Collapse all info sections by default except the first one of each type but add support for using user preferences (they don't get saved yet), add a fade in/out animation to collapsed section headers.

src/songinfo/artistinfoview.cpp

@@ -58,4 +58,6 @@ void ArtistInfoView::ResultReady(int id, const SongInfoFetcher::Result& result)
   foreach (const CollapsibleInfoPane::Data& data, result.info_) {
     AddSection(new CollapsibleInfoPane(data, this));
   }
+
+  CollapseSections();
 }

src/songinfo/collapsibleinfoheader.cpp

@@ -19,6 +19,7 @@
 #include <QApplication>
 #include <QMouseEvent>
 #include <QPainter>
+#include <QPropertyAnimation>
 #include <QStyleOption>
 
 const int CollapsibleInfoHeader::kHeight = 20;
@@ -26,8 +27,10 @@ const int CollapsibleInfoHeader::kIconSize = 16;
 
 CollapsibleInfoHeader::CollapsibleInfoHeader(QWidget* parent)
   : QWidget(parent),
-    expanded_(true),
-    hovering_(false)
+    expanded_(false),
+    hovering_(false),
+    animation_(new QPropertyAnimation(this, "opacity", this)),
+    opacity_(0.0)
 {
   setMinimumHeight(kHeight);
   setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
@@ -56,17 +59,45 @@ void CollapsibleInfoHeader::SetExpanded(bool expanded) {
 
 void CollapsibleInfoHeader::enterEvent(QEvent*) {
   hovering_ = true;
-  update();
+  if (!expanded_) {
+    animation_->stop();
+    animation_->setEndValue(1.0);
+    animation_->setDuration(80);
+    animation_->start();
+  }
 }
 
 void CollapsibleInfoHeader::leaveEvent(QEvent*) {
   hovering_ = false;
+  if (!expanded_) {
+    animation_->stop();
+    animation_->setEndValue(0.0);
+    animation_->setDuration(160);
+    animation_->start();
+  }
+}
+
+void CollapsibleInfoHeader::set_opacity(float opacity) {
+  opacity_ = opacity;
   update();
 }
 
 void CollapsibleInfoHeader::paintEvent(QPaintEvent* e) {
   QPainter p(this);
 
+  QColor active_text_color(palette().color(QPalette::Active, QPalette::HighlightedText));
+  QColor inactive_text_color(palette().color(QPalette::Active, QPalette::Text));
+  QColor text_color;
+  if (expanded_) {
+    text_color = active_text_color;
+  } else {
+    p.setOpacity(0.4 + opacity_ * 0.6);
+    text_color = QColor(
+        active_text_color.red() * opacity_   + inactive_text_color.red()   * (1.0 - opacity_),
+        active_text_color.green() * opacity_ + inactive_text_color.green() * (1.0 - opacity_),
+        active_text_color.blue() * opacity_  + inactive_text_color.blue()  * (1.0 - opacity_));
+  }
+
   QRect indicator_rect(0, 0, height(), height());
   QRect icon_rect(height() + 2, (kHeight - kIconSize) / 2, kIconSize, kIconSize);
   QRect text_rect(rect());
@@ -112,7 +143,7 @@ void CollapsibleInfoHeader::paintEvent(QPaintEvent* e) {
   bold_font.setBold(true);
   p.setFont(bold_font);
 
-  p.setPen(palette().color(QPalette::Active, QPalette::HighlightedText));
+  p.setPen(text_color);
   p.drawText(text_rect, Qt::AlignLeft | Qt::AlignVCenter, title_);
 }
 

src/songinfo/collapsibleinfoheader.h

@@ -20,8 +20,11 @@
 #include <QIcon>
 #include <QWidget>
 
+class QPropertyAnimation;
+
 class CollapsibleInfoHeader : public QWidget {
   Q_OBJECT
+  Q_PROPERTY(float opacity READ opacity WRITE set_opacity);
 
 public:
   CollapsibleInfoHeader(QWidget* parent = 0);
@@ -34,6 +37,9 @@ public:
   const QString& title() const { return title_; }
   const QIcon& icon() const { return icon_; }
 
+  float opacity() const { return opacity_; }
+  void set_opacity(float opacity);
+
 public slots:
   void SetExpanded(bool expanded);
   void SetTitle(const QString& title);
@@ -55,6 +61,9 @@ private:
   bool hovering_;
   QString title_;
   QIcon icon_;
+
+  QPropertyAnimation* animation_;
+  float opacity_;
 };
 
 #endif // COLLAPSIBLEINFOHEADER_H

src/songinfo/collapsibleinfopane.cpp

@@ -32,6 +32,7 @@ CollapsibleInfoPane::CollapsibleInfoPane(const Data& data, QWidget* parent)
 
   layout->addWidget(header_);
   layout->addWidget(data.contents_);
+  data.contents_->hide();
 
   header_->SetTitle(data.title_);
   header_->SetIcon(data.icon_);

src/songinfo/collapsibleinfopane.h

@@ -41,6 +41,7 @@ public:
       TypeCount
     };
 
+    QString id_;
     QString title_;
     QIcon icon_;
     Type type_;

src/songinfo/echonestbiographies.cpp

@@ -77,6 +77,7 @@ void EchoNestBiographies::RequestFinished() {
     already_seen.insert(canonical_site);
 
     CollapsibleInfoPane::Data data;
+    data.id_ = "echonest/bio/" + bio.site();
     data.title_ = tr("Biography from %1").arg(bio.site());
     data.type_ = CollapsibleInfoPane::Data::Type_Biography;
 

src/songinfo/echonestsimilarartists.cpp

@@ -51,6 +51,7 @@ void EchoNestSimilarArtists::RequestFinished() {
 
   if (!artists.isEmpty()) {
     CollapsibleInfoPane::Data data;
+    data.id_ = "echonest/similarartists";
     data.title_ = tr("Similar artists");
     data.type_ = CollapsibleInfoPane::Data::Type_Similar;
     data.icon_ = QIcon(":/providers/echonest.png");

src/songinfo/echonesttags.cpp

@@ -53,6 +53,7 @@ void EchoNestTags::RequestFinished() {
 
   if (!request->artist_->terms().isEmpty()) {
     CollapsibleInfoPane::Data data;
+    data.id_ = "echonest/artisttags";
     data.title_ = tr("Artist tags");
     data.type_ = CollapsibleInfoPane::Data::Type_Tags;
     data.icon_ = QIcon(":/last.fm/icon_tag.png");

src/songinfo/lastfmtrackinfoprovider.cpp

@@ -81,6 +81,7 @@ void LastfmTrackInfoProvider::GetPlayCounts(int id, const lastfm::XmlQuery& q) {
     return; // No useful data
 
   CollapsibleInfoPane::Data data;
+  data.id_ = "lastfm/playcounts";
   data.title_ = tr("Last.fm play counts");
   data.type_ = CollapsibleInfoPane::Data::Type_PlayCounts;
   data.icon_ = QIcon(":/last.fm/as.png");
@@ -113,6 +114,7 @@ void LastfmTrackInfoProvider::GetWiki(int id, const lastfm::XmlQuery& q) {
     return; // No useful data
 
   CollapsibleInfoPane::Data data;
+  data.id_ = "lastfm/songwiki";
   data.title_ = tr("Last.fm wiki");
   data.type_ = CollapsibleInfoPane::Data::Type_Biography;
   data.icon_ = QIcon(":/last.fm/as.png");
@@ -131,6 +133,7 @@ void LastfmTrackInfoProvider::GetTags(int id, const lastfm::XmlQuery& q) {
     return; // No tag elements
 
   CollapsibleInfoPane::Data data;
+  data.id_ = "lastfm/songtags";
   data.title_ = tr("Last.fm tags");
   data.type_ = CollapsibleInfoPane::Data::Type_Biography;
   data.icon_ = QIcon(":/last.fm/icon_tag.png");

src/songinfo/songinfobase.cpp

@@ -18,10 +18,13 @@
 
 #include <QFile>
 #include <QScrollArea>
+#include <QSettings>
 #include <QSpacerItem>
 #include <QTimer>
 #include <QVBoxLayout>
 
+const char* SongInfoBase::kSettingsGroup = "SongInfo";
+
 SongInfoBase::SongInfoBase(NetworkAccessManager* network, QWidget* parent)
   : QWidget(parent),
     network_(network),
@@ -141,3 +144,42 @@ void SongInfoBase::ResultReady(int id, const SongInfoFetcher::Result& result) {
     delete data.contents_;
   }
 }
+
+void SongInfoBase::CollapseSections() {
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  // Sections are already sorted by type and relevance, so the algorithm we use
+  // to determine which ones to show by default is:
+  //   * In the absense of any user preference, show the first (highest
+  //     relevance section of each type and hide the rest)
+  //   * If one or more sections in a type have been explicitly hidden/shown
+  //     by the user before then hide all sections in that type and show only
+  //     the ones that are explicitly shown.  If there are multiple sections in
+  //     that type, but they are all hidden, then show the first one.
+
+  QMap<CollapsibleInfoPane::Data::Type, CollapsibleInfoPane*> types_;
+  QSet<CollapsibleInfoPane::Data::Type> has_user_preference_;
+  QSet<CollapsibleInfoPane::Data::Type> has_user_preference_on_;
+  foreach (CollapsibleInfoPane* pane, sections_) {
+    const CollapsibleInfoPane::Data::Type type = pane->data().type_;
+    types_.insertMulti(type, pane);
+
+    QVariant preference = s.value(pane->data().id_);
+    if (preference.isValid()) {
+      has_user_preference_.insert(type);
+      if (preference.toBool()) {
+        has_user_preference_on_.insert(type);
+        pane->Expand();
+      }
+    }
+  }
+
+  foreach (CollapsibleInfoPane::Data::Type type, types_.keys()) {
+    if (!has_user_preference_.contains(type) ||
+        (!has_user_preference_on_.contains(type) && types_.values(type).count() > 1)) {
+      // Expand the first one
+      types_.values(type).last()->Expand();
+    }
+  }
+}

src/songinfo/songinfobase.h

@@ -37,6 +37,8 @@ class SongInfoBase : public QWidget {
 public:
   SongInfoBase(NetworkAccessManager* network, QWidget* parent = 0);
 
+  static const char* kSettingsGroup;
+
 public slots:
   void SongChanged(const Song& metadata);
   void SongFinished();
@@ -51,6 +53,7 @@ protected:
   void AddWidget(QWidget* widget);
   void AddSection(CollapsibleInfoPane* section);
   void Clear();
+  void CollapseSections();
 
 protected slots:
   virtual void ResultReady(int id, const SongInfoFetcher::Result& result);

src/songinfo/songinfoview.cpp

@@ -78,6 +78,8 @@ void SongInfoView::ResultReady(int id, const SongInfoFetcher::Result& result) {
   foreach (const CollapsibleInfoPane::Data& data, result.info_) {
     AddSection(new CollapsibleInfoPane(data, this));
   }
+
+  CollapseSections();
 }
 
 void SongInfoView::ReloadSettings() {

src/songinfo/ultimatelyricsprovider.cpp

@@ -116,6 +116,7 @@ void UltimateLyricsProvider::LyricsFetched(quint64 id, QNetworkReply* reply) {
 
   if (!lyrics.isEmpty()) {
     CollapsibleInfoPane::Data data;
+    data.id_ = "ultimatelyrics/" + name_;
     data.title_ = tr("Lyrics from %1").arg(name_);
     data.type_ = CollapsibleInfoPane::Data::Type_Lyrics;