SqliteTableModel: Don't show binary data in table widgets

Don't show BLOBs as binary data in table widgets, instead put a "BLOB"
text in that cell.

Also make BLOBs not editable unless you use the edit dialog.

src/MainWindow.cpp

@@ -604,7 +604,7 @@ void MainWindow::editWinAway()
 
 void MainWindow::editText(const QModelIndex& index)
 {
-    editWin->loadText(index.data().toByteArray(), index.row(), index.column());
+    editWin->loadText(index.data(Qt::EditRole).toByteArray(), index.row(), index.column());
     editWin->show();
 }
 

src/sqlitetablemodel.cpp

@@ -143,7 +143,10 @@ QVariant SqliteTableModel::data(const QModelIndex &index, int role) const
         while(index.row() >= m_data.size() && canFetchMore())
             const_cast<SqliteTableModel*>(this)->fetchMore();   // Nothing evil to see here, move along
 
-        return m_data.at(index.row()).at(index.column());
+        if(role == Qt::DisplayRole && isBinary(index))
+            return "(BLOB)";
+        else
+            return m_data.at(index.row()).at(index.column());
     } else {
         return QVariant();
     }
@@ -186,7 +189,10 @@ Qt::ItemFlags SqliteTableModel::flags(const QModelIndex& index) const
     if(!index.isValid())
         return Qt::ItemIsEnabled;
 
-    return QAbstractTableModel::flags(index) | Qt::ItemIsEditable;
+    Qt::ItemFlags ret = QAbstractTableModel::flags(index);
+    if(!isBinary(index))
+        ret |= Qt::ItemIsEditable;
+    return ret;
 }
 
 void SqliteTableModel::sort(int column, Qt::SortOrder order)
@@ -338,3 +344,9 @@ void SqliteTableModel::clearCache()
     m_data.clear();
     endRemoveRows();
 }
+
+bool SqliteTableModel::isBinary(const QModelIndex& index) const
+{
+    QByteArray val = m_data.at(index.row()).at(index.column());
+    return val.size() > 1024 || val.contains('\0');     // Cheap BLOB test here...
+}

src/sqlitetablemodel.h

@@ -35,6 +35,8 @@ public:
 
     bool valid() const { return m_valid; }
 
+    bool isBinary(const QModelIndex& index) const;
+
     typedef QList<QByteArray> QByteArrayList;
 
 signals: