add boilerplate for drawer private class

components/drawer.cpp

@@ -1,4 +1,10 @@
 #include "drawer.h"
+#include "drawer_p.h"
+
+DrawerPrivate(Drawer *q)
+    : q_ptr(q)
+{
+}
 
 Drawer::Drawer(QWidget *parent)
     : QWidget(parent)

components/drawer.h

@@ -11,9 +11,11 @@ public:
     explicit Drawer(QWidget *parent = 0);
     ~Drawer();
 
+    Drawer *const q_ptr;
+
 private:
     Q_DISABLE_COPY(Drawer)
-    //Q_DECLARE_PRIVATE(Drawer)
+    Q_DECLARE_PRIVATE(Drawer)
 };
 
 #endif // DRAWER_H

components/drawer_p.h

@@ -0,0 +1,17 @@
+#ifndef DRAWER_P_H
+#define DRAWER_P_H
+
+#include <QtGlobal>
+
+class Drawer;
+
+class DrawerPrivate
+{
+    Q_DISABLE_COPY(DrawerPrivate)
+    Q_DECLARE_PUBLIC(Drawer)
+
+public:
+    DrawerPrivate(Drawer *q);
+};
+
+#endif // DRAWER_P_H

qt-material-widgets.pro

@@ -158,7 +158,8 @@ HEADERS  += mainwindow.h \
     components/dialog_internal.h \
     lib/transparencyproxy.h \
     lib/transparencyproxy_p.h \
-    lib/transparencyproxy_internal.h
+    lib/transparencyproxy_internal.h \
+    components/drawer_p.h
 
 RESOURCES += \
     resources.qrc