source/slider.cpp

   1 #include <msp/gl/matrix.h>
   2 #include <msp/gl/meshbuilder.h>
   3 #include "graphic.h"
   4 #include "part.h"
   5 #include "slider.h"
   6 #include "style.h"
   7
   8 namespace Msp {
   9 namespace GLtk {
  10
  11 Slider::Slider(Direction d):
  12         dir(d)
  13 { }
  14
  15 void Slider::set_value(double v)
  16 {
  17         double old_value = value;
  18
  19         if(v<min)
  20                 value = min;
  21         else if(v>max)
  22                 value = max;
  23         else
  24         {
  25                 unsigned steps = static_cast<unsigned>((v-min)/step+0.5);
  26                 value = min+steps*step;
  27         }
  28
  29         if(value!=old_value)
  30         {
  31                 signal_value_changed.emit(value);
  32                 mark_rebuild();
  33         }
  34 }
  35
  36 void Slider::set_range(double a, double b)
  37 {
  38         min = a;
  39         max = b;
  40         set_value(value);
  41 }
  42
  43 void Slider::set_step(double s)
  44 {
  45         step = s;
  46         set_value(value);
  47 }
  48
  49 void Slider::set_page_size(double p)
  50 {
  51         page_size = p;
  52         mark_rebuild();
  53 }
  54
  55 void Slider::autosize_special(const Part &part, Geometry &ageom) const
  56 {
  57         if(part.get_name()=="slider")
  58         {
  59                 const Sides &margin = part.get_margin();
  60                 const Geometry &pgeom = part.get_geometry();
  61                 ageom.w = std::max(ageom.w, pgeom.w*(dir==HORIZONTAL)/2+margin.left+margin.right);
  62                 ageom.h = std::max(ageom.h, pgeom.h*(dir==VERTICAL)/2+margin.top+margin.bottom);
  63         }
  64 }
  65
  66 void Slider::rebuild_special(const Part &part)
  67 {
  68         if(part.get_name()=="slider")
  69         {
  70                 const Graphic *graphic = part.get_graphic(state);
  71                 if(!graphic || !graphic->get_texture())
  72                         return;
  73
  74                 float pos_fraction = ((max>min) ? (value-min)/(max-min) : 0);
  75                 float fill_fraction = ((max>min) ? page_size/(max-min+page_size) : 1);
  76
  77                 Alignment align = part.get_alignment();
  78                 Geometry sgeom = geom;
  79                 if(dir==HORIZONTAL)
  80                 {
  81                         align.x = pos_fraction;
  82                         sgeom.w = std::max(slider_min_size+total_margin, static_cast<unsigned>(sgeom.w*fill_fraction));
  83                 }
  84                 else
  85                 {
  86                         align.y = pos_fraction;
  87                         sgeom.h = std::max(slider_min_size+total_margin, static_cast<unsigned>(sgeom.h*fill_fraction));
  88                 }
  89
  90                 sgeom.x = static_cast<unsigned>((geom.w-sgeom.w)*pos_fraction);
  91                 sgeom.y = static_cast<unsigned>((geom.h-sgeom.h)*pos_fraction);
  92
  93                 Geometry rgeom = part.get_geometry();
  94                 align.apply(rgeom, sgeom, part.get_margin());
  95                 slider_size = (dir==HORIZONTAL ? rgeom.w : rgeom.h);
  96
  97                 GL::MeshBuilder bld(part_cache.create_mesh(part, *graphic->get_texture()));
  98                 bld.transform(GL::Matrix::translation(sgeom.x+rgeom.x, sgeom.y+rgeom.y, 0));
  99                 graphic->build(rgeom.w, rgeom.h, bld);
 100         }
 101 }
 102
 103 void Slider::button_press(int x, int y, unsigned btn)
 104 {
 105         if(btn!=1)
 106                 return;
 107
 108         int p = (dir==HORIZONTAL ? x : y);
 109
 110         p -= drag_area_offset;
 111         if(p<0 || p>=static_cast<int>(drag_area_size))
 112                 return;
 113
 114         int sp = static_cast<int>((drag_area_size-slider_size)*(value-min)/(max-min));
 115         if(p<sp)
 116                 set_value(value-page_size);
 117         else if(p>=static_cast<int>(sp+slider_size))
 118                 set_value(value+page_size);
 119         else
 120         {
 121                 dragging = true;
 122                 drag_start_pos = p;
 123                 drag_start_value = value;
 124                 set_state(ACTIVE);
 125         }
 126 }
 127
 128 void Slider::button_release(int, int, unsigned btn)
 129 {
 130         if(btn==1 && dragging)
 131         {
 132                 dragging = false;
 133                 clear_state(ACTIVE);
 134         }
 135 }
 136
 137 void Slider::pointer_motion(int x, int y)
 138 {
 139         if(dragging && max>min)
 140         {
 141                 int p = (dir==HORIZONTAL ? x : y);
 142                 set_value(drag_start_value+(p-drag_start_pos)*(max-min)/(drag_area_size-slider_size));
 143         }
 144 }
 145
 146 void Slider::on_size_change()
 147 {
 148         drag_area_size = (dir==HORIZONTAL ? geom.w : geom.h)-total_margin;
 149 }
 150
 151 void Slider::on_style_change()
 152 {
 153         if(!style)
 154                 return;
 155
 156         if(const Part *slider_part = style->find_part("slider"))
 157         {
 158                 const Geometry &pgeom = slider_part->get_geometry();
 159                 const Sides &margin = slider_part->get_margin();
 160                 if(dir==HORIZONTAL)
 161                 {
 162                         slider_min_size = pgeom.w;
 163                         drag_area_offset = margin.left;
 164                         total_margin = margin.left+margin.right;
 165                 }
 166                 else
 167                 {
 168                         slider_min_size = pgeom.h;
 169                         drag_area_offset = margin.bottom;
 170                         total_margin = margin.bottom+margin.top;
 171                 }
 172         }
 173
 174         on_size_change();
 175 }
 176
 177
 178 Slider::Loader::Loader(Slider &s):
 179         DataFile::DerivedObjectLoader<Slider, Widget::Loader>(s)
 180 {
 181         add("range", &Slider::min, &Slider::max);
 182         add("step",  &Slider::step);
 183         add("page_size", &Slider::page_size);
 184         add("value", &Slider::value);
 185 }
 186
 187 } // namespace GLtk
 188 } // namespace Msp