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