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         min(0),
  14         max(1),
  15         value(0),
  16         step(0.1),
  17         page_size(0.25),
  18         dragging(false),
  19         drag_area_size(0),
  20         drag_area_offset(0),
  21         slider_min_size(1),
  22         slider_size(1),
  23         total_margin(0)
  24 { }
  25
  26 void Slider::set_value(double v)
  27 {
  28         double old_value = value;
  29
  30         if(v<min)
  31                 value = min;
  32         else if(v>max)
  33                 value = max;
  34         else
  35         {
  36                 unsigned steps = static_cast<unsigned>((v-min)/step+0.5);
  37                 value = min+steps*step;
  38         }
  39
  40         if(value!=old_value)
  41         {
  42                 signal_value_changed.emit(value);
  43                 mark_rebuild();
  44         }
  45 }
  46
  47 void Slider::set_range(double a, double b)
  48 {
  49         min = a;
  50         max = b;
  51         set_value(value);
  52 }
  53
  54 void Slider::set_step(double s)
  55 {
  56         step = s;
  57         set_value(value);
  58 }
  59
  60 void Slider::set_page_size(double p)
  61 {
  62         page_size = p;
  63         mark_rebuild();
  64 }
  65
  66 void Slider::autosize_special(const Part &part, Geometry &ageom) const
  67 {
  68         if(part.get_name()=="slider")
  69         {
  70                 const Sides &margin = part.get_margin();
  71                 const Geometry &pgeom = part.get_geometry();
  72                 ageom.w = std::max(ageom.w, pgeom.w*(dir==HORIZONTAL)/2+margin.left+margin.right);
  73                 ageom.h = std::max(ageom.h, pgeom.h*(dir==VERTICAL)/2+margin.top+margin.bottom);
  74         }
  75 }
  76
  77 void Slider::rebuild_special(const Part &part)
  78 {
  79         if(part.get_name()=="slider")
  80         {
  81                 const Graphic *graphic = part.get_graphic(state);
  82                 if(!graphic || !graphic->get_texture())
  83                         return;
  84
  85                 float pos_fraction = ((max>min) ? (value-min)/(max-min) : 0);
  86                 float fill_fraction = ((max>min) ? page_size/(max-min+page_size) : 1);
  87
  88                 Alignment align = part.get_alignment();
  89                 Geometry sgeom = geom;
  90                 if(dir==HORIZONTAL)
  91                 {
  92                         align.x = pos_fraction;
  93                         sgeom.w = std::max(slider_min_size+total_margin, static_cast<unsigned>(sgeom.w*fill_fraction));
  94                 }
  95                 else
  96                 {
  97                         align.y = pos_fraction;
  98                         sgeom.h = std::max(slider_min_size+total_margin, static_cast<unsigned>(sgeom.h*fill_fraction));
  99                 }
 100
 101                 sgeom.x = static_cast<unsigned>((geom.w-sgeom.w)*pos_fraction);
 102                 sgeom.y = static_cast<unsigned>((geom.h-sgeom.h)*pos_fraction);
 103
 104                 Geometry rgeom = part.get_geometry();
 105                 align.apply(rgeom, sgeom, part.get_margin());
 106                 slider_size = (dir==HORIZONTAL ? rgeom.w : rgeom.h);
 107
 108                 GL::MeshBuilder bld(part_cache.create_mesh(part, *graphic->get_texture()));
 109                 bld.transform(GL::Matrix::translation(sgeom.x+rgeom.x, sgeom.y+rgeom.y, 0));
 110                 graphic->build(rgeom.w, rgeom.h, bld);
 111         }
 112 }
 113
 114 void Slider::button_press(int x, int y, unsigned btn)
 115 {
 116         if(btn!=1)
 117                 return;
 118
 119         int p = (dir==HORIZONTAL ? x : y);
 120
 121         p -= drag_area_offset;
 122         if(p<0 || p>=static_cast<int>(drag_area_size))
 123                 return;
 124
 125         int sp = static_cast<int>((drag_area_size-slider_size)*(value-min)/(max-min));
 126         if(p<sp)
 127                 set_value(value-page_size);
 128         else if(p>=static_cast<int>(sp+slider_size))
 129                 set_value(value+page_size);
 130         else
 131         {
 132                 dragging = true;
 133                 drag_start_pos = p;
 134                 drag_start_value = value;
 135                 set_state(ACTIVE);
 136         }
 137 }
 138
 139 void Slider::button_release(int, int, unsigned btn)
 140 {
 141         if(btn==1 && dragging)
 142         {
 143                 dragging = false;
 144                 clear_state(ACTIVE);
 145         }
 146 }
 147
 148 void Slider::pointer_motion(int x, int y)
 149 {
 150         if(dragging && max>min)
 151         {
 152                 int p = (dir==HORIZONTAL ? x : y);
 153                 set_value(drag_start_value+(p-drag_start_pos)*(max-min)/(drag_area_size-slider_size));
 154         }
 155 }
 156
 157 void Slider::on_size_change()
 158 {
 159         drag_area_size = (dir==HORIZONTAL ? geom.w : geom.h)-total_margin;
 160 }
 161
 162 void Slider::on_style_change()
 163 {
 164         if(!style)
 165                 return;
 166
 167         if(const Part *slider_part = style->get_part("slider"))
 168         {
 169                 const Geometry &pgeom = slider_part->get_geometry();
 170                 const Sides &margin = slider_part->get_margin();
 171                 if(dir==HORIZONTAL)
 172                 {
 173                         slider_min_size = pgeom.w;
 174                         drag_area_offset = margin.left;
 175                         total_margin = margin.left+margin.right;
 176                 }
 177                 else
 178                 {
 179                         slider_min_size = pgeom.h;
 180                         drag_area_offset = margin.bottom;
 181                         total_margin = margin.bottom+margin.top;
 182                 }
 183         }
 184
 185         on_size_change();
 186 }
 187
 188
 189 Slider::Loader::Loader(Slider &s):
 190         DataFile::DerivedObjectLoader<Slider, Widget::Loader>(s)
 191 {
 192         add("range", &Slider::min, &Slider::max);
 193         add("step",  &Slider::step);
 194         add("page_size", &Slider::page_size);
 195         add("value", &Slider::value);
 196 }
 197
 198 } // namespace GLtk
 199 } // namespace Msp