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