protected against errors. Need to put error labels

pps_ws/src/d_fall_pps/GUI_Qt/CrazyFlyGUI/include/CFLinker.h

@@ -12,6 +12,12 @@
 class CFLinker
 {
 public:
+
+    struct link {
+        int student_id;
+        int cf_zone_index;
+        std::string cf_name;
+    };
     explicit CFLinker(Ui::MainGUIWindow* ui, std::vector<crazyFly*> *crazyflies_vector, std::vector<crazyFlyZone*> *crazyfly_zones);
     ~CFLinker();
 
@@ -19,15 +25,10 @@ public:
 
     void unlink();
 
-private:
-
-    struct link {
-        int cf_zone_index;
-        std::string cf_name;
-    };
-
     std::vector<struct link> links;
 
+private:
+
     // QTableWidget m_p_table;
 
     Ui::MainGUIWindow* m_ui;

pps_ws/src/d_fall_pps/GUI_Qt/CrazyFlyGUI/src/CFLinker.cpp

@@ -45,6 +45,7 @@ void CFLinker::link()
     m_ui->table_links->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
     struct link tmp_link;
 
+    tmp_link.student_id = m_ui->spinBox_student_ids->value();
     tmp_link.cf_zone_index = getCFZoneIndexFromName(m_ui->comboBoxCFZones->currentText());
     tmp_link.cf_name = m_ui->comboBoxCFs->currentText().toStdString();
 
@@ -58,6 +59,17 @@ void CFLinker::link()
 
     links.push_back(tmp_link);
     // TODO: remove options linked from available ones
+
+    int index = m_ui->comboBoxCFs->currentIndex();
+    // remove items
+    m_ui->comboBoxCFs->removeItem(index);
+    index = m_ui->comboBoxCFZones->currentIndex();
+    m_ui->comboBoxCFZones->removeItem(index);
+
+    // disable item
+    // m_ui->comboBoxCFs->setItemData(index, 0, Qt::UserRole - 1);
+    // enable item
+    // ui->comboBox->setItemData(index, 33, Qt::UserRole - 1);
 }
 
 void CFLinker::unlink()

pps_ws/src/d_fall_pps/GUI_Qt/CrazyFlyGUI/src/mainguiwindow.cpp

@@ -113,6 +113,7 @@ void MainGUIWindow::_init()
     		selectedItem->setFont(fnt);
     	}
     }
+    ui->table_links->setSelectionBehavior(QAbstractItemView::SelectRows);
 
     // scene
     scene = new myGraphicsScene(ui->frame_drawing);
@@ -549,6 +550,33 @@ void MainGUIWindow::on_refresh_student_ids_button_clicked()
 void MainGUIWindow::on_link_button_clicked()
 {
     #ifdef CATKIN_MAKE
-    cf_linker->link();
+
+    bool error = false;
+    if(ui->comboBoxCFs->count() == 0)
+    {
+        // plot error message
+        error = true;
+    }
+    if(ui->comboBoxCFZones->count() == 0)
+    {
+        // plot error message
+        error = true;
+    }
+
+    for(int i = 0; i < cf_linker->links.size(); i++)
+    {
+        if(cf_linker->links[i].student_id == ui->spinBox_student_ids->value())
+        {
+            // value already linked, choose different one
+            // plot error message
+            error = true;
+        }
+    }
+
+    if(!error)
+    {
+        // remove error messages
+        cf_linker->link();
+    }
     #endif
 }