lib/gui/ewidget.cpp

   1 #include <lib/gui/ewidget.h>
   2 #include <lib/gui/ewidgetdesktop.h>
   3
   4 extern void dumpRegion(const gRegion &region);
   5
   6 eWidget::eWidget(eWidget *parent): m_animation(this), m_parent(parent ? parent->child() : 0)
   7 {
   8         m_vis = 0;
   9         m_layer = 0;
  10         m_desktop = 0;
  11         m_have_background_color = 0;
  12         m_z_position = 0;
  13         m_client_offset = eSize(0, 0);
  14         if (m_parent)
  15                 m_vis = wVisShow;
  16         if (m_parent)
  17         {
  18                 insertIntoParent();
  19                 m_parent->getStyle(m_style);
  20         }
  21
  22         m_current_focus = 0;
  23         m_focus_owner = 0;
  24         m_notify_child_on_position_change = 1;
  25 }
  26
  27 void eWidget::move(ePoint pos)
  28 {
  29         pos = pos + m_client_offset;
  30         if (m_position == pos)
  31                 return;
  32
  33                         /* ?? what about native move support? */
  34         invalidate();
  35
  36         m_position = pos;
  37         event(evtChangedPosition);
  38         if (m_notify_child_on_position_change)
  39                 for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
  40                         i->event(evtParentChangedPosition);
  41                 recalcClipRegionsWhenVisible();
  42                 /* try native move if supported. */
  43         if ((m_vis & wVisShow) && ((!m_desktop) || m_desktop->movedWidget(this)))
  44                 invalidate();
  45 }
  46
  47 void eWidget::resize(eSize size)
  48 {
  49                 /* same strategy as with move: we first check if
  50                    the size changed at all, and if it did, we
  51                    invalidate both the old and new area.
  52                    TODO: check if either the old or new area
  53                    fits into the other completely, and invalidate
  54                    only once. */
  55         eSize old_size = m_size;
  56         eSize old_offset = m_client_offset;
  57         m_client_offset = eSize(0, 0);
  58         event(evtWillChangeSize, &size, &m_client_offset);
  59         if (old_size == m_size)
  60                 return;
  61         move(position() - old_offset);
  62         invalidate();
  63         event(evtChangedSize);
  64
  65         if (m_notify_child_on_position_change)
  66                 for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
  67                         i->event(evtParentChangedPosition); /* position/size is the same here */
  68
  69         recalcClipRegionsWhenVisible(); invalidate();
  70 }
  71
  72 void eWidget::invalidate(const gRegion &region)
  73 {
  74                 /* we determine the area to redraw, and re-position this
  75                    area to the absolute position, and then call the
  76                    desktop's invalidate() with that, which adds this
  77                    area into the dirty region. */
  78         gRegion res = m_visible_with_childs;
  79         if (region.valid())
  80                 res &= region;
  81
  82         if (res.empty())
  83                 return;
  84         eWidget *root = this;
  85         ePoint abspos = position();
  86         int target_layer = m_layer;
  87
  88         while (root && !root->m_desktop)
  89         {
  90                 root = root->m_parent;
  91                 assert(root);
  92                 if (root->m_layer != -1)
  93                         target_layer = root->m_layer;
  94                 abspos += root->position();
  95         }
  96         res.moveBy(abspos);
  97 //      eDebug("region to invalidate:");
  98 //      dumpRegion(res);
  99         root->m_desktop->invalidate(res, this, target_layer);
 100 }
 101
 102 void eWidget::show()
 103 {
 104         if (m_vis & wVisShow)
 105                 return;
 106
 107         m_vis |= wVisShow;
 108 //      eDebug("show widget %p", this);
 109         notifyShowHide();
 110
 111                 /* TODO: optimize here to only recalc what's required. possibly merge with hide. */
 112         eWidget *root = this;
 113         ePoint abspos = position();
 114         int target_layer = m_layer;
 115
 116         while (root && !root->m_desktop)
 117         {
 118                 root = root->m_parent;
 119                 if (!root)
 120                 {
 121                                 /* oops: our root widget does not have a desktop associated.
 122                                         probably somebody already erased the root, but tries some
 123                                         operations on a child window.
 124                                                                         ignore them for now. */
 125                         /* assert(root); */
 126                         return;
 127                 }
 128                 if (root->m_layer != -1)
 129                         target_layer = root->m_layer;
 130                 abspos += root->position();
 131         }
 132
 133         root->m_desktop->recalcClipRegions(root);
 134
 135         gRegion abs = m_visible_with_childs;
 136         abs.moveBy(abspos);
 137         root->m_desktop->invalidate(abs, this, target_layer);
 138 }
 139
 140 void eWidget::hide()
 141 {
 142                 /* TODO: when hiding an upper level widget, widgets get hidden but keep the */
 143                 /* wVisShow flag (because when the widget is shown again, the widgets must */
 144                 /* become visible again. */
 145         if (!(m_vis & wVisShow))
 146                 return;
 147         m_vis &= ~wVisShow;
 148
 149                 /* this is a workaround to the above problem. when we are in the delete phase,
 150                    don't hide childs. */
 151         if (!(m_parent || m_desktop))
 152                 return;
 153         notifyShowHide();
 154
 155                 /* TODO: optimize here to only recalc what's required. possibly merge with show. */
 156         eWidget *root = this;
 157         ePoint abspos = position();
 158         while (root && !root->m_desktop)
 159         {
 160                 root = root->m_parent;
 161                 if (!root)
 162                         return;
 163                 abspos += root->position();
 164         }
 165         assert(root->m_desktop);
 166
 167         gRegion abs = m_visible_with_childs;
 168         abs.moveBy(abspos);
 169
 170         root->m_desktop->recalcClipRegions(root);
 171         root->m_desktop->invalidate(abs);
 172 }
 173
 174 void eWidget::destruct()
 175 {
 176         if (m_parent)
 177                 m_parent->m_childs.remove(this);
 178         delete this;
 179 }
 180
 181 void eWidget::setBackgroundColor(const gRGB &col)
 182 {
 183         m_background_color = col;
 184         m_have_background_color = 1;
 185 }
 186
 187 void eWidget::clearBackgroundColor()
 188 {
 189         m_have_background_color = 0;
 190 }
 191
 192 void eWidget::setZPosition(int z)
 193 {
 194         m_z_position = z;
 195         if (!m_parent)
 196                 return;
 197         m_parent->m_childs.remove(this);
 198         insertIntoParent(); /* now at the new Z position */
 199 }
 200
 201 void eWidget::setTransparent(int transp)
 202 {
 203         if (isTransparent() != transp)
 204         {
 205                 if (transp)
 206                         m_vis |= wVisTransparent;
 207                 else
 208                         m_vis &=~wVisTransparent;
 209                 recalcClipRegionsWhenVisible();
 210         }
 211 }
 212
 213 ePoint eWidget::getAbsolutePosition()
 214 {
 215         eWidget *root = this;
 216         ePoint abspos = position();
 217
 218         while (root && !root->m_desktop)
 219         {
 220                 root = root->m_parent;
 221                 assert(root);
 222                 abspos += root->position();
 223         }
 224
 225         return abspos;
 226 }
 227
 228 void eWidget::mayKillFocus()
 229 {
 230         setFocus(0);
 231                 /* when we have the focus, remove it first. */
 232         if (m_focus_owner)
 233                 m_focus_owner->setFocus(0);
 234 }
 235
 236 eWidget::~eWidget()
 237 {
 238         hide();
 239         if (m_parent)
 240                 m_parent->m_childs.remove(this);
 241
 242         m_parent = 0;
 243
 244                 /* tell all childs that the parent is not anymore existing */
 245         ePtrList<eWidget>::iterator i(m_childs.begin());
 246         while (i != m_childs.end())
 247         {
 248                 (*i)->parentRemoved();
 249                 i = m_childs.erase(i);
 250         }
 251 }
 252
 253 void eWidget::insertIntoParent()
 254 {
 255         ePtrList<eWidget>::iterator i = m_parent->m_childs.begin();
 256         for(;;)
 257         {
 258                 if ((i == m_parent->m_childs.end()) || (i->m_z_position > m_z_position))
 259                 {
 260                         m_parent->m_childs.insert(i, this);
 261                         return;
 262                 }
 263                 ++i;
 264         }
 265 }
 266
 267 void eWidget::doPaint(gPainter &painter, const gRegion &r, int layer)
 268 {
 269         if (m_visible_with_childs.empty())
 270                 return;
 271         gRegion region = r, childs = r;
 272                         /* we were in parent's space, now we are in local space */
 273         region.moveBy(-position());
 274         painter.moveOffset(position());
 275                 /* check if there's anything for us to paint */
 276         if (layer == m_layer)
 277         {
 278                 region &= m_visible_region;
 279                 if (!region.empty())
 280                 {
 281                         painter.resetClip(region);
 282                         event(evtPaint, &region, &painter);
 283                 }
 284         }
 285
 286         childs.moveBy(-position());
 287                 /* walk all childs */
 288         for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
 289                 i->doPaint(painter, childs, layer);
 290         painter.moveOffset(-position());
 291 }
 292
 293 void eWidget::recalcClipRegionsWhenVisible()
 294 {
 295         eWidget *t = this;
 296         do
 297         {
 298                 if (!(t->m_vis & wVisShow))
 299                         break;
 300                 if (t->m_desktop)
 301                 {
 302                         t->m_desktop->recalcClipRegions(t);
 303                         break;
 304                 }
 305                 t = t->m_parent;
 306                 assert(t);
 307         } while(1);
 308 }
 309
 310 void eWidget::parentRemoved()
 311 {
 312         m_parent = 0;
 313 }
 314
 315 int eWidget::event(int event, void *data, void *data2)
 316 {
 317         switch (event)
 318         {
 319         case evtPaint:
 320         {
 321                 gPainter &painter = *(gPainter*)data2;
 322         //              eDebug("eWidget::evtPaint");
 323 //              dumpRegion(*(gRegion*)data);
 324                 if (!isTransparent())
 325                 {
 326                         if (!m_have_background_color)
 327                         {
 328                                 ePtr<eWindowStyle> style;
 329                                 if (!getStyle(style))
 330                                         style->paintBackground(painter, ePoint(0, 0), size());
 331                         } else
 332                         {
 333                                 painter.setBackgroundColor(m_background_color);
 334                                 painter.clear();
 335                         }
 336                 } else
 337                 {
 338                         eWidget *w = this;
 339                                         while (w && !w->m_have_background_color)
 340                                 w = w->m_parent;
 341
 342                         if (w)
 343                                 painter.setBackgroundColor(w->m_background_color);
 344                 }
 345                 break;
 346         }
 347         case evtKey:
 348                 break;
 349         case evtWillChangeSize:
 350                 m_size = *static_cast<eSize*>(data);
 351                 break;
 352         case evtChangedSize:
 353                 m_clip_region = gRegion(eRect(ePoint(0, 0),  m_size));
 354                 break;
 355         case evtParentChangedPosition:
 356                 for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
 357                         i->event(evtParentChangedPosition);
 358                 break;
 359         case evtFocusGot:
 360                 m_focus_owner = (eWidget*)data;
 361                 break;
 362         case evtFocusLost:
 363                 m_focus_owner = 0;
 364                 break;
 365         default:
 366                 return -1;
 367         }
 368         return 0;
 369 }
 370
 371 void eWidget::setFocus(eWidget *focus)
 372 {
 373         if (m_current_focus)
 374                 m_current_focus->event(evtFocusLost, this);
 375         m_current_focus = focus;
 376
 377         if (m_current_focus)
 378                 m_current_focus->event(evtFocusGot, this);
 379 }
 380
 381 void eWidget::notifyShowHide()
 382 {
 383         event(evtParentVisibilityChanged);
 384         for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
 385                 i->notifyShowHide();
 386 }