khtml Library API Documentation

khtml_caret.cpp

00001 /* This file is part of the KDE project
00002  *
00003  * Copyright (C) 2003-2004 Leo Savernik <l.savernik@aon.at>
00004  *
00005  * This library is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU Library General Public
00007  * License as published by the Free Software Foundation; either
00008  * version 2 of the License, or (at your option) any later version.
00009  *
00010  * This library is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Library General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Library General Public License
00016  * along with this library; see the file COPYING.LIB.  If not, write to
00017  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00018  * Boston, MA 02111-1307, USA.
00019  */
00020 
00021 
00022 #include "khtml_caret_p.h"
00023 
00024 #include "html/html_documentimpl.h"
00025 
00026 namespace khtml {
00027 
00035 enum ObjectAdvanceState {
00036   LeftObject = 0x01, AdvancedToSibling = 0x02, EnteredObject = 0x04
00037 };
00038 
00047 enum ObjectTraversalState {
00048   OutsideDescending, InsideDescending, InsideAscending, OutsideAscending
00049 };
00050 
00060 static RenderObject* traverseRenderObjects(RenderObject *obj,
00061         ObjectTraversalState &trav, bool toBegin, RenderObject *base,
00062                 int &state)
00063 {
00064   RenderObject *r;
00065   switch (trav) {
00066     case OutsideDescending:
00067       trav = InsideDescending;
00068       break;
00069     case InsideDescending:
00070       r = toBegin ? obj->lastChild() : obj->firstChild();
00071       if (r) {
00072         trav = OutsideDescending;
00073         obj = r;
00074         state |= EnteredObject;
00075       } else {
00076         trav = InsideAscending;
00077       }
00078       break;
00079     case InsideAscending:
00080       trav = OutsideAscending;
00081       break;
00082     case OutsideAscending:
00083       r = toBegin ? obj->previousSibling() : obj->nextSibling();
00084       if (r) {
00085         trav = OutsideDescending;
00086         state |= AdvancedToSibling;
00087       } else {
00088         r = obj->parent();
00089         if (r == base) r = 0;
00090         trav = InsideAscending;
00091         state |= LeftObject;
00092       }
00093       obj = r;
00094       break;
00095   }/*end switch*/
00096 
00097   return obj;
00098 }
00099 
00105 static inline RenderObject *renderObjectBelow(RenderObject *obj, ObjectTraversalState &trav, RenderObject *base)
00106 {
00107   trav = InsideDescending;
00108   int state;        // we don't need the state, so we don't initialize it
00109   RenderObject *r = obj;
00110   while (r && trav != OutsideDescending) {
00111     r = traverseRenderObjects(r, trav, false, base, state);
00112 #if DEBUG_CARETMODE > 3
00113     kdDebug(6200) << "renderObjectBelow: r " << r << " trav " << trav << endl;
00114 #endif
00115   }
00116   trav = InsideDescending;
00117   return r;
00118 }
00119 
00125 static inline RenderObject *renderObjectAbove(RenderObject *obj, ObjectTraversalState &trav, RenderObject *base)
00126 {
00127   trav = OutsideAscending;
00128   int state;        // we don't need the state, so we don't initialize it
00129   RenderObject *r = obj;
00130   while (r && trav != InsideAscending) {
00131     r = traverseRenderObjects(r, trav, true, base, state);
00132 #if DEBUG_CARETMODE > 3
00133     kdDebug(6200) << "renderObjectAbove: r " << r << " trav " << trav << endl;
00134 #endif
00135   }
00136   trav = InsideAscending;
00137   return r;
00138 }
00139 
00144 static inline bool isIndicatedInlineBox(InlineBox *box)
00145 {
00146   // text boxes are never indicated.
00147   if (box->isInlineTextBox()) return false;
00148   RenderStyle *s = box->object()->style();
00149   return s->borderLeftWidth() || s->borderRightWidth()
00150     || s->borderTopWidth() || s->borderBottomWidth()
00151     || s->paddingLeft().value() || s->paddingRight().value()
00152     || s->paddingTop().value() || s->paddingBottom().value()
00153     // ### Can inline elements have top/bottom margins? Couldn't find
00154     // it in the CSS 2 spec, but Mozilla ignores them, so we do, too.
00155     || s->marginLeft().value() || s->marginRight().value();
00156 }
00157 
00162 static inline bool isIndicatedFlow(RenderObject *r)
00163 {
00164   RenderStyle *s = r->style();
00165   return s->borderLeftStyle() != BNONE || s->borderRightStyle() != BNONE
00166     || s->borderTopStyle() != BNONE || s->borderBottomStyle() != BNONE
00167 //  || s->paddingLeft().value() || s->paddingRight().value()
00168 //  || s->paddingTop().value() || s->paddingBottom().value()
00169 //  || s->marginLeft().value() || s->marginRight().value()
00170     || s->hasClip() || s->overflow() != OVISIBLE
00171     || s->backgroundColor().isValid() || s->backgroundImage();
00172 }
00173 
00187 static RenderObject *advanceObject(RenderObject *r,
00188         ObjectTraversalState &trav, bool toBegin,
00189                 RenderObject *base, int &state)
00190 {
00191 
00192   ObjectTraversalState origtrav = trav;
00193   RenderObject *a = traverseRenderObjects(r, trav, toBegin, base, state);
00194 
00195   bool ignoreOutsideDesc = toBegin && origtrav == OutsideAscending;
00196 
00197   // render object and traversal state at which look ahead has been started
00198   RenderObject *la = 0;
00199   ObjectTraversalState latrav = trav;
00200   ObjectTraversalState lasttrav = origtrav;
00201 
00202   while (a) {
00203 #if DEBUG_CARETMODE > 5
00204 kdDebug(6200) << "a " << a << " trav " << trav << endl;
00205 #endif
00206     if (a->element()) {
00207 #if DEBUG_CARETMODE > 4
00208 kdDebug(6200) << "a " << a << " trav " << trav << " origtrav " << origtrav << " ignoreOD " << ignoreOutsideDesc << endl;
00209 #endif
00210       if (toBegin) {
00211 
00212         switch (origtrav) {
00213       case OutsideDescending:
00214             if (trav == InsideAscending) return a;
00215         if (trav == OutsideDescending) return a;
00216         break;
00217           case InsideDescending:
00218         if (trav == OutsideDescending) return a;
00219         // fall through
00220           case InsideAscending:
00221             if (trav == OutsideAscending) return a;
00222         break;
00223       case OutsideAscending:
00224         if (trav == OutsideAscending) return a;
00225             if (trav == InsideAscending && lasttrav == InsideDescending) return a;
00226         if (trav == OutsideDescending && !ignoreOutsideDesc) return a;
00227         // ignore this outside descending position, as it effectively
00228         // demarkates the same position, but remember it in case we fall off
00229         // the document.
00230         la = a; latrav = trav;
00231         ignoreOutsideDesc = false;
00232         break;
00233         }/*end switch*/
00234 
00235       } else {
00236 
00237         switch (origtrav) {
00238       case OutsideDescending:
00239             if (trav == InsideAscending) return a;
00240         if (trav == OutsideDescending) return a;
00241         break;
00242           case InsideDescending:
00243 //      if (trav == OutsideDescending) return a;
00244         // fall through
00245           case InsideAscending:
00246 //            if (trav == OutsideAscending) return a;
00247 //      break;
00248       case OutsideAscending:
00249         // ### what if origtrav == OA, and immediately afterwards trav
00250         // becomes OD? In this case the effective position hasn't changed ->
00251         // the caret gets stuck. Otherwise, it apparently cannot happen in
00252         // real usage patterns.
00253         if (trav == OutsideDescending) return a;
00254         if (trav == OutsideAscending) {
00255           if (la) return la;
00256               // starting lookahead here. Remember old object in case we fall off
00257           // the document.
00258           la = a; latrav = trav;
00259         }
00260         break;
00261     }/*end switch*/
00262 
00263       }/*end if*/
00264     }/*end if*/
00265 
00266     lasttrav = trav;
00267     a = traverseRenderObjects(a, trav, toBegin, base, state);
00268   }/*wend*/
00269 
00270   if (la) trav = latrav, a = la;
00271   return a;
00272 
00273 }
00274 
00283 static inline bool isUnsuitable(RenderObject *r, ObjectTraversalState /*trav*/)
00284 {
00285   if (!r) return false;
00286   return r->isTableCol() || r->isTableSection() || r->isTableRow()
00287     || (r->isText() && static_cast<RenderText *>(r)->inlineTextBoxCount() == 0);
00288       ;
00289 }
00290 
00304 static inline RenderObject *advanceSuitableObject(RenderObject *r,
00305         ObjectTraversalState &trav, bool toBegin,
00306         RenderObject *base, int &state)
00307 {
00308   do {
00309     r = advanceObject(r, trav, toBegin, base, state);
00310 #if DEBUG_CARETMODE > 2
00311     kdDebug(6200) << "after advanceSWP: r " << r << " trav " << trav << " toBegin " << toBegin << endl;
00312 #endif
00313   } while (isUnsuitable(r, trav));
00314   return r;
00315 }
00316 
00326 static NodeImpl *nextLeafNode(NodeImpl *r, NodeImpl *baseElem)
00327 {
00328   NodeImpl *n = r->firstChild();
00329   if (n) {
00330     while (n) { r = n; n = n->firstChild(); }
00331     return const_cast<NodeImpl *>(r);
00332   }/*end if*/
00333   n = r->nextSibling();
00334   if (n) {
00335     r = n;
00336     while (n) { r = n; n = n->firstChild(); }
00337     return const_cast<NodeImpl *>(r);
00338   }/*end if*/
00339 
00340   n = r->parentNode();
00341   if (n == baseElem) n = 0;
00342   while (n) {
00343     r = n;
00344     n = r->nextSibling();
00345     if (n) {
00346       r = n;
00347       n = r->firstChild();
00348       while (n) { r = n; n = n->firstChild(); }
00349       return const_cast<NodeImpl *>(r);
00350     }/*end if*/
00351     n = r->parentNode();
00352     if (n == baseElem) n = 0;
00353   }/*wend*/
00354   return 0;
00355 }
00356 
00357 #if 0       // currently not used
00358 
00367 static NodeImpl *prevLeafNode(NodeImpl *r, NodeImpl *baseElem)
00368 {
00369   NodeImpl *n = r->firstChild();
00370   if (n) {
00371     while (n) { r = n; n = n->firstChild(); }
00372     return const_cast<NodeImpl *>(r);
00373   }/*end if*/
00374   n = r->previousSibling();
00375   if (n) {
00376     r = n;
00377     while (n) { r = n; n = n->firstChild(); }
00378     return const_cast<NodeImpl *>(r);
00379   }/*end if*/
00380 
00381   n = r->parentNode();
00382   if (n == baseElem) n = 0;
00383   while (n) {
00384     r = n;
00385     n = r->previousSibling();
00386     if (n) {
00387       r = n;
00388       n = r->lastChild();
00389       while (n) { r = n; n = n->lastChild(); }
00390       return const_cast<NodeImpl *>(r);
00391     }/*end if*/
00392     n = r->parentNode();
00393     if (n == baseElem) n = 0;
00394   }/*wend*/
00395   return 0;
00396 }
00397 #endif
00398 
00410 void /*KDE_NO_EXPORT*/ mapDOMPosToRenderPos(NodeImpl *node, long offset,
00411         RenderObject *&r, long &r_ofs, bool &outside, bool &outsideEnd)
00412 {
00413   if (node->nodeType() == Node::TEXT_NODE) {
00414     outside = false;
00415     outsideEnd = false;
00416     r = node->renderer();
00417     r_ofs = offset;
00418   } else if (node->nodeType() == Node::ELEMENT_NODE || node->nodeType() == Node::DOCUMENT_NODE) {
00419 
00420     // Though offset points between two children, attach it to the visually
00421     // most suitable one (and only there, because the mapping must stay bijective)
00422     if (node->firstChild()) {
00423       outside = true;
00424       NodeImpl *child = offset <= 0 ? node->firstChild()
00425                     // childNode is expensive
00426                     : node->childNode((unsigned long)offset);
00427       // index was child count or out of bounds
00428       bool atEnd = !child;
00429 #if DEBUG_CARETMODE > 5
00430       kdDebug(6200) << "mapDTR: child " << child << "@" << (child ? child->nodeName().string() : QString::null) << " atEnd " << atEnd << endl;
00431 #endif
00432       if (atEnd) child = node->lastChild();
00433 
00434       r = child->renderer();
00435       r_ofs = 0;
00436       outsideEnd = atEnd;
00437 
00438       // Outside text nodes most likely stem from a continuation. Seek
00439       // the enclosing continued render object and use this one instead.
00440       if (r && child->nodeType() == Node::TEXT_NODE) {
00441         r = r->parent();
00442         RenderObject *o = node->renderer();
00443     while (o->continuation() && o->continuation() != r)
00444       o = o->continuation();
00445     if (!r || o->continuation() != r) {
00446       r = child->renderer();
00447     }
00448       }/*end if*/
00449       
00450       // BRs cause troubles. Returns the previous render object instead,
00451       // giving it the attributes outside, outside end.
00452       if (r && r->isBR()) {
00453         r = r->objectAbove();
00454         outsideEnd = true;
00455       }/*end if*/
00456 
00457     } else {
00458       // Element has no children, treat offset to be inside the node.
00459       outside = false;
00460       outsideEnd = false;
00461       r = node->renderer();
00462       r_ofs = 0;    // only offset 0 possible
00463     }
00464 
00465   } else {
00466     r = 0;
00467     kdWarning() << k_funcinfo << "Mapping from nodes of type " << node->nodeType()
00468         << " not supported!" << endl;
00469   }
00470 }
00471 
00482 void /*KDE_NO_EXPORT*/ mapRenderPosToDOMPos(RenderObject *r, long r_ofs,
00483         bool outside, bool outsideEnd, NodeImpl *&node, long &offset)
00484 {
00485   node = r->element();
00486   Q_ASSERT(node);
00487 #if DEBUG_CARETMODE > 5
00488       kdDebug(6200) << "mapRTD: r " << r << "@" << (r ? r->renderName() : QString::null) << (r && r->element() ? QString(".node ") + QString::number((unsigned)r->element(),16) + "@" + r->element()->nodeName().string() : QString::null) << " outside " << outside << " outsideEnd " << outsideEnd << endl;
00489 #endif
00490   if (node->nodeType() == Node::ELEMENT_NODE || node->nodeType() == Node::TEXT_NODE) {
00491 
00492     if (outside) {
00493       NodeImpl *parent = node->parent();
00494 
00495       // If this is part of a continuation, use the actual node as the parent,
00496       // and the first render child as the node.
00497       if (r != node->renderer()) {
00498         RenderObject *o = node->renderer();
00499     while (o->continuation() && o->continuation() != r)
00500       o = o->continuation();
00501     if (o->continuation() == r) {
00502       parent = node;
00503       // ### What if the first render child does not map to a child of
00504       // the continued node?
00505       node = r->firstChild() ? r->firstChild()->element() : node;
00506     }
00507       }/*end if*/
00508 
00509       if (!parent) goto inside;
00510 
00511       offset = (long)node->nodeIndex() + outsideEnd;
00512       node = parent;
00513 #if DEBUG_CARETMODE > 5
00514    kdDebug(6200) << node << "@" << (node ? node->nodeName().string() : QString::null) << " offset " << offset << endl;
00515 #endif
00516     } else {    // !outside
00517 inside:
00518       offset = r_ofs;
00519     }
00520 
00521   } else {
00522     offset = 0;
00523     kdWarning() << k_funcinfo << "Mapping to nodes of type " << node->nodeType()
00524         << " not supported!" << endl;
00525   }
00526 }
00527 
00529 static inline void ensureLeafNode(NodeImpl *&node, NodeImpl *base)
00530 {
00531   if (node && node->hasChildNodes()) node = nextLeafNode(node, base);
00532 }
00533 
00540 static inline void mapRenderPosToTraversalState(bool outside, bool atEnd,
00541         bool toBegin, ObjectTraversalState &trav)
00542 {
00543   if (!outside) atEnd = !toBegin;
00544   if (!atEnd ^ toBegin)
00545     trav = outside ? OutsideDescending : InsideDescending;
00546   else
00547     trav = outside ? OutsideAscending : InsideAscending;
00548 }
00549 
00556 static inline void mapTraversalStateToRenderPos(ObjectTraversalState trav,
00557         bool toBegin, bool &outside, bool &atEnd)
00558 {
00559   outside = false;
00560   switch (trav) {
00561     case OutsideDescending: outside = true; // fall through
00562     case InsideDescending: atEnd = toBegin; break;
00563     case OutsideAscending: outside = true; // fall through
00564     case InsideAscending: atEnd = !toBegin; break;
00565   }
00566 }
00567 
00583 static RenderObject* findRenderer(NodeImpl *&node, long offset,
00584             RenderObject *base, long &r_ofs,
00585                         bool &outside, bool &outsideEnd)
00586 {
00587   if (!node) return 0;
00588   RenderObject *r;
00589   mapDOMPosToRenderPos(node, offset, r, r_ofs, outside, outsideEnd);
00590 #if DEBUG_CARETMODE > 2
00591    kdDebug(6200) << "findRenderer: node " << node << " " << (node ? node->nodeName().string() : QString::null) << " offset " << offset << " r " << r << "[" << (r ? r->renderName() : QString::null) << "] r_ofs " << r_ofs << " outside " << outside << " outsideEnd " << outsideEnd << endl;
00592 #endif
00593   if (r) return r;
00594   NodeImpl *baseElem = base ? base->element() : 0;
00595   while (!r) {
00596     node = nextLeafNode(node, baseElem);
00597     if (!node) break;
00598     r = node->renderer();
00599     if (r) r_ofs = offset;
00600   }
00601 #if DEBUG_CARETMODE > 3
00602   kdDebug(6200) << "1r " << r << endl;
00603 #endif
00604   ObjectTraversalState trav;
00605   int state;        // not used
00606   mapRenderPosToTraversalState(outside, outsideEnd, false, trav);
00607   if (r && isUnsuitable(r, trav)) {
00608     r = advanceSuitableObject(r, trav, false, base, state);
00609     mapTraversalStateToRenderPos(trav, false, outside, outsideEnd);
00610     if (r) r_ofs = r->minOffset();
00611   }
00612 #if DEBUG_CARETMODE > 3
00613   kdDebug(6200) << "2r " << r << endl;
00614 #endif
00615   return r;
00616 }
00617 
00621 static ElementImpl *determineBaseElement(NodeImpl *caretNode)
00622 {
00623   // ### for now, only body is delivered for html documents,
00624   // and 0 for xml documents.
00625 
00626   DocumentImpl *doc = caretNode->getDocument();
00627   if (!doc) return 0;   // should not happen, but who knows.
00628 
00629   if (doc->isHTMLDocument())
00630     return static_cast<HTMLDocumentImpl *>(doc)->body();
00631 
00632   return 0;
00633 }
00634 
00635 // == class CaretBox implementation
00636 
00637 #if DEBUG_CARETMODE > 0
00638 void CaretBox::dump(QTextStream &ts, const QString &ind) const
00639 {
00640   ts << ind << "b@" << _box;
00641 
00642   if (_box) {
00643     ts << "<" << _box->object() << ":" << _box->object()->renderName() << ">";
00644   }/*end if*/
00645 
00646   ts << " " << _x << "+" << _y << "+" << _w << "*" << _h;
00647 
00648   ts << " cb@" << cb;
00649   if (cb) ts << ":" << cb->renderName();
00650 
00651   ts << " " << (_outside ? (outside_end ? "oe" : "o-") : "i-");
00652 //  ts << endl;
00653 }
00654 #endif
00655 
00656 // == class CaretBoxLine implementation
00657 
00658 #if DEBUG_CARETMODE > 0
00659 #  define DEBUG_ACIB 1
00660 #else
00661 #  define DEBUG_ACIB DEBUG_CARETMODE
00662 #endif
00663 void CaretBoxLine::addConvertedInlineBox(InlineBox *box, SeekBoxParams &sbp) /*KDE_NO_EXPORT*/
00664 {
00665   // Generate only one outside caret box between two elements. If
00666   // coalesceOutsideBoxes is true, generating left outside boxes is inhibited.
00667   bool coalesceOutsideBoxes = false;
00668   CaretBoxIterator lastCoalescedBox;
00669   for (; box; box = box->nextOnLine()) {
00670 #if DEBUG_ACIB
00671 kdDebug(6200) << "box " << box << endl;
00672 kdDebug(6200) << "box->object " << box->object() << endl;
00673 kdDebug(6200) << "x " << box->m_x << " y " << box->m_y << " w " << box->m_width << " h " << box->m_height << " baseline " << box->m_baseline << " ifb " << box->isInlineFlowBox() << " itb " << box->isInlineTextBox() << " rlb " << box->isRootInlineBox() << endl;
00674 #endif
00675     // ### Why the hell can object() ever be 0?!
00676     if (!box->object()) continue;
00677 
00678     RenderStyle *s = box->object()->style(box->m_firstLine);
00679     // parent style for outside caret boxes
00680     RenderStyle *ps = box->parent() && box->parent()->object()
00681             ? box->parent()->object()->style(box->parent()->m_firstLine)
00682         : s;
00683 
00684     if (box->isInlineFlowBox()) {
00685 #if DEBUG_ACIB
00686 kdDebug(6200) << "isinlineflowbox " << box << endl;
00687 #endif
00688       InlineFlowBox *flowBox = static_cast<InlineFlowBox *>(box);
00689       bool rtl = ps->direction() == RTL;
00690       const QFontMetrics &pfm = ps->fontMetrics();
00691 
00692       if (flowBox->includeLeftEdge()) {
00693         // If this box is to be coalesced with the outside end box of its
00694         // predecessor, then check if it is the searched box. If it is, we
00695         // substitute the outside end box.
00696         if (coalesceOutsideBoxes) {
00697           if (sbp.equalsBox(flowBox, true, false)) {
00698             sbp.it = lastCoalescedBox;
00699             Q_ASSERT(!sbp.found);
00700             sbp.found = true;
00701           }
00702         } else {
00703           addCreatedFlowBoxEdge(flowBox, pfm, true, rtl);
00704           sbp.check(preEnd());
00705         }
00706       }/*end if*/
00707 
00708       if (flowBox->firstChild()) {
00709 #if DEBUG_ACIB
00710 kdDebug(6200) << "this " << this << " flowBox " << flowBox << " firstChild " << flowBox->firstChild() << endl;
00711 kdDebug(6200) << "== recursive invocation" << endl;
00712 #endif
00713         addConvertedInlineBox(flowBox->firstChild(), sbp);
00714 #if DEBUG_ACIB
00715 kdDebug(6200) << "== recursive invocation end" << endl;
00716 #endif
00717 }
00718       else {
00719         addCreatedFlowBoxInside(flowBox, s->fontMetrics());
00720         sbp.check(preEnd());
00721       }
00722 
00723       if (flowBox->includeRightEdge()) {
00724         addCreatedFlowBoxEdge(flowBox, pfm, false, rtl);
00725         lastCoalescedBox = preEnd();
00726         sbp.check(lastCoalescedBox);
00727         coalesceOutsideBoxes = true;
00728       }
00729 
00730     } else if (box->isInlineTextBox()) {
00731 #if DEBUG_ACIB
00732 kdDebug(6200) << "isinlinetextbox " << box << (box->object() ? QString(" contains \"%1\"").arg(QConstString(static_cast<RenderText *>(box->object())->str->s+box->minOffset(), kMin(box->maxOffset() - box->minOffset(), 15L)).string()) : QString::null) << endl;
00733 #endif
00734       caret_boxes.append(new CaretBox(box, false, false));
00735       sbp.check(preEnd());
00736       // coalescing has been interrupted
00737       coalesceOutsideBoxes = false;
00738 
00739     } else {
00740 #if DEBUG_ACIB
00741 kdDebug(6200) << "some replaced or what " << box << endl;
00742 #endif
00743       // must be an inline-block, inline-table, or any RenderReplaced
00744       bool rtl = ps->direction() == RTL;
00745       const QFontMetrics &pfm = ps->fontMetrics();
00746 
00747       if (coalesceOutsideBoxes) {
00748         if (sbp.equalsBox(box, true, false)) {
00749           sbp.it = lastCoalescedBox;
00750           Q_ASSERT(!sbp.found);
00751           sbp.found = true;
00752         }
00753       } else {
00754         addCreatedInlineBoxEdge(box, pfm, true, rtl);
00755         sbp.check(preEnd());
00756       }
00757 
00758       caret_boxes.append(new CaretBox(box, false, false));
00759       sbp.check(preEnd());
00760 
00761       addCreatedInlineBoxEdge(box, pfm, false, rtl);
00762       lastCoalescedBox = preEnd();
00763       sbp.check(lastCoalescedBox);
00764       coalesceOutsideBoxes = true;
00765     }/*end if*/
00766   }/*next box*/
00767 }
00768 #undef DEBUG_ACIB
00769 
00770 void CaretBoxLine::addCreatedFlowBoxInside(InlineFlowBox *flowBox, const QFontMetrics &fm) /*KDE_NO_EXPORT*/
00771 {
00772 
00773   CaretBox *caretBox = new CaretBox(flowBox, false, false);
00774   caret_boxes.append(caretBox);
00775 
00776   // afaik an inner flow box can only have the width 0, therefore we don't
00777   // have to care for rtl or alignment
00778   // ### can empty inline elements have a width? css 2 spec isn't verbose about it
00779 
00780   caretBox->_y += flowBox->baseline() - fm.ascent();
00781   caretBox->_h = fm.height();
00782 }
00783 
00784 void CaretBoxLine::addCreatedFlowBoxEdge(InlineFlowBox *flowBox, const QFontMetrics &fm, bool left, bool rtl) /*KDE_NO_EXPORT*/
00785 {
00786   CaretBox *caretBox = new CaretBox(flowBox, true, !left);
00787   caret_boxes.append(caretBox);
00788 
00789   if (left ^ rtl) caretBox->_x -= flowBox->paddingLeft() + flowBox->borderLeft() + 1;
00790   else caretBox->_x += caretBox->_w + flowBox->paddingRight() + flowBox->borderRight();
00791 
00792   caretBox->_y += flowBox->baseline() - fm.ascent();
00793   caretBox->_h = fm.height();
00794   caretBox->_w = 1;
00795 }
00796 
00797 void CaretBoxLine::addCreatedInlineBoxEdge(InlineBox *box, const QFontMetrics &fm, bool left, bool rtl) /*KDE_NO_EXPORT*/
00798 {
00799   CaretBox *caretBox = new CaretBox(box, true, !left);
00800   caret_boxes.append(caretBox);
00801 
00802   if (left ^ rtl) caretBox->_x--;
00803   else caretBox->_x += caretBox->_w;
00804 
00805   caretBox->_y += box->baseline() - fm.ascent();
00806   caretBox->_h = fm.height();
00807   caretBox->_w = 1;
00808 }
00809 
00810 CaretBoxLine *CaretBoxLine::constructCaretBoxLine(CaretBoxLineDeleter *deleter,
00811     InlineFlowBox *basicFlowBox, InlineBox *seekBox, bool seekOutside,
00812         bool seekOutsideEnd, CaretBoxIterator &iter, RenderObject *seekObject)
00813 //  KDE_NO_EXPORT
00814 {
00815   // Iterate all inline boxes within this inline flow box.
00816   // Caret boxes will be created for each
00817   // - outside begin of an inline flow box (except for the basic inline flow box)
00818   // - outside end of an inline flow box (except for the basic inline flow box)
00819   // - inside of an empty inline flow box
00820   // - outside begin of an inline box resembling a replaced element
00821   // - outside end of an inline box resembling a replaced element
00822   // - inline text box
00823   // - inline replaced box
00824 
00825   CaretBoxLine *result = new CaretBoxLine(basicFlowBox);
00826   deleter->append(result);
00827 
00828   SeekBoxParams sbp(seekBox, seekOutside, seekOutsideEnd, seekObject, iter);
00829 
00830   // iterate recursively, I'm too lazy to do it iteratively
00831   result->addConvertedInlineBox(basicFlowBox, sbp);
00832 
00833   if (!sbp.found) sbp.it = result->end();
00834 
00835   return result;
00836 }
00837 
00838 CaretBoxLine *CaretBoxLine::constructCaretBoxLine(CaretBoxLineDeleter *deleter,
00839     RenderBox *cb, bool outside, bool outsideEnd, CaretBoxIterator &iter) /*KDE_NO_EXPORT*/
00840 {
00841   int _x = cb->xPos();
00842   int _y = cb->yPos();
00843   int height;
00844   int width = 1;        // no override is indicated in boxes
00845 
00846   if (outside) {
00847 
00848     RenderStyle *s = cb->element() && cb->element()->parent()
00849             && cb->element()->parent()->renderer()
00850             ? cb->element()->parent()->renderer()->style()
00851             : cb->style();
00852     bool rtl = s->direction() == RTL;
00853 
00854     const QFontMetrics &fm = s->fontMetrics();
00855     height = fm.height();
00856 
00857     if (!outsideEnd) {
00858         _x--;
00859     } else {
00860         _x += cb->width();
00861     }
00862 
00863     int hl = fm.leading() / 2;
00864     int baseline = cb->baselinePosition(false);
00865     if (!cb->isReplaced() || cb->style()->display() == BLOCK) {
00866         if (!outsideEnd ^ rtl)
00867             _y -= fm.leading() / 2;
00868         else
00869             _y += kMax(cb->height() - fm.ascent() - hl, 0);
00870     } else {
00871         _y += baseline - fm.ascent() - hl;
00872     }
00873 
00874   } else {      // !outside
00875 
00876     RenderStyle *s = cb->style();
00877     const QFontMetrics &fm = s->fontMetrics();
00878     height = fm.height();
00879 
00880     _x += cb->borderLeft() + cb->paddingLeft();
00881     _y += cb->borderTop() + cb->paddingTop();
00882 
00883     // ### regard direction
00884     switch (s->textAlign()) {
00885       case LEFT:
00886       case TAAUTO:  // ### find out what this does
00887       case JUSTIFY:
00888         break;
00889       case CENTER:
00890       case KONQ_CENTER:
00891         _x += cb->contentWidth() / 2;
00892         break;
00893       case RIGHT:
00894         _x += cb->contentWidth();
00895         break;
00896     }/*end switch*/
00897   }/*end if*/
00898 
00899   CaretBoxLine *result = new CaretBoxLine;
00900   deleter->append(result);
00901   result->caret_boxes.append(new CaretBox(_x, _y, width, height, cb,
00902             outside, outsideEnd));
00903   iter = result->begin();
00904   return result;
00905 }
00906 
00907 #if DEBUG_CARETMODE > 0
00908 void CaretBoxLine::dump(QTextStream &ts, const QString &ind) const
00909 {
00910   ts << ind << "cbl: baseFlowBox@" << basefb << endl;
00911   QString ind2 = ind + "  ";
00912   for (size_t i = 0; i < caret_boxes.size(); i++) {
00913     if (i > 0) ts << endl;
00914     caret_boxes[i]->dump(ts, ind2);
00915   }
00916 }
00917 #endif
00918 
00919 // == caret mode related helper functions
00920 
00928 inline InlineFlowBox *seekBaseFlowBox(InlineBox *b, RenderObject *base = 0)
00929 {
00930   // Seek root line box or base inline flow box, if \c base is interfering.
00931   while (b->parent() && b->object() != base) {
00932     b = b->parent();
00933   }/*wend*/
00934   Q_ASSERT(b->isInlineFlowBox());
00935   return static_cast<InlineFlowBox *>(b);
00936 }
00937 
00940 inline bool isBlockRenderReplaced(RenderObject *r)
00941 {
00942   return r->isRenderReplaced() && r->style()->display() == BLOCK;
00943 }
00944 
00961 static CaretBoxLine* findCaretBoxLine(DOM::NodeImpl *node, long offset,
00962         CaretBoxLineDeleter *cblDeleter, RenderObject *base,
00963                 long &r_ofs, CaretBoxIterator &caretBoxIt)
00964 {
00965   bool outside, outsideEnd;
00966   RenderObject *r = findRenderer(node, offset, base, r_ofs, outside, outsideEnd);
00967   if (!r) { return 0; }
00968 #if DEBUG_CARETMODE > 0
00969   kdDebug(6200) << "=================== findCaretBoxLine" << endl;
00970   kdDebug(6200) << "node " << node << " offset: " << offset << " r " << r->renderName() << "[" << r << "].node " << r->element()->nodeName().string() << "[" << r->element() << "]" << " r_ofs " << r_ofs << " outside " << outside << " outsideEnd " << outsideEnd << endl;
00971 #endif
00972 
00973   // There are two strategies to find the correct line box. (The third is failsafe)
00974   // (A) First, if node's renderer is a RenderText, we only traverse its text
00975   // runs and return the root line box (saves much time for long blocks).
00976   // This should be the case 99% of the time.
00977   // (B) Second, we derive the inline flow box directly when the renderer is
00978   // a RenderBlock, RenderInline, or blocked RenderReplaced.
00979   // (C) Otherwise, we iterate linearly through all line boxes in order to find
00980   // the renderer.
00981 
00982   // (A)
00983   if (r->isText()) do {
00984     RenderText *t = static_cast<RenderText *>(r);
00985     int dummy;
00986     InlineBox *b = t->findInlineTextBox(offset, dummy, true);
00987     // Actually b should never be 0, but some render texts don't have text
00988     // boxes, so we insert the last run as an error correction.
00989     // If there is no last run, we resort to (B)
00990     if (!b) {
00991       if (t->m_lines.count() > 0)
00992         b = t->m_lines[t->m_lines.count() - 1];
00993       else
00994         break;
00995     }/*end if*/
00996     Q_ASSERT(b);
00997     outside = false;    // text boxes cannot have outside positions
00998     InlineFlowBox *baseFlowBox = seekBaseFlowBox(b, base);
00999 #if DEBUG_CARETMODE > 2
01000   kdDebug(6200) << "text-box b: " << b << " baseFlowBox: " << baseFlowBox << (b && b->object() ? QString(" contains \"%1\"").arg(QConstString(static_cast<RenderText *>(b->object())->str->s+b->minOffset(), kMin(b->maxOffset() - b->minOffset(), 15L)).string()) : QString::null) << endl;
01001 #endif
01002 #if 0
01003     if (t->containingBlock()->isListItem()) dumpLineBoxes(static_cast<RenderFlow *>(t->containingBlock()));
01004 #endif
01005 #if DEBUG_CARETMODE > 0
01006   kdDebug(6200) << "=================== end findCaretBoxLine (renderText)" << endl;
01007 #endif
01008     return CaretBoxLine::constructCaretBoxLine(cblDeleter, baseFlowBox,
01009         b, outside, outsideEnd, caretBoxIt);
01010   } while(false);/*end if*/
01011 
01012   // (B)
01013   bool isrepl = isBlockRenderReplaced(r);
01014   if (r->isRenderBlock() || r->isRenderInline() || isrepl) {
01015     RenderFlow *flow = static_cast<RenderFlow *>(r);
01016     InlineFlowBox *firstLineBox = isrepl ? 0 : flow->firstLineBox();
01017 
01018     // On render blocks, if we are outside, or have a totally empty render
01019     // block, we simply construct a special caret box line.
01020     // The latter case happens only when the render block is a leaf object itself.
01021     if (isrepl || r->isRenderBlock() && (outside || !firstLineBox)
01022             || r->isRenderInline() && !firstLineBox) {
01023   #if DEBUG_CARETMODE > 0
01024     kdDebug(6200) << "=================== end findCaretBoxLine (box " << (outside ? (outsideEnd ? "outside end" : "outside begin") : "inside") << ")" << endl;
01025   #endif
01026       Q_ASSERT(r->isBox());
01027       return CaretBoxLine::constructCaretBoxLine(cblDeleter,
01028             static_cast<RenderBox *>(r), outside, outsideEnd, caretBoxIt);
01029     }/*end if*/
01030 
01031   kdDebug(6200) << "firstlinebox " << firstLineBox << endl;
01032     InlineFlowBox *baseFlowBox = seekBaseFlowBox(firstLineBox, base);
01033     return CaretBoxLine::constructCaretBoxLine(cblDeleter, baseFlowBox,
01034         firstLineBox, outside, outsideEnd, caretBoxIt);
01035   }/*end if*/
01036 
01037   RenderBlock *cb = r->containingBlock();
01038   //if ( !cb ) return 0L;
01039   Q_ASSERT(cb);
01040 
01041   // ### which element doesn't have a block as its containing block?
01042   // Is it still possible after the RenderBlock/RenderInline merge?
01043   if (!cb->isRenderBlock()) {
01044     kdWarning() << "containing block is no render block!!! crash imminent" << endl;
01045   }/*end if*/
01046 
01047   InlineFlowBox *flowBox = cb->firstLineBox();
01048   // (C)
01049   // This case strikes when the element is replaced, but neither a
01050   // RenderBlock nor a RenderInline
01051   if (!flowBox) {   // ### utter emergency (why is this possible at all?)
01052 //    flowBox = generateDummyFlowBox(arena, cb, r);
01053 //    if (ibox) *ibox = flowBox->firstChild();
01054 //    outside = outside_end = true;
01055 
01056 //    kdWarning() << "containing block contains no inline flow boxes!!! crash imminent" << endl;
01057 #if DEBUG_CARETMODE > 0
01058    kdDebug(6200) << "=================== end findCaretBoxLine (2)" << endl;
01059 #endif
01060     return CaretBoxLine::constructCaretBoxLine(cblDeleter, cb,
01061             outside, outsideEnd, caretBoxIt);
01062   }/*end if*/
01063 
01064   // We iterate the inline flow boxes of the containing block until
01065   // we find the given node. This has one major flaw: it is linear, and therefore
01066   // painfully slow for really large blocks.
01067   for (; flowBox; flowBox = static_cast<InlineFlowBox *>(flowBox->nextLineBox())) {
01068 #if DEBUG_CARETMODE > 0
01069     kdDebug(6200) << "[scan line]" << endl;
01070 #endif
01071 
01072     // construct a caret line box and stop when the element is contained within
01073     InlineFlowBox *baseFlowBox = seekBaseFlowBox(flowBox, base);
01074     CaretBoxLine *cbl = CaretBoxLine::constructCaretBoxLine(cblDeleter,
01075         baseFlowBox, 0, outside, outsideEnd, caretBoxIt, r);
01076 #if DEBUG_CARETMODE > 5
01077     kdDebug(6200) << cbl->information() << endl;
01078 #endif
01079     if (caretBoxIt != cbl->end()) {
01080 #if DEBUG_CARETMODE > 0
01081    kdDebug(6200) << "=================== end findCaretBoxLine (3)" << endl;
01082 #endif
01083       return cbl;
01084     }
01085   }/*next flowBox*/
01086 
01087   // no inline flow box found, approximate to nearest following node.
01088   // Danger: this is O(n^2). It's only called to recover from
01089   // errors, that means, theoretically, never. (Practically, far too often :-( )
01090   Q_ASSERT(!flowBox);
01091   CaretBoxLine *cbl = findCaretBoxLine(nextLeafNode(node, base ? base->element() : 0), 0, cblDeleter, base, r_ofs, caretBoxIt);
01092 #if DEBUG_CARETMODE > 0
01093   kdDebug(6200) << "=================== end findCaretBoxLine" << endl;
01094 #endif
01095   return cbl;
01096 }
01097 
01104 static inline RenderTable *findTableUpTo(RenderObject *r, RenderFlow *cb)
01105 {
01106   while (r && r != cb && !r->isTable()) r = r->parent();
01107   return r && r->isTable() ? static_cast<RenderTable *>(r) : 0;
01108 }
01109 
01112 static inline bool isDescendant(RenderObject *r, RenderObject *cb)
01113 {
01114   while (r && r != cb) r = r->parent();
01115   return r;
01116 }
01117 
01128 static bool containsEditableElement(KHTMLPart *part, RenderBlock *cb,
01129     RenderTable *&table, bool fromEnd = false)
01130 {
01131   RenderObject *r = cb;
01132   if (fromEnd)
01133     while (r->lastChild()) r = r->lastChild();
01134   else
01135     while (r->firstChild()) r = r->firstChild();
01136 
01137   RenderTable *tempTable = 0;
01138   table = 0;
01139   bool withinCb;
01140 //  int state;      // not used
01141   ObjectTraversalState trav = InsideDescending;
01142   do {
01143     bool modWithinCb = withinCb = isDescendant(r, cb);
01144 
01145     // treat cb extra, it would not be considered otherwise
01146     if (!modWithinCb) {
01147       modWithinCb = true;
01148       r = cb;
01149     } else
01150       tempTable = findTableUpTo(r, cb);
01151 
01152 #if DEBUG_CARETMODE > 1
01153     kdDebug(6201) << "cee: r " << (r ? r->renderName() : QString::null) << "@" << r << " cb " << cb << " withinCb " << withinCb << " modWithinCb " << modWithinCb << " tempTable " << tempTable << endl;
01154 #endif
01155     if (r && modWithinCb && r->element() && !isUnsuitable(r, trav)
01156         && (part->isCaretMode() || part->isEditable()
01157         || r->style()->userInput() == UI_ENABLED)) {
01158       table = tempTable;
01159 #if DEBUG_CARETMODE > 1
01160     kdDebug(6201) << "cee: editable" << endl;
01161 #endif
01162       return true;
01163     }/*end if*/
01164 
01165 //    RenderObject *oldr = r;
01166 //    while (r && r == oldr)
01167 //      r = advanceSuitableObject(r, trav, fromEnd, cb->parent(), state);
01168     r = fromEnd ? r->objectAbove() : r->objectBelow();
01169   } while (r && withinCb);
01170   return false;
01171 }
01172 
01185 static bool containsEditableChildElement(KHTMLPart *part, RenderBlock *cb,
01186     RenderTable *&table, bool fromEnd, RenderObject *start)
01187 {
01188   int state = 0;
01189   ObjectTraversalState trav = OutsideAscending;
01190 // kdDebug(6201) << "start: " << start << endl;
01191   RenderObject *r = start;
01192   do {
01193     r = traverseRenderObjects(r, trav, fromEnd, cb->parent(), state);
01194   } while(r && !(state & AdvancedToSibling));
01195 // kdDebug(6201) << "r: " << r << endl;
01196   //advanceObject(start, trav, fromEnd, cb->parent(), state);
01197 //     RenderObject *oldr = r;
01198 //     while (r && r == oldr)
01199   if (!r) return false;
01200 
01201   if (fromEnd)
01202     while (r->firstChild()) r = r->firstChild();
01203   else
01204     while (r->lastChild()) r = r->lastChild();
01205 // kdDebug(6201) << "child r: " << r << endl;
01206   if (!r) return false;
01207 
01208   RenderTable *tempTable = 0;
01209   table = 0;
01210   bool withinCb = false;
01211   do {
01212 
01213     bool modWithinCb = withinCb = isDescendant(r, cb);
01214 
01215     // treat cb extra, it would not be considered otherwise
01216     if (!modWithinCb) {
01217       modWithinCb = true;
01218       r = cb;
01219     } else
01220       tempTable = findTableUpTo(r, cb);
01221 
01222 #if DEBUG_CARETMODE > 1
01223     kdDebug(6201) << "cece: r " << (r ? r->renderName() : QString::null) << "@" << r << " cb " << cb << " withinCb " << withinCb << " modWithinCb " << modWithinCb << " tempTable " << tempTable << endl;
01224 #endif
01225     if (r && withinCb && r->element() && !isUnsuitable(r, trav)
01226         && (part->isCaretMode() || part->isEditable()
01227         || r->style()->userInput() == UI_ENABLED)) {
01228       table = tempTable;
01229 #if DEBUG_CARETMODE > 1
01230     kdDebug(6201) << "cece: editable" << endl;
01231 #endif
01232       return true;
01233     }/*end if*/
01234 
01235     r = fromEnd ? r->objectAbove() : r->objectBelow();
01236   } while (withinCb);
01237   return false;
01238 }
01239 
01240 // == class LinearDocument implementation
01241 
01242 LinearDocument::LinearDocument(KHTMLPart *part, NodeImpl *node, long offset,
01243         CaretAdvancePolicy advancePolicy, ElementImpl *baseElem)
01244     : node(node), offset(offset), m_part(part),
01245     advPol(advancePolicy), base(0)
01246 {
01247   if (node == 0) return;
01248 
01249   if (baseElem) {
01250     RenderObject *b = baseElem->renderer();
01251     if (b && (b->isRenderBlock() || b->isRenderInline()))
01252       base = b;
01253   }
01254 
01255   initPreBeginIterator();
01256   initEndIterator();
01257 }
01258 
01259 LinearDocument::~LinearDocument()
01260 {
01261 }
01262 
01263 int LinearDocument::count() const
01264 {
01265   // FIXME: not implemented
01266   return 1;
01267 }
01268 
01269 LinearDocument::Iterator LinearDocument::current()
01270 {
01271   return LineIterator(this, node, offset);
01272 }
01273 
01274 LinearDocument::Iterator LinearDocument::begin()
01275 {
01276   NodeImpl *n = base ? base->element() : 0;
01277   if (!base) n = node ? node->getDocument() : 0;
01278   if (!n) return end();
01279 
01280   n = n->firstChild();
01281   if (advPol == LeafsOnly)
01282     while (n->firstChild()) n = n->firstChild();
01283 
01284   if (!n) return end();     // must be empty document or empty base element
01285   return LineIterator(this, n, n->minOffset());
01286 }
01287 
01288 LinearDocument::Iterator LinearDocument::preEnd()
01289 {
01290   NodeImpl *n = base ? base->element() : 0;
01291   if (!base) n = node ? node->getDocument() : 0;
01292   if (!n) return preBegin();
01293 
01294   n = n->lastChild();
01295   if (advPol == LeafsOnly)
01296     while (n->lastChild()) n = n->lastChild();
01297 
01298   if (!n) return preBegin();    // must be empty document or empty base element
01299   return LineIterator(this, n, n->maxOffset());
01300 }
01301 
01302 void LinearDocument::initPreBeginIterator()
01303 {
01304   _preBegin = LineIterator(this, 0, 0);
01305 }
01306 
01307 void LinearDocument::initEndIterator()
01308 {
01309   _end = LineIterator(this, 0, 1);
01310 }
01311 
01312 // == class LineIterator implementation
01313 
01314 CaretBoxIterator LineIterator::currentBox /*KDE_NO_EXPORT*/;
01315 long LineIterator::currentOffset /*KDE_NO_EXPORT*/;
01316 
01317 LineIterator::LineIterator(LinearDocument *l, DOM::NodeImpl *node, long offset)
01318         : lines(l)
01319 {
01320 //  kdDebug(6200) << "LineIterator: node " << node << " offset " << offset << endl;
01321   if (!node) { cbl = 0; return; }
01322   cbl = findCaretBoxLine(node, offset, &lines->cblDeleter,
01323         l->baseObject(), currentOffset, currentBox);
01324   // can happen on partially loaded documents
01325 #if DEBUG_CARETMODE > 0
01326   if (!cbl) kdDebug(6200) << "no render object found!" << endl;
01327 #endif
01328   if (!cbl) return;
01329 #if DEBUG_CARETMODE > 1
01330   kdDebug(6200) << "LineIterator: offset " << offset << " outside " << cbl->isOutside() << endl;
01331 #endif
01332 #if DEBUG_CARETMODE > 3
01333   kdDebug(6200) << cbl->information() << endl;
01334 #endif
01335   if (currentBox == cbl->end()) {
01336 #if DEBUG_CARETMODE > 0
01337     kdDebug(6200) << "LineIterator: findCaretBoxLine failed" << endl;
01338 #endif
01339     cbl = 0;
01340   }/*end if*/
01341 }
01342 
01343 void LineIterator::nextBlock()
01344 {
01345   RenderObject *base = lines->baseObject();
01346 
01347   bool cb_outside = cbl->isOutside();
01348   bool cb_outside_end = cbl->isOutsideEnd();
01349 
01350   {
01351     RenderObject *r = cbl->enclosingObject();
01352 
01353     ObjectTraversalState trav;
01354     int state;      // not used
01355     mapRenderPosToTraversalState(cb_outside, cb_outside_end, false, trav);
01356 #if DEBUG_CARETMODE > 1
01357     kdDebug(6200) << "nextBlock: before adv r" << r << " " << (r ? r->renderName() : QString::null) << (r && r->isText() ? " contains \"" + QString(((RenderText *)r)->str->s, QMIN(((RenderText *)r)->str->l,15)) + "\"" : QString::null) << " trav " << trav << " cb_outside " << cb_outside << " cb_outside_end " << cb_outside_end << endl;
01358 #endif
01359     r = advanceSuitableObject(r, trav, false, base, state);
01360     if (!r) {
01361       cbl = 0;
01362       return;
01363     }/*end if*/
01364 
01365     mapTraversalStateToRenderPos(trav, false, cb_outside, cb_outside_end);
01366 #if DEBUG_CARETMODE > 1
01367     kdDebug(6200) << "nextBlock: after r" << r << " trav " << trav << " cb_outside " << cb_outside << " cb_outside_end " << cb_outside_end << endl;
01368 #endif
01369 #if DEBUG_CARETMODE > 0
01370     kdDebug(6200) << "++: r " << r << "[" << (r?r->renderName():QString::null) << "]" << endl;
01371 #endif
01372 
01373     RenderBlock *cb;
01374 
01375     // If we hit a block or replaced object, use this as its enclosing object
01376     bool isrepl = isBlockRenderReplaced(r);
01377     if (r->isRenderBlock() || isrepl) {
01378       RenderBox *cb = static_cast<RenderBox *>(r);
01379 
01380       cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter, cb,
01381             cb_outside, cb_outside_end, currentBox);
01382 
01383 #if DEBUG_CARETMODE > 0
01384       kdDebug(6200) << "r->isFlow is cb. continuation @" << cb->continuation() << endl;
01385 #endif
01386       return;
01387     } else {
01388       cb = r->containingBlock();
01389       Q_ASSERT(cb->isRenderBlock());
01390     }/*end if*/
01391     InlineFlowBox *flowBox = cb->firstLineBox();
01392 #if DEBUG_CARETMODE > 0
01393     kdDebug(6200) << "++: flowBox " << flowBox << " cb " << cb << "[" << (cb?cb->renderName()+QString(".node ")+QString::number((unsigned)cb->element(),16)+(cb->element()?"@"+cb->element()->nodeName().string():QString::null):QString::null) << "]" << endl;
01394 #endif
01395     Q_ASSERT(flowBox);
01396     if (!flowBox) { // ### utter emergency (why is this possible at all?)
01397       cb_outside = cb_outside_end = true;
01398       cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter, cb,
01399             cb_outside, cb_outside_end, currentBox);
01400       return;
01401     }
01402 
01403     bool seekOutside = false, seekOutsideEnd = false; // silence gcc uninit warning
01404     CaretBoxIterator it;
01405     cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter,
01406     flowBox, flowBox->firstChild(), seekOutside, seekOutsideEnd, it);
01407   }
01408 }
01409 
01410 void LineIterator::prevBlock()
01411 {
01412   RenderObject *base = lines->baseObject();
01413 
01414   bool cb_outside = cbl->isOutside();
01415   bool cb_outside_end = cbl->isOutsideEnd();
01416 
01417   {
01418     RenderObject *r = cbl->enclosingObject();
01419     if (r->isAnonymous() && !cb_outside)
01420       cb_outside = true, cb_outside_end = false;
01421 
01422     ObjectTraversalState trav;
01423     int state;      // not used
01424     mapRenderPosToTraversalState(cb_outside, cb_outside_end, true, trav);
01425 #if DEBUG_CARETMODE > 1
01426     kdDebug(6200) << "prevBlock: before adv r" << r << " " << (r ? r->renderName() : QString::null) << (r && r->isText() ? " contains \"" + QString(((RenderText *)r)->str->s, QMIN(((RenderText *)r)->str->l,15)) + "\"" : QString::null) << " trav " << trav << " cb_outside " << cb_outside << " cb_outside_end " << cb_outside_end << endl;
01427 #endif
01428     r = advanceSuitableObject(r, trav, true, base, state);
01429     if (!r) {
01430       cbl = 0;
01431       return;
01432     }/*end if*/
01433 
01434     mapTraversalStateToRenderPos(trav, true, cb_outside, cb_outside_end);
01435 #if DEBUG_CARETMODE > 1
01436     kdDebug(6200) << "prevBlock: after r" << r << " trav " << trav << " cb_outside " << cb_outside << " cb_outside_end " << cb_outside_end << endl;
01437 #endif
01438 #if DEBUG_CARETMODE > 0
01439     kdDebug(6200) << "--: r " << r << "[" << (r?r->renderName():QString::null) << "]" << endl;
01440 #endif
01441 
01442     RenderBlock *cb;
01443 
01444     // If we hit a block, use this as its enclosing object
01445     bool isrepl = isBlockRenderReplaced(r);
01446 //    kdDebug(6200) << "isrepl " << isrepl << " isblock " << r->isRenderBlock() << endl;
01447     if (r->isRenderBlock() || isrepl) {
01448       RenderBox *cb = static_cast<RenderBox *>(r);
01449 
01450       cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter, cb,
01451             cb_outside, cb_outside_end, currentBox);
01452 
01453 #if DEBUG_CARETMODE > 0
01454       kdDebug(6200) << "r->isFlow is cb. continuation @" << cb->continuation() << endl;
01455 #endif
01456       return;
01457     } else {
01458       cb = r->containingBlock();
01459       Q_ASSERT(cb->isRenderBlock());
01460     }/*end if*/
01461     InlineFlowBox *flowBox = cb->lastLineBox();
01462 #if DEBUG_CARETMODE > 0
01463     kdDebug(6200) << "--: flowBox " << flowBox << " cb " << cb << "[" << (cb?cb->renderName()+QString(".node ")+QString::number((unsigned)cb->element(),16)+(cb->element()?"@"+cb->element()->nodeName().string():QString::null):QString::null) << "]" << endl;
01464 #endif
01465     Q_ASSERT(flowBox);
01466     if (!flowBox) { // ### utter emergency (why is this possible at all?)
01467       cb_outside = true; cb_outside_end = false;
01468       cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter, cb,
01469             cb_outside, cb_outside_end, currentBox);
01470       return;
01471     }
01472 
01473     bool seekOutside = false, seekOutsideEnd = false; // silence gcc uninit warning
01474     CaretBoxIterator it;
01475     cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter,
01476     flowBox, flowBox->firstChild(), seekOutside, seekOutsideEnd, it);
01477   }
01478 }
01479 
01480 void LineIterator::advance(bool toBegin)
01481 {
01482   InlineFlowBox *flowBox = cbl->baseFlowBox();
01483   if (flowBox) {
01484     flowBox = static_cast<InlineFlowBox *>(toBegin ? flowBox->prevLineBox() : flowBox->nextLineBox());
01485     if (flowBox) {
01486       bool seekOutside = false, seekOutsideEnd = false; // silence gcc uninit warning
01487       CaretBoxIterator it;
01488       cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter,
01489           flowBox, flowBox->firstChild(), seekOutside, seekOutsideEnd, it);
01490     }/*end if*/
01491   }/*end if*/
01492 
01493   // if there are no more lines in this block, move towards block to come
01494   if (!flowBox) { if (toBegin) prevBlock(); else nextBlock(); }
01495 
01496 #if DEBUG_CARETMODE > 3
01497   if (cbl) kdDebug(6200) << cbl->information() << endl;
01498 #endif
01499 }
01500 
01501 // == class EditableCaretBoxIterator implementation
01502 
01503 void EditableCaretBoxIterator::advance(bool toBegin)
01504 {
01505 #if DEBUG_CARETMODE > 3
01506       kdDebug(6200) << "---------------" << k_funcinfo << "toBegin " << toBegin << endl;
01507 #endif
01508   const CaretBoxIterator preBegin = cbl->preBegin();
01509   const CaretBoxIterator end = cbl->end();
01510 
01511   CaretBoxIterator lastbox = *this, curbox;
01512   bool islastuseable = true;    // silence gcc
01513   bool iscuruseable;
01514   // Assume adjacency of caret boxes. Will be falsified later if applicable.
01515   adjacent = true;
01516 
01517 #if DEBUG_CARETMODE > 4
01518 //       kdDebug(6200) << "ebit::advance: before: " << (**this)->object() << "@" << (**this)->object()->renderName() << ".node " << (**this)->object()->element() << "[" << ((**this)->object()->element() ? (**this)->object()->element()->nodeName().string() : QString::null) << "] inline " << (**this)->isInline() << " outside " << (**this)->isOutside() << " outsideEnd " << (**this)->isOutsideEnd() << endl;
01519 #endif
01520 
01521   if (toBegin) CaretBoxIterator::operator --(); else CaretBoxIterator::operator ++();
01522   bool curAtEnd = *this == preBegin || *this == end;
01523   curbox = *this;
01524   bool atEnd = true;
01525   if (!curAtEnd) {
01526     iscuruseable = isEditable(curbox, toBegin);
01527     if (toBegin) CaretBoxIterator::operator --(); else CaretBoxIterator::operator ++();
01528     atEnd = *this == preBegin || *this == end;
01529   }
01530   while (!curAtEnd) {
01531     bool haslast = lastbox != end && lastbox != preBegin;
01532     bool hascoming = !atEnd;
01533     bool iscominguseable = true; // silence gcc
01534 
01535     if (!atEnd) iscominguseable = isEditable(*this, toBegin);
01536     if (iscuruseable) {
01537 #if DEBUG_CARETMODE > 3
01538       kdDebug(6200) << "ebit::advance: " << (*curbox)->object() << "@" << (*curbox)->object()->renderName() << ".node " << (*curbox)->object()->element() << "[" << ((*curbox)->object()->element() ? (*curbox)->object()->element()->nodeName().string() : QString::null) << "] inline " << (*curbox)->isInline() << " outside " << (*curbox)->isOutside() << " outsideEnd " << (*curbox)->isOutsideEnd() << endl;
01539 #endif
01540 
01541       CaretBox *box = *curbox;
01542       if (box->isOutside()) {
01543         // if this caret box represents no inline box, it is an outside box
01544     // which has to be considered unconditionally
01545         if (!box->isInline()) break;
01546 
01547         if (advpol == VisibleFlows) break;
01548 
01549     // IndicatedFlows and LeafsOnly are treated equally in caret box lines
01550 
01551     InlineBox *ibox = box->inlineBox();
01552     // get previous inline box
01553     InlineBox *prev = box->isOutsideEnd() ? ibox : ibox->prevOnLine();
01554     // get next inline box
01555     InlineBox *next = box->isOutsideEnd() ? ibox->nextOnLine() : ibox;
01556 
01557     const bool isprevindicated = !prev || isIndicatedInlineBox(prev);
01558     const bool isnextindicated = !next || isIndicatedInlineBox(next);
01559     const bool last = haslast && !islastuseable;
01560     const bool coming = hascoming && !iscominguseable;
01561     const bool left = !prev || prev->isInlineFlowBox() && isprevindicated
01562         || (toBegin && coming || !toBegin && last);
01563     const bool right = !next || next->isInlineFlowBox() && isnextindicated
01564         || (!toBegin && coming || toBegin && last);
01565         const bool text2indicated = toBegin && next && next->isInlineTextBox()
01566                 && isprevindicated
01567             || !toBegin && prev && prev->isInlineTextBox() && isnextindicated;
01568         const bool indicated2text = !toBegin && next && next->isInlineTextBox()
01569                 && prev && isprevindicated
01570             // ### this code is so broken.
01571             /*|| toBegin && prev && prev->isInlineTextBox() && isnextindicated*/;
01572 #if DEBUG_CARETMODE > 5
01573       kdDebug(6200) << "prev " << prev << " haslast " << haslast << " islastuseable " << islastuseable << " left " << left << " next " << next << " hascoming " << hascoming << " iscominguseable " << iscominguseable << " right " << right << " text2indicated " << text2indicated << " indicated2text " << indicated2text << endl;
01574 #endif
01575 
01576     if (left && right && !text2indicated || indicated2text) {
01577       adjacent = false;
01578 #if DEBUG_CARETMODE > 4
01579       kdDebug(6200) << "left && right && !text2indicated || indicated2text" << endl;
01580 #endif
01581       break;
01582     }
01583 
01584       } else {
01585         // inside boxes are *always* valid
01586 #if DEBUG_CARETMODE > 4
01587 if (box->isInline()) {
01588         InlineBox *ibox = box->inlineBox();
01589       kdDebug(6200) << "inside " << (!ibox->isInlineFlowBox() || static_cast<InlineFlowBox *>(ibox)->firstChild() ? "non-empty" : "empty") << (isIndicatedInlineBox(ibox) ? " indicated" : "") << " adjacent=" << adjacent << endl;
01590     }
01591 #if 0
01592   RenderStyle *s = ibox->object()->style();
01593   kdDebug(6200) << "bordls " << s->borderLeftStyle()
01594         << " bordl " << (s->borderLeftStyle() != BNONE)
01595         << " bordr " << (s->borderRightStyle() != BNONE)
01596         << " bordt " << (s->borderTopStyle() != BNONE)
01597             << " bordb " << (s->borderBottomStyle() != BNONE)
01598         << " padl " << s->paddingLeft().value()
01599                 << " padr " << s->paddingRight().value()
01600             << " padt " << s->paddingTop().value()
01601                 << " padb " << s->paddingBottom().value()
01602     // ### Can inline elements have top/bottom margins? Couldn't find
01603     // it in the CSS 2 spec, but Mozilla ignores them, so we do, too.
01604         << " marl " << s->marginLeft().value()
01605                 << " marr " << s->marginRight().value()
01606             << endl;
01607 #endif
01608 #endif
01609         break;
01610       }/*end if*/
01611 
01612     } else {
01613 
01614       if (!(*curbox)->isOutside()) {
01615         // cannot be adjacent anymore
01616     adjacent = false;
01617       }
01618 
01619     }/*end if*/
01620     lastbox = curbox;
01621     islastuseable = iscuruseable;
01622     curbox = *this;
01623     iscuruseable = iscominguseable;
01624     curAtEnd = atEnd;
01625     if (!atEnd) {
01626       if (toBegin) CaretBoxIterator::operator --(); else CaretBoxIterator::operator ++();
01627       atEnd = *this == preBegin || *this == end;
01628     }/*end if*/
01629   }/*wend*/
01630 
01631   *static_cast<CaretBoxIterator *>(this) = curbox;
01632 #if DEBUG_CARETMODE > 4
01633 //  kdDebug(6200) << "still valid? " << (*this != preBegin && *this != end) << endl;
01634 #endif
01635 #if DEBUG_CARETMODE > 3
01636       kdDebug(6200) << "---------------" << k_funcinfo << "end " << endl;
01637 #endif
01638 }
01639 
01640 bool EditableCaretBoxIterator::isEditable(const CaretBoxIterator &boxit, bool fromEnd)
01641 {
01642   Q_ASSERT(boxit != cbl->end() && boxit != cbl->preBegin());
01643   CaretBox *b = *boxit;
01644   RenderObject *r = b->object();
01645 #if DEBUG_CARETMODE > 0
01646 //  if (b->isInlineFlowBox()) kdDebug(6200) << "b is inline flow box" << (outside ? " (outside)" : "") << endl;
01647   kdDebug(6200) << "isEditable r" << r << ": " << (r ? r->renderName() : QString::null) << (r && r->isText() ? " contains \"" + QString(((RenderText *)r)->str->s, QMIN(((RenderText *)r)->str->l,15)) + "\"" : QString::null) << endl;
01648 #endif
01649   // Must check caret mode or design mode *after* r->element(), otherwise
01650   // lines without a backing DOM node get regarded, leading to a crash.
01651   // ### check should actually be in InlineBoxIterator
01652   NodeImpl *node = r->element();
01653   ObjectTraversalState trav;
01654   mapRenderPosToTraversalState(b->isOutside(), b->isOutsideEnd(), fromEnd, trav);
01655   if (isUnsuitable(r, trav) || !node) {
01656     return false;
01657   }
01658 
01659   // generally exclude replaced elements with no children from navigation
01660   if (!b->isOutside() && r->isRenderReplaced() && !r->firstChild())
01661     return false;
01662 
01663   RenderObject *eff_r = r;
01664   bool globallyNavigable = m_part->isCaretMode() || m_part->isEditable();
01665 
01666   // calculate the parent element's editability if this inline box is outside.
01667   if (b->isOutside() && !globallyNavigable) {
01668     NodeImpl *par = node->parent();
01669     // I wonder whether par can be 0. It shouldn't be possible if the
01670     // algorithm contained no bugs.
01671     Q_ASSERT(par);
01672     if (par) node = par;
01673     eff_r = node->renderer();
01674     Q_ASSERT(eff_r);    // this is a hard requirement
01675   }
01676   
01677   bool result = globallyNavigable || eff_r->style()->userInput() == UI_ENABLED;
01678 #if DEBUG_CARETMODE > 0
01679   kdDebug(6200) << result << endl;
01680 #endif
01681   return result;
01682 }
01683 
01684 // == class EditableLineIterator implementation
01685 
01686 void EditableLineIterator::advance(bool toBegin)
01687 {
01688   CaretAdvancePolicy advpol = lines->advancePolicy();
01689   LineIterator lasteditable, lastindicated;
01690   bool haslasteditable = false;
01691   bool haslastindicated = false;
01692   bool uselasteditable = false;
01693 
01694   LineIterator::advance(toBegin);
01695   while (cbl) {
01696     if (isEditable(*this)) {
01697 #if DEBUG_CARETMODE > 3
01698       kdDebug(6200) << "advance: " << cbl->enclosingObject() << "@" << cbl->enclosingObject()->renderName() << ".node " << cbl->enclosingObject()->element() << "[" << (cbl->enclosingObject()->element() ? cbl->enclosingObject()->element()->nodeName().string() : QString::null) << "]" << endl;
01699 #endif
01700 
01701       bool hasindicated = isIndicatedFlow(cbl->enclosingObject());
01702       if (hasindicated) {
01703         haslastindicated = true;
01704         lastindicated = *this;
01705       }
01706 
01707       switch (advpol) {
01708         case IndicatedFlows:
01709           if (hasindicated) goto wend;
01710           // fall through
01711         case LeafsOnly:
01712           if (cbl->isOutside()) break;
01713           // fall through
01714         case VisibleFlows: goto wend;
01715       }/*end switch*/
01716 
01717       // remember rejected editable element
01718       lasteditable = *this;
01719       haslasteditable = true;
01720 #if DEBUG_CARETMODE > 4
01721       kdDebug(6200) << "remembered lasteditable " << *lasteditable << endl;
01722 #endif
01723     } else {
01724 
01725       // If this element isn't editable, but the last one was, and it was only
01726       // rejected because it didn't match the caret advance policy, force it.
01727       // Otherwise certain combinations of editable and uneditable elements
01728       // could never be reached with some policies.
01729       if (haslasteditable) { uselasteditable = true; break; }
01730 
01731     }
01732     LineIterator::advance(toBegin);
01733   }/*wend*/
01734 wend:
01735 
01736   if (uselasteditable) *this = haslastindicated ? lastindicated : lasteditable;
01737   if (!cbl && haslastindicated) *this = lastindicated;
01738 }
01739 
01740 // == class EditableCharacterIterator implementation
01741 
01742 void EditableCharacterIterator::initFirstChar()
01743 {
01744   CaretBox *box = *ebit;
01745   InlineBox *b = box->inlineBox();
01746   if (_offset == box->maxOffset())
01747     peekNext();
01748   else if (b && !box->isOutside() && b->isInlineTextBox())
01749     _char = static_cast<RenderText *>(b->object())->str->s[_offset].unicode();
01750   else
01751     _char = -1;
01752 }
01753 
01757 static inline bool isCaretBoxEmpty(CaretBox *box) {
01758   if (!box->isInline()) return false;
01759   InlineBox *ibox = box->inlineBox();
01760   return ibox->isInlineFlowBox()
01761         && !static_cast<InlineFlowBox *>(ibox)->firstChild()
01762             && !isIndicatedInlineBox(ibox);
01763 }
01764 
01765 EditableCharacterIterator &EditableCharacterIterator::operator ++()
01766 {
01767   _offset++;
01768 
01769   CaretBox *box = *ebit;
01770   InlineBox *b = box->inlineBox();
01771   long maxofs = box->maxOffset();
01772 #if DEBUG_CARETMODE > 0
01773   kdDebug(6200) << "box->maxOffset() " << box->maxOffset() << " box->minOffset() " << box->minOffset() << endl;
01774 #endif
01775   if (_offset == maxofs) {
01776 #if DEBUG_CARETMODE > 2
01777 kdDebug(6200) << "_offset == maxofs: " << _offset << " == " << maxofs << endl;
01778 #endif
01779     peekNext();
01780   } else if (_offset > maxofs) {
01781 #if DEBUG_CARETMODE > 2
01782 kdDebug(6200) << "_offset > maxofs: " << _offset << " > " << maxofs /*<< " _peekNext: " << _peekNext*/ << endl;
01783 #endif
01784     if (true) {
01785       ++ebit;
01786       if (ebit == (*_it)->end()) {  // end of line reached, go to next line
01787         ++_it;
01788 #if DEBUG_CARETMODE > 3
01789 kdDebug(6200) << "++_it" << endl;
01790 #endif
01791         if (_it != _it.lines->end()) {
01792       ebit = _it;
01793           box = *ebit;
01794           b = box->inlineBox();
01795 #if DEBUG_CARETMODE > 3
01796 kdDebug(6200) << "box " << box << " b " << b << " isText " << box->isInlineTextBox() << endl;
01797 #endif
01798 
01799 #if DEBUG_CARETMODE > 3
01800       RenderObject *_r = box->object();
01801 kdDebug(6200) << "_r " << _r << ":" << _r->element()->nodeName().string() << endl;
01802 #endif
01803       _offset = box->minOffset();
01804 #if DEBUG_CARETMODE > 3
01805 kdDebug(6200) << "_offset " << _offset << endl;
01806 #endif
01807     } else {
01808           b = 0;
01809       _end = true;
01810     }/*end if*/
01811         goto readchar;
01812       }/*end if*/
01813     }/*end if*/
01814 
01815     bool adjacent = ebit.isAdjacent();
01816 #if 0
01817     // Jump over element if this one is not a text node.
01818     if (adjacent && !(*ebit)->isInlineTextBox()) {
01819       EditableCaretBoxIterator copy = ebit;
01820       ++ebit;
01821       if (ebit != (*_it)->end() && (*ebit)->isInlineTextBox()
01822           /*&& (!(*ebit)->isInlineFlowBox()
01823               || static_cast<InlineFlowBox *>(*ebit)->)*/)
01824         adjacent = false;
01825       else ebit = copy;
01826     }/*end if*/
01827 #endif
01828     // Jump over empty elements.
01829     if (adjacent && !(*ebit)->isInlineTextBox()) {
01830       bool noemptybox = true;
01831       while (isCaretBoxEmpty(*ebit)) {
01832         noemptybox = false;
01833         EditableCaretBoxIterator copy = ebit;
01834         ++ebit;
01835         if (ebit == (*_it)->end()) { ebit = copy; break; }
01836       }
01837       if (noemptybox) adjacent = false;
01838     }/*end if*/
01839 //     _r = (*ebit)->object();
01840     /*if (!_it.outside) */_offset = (*ebit)->minOffset() + adjacent;
01841     //_peekNext = 0;
01842     box = *ebit;
01843     b = box->inlineBox();
01844     goto readchar;
01845   } else {
01846 readchar:
01847     // get character
01848     if (b && !box->isOutside() && b->isInlineTextBox() && _offset < b->maxOffset())
01849       _char = static_cast<RenderText *>(b->object())->str->s[_offset].unicode();
01850     else
01851       _char = -1;
01852   }/*end if*/
01853 #if DEBUG_CARETMODE > 2
01854 kdDebug(6200) << "_offset: " << _offset /*<< " _peekNext: " << _peekNext*/ << " char '" << (char)_char << "'" << endl;
01855 #endif
01856 
01857 #if DEBUG_CARETMODE > 0
01858   if (!_end && ebit != (*_it)->end()) {
01859     CaretBox *box = *ebit;
01860     RenderObject *_r = box->object();
01861     kdDebug(6200) << "echit++(1): box " << box << (box && box->isInlineTextBox() ? QString(" contains \"%1\"").arg(QConstString(static_cast<RenderText *>(box->object())->str->s+box->minOffset(), box->maxOffset() - box->minOffset()).string()) : QString::null) << " _r " << (_r ? _r->element()->nodeName().string() : QString("<nil>")) << endl;
01862   }
01863 #endif
01864   return *this;
01865 }
01866 
01867 EditableCharacterIterator &EditableCharacterIterator::operator --()
01868 {
01869   _offset--;
01870   //kdDebug(6200) << "--: _offset=" << _offset << endl;
01871 
01872   CaretBox *box = *ebit;
01873   CaretBox *_peekPrev = 0;
01874   CaretBox *_peekNext = 0;
01875   InlineBox *b = box->inlineBox();
01876   long minofs = box->minOffset();
01877 #if DEBUG_CARETMODE > 0
01878   kdDebug(6200) << "box->maxOffset() " << box->maxOffset() << " box->minOffset() " << box->minOffset() << endl;
01879 #endif
01880   if (_offset == minofs) {
01881 #if DEBUG_CARETMODE > 2
01882 kdDebug(6200) << "_offset == minofs: " << _offset << " == " << minofs << endl;
01883 #endif
01884 //     _peekNext = b;
01885     // get character
01886     if (b && !box->isOutside() && b->isInlineTextBox())
01887       _char = static_cast<RenderText *>(b->object())->text()[_offset].unicode();
01888     else
01889       _char = -1;
01890 
01891     //peekPrev();
01892     bool do_prev = false;
01893     {
01894       EditableCaretBoxIterator copy;
01895       _peekPrev = 0;
01896       do {
01897         copy = ebit;
01898         --ebit;
01899         if (ebit == (*_it)->preBegin()) { ebit = copy; break; }
01900       } while (isCaretBoxEmpty(*ebit));
01901       // Jump to end of previous element if it's adjacent, and a text box
01902       if (ebit.isAdjacent() && ebit != (*_it)->preBegin() && (*ebit)->isInlineTextBox()) {
01903         _peekPrev = *ebit;
01904     do_prev = true;
01905       } else
01906         ebit = copy;
01907     }
01908     if (do_prev) goto prev;
01909   } else if (_offset < minofs) {
01910 prev:
01911 #if DEBUG_CARETMODE > 2
01912 kdDebug(6200) << "_offset < minofs: " << _offset << " < " << minofs /*<< " _peekNext: " << _peekNext*/ << endl;
01913 #endif
01914     if (!_peekPrev) {
01915       _peekNext = *ebit;
01916       --ebit;
01917       if (ebit == (*_it)->preBegin()) { // end of line reached, go to previous line
01918         --_it;
01919 #if DEBUG_CARETMODE > 3
01920 kdDebug(6200) << "--_it" << endl;
01921 #endif
01922         if (_it != _it.lines->preBegin()) {
01923 //    kdDebug(6200) << "begin from end!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" << endl;
01924       ebit = EditableCaretBoxIterator(_it, true);
01925           box = *ebit;
01926 //    RenderObject *r = box->object();
01927 #if DEBUG_CARETMODE > 3
01928 kdDebug(6200) << "box " << box << " b " << box->inlineBox() << " isText " << box->isInlineTextBox() << endl;
01929 #endif
01930           _offset = box->maxOffset();
01931 //    if (!_it.outside) _offset = r->isBR() ? (*ebit)->minOffset() : (*ebit)->maxOffset();
01932       _char = -1;
01933 #if DEBUG_CARETMODE > 0
01934           kdDebug(6200) << "echit--(2): box " << box << " b " << box->inlineBox() << (box->isInlineTextBox() ? QString(" contains \"%1\"").arg(QConstString(static_cast<RenderText *>(box->object())->str->s+box->minOffset(), box->maxOffset() - box->minOffset()).string()) : QString::null) << endl;
01935 #endif
01936     } else
01937       _end = true;
01938     return *this;
01939       }/*end if*/
01940     }/*end if*/
01941 
01942 #if 0
01943     bool adjacent = ebit.isAdjacent();
01944 #endif
01945 
01946 #if DEBUG_CARETMODE > 0
01947     kdDebug(6200) << "adjacent " << adjacent << " _peekNext " << _peekNext << " _peekNext->isInlineTextBox: " << (_peekNext ? _peekNext->isInlineTextBox() : false) << " !((*ebit)->isInlineTextBox): " << (*ebit ? !(*ebit)->isInlineTextBox() : true) << endl;
01948 #endif
01949 #if 0
01950     // Ignore this box if it isn't a text box, but the previous box was
01951     if (adjacent && _peekNext && _peekNext->isInlineTextBox()
01952         && !(*ebit)->isInlineTextBox()) {
01953       EditableCaretBoxIterator copy = ebit;
01954       --ebit;
01955       if (ebit == (*_it)->preBegin()) /*adjacent = false;
01956       else */ebit = copy;
01957     }/*end if*/
01958 #endif
01959 #if 0
01960     // Jump over empty elements.
01961     if (adjacent //&& _peekNext && _peekNext->isInlineTextBox()
01962         && !(*ebit)->isInlineTextBox()) {
01963       bool noemptybox = true;
01964       while (isCaretBoxEmpty(*ebit)) {
01965         noemptybox = false;
01966         EditableCaretBoxIterator copy = ebit;
01967         --ebit;
01968         if (ebit == (*_it)->preBegin()) { ebit = copy; break; }
01969         else _peekNext = *copy;
01970       }
01971       if (noemptybox) adjacent = false;
01972     }/*end if*/
01973 #endif
01974 #if DEBUG_CARETMODE > 0
01975     kdDebug(6200) << "(*ebit)->obj " << (*ebit)->object()->renderName() << "[" << (*ebit)->object() << "]" << " minOffset: " << (*ebit)->minOffset() << " maxOffset: " << (*ebit)->maxOffset() << endl;
01976 #endif
01977 #if DEBUG_CARETMODE > 3
01978     RenderObject *_r = (*ebit)->object();
01979 kdDebug(6200) << "_r " << _r << ":" << _r->element()->nodeName().string() << endl;
01980 #endif
01981     _offset = (*ebit)->maxOffset();
01982 //     if (!_it.outside) _offset = (*ebit)->maxOffset()/* - adjacent*/;
01983 #if DEBUG_CARETMODE > 3
01984 kdDebug(6200) << "_offset " << _offset << endl;
01985 #endif
01986     _peekPrev = 0;
01987   } else {
01988 #if DEBUG_CARETMODE > 0
01989 kdDebug(6200) << "_offset: " << _offset << " _peekNext: " << _peekNext << endl;
01990 #endif
01991     // get character
01992     if (_peekNext && _offset >= box->maxOffset() && _peekNext->isInlineTextBox())
01993       _char = static_cast<RenderText *>(_peekNext->object())->text()[_peekNext->minOffset()].unicode();
01994     else if (b && _offset < b->maxOffset() && b->isInlineTextBox())
01995       _char = static_cast<RenderText *>(b->object())->text()[_offset].unicode();
01996     else
01997       _char = -1;
01998   }/*end if*/
01999 
02000 #if DEBUG_CARETMODE > 0
02001   if (!_end && ebit != (*_it)->preBegin()) {
02002     CaretBox *box = *ebit;
02003     kdDebug(6200) << "echit--(1): box " << box << " b " << box->inlineBox() << (box->isInlineTextBox() ? QString(" contains \"%1\"").arg(QConstString(static_cast<RenderText *>(box->object())->str->s+box->minOffset(), box->maxOffset() - box->minOffset()).string()) : QString::null) << endl;
02004   }
02005 #endif
02006   return *this;
02007 }
02008 
02009 // == class TableRowIterator implementation
02010 
02011 TableRowIterator::TableRowIterator(RenderTable *table, bool fromEnd,
02012         RenderTableSection::RowStruct *row)
02013         : sec(table, fromEnd)
02014 {
02015   // set index
02016   if (*sec) {
02017     if (fromEnd) index = (*sec)->grid.size() - 1;
02018     else index = 0;
02019   }/*end if*/
02020 
02021   // initialize with given row
02022   if (row && *sec) {
02023     while (operator *() != row)
02024       if (fromEnd) operator --(); else operator ++();
02025   }/*end if*/
02026 }
02027 
02028 TableRowIterator &TableRowIterator::operator ++()
02029 {
02030   index++;
02031 
02032   if (index >= (int)(*sec)->grid.size()) {
02033     ++sec;
02034 
02035     if (*sec) index = 0;
02036   }/*end if*/
02037   return *this;
02038 }
02039 
02040 TableRowIterator &TableRowIterator::operator --()
02041 {
02042   index--;
02043 
02044   if (index < 0) {
02045     --sec;
02046 
02047     if (*sec) index = (*sec)->grid.size() - 1;
02048   }/*end if*/
02049   return *this;
02050 }
02051 
02052 // == class ErgonomicEditableLineIterator implementation
02053 
02054 // some decls
02055 static RenderTableCell *findNearestTableCellInRow(KHTMLPart *part, int x,
02056         RenderTableSection::RowStruct *row, bool fromEnd);
02057 
02071 static inline RenderTableCell *findNearestTableCell(KHTMLPart *part, int x,
02072         TableRowIterator &it, bool fromEnd)
02073 {
02074   RenderTableCell *result = 0;
02075 
02076   while (*it) {
02077     result = findNearestTableCellInRow(part, x, *it, fromEnd);
02078     if (result) break;
02079 
02080     if (fromEnd) --it; else ++it;
02081   }/*wend*/
02082 
02083   return result;
02084 }
02085 
02099 static RenderTableCell *findNearestTableCellInRow(KHTMLPart *part, int x,
02100         RenderTableSection::RowStruct *row, bool fromEnd)
02101 {
02102   // First pass. Find spatially nearest cell.
02103   int n = (int)row->row->size();
02104   int i;
02105   for (i = 0; i < n; i++) {
02106     RenderTableCell *cell = row->row->at(i);
02107     if (!cell || (int)cell == -1) continue;
02108 
02109     int absx, absy;
02110     cell->absolutePosition(absx, absy, false); // ### position: fixed?
02111 #if DEBUG_CARETMODE > 1
02112     kdDebug(6201) << "i/n " << i << "/" << n << " absx " << absx << " absy " << absy << endl;
02113 #endif
02114 
02115     // I rely on the assumption that all cells are in ascending visual order
02116     // ### maybe this assumption is wrong for bidi?
02117 #if DEBUG_CARETMODE > 1
02118     kdDebug(6201) << "x " << x << " < " << (absx + cell->width()) << "?" << endl;
02119 #endif
02120     if (x < absx + cell->width()) break;
02121   }/*next i*/
02122   if (i >= n) i = n - 1;
02123 
02124   // Second pass. Find editable cell, beginning with the currently found,
02125   // extending to the left, and to the right, alternating.
02126   for (int cnt = 0; cnt < 2*n; cnt++) {
02127     int index = i - ((cnt >> 1) + 1)*(cnt & 1) + (cnt >> 1)*!(cnt & 1);
02128     if (index < 0 || index >= n) continue;
02129 
02130     RenderTableCell *cell = row->row->at(index);
02131     if (!cell || (int)cell == -1) continue;
02132 
02133 #if DEBUG_CARETMODE > 1
02134     kdDebug(6201) << "index " << index << " cell " << cell << endl;
02135 #endif
02136     RenderTable *nestedTable;
02137     if (containsEditableElement(part, cell, nestedTable, fromEnd)) {
02138 
02139       if (nestedTable) {
02140         TableRowIterator it(nestedTable, fromEnd);
02141     while (*it) {
02142 // kdDebug(6201) << "=== recursive invocation" << endl;
02143           cell = findNearestTableCell(part, x, it, fromEnd);
02144       if (cell) break;
02145       if (fromEnd) --it; else ++it;
02146     }/*wend*/
02147       }/*end if*/
02148 
02149       return cell;
02150     }/*end if*/
02151   }/*next i*/
02152   return 0;
02153 }
02154 
02161 static RenderObject *commonAncestorTableSectionOrCell(RenderObject *r1,
02162         RenderObject *r2)
02163 {
02164   if (!r1 || !r2) return 0;
02165   RenderTableSection *sec = 0;
02166   int start_depth=0, end_depth=0;
02167   // First we find the depths of the two objects in the tree (start_depth, end_depth)
02168   RenderObject *n = r1;
02169   while (n->parent()) {
02170     n = n->parent();
02171     start_depth++;
02172   }/*wend*/
02173   n = r2;
02174   while( n->parent()) {
02175     n = n->parent();
02176     end_depth++;
02177   }/*wend*/
02178   // here we climb up the tree with the deeper object, until both objects have equal depth
02179   while (end_depth > start_depth) {
02180     r2 = r2->parent();
02181     end_depth--;
02182   }/*wend*/
02183   while (start_depth > end_depth) {
02184     r1 = r1->parent();
02185 //    if (r1->isTableSection()) sec = static_cast<RenderTableSection *>(r1);
02186     start_depth--;
02187   }/*wend*/
02188   // Climb the tree with both r1 and r2 until they are the same
02189   while (r1 != r2){
02190     r1 = r1->parent();
02191     if (r1->isTableSection()) sec = static_cast<RenderTableSection *>(r1);
02192     r2 = r2->parent();
02193   }/*wend*/
02194 
02195   // At this point, we found the most approximate common ancestor. Now climb
02196   // up until the condition of the function return value is satisfied.
02197   while (r1 && !r1->isTableCell() && !r1->isTableSection() && !r1->isTable())
02198     r1 = r1->parent();
02199 
02200   return r1 && r1->isTable() ? sec : r1;
02201 }
02202 
02210 static int findRowInSection(RenderTableSection *section, RenderTableCell *cell,
02211         RenderTableSection::RowStruct *&row, RenderTableCell *&directCell)
02212 {
02213   // Seek direct cell
02214   RenderObject *r = cell;
02215   while (r != section) {
02216     if (r->isTableCell()) directCell = static_cast<RenderTableCell *>(r);
02217     r = r->parent();
02218   }/*wend*/
02219 
02220   // So, and this is really nasty: As we have no indices, we have to do a
02221   // linear comparison. Oh, that sucks so much for long tables, you can't
02222   // imagine.
02223   int n = section->numRows();
02224   for (int i = 0; i < n; i++) {
02225     row = &section->grid[i];
02226 
02227     // check for cell
02228     int m = row->row->size();
02229     for (int j = 0; j < m; j++) {
02230       RenderTableCell *c = row->row->at(j);
02231       if (c == directCell) return i;
02232     }/*next j*/
02233 
02234   }/*next i*/
02235   Q_ASSERT(false);
02236   return -1;
02237 }
02238 
02244 static inline RenderTable *findFirstDescendantTable(RenderObject *leaf, RenderBlock *block)
02245 {
02246   RenderTable *result = 0;
02247   while (leaf && leaf != block) {
02248     if (leaf->isTable()) result = static_cast<RenderTable *>(leaf);
02249     leaf = leaf->parent();
02250   }/*wend*/
02251   return result;
02252 }
02253 
02257 static inline RenderTableCell *containingTableCell(RenderObject *r)
02258 {
02259   while (r && !r->isTableCell()) r = r->parent();
02260   return static_cast<RenderTableCell *>(r);
02261 }
02262 
02263 inline void ErgonomicEditableLineIterator::calcAndStoreNewLine(
02264             RenderBlock *newBlock, bool toBegin)
02265 {
02266   // take the first/last editable element in the found cell as the new
02267   // value for the iterator
02268   CaretBoxIterator it;
02269   cbl = CaretBoxLine::constructCaretBoxLine(&lines->cblDeleter,
02270     newBlock, true, toBegin, it);
02271 #if DEBUG_CARETMODE > 3
02272   kdDebug(6201) << cbl->information() << endl;
02273 #endif
02274 //  if (toBegin) prevBlock(); else nextBlock();
02275 
02276   if (!cbl) {
02277     return;
02278   }/*end if*/
02279 
02280   EditableLineIterator::advance(toBegin);
02281 }
02282 
02283 void ErgonomicEditableLineIterator::determineTopologicalElement(
02284         RenderTableCell *oldCell, RenderObject *newObject, bool toBegin)
02285 {
02286   // When we arrive here, a transition between cells has happened.
02287   // Now determine the type of the transition. This can be
02288   // (1) a transition from this cell into a table inside this cell.
02289   // (2) a transition from this cell into another cell of this table
02290 
02291   TableRowIterator it;
02292 
02293   RenderObject *commonAncestor = commonAncestorTableSectionOrCell(oldCell, newObject);
02294 #if DEBUG_CARETMODE > 1
02295   kdDebug(6201) << " ancestor " << commonAncestor << endl;
02296 #endif
02297 
02298   // The whole document is treated as a table cell.
02299   if (!commonAncestor || commonAncestor->isTableCell()) {   // (1)
02300 
02301     RenderTableCell *cell = static_cast<RenderTableCell *>(commonAncestor);
02302     RenderTable *table = findFirstDescendantTable(newObject, cell);
02303 
02304 #if DEBUG_CARETMODE > 0
02305     kdDebug(6201) << "table cell: " << cell << endl;
02306 #endif
02307 
02308     // if there is no table, we fell out of the previous table, and are now
02309     // in some table-less block. Therefore, done.
02310     if (!table) return;
02311 
02312     it = TableRowIterator(table, toBegin);
02313 
02314   } else if (commonAncestor->isTableSection()) {        // (2)
02315 
02316     RenderTableSection *section = static_cast<RenderTableSection *>(commonAncestor);
02317     RenderTableSection::RowStruct *row;
02318     int idx = findRowInSection(section, oldCell, row, oldCell);
02319 #if DEBUG_CARETMODE > 1
02320     kdDebug(6201) << "table section: row idx " << idx << endl;
02321 #endif
02322 
02323     it = TableRowIterator(section, idx);
02324 
02325     // advance rowspan rows
02326     int rowspan = oldCell->rowSpan();
02327     while (*it && rowspan--) {
02328       if (toBegin) --it; else ++it;
02329     }/*wend*/
02330 
02331   } else {
02332     kdError(6201) << "Neither common cell nor section! " << commonAncestor->renderName() << endl;
02333     // will crash on uninitialized table row iterator
02334   }/*end if*/
02335 
02336   RenderTableCell *cell = findNearestTableCell(lines->m_part, xCoor, it, toBegin);
02337 #if DEBUG_CARETMODE > 1
02338   kdDebug(6201) << "findNearestTableCell result: " << cell << endl;
02339 #endif
02340 
02341   RenderBlock *newBlock = cell;
02342   if (!cell) {
02343     Q_ASSERT(commonAncestor->isTableSection());
02344     RenderTableSection *section = static_cast<RenderTableSection *>(commonAncestor);
02345     cell = containingTableCell(section);
02346 #if DEBUG_CARETMODE > 1
02347     kdDebug(6201) << "containing cell: " << cell << endl;
02348 #endif
02349 
02350     RenderTable *nestedTable;
02351     bool editableChild = cell && containsEditableChildElement(lines->m_part,
02352             cell, nestedTable, toBegin, section->table());
02353 
02354     if (cell && !editableChild) {
02355 #if DEBUG_CARETMODE > 1
02356       kdDebug(6201) << "========= recursive invocation outer =========" << endl;
02357 #endif
02358       determineTopologicalElement(cell, cell->section(), toBegin);
02359 #if DEBUG_CARETMODE > 1
02360       kdDebug(6201) << "========= end recursive invocation outer =========" << endl;
02361 #endif
02362       return;
02363 
02364     } else if (cell && nestedTable) {
02365 #if DEBUG_CARETMODE > 1
02366       kdDebug(6201) << "========= recursive invocation inner =========" << endl;
02367 #endif
02368       determineTopologicalElement(cell, nestedTable, toBegin);
02369 #if DEBUG_CARETMODE > 1
02370       kdDebug(6201) << "========= end recursive invocation inner =========" << endl;
02371 #endif
02372       return;
02373 
02374     } else {
02375 #if DEBUG_CARETMODE > 1
02376       kdDebug(6201) << "newBlock is table: " << section->table() << endl;
02377 #endif
02378       RenderObject *r = section->table();
02379       int state;        // not used
02380       ObjectTraversalState trav = OutsideAscending;
02381       r = advanceSuitableObject(r, trav, toBegin, lines->baseObject(), state);
02382       if (!r) { cbl = 0;  return; }
02383 //      if (toBegin) prevBlock(); else nextBlock();
02384       newBlock = static_cast<RenderBlock *>(!r || r->isRenderBlock() ? r : r->containingBlock());
02385     }/*end if*/
02386 #if 0
02387   } else {
02388     // adapt cell so that prevBlock/nextBlock works as expected
02389     newBlock = cell;
02390     // on forward advancing, we must start from the outside end of the
02391     // previous object
02392     if (!toBegin) {
02393       RenderObject *r = newBlock;
02394       int state;        // not used
02395       ObjectTraversalState trav = OutsideAscending;
02396       r = advanceSuitableObject(r, trav, true, lines->advancePolicy(), lines->baseObject(), state);
02397       newBlock = static_cast<RenderBlock *>(!r || r->isRenderBlock() ? r : r->containingBlock());
02398     }/*end if*/
02399 #endif
02400   }/*end if*/
02401 
02402   calcAndStoreNewLine(newBlock, toBegin);
02403 }
02404 
02405 ErgonomicEditableLineIterator &ErgonomicEditableLineIterator::operator ++()
02406 {
02407   RenderTableCell *oldCell = containingTableCell(cbl->enclosingObject());
02408 
02409   EditableLineIterator::operator ++();
02410   if (*this == lines->end() || *this == lines->preBegin()) return *this;
02411 
02412   RenderTableCell *newCell = containingTableCell(cbl->enclosingObject());
02413 
02414   if (!newCell || newCell == oldCell) return *this;
02415 
02416   determineTopologicalElement(oldCell, newCell, false);
02417 
02418   return *this;
02419 }
02420 
02421 ErgonomicEditableLineIterator &ErgonomicEditableLineIterator::operator --()
02422 {
02423   RenderTableCell *oldCell = containingTableCell(cbl->enclosingObject());
02424 
02425   EditableLineIterator::operator --();
02426   if (*this == lines->end() || *this == lines->preBegin()) return *this;
02427 
02428   RenderTableCell *newCell = containingTableCell(cbl->enclosingObject());
02429 
02430   if (!newCell || newCell == oldCell) return *this;
02431 
02432   determineTopologicalElement(oldCell, newCell, true);
02433 
02434   return *this;
02435 }
02436 
02437 // == Navigational helper functions ==
02438 
02448 static CaretBox *nearestCaretBox(LineIterator &it, CaretViewContext *cv,
02449     int &x, int &absx, int &absy)
02450 {
02451   // Find containing block
02452   RenderObject *cb = (*it)->containingBlock();
02453 #if DEBUG_CARETMODE > 4
02454   kdDebug(6200) << "nearestCB: cb " << cb << "@" << (cb ? cb->renderName() : "") << endl;
02455 #endif
02456 
02457   if (cb) cb->absolutePosition(absx, absy);
02458   else absx = absy = 0;
02459 
02460   // Otherwise find out in which inline box the caret is to be placed.
02461 
02462   // this horizontal position is to be approximated
02463   x = cv->origX - absx;
02464   CaretBox *caretBox = 0; // Inline box containing the caret
02465 //  NodeImpl *lastnode = 0;  // node of previously checked render object.
02466   int xPos;        // x-coordinate of current inline box
02467   int oldXPos = -1;    // x-coordinate of last inline box
02468   EditableCaretBoxIterator fbit = it;
02469 #if DEBUG_CARETMODE > 0
02470 /*  if (it.linearDocument()->advancePolicy() != LeafsOnly)
02471     kdWarning() << "nearestInlineBox is only prepared to handle the LeafsOnly advance policy" << endl;*/
02472 //   kdDebug(6200) << "*fbit = " << *fbit << endl;
02473 #endif
02474   // Iterate through all children
02475   for (CaretBox *b; fbit != (*it)->end(); ++fbit) {
02476     b = *fbit;
02477 
02478 #if DEBUG_CARETMODE > 0
02479 //    RenderObject *r = b->object();
02480 //  if (b->isInlineFlowBox()) kdDebug(6200) << "b is inline flow box" << endl;
02481 //  kdDebug(6200) << "approximate r" << r << ": " << (r ? r->renderName() : QString::null) << (r && r->isText() ? " contains \"" + QString(((RenderText *)r)->str->s, ((RenderText *)r)->str->l) + "\"" : QString::null) << endl;
02482 #endif
02483     xPos = b->xPos();
02484 
02485     // the caret is before this box
02486     if (x < xPos) {
02487       // snap to nearest box
02488       if (oldXPos < 0 || x - (oldXPos + caretBox->width()) > xPos - x) {
02489     caretBox = b;   // current box is nearer
02490       }/*end if*/
02491       break;        // Otherwise, preceding box is implicitly used
02492     }
02493 
02494     caretBox = b;
02495 
02496     // the caret is within this box
02497     if (x >= xPos && x < xPos + caretBox->width())
02498       break;
02499     oldXPos = xPos;
02500 
02501     // the caret can only be after the last box which is automatically
02502     // contained in caretBox when we fall out of the loop.
02503   }/*next fbit*/
02504 
02505   return caretBox;
02506 }
02507 
02513 static void moveItToNextWord(EditableCharacterIterator &it)
02514 {
02515 #if DEBUG_CARETMODE > 0
02516   kdDebug(6200) << "%%%%%%%%%%%%%%%%%%%%% moveItToNextWord" << endl;
02517 #endif
02518   EditableCharacterIterator copy;
02519   while (!it.isEnd() && !(*it).isSpace() && !(*it).isPunct()) {
02520 #if DEBUG_CARETMODE > 2
02521     kdDebug(6200) << "reading1 '" << (*it).latin1() << "'" << endl;
02522 #endif
02523     copy = it;
02524     ++it;
02525   }
02526 
02527   if (it.isEnd()) {
02528     it = copy;
02529     return;
02530   }/*end if*/
02531 
02532   while (!it.isEnd() && ((*it).isSpace() || (*it).isPunct())) {
02533 #if DEBUG_CARETMODE > 2
02534     kdDebug(6200) << "reading2 '" << (*it).latin1() << "'" << endl;
02535 #endif
02536     copy = it;
02537     ++it;
02538   }
02539 
02540   if (it.isEnd()) it = copy;
02541 }
02542 
02548 static void moveItToPrevWord(EditableCharacterIterator &it)
02549 {
02550   if (it.isEnd()) return;
02551 
02552 #if DEBUG_CARETMODE > 0
02553   kdDebug(6200) << "%%%%%%%%%%%%%%%%%%%%% moveItToPrevWord" << endl;
02554 #endif
02555   EditableCharacterIterator copy;
02556 
02557   // Jump over all space and punctuation characters first
02558   do {
02559     copy = it;
02560     --it;
02561 #if DEBUG_CARETMODE > 2
02562     if (!it.isEnd()) kdDebug(6200) << "reading1 '" << (*it).latin1() << "'" << endl;
02563 #endif
02564   } while (!it.isEnd() && ((*it).isSpace() || (*it).isPunct()));
02565 
02566   if (it.isEnd()) {
02567     it = copy;
02568     return;
02569   }/*end if*/
02570 
02571   do {
02572     copy = it;
02573     --it;
02574 #if DEBUG_CARETMODE > 0
02575     if (!it.isEnd()) kdDebug(6200) << "reading2 '" << (*it).latin1() << "' (" << (int)(*it).latin1() << ") box " << it.caretBox() << endl;
02576 #endif
02577   } while (!it.isEnd() && !(*it).isSpace() && !(*it).isPunct());
02578 
02579   it = copy;
02580 #if DEBUG_CARETMODE > 1
02581     if (!it.isEnd()) kdDebug(6200) << "effective '" << (*it).latin1() << "' (" << (int)(*it).latin1() << ") box " << it.caretBox() << endl;
02582 #endif
02583 }
02584 
02592 static void moveIteratorByPage(LinearDocument &ld,
02593         ErgonomicEditableLineIterator &it, int mindist, bool next)
02594 {
02595   // ### This whole routine plainly sucks. Use an inverse strategie for pgup/pgdn.
02596 
02597   if (it == ld.end() || it == ld.preBegin()) return;
02598 
02599   ErgonomicEditableLineIterator copy = it;
02600 #if DEBUG_CARETMODE > 0
02601   kdDebug(6200) << " mindist: " << mindist << endl;
02602 #endif
02603 
02604   CaretBoxLine *cbl = *copy;
02605   int absx = 0, absy = 0;
02606 
02607   RenderBlock *lastcb = cbl->containingBlock();
02608   Q_ASSERT(lastcb->isRenderBlock());
02609   lastcb->absolutePosition(absx, absy, false);  // ### what about fixed?
02610 
02611   int lastfby = cbl->begin().data()->yPos();
02612   int lastheight = 0;
02613   int rescue = 1000;    // ### this is a hack to keep stuck carets from hanging the ua
02614   do {
02615     if (next) ++copy; else --copy;
02616     if (copy == ld.end() || copy == ld.preBegin()) break;
02617 
02618     cbl = *copy;
02619     RenderBlock *cb = cbl->containingBlock();
02620 
02621     int diff = 0;
02622     // ### actually flowBox->yPos() should suffice, but this is not ported
02623     // over yet from WebCore
02624     int fby = cbl->begin().data()->yPos();
02625     if (cb != lastcb) {
02626       if (next) {
02627         diff = absy + lastfby + lastheight;
02628         cb->absolutePosition(absx, absy, false);    // ### what about fixed?
02629         diff = absy - diff + fby;
02630         lastfby = 0;
02631       } else {
02632         diff = absy;
02633         cb->absolutePosition(absx, absy, false);    // ### what about fixed?
02634         diff -= absy + fby + lastheight;
02635     lastfby = fby - lastheight;
02636       }/*end if*/
02637 #if DEBUG_CARETMODE > 2
02638       kdDebug(6200) << "absdiff " << diff << endl;
02639 #endif
02640     } else {
02641       diff = kAbs(fby - lastfby);
02642     }/*end if*/
02643 #if DEBUG_CARETMODE > 2
02644     kdDebug(6200) << "cbl->begin().data()->yPos(): " << fby << " diff " << diff << endl;
02645 #endif
02646 
02647     mindist -= diff;
02648 
02649     lastheight = kAbs(fby - lastfby);
02650     lastfby = fby;
02651     lastcb = cb;
02652     it = copy;
02653 #if DEBUG_CARETMODE > 0
02654     kdDebug(6200) << " mindist: " << mindist << endl;
02655 #endif
02656     // trick: actually the distance is always one line short, but we cannot
02657     // calculate the height of the first line (### WebCore will make it better)
02658     // Therefore, we simply approximate that excess line by using the last
02659     // caluculated line height.
02660   } while (mindist - lastheight > 0 && --rescue);
02661 }
02662 
02663 
02664 }/*end namespace*/
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This file is part of the documentation for khtml Library Version 3.3.1.
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