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 //      eDebug("show widget %p", this);
 104         notifyShowHide();
 105
 106                 /* TODO: optimize here to only recalc what's required. possibly merge with hide. */
 107         eWidget *root = this;
 108         ePoint abspos = position();
 109         while (root && !root->m_desktop)
 110         {
 111                 root = root->m_parent;
 112                 if (!root)
 113                 {
 114                                 /* oops: our root widget does not have a desktop associated.
 115                                         probably somebody already erased the root, but tries some
 116                                         operations on a child window.
 117                                                                         ignore them for now. */
 118                         /* assert(root); */
 119                         return;
 120                 }
 121                 abspos += root->position();
 122         }
 123
 124         root->m_desktop->recalcClipRegions(root);
 125
 126         gRegion abs = m_visible_with_childs;
 127         abs.moveBy(abspos);
 128         root->m_desktop->invalidate(abs);
 129 }
 130
 131 void eWidget::hide()
 132 {
 133                 /* TODO: when hiding an upper level widget, widgets get hidden but keep the */
 134                 /* wVisShow flag (because when the widget is shown again, the widgets must */
 135                 /* become visible again. */
 136         if (!(m_vis & wVisShow))
 137                 return;
 138         m_vis &= ~wVisShow;
 139
 140                 /* this is a workaround to the above problem. when we are in the delete phase,
 141                    don't hide childs. */
 142         if (!(m_parent || m_desktop))
 143                 return;
 144         notifyShowHide();
 145
 146                 /* TODO: optimize here to only recalc what's required. possibly merge with show. */
 147         eWidget *root = this;
 148         ePoint abspos = position();
 149         while (root && !root->m_desktop)
 150         {
 151                 root = root->m_parent;
 152                 if (!root)
 153                         return;
 154                 abspos += root->position();
 155         }
 156         assert(root->m_desktop);
 157
 158         gRegion abs = m_visible_with_childs;
 159         abs.moveBy(abspos);
 160
 161         root->m_desktop->recalcClipRegions(root);
 162         root->m_desktop->invalidate(abs);
 163 }
 164
 165 void eWidget::destruct()
 166 {
 167         if (m_parent)
 168                 m_parent->m_childs.remove(this);
 169         delete this;
 170 }
 171
 172 void eWidget::setBackgroundColor(const gRGB &col)
 173 {
 174         m_background_color = col;
 175         m_have_background_color = 1;
 176 }
 177
 178 void eWidget::clearBackgroundColor()
 179 {
 180         m_have_background_color = 0;
 181 }
 182
 183 void eWidget::setZPosition(int z)
 184 {
 185         m_z_position = z;
 186         if (!m_parent)
 187                 return;
 188         m_parent->m_childs.remove(this);
 189         insertIntoParent(); /* now at the new Z position */
 190 }
 191
 192 void eWidget::setTransparent(int transp)
 193 {
 194         if (isTransparent() != transp)
 195         {
 196                 if (transp)
 197                         m_vis |= wVisTransparent;
 198                 else
 199                         m_vis &=~wVisTransparent;
 200                 recalcClipRegionsWhenVisible();
 201         }
 202 }
 203
 204 ePoint eWidget::getAbsolutePosition()
 205 {
 206         eWidget *root = this;
 207         ePoint abspos = position();
 208
 209         while (root && !root->m_desktop)
 210         {
 211                 root = root->m_parent;
 212                 assert(root);
 213                 abspos += root->position();
 214         }
 215
 216         return abspos;
 217 }
 218
 219 void eWidget::mayKillFocus()
 220 {
 221         setFocus(0);
 222                 /* when we have the focus, remove it first. */
 223         if (m_focus_owner)
 224                 m_focus_owner->setFocus(0);
 225 }
 226
 227 eWidget::~eWidget()
 228 {
 229         hide();
 230         if (m_parent)
 231                 m_parent->m_childs.remove(this);
 232
 233         m_parent = 0;
 234
 235                 /* tell all childs that the parent is not anymore existing */
 236         ePtrList<eWidget>::iterator i(m_childs.begin());
 237         while (i != m_childs.end())
 238         {
 239                 (*i)->parentRemoved();
 240                 i = m_childs.erase(i);
 241         }
 242 }
 243
 244 void eWidget::insertIntoParent()
 245 {
 246         ePtrList<eWidget>::iterator i = m_parent->m_childs.begin();
 247         for(;;)
 248         {
 249                 if ((i == m_parent->m_childs.end()) || (i->m_z_position > m_z_position))
 250                 {
 251                         m_parent->m_childs.insert(i, this);
 252                         return;
 253                 }
 254                 ++i;
 255         }
 256 }
 257
 258 void eWidget::doPaint(gPainter &painter, const gRegion &r)
 259 {
 260         if (m_visible_with_childs.empty())
 261                 return;
 262         gRegion region = r, childs = r;
 263                         /* we were in parent's space, now we are in local space */
 264         region.moveBy(-position());
 265         painter.moveOffset(position());
 266                 /* check if there's anything for us to paint */
 267         region &= m_visible_region;
 268         if (!region.empty())
 269         {
 270                 painter.resetClip(region);
 271                 event(evtPaint, &region, &painter);
 272         }
 273
 274         childs.moveBy(-position());
 275                 /* walk all childs */
 276         for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
 277                 i->doPaint(painter, childs);
 278         painter.moveOffset(-position());
 279 }
 280
 281 void eWidget::recalcClipRegionsWhenVisible()
 282 {
 283         eWidget *t = this;
 284         do
 285         {
 286                 if (!(t->m_vis & wVisShow))
 287                         break;
 288                 if (t->m_desktop)
 289                 {
 290                         t->m_desktop->recalcClipRegions(t);
 291                         break;
 292                 }
 293                 t = t->m_parent;
 294                 assert(t);
 295         } while(1);
 296 }
 297
 298 void eWidget::parentRemoved()
 299 {
 300         m_parent = 0;
 301 }
 302
 303 int eWidget::event(int event, void *data, void *data2)
 304 {
 305         switch (event)
 306         {
 307         case evtPaint:
 308         {
 309                 gPainter &painter = *(gPainter*)data2;
 310         //              eDebug("eWidget::evtPaint");
 311 //              dumpRegion(*(gRegion*)data);
 312                 if (!isTransparent())
 313                 {
 314                         if (!m_have_background_color)
 315                         {
 316                                 ePtr<eWindowStyle> style;
 317                                 if (!getStyle(style))
 318                                         style->paintBackground(painter, ePoint(0, 0), size());
 319                         } else
 320                         {
 321                                 painter.setBackgroundColor(m_background_color);
 322                                 painter.clear();
 323                         }
 324                 } else
 325                 {
 326                         eWidget *w = this;
 327                                         while (w && !w->m_have_background_color)
 328                                 w = w->m_parent;
 329
 330                         if (w)
 331                                 painter.setBackgroundColor(w->m_background_color);
 332                 }
 333                 break;
 334         }
 335         case evtKey:
 336                 break;
 337         case evtWillChangeSize:
 338                 m_size = *static_cast<eSize*>(data);
 339                 break;
 340         case evtChangedSize:
 341                 m_clip_region = gRegion(eRect(ePoint(0, 0),  m_size));
 342                 break;
 343         case evtParentChangedPosition:
 344                 for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
 345                         i->event(evtParentChangedPosition);
 346                 break;
 347         case evtFocusGot:
 348                 m_focus_owner = (eWidget*)data;
 349                 break;
 350         case evtFocusLost:
 351                 m_focus_owner = 0;
 352                 break;
 353         default:
 354                 return -1;
 355         }
 356         return 0;
 357 }
 358
 359 void eWidget::setFocus(eWidget *focus)
 360 {
 361         if (m_current_focus)
 362                 m_current_focus->event(evtFocusLost, this);
 363         m_current_focus = focus;
 364
 365         if (m_current_focus)
 366                 m_current_focus->event(evtFocusGot, this);
 367 }
 368
 369 void eWidget::notifyShowHide()
 370 {
 371         event(evtParentVisibilityChanged);
 372         for (ePtrList<eWidget>::iterator i(m_childs.begin()); i != m_childs.end(); ++i)
 373                 i->notifyShowHide();
 374 }