+ unsigned steps = static_cast<unsigned>((v-min)/step+0.5);
+ value = min+steps*step;
+ }
+
+ if(value!=old_value)
+ {
+ signal_value_changed.emit(value);
+ mark_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::set_page_size(double p)
+{
+ page_size = p;
+ mark_rebuild();
+}
+
+void Slider::autosize_special(const Part &part, Geometry &ageom) const
+{
+ if(part.get_name()=="slider")
+ {
+ const Sides &margin = part.get_margin();
+ const Geometry &pgeom = part.get_geometry();
+ ageom.w = std::max(ageom.w, pgeom.w*(dir==HORIZONTAL)/2+margin.left+margin.right);
+ ageom.h = std::max(ageom.h, pgeom.h*(dir==VERTICAL)/2+margin.top+margin.bottom);
+ }
+}
+
+void Slider::rebuild_special(const Part &part)
+{
+ if(part.get_name()=="slider")
+ {
+ const Graphic *graphic = part.get_graphic(state);
+ if(!graphic || !graphic->get_texture())
+ return;
+
+ float pos_fraction = ((max>min) ? (value-min)/(max-min) : 0);
+ float fill_fraction = ((max>min) ? page_size/(max-min+page_size) : 1);
+
+ Alignment align = part.get_alignment();
+ Geometry sgeom = geom;
+ if(dir==HORIZONTAL)
+ {
+ align.x = pos_fraction;
+ sgeom.w = std::max(slider_min_size+total_margin, static_cast<unsigned>(sgeom.w*fill_fraction));
+ }
+ else
+ {
+ align.y = pos_fraction;
+ sgeom.h = std::max(slider_min_size+total_margin, static_cast<unsigned>(sgeom.h*fill_fraction));
+ }
+
+ sgeom.x = static_cast<unsigned>((geom.w-sgeom.w)*pos_fraction);
+ sgeom.y = static_cast<unsigned>((geom.h-sgeom.h)*pos_fraction);
+
+ Geometry rgeom = part.get_geometry();
+ align.apply(rgeom, sgeom, part.get_margin());
+ slider_size = (dir==HORIZONTAL ? rgeom.w : rgeom.h);
+
+ GL::MeshBuilder bld(part_cache.create_mesh(part, *graphic->get_texture()));
+ bld.matrix() *= GL::Matrix::translation(sgeom.x+rgeom.x, sgeom.y+rgeom.y, 0);
+ graphic->build(rgeom.w, rgeom.h, bld);