+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.transform(GL::Matrix::translation(sgeom.x+rgeom.x, sgeom.y+rgeom.y, 0));
+ graphic->build(rgeom.w, rgeom.h, bld);
+ }
+}
+
+void Slider::button_press(int x, int y, unsigned btn)
+{
+ if(btn!=1)
+ return;
+
+ int p = (dir==HORIZONTAL ? x : y);
+
+ p -= drag_area_offset;
+ if(p<0 || p>=static_cast<int>(drag_area_size))
+ return;
+
+ int sp = static_cast<int>((drag_area_size-slider_size)*(value-min)/(max-min));
+ if(p<sp)
+ set_value(value-page_size);
+ else if(p>=static_cast<int>(sp+slider_size))
+ set_value(value+page_size);
+ else
+ {
+ dragging = true;
+ drag_start_pos = p;
+ drag_start_value = value;
+ set_state(ACTIVE);
+ }
+}
+
+void Slider::button_release(int, int, unsigned btn)
+{
+ if(btn==1 && dragging)
+ {
+ dragging = false;
+ clear_state(ACTIVE);
+ }
+}
+
+void Slider::pointer_motion(int x, int y)
+{
+ if(dragging && max>min)
+ {
+ int p = (dir==HORIZONTAL ? x : y);
+ set_value(drag_start_value+(p-drag_start_pos)*(max-min)/(drag_area_size-slider_size));
+ }
+}
+
+void Slider::on_size_change()
+{
+ drag_area_size = (dir==HORIZONTAL ? geom.w : geom.h)-total_margin;
+}
+
+void Slider::on_style_change()
+{
+ if(!style)
+ return;
+
+ if(const Part *slider_part = style->find_part("slider"))
+ {
+ const Geometry &pgeom = slider_part->get_geometry();
+ const Sides &margin = slider_part->get_margin();
+ if(dir==HORIZONTAL)
+ {
+ slider_min_size = pgeom.w;
+ drag_area_offset = margin.left;
+ total_margin = margin.left+margin.right;
+ }
+ else
+ {
+ slider_min_size = pgeom.h;
+ drag_area_offset = margin.bottom;
+ total_margin = margin.bottom+margin.top;
+ }
+ }
+
+ on_size_change();
+}
+
+
+Slider::Loader::Loader(Slider &s):
+ DataFile::DerivedObjectLoader<Slider, Widget::Loader>(s)
+{
+ add("range", &Slider::min, &Slider::max);
+ add("step", &Slider::step);
+ add("page_size", &Slider::page_size);
+ add("value", &Slider::value);
+}
+