Dogcows Code - chaz/openbox/blob - otk/widget.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #include "config.h"
   4 #include "widget.hh"
   5 #include "display.hh"
   6 #include "surface.hh"
   7 #include "rendertexture.hh"
   8 #include "rendercolor.hh"
   9 #include "eventdispatcher.hh"
  10 #include "screeninfo.hh"
  11
  12 #include <climits>
  13 #include <cassert>
  14 #include <algorithm>
  15
  16 namespace otk {
  17
  18 Widget::Widget(int screen, EventDispatcher *ed, Direction direction, int bevel,
  19                bool overrideredir)
  20   : _texture(0),
  21     _screen(screen),
  22     _parent(0),
  23     _window(0),
  24     _surface(0),
  25     _event_mask(ButtonPressMask | ButtonReleaseMask | ButtonMotionMask |
  26                 ExposureMask | StructureNotifyMask),
  27     _alignment(RenderStyle::CenterJustify),
  28     _direction(direction),
  29     _max_size(UINT_MAX, UINT_MAX),
  30     _visible(false),
  31     _bordercolor(0),
  32     _borderwidth(0),
  33     _bevel(bevel),
  34     _dirty(true),
  35     _dispatcher(ed),
  36     _ignore_config(0)
  37 {
  38   createWindow(overrideredir);
  39   _dispatcher->registerHandler(_window, this);
  40 }
  41
  42 Widget::Widget(Widget *parent, Direction direction, int bevel)
  43   : _texture(0),
  44     _screen(parent->_screen),
  45     _parent(parent),
  46     _window(0),
  47     _surface(0),
  48     _event_mask(ButtonPressMask | ButtonReleaseMask | ButtonMotionMask |
  49                 ExposureMask | StructureNotifyMask),
  50     _alignment(RenderStyle::CenterJustify),
  51     _direction(direction),
  52     _max_size(UINT_MAX, UINT_MAX),
  53     _visible(false),
  54     _bordercolor(0),
  55     _borderwidth(0),
  56     _bevel(bevel),
  57     _dirty(true),
  58     _dispatcher(parent->_dispatcher),
  59     _ignore_config(0)
  60 {
  61   assert(parent);
  62   createWindow(false);
  63   parent->addChild(this);
  64   if (parent->visible()) parent->layout();
  65   _dispatcher->registerHandler(_window, this);
  66 }
  67
  68 Widget::~Widget()
  69 {
  70   assert(_children.empty()); // this would be bad. theyd have a hanging _parent
  71
  72   if (_surface) delete _surface;
  73   if (_parent) _parent->removeChild(this);
  74
  75   _dispatcher->clearHandler(_window);
  76   XDestroyWindow(**display, _window);
  77 }
  78
  79 void Widget::show(bool children)
  80 {
  81   if (children) {
  82     std::list<Widget*>::iterator it , end = _children.end();
  83     for (it = _children.begin(); it != end; ++it) {
  84       (*it)->show(true);
  85     }
  86   }
  87   if (!_visible) {
  88     _visible = true;
  89     XMapWindow(**display, _window);
  90     update();
  91   }
  92 }
  93
  94 void Widget::hide()
  95 {
  96   if (_visible) {
  97     _visible = false;
  98     XUnmapWindow(**display, _window);
  99     if (_parent) _parent->layout();
 100   }
 101 }
 102
 103 void Widget::setEventMask(long e)
 104 {
 105   XSelectInput(**display, _window, e);
 106   _event_mask = e;
 107 }
 108
 109 void Widget::update()
 110 {
 111   if (!_visible) return;
 112   _dirty = true;
 113   if (parent())
 114     parent()->layout(); // relay-out us and our siblings
 115   else {
 116     render();
 117     layout();
 118   }
 119 }
 120
 121 void Widget::moveresize(const Rect &r)
 122 {
 123   unsigned int w, h;
 124   w = std::min(std::max(r.width(), minSize().width()), maxSize().width());
 125   h = std::min(std::max(r.height(), minSize().height()), maxSize().height());
 126
 127   if (r.x() == area().x() && r.y() == area().y() &&
 128       w == area().width() && h == area().height()) {
 129     return; // no change, don't cause a big layout chain to occur!
 130   }
 131
 132   internal_moveresize(r.x(), r.y(), w, h);
 133
 134   update();
 135 }
 136
 137 void Widget::internal_moveresize(int x, int y, unsigned w, unsigned int h)
 138 {
 139   assert(w > 0);
 140   assert(h > 0);
 141   assert(_borderwidth >= 0);
 142   _dirty = true;
 143   XMoveResizeWindow(**display, _window, x, y,
 144                     w - _borderwidth * 2,
 145                     h - _borderwidth * 2);
 146   _ignore_config++;
 147
 148   _area = Rect(x, y, w, h);
 149 }
 150
 151 void Widget::setAlignment(RenderStyle::Justify a)
 152 {
 153   _alignment = a;
 154   layout();
 155 }
 156
 157 void Widget::createWindow(bool overrideredir)
 158 {
 159   const ScreenInfo *info = display->screenInfo(_screen);
 160   XSetWindowAttributes attrib;
 161   unsigned long mask = CWEventMask | CWBorderPixel;
 162
 163   attrib.event_mask = _event_mask;
 164   attrib.border_pixel = (_bordercolor ?
 165                          _bordercolor->pixel():
 166                          BlackPixel(**display, _screen));
 167
 168   if (overrideredir) {
 169     mask |= CWOverrideRedirect;
 170     attrib.override_redirect = true;
 171   }
 172
 173   _window = XCreateWindow(**display, (_parent ?
 174                                       _parent->_window :
 175                                       RootWindow(**display, _screen)),
 176                           _area.x(), _area.y(),
 177                           _area.width(), _area.height(),
 178                           _borderwidth,
 179                           info->depth(),
 180                           InputOutput,
 181                           info->visual(),
 182                           mask,
 183                           &attrib);
 184   assert(_window != None);
 185   ++_ignore_config;
 186 }
 187
 188 void Widget::setBorderWidth(int w)
 189 {
 190   assert(w >= 0);
 191   if (!parent()) return; // top-level windows cannot have borders
 192   if (w == borderWidth()) return; // no change
 193
 194   _borderwidth = w;
 195   XSetWindowBorderWidth(**display, _window, _borderwidth);
 196
 197   calcDefaultSizes();
 198   update();
 199 }
 200
 201 void Widget::setMinSize(const Size &s)
 202 {
 203   _min_size = s;
 204   update();
 205 }
 206
 207 void Widget::setMaxSize(const Size &s)
 208 {
 209   _max_size = s;
 210   update();
 211 }
 212
 213 void Widget::setBorderColor(const RenderColor *c)
 214 {
 215   _bordercolor = c;
 216   XSetWindowBorder(**otk::display, _window,
 217                    c ? c->pixel() : BlackPixel(**otk::display, _screen));
 218 }
 219
 220 void Widget::setBevel(int b)
 221 {
 222   _bevel = b;
 223   calcDefaultSizes();
 224   layout();
 225 }
 226
 227 void Widget::layout()
 228 {
 229   if (_children.empty() || !_visible) return;
 230   if (_direction == Horizontal)
 231     layoutHorz();
 232   else
 233     layoutVert();
 234 }
 235
 236 void Widget::layoutHorz()
 237 {
 238   std::list<Widget*>::iterator it, end;
 239
 240   // work with just the visible children
 241   std::list<Widget*> visible = _children;
 242   for (it = visible.begin(), end = visible.end(); it != end;) {
 243     std::list<Widget*>::iterator next = it; ++next;
 244     if (!(*it)->visible())
 245       visible.erase(it);
 246     it = next;
 247   }
 248
 249   if (visible.empty()) return;
 250
 251   if ((unsigned)(_borderwidth * 2 + _bevel * 2) > _area.width() ||
 252       (unsigned)(_borderwidth * 2 + _bevel * 2) > _area.height())
 253     return; // not worth laying anything out!
 254
 255   int x, y; unsigned int w, h; // working area
 256   x = y = _bevel;
 257   w = _area.width() - _borderwidth * 2 - _bevel * 2;
 258   h = _area.height() - _borderwidth * 2 - _bevel * 2;
 259
 260   int free = w - (visible.size() - 1) * _bevel;
 261   if (free < 0) free = 0;
 262   unsigned int each;
 263
 264   std::list<Widget*> adjustable = visible;
 265
 266   // find the 'free' space, and how many children will be using it
 267   for (it = adjustable.begin(), end = adjustable.end(); it != end;) {
 268     std::list<Widget*>::iterator next = it; ++next;
 269     free -= (*it)->minSize().width();
 270     if (free < 0) free = 0;
 271     if ((*it)->maxSize().width() - (*it)->minSize().width() <= 0)
 272       adjustable.erase(it);
 273     it = next;
 274   }
 275   // some widgets may have max widths that restrict them, find the 'true'
 276   // amount of free space after these widgets are not included
 277   if (!adjustable.empty()) {
 278     do {
 279       each = free / adjustable.size();
 280       for (it = adjustable.begin(), end = adjustable.end(); it != end;) {
 281         std::list<Widget*>::iterator next = it; ++next;
 282         unsigned int m = (*it)->maxSize().width() - (*it)->minSize().width();
 283         if (m > 0 && m < each) {
 284           free -= m;
 285           if (free < 0) free = 0;
 286           adjustable.erase(it);
 287           break; // if one is found to be fixed, then the free space needs to
 288                  // change, and the rest need to be reexamined
 289         }
 290         it = next;
 291       }
 292     } while (it != end && !adjustable.empty());
 293   }
 294
 295   // place/size the widgets
 296   if (!adjustable.empty())
 297     each = free / adjustable.size();
 298   else
 299     each = 0;
 300   for (it = visible.begin(), end = visible.end(); it != end; ++it) {
 301     unsigned int w;
 302     // is the widget adjustable?
 303     std::list<Widget*>::const_iterator
 304       found = std::find(adjustable.begin(), adjustable.end(), *it);
 305     if (found != adjustable.end()) {
 306       // adjustable
 307       w = (*it)->minSize().width() + each;
 308     } else {
 309       // fixed
 310       w = (*it)->minSize().width();
 311     }
 312     // align it vertically
 313     int yy = y;
 314     unsigned int hh = std::max(std::min(h, (*it)->_max_size.height()),
 315                                (*it)->_min_size.height());
 316     if (hh < h) {
 317       switch(_alignment) {
 318       case RenderStyle::RightBottomJustify:
 319         yy += h - hh;
 320         break;
 321       case RenderStyle::CenterJustify:
 322         yy += (h - hh) / 2;
 323         break;
 324       case RenderStyle::LeftTopJustify:
 325         break;
 326       }
 327     }
 328     (*it)->internal_moveresize(x, yy, w, hh);
 329     (*it)->render();
 330     (*it)->layout();
 331     x += w + _bevel;
 332   }
 333 }
 334
 335 void Widget::layoutVert()
 336 {
 337   std::list<Widget*>::iterator it, end;
 338
 339   // work with just the visible children
 340   std::list<Widget*> visible = _children;
 341   for (it = visible.begin(), end = visible.end(); it != end;) {
 342     std::list<Widget*>::iterator next = it; ++next;
 343     if (!(*it)->visible())
 344       visible.erase(it);
 345     it = next;
 346   }
 347
 348   if (visible.empty()) return;
 349
 350   if ((unsigned)(_borderwidth * 2 + _bevel * 2) > _area.width() ||
 351       (unsigned)(_borderwidth * 2 + _bevel * 2) > _area.height())
 352     return; // not worth laying anything out!
 353
 354   int x, y; unsigned int w, h; // working area
 355   x = y = _bevel;
 356   w = _area.width() - _borderwidth * 2 - _bevel * 2;
 357   h = _area.height() - _borderwidth * 2 - _bevel * 2;
 358
 359   int free = h - (visible.size() - 1) * _bevel;
 360   if (free < 0) free = 0;
 361   unsigned int each;
 362
 363   std::list<Widget*> adjustable = visible;
 364
 365   // find the 'free' space, and how many children will be using it
 366   for (it = adjustable.begin(), end = adjustable.end(); it != end;) {
 367     std::list<Widget*>::iterator next = it; ++next;
 368     free -= (*it)->minSize().height();
 369     if (free < 0) free = 0;
 370     if ((*it)->maxSize().height() - (*it)->minSize().height() <= 0)
 371       adjustable.erase(it);
 372     it = next;
 373   }
 374   // some widgets may have max heights that restrict them, find the 'true'
 375   // amount of free space after these widgets are not included
 376   if (!adjustable.empty()) {
 377     do {
 378       each = free / adjustable.size();
 379       for (it = adjustable.begin(), end = adjustable.end(); it != end;) {
 380         std::list<Widget*>::iterator next = it; ++next;
 381         unsigned int m = (*it)->maxSize().height() - (*it)->minSize().height();
 382         if (m > 0 && m < each) {
 383           free -= m;
 384           if (free < 0) free = 0;
 385           adjustable.erase(it);
 386           break; // if one is found to be fixed, then the free space needs to
 387                  // change, and the rest need to be reexamined
 388         }
 389         it = next;
 390       }
 391     } while (it != end && !adjustable.empty());
 392   }
 393
 394   // place/size the widgets
 395   if (!adjustable.empty())
 396   each = free / adjustable.size();
 397   else
 398     each = 0;
 399   for (it = visible.begin(), end = visible.end(); it != end; ++it) {
 400     unsigned int h;
 401     // is the widget adjustable?
 402     std::list<Widget*>::const_iterator
 403       found = std::find(adjustable.begin(), adjustable.end(), *it);
 404     if (found != adjustable.end()) {
 405       // adjustable
 406       h = (*it)->minSize().height() + each;
 407     } else {
 408       // fixed
 409       h = (*it)->minSize().height();
 410     }
 411     // align it horizontally
 412     int xx = x;
 413     unsigned int ww = std::max(std::min(w, (*it)->_max_size.width()),
 414                                (*it)->_min_size.width());
 415     if (ww < w) {
 416       switch(_alignment) {
 417       case RenderStyle::RightBottomJustify:
 418         xx += w - ww;
 419         break;
 420       case RenderStyle::CenterJustify:
 421         xx += (w - ww) / 2;
 422         break;
 423       case RenderStyle::LeftTopJustify:
 424         break;
 425       }
 426     }
 427     (*it)->internal_moveresize(xx, y, ww, h);
 428     (*it)->render();
 429     (*it)->layout();
 430     y += h + _bevel;
 431   }
 432 }
 433
 434 void Widget::render()
 435 {
 436   if (!_texture || !_dirty) return;
 437   if ((unsigned)_borderwidth * 2 > _area.width() ||
 438       (unsigned)_borderwidth * 2 > _area.height())
 439     return; // no surface to draw on
 440
 441   Surface *s = new Surface(_screen, Size(_area.width() - _borderwidth * 2,
 442                                          _area.height() - _borderwidth * 2));
 443   display->renderControl(_screen)->drawBackground(*s, *_texture);
 444
 445   renderForeground(*s); // for inherited types to render onto the _surface
 446
 447   XSetWindowBackgroundPixmap(**display, _window, s->pixmap());
 448   XClearWindow(**display, _window);
 449
 450   // delete the old surface *after* its pixmap isn't in use anymore
 451   if (_surface) delete _surface;
 452
 453   _surface = s;
 454
 455   _dirty = false;
 456 }
 457
 458 void Widget::renderChildren()
 459 {
 460   std::list<Widget*>::iterator it, end = _children.end();
 461   for (it = _children.begin(); it != end; ++it)
 462     (*it)->render();
 463 }
 464
 465 void Widget::exposeHandler(const XExposeEvent &e)
 466 {
 467   EventHandler::exposeHandler(e);
 468   XClearArea(**display, _window, e.x, e.y, e.width, e.height, false);
 469 }
 470
 471 void Widget::configureHandler(const XConfigureEvent &e)
 472 {
 473   if (_ignore_config) {
 474     _ignore_config--;
 475   } else {
 476     // only interested in these for top level windows
 477     if (_parent) return;
 478
 479     XEvent ev;
 480     ev.xconfigure.width = e.width;
 481     ev.xconfigure.height = e.height;
 482     while (XCheckTypedWindowEvent(**display, window(), ConfigureNotify, &ev));
 483
 484     if (!((unsigned)ev.xconfigure.width == area().width() &&
 485           (unsigned)ev.xconfigure.height == area().height())) {
 486       _area = Rect(_area.position(), Size(e.width, e.height));
 487       update();
 488     }
 489   }
 490 }
 491
 492 }