Increase precision of volume widget slider

lib/utils/double-slider.cpp

@@ -0,0 +1,63 @@
+#include "double-slider.hpp"
+#include <QWheelEvent>
+
+#include <cmath>
+
+namespace advss {
+
+SliderIgnoreScroll::SliderIgnoreScroll(QWidget *parent) : QSlider(parent)
+{
+	setFocusPolicy(Qt::StrongFocus);
+}
+
+SliderIgnoreScroll::SliderIgnoreScroll(Qt::Orientation orientation,
+				       QWidget *parent)
+	: QSlider(parent)
+{
+	setFocusPolicy(Qt::StrongFocus);
+	setOrientation(orientation);
+}
+
+void SliderIgnoreScroll::wheelEvent(QWheelEvent *event)
+{
+	if (!hasFocus()) {
+		event->ignore();
+	} else {
+		QSlider::wheelEvent(event);
+	}
+}
+
+DoubleSlider::DoubleSlider(QWidget *parent) : SliderIgnoreScroll(parent)
+{
+	connect(this, &DoubleSlider::valueChanged, [this](int val) {
+		emit DoubleValChanged((minVal / minStep + val) * minStep);
+	});
+}
+
+void DoubleSlider::SetDoubleConstraints(double newMin, double newMax,
+					double newStep, double val)
+{
+	minVal = newMin;
+	maxVal = newMax;
+	minStep = newStep;
+
+	double total = maxVal - minVal;
+	int intMax = int(total / minStep);
+
+	setMinimum(0);
+	setMaximum(intMax);
+	setSingleStep(1);
+	SetDoubleVal(val);
+}
+
+double DoubleSlider::DoubleValue()
+{
+	return (minVal / minStep + value()) * minStep;
+}
+
+void DoubleSlider::SetDoubleVal(double val)
+{
+	setValue(lround((val - minVal) / minStep));
+}
+
+} // namespace advss