namespace Msp {
namespace GLtk {
-Slider::Slider(const Resources &r):
- Widget(r),
+Slider::Slider():
min(0),
max(1),
value(0),
- step(0.1)
-{
-}
+ step(0.1),
+ dragging(false),
+ drag_area_size(0)
+{ }
void Slider::set_value(double v)
{
+ double old_value = value;
+
if(v<min)
- value=min;
+ value = min;
else if(v>max)
- value=max;
+ value = max;
else
{
- unsigned steps=static_cast<unsigned>((v-min)/step+0.5);
- value=min+steps*step;
+ unsigned steps = static_cast<unsigned>((v-min)/step+0.5);
+ value = min+steps*step;
}
+
+ if(value!=old_value)
+ {
+ signal_value_changed.emit(value);
+ rebuild();
+ }
+}
+
+void Slider::set_range(double a, double b)
+{
+ min = a;
+ max = b;
+ set_value(value);
+}
+
+void Slider::set_step(double s)
+{
+ step = s;
+ set_value(value);
+}
+
+void Slider::start_drag(int p)
+{
+ dragging = true;
+ drag_start_pos = p;
+ drag_start_value = value;
+ set_state(ACTIVE);
+}
+
+void Slider::drag(int p)
+{
+ if(max>min)
+ set_value(drag_start_value+(p-drag_start_pos)*(max-min)/drag_area_size);
+}
+
+void Slider::end_drag()
+{
+ dragging = false;
+ clear_state(ACTIVE);
+}
+
+
+Slider::Loader::Loader(Slider &s):
+ DataFile::DerivedObjectLoader<Slider, Widget::Loader>(s)
+{
+ add("range", &Slider::min, &Slider::max);
+ add("step", &Slider::step);
+ add("value", &Slider::value);
}
} // namespace GLtk