node: merge various metadata functions into one

app/node/project/folder/folder.cpp

@@ -37,9 +37,13 @@ Folder::Folder()
   AddInput(kChildInput, NodeValue::kNone, InputFlags(kInputFlagArray | kInputFlagNotKeyframable));
 }
 
-QIcon Folder::icon() const
+QVariant Folder::data(const DataType &d) const
 {
-  return icon::Folder;
+  if (d == ICON) {
+    return icon::Folder;
+  }
+
+  return super::data(d);
 }
 
 void Folder::Retranslate()

app/node/project/folder/folder.h

@@ -59,7 +59,7 @@ public:
     return tr("Organize several items into a single collection.");
   }
 
-  virtual QIcon icon() const override;
+  virtual QVariant data(const DataType &d) const override;
 
   virtual void Retranslate() override;
 

app/node/project/footage/footage.cpp

@@ -203,26 +203,6 @@ const QString &Footage::decoder() const
   return decoder_;
 }
 
-QIcon Footage::icon() const
-{
-  if (valid_ && GetTotalStreamCount()) {
-    // Prioritize video > audio > image
-    VideoParams s = GetFirstEnabledVideoStream();
-
-    if (s.is_valid() && s.video_type() != VideoParams::kVideoTypeStill) {
-      return icon::Video;
-    } else if (HasEnabledAudioStreams()) {
-      return icon::Audio;
-    } else if (s.is_valid() && s.video_type() == VideoParams::kVideoTypeStill) {
-      return icon::Image;
-    } else if (HasEnabledSubtitleStreams()) {
-      return icon::Subtitles;
-    }
-  }
-
-  return icon::Error;
-}
-
 QString Footage::DescribeVideoStream(const VideoParams &params)
 {
   if (params.video_type() == VideoParams::kVideoTypeStill) {
@@ -375,26 +355,51 @@ void Footage::LoadFinishedEvent()
   }
 }
 
-qint64 Footage::creation_time() const
+QVariant Footage::data(const DataType &d) const
 {
-  QFileInfo info(filename());
+  switch (d) {
+  case CREATED_TIME:
+  {
+    QFileInfo info(filename());
 
-  if (info.exists()) {
-    return QtUtils::GetCreationDate(info).toSecsSinceEpoch();
+    if (info.exists()) {
+      return QtUtils::GetCreationDate(info).toSecsSinceEpoch();
+    }
+    break;
+  }
+  case MODIFIED_TIME:
+  {
+    QFileInfo info(filename());
+
+    if (info.exists()) {
+      return info.lastModified().toSecsSinceEpoch();
+    }
+    break;
+  }
+  case ICON:
+  {
+    if (valid_ && GetTotalStreamCount()) {
+      // Prioritize video > audio > image
+      VideoParams s = GetFirstEnabledVideoStream();
+
+      if (s.is_valid() && s.video_type() != VideoParams::kVideoTypeStill) {
+        return icon::Video;
+      } else if (HasEnabledAudioStreams()) {
+        return icon::Audio;
+      } else if (s.is_valid() && s.video_type() == VideoParams::kVideoTypeStill) {
+        return icon::Image;
+      } else if (HasEnabledSubtitleStreams()) {
+        return icon::Subtitles;
+      }
+    }
+
+    return icon::Error;
+  }
+  default:
+    break;
   }
 
-  return 0;
-}
-
-qint64 Footage::mod_time() const
-{
-  QFileInfo info(filename());
-
-  if (info.exists()) {
-    return info.lastModified().toSecsSinceEpoch();
-  }
-
-  return 0;
+  return super::data(d);
 }
 
 void Footage::UpdateTooltip()

app/node/project/footage/footage.h

@@ -153,8 +153,6 @@ public:
    */
   const QString& decoder() const;
 
-  virtual QIcon icon() const override;
-
   virtual bool IsItem() const override
   {
     return true;
@@ -176,8 +174,7 @@ public:
 
   virtual void LoadFinishedEvent() override;
 
-  virtual qint64 creation_time() const override;
-  virtual qint64 mod_time() const override;
+  virtual QVariant data(const DataType &d) const override;
 
   virtual int GetTotalStreamCount() const override { return total_stream_count_; }
 

app/node/project/sequence/sequence.cpp

@@ -71,9 +71,13 @@ void Sequence::add_default_nodes(MultiUndoCommand* command)
   }
 }
 
-QIcon Sequence::icon() const
+QVariant Sequence::data(const DataType &d) const
 {
-  return icon::Sequence;
+  if (d == ICON) {
+    return icon::Sequence;
+  }
+
+  return super::data(d);
 }
 
 QVector<Track *> Sequence::GetUnlockedTracks() const

app/node/project/sequence/sequence.h

@@ -59,7 +59,7 @@ public:
 
   void add_default_nodes(MultiUndoCommand *command = nullptr);
 
-  virtual QIcon icon() const override;
+  virtual QVariant data(const DataType &d) const override;
 
   const QVector<Track *> &GetTracks() const
   {