source/list.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/matrix.h>
   9 #include <msp/gl/transform.h>
  10 #include "graphic.h"
  11 #include "list.h"
  12 #include "part.h"
  13 #include "style.h"
  14 #include "vslider.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GLtk {
  20
  21 List::List(const Resources &r):
  22         Widget(r),
  23         sel_index(-1),
  24         first(0),
  25         n_visible(1),
  26         items_part(0),
  27         slider(new VSlider(res)),
  28         slider_active(false)
  29 {
  30         slider->set_step(1);
  31         slider->signal_value_changed.connect(sigc::mem_fun(this, &List::slider_value_changed));
  32
  33         update_style();
  34 }
  35
  36 void List::append(const string &v)
  37 {
  38         items.push_back(v);
  39         recalculate_parameters();
  40 }
  41
  42 void List::insert(unsigned i, const string &v)
  43 {
  44         if(i>items.size())
  45                 throw InvalidParameterValue("Index out of range");
  46
  47         items.insert(items.begin()+i, v);
  48         recalculate_parameters();
  49 }
  50
  51 void List::remove(unsigned i)
  52 {
  53         if(i>items.size())
  54                 throw InvalidParameterValue("Index out of range");
  55
  56         items.erase(items.begin()+i);
  57         if(sel_index>static_cast<int>(i))
  58                 --sel_index;
  59         else if(sel_index==static_cast<int>(i))
  60                 sel_index=-1;
  61
  62         recalculate_parameters();
  63 }
  64
  65 void List::clear()
  66 {
  67         items.clear();
  68         sel_index=-1;
  69 }
  70
  71 const string &List::get_selected() const
  72 {
  73         if(sel_index<0)
  74                 throw InvalidState("No selection");
  75
  76         return items[sel_index];
  77 }
  78
  79 void List::button_press(int x, int y, unsigned btn)
  80 {
  81         if(slider->get_geometry().is_inside(x, y))
  82         {
  83                 const Geometry &sgeom=slider->get_geometry();
  84                 slider->button_press(x-sgeom.x, y-sgeom.y, btn);
  85                 slider_active=true;
  86         }
  87         else if(btn==1)
  88         {
  89                 const GL::Font *const font=style->get_font();
  90                 const unsigned row_height=static_cast<unsigned>(font->get_default_size());
  91
  92                 if(items_part)
  93                         y+=items_part->get_margin().top;
  94
  95                 unsigned i=(geom.h-1-y)/row_height;
  96                 if(i<n_visible)
  97                 {
  98                         sel_index=first+i;
  99
 100                         signal_item_selected.emit(sel_index, items[sel_index]);
 101                 }
 102         }
 103 }
 104
 105 void List::button_release(int x, int y, unsigned btn)
 106 {
 107         if(slider_active)
 108         {
 109                 const Geometry &sgeom=slider->get_geometry();
 110                 slider->button_release(x-sgeom.x, y-sgeom.y, btn);
 111                 slider_active=false;
 112         }
 113 }
 114
 115 void List::pointer_motion(int x, int y)
 116 {
 117         if(slider_active)
 118         {
 119                 const Geometry &sgeom=slider->get_geometry();
 120                 slider->pointer_motion(x-sgeom.x, y-sgeom.y);
 121         }
 122 }
 123
 124 void List::render_special(const Part &part) const
 125 {
 126         if(part.get_name()=="items")
 127         {
 128                 const GL::Font *const font=style->get_font();
 129                 const float font_size=font->get_default_size();
 130                 const unsigned row_height=static_cast<unsigned>(font_size);
 131                 const Sides &margin=part.get_margin();
 132
 133                 Geometry pgeom=geom;
 134                 pgeom.h=row_height;
 135
 136                 for(unsigned i=0; (i<n_visible && first+i<items.size()); ++i)
 137                 {
 138                         Geometry rgeom;
 139                         rgeom.w=static_cast<unsigned>(font->get_string_width(items[first+i])*font_size);
 140                         rgeom.h=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
 141                         rgeom.y=geom.h-margin.top-(i+1)*row_height-static_cast<int>(font->get_descent()*font_size);
 142                         part.get_alignment().apply(rgeom, pgeom);
 143
 144                         GL::push_matrix();
 145                         GL::translate(rgeom.x, rgeom.y, 0);
 146                         GL::scale_uniform(font_size);
 147                         font->draw_string(items[first+i]);
 148                         GL::pop_matrix();
 149                 }
 150         }
 151         else if(part.get_name()=="selection")
 152         {
 153                 if(sel_index>=static_cast<int>(first) && sel_index<static_cast<int>(first+n_visible))
 154                 {
 155                         const GL::Font *const font=style->get_font();
 156                         const float font_size=font->get_default_size();
 157                         const unsigned row_height=static_cast<unsigned>(font_size);
 158                         const Sides &margin=part.get_margin();
 159
 160                         Geometry pgeom=geom;
 161                         pgeom.h=row_height;
 162                         pgeom.w-=margin.left+margin.right;
 163
 164                         Geometry rgeom=part.get_geometry();
 165                         rgeom.y+=geom.h-margin.top-row_height*(sel_index-first+1);
 166                         rgeom.x+=margin.left;
 167                         part.get_alignment().apply(rgeom, pgeom);
 168
 169                         GL::push_matrix();
 170                         GL::translate(rgeom.x, rgeom.y, 0);
 171                         part.get_graphic(state)->render(rgeom.w, rgeom.h);
 172                         GL::pop_matrix();
 173                 }
 174         }
 175         else if(part.get_name()=="slider")
 176                 slider->render();
 177 }
 178
 179 void List::on_geometry_change()
 180 {
 181         reposition_slider();
 182
 183         recalculate_parameters();
 184 }
 185
 186 void List::on_style_change()
 187 {
 188         reposition_slider();
 189
 190         items_part=0;
 191         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 192                 if(i->get_name()=="items")
 193                         items_part=&*i;
 194
 195         recalculate_parameters();
 196 }
 197
 198 void List::reposition_slider()
 199 {
 200         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 201                 if(i->get_name()=="slider")
 202                 {
 203                         Geometry sgeom=i->get_geometry();
 204                         i->get_alignment().apply(sgeom, geom, i->get_margin());
 205                         slider->set_geometry(sgeom);
 206                 }
 207 }
 208
 209 void List::recalculate_parameters()
 210 {
 211         const GL::Font *font=style->get_font();
 212         unsigned row_height=static_cast<unsigned>(font->get_default_size());
 213
 214         unsigned h=geom.h;
 215         if(items_part)
 216         {
 217                 const Sides &margin=items_part->get_margin();
 218                 h-=margin.top+margin.bottom;
 219         }
 220
 221         n_visible=h/row_height;
 222
 223         if(first+n_visible>items.size())
 224         {
 225                 if(items.size()>n_visible)
 226                         first=items.size()-n_visible;
 227                 else
 228                         first=0;
 229         }
 230
 231         if(items.size()>n_visible)
 232         {
 233                 slider->set_range(0, items.size()-n_visible);
 234                 slider->set_value(items.size()-n_visible-first);
 235         }
 236         else
 237         {
 238                 slider->set_range(0, 0);
 239                 slider->set_value(0);
 240         }
 241 }
 242
 243 void List::slider_value_changed(double value)
 244 {
 245         first=items.size()-n_visible-static_cast<unsigned>(value);
 246 }
 247
 248
 249 List::Loader::Loader(List &l):
 250         Widget::Loader(l)
 251 {
 252         add("item", &Loader::item);
 253 }
 254
 255 void List::Loader::item(const string &v)
 256 {
 257         static_cast<List &>(wdg).append(v);
 258 }
 259
 260 } // namespace GLtk
 261 } // namespace Msp