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         recalculate_parameters();
  76 }
  77
  78 void List::set_selected_index(int i)
  79 {
  80         if(i<0)
  81                 sel_index=-1;
  82         else if(i<static_cast<int>(items.size()))
  83         {
  84                 sel_index=i;
  85                 signal_item_selected.emit(sel_index, items[sel_index]);
  86         }
  87         else
  88                 throw InvalidParameterValue("Index out of range");
  89 }
  90
  91 const string &List::get_selected() const
  92 {
  93         if(sel_index<0)
  94                 throw InvalidState("No selection");
  95
  96         return items[sel_index];
  97 }
  98
  99 void List::button_press(int x, int y, unsigned btn)
 100 {
 101         if(slider->get_geometry().is_inside(x, y))
 102         {
 103                 const Geometry &sgeom=slider->get_geometry();
 104                 slider->button_press(x-sgeom.x, y-sgeom.y, btn);
 105                 slider_active=true;
 106         }
 107         else if(btn==1)
 108         {
 109                 const GL::Font *const font=style->get_font();
 110                 const unsigned row_height=static_cast<unsigned>(font->get_default_size());
 111
 112                 if(items_part)
 113                         y+=items_part->get_margin().top;
 114
 115                 unsigned i=(geom.h-1-y)/row_height;
 116                 if(i<n_visible && first+i<items.size())
 117                 {
 118                         sel_index=first+i;
 119
 120                         signal_item_selected.emit(sel_index, items[sel_index]);
 121                 }
 122         }
 123 }
 124
 125 void List::button_release(int x, int y, unsigned btn)
 126 {
 127         if(slider_active)
 128         {
 129                 const Geometry &sgeom=slider->get_geometry();
 130                 slider->button_release(x-sgeom.x, y-sgeom.y, btn);
 131                 slider_active=false;
 132         }
 133 }
 134
 135 void List::pointer_motion(int x, int y)
 136 {
 137         if(slider_active)
 138         {
 139                 const Geometry &sgeom=slider->get_geometry();
 140                 slider->pointer_motion(x-sgeom.x, y-sgeom.y);
 141         }
 142 }
 143
 144 void List::render_special(const Part &part) const
 145 {
 146         if(part.get_name()=="items")
 147         {
 148                 const GL::Font *const font=style->get_font();
 149                 const float font_size=font->get_default_size();
 150                 const unsigned row_height=static_cast<unsigned>(font_size);
 151                 const Sides &margin=part.get_margin();
 152
 153                 Geometry pgeom=geom;
 154                 pgeom.h=row_height;
 155                 pgeom.w-=margin.left+margin.right;
 156
 157                 for(unsigned i=0; (i<n_visible && first+i<items.size()); ++i)
 158                 {
 159                         Geometry rgeom;
 160                         rgeom.w=static_cast<unsigned>(font->get_string_width(items[first+i])*font_size);
 161                         rgeom.h=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
 162                         rgeom.y=geom.h-margin.top-(i+1)*row_height-static_cast<int>(font->get_descent()*font_size);
 163                         part.get_alignment().apply(rgeom, pgeom);
 164
 165                         GL::push_matrix();
 166                         GL::translate(rgeom.x, rgeom.y, 0);
 167                         GL::scale_uniform(font_size);
 168                         font->draw_string(items[first+i]);
 169                         GL::pop_matrix();
 170                 }
 171         }
 172         else if(part.get_name()=="selection")
 173         {
 174                 if(sel_index>=static_cast<int>(first) && sel_index<static_cast<int>(first+n_visible))
 175                 {
 176                         const GL::Font *const font=style->get_font();
 177                         const float font_size=font->get_default_size();
 178                         const unsigned row_height=static_cast<unsigned>(font_size);
 179                         const Sides &margin=part.get_margin();
 180
 181                         Geometry pgeom=geom;
 182                         pgeom.h=row_height;
 183                         pgeom.w-=margin.left+margin.right;
 184
 185                         Geometry rgeom=part.get_geometry();
 186                         rgeom.y+=geom.h-margin.top-row_height*(sel_index-first+1);
 187                         rgeom.x+=margin.left;
 188                         part.get_alignment().apply(rgeom, pgeom);
 189
 190                         GL::push_matrix();
 191                         GL::translate(rgeom.x, rgeom.y, 0);
 192                         part.get_graphic(state)->render(rgeom.w, rgeom.h);
 193                         GL::pop_matrix();
 194                 }
 195         }
 196         else if(part.get_name()=="slider")
 197                 slider->render();
 198 }
 199
 200 void List::on_geometry_change()
 201 {
 202         reposition_slider();
 203
 204         recalculate_parameters();
 205 }
 206
 207 void List::on_style_change()
 208 {
 209         reposition_slider();
 210
 211         items_part=0;
 212         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 213                 if(i->get_name()=="items")
 214                         items_part=&*i;
 215
 216         recalculate_parameters();
 217 }
 218
 219 void List::reposition_slider()
 220 {
 221         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 222                 if(i->get_name()=="slider")
 223                 {
 224                         Geometry sgeom=i->get_geometry();
 225                         i->get_alignment().apply(sgeom, geom, i->get_margin());
 226                         slider->set_geometry(sgeom);
 227                 }
 228 }
 229
 230 void List::recalculate_parameters()
 231 {
 232         const GL::Font *font=style->get_font();
 233         unsigned row_height=static_cast<unsigned>(font->get_default_size());
 234
 235         unsigned h=geom.h;
 236         if(items_part)
 237         {
 238                 const Sides &margin=items_part->get_margin();
 239                 h-=margin.top+margin.bottom;
 240         }
 241
 242         n_visible=h/row_height;
 243
 244         if(first+n_visible>items.size())
 245         {
 246                 if(items.size()>n_visible)
 247                         first=items.size()-n_visible;
 248                 else
 249                         first=0;
 250         }
 251
 252         if(items.size()>n_visible)
 253         {
 254                 slider->set_range(0, items.size()-n_visible);
 255                 slider->set_value(items.size()-n_visible-first);
 256         }
 257         else
 258         {
 259                 slider->set_range(0, 0);
 260                 slider->set_value(0);
 261         }
 262 }
 263
 264 void List::slider_value_changed(double value)
 265 {
 266         if(items.size()>n_visible)
 267                 first=items.size()-n_visible-static_cast<unsigned>(value);
 268 }
 269
 270
 271 List::Loader::Loader(List &l):
 272         Widget::Loader(l)
 273 {
 274         add("item", &Loader::item);
 275 }
 276
 277 void List::Loader::item(const string &v)
 278 {
 279         static_cast<List &>(wdg).append(v);
 280 }
 281
 282 } // namespace GLtk
 283 } // namespace Msp