add basic state machine boilerplate

components/textfield_internal.cpp

@@ -1 +1,12 @@
 #include "textfield_internal.h"
+#include "textfield.h"
+
+TextFieldStateMachine::TextFieldStateMachine(TextField *parent)
+    : QStateMachine(parent),
+      textField(parent)
+{
+}
+
+TextFieldStateMachine::~TextFieldStateMachine()
+{
+}

components/textfield_internal.h

@@ -1,4 +1,22 @@
 #ifndef TEXTFIELD_INTERNAL_H
 #define TEXTFIELD_INTERNAL_H
 
+#include <QStateMachine>
+
+class TextField;
+
+class TextFieldStateMachine : public QStateMachine
+{
+    Q_OBJECT
+
+public:
+    TextFieldStateMachine(TextField *parent);
+    ~TextFieldStateMachine();
+
+private:
+    Q_DISABLE_COPY(TextFieldStateMachine)
+
+    TextField *const textField;
+};
+
 #endif // TEXTFIELD_INTERNAL_H