAlphabeticallyIfNeeded(&songs);
 
   for (const Song& song : songs) {
     QStandardItem* child = CreateSongItem(song);
@@ -1704,8 +1704,15 @@ QVariantMap GroovesharkService::ExtractResult(QNetworkReply* reply) {
   return result["result"].toMap();
 }
 
+namespace {
+bool CompareSongs(const QVariant& song1, const QVariant& song2) {
+  return song1.toMap()["Sort"].toInt() < song1.toMap()["Sort"].toInt();
+}
+}
+
 SongList GroovesharkService::ExtractSongs(const QVariantMap& result) {
   QVariantList result_songs = result["songs"].toList();
+  qStableSort(result_songs.begin(), result_songs.end(), CompareSongs);
   SongList songs;
   for (int i = 0; i < result_songs.size(); ++i) {
     QVariantMap result_song = result_songs[i].toMap();
@@ -1805,3 +1812,12 @@ QList<GroovesharkService::PlaylistInfo> GroovesharkService::ExtractPlaylistInfo(
 
   return playlists;
 }
+
+void GroovesharkService::SortSongsAlphabeticallyIfNeeded(SongList* songs) const {
+  QSettings s;
+  s.beginGroup(GroovesharkService::kSettingsGroup);
+  const bool sort_songs_alphabetically = s.value("sort_alphabetically").toBool();
+  if (sort_songs_alphabetically) {
+    Song::SortSongsListAlphabetically(songs);
+  }
+}

src/internet/groovesharkservice.h

@@ -135,6 +135,8 @@ signals:
  public slots:
   void Search(const QString& text, bool now = false);
   void ShowConfig();
+  // Refresh all Grooveshark's items, and re-fill them
+  void RefreshItems();
 
  protected:
   struct PlaylistInfo {
@@ -200,8 +202,6 @@ signals:
   void RequestSslErrors(const QList<QSslError>& errors);
 
   void Homepage();
-  // Refresh all Grooveshark's items, and re-fill them
-  void RefreshItems();
 
  private:
   void EnsureMenuCreated();
@@ -248,6 +248,10 @@ signals:
 
   void ResetSessionId();
 
+  // Sort songs alphabetically only if the "sort_alphabetically" option has been
+  // checked in the preferences settings.
+  void SortSongsAlphabeticallyIfNeeded(SongList* songs) const;
+
   GroovesharkUrlHandler* url_handler_;
 
   QString pending_search_;

src/internet/groovesharksettingspage.cpp

@@ -70,6 +70,8 @@ void GroovesharkSettingsPage::Load() {
   validated_ = false;
 
   UpdateLoginState();
+
+  ui_->sort_alphabetically->setChecked(s.value("sort_alphabetically").toBool());
 }
 
 void GroovesharkSettingsPage::Save() {
@@ -78,6 +80,12 @@ void GroovesharkSettingsPage::Save() {
 
   s.setValue("username", ui_->username->text());
   s.setValue("sessionid", service_->session_id());
+  const bool old_sort_value = s.value("sort_alphabetically").toBool();
+  const bool new_sort_value = ui_->sort_alphabetically->isChecked();
+  if (old_sort_value != new_sort_value) {
+    s.setValue("sort_alphabetically", new_sort_value);
+    service_->RefreshItems();
+  }
 }
 
 void GroovesharkSettingsPage::LoginFinished(bool success) {

src/internet/groovesharksettingspage.ui

@@ -7,12 +7,15 @@
     <x>0</x>
     <y>0</y>
     <width>480</width>
-    <height>141</height>
+    <height>184</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Grooveshark</string>
   </property>
+  <property name="toolTip">
+   <string>By default, Grooveshark sorts songs on date added</string>
+  </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">
    <item>
     <widget class="LoginStateWidget" name="login_state" native="true"/>
@@ -69,6 +72,32 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <widget class="QGroupBox" name="preferences_group">
+     <property name="title">
+      <string>Preferences</string>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout_3">
+      <item>
+       <layout class="QGridLayout" name="gridLayout_5">
+        <item row="0" column="0">
+         <widget class="QCheckBox" name="sort_alphabetically">
+          <property name="enabled">
+           <bool>true</bool>
+          </property>
+          <property name="text">
+           <string>Sort playlists songs alphabetically</string>
+          </property>
+          <property name="checked">
+           <bool>false</bool>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
    <item>
     <spacer name="verticalSpacer">
      <property name="orientation">