major api and quality of life changes

mainwindow.h

@@ -14,6 +14,8 @@ class MainWindow : public QMainWindow
     Q_OBJECT
 
 public:
+    QMap<QString, QColor> colorMap;
+
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
@@ -22,10 +24,15 @@ public slots:
 
 private slots:
     void on_spinGridWidth_valueChanged(int arg1);
-
     void on_spinGridHeight_valueChanged(int arg1);
 
+    void on_comboLineColor_currentTextChanged(const QString &arg1);
+    void on_listLines_currentRowChanged(int currentRow);
+
 private:
     Ui::MainWindow *ui;
+    int lastEditedLine = -1;
+
+    bool isSelectedLineCorrect(int line);
 };
 #endif // MAINWINDOW_H