draw basic Slider track geometry

components/slider.cpp

@@ -13,12 +13,30 @@ Slider::~Slider()
 {
 }
 
+void Slider::setOrientation(Qt::Orientation orientation)
+{
+    Q_D(Slider);
+    d->orientation = orientation;
+    update();
+}
+
+Qt::Orientation Slider::orientation() const
+{
+    Q_D(const Slider);
+    return d->orientation;
+}
+
 void Slider::paintEvent(QPaintEvent *event)
 {
     Q_UNUSED(event)
 
+    Q_D(Slider);
+
     QPainter painter(this);
 
+    d->paintTrack(&painter);
+    d->paintThumb(&painter);
+
 #ifdef DEBUG_LAYOUT
     QPen pen;
     pen.setColor(Qt::red);

components/slider.h

@@ -14,6 +14,9 @@ public:
     explicit Slider(QWidget *parent = 0);
     ~Slider();
 
+    void setOrientation(Qt::Orientation orientation);
+    Qt::Orientation orientation() const;
+
 protected:
     void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 

components/slider_p.h

@@ -2,6 +2,7 @@
 #define SLIDER_P_H
 
 #include "slider.h"
+#include <QPainter>
 
 class SliderPrivate
 {
@@ -10,11 +11,47 @@ class SliderPrivate
 
 public:
     SliderPrivate(Slider *parent)
-        : q_ptr(parent)
+        : q_ptr(parent),
+          orientation(Qt::Horizontal)
     {
     }
 
+    QRect trackGeometry() const
+    {
+        Q_Q(const Slider);
+
+        return Qt::Horizontal == orientation
+            ? QRect(0, q->rect().height()/2 - 1, q->rect().width(), 2)
+            : QRect(q->rect().width()/2 - 1, 0, 2, q->rect().height());
+    }
+
+    void paintTrack(QPainter *painter)
+    {
+        Q_Q(Slider);
+
+        QBrush brush;
+        brush.setStyle(Qt::SolidPattern);
+        brush.setColor(QColor(0, 0, 0, 255));
+
+        painter->save();
+        painter->fillRect(trackGeometry(), brush);
+        painter->restore();
+
+#ifdef DEBUG_LAYOUT
+        painter->drawRect(q->rect().adjusted(1, 1, -2, -2));
+#endif
+    }
+
+    void paintThumb(QPainter *painter)
+    {
+        painter->save();
+
+        painter->restore();
+    }
+
     Slider *const q_ptr;
+
+    Qt::Orientation orientation;
 };
 
 #endif // SLIDER_P_H