cleanup

window.cpp

 #include "window.h"
 #include <QApplication>
-#include <QStandardPaths>
 #include <QDebug>
-#include <QThread>
-#include <QProgressBar>
+#include <QPushButton>
 #include <QSlider>
 #include <QGridLayout>
 #include <QHBoxLayout>
@@ -11,6 +9,7 @@
 #include <QSpacerItem>
 #include <QTimer>
 
+
 Window::Window(QWidget *parent)
     : QWidget{parent}
 {
@@ -25,9 +24,9 @@ Window::Window(QWidget *parent)
     m_slider->setValue(m_delay);
     connect(m_slider, SIGNAL(valueChanged(int)), this, SLOT(setValue(int)));
 
-    QHBoxLayout *horizontalLayout = new QHBoxLayout(this);
-    QVBoxLayout *verticalLayout = new QVBoxLayout();
-    QGridLayout *layout = new QGridLayout();
+    horizontalLayout = new QHBoxLayout(this);
+    verticalLayout = new QVBoxLayout();
+    layout = new QGridLayout();
 
     m_spacer[0] = new QSpacerItem(4, 4, QSizePolicy::Minimum, QSizePolicy::Fixed);
     m_spacer[1] = new QSpacerItem(4, 4, QSizePolicy::Minimum, QSizePolicy::Fixed);

window.h

@@ -2,11 +2,13 @@
 #define WINDOW_H
 
 #include <QWidget>
-#include <QPushButton>
-#include <QProgressBar>
-#include <QSlider>
 #include "cell.h"
 class QSpacerItem;
+class QHBoxLayout;
+class QVBoxLayout;
+class QGridLayout;
+class QPushButton;
+class QSlider;
 class Window : public QWidget
 {
     Q_OBJECT
@@ -20,6 +22,9 @@ private:
     std::array<Cell, 81> m_cell;
     int m_delay = 300;
     QSpacerItem *m_spacer[3];
+    QHBoxLayout *horizontalLayout;
+    QVBoxLayout *verticalLayout;
+    QGridLayout *layout;
     struct History
     {
         Cell *cell;