source/container.cpp

   1 #include "container.h"
   2 #include "part.h"
   3
   4 using namespace std;
   5
   6 namespace Msp {
   7 namespace GLtk {
   8
   9 hierarchy_error::hierarchy_error(const string &w):
  10         logic_error(w)
  11 { }
  12
  13
  14 Container::Container():
  15         click_focus(0),
  16         click_button(0),
  17         pointer_focus(0),
  18         pointer_grabbed(false),
  19         input_focus(0),
  20         touch_focus(0)
  21 { }
  22
  23 Container::~Container()
  24 {
  25         while(!children.empty())
  26                 delete children.front()->widget;
  27 }
  28
  29 void Container::add(Widget &wdg)
  30 {
  31         wdg.set_parent(this);
  32         children.push_back(create_child(&wdg));
  33         on_child_added(wdg);
  34 }
  35
  36 void Container::remove(Widget &wdg)
  37 {
  38         for(list<Child *>::iterator i=children.begin(); i!=children.end(); ++i)
  39                 if((*i)->widget==&wdg)
  40                 {
  41                         wdg.set_parent(0);
  42                         delete *i;
  43                         children.erase(i);
  44                         on_child_removed(wdg);
  45                         return;
  46                 }
  47
  48         throw hierarchy_error("widget not in container");
  49 }
  50
  51 Container::Child *Container::create_child(Widget *wdg)
  52 {
  53         return new Child(*this, wdg);
  54 }
  55
  56 Geometry Container::determine_child_geometry(const Widget &child, const Part &part) const
  57 {
  58         Geometry pgeom = part.get_geometry();
  59         if(!pgeom.w || !pgeom.h)
  60         {
  61                 Geometry cgeom;
  62                 child.autosize(cgeom);
  63                 if(!pgeom.w)
  64                         pgeom.w = cgeom.w;
  65                 if(!pgeom.h)
  66                         pgeom.h = cgeom.h;
  67         }
  68
  69         part.get_alignment().apply(pgeom, geom, part.get_margin());
  70         return pgeom;
  71 }
  72
  73 void Container::autosize_child(const Widget &child, const Part &part, Geometry &ageom) const
  74 {
  75         Geometry cgeom = determine_child_geometry(child, part);
  76         const Sides &margin = part.get_margin();
  77         ageom.w = max(ageom.w, cgeom.w+margin.left+margin.right);
  78         ageom.h = max(ageom.h, cgeom.h+margin.top+margin.bottom);
  79 }
  80
  81 void Container::reposition_child(Widget &child, const Part &part) const
  82 {
  83         child.set_geometry(determine_child_geometry(child, part));
  84 }
  85
  86 list<Widget *> Container::get_children() const
  87 {
  88         list<Widget *> result;
  89         for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
  90                 result.push_back((*i)->widget);
  91         return result;
  92 }
  93
  94 Widget *Container::get_child_at(int x, int y) const
  95 {
  96         for(list<Child *>::const_iterator i=children.end(); i!=children.begin();)
  97                 if((*--i)->widget->is_visible() && (*i)->widget->get_geometry().is_inside(x, y))
  98                         return (*i)->widget;
  99
 100         return 0;
 101 }
 102
 103 Widget *Container::get_descendant_at(int x, int y) const
 104 {
 105         Widget *wdg = get_child_at(x, y);
 106         if(Container *cont = dynamic_cast<Container *>(wdg))
 107         {
 108                 const Geometry &cgeom = wdg->get_geometry();
 109                 Widget *wdg2 = cont->get_descendant_at(x-cgeom.x, y-cgeom.y);
 110                 if(wdg2)
 111                         return wdg2;
 112         }
 113         return wdg;
 114 }
 115
 116 void Container::raise(Widget &wdg)
 117 {
 118         for(list<Child *>::iterator i=children.begin(); i!=children.end(); ++i)
 119                 if((*i)->widget==&wdg)
 120                 {
 121                         children.splice(children.end(), children, i);
 122                         return;
 123                 }
 124
 125         throw hierarchy_error("widget not in container");
 126 }
 127
 128 void Container::set_pointer_focus(Widget *wdg)
 129 {
 130         if(wdg!=pointer_focus)
 131         {
 132                 if(pointer_focus)
 133                         pointer_focus->pointer_leave();
 134
 135                 pointer_focus = wdg;
 136
 137                 if(pointer_focus)
 138                         pointer_focus->pointer_enter();
 139         }
 140 }
 141
 142 void Container::set_input_focus(Widget *wdg)
 143 {
 144         if(wdg!=input_focus)
 145         {
 146                 if(input_focus)
 147                         input_focus->focus_out();
 148
 149                 input_focus = wdg;
 150
 151                 if(input_focus)
 152                 {
 153                         raise(*wdg);
 154                         input_focus->focus_in();
 155                 }
 156         }
 157 }
 158
 159 Widget *Container::get_final_input_focus() const
 160 {
 161         if(Container *container = dynamic_cast<Container *>(input_focus))
 162                 if(Widget *focus = container->get_final_input_focus())
 163                         return focus;
 164
 165         return input_focus;
 166 }
 167
 168 void Container::button_press(int x, int y, unsigned btn)
 169 {
 170         if(Widget *child = get_pointer_target(x, y, false))
 171         {
 172                 if(!click_focus)
 173                 {
 174                         set_pointer_focus(child);
 175                         if(child->is_focusable())
 176                                 set_input_focus(child);
 177
 178                         click_focus = child;
 179                         click_button = btn;
 180                 }
 181
 182                 const Geometry &cgeom = child->get_geometry();
 183                 child->button_press(x-cgeom.x, y-cgeom.y, btn);
 184         }
 185 }
 186
 187 void Container::button_release(int x, int y, unsigned btn)
 188 {
 189         if(Widget *child = get_pointer_target(x, y, false))
 190         {
 191                 if(child==click_focus && btn==click_button)
 192                 {
 193                         click_focus = 0;
 194                         if(!pointer_focus)
 195                                 set_pointer_focus(get_child_at(x, y));
 196                 }
 197
 198                 const Geometry &cgeom = child->get_geometry();
 199                 child->button_release(x-cgeom.x, y-cgeom.y, btn);
 200         }
 201 }
 202
 203 void Container::pointer_motion(int x, int y)
 204 {
 205         Widget *child = get_pointer_target(x, y, false);
 206         if(!pointer_grabbed)
 207                 set_pointer_focus((!click_focus || child->get_geometry().is_inside(x, y)) ? child : 0);
 208
 209         if(child)
 210         {
 211                 const Geometry &cgeom = child->get_geometry();
 212                 child->pointer_motion(x-cgeom.x, y-cgeom.y);
 213         }
 214 }
 215
 216 Widget *Container::get_pointer_target(int x, int y, bool touch) const
 217 {
 218         if(pointer_grabbed)
 219                 return pointer_focus;
 220         else if(!touch && click_focus)
 221                 return click_focus;
 222         else if(touch && touch_focus)
 223                 return touch_focus;
 224         else
 225         {
 226                 Widget *child = get_child_at(x, y);
 227                 if(child && child->is_enabled())
 228                         return child;
 229                 else
 230                         return 0;
 231         }
 232 }
 233
 234 void Container::pointer_leave()
 235 {
 236         Widget::pointer_leave();
 237         set_pointer_focus(0);
 238 }
 239
 240 void Container::touch_press(int x, int y, unsigned finger)
 241 {
 242         if(Widget *child = get_pointer_target(x, y, true))
 243         {
 244                 // TODO track focus for each finger separately
 245                 if(!touch_focus)
 246                         touch_focus = child;
 247
 248                 const Geometry &cgeom = child->get_geometry();
 249                 child->touch_press(x-cgeom.x, y-cgeom.y, finger);
 250         }
 251 }
 252
 253 void Container::touch_release(int x, int y, unsigned finger)
 254 {
 255         if(Widget *child = get_pointer_target(x, y, true))
 256         {
 257                 // TODO track focus for each finger separately
 258                 if(child==touch_focus)
 259                         touch_focus = 0;
 260
 261                 const Geometry &cgeom = child->get_geometry();
 262                 child->touch_release(x-cgeom.x, y-cgeom.y, finger);
 263         }
 264 }
 265
 266 void Container::touch_motion(int x, int y, unsigned finger)
 267 {
 268         if(Widget *child = get_pointer_target(x, y, true))
 269         {
 270                 const Geometry &cgeom = child->get_geometry();
 271                 child->touch_motion(x-cgeom.x, y-cgeom.y, finger);
 272         }
 273 }
 274
 275 bool Container::key_press(unsigned key, unsigned mod)
 276 {
 277         if(input_focus)
 278                 return input_focus->key_press(key, mod);
 279         else
 280                 return false;
 281 }
 282
 283 bool Container::key_release(unsigned key, unsigned mod)
 284 {
 285         if(input_focus)
 286                 return input_focus->key_release(key, mod);
 287         else
 288                 return false;
 289 }
 290
 291 bool Container::character(wchar_t ch)
 292 {
 293         if(input_focus)
 294                 return input_focus->character(ch);
 295         else
 296                 return false;
 297 }
 298
 299 void Container::focus_out()
 300 {
 301         set_input_focus(0);
 302         Widget::focus_out();
 303 }
 304
 305 bool Container::navigate(Navigation nav)
 306 {
 307         if(input_focus && input_focus->navigate(nav))
 308                 return true;
 309
 310         if(nav==NAV_UP || nav==NAV_DOWN || nav==NAV_LEFT || nav==NAV_RIGHT)
 311         {
 312                 int x = geom.w/2;
 313                 int y = geom.h/2;
 314                 if(input_focus)
 315                 {
 316                         const Geometry &fgeom = input_focus->get_geometry();
 317                         x = fgeom.x+fgeom.w/2;
 318                         y = fgeom.y+fgeom.h/2;
 319                 }
 320                 else if(nav==NAV_UP)
 321                         y = 0;
 322                 else if(nav==NAV_DOWN)
 323                         y = geom.h;
 324                 else if(nav==NAV_RIGHT)
 325                         x = 0;
 326                 else if(nav==NAV_LEFT)
 327                         x = geom.w;
 328
 329                 Widget *sibling = 0;
 330                 int best_score = 0;
 331                 for(list<Child *>::const_iterator i=children.begin(); i!=children.end(); ++i)
 332                 {
 333                         if((*i)->widget==input_focus || !(*i)->widget->is_focusable())
 334                                 continue;
 335
 336                         const Geometry &cgeom = (*i)->widget->get_geometry();
 337                         int dx = cgeom.x+cgeom.w/2-x;
 338                         int dy = cgeom.y+cgeom.h/2-y;
 339
 340                         int score = -1;
 341                         if(nav==NAV_UP && dy>0)
 342                                 score = dy+abs(dx)*4;
 343                         else if(nav==NAV_DOWN && dy<0)
 344                                 score = -dy+abs(dx)*4;
 345                         else if(nav==NAV_RIGHT && dx>0)
 346                                 score = dx+abs(dy)*4;
 347                         else if(nav==NAV_LEFT && dx<0)
 348                                 score = -dx+abs(dy)*4;
 349
 350                         if(score>0 && (!sibling || score<best_score))
 351                         {
 352                                 sibling = (*i)->widget;
 353                                 best_score = score;
 354                         }
 355                 }
 356
 357                 if(sibling)
 358                 {
 359                         set_input_focus(sibling);
 360                         if(Container *container = dynamic_cast<Container *>(sibling))
 361                                 container->navigate(nav);
 362                         return true;
 363                 }
 364         }
 365
 366         return false;
 367 }
 368
 369 void Container::on_reparent()
 370 {
 371         for(list<Child *>::iterator i=children.begin(); i!=children.end(); ++i)
 372         {
 373                 if(Container *c = dynamic_cast<Container *>((*i)->widget))
 374                         c->on_reparent();
 375                 (*i)->widget->update_style();
 376         }
 377 }
 378
 379
 380 Container::Child::Child(Container &c, Widget *w):
 381         container(c),
 382         widget(w)
 383 {
 384         widget->signal_visibility_changed.connect(sigc::mem_fun(this, &Child::visibility_changed));
 385         widget->signal_request_focus.connect(sigc::mem_fun(this, &Child::request_focus));
 386         widget->signal_grab_pointer.connect(sigc::mem_fun(this, &Child::grab_pointer));
 387         widget->signal_ungrab_pointer.connect(sigc::mem_fun(this, &Child::ungrab_pointer));
 388 }
 389
 390 Container::Child::~Child()
 391 {
 392         visibility_changed(false);
 393 }
 394
 395 void Container::Child::visibility_changed(bool v)
 396 {
 397         if(!v)
 398         {
 399                 if(widget==container.click_focus)
 400                         container.click_focus = 0;
 401                 if(widget==container.pointer_focus)
 402                         container.set_pointer_focus(0);
 403                 if(widget==container.input_focus)
 404                         container.set_input_focus(0);
 405         }
 406 }
 407
 408 void Container::Child::request_focus()
 409 {
 410         container.set_input_focus(widget);
 411         if(container.parent && container.visible)
 412                 container.set_focus();
 413 }
 414
 415 void Container::Child::grab_pointer()
 416 {
 417         if(!container.pointer_grabbed)
 418         {
 419                 container.set_pointer_focus(widget);
 420                 container.pointer_grabbed = true;
 421                 container.signal_grab_pointer.emit();
 422         }
 423 }
 424
 425 void Container::Child::ungrab_pointer()
 426 {
 427         if(container.pointer_grabbed && container.pointer_focus==widget)
 428         {
 429                 // XXX Should set to the widget under pointer
 430                 container.set_pointer_focus(0);
 431                 container.pointer_grabbed = false;
 432                 container.signal_ungrab_pointer.emit();
 433         }
 434 }
 435
 436 } // namespace GLtk
 437 } // namespace Msp