Changed the behaviour of attribute editor as described into the discussion of ticker #289 to fix it.

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@11331 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: rugginoso

src/plugins/grass/qgsgrassattributes.cpp

@@ -15,7 +15,6 @@
  ***************************************************************************/
 
 #include "qgsgrassattributes.h"
-#include "qgsgrassedit.h"
 #include "qgsgrassprovider.h"
 
 #include "qgslogger.h"
@@ -352,3 +351,12 @@ void QgsGrassAttributes::columnSizeChanged( int section, int oldSize, int newSiz
   QgsDebugMsg( QString( "path = %1 newSize = %2" ).arg( path ).arg( newSize ) );
   settings.setValue( path, newSize );
 }
+
+void QgsGrassAttributes::setCategoryMode(QgsGrassEdit::CatMode mode, const QString &cat)
+{
+    if (mode == QgsGrassEdit::CAT_MODE_NOCAT || (mode == QgsGrassEdit::CAT_MODE_MANUAL && cat.isEmpty())){
+        newButton->setEnabled(false);
+    } else {
+        newButton->setEnabled(true);
+    }
+}

src/plugins/grass/qgsgrassattributes.h

@@ -19,6 +19,7 @@
 /* First attribute in the table is always field, second attribute is category */
 
 #include "ui_qgsgrassattributesbase.h"
+#include "qgsgrassedit.h"
 
 class QgsGrassProvider;
 class QgsGrassEdit;
@@ -105,6 +106,9 @@ class QgsGrassAttributes: public QDialog, private Ui::QgsGrassAttributesBase
     //! Remove all tabs
     void clear();
 
+    //! Enable/disable buttons depending on the category mode
+    void setCategoryMode(QgsGrassEdit::CatMode mode, const QString &cat);
+
   private:
     //! Pointer to vector provider
     QgsGrassProvider *mProvider;

src/plugins/grass/qgsgrassedittools.cpp

@@ -916,4 +916,6 @@ void QgsGrassEditAttributes::mouseClick( QgsPoint & point, Qt::MouseButton butto
     e->mAttributes->show();
     e->mAttributes->raise();
   }
+
+    e->mAttributes->setCategoryMode(static_cast<QgsGrassEdit::CatMode>(e->mCatModeBox->currentIndex()), e->mCatEntry->text());
 }