Clean up the model

Add custom roles for QML
Set roleNames()
Use switch() instead of if()
Remove PixmapRole, DecorationRole is enough

src/model/danboorupostmodel.cpp

@@ -81,46 +81,34 @@ QVariant DanbooruPostModel::data(const QModelIndex &index, int role) const
         return QVariant();
     }
 
-    if (role == Qt::DisplayRole) {
-
+    switch(role) {
+        case Qt::DisplayRole:
+        {
             QVariant variant;
             variant.setValue(post);
 
             return variant;
         }
 
-    if (role == Qt::DecorationRole) {
+        case Qt::DecorationRole:
+        {
             const QPixmap pixmap = post->pixmap();
             return pixmap;
         }
-
-    if (role == Qt::ToolTipRole) {
+        case Qt::ToolTipRole:
             return post->fileUrl().fileName();
-    }
-
-    if (role == DanbooruPostModel::PixmapRole) {
-        QPixmap pixmap = post->pixmap();
-        return pixmap;
-    }
-
-    if (role == FileUrlRole) {
+        case FileUrlRole:
             return post->fileUrl();
-    }
-
-    if (role == ThumbUrlRole) {
+        case ThumbUrlRole:
             return post->thumbnailUrl();
-    }
-
-    if (role == SizeRole) {
+        case SizeRole:
             return post->size();
-    }
-
-    if (role == ResolutionRole) {
+        case ResolutionRole:
             return QSize(post->width(), post->height());
-    }
-
-    if (role == RatingRole) {
+        case RatingRole:
             return post->rating();
+        default:
+            return QVariant();
     }
 
     return QVariant();
@@ -143,7 +131,7 @@ void DanbooruPostModel::clear()
 QHash< int, QByteArray > DanbooruPostModel::roleNames() const
 {
     QHash<int, QByteArray> roles;
-    roles[PixmapRole] = "thumbPix";
+    roles[Qt::DecorationRole] = "thumbPix";
     roles[FileUrlRole] = "fileUrl";
     roles[ThumbUrlRole] = "thumbnailUrl";
     roles[RatingRole] = "rating";

src/model/danboorupostmodel.h

@@ -62,7 +62,6 @@ public:
     QHash<int, QByteArray> roleNames() const;
 
     enum PostRoles {
-        PixmapRole = Qt::UserRole + 1000,
         FileUrlRole = Qt::UserRole + 1001,
         ThumbUrlRole = Qt::UserRole + 1002,
         SizeRole = Qt::UserRole + 1003,