source/container.cpp

   1 #include <msp/core/algorithm.h>
   2 #include "container.h"
   3 #include "part.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GLtk {
   9
  10 hierarchy_error::hierarchy_error(const string &w):
  11         logic_error(w)
  12 { }
  13
  14
  15 Container::~Container()
  16 {
  17         // Clear children here while members are still valid
  18         while(!children.empty())
  19         {
  20                 if(children.back()->own_widget)
  21                         /* Avoid destroying the unique_ptr for the widget from within its own
  22                         reset() function */
  23                         unique_ptr<Widget> w = move(children.back()->own_widget);
  24                 else
  25                         children.pop_back();
  26         }
  27 }
  28
  29 void Container::add(unique_ptr<Widget> wdg)
  30 {
  31         add_child(*wdg).own_widget = move(wdg);
  32 }
  33
  34 void Container::remove(Widget &wdg)
  35 {
  36         auto i = find_if(children, [&wdg](const unique_ptr<Child> &c){ return c->widget==&wdg; });
  37         if(i==children.end())
  38                 throw hierarchy_error("widget not in container");
  39
  40         unique_ptr<Widget> owned = move((*i)->own_widget);
  41         if(&wdg==saved_input_focus)
  42                 saved_input_focus = nullptr;
  43         wdg.set_parent(nullptr);
  44         children.erase(i);
  45         if(wdg.get_animation_interval())
  46                 check_animation_interval();
  47         on_child_removed(wdg);
  48 }
  49
  50 Container::Child &Container::add_child(Widget &wdg)
  51 {
  52         wdg.set_parent(this);
  53         children.push_back(make_unique<Child>(*this, &wdg));
  54         if(wdg.get_animation_interval())
  55                 check_animation_interval();
  56         children_rebuild_needed = true;
  57         signal_rebuild_needed.emit();
  58         on_child_added(wdg);
  59         return *children.back();
  60 }
  61
  62 Geometry Container::determine_child_geometry(const Widget &child, const Part &part) const
  63 {
  64         Geometry pgeom = part.get_geometry();
  65         if(!pgeom.w || !pgeom.h)
  66         {
  67                 Geometry cgeom;
  68                 child.autosize(cgeom);
  69                 if(!pgeom.w)
  70                         pgeom.w = cgeom.w;
  71                 if(!pgeom.h)
  72                         pgeom.h = cgeom.h;
  73         }
  74
  75         part.get_alignment().apply(pgeom, geom, part.get_margin());
  76         return pgeom;
  77 }
  78
  79 void Container::autosize_child(const Widget &child, const Part &part, Geometry &ageom) const
  80 {
  81         Geometry cgeom = determine_child_geometry(child, part);
  82         const Sides &margin = part.get_margin();
  83         ageom.w = max(ageom.w, cgeom.w+margin.left+margin.right);
  84         ageom.h = max(ageom.h, cgeom.h+margin.top+margin.bottom);
  85 }
  86
  87 void Container::reposition_child(Widget &child, const Part &part) const
  88 {
  89         child.set_geometry(determine_child_geometry(child, part));
  90 }
  91
  92 vector<Widget *> Container::get_children() const
  93 {
  94         vector<Widget *> result;
  95         for(const unique_ptr<Child> &c: children)
  96                 result.push_back(c->widget);
  97         return result;
  98 }
  99
 100 Widget *Container::find_child_at(int x, int y) const
 101 {
 102         for(auto i=children.end(); i!=children.begin();)
 103                 if((*--i)->widget->is_visible() && (*i)->widget->get_geometry().is_inside(x, y))
 104                         return (*i)->widget;
 105
 106         return nullptr;
 107 }
 108
 109 Widget *Container::find_descendant_at(int x, int y) const
 110 {
 111         Widget *wdg = find_child_at(x, y);
 112         if(Container *cont = dynamic_cast<Container *>(wdg))
 113         {
 114                 const Geometry &cgeom = wdg->get_geometry();
 115                 if(Widget *wdg2 = cont->find_descendant_at(x-cgeom.x, y-cgeom.y))
 116                         return wdg2;
 117         }
 118         return wdg;
 119 }
 120
 121 void Container::raise(Widget &wdg)
 122 {
 123         auto i = find_if(children, [&wdg](const unique_ptr<Child> &c){ return c->widget==&wdg; });
 124         if(i==children.end())
 125                 throw hierarchy_error("widget not in container");
 126
 127         unique_ptr<Child> c = move(*i);
 128         children.erase(i);
 129         children.push_back(move(c));
 130 }
 131
 132 void Container::set_pointer_focus(Widget *wdg, bool grab)
 133 {
 134         if(wdg!=pointer_focus)
 135         {
 136                 if(pointer_focus)
 137                         pointer_focus->pointer_leave();
 138
 139                 pointer_focus = wdg;
 140                 pointer_grabbed = grab;
 141
 142                 if(pointer_focus)
 143                         pointer_focus->pointer_enter();
 144         }
 145         else
 146                 pointer_grabbed = grab;
 147 }
 148
 149 void Container::set_input_focus(Widget *wdg)
 150 {
 151         if(wdg!=input_focus)
 152         {
 153                 if(input_focus)
 154                         input_focus->focus_out();
 155
 156                 input_focus = wdg;
 157                 on_input_focus_changed(input_focus);
 158
 159                 if(input_focus)
 160                         input_focus->focus_in();
 161         }
 162 }
 163
 164 Widget *Container::get_final_input_focus() const
 165 {
 166         if(Container *container = dynamic_cast<Container *>(input_focus))
 167                 if(Widget *focus = container->get_final_input_focus())
 168                         return focus;
 169
 170         return input_focus;
 171 }
 172
 173 void Container::check_animation_interval()
 174 {
 175         Time::TimeDelta shortest;
 176         for(const unique_ptr<Child> &c: children)
 177         {
 178                 const Time::TimeDelta &child_iv = c->widget->get_animation_interval();
 179                 if(child_iv && (!shortest || child_iv<shortest))
 180                         shortest = child_iv;
 181         }
 182
 183         if(shortest!=anim_interval)
 184                 set_animation_interval(shortest);
 185 }
 186
 187 void Container::rebuild_hierarchy()
 188 {
 189         Widget::rebuild_hierarchy();
 190
 191         if(children_rebuild_needed)
 192         {
 193                 children_rebuild_needed = false;
 194                 for(const unique_ptr<Child> &c: children)
 195                         c->widget->rebuild_hierarchy();
 196         }
 197 }
 198
 199 void Container::button_press(int x, int y, unsigned btn)
 200 {
 201         if(Widget *child = get_pointer_target(x, y, false))
 202         {
 203                 if(!click_focus)
 204                 {
 205                         set_pointer_focus(child);
 206                         if(child->is_focusable())
 207                                 set_input_focus(child);
 208
 209                         click_focus = child;
 210                         click_button = btn;
 211                 }
 212
 213                 const Geometry &cgeom = child->get_geometry();
 214                 child->button_press(x-cgeom.x, y-cgeom.y, btn);
 215         }
 216 }
 217
 218 void Container::button_release(int x, int y, unsigned btn)
 219 {
 220         if(Widget *child = get_pointer_target(x, y, false))
 221         {
 222                 if(child==click_focus && btn==click_button)
 223                 {
 224                         click_focus = nullptr;
 225                         if(!pointer_focus)
 226                                 set_pointer_focus(find_child_at(x, y));
 227                 }
 228
 229                 const Geometry &cgeom = child->get_geometry();
 230                 child->button_release(x-cgeom.x, y-cgeom.y, btn);
 231         }
 232 }
 233
 234 void Container::pointer_motion(int x, int y)
 235 {
 236         Widget *child = get_pointer_target(x, y, false);
 237         if(!pointer_grabbed)
 238                 set_pointer_focus((child && child->get_geometry().is_inside(x, y)) ? child : nullptr);
 239
 240         if(child)
 241         {
 242                 const Geometry &cgeom = child->get_geometry();
 243                 child->pointer_motion(x-cgeom.x, y-cgeom.y);
 244         }
 245 }
 246
 247 Widget *Container::get_pointer_target(int x, int y, bool touch) const
 248 {
 249         if(pointer_grabbed)
 250                 return pointer_focus;
 251         else if(!touch && click_focus)
 252                 return click_focus;
 253         else if(touch && touch_focus)
 254                 return touch_focus;
 255         else
 256         {
 257                 Widget *child = find_child_at(x, y);
 258                 if(child && child->is_enabled())
 259                         return child;
 260                 else
 261                         return nullptr;
 262         }
 263 }
 264
 265 void Container::pointer_leave()
 266 {
 267         Widget::pointer_leave();
 268         set_pointer_focus(nullptr);
 269 }
 270
 271 void Container::touch_press(int x, int y, unsigned finger)
 272 {
 273         if(Widget *child = get_pointer_target(x, y, true))
 274         {
 275                 // TODO track focus for each finger separately
 276                 if(!touch_focus)
 277                         touch_focus = child;
 278
 279                 const Geometry &cgeom = child->get_geometry();
 280                 child->touch_press(x-cgeom.x, y-cgeom.y, finger);
 281         }
 282 }
 283
 284 void Container::touch_release(int x, int y, unsigned finger)
 285 {
 286         if(Widget *child = get_pointer_target(x, y, true))
 287         {
 288                 // TODO track focus for each finger separately
 289                 if(child==touch_focus)
 290                         touch_focus = nullptr;
 291
 292                 const Geometry &cgeom = child->get_geometry();
 293                 child->touch_release(x-cgeom.x, y-cgeom.y, finger);
 294         }
 295 }
 296
 297 void Container::touch_motion(int x, int y, unsigned finger)
 298 {
 299         if(Widget *child = get_pointer_target(x, y, true))
 300         {
 301                 const Geometry &cgeom = child->get_geometry();
 302                 child->touch_motion(x-cgeom.x, y-cgeom.y, finger);
 303         }
 304 }
 305
 306 bool Container::key_press(unsigned key, unsigned mod)
 307 {
 308         if(input_focus && input_focus->is_enabled())
 309                 return input_focus->key_press(key, mod);
 310         else
 311                 return false;
 312 }
 313
 314 bool Container::key_release(unsigned key, unsigned mod)
 315 {
 316         if(input_focus && input_focus->is_enabled())
 317                 return input_focus->key_release(key, mod);
 318         else
 319                 return false;
 320 }
 321
 322 bool Container::character(wchar_t ch)
 323 {
 324         if(input_focus && input_focus->is_enabled())
 325                 return input_focus->character(ch);
 326         else
 327                 return false;
 328 }
 329
 330 void Container::focus_in()
 331 {
 332         if(saved_input_focus)
 333                 set_input_focus(saved_input_focus);
 334         Widget::focus_in();
 335 }
 336
 337 void Container::focus_out()
 338 {
 339         saved_input_focus = input_focus;
 340         set_input_focus(nullptr);
 341         Widget::focus_out();
 342 }
 343
 344 bool Container::navigate(Navigation nav)
 345 {
 346         if(input_focus && input_focus->is_enabled())
 347                 return input_focus->navigate(nav);
 348         else
 349                 return false;
 350 }
 351
 352 void Container::animate(const Time::TimeDelta &dt)
 353 {
 354         for(const unique_ptr<Child> &c: children)
 355         {
 356                 const Time::TimeDelta &child_iv = c->widget->get_animation_interval();
 357                 if(!child_iv)
 358                         continue;
 359
 360                 c->time_since_animate += dt;
 361                 if(c->time_since_animate>=child_iv)
 362                 {
 363                         Time::TimeDelta child_dt = c->time_since_animate;
 364                         c->time_since_animate = min(c->time_since_animate-child_iv, child_iv);
 365                         c->widget->animate(child_dt);
 366                 }
 367         }
 368 }
 369
 370 void Container::on_reparent()
 371 {
 372         for(const unique_ptr<Child> &c: children)
 373         {
 374                 if(Container *o = dynamic_cast<Container *>(c->widget))
 375                         o->on_reparent();
 376                 c->widget->update_style();
 377         }
 378 }
 379
 380 void Container::on_input_focus_changed(Widget *wdg)
 381 {
 382         if(wdg)
 383                 raise(*wdg);
 384 }
 385
 386
 387 Container::Child::Child(Container &c, Widget *w):
 388         container(c),
 389         widget(w)
 390 {
 391         widget->signal_visibility_changed.connect(sigc::mem_fun(this, &Child::visibility_changed));
 392         widget->signal_request_focus.connect(sigc::mem_fun(this, &Child::request_focus));
 393         widget->signal_grab_pointer.connect(sigc::mem_fun(this, &Child::grab_pointer));
 394         widget->signal_ungrab_pointer.connect(sigc::mem_fun(this, &Child::ungrab_pointer));
 395         widget->signal_request_animation.connect(sigc::mem_fun(this, &Child::request_animation));
 396         widget->signal_rebuild_needed.connect(sigc::mem_fun(this, &Child::rebuild_needed));
 397 }
 398
 399 Container::Child::Child(Container &c, unique_ptr<Widget> w):
 400         Child(c, w.get())
 401 {
 402         own_widget = move(w);
 403 }
 404
 405 Container::Child::~Child()
 406 {
 407         visibility_changed(false);
 408 }
 409
 410 void Container::Child::visibility_changed(bool v)
 411 {
 412         if(!v)
 413         {
 414                 if(widget==container.click_focus)
 415                         container.click_focus = nullptr;
 416                 if(widget==container.pointer_focus)
 417                         container.set_pointer_focus(nullptr);
 418                 if(widget==container.input_focus)
 419                         container.set_input_focus(nullptr);
 420         }
 421 }
 422
 423 void Container::Child::request_focus()
 424 {
 425         if(container.parent && container.visible)
 426                 container.set_focus();
 427         if(container.state&FOCUS)
 428                 container.set_input_focus(widget);
 429 }
 430
 431 void Container::Child::grab_pointer()
 432 {
 433         if(!container.pointer_grabbed)
 434         {
 435                 container.set_pointer_focus(widget, true);
 436                 container.signal_grab_pointer.emit();
 437         }
 438 }
 439
 440 void Container::Child::ungrab_pointer()
 441 {
 442         if(container.pointer_grabbed && container.pointer_focus==widget)
 443         {
 444                 // XXX Should set to the widget under pointer
 445                 container.set_pointer_focus(nullptr);
 446                 container.signal_ungrab_pointer.emit();
 447         }
 448 }
 449
 450 void Container::Child::request_animation(const Time::TimeDelta &interval)
 451 {
 452         if(!interval)
 453                 time_since_animate = Time::zero;
 454         container.check_animation_interval();
 455 }
 456
 457 void Container::Child::rebuild_needed()
 458 {
 459         container.children_rebuild_needed = true;
 460         container.signal_rebuild_needed.emit();
 461 }
 462
 463 } // namespace GLtk
 464 } // namespace Msp