make mental note that QAbstractButton subclass needs to implement sizeHint

components/toggle.cpp

@@ -1,4 +1,6 @@
 #include <QAbstractButton>
+#include <QDebug>
+#include <QPainter>
 #include "toggle.h"
 #include "../lib/rippleoverlay.h"
 
@@ -6,6 +8,7 @@ Toggle::Toggle(QWidget *parent)
     : QAbstractButton(parent),
       _overlay(new RippleOverlay(this))
 {
+    qDebug() << "1";
 }
 
 Toggle::~Toggle()
@@ -15,5 +18,17 @@ Toggle::~Toggle()
 void Toggle::paintEvent(QPaintEvent *event)
 {
     Q_UNUSED(event)
-}
 
+    qDebug() << "2";
+
+    QPainter painter(this);
+
+    QPen pen;
+    pen.setColor(Qt::black);
+    pen.setWidth(2);
+    painter.setPen(pen);
+
+    painter.drawRect(rect());
+
+    painter.drawRect(QRect(10, 10, 30, 30));
+}

components/toggle.h

@@ -13,6 +13,8 @@ public:
     explicit Toggle(QWidget *parent = 0);
     ~Toggle();
 
+    QSize sizeHint() const { return QSize(32, 32); }
+
 protected:
     void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;