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         add(*item);
 127         item->autosize();
 128         item->signal_autosize_changed.connect(sigc::bind(sigc::mem_fun(this, &List::item_autosize_changed), item));
 129         return item;
 130 }
 131
 132 void List::set_view_size(unsigned s)
 133 {
 134         view_size = s;
 135         signal_autosize_changed.emit();
 136 }
 137
 138 void List::set_view_all()
 139 {
 140         set_view_size(0);
 141 }
 142
 143 void List::set_selected_index(int i)
 144 {
 145         if(i>=static_cast<int>(data->size()))
 146                 throw out_of_range("List::set_selected_index");
 147
 148         if(i==sel_index)
 149                 return;
 150
 151         if(sel_index>=0)
 152                 items[sel_index]->set_active(false);
 153         if(i<0)
 154                 sel_index = -1;
 155         else
 156         {
 157                 sel_index = i;
 158                 items[sel_index]->set_active(true);
 159                 signal_item_selected.emit(sel_index);
 160         }
 161 }
 162
 163 void List::rebuild_special(const Part &part)
 164 {
 165         if(part.get_name()=="slider")
 166                 reposition_child(slider, part);
 167         else if(part.get_name()=="items")
 168         {
 169                 SetFlag flag(ignore_slider_change);
 170                 check_view_range();
 171
 172                 const Sides &margin = part.get_margin();
 173                 unsigned w = geom.w-min(geom.w, margin.left+margin.right);
 174                 unsigned y = geom.h-min(geom.h, margin.top);
 175                 for(unsigned i=0; i<items.size(); ++i)
 176                 {
 177                         if(i<first || !y)
 178                                 items[i]->set_visible(false);
 179                         else
 180                         {
 181                                 Geometry igeom = items[i]->get_geometry();
 182                                 if(igeom.h+margin.bottom<=y)
 183                                 {
 184                                         items[i]->set_visible(true);
 185                                         y -= igeom.h;
 186                                         igeom.x = margin.left;
 187                                         igeom.y = y;
 188                                         igeom.w = w;
 189                                         items[i]->set_geometry(igeom);
 190                                 }
 191                                 else
 192                                 {
 193                                         items[i]->set_visible(false);
 194                                         y = 0;
 195                                 }
 196                         }
 197                 }
 198         }
 199
 200         Widget::rebuild_special(part);
 201 }
 202
 203 void List::render_special(const Part &part, GL::Renderer &renderer) const
 204 {
 205         if(part.get_name()=="items")
 206         {
 207                 for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
 208                         items[i]->render(renderer);
 209         }
 210         else if(part.get_name()=="slider")
 211                 slider.render(renderer);
 212 }
 213
 214 void List::button_press(int x, int y, unsigned btn)
 215 {
 216         Container::button_press(x, y, btn);
 217         if(click_focus && btn==1)
 218         {
 219                 for(unsigned i=first; (i<items.size() && items[i]->is_visible()); ++i)
 220                         if(click_focus==items[i])
 221                         {
 222                                 set_selected_index(i);
 223                                 break;
 224                         }
 225         }
 226 }
 227
 228 void List::item_autosize_changed(Item *item)
 229 {
 230         item->autosize();
 231         signal_autosize_changed.emit();
 232         rebuild();
 233 }
 234
 235 void List::check_view_range()
 236 {
 237         if(!style)
 238                 return;
 239
 240         unsigned h = geom.h;
 241         if(const Part *items_part = style->get_part("items"))
 242         {
 243                 const Sides &margin = items_part->get_margin();
 244                 h -= margin.top+margin.bottom;
 245         }
 246
 247         max_scroll = items.size();
 248         for(unsigned i=items.size(); i-->0; )
 249         {
 250                 unsigned ih = items[i]->get_geometry().h;
 251                 if(ih<=h)
 252                 {
 253                         h -= ih;
 254                         --max_scroll;
 255                 }
 256         }
 257
 258         if(first>max_scroll)
 259                 first = max_scroll;
 260
 261         slider.set_range(0, max_scroll);
 262         slider.set_value(max_scroll-first);
 263 }
 264
 265 void List::slider_value_changed(double value)
 266 {
 267         if(max_scroll>0 && !ignore_slider_change)
 268         {
 269                 first = max_scroll-static_cast<unsigned>(value);
 270                 rebuild();
 271         }
 272 }
 273
 274
 275 List::DataObserver::DataObserver(List &l):
 276         list(l)
 277 {
 278         list.data->signal_item_added.connect(sigc::mem_fun(this, &DataObserver::item_added));
 279         list.data->signal_item_removed.connect(sigc::mem_fun(this, &DataObserver::item_removed));
 280         list.data->signal_cleared.connect(sigc::mem_fun(this, &DataObserver::cleared));
 281         list.data->signal_refresh_item.connect(sigc::mem_fun(this, &DataObserver::refresh_item));
 282 }
 283
 284 void List::DataObserver::item_added(unsigned i)
 285 {
 286         if(list.sel_index>=static_cast<int>(i))
 287                 ++list.sel_index;
 288
 289         Item *item = list.create_item(i);
 290         list.items.insert(list.items.begin()+i, item);
 291         list.items_changed();
 292 }
 293
 294 void List::DataObserver::item_removed(unsigned i)
 295 {
 296         if(list.sel_index>static_cast<int>(i))
 297                 --list.sel_index;
 298         else if(list.sel_index==static_cast<int>(i))
 299                 list.sel_index = -1;
 300
 301         delete list.items[i];
 302         list.items.erase(list.items.begin()+i);
 303         list.items_changed();
 304 }
 305
 306 void List::DataObserver::cleared()
 307 {
 308         list.sel_index = -1;
 309         for(vector<Item *>::iterator i=list.items.begin(); i!=list.items.end(); ++i)
 310                 delete *i;
 311         list.items.clear();
 312         list.items_changed();
 313 }
 314
 315 void List::DataObserver::refresh_item(unsigned i)
 316 {
 317         delete list.items[i];
 318         // Avoid stale pointer while create_item is executing
 319         list.items[i] = 0;
 320         list.items[i] = list.create_item(i);
 321         list.items_changed();
 322 }
 323
 324
 325 void List::Item::autosize_special(const Part &part, Geometry &ageom) const
 326 {
 327         if(part.get_name()=="children")
 328         {
 329                 const Sides &margin = part.get_margin();
 330                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 331                 {
 332                         Geometry cgeom;
 333                         (*i)->widget->autosize(cgeom);
 334                         ageom.w = max(ageom.w, cgeom.x+cgeom.w+margin.right);
 335                         ageom.h = max(ageom.h, cgeom.y+cgeom.h+margin.top);
 336                 }
 337         }
 338 }
 339
 340 void List::Item::set_active(bool a)
 341 {
 342         set_state(ACTIVE, (a ? ACTIVE : NORMAL));
 343 }
 344
 345 void List::Item::render_special(const Part &part, GL::Renderer &renderer) const
 346 {
 347         if(part.get_name()=="children")
 348         {
 349                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 350                         (*i)->widget->render(renderer);
 351         }
 352 }
 353
 354
 355 void List::MultiColumnItem::check_widths(vector<unsigned> &widths) const
 356 {
 357         if(widths.size()<children.size())
 358                 widths.resize(children.size(), 0);
 359
 360         unsigned n = 0;
 361         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i, ++n)
 362         {
 363                 Geometry cgeom;
 364                 (*i)->widget->autosize(cgeom);
 365                 // TODO invent a better way to specify spacings
 366                 widths[n] = max(widths[n], cgeom.w+8);
 367         }
 368 }
 369
 370 void List::MultiColumnItem::set_widths(const vector<unsigned> &widths)
 371 {
 372         if(!style)
 373                 return;
 374
 375         const Part *part = style->get_part("children");
 376         if(!part)
 377                 return;
 378
 379         const Sides &margin = part->get_margin();
 380         int x = margin.left;
 381         unsigned n = 0;
 382         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i, ++n)
 383         {
 384                 (*i)->widget->set_position(x, margin.bottom);
 385                 x += widths[n];
 386         }
 387 }
 388
 389 void List::MultiColumnItem::on_style_change()
 390 {
 391         if(!style)
 392                 return;
 393
 394         for(std::list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 395                 (*i)->widget->autosize();
 396
 397         vector<unsigned> widths;
 398         List *list = static_cast<List *>(parent);
 399         for(vector<Item *>::const_iterator i=list->items.begin(); i!=list->items.end(); ++i)
 400                 if(*i!=this)
 401                         if(MultiColumnItem *mci = dynamic_cast<MultiColumnItem *>(*i))
 402                                 mci->check_widths(widths);
 403
 404         vector<unsigned> self_widths(widths);
 405         check_widths(self_widths);
 406         bool update_all = false;
 407         for(unsigned i=0; (!update_all && i<widths.size() && i<self_widths.size()); ++i)
 408                 update_all = self_widths[i]>widths[i];
 409
 410         if(update_all)
 411         {
 412                 for(vector<Item *>::const_iterator i=list->items.begin(); i!=list->items.end(); ++i)
 413                         if(MultiColumnItem *mci = dynamic_cast<MultiColumnItem *>(*i))
 414                                 mci->set_widths(self_widths);
 415         }
 416
 417         set_widths(self_widths);
 418 }
 419
 420
 421 List::BasicItem::BasicItem(const string &text):
 422         label(text)
 423 {
 424         add(label);
 425 }
 426
 427 void List::BasicItem::on_style_change()
 428 {
 429         if(!style)
 430                 return;
 431
 432         label.autosize();
 433         if(const Part *part = style->get_part("children"))
 434         {
 435                 const Sides &margin = part->get_margin();
 436                 label.set_position(margin.left, margin.bottom);
 437         }
 438 }
 439
 440
 441 List::Loader::Loader(List &l):
 442         DataFile::DerivedObjectLoader<List, Widget::Loader>(l)
 443 {
 444         add("item", &Loader::item);
 445         add("view_size", &List::view_size);
 446 }
 447
 448 void List::Loader::item(const string &v)
 449 {
 450         dynamic_cast<BasicListData<string> &>(*obj.data).append(v);
 451 }
 452
 453 } // namespace GLtk
 454 } // namespace Msp