set correct slider thumb position from current value

components/slider.cpp

@@ -1,5 +1,6 @@
 #include "slider.h"
 #include <QPainter>
+#include <QStringBuilder>
 #include <QMouseEvent>
 #include <QDebug>
 
@@ -49,8 +50,8 @@ void Slider::paintEvent(QPaintEvent *event)
     painter.drawRect(rect().adjusted(0, 0, -1, -1));
 
     painter.setFont(QFont("monospace", 8));
-    painter.drawText(8, 18, "Value: ");
+    painter.drawText(8, 18, "Value: " % QString::number(value()));
-    painter.drawText(8, 36, "Position: ");
+    painter.drawText(8, 36, "Position: " % QString::number(sliderPosition()));
 #endif
 }
 

components/slider_p.h

@@ -3,6 +3,7 @@
 
 #include "slider.h"
 #include <QPainter>
+#include "lib/style.h"
 
 #define THUMB_OUTER_SIZE 30
 
@@ -60,10 +61,21 @@ public:
     {
         Q_Q(const Slider);
 
+        const int span = Qt::Horizontal == orientation
+            ? q->rect().width() - THUMB_OUTER_SIZE
+            : q->rect().height() - THUMB_OUTER_SIZE;
+
+        const int pos = Style::sliderPositionFromValue(
+                    q->minimum(),
+                    q->maximum(),
+                    q->value(),
+                    span,
+                    false);
+
         return Qt::Horizontal == orientation
-            ? QRectF(0, q->rect().height()/2 - THUMB_OUTER_SIZE/2,
+            ? QRectF(pos, q->rect().height()/2 - THUMB_OUTER_SIZE/2,
                      THUMB_OUTER_SIZE, THUMB_OUTER_SIZE)
-            : QRectF(q->rect().width()/2 - THUMB_OUTER_SIZE/2, 0,
+            : QRectF(q->rect().width()/2 - THUMB_OUTER_SIZE/2, pos,
                      THUMB_OUTER_SIZE, THUMB_OUTER_SIZE);
     }
 

examples/sliderexamples.cpp

@@ -10,7 +10,9 @@
 SliderExamples::SliderExamples(QWidget *parent)
     : ExampleList(parent),
       _edit(new QLineEdit),
-      _slider(new Slider)
+      _edit2(new QLineEdit),
+      _slider(new Slider),
+      _slider2(new Slider)
 {
     QLayout *mainLayout = widget()->layout();
 
@@ -96,6 +98,34 @@ SliderExamples::SliderExamples(QWidget *parent)
 
         connect(button, SIGNAL(pressed()), this, SLOT(flip()));
     }
+    {
+        QVBoxLayout *layout = new QVBoxLayout;
+        QWidget *widget = new QWidget;
+        widget->setLayout(layout);
+        widget->setMinimumWidth(350);
+
+        QHBoxLayout *hLayout = new QHBoxLayout;
+        QPushButton *button = new QPushButton("Update value");
+        hLayout->addWidget(_edit2);
+        hLayout->addWidget(button);
+
+        _slider2->setMinimumWidth(250);
+        layout->addWidget(_slider2);
+        layout->addLayout(hLayout);
+
+        ExampleView *view = new ExampleView;
+        view->setWidget(widget);
+
+        Frame *frame = new Frame;
+        frame->setCodeSnippet(
+            "Slider *slider = new Slider;"
+        );
+        frame->setWidget(view);
+
+        mainLayout->addWidget(frame);
+
+        connect(button, SIGNAL(pressed()), this, SLOT(updateSliderValue()));
+    }
 }
 
 SliderExamples::~SliderExamples()
@@ -112,3 +142,10 @@ void SliderExamples::flip()
     _slider->setOrientation(Qt::Horizontal == _slider->orientation() ?
         Qt::Vertical : Qt::Horizontal);
 }
+
+void SliderExamples::updateSliderValue()
+{
+    int n = _edit2->text().toInt();
+    qDebug() << n;
+    _slider2->setValue(n);
+}

examples/sliderexamples.h

@@ -17,10 +17,13 @@ public:
 protected slots:
     void updateValue(int value);
     void flip();
+    void updateSliderValue();
 
 private:
     QLineEdit *const _edit;
+    QLineEdit *const _edit2;
     Slider    *const _slider;
+    Slider    *const _slider2;
 };
 
 #endif // SLIDEREXAMPLES_H