enable/disable delete button

src/gui/mainwindow.ui

@@ -206,7 +206,7 @@
             <item>
              <widget class="QPushButton" name="cancleAllArticlesButton">
               <property name="enabled">
-               <bool>false</bool>
+               <bool>true</bool>
               </property>
               <property name="text">
                <string>Alles stornieren</string>

src/gui/sellerdialog.cpp

@@ -8,6 +8,7 @@
 SellerDialog::SellerDialog(QWidget* parent, Qt::WindowFlags f) : QDialog(parent, f)
 {
     ui_.setupUi(this);
+    ui_.editButton->setVisible(false);
     SellerModel* model =
         new SellerModel(dynamic_cast<MainWindow*>(parent)->getMarketplace(), ui_.tableView);
     ui_.tableView->setModel(model);
@@ -16,6 +17,8 @@ SellerDialog::SellerDialog(QWidget* parent, Qt::WindowFlags f) : QDialog(parent,
     connect(ui_.deleteButton, &QPushButton::clicked, this, &SellerDialog::on_deleteButton_clicked);
     connect(model, &SellerModel::duplicateSellerNo, this,
             &SellerDialog::on_model_duplicateSellerNo);
+    connect(ui_.tableView->selectionModel(), &QItemSelectionModel::selectionChanged, this,
+            &SellerDialog::onSellerViewSelectionChanged);
 }
 
 void SellerDialog::on_newButton_clicked()
@@ -72,4 +75,14 @@ void SellerDialog::accept()
         }
     }
     QDialog::accept();
+}
+
+void SellerDialog::onSellerViewSelectionChanged(const QItemSelection& selected,
+                                                [[maybe_unused]] const QItemSelection& deselected)
+{
+    if (selected.size() > 0) {
+        ui_.deleteButton->setEnabled(true);
+    } else {
+        ui_.deleteButton->setEnabled(false);
+    }
 }

src/gui/sellerdialog.h

@@ -15,6 +15,10 @@ class SellerDialog : public QDialog
     SellerDialog(QWidget* parent = nullptr,
                  Qt::WindowFlags f = Qt::WindowTitleHint | Qt::WindowSystemMenuHint);
 
+  private slots:
+    void onSellerViewSelectionChanged(const QItemSelection& selected,
+                                      const QItemSelection& deselected);
+
   private:
     void on_newButton_clicked();
     void on_deleteButton_clicked();

src/gui/sellerdialog.ui

@@ -65,6 +65,9 @@
        </item>
        <item>
         <widget class="QPushButton" name="deleteButton">
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
          <property name="text">
           <string>Löschen</string>
          </property>