Give the last.fm global search provider a config dialog

src/globalsearch/globalsearchsettingspage.cpp

@@ -184,5 +184,5 @@ void GlobalSearchSettingsPage::CurrentProviderChanged(QTreeWidgetItem* item) {
 
   ui_->up->setEnabled(row != 0);
   ui_->down->setEnabled(row != root->childCount() - 1);
-  ui_->configure->setEnabled(provider->CanShowConfig());
+  ui_->configure->setEnabled(provider->can_show_config());
 }

src/globalsearch/groovesharksearchprovider.cpp

@@ -32,7 +32,7 @@ void GroovesharkSearchProvider::Init(GroovesharkService* service) {
   service_ = service;
   SearchProvider::Init("Grooveshark", "grooveshark",
                        QIcon(":providers/grooveshark.png"),
-                       WantsDelayedQueries | ArtIsProbablyRemote);
+                       WantsDelayedQueries | ArtIsProbablyRemote | CanShowConfig);
 
   connect(service_, SIGNAL(SimpleSearchResults(int, SongList)),
           SLOT(SearchDone(int, SongList)));

src/globalsearch/groovesharksearchprovider.h

@@ -36,7 +36,6 @@ class GroovesharkSearchProvider : public SearchProvider {
   void LoadArtAsync(int id, const Result& result);
   void LoadTracksAsync(int id, const Result& result);
   bool IsLoggedIn();
-  bool CanShowConfig() const { return true; }
   void ShowConfig();
 
  private slots:

src/globalsearch/lastfmsearchprovider.cpp

@@ -23,7 +23,7 @@
 LastFMSearchProvider::LastFMSearchProvider(LastFMService* service, QObject* parent)
   : SimpleSearchProvider(parent),
     service_(service) {
-  Init("Last.fm", "lastfm", QIcon(":last.fm/as.png"));
+  Init("Last.fm", "lastfm", QIcon(":last.fm/as.png"), CanShowConfig);
   icon_ = ScaleAndPad(QImage(":last.fm/as.png"));
 
   set_safe_words(QStringList() << "lastfm" << "last.fm");
@@ -74,3 +74,11 @@ void LastFMSearchProvider::RecreateItems() {
 
   SetItems(items);
 }
+
+bool LastFMSearchProvider::IsLoggedIn() {
+  return service_->IsAuthenticated();
+}
+
+void LastFMSearchProvider::ShowConfig() {
+  service_->ShowConfig();
+}

src/globalsearch/lastfmsearchprovider.h

@@ -28,6 +28,9 @@ public:
 
   void LoadArtAsync(int id, const Result& result);
 
+  bool IsLoggedIn();
+  void ShowConfig();
+
 protected:
   void RecreateItems();
 

src/globalsearch/searchprovider.h

@@ -81,7 +81,12 @@ public:
     // normal place in the song metadata.  LoadArtAsync will never be called and
     // WantsSerialisedArtQueries and ArtIsProbablyRemote will be ignored if
     // they are set as well.  The GlobalSearch engine will load the art itself.
-    ArtIsInSongMetadata = 0x08
+    ArtIsInSongMetadata = 0x08,
+
+    // Indicates this provider has a config dialog that can be shown by calling
+    // CanShowConfig.  If this is not set then the button will be greyed out
+    // in the GUI.
+    CanShowConfig = 0x10
   };
   Q_DECLARE_FLAGS(Hints, Hint)
 
@@ -94,6 +99,7 @@ public:
   bool wants_serialised_art() const { return hints() & WantsSerialisedArtQueries; }
   bool art_is_probably_remote() const { return hints() & ArtIsProbablyRemote; }
   bool art_is_in_song_metadata() const { return hints() & ArtIsInSongMetadata; }
+  bool can_show_config() const { return hints() & CanShowConfig; }
 
   // Starts a search.  Must emit ResultsAvailable zero or more times and then
   // SearchFinished exactly once, using this ID.
@@ -110,8 +116,7 @@ public:
   // If provider needs user login to search and play songs, this method should
   // be reimplemented
   virtual bool IsLoggedIn() { return true; }
-  virtual bool CanShowConfig() const { return false; }
-  virtual void ShowConfig() { }
+  virtual void ShowConfig() { } // Remember to set the CanShowConfig hint
 
   static QImage ScaleAndPad(const QImage& image);
 

src/globalsearch/spotifysearchprovider.cpp

@@ -29,7 +29,8 @@ SpotifySearchProvider::SpotifySearchProvider(QObject* parent)
     service_(NULL)
 {
   Init("Spotify", "spotify", QIcon(":icons/32x32/spotify.png"),
-       WantsDelayedQueries | WantsSerialisedArtQueries | ArtIsProbablyRemote);
+       WantsDelayedQueries | WantsSerialisedArtQueries | ArtIsProbablyRemote |
+       CanShowConfig);
 }
 
 SpotifyServer* SpotifySearchProvider::server() {

src/globalsearch/spotifysearchprovider.h

@@ -36,7 +36,6 @@ public:
   void LoadTracksAsync(int id, const Result& result);
 
   bool IsLoggedIn();
-  bool CanShowConfig() const { return true; }
   void ShowConfig();
 
 private slots:

src/internet/internetservice.h

@@ -58,9 +58,6 @@ public:
 
   virtual QString Icon() { return QString(); }
 
-  // Services which need user login will need to reimplement this method
-  virtual bool IsLoggedIn() const { return true; }
-
 public slots:
   // Show configuration panel for services which have one
   virtual void ShowConfig() { }