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 List::~List()
  37 {
  38         delete slider;
  39 }
  40
  41 void List::append(const string &v)
  42 {
  43         items.push_back(v);
  44         recalculate_parameters();
  45 }
  46
  47 void List::insert(unsigned i, const string &v)
  48 {
  49         if(i>items.size())
  50                 throw InvalidParameterValue("Index out of range");
  51
  52         items.insert(items.begin()+i, v);
  53         recalculate_parameters();
  54 }
  55
  56 void List::remove(unsigned i)
  57 {
  58         if(i>items.size())
  59                 throw InvalidParameterValue("Index out of range");
  60
  61         items.erase(items.begin()+i);
  62         if(sel_index>static_cast<int>(i))
  63                 --sel_index;
  64         else if(sel_index==static_cast<int>(i))
  65                 sel_index=-1;
  66
  67         recalculate_parameters();
  68 }
  69
  70 void List::clear()
  71 {
  72         items.clear();
  73         sel_index=-1;
  74 }
  75
  76 void List::set_selected_index(int i)
  77 {
  78         if(i<0)
  79                 sel_index=-1;
  80         else if(i<static_cast<int>(items.size()))
  81         {
  82                 sel_index=i;
  83                 signal_item_selected.emit(sel_index, items[sel_index]);
  84         }
  85         else
  86                 throw InvalidParameterValue("Index out of range");
  87 }
  88
  89 const string &List::get_selected() const
  90 {
  91         if(sel_index<0)
  92                 throw InvalidState("No selection");
  93
  94         return items[sel_index];
  95 }
  96
  97 void List::button_press(int x, int y, unsigned btn)
  98 {
  99         if(slider->get_geometry().is_inside(x, y))
 100         {
 101                 const Geometry &sgeom=slider->get_geometry();
 102                 slider->button_press(x-sgeom.x, y-sgeom.y, btn);
 103                 slider_active=true;
 104         }
 105         else if(btn==1)
 106         {
 107                 const GL::Font *const font=style->get_font();
 108                 const unsigned row_height=static_cast<unsigned>(font->get_default_size());
 109
 110                 if(items_part)
 111                         y+=items_part->get_margin().top;
 112
 113                 unsigned i=(geom.h-1-y)/row_height;
 114                 if(i<n_visible && first+i<items.size())
 115                 {
 116                         sel_index=first+i;
 117
 118                         signal_item_selected.emit(sel_index, items[sel_index]);
 119                 }
 120         }
 121 }
 122
 123 void List::button_release(int x, int y, unsigned btn)
 124 {
 125         if(slider_active)
 126         {
 127                 const Geometry &sgeom=slider->get_geometry();
 128                 slider->button_release(x-sgeom.x, y-sgeom.y, btn);
 129                 slider_active=false;
 130         }
 131 }
 132
 133 void List::pointer_motion(int x, int y)
 134 {
 135         if(slider_active)
 136         {
 137                 const Geometry &sgeom=slider->get_geometry();
 138                 slider->pointer_motion(x-sgeom.x, y-sgeom.y);
 139         }
 140 }
 141
 142 void List::render_special(const Part &part) const
 143 {
 144         if(part.get_name()=="items")
 145         {
 146                 const GL::Font *const font=style->get_font();
 147                 const float font_size=font->get_default_size();
 148                 const unsigned row_height=static_cast<unsigned>(font_size);
 149                 const Sides &margin=part.get_margin();
 150
 151                 Geometry pgeom=geom;
 152                 pgeom.h=row_height;
 153                 pgeom.w-=margin.left+margin.right;
 154
 155                 for(unsigned i=0; (i<n_visible && first+i<items.size()); ++i)
 156                 {
 157                         Geometry rgeom;
 158                         rgeom.w=static_cast<unsigned>(font->get_string_width(items[first+i])*font_size);
 159                         rgeom.h=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
 160                         rgeom.y=geom.h-margin.top-(i+1)*row_height-static_cast<int>(font->get_descent()*font_size);
 161                         part.get_alignment().apply(rgeom, pgeom);
 162
 163                         GL::push_matrix();
 164                         GL::translate(rgeom.x, rgeom.y, 0);
 165                         GL::scale_uniform(font_size);
 166                         font->draw_string(items[first+i]);
 167                         GL::pop_matrix();
 168                 }
 169         }
 170         else if(part.get_name()=="selection")
 171         {
 172                 if(sel_index>=static_cast<int>(first) && sel_index<static_cast<int>(first+n_visible))
 173                 {
 174                         const GL::Font *const font=style->get_font();
 175                         const float font_size=font->get_default_size();
 176                         const unsigned row_height=static_cast<unsigned>(font_size);
 177                         const Sides &margin=part.get_margin();
 178
 179                         Geometry pgeom=geom;
 180                         pgeom.h=row_height;
 181                         pgeom.w-=margin.left+margin.right;
 182
 183                         Geometry rgeom=part.get_geometry();
 184                         rgeom.y+=geom.h-margin.top-row_height*(sel_index-first+1);
 185                         rgeom.x+=margin.left;
 186                         part.get_alignment().apply(rgeom, pgeom);
 187
 188                         GL::push_matrix();
 189                         GL::translate(rgeom.x, rgeom.y, 0);
 190                         part.get_graphic(state)->render(rgeom.w, rgeom.h);
 191                         GL::pop_matrix();
 192                 }
 193         }
 194         else if(part.get_name()=="slider")
 195                 slider->render();
 196 }
 197
 198 void List::on_geometry_change()
 199 {
 200         reposition_slider();
 201
 202         recalculate_parameters();
 203 }
 204
 205 void List::on_style_change()
 206 {
 207         reposition_slider();
 208
 209         items_part=0;
 210         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 211                 if(i->get_name()=="items")
 212                         items_part=&*i;
 213
 214         recalculate_parameters();
 215 }
 216
 217 void List::reposition_slider()
 218 {
 219         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 220                 if(i->get_name()=="slider")
 221                 {
 222                         Geometry sgeom=i->get_geometry();
 223                         i->get_alignment().apply(sgeom, geom, i->get_margin());
 224                         slider->set_geometry(sgeom);
 225                 }
 226 }
 227
 228 void List::recalculate_parameters()
 229 {
 230         const GL::Font *font=style->get_font();
 231         unsigned row_height=static_cast<unsigned>(font->get_default_size());
 232
 233         unsigned h=geom.h;
 234         if(items_part)
 235         {
 236                 const Sides &margin=items_part->get_margin();
 237                 h-=margin.top+margin.bottom;
 238         }
 239
 240         n_visible=h/row_height;
 241
 242         if(first+n_visible>items.size())
 243         {
 244                 if(items.size()>n_visible)
 245                         first=items.size()-n_visible;
 246                 else
 247                         first=0;
 248         }
 249
 250         if(items.size()>n_visible)
 251         {
 252                 slider->set_range(0, items.size()-n_visible);
 253                 slider->set_value(items.size()-n_visible-first);
 254         }
 255         else
 256         {
 257                 slider->set_range(0, 0);
 258                 slider->set_value(0);
 259         }
 260 }
 261
 262 void List::slider_value_changed(double value)
 263 {
 264         first=items.size()-n_visible-static_cast<unsigned>(value);
 265 }
 266
 267
 268 List::Loader::Loader(List &l):
 269         Widget::Loader(l)
 270 {
 271         add("item", &Loader::item);
 272 }
 273
 274 void List::Loader::item(const string &v)
 275 {
 276         static_cast<List &>(wdg).append(v);
 277 }
 278
 279 } // namespace GLtk
 280 } // namespace Msp