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 || (i<0 && sel_index<0))
 151                 return;
 152
 153         if(sel_index>=0)
 154                 items[sel_index]->set_active(false);
 155         if(i<0)
 156         {
 157                 sel_index = -1;
 158                 signal_selection_cleared.emit();
 159         }
 160         else
 161         {
 162                 sel_index = i;
 163                 items[sel_index]->set_active(true);
 164                 signal_item_selected.emit(sel_index);
 165         }
 166 }
 167
 168 void List::rebuild_special(const Part &part)
 169 {
 170         if(part.get_name()=="slider")
 171                 reposition_child(slider, part);
 172         else if(part.get_name()=="items")
 173         {
 174                 SetFlag flag(ignore_slider_change);
 175                 check_view_range();
 176
 177                 const Sides &margin = part.get_margin();
 178                 unsigned w = geom.w-min(geom.w, margin.left+margin.right);
 179                 unsigned y = geom.h-min(geom.h, margin.top);
 180                 for(unsigned i=0; i<items.size(); ++i)
 181                 {
 182                         if(i<first || !y)
 183                                 items[i]->set_visible(false);
 184                         else
 185                         {
 186                                 Geometry igeom = items[i]->get_geometry();
 187                                 if(igeom.h+margin.bottom<=y)
 188                                 {
 189                                         items[i]->set_visible(true);
 190                                         y -= igeom.h;
 191                                         igeom.x = margin.left;
 192                                         igeom.y = y;
 193                                         igeom.w = w;
 194                                         items[i]->set_geometry(igeom);
 195                                 }
 196                                 else
 197                                 {
 198                                         items[i]->set_visible(false);
 199                                         y = 0;
 200                                 }
 201                         }
 202                 }
 203         }
 204
 205         Widget::rebuild_special(part);
 206 }
 207
 208 void List::render_special(const Part &part, GL::Renderer &renderer) const
 209 {
 210         if(part.get_name()=="items")
 211         {
 212                 for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
 213                         items[i]->render(renderer);
 214         }
 215         else if(part.get_name()=="slider")
 216                 slider.render(renderer);
 217 }
 218
 219 void List::button_press(int x, int y, unsigned btn)
 220 {
 221         if(btn==4 || btn==5)
 222         {
 223                 unsigned change = 3;
 224                 if(btn==4)
 225                 {
 226                         change = min(first, change);
 227                         slider.set_value(max_scroll-(first-change));
 228                 }
 229                 else if(btn==5)
 230                 {
 231                         change = min(max_scroll-first, change);
 232                         slider.set_value(max_scroll-(first+change));
 233                 }
 234         }
 235         else
 236         {
 237                 Container::button_press(x, y, btn);
 238                 if(click_focus && btn==1)
 239                 {
 240                         for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
 241                                 if(click_focus==items[i])
 242                                 {
 243                                         set_selected_index(i);
 244                                         break;
 245                                 }
 246                 }
 247         }
 248 }
 249
 250 void List::item_autosize_changed(Item *item)
 251 {
 252         item->autosize();
 253         signal_autosize_changed.emit();
 254         rebuild();
 255 }
 256
 257 void List::check_view_range()
 258 {
 259         if(!style)
 260                 return;
 261
 262         unsigned h = geom.h;
 263         if(const Part *items_part = style->get_part("items"))
 264         {
 265                 const Sides &margin = items_part->get_margin();
 266                 h -= margin.top+margin.bottom;
 267         }
 268
 269         max_scroll = items.size();
 270         for(unsigned i=items.size(); i-->0; )
 271         {
 272                 unsigned ih = items[i]->get_geometry().h;
 273                 if(ih<=h)
 274                 {
 275                         h -= ih;
 276                         --max_scroll;
 277                 }
 278         }
 279
 280         if(first>max_scroll)
 281                 first = max_scroll;
 282
 283         slider.set_range(0, max_scroll);
 284         slider.set_value(max_scroll-first);
 285 }
 286
 287 void List::slider_value_changed(double value)
 288 {
 289         if(max_scroll>0 && !ignore_slider_change)
 290         {
 291                 first = max_scroll-static_cast<unsigned>(value);
 292                 rebuild();
 293         }
 294 }
 295
 296
 297 List::DataObserver::DataObserver(List &l):
 298         list(l)
 299 {
 300         list.data->signal_item_added.connect(sigc::mem_fun(this, &DataObserver::item_added));
 301         list.data->signal_item_removed.connect(sigc::mem_fun(this, &DataObserver::item_removed));
 302         list.data->signal_cleared.connect(sigc::mem_fun(this, &DataObserver::cleared));
 303         list.data->signal_refresh_item.connect(sigc::mem_fun(this, &DataObserver::refresh_item));
 304 }
 305
 306 void List::DataObserver::item_added(unsigned i)
 307 {
 308         if(list.sel_index>=static_cast<int>(i))
 309                 ++list.sel_index;
 310
 311         Item *item = list.create_item(i);
 312         list.items.insert(list.items.begin()+i, item);
 313         list.items_changed();
 314 }
 315
 316 void List::DataObserver::item_removed(unsigned i)
 317 {
 318         bool had_selection = (list.sel_index>=0);
 319         if(list.sel_index>static_cast<int>(i))
 320                 --list.sel_index;
 321         else if(list.sel_index==static_cast<int>(i))
 322                 list.sel_index = -1;
 323
 324         delete list.items[i];
 325         list.items.erase(list.items.begin()+i);
 326         list.items_changed();
 327
 328         if(had_selection && list.sel_index<0)
 329                 list.signal_selection_cleared.emit();
 330 }
 331
 332 void List::DataObserver::cleared()
 333 {
 334         list.sel_index = -1;
 335         for(vector<Item *>::iterator i=list.items.begin(); i!=list.items.end(); ++i)
 336                 delete *i;
 337         list.items.clear();
 338         list.items_changed();
 339
 340         list.signal_selection_cleared.emit();
 341 }
 342
 343 void List::DataObserver::refresh_item(unsigned i)
 344 {
 345         delete list.items[i];
 346         // Avoid stale pointer while create_item is executing
 347         list.items[i] = 0;
 348         list.items[i] = list.create_item(i);
 349         list.items_changed();
 350 }
 351
 352
 353 void List::Item::autosize_special(const Part &part, Geometry &ageom) const
 354 {
 355         if(part.get_name()=="children")
 356         {
 357                 const Sides &margin = part.get_margin();
 358                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 359                 {
 360                         Geometry cgeom;
 361                         (*i)->widget->autosize(cgeom);
 362                         ageom.w = max(ageom.w, cgeom.x+cgeom.w+margin.right);
 363                         ageom.h = max(ageom.h, cgeom.y+cgeom.h+margin.top);
 364                 }
 365         }
 366 }
 367
 368 void List::Item::set_active(bool a)
 369 {
 370         set_state(ACTIVE, (a ? ACTIVE : NORMAL));
 371 }
 372
 373 void List::Item::render_special(const Part &part, GL::Renderer &renderer) const
 374 {
 375         if(part.get_name()=="children")
 376         {
 377                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 378                         (*i)->widget->render(renderer);
 379         }
 380 }
 381
 382
 383 void List::MultiColumnItem::check_widths(vector<unsigned> &widths) const
 384 {
 385         if(widths.size()<children.size())
 386                 widths.resize(children.size(), 0);
 387
 388         unsigned n = 0;
 389         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i, ++n)
 390         {
 391                 Geometry cgeom;
 392                 (*i)->widget->autosize(cgeom);
 393                 // TODO invent a better way to specify spacings
 394                 widths[n] = max(widths[n], cgeom.w+8);
 395         }
 396 }
 397
 398 void List::MultiColumnItem::set_widths(const vector<unsigned> &widths)
 399 {
 400         if(!style)
 401                 return;
 402
 403         const Part *part = style->get_part("children");
 404         if(!part)
 405                 return;
 406
 407         const Sides &margin = part->get_margin();
 408         int x = margin.left;
 409         unsigned n = 0;
 410         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i, ++n)
 411         {
 412                 (*i)->widget->set_position(x, margin.bottom);
 413                 x += widths[n];
 414         }
 415 }
 416
 417 void List::MultiColumnItem::on_style_change()
 418 {
 419         if(!style)
 420                 return;
 421
 422         for(std::list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 423                 (*i)->widget->autosize();
 424
 425         vector<unsigned> widths;
 426         List *list = static_cast<List *>(parent);
 427         for(vector<Item *>::const_iterator i=list->items.begin(); i!=list->items.end(); ++i)
 428                 if(*i!=this)
 429                         if(MultiColumnItem *mci = dynamic_cast<MultiColumnItem *>(*i))
 430                                 mci->check_widths(widths);
 431
 432         vector<unsigned> self_widths(widths);
 433         check_widths(self_widths);
 434         bool update_all = false;
 435         for(unsigned i=0; (!update_all && i<widths.size() && i<self_widths.size()); ++i)
 436                 update_all = self_widths[i]>widths[i];
 437
 438         if(update_all)
 439         {
 440                 for(vector<Item *>::const_iterator i=list->items.begin(); i!=list->items.end(); ++i)
 441                         if(MultiColumnItem *mci = dynamic_cast<MultiColumnItem *>(*i))
 442                                 mci->set_widths(self_widths);
 443         }
 444
 445         set_widths(self_widths);
 446 }
 447
 448
 449 List::BasicItem::BasicItem(const string &text):
 450         label(text)
 451 {
 452         add(label);
 453 }
 454
 455 void List::BasicItem::on_style_change()
 456 {
 457         if(!style)
 458                 return;
 459
 460         label.autosize();
 461         if(const Part *part = style->get_part("children"))
 462         {
 463                 const Sides &margin = part->get_margin();
 464                 label.set_position(margin.left, margin.bottom);
 465         }
 466 }
 467
 468
 469 List::Loader::Loader(List &l):
 470         DataFile::DerivedObjectLoader<List, Widget::Loader>(l)
 471 {
 472         add("item", &Loader::item);
 473         add("view_size", &List::view_size);
 474 }
 475
 476 void List::Loader::item(const string &v)
 477 {
 478         dynamic_cast<BasicListData<string> &>(*obj.data).append(v);
 479 }
 480
 481 } // namespace GLtk
 482 } // namespace Msp