slider: use cursor-less drag when no multipliers are active

app/widget/slider/sliderbase.cpp

@@ -212,6 +212,11 @@ QString SliderBase::GetFormat() const
   }
 }
 
+bool SliderBase::UsingLadders() const
+{
+  return ladder_element_count_ > 0 && Config::Current()[QStringLiteral("UseSliderLadders")].toBool();
+}
+
 void SliderBase::UpdateLabel(const QVariant &v)
 {
   if (tristate_) {
@@ -303,7 +308,7 @@ void SliderBase::LadderDragged(int value, double multiplier)
 
     drag_ladder_->SetValue(ValueToString(clamped_temp_dragged_value_));
 
-    if (!Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+    if (!UsingLadders()) {
       RepositionLadder();
     }
 
@@ -394,7 +399,7 @@ void SliderBase::ResetValue()
 void SliderBase::RepositionLadder()
 {
   if (drag_ladder_) {
-    if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+    if (UsingLadders()) {
       drag_ladder_->move(QCursor::pos() - QPoint(drag_ladder_->width()/2, drag_ladder_->height()/2));
     } else {
       QPoint label_global_pos = label_->mapToGlobal(label_->pos());

app/widget/slider/sliderbase.h

@@ -101,6 +101,8 @@ private:
 
   QString GetFormat() const;
 
+  bool UsingLadders() const;
+
   SliderLabel* label_;
 
   FocusableLineEdit* editor_;

app/widget/slider/sliderladder.cpp

@@ -76,7 +76,7 @@ SliderLadder::SliderLadder(double drag_multiplier, int nb_outer_values, QWidget*
   drag_timer_.setInterval(10);
   connect(&drag_timer_, &QTimer::timeout, this, &SliderLadder::TimerUpdate);
 
-  if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+  if (UsingLadders()) {
     drag_start_x_ = -1;
   } else {
 #if defined(Q_OS_MAC)
@@ -94,7 +94,7 @@ SliderLadder::SliderLadder(double drag_multiplier, int nb_outer_values, QWidget*
 
 SliderLadder::~SliderLadder()
 {
-  if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+  if (UsingLadders()) {
 
   } else {
 #if defined(Q_OS_MAC)
@@ -142,7 +142,7 @@ void SliderLadder::TimerUpdate()
   int ladder_right = this->x() + this->width() - 1;
   int now_pos = QCursor::pos().x();
 
-  if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+  if (UsingLadders()) {
 
     bool is_under_mouse = (now_pos >= ladder_left && now_pos <= ladder_right);
 
@@ -226,6 +226,11 @@ void SliderLadder::TimerUpdate()
   }
 }
 
+bool SliderLadder::UsingLadders() const
+{
+  return elements_.size() > 1;
+}
+
 SliderLadderElement::SliderLadderElement(const double &multiplier, QWidget *parent) :
   QWidget(parent),
   multiplier_(multiplier),

app/widget/slider/sliderladder.h

@@ -83,6 +83,8 @@ signals:
   void Released();
 
 private:
+  bool UsingLadders() const;
+
   int drag_start_x_;
   int drag_start_y_;