Added methods for better permission checks in modules.

Added method for returning selected entity in grid.
Added polymorphic methods for delete record and fill grid.

core/igridform.cpp

@@ -4,6 +4,7 @@
 #include <QList>
 #include <QDebug>
 #include <QMap>
+#include <QItemSelectionModel>
 
 #include "context.h"
 #include "filterui.h"
@@ -23,6 +24,10 @@ IGridForm::IGridForm(QWidget *parent) :
     m_columnDialog = new ColumnDialog(this);
     connect(m_columnDialog, SIGNAL(accepted()), this, SLOT(columnsAccepted()));
 
+    connect(ui->tableView->selectionModel(), &QItemSelectionModel::currentRowChanged, [this](const QModelIndex &current, const QModelIndex &){
+        currentIndexChanged(current);
+    });
+
     m_varFiller = new VariableFiller();
 }
 
@@ -91,6 +96,12 @@ QWidget *IGridForm::filterWidget()
 void IGridForm::enableButtons()
 {
     ui->btnNew->setEnabled(canAddRecord());
+
+    if (ui->tableView->currentIndex().isValid())
+    {
+        ui->btnEdit->setEnabled(canEditRecord());
+        ui->btnDelete->setEnabled(canDeleteRecord());
+    }
 }
 
 
@@ -163,11 +174,7 @@ void IGridForm::on_btnFilter_toggled(bool checked)
 
 void IGridForm::on_tableView_clicked(const QModelIndex &)
 {
-    if (ui->tableView->currentIndex().isValid())
-    {
-        ui->btnEdit->setEnabled(canEditRecord());
-        ui->btnDelete->setEnabled(canDeleteRecord());
-    }
+    enableButtons();
 }
 
 void IGridForm::on_btnPrint_clicked()