source/list.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/debug/demangle.h>
   3 #include <msp/gl/matrix.h>
   4 #include <msp/gl/meshbuilder.h>
   5 #include "graphic.h"
   6 #include "list.h"
   7 #include "part.h"
   8 #include "style.h"
   9 #include "text.h"
  10 #include "vslider.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GLtk {
  16
  17 incompatible_data::incompatible_data(const type_info &ti):
  18         logic_error("expected "+Debug::demangle(ti.name()))
  19 { }
  20
  21
  22 List::List():
  23         data(new BasicListData<string>),
  24         own_data(true)
  25 {
  26         init();
  27 }
  28
  29 List::List(ListData &d):
  30         data(&d),
  31         own_data(false)
  32 {
  33         init();
  34 }
  35
  36 void List::init()
  37 {
  38         item_factory = 0;
  39         sel_index = -1;
  40         first = 0;
  41         max_scroll = 0;
  42         view_size = 5;
  43         ignore_slider_change = false;
  44
  45         observer = new DataObserver(*this);
  46
  47         add(slider);
  48         slider.set_step(1);
  49         slider.signal_value_changed.connect(sigc::mem_fun(this, &List::slider_value_changed));
  50 }
  51
  52 List::~List()
  53 {
  54         delete item_factory;
  55         delete observer;
  56         if(own_data)
  57                 delete data;
  58 }
  59
  60 void List::autosize_special(const Part &part, Geometry &ageom) const
  61 {
  62         if(part.get_name()=="items")
  63         {
  64                 const Sides &margin = part.get_margin();
  65
  66                 unsigned max_w = 0;
  67                 unsigned total_h = 0;
  68                 for(unsigned i=0; i<items.size(); ++i)
  69                 {
  70                         Geometry igeom;
  71                         items[i]->autosize(igeom);
  72                         max_w = max(max_w, igeom.w);
  73                         if(view_size==0 || i<view_size)
  74                                 total_h += igeom.h;
  75                 }
  76
  77                 if(!items.empty() && items.size()<view_size)
  78                         total_h = total_h*view_size/items.size();
  79
  80                 ageom.w = max(ageom.w, max_w+margin.left+margin.right);
  81                 ageom.h = max(ageom.h, total_h+margin.top+margin.bottom);
  82         }
  83         else if(part.get_name()=="slider")
  84                 autosize_child(slider, part, ageom);
  85 }
  86
  87 void List::set_data(ListData &d)
  88 {
  89         if(item_factory)
  90                 item_factory->set_data(d);
  91
  92         delete observer;
  93         if(own_data)
  94                 delete data;
  95
  96         data = &d;
  97         own_data = false;
  98         observer = new DataObserver(*this);
  99
 100         for(vector<Item *>::iterator i=items.begin(); i!=items.end(); ++i)
 101                 delete *i;
 102         items.clear();
 103         unsigned n_items = data->size();
 104         for(unsigned i=0; i<n_items; ++i)
 105         {
 106                 Item *item = create_item(i);
 107                 items.push_back(item);
 108         }
 109
 110         items_changed();
 111 }
 112
 113 void List::items_changed()
 114 {
 115         signal_autosize_changed.emit();
 116         rebuild();
 117 }
 118
 119 List::Item *List::create_item(unsigned index)
 120 {
 121         Item *item = 0;
 122         if(item_factory)
 123                 item = item_factory->create_item(index);
 124         else
 125                 item = new BasicItem(data->get_string(index));
 126         if(static_cast<int>(index)==sel_index)
 127                 item->set_active(true);
 128         add(*item);
 129         item->autosize();
 130         item->signal_autosize_changed.connect(sigc::bind(sigc::mem_fun(this, &List::item_autosize_changed), item));
 131         return item;
 132 }
 133
 134 void List::set_view_size(unsigned s)
 135 {
 136         view_size = s;
 137         signal_autosize_changed.emit();
 138 }
 139
 140 void List::set_view_all()
 141 {
 142         set_view_size(0);
 143 }
 144
 145 void List::set_selected_index(int i)
 146 {
 147         if(i>=static_cast<int>(data->size()))
 148                 throw out_of_range("List::set_selected_index");
 149
 150         if(i==sel_index)
 151                 return;
 152
 153         if(sel_index>=0)
 154                 items[sel_index]->set_active(false);
 155         if(i<0)
 156                 sel_index = -1;
 157         else
 158         {
 159                 sel_index = i;
 160                 items[sel_index]->set_active(true);
 161                 signal_item_selected.emit(sel_index);
 162         }
 163 }
 164
 165 void List::rebuild_special(const Part &part)
 166 {
 167         if(part.get_name()=="slider")
 168                 reposition_child(slider, part);
 169         else if(part.get_name()=="items")
 170         {
 171                 SetFlag flag(ignore_slider_change);
 172                 check_view_range();
 173
 174                 const Sides &margin = part.get_margin();
 175                 unsigned w = geom.w-min(geom.w, margin.left+margin.right);
 176                 unsigned y = geom.h-min(geom.h, margin.top);
 177                 for(unsigned i=0; i<items.size(); ++i)
 178                 {
 179                         if(i<first || !y)
 180                                 items[i]->set_visible(false);
 181                         else
 182                         {
 183                                 Geometry igeom = items[i]->get_geometry();
 184                                 if(igeom.h+margin.bottom<=y)
 185                                 {
 186                                         items[i]->set_visible(true);
 187                                         y -= igeom.h;
 188                                         igeom.x = margin.left;
 189                                         igeom.y = y;
 190                                         igeom.w = w;
 191                                         items[i]->set_geometry(igeom);
 192                                 }
 193                                 else
 194                                 {
 195                                         items[i]->set_visible(false);
 196                                         y = 0;
 197                                 }
 198                         }
 199                 }
 200         }
 201
 202         Widget::rebuild_special(part);
 203 }
 204
 205 void List::render_special(const Part &part, GL::Renderer &renderer) const
 206 {
 207         if(part.get_name()=="items")
 208         {
 209                 for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
 210                         items[i]->render(renderer);
 211         }
 212         else if(part.get_name()=="slider")
 213                 slider.render(renderer);
 214 }
 215
 216 void List::button_press(int x, int y, unsigned btn)
 217 {
 218         if(btn==4 || btn==5)
 219         {
 220                 unsigned change = 3;
 221                 if(btn==4)
 222                 {
 223                         change = min(first, change);
 224                         slider.set_value(max_scroll-(first-change));
 225                 }
 226                 else if(btn==5)
 227                 {
 228                         change = min(max_scroll-first, change);
 229                         slider.set_value(max_scroll-(first+change));
 230                 }
 231         }
 232         else
 233         {
 234                 Container::button_press(x, y, btn);
 235                 if(click_focus && btn==1)
 236                 {
 237                         for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
 238                                 if(click_focus==items[i])
 239                                 {
 240                                         set_selected_index(i);
 241                                         break;
 242                                 }
 243                 }
 244         }
 245 }
 246
 247 void List::item_autosize_changed(Item *item)
 248 {
 249         item->autosize();
 250         signal_autosize_changed.emit();
 251         rebuild();
 252 }
 253
 254 void List::check_view_range()
 255 {
 256         if(!style)
 257                 return;
 258
 259         unsigned h = geom.h;
 260         if(const Part *items_part = style->get_part("items"))
 261         {
 262                 const Sides &margin = items_part->get_margin();
 263                 h -= margin.top+margin.bottom;
 264         }
 265
 266         max_scroll = items.size();
 267         for(unsigned i=items.size(); i-->0; )
 268         {
 269                 unsigned ih = items[i]->get_geometry().h;
 270                 if(ih<=h)
 271                 {
 272                         h -= ih;
 273                         --max_scroll;
 274                 }
 275         }
 276
 277         if(first>max_scroll)
 278                 first = max_scroll;
 279
 280         slider.set_range(0, max_scroll);
 281         slider.set_value(max_scroll-first);
 282 }
 283
 284 void List::slider_value_changed(double value)
 285 {
 286         if(max_scroll>0 && !ignore_slider_change)
 287         {
 288                 first = max_scroll-static_cast<unsigned>(value);
 289                 rebuild();
 290         }
 291 }
 292
 293
 294 List::DataObserver::DataObserver(List &l):
 295         list(l)
 296 {
 297         list.data->signal_item_added.connect(sigc::mem_fun(this, &DataObserver::item_added));
 298         list.data->signal_item_removed.connect(sigc::mem_fun(this, &DataObserver::item_removed));
 299         list.data->signal_cleared.connect(sigc::mem_fun(this, &DataObserver::cleared));
 300         list.data->signal_refresh_item.connect(sigc::mem_fun(this, &DataObserver::refresh_item));
 301 }
 302
 303 void List::DataObserver::item_added(unsigned i)
 304 {
 305         if(list.sel_index>=static_cast<int>(i))
 306                 ++list.sel_index;
 307
 308         Item *item = list.create_item(i);
 309         list.items.insert(list.items.begin()+i, item);
 310         list.items_changed();
 311 }
 312
 313 void List::DataObserver::item_removed(unsigned i)
 314 {
 315         if(list.sel_index>static_cast<int>(i))
 316                 --list.sel_index;
 317         else if(list.sel_index==static_cast<int>(i))
 318                 list.sel_index = -1;
 319
 320         delete list.items[i];
 321         list.items.erase(list.items.begin()+i);
 322         list.items_changed();
 323 }
 324
 325 void List::DataObserver::cleared()
 326 {
 327         list.sel_index = -1;
 328         for(vector<Item *>::iterator i=list.items.begin(); i!=list.items.end(); ++i)
 329                 delete *i;
 330         list.items.clear();
 331         list.items_changed();
 332 }
 333
 334 void List::DataObserver::refresh_item(unsigned i)
 335 {
 336         delete list.items[i];
 337         // Avoid stale pointer while create_item is executing
 338         list.items[i] = 0;
 339         list.items[i] = list.create_item(i);
 340         list.items_changed();
 341 }
 342
 343
 344 void List::Item::autosize_special(const Part &part, Geometry &ageom) const
 345 {
 346         if(part.get_name()=="children")
 347         {
 348                 const Sides &margin = part.get_margin();
 349                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 350                 {
 351                         Geometry cgeom;
 352                         (*i)->widget->autosize(cgeom);
 353                         ageom.w = max(ageom.w, cgeom.x+cgeom.w+margin.right);
 354                         ageom.h = max(ageom.h, cgeom.y+cgeom.h+margin.top);
 355                 }
 356         }
 357 }
 358
 359 void List::Item::set_active(bool a)
 360 {
 361         set_state(ACTIVE, (a ? ACTIVE : NORMAL));
 362 }
 363
 364 void List::Item::render_special(const Part &part, GL::Renderer &renderer) const
 365 {
 366         if(part.get_name()=="children")
 367         {
 368                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 369                         (*i)->widget->render(renderer);
 370         }
 371 }
 372
 373
 374 void List::MultiColumnItem::check_widths(vector<unsigned> &widths) const
 375 {
 376         if(widths.size()<children.size())
 377                 widths.resize(children.size(), 0);
 378
 379         unsigned n = 0;
 380         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i, ++n)
 381         {
 382                 Geometry cgeom;
 383                 (*i)->widget->autosize(cgeom);
 384                 // TODO invent a better way to specify spacings
 385                 widths[n] = max(widths[n], cgeom.w+8);
 386         }
 387 }
 388
 389 void List::MultiColumnItem::set_widths(const vector<unsigned> &widths)
 390 {
 391         if(!style)
 392                 return;
 393
 394         const Part *part = style->get_part("children");
 395         if(!part)
 396                 return;
 397
 398         const Sides &margin = part->get_margin();
 399         int x = margin.left;
 400         unsigned n = 0;
 401         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i, ++n)
 402         {
 403                 (*i)->widget->set_position(x, margin.bottom);
 404                 x += widths[n];
 405         }
 406 }
 407
 408 void List::MultiColumnItem::on_style_change()
 409 {
 410         if(!style)
 411                 return;
 412
 413         for(std::list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 414                 (*i)->widget->autosize();
 415
 416         vector<unsigned> widths;
 417         List *list = static_cast<List *>(parent);
 418         for(vector<Item *>::const_iterator i=list->items.begin(); i!=list->items.end(); ++i)
 419                 if(*i!=this)
 420                         if(MultiColumnItem *mci = dynamic_cast<MultiColumnItem *>(*i))
 421                                 mci->check_widths(widths);
 422
 423         vector<unsigned> self_widths(widths);
 424         check_widths(self_widths);
 425         bool update_all = false;
 426         for(unsigned i=0; (!update_all && i<widths.size() && i<self_widths.size()); ++i)
 427                 update_all = self_widths[i]>widths[i];
 428
 429         if(update_all)
 430         {
 431                 for(vector<Item *>::const_iterator i=list->items.begin(); i!=list->items.end(); ++i)
 432                         if(MultiColumnItem *mci = dynamic_cast<MultiColumnItem *>(*i))
 433                                 mci->set_widths(self_widths);
 434         }
 435
 436         set_widths(self_widths);
 437 }
 438
 439
 440 List::BasicItem::BasicItem(const string &text):
 441         label(text)
 442 {
 443         add(label);
 444 }
 445
 446 void List::BasicItem::on_style_change()
 447 {
 448         if(!style)
 449                 return;
 450
 451         label.autosize();
 452         if(const Part *part = style->get_part("children"))
 453         {
 454                 const Sides &margin = part->get_margin();
 455                 label.set_position(margin.left, margin.bottom);
 456         }
 457 }
 458
 459
 460 List::Loader::Loader(List &l):
 461         DataFile::DerivedObjectLoader<List, Widget::Loader>(l)
 462 {
 463         add("item", &Loader::item);
 464         add("view_size", &List::view_size);
 465 }
 466
 467 void List::Loader::item(const string &v)
 468 {
 469         dynamic_cast<BasicListData<string> &>(*obj.data).append(v);
 470 }
 471
 472 } // namespace GLtk
 473 } // namespace Msp