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