implement mouse release handler

components/slider.cpp

@@ -76,3 +76,16 @@ void Slider::mouseMoveEvent(QMouseEvent *event)
 
     QAbstractSlider::mouseMoveEvent(event);
 }
+
+void Slider::mouseReleaseEvent(QMouseEvent *event)
+{
+    Q_D(Slider);
+
+    QRect track(d->trackGeometry().adjusted(-2, -2, 2, 2));
+
+    if (track.contains(event->pos())) {
+        setValue(d->valueFromPosition(event->pos()));
+    }
+
+    QAbstractSlider::mouseReleaseEvent(event);
+}

components/slider.h

@@ -20,6 +20,7 @@ public:
 protected:
     void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
     void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 
     const QScopedPointer<SliderPrivate> d_ptr;
 

components/slider_p.h

@@ -111,6 +111,24 @@ public:
 #endif
     }
 
+    int valueFromPosition(const QPoint &pos) const
+    {
+        Q_Q(const Slider);
+
+        const int span = Qt::Horizontal == orientation
+            ? q->rect().width() - THUMB_OUTER_SIZE
+            : q->rect().height() - THUMB_OUTER_SIZE;
+
+        const int position = Qt::Horizontal == orientation ? pos.x() : pos.y();
+
+        return Style::sliderValueFromPosition(
+                    q->minimum(),
+                    q->maximum(),
+                    position - THUMB_OUTER_SIZE/2,
+                    span,
+                    false);
+    }
+
     Slider *const q_ptr;
 
     Qt::Orientation orientation;

examples/sliderexamples.cpp

@@ -145,7 +145,5 @@ void SliderExamples::flip()
 
 void SliderExamples::updateSliderValue()
 {
-    int n = _edit2->text().toInt();
-    qDebug() << n;
-    _slider2->setValue(n);
+    _slider2->setValue(_edit2->text().toInt());
 }