kdbg/exprwnd.cpp

   1 // $Id$
   2
   3 // Copyright by Johannes Sixt
   4 // This file is under GPL, the GNU General Public Licence
   5
   6 #include "exprwnd.h"
   7 #include "exprwnd.moc"
   8 #include "typetable.h"
   9 #include <qstrlist.h>
  10 #include <qpainter.h>
  11 #include <qscrollbar.h>
  12 #include <kapp.h>
  13 #include <kiconloader.h>                /* icons */
  14 #ifdef HAVE_CONFIG_H
  15 #include "config.h"
  16 #endif
  17 #include "mydebug.h"
  18
  19 VarTree::VarTree(const QString& name, NameKind aKind) :
  20         KTreeViewItem(name),
  21         m_varKind(VKsimple),
  22         m_nameKind(aKind),
  23         m_valueChanged(false),
  24         m_type(0),
  25         m_exprIndex(0),
  26         m_exprIndexUseGuard(false)
  27 {
  28 }
  29
  30 VarTree::~VarTree()
  31 {
  32 }
  33
  34 void VarTree::paintValue(QPainter* p)
  35 {
  36     p->save();
  37     int cellHeight = height(p->fontMetrics());
  38     int textX = 2;
  39     int textY = (cellHeight - p->fontMetrics().height()) / 2 +
  40         p->fontMetrics().ascent();
  41
  42     if (m_valueChanged) {
  43         p->setPen(red);
  44     }
  45 //    p->setBackgroundColor(cg.base());
  46     p->drawText(textX, textY, m_value, m_value.length());
  47     p->restore();
  48 }
  49
  50 int VarTree::valueWidth()
  51 {
  52     assert(owner != 0);
  53     return owner->fontMetrics().width(m_value) + 4;
  54 }
  55
  56 QString VarTree::computeExpr() const
  57 {
  58     assert(getParent() != 0);
  59     // just to be sure
  60     if (getParent() == 0)
  61         return QString();
  62
  63     // top-level items are special
  64     if (getParent()->getParent() == 0)
  65         return getText();
  66
  67     // get parent expr
  68     VarTree* par = static_cast<VarTree*>(getParent());
  69     QString parentExpr = par->computeExpr();
  70
  71     /* don't add this item's name if this is a base class sub-item */
  72     if (m_nameKind == NKtype) {
  73         return parentExpr;
  74     }
  75     /* augment by this item's text */
  76     QString result;
  77     /* if this is an address, dereference it */
  78     if (m_nameKind == NKaddress) {
  79         ASSERT(par->m_varKind == VKpointer);
  80         result = "*" + parentExpr;
  81         return result;
  82     }
  83     switch (par->m_varKind) {
  84     case VKarray:
  85         {
  86             QString index = getText();
  87             int i = 1;
  88             // skip past the index
  89             while (index[i].isDigit())
  90                 i++;
  91             /*
  92              * Some array indices are actually ranges due to repeated array
  93              * values. We use the first index in these cases.
  94              */
  95             if (index[i] != ']') {
  96                 // remove second index
  97                 index.remove(i, index.length()-i-1);
  98             }
  99             result = "(" + parentExpr + ")" + index;
 100         }
 101         break;
 102     case VKstruct:
 103         result = "(" + parentExpr + ")." + getText();
 104         break;
 105     case VKsimple:                      /* parent can't be simple */
 106     case VKpointer:                     /* handled in NKaddress */
 107     case VKdummy:                       /* can't occur at all */
 108         ASSERT(false);
 109         result = parentExpr;            /* paranoia */
 110         break;
 111     }
 112     return result;
 113 }
 114
 115 bool VarTree::isToplevelExpr() const
 116 {
 117     return getParent() != 0 && getParent()->getParent() == 0;
 118 }
 119
 120 bool VarTree::isAncestorEq(const VarTree* child) const
 121 {
 122     const KTreeViewItem* c = child;
 123     while (c != 0 && c != this) {
 124         c = c->getParent();
 125     }
 126     return c != 0;
 127 }
 128
 129 bool VarTree::updateValue(const QString& newValue)
 130 {
 131     // check whether the value changed
 132     bool prevValueChanged = m_valueChanged;
 133     m_valueChanged = false;
 134     if (m_value != newValue) {
 135         m_value = newValue;
 136         m_valueChanged = true;
 137     }
 138     /*
 139      * We must repaint the cell if the value changed. If it did not change,
 140      * we still must repaint the cell if the value changed previously,
 141      * because the color of the display must be changed (from red to
 142      * black).
 143      */
 144     return m_valueChanged || prevValueChanged;
 145 }
 146
 147 void VarTree::inferTypesOfChildren(ProgramTypeTable& typeTable)
 148 {
 149     /*
 150      * Type inference works like this: We use type information of those
 151      * children that have a type name in their name (base classes) or in
 152      * their value (pointers)
 153      */
 154
 155     // first recurse children
 156     VarTree* child = static_cast<VarTree*>(getChild());
 157     while (child != 0) {
 158         child->inferTypesOfChildren(typeTable);
 159         child = static_cast<VarTree*>(child->getSibling());
 160     }
 161
 162     // if this is a pointer, get the type from the value (less the pointer)
 163     if (m_varKind == VKpointer) {
 164         if (isWcharT())
 165         {
 166             /*
 167              * wchart_t pointers must be treated as struct, because the array
 168              * of characters is printed similar to how QStrings are decoded.
 169              */
 170             m_varKind = VKstruct;
 171             setDelayedExpanding(false);
 172             return;
 173         }
 174 #ifndef I_know_a_way_to_do_this_cleanly
 175         return;
 176 #else
 177         const char* p = m_value.data();
 178         const char* start = p;
 179         // the type of the pointer shows up in the value (sometimes)
 180         if (p == 0 || *p != '(')
 181             return;
 182         skipNested(p, '(', ')');
 183         /*
 184          * We only recognize pointers to data "(int *)" but not pointers
 185          * to functions "(void (*)())".
 186          */
 187         if (p-start < 3 &&              /* at least 3 chars necessary: (*) */
 188             p[-2] != '*')               /* skip back before the closing paren */
 189         {
 190             return;
 191         }
 192         const QString& typeName =
 193             QString::fromLatin1(start+1, p-start-3) // minus 3 chars
 194                 .stripWhiteSpace();
 195         m_type = typeTable.lookup(typeName);
 196         if (m_type == 0) {
 197             m_type = TypeInfo::unknownType();
 198         }
 199 #endif
 200     } else if (m_varKind == VKstruct) {
 201         // check if this is a base class part
 202         if (m_nameKind == NKtype) {
 203             const QString& typeName =
 204                 text.mid(1, text.length()-2); // strip < and >
 205             m_type = typeTable.lookup(typeName);
 206
 207             /* if we don't have a type yet, get it from the base class */
 208             if (m_type == 0) {
 209                 m_type = inferTypeFromBaseClass();
 210                 /*
 211                  * If there is a known type now, it is the one from the
 212                  * first base class whose type we know.
 213                  */
 214             }
 215
 216             /*
 217              * If we still don't have a type, the type is really unknown.
 218              */
 219             if (m_type == 0) {
 220                 m_type = TypeInfo::unknownType();
 221             }
 222         } // else
 223             /*
 224              * This is not a base class part. We don't assign a type so
 225              * that later we can ask gdb.
 226              */
 227     }
 228 }
 229
 230 // the value contains the pointer type in parenthesis
 231 bool VarTree::isWcharT() const
 232 {
 233     return m_value.startsWith("(const wchar_t *)") ||
 234             m_value.startsWith("(wchar_t *)");
 235 }
 236
 237 /*
 238  * Get the type of the first base class whose type we know.
 239  */
 240 TypeInfo* VarTree::inferTypeFromBaseClass()
 241 {
 242     if (m_varKind == VKstruct) {
 243         VarTree* child = static_cast<VarTree*>(getChild());
 244         while (child != 0 &&
 245                // only check base class parts (i.e. type names)
 246                child->m_nameKind == NKtype)
 247         {
 248             if (child->m_type != 0 &&
 249                 child->m_type != TypeInfo::unknownType())
 250             {
 251                 // got a type!
 252                 return child->m_type;
 253             }
 254             child = static_cast<VarTree*>(child->getSibling());
 255         }
 256     }
 257     return 0;
 258 }
 259
 260
 261 ExprWnd::ExprWnd(QWidget* parent, const char* name) :
 262         KTreeView(parent, name),
 263         maxValueWidth(0),
 264         m_edit(this)
 265 {
 266     setNumCols(2);
 267
 268     connect(this, SIGNAL(expanded(int)), SLOT(slotExpandOrCollapse(int)));
 269     connect(this, SIGNAL(collapsed(int)), SLOT(slotExpandOrCollapse(int)));
 270
 271     m_pixPointer = UserIcon("pointer.xpm");
 272     if (m_pixPointer.isNull())
 273         TRACE("Can't load pointer.xpm");
 274 }
 275
 276 ExprWnd::~ExprWnd()
 277 {
 278 }
 279
 280 void ExprWnd::exprList(QStrList& exprs)
 281 {
 282     // ASSERT(exprs does deep-copies)
 283     KTreeViewItem* item;
 284     for (item = itemAt(0); item != 0; item = item->getSibling()) {
 285         exprs.append(item->getText());
 286     }
 287 }
 288
 289 VarTree* ExprWnd::insertExpr(VarTree* expr)
 290 {
 291     // append a new dummy expression
 292     VarTree* display = new VarTree(expr->getText(), VarTree::NKplain);
 293     insertItem(display);
 294
 295     // replace it right away
 296     updateExpr(display, expr);
 297     return display;
 298 }
 299
 300 void ExprWnd::updateExpr(VarTree* expr)
 301 {
 302     // search the root variable
 303     KPath path;
 304     path.push(expr->getText());
 305     KTreeViewItem* item = itemAt(path);
 306     if (item == 0) {
 307         return;
 308     }
 309     // now update it
 310     if (updateExprRec(static_cast<VarTree*>(item), expr)) {
 311         updateVisibleItems();
 312         updateValuesWidth();
 313         repaint();
 314     }
 315     collectUnknownTypes(static_cast<VarTree*>(item));
 316 }
 317
 318 void ExprWnd::updateExpr(VarTree* display, VarTree* newValues)
 319 {
 320     if (updateExprRec(display, newValues) && display->isVisible()) {
 321         updateVisibleItems();
 322         updateValuesWidth();
 323         repaint();
 324     }
 325     collectUnknownTypes(display);
 326 }
 327
 328 /*
 329  * returns true if there's a visible change
 330  */
 331 bool ExprWnd::updateExprRec(VarTree* display, VarTree* newValues)
 332 {
 333     bool isExpanded = display->isExpanded();
 334
 335     /*
 336      * If we are updating a pointer without children by a dummy, we don't
 337      * collapse it, but simply insert the new children. This happens when a
 338      * pointer has just been expanded by the user.
 339      */
 340     if (display->m_varKind == VarTree::VKpointer &&
 341         display->childCount() == 0 &&
 342         newValues->m_varKind == VarTree::VKdummy)
 343     {
 344         replaceChildren(display, newValues);
 345         return isExpanded;              /* no visible change if not expanded */
 346     }
 347
 348     /*
 349      * If the display and newValues have different kind or if their number
 350      * of children is different, replace the whole sub-tree.
 351      */
 352     if (// the next two lines mean: not(m_varKind remains unchanged)
 353         !(newValues->m_varKind == VarTree::VKdummy ||
 354           display->m_varKind == newValues->m_varKind)
 355         ||
 356         (display->childCount() != newValues->childCount() &&
 357          /*
 358           * If this is a pointer and newValues doesn't have children, we
 359           * don't replace the sub-tree; instead, below we mark this
 360           * sub-tree for requiring an update.
 361           */
 362          (display->m_varKind != VarTree::VKpointer ||
 363           newValues->childCount() != 0)))
 364     {
 365         if (isExpanded) {
 366             collapseSubTree(display, false);
 367         }
 368
 369         // since children changed, it is likely that the type has also changed
 370         display->m_type = 0;            /* will re-evaluate the type */
 371
 372         // display the new value
 373         updateSingleExpr(display, newValues);
 374         replaceChildren(display, newValues);
 375
 376         // update the m_varKind
 377         if (newValues->m_varKind != VarTree::VKdummy) {
 378             display->m_varKind = newValues->m_varKind;
 379             display->setDelayedExpanding(newValues->m_varKind == VarTree::VKpointer);
 380         }
 381
 382         // (note that the new value might not have a sub-tree at all)
 383         return display->m_valueChanged || isExpanded;   /* no visible change if not expanded */
 384     }
 385
 386     // display the new value
 387     updateSingleExpr(display, newValues);
 388
 389     /*
 390      * If this is an expanded pointer, record it for being updated.
 391      */
 392     if (display->m_varKind == VarTree::VKpointer) {
 393         if (isExpanded &&
 394             // if newValues is a dummy, we have already updated this pointer
 395             newValues->m_varKind != VarTree::VKdummy)
 396         {
 397             m_updatePtrs.append(display);
 398         }
 399         /*
 400          * If the visible sub-tree has children, but newValues doesn't, we
 401          * can stop here.
 402          */
 403         if (newValues->childCount() == 0) {
 404             return display->m_valueChanged;
 405         }
 406     }
 407
 408     ASSERT(display->childCount() == newValues->childCount());
 409
 410     // go for children
 411     bool childChanged = false;
 412
 413     VarTree* vDisplay = static_cast<VarTree*>(display->getChild());
 414     VarTree* vNew = static_cast<VarTree*>(newValues->getChild());
 415     while (vDisplay != 0) {
 416         // check whether the names are the same
 417         if (strcmp(vDisplay->getText(), vNew->getText()) != 0) {
 418             // set new name
 419             vDisplay->setText(vNew->getText());
 420             int i = itemRow(vDisplay);
 421             if (i >= 0) {
 422                 updateCell(i, 0, true);
 423                 childChanged = true;
 424             }
 425         }
 426         // recurse
 427         if (updateExprRec(vDisplay, vNew)) {
 428             childChanged = true;
 429         }
 430         vDisplay = static_cast<VarTree*>(vDisplay->getSibling());
 431         vNew = static_cast<VarTree*>(vNew->getSibling());
 432     }
 433
 434     // update of children propagates only if this node is expanded
 435     return display->m_valueChanged || (display->isExpanded() && childChanged);
 436 }
 437
 438 void ExprWnd::updateSingleExpr(VarTree* display, VarTree* newValue)
 439 {
 440     /*
 441      * If newValues is a VKdummy, we are only interested in its children.
 442      * No need to update anything here.
 443      */
 444     if (newValue->m_varKind == VarTree::VKdummy) {
 445         return;
 446     }
 447
 448     /*
 449      * If this node is a struct and we know its type then don't update its
 450      * value now. This is a node for which we know how to find a nested
 451      * value. So register the node for an update.
 452      *
 453      * wchar_t types are also treated specially here: We consider them
 454      * as struct (has been set in inferTypesOfChildren()).
 455      */
 456     if (display->m_varKind == VarTree::VKstruct &&
 457         display->m_type != 0 &&
 458         display->m_type != TypeInfo::unknownType())
 459     {
 460         ASSERT(newValue->m_varKind == VarTree::VKstruct);
 461         if (display->m_type == TypeInfo::wchartType())
 462         {
 463             /*
 464              * We do not copy the new pointer value to the destination right
 465              * away, but consider it as the first part of the nested value.
 466              * Then the display will change its color only when the new value
 467              * is completed.
 468              */
 469             display->m_partialValue = formatWCharPointer(newValue->m_value);
 470         }
 471         else
 472             display->m_partialValue = display->m_type->m_displayString[0];
 473         m_updateStruct.append(display);
 474     }
 475     else
 476     {
 477         if (display->updateValue(newValue->m_value)) {
 478             int i = itemRow(display);
 479             if (i >= 0) {
 480                 updateCell(i, 1, true);
 481             }
 482         }
 483     }
 484 }
 485
 486 void ExprWnd::updateStructValue(VarTree* display)
 487 {
 488     ASSERT(display->m_varKind == VarTree::VKstruct);
 489
 490     if (display->updateValue(display->m_partialValue)) {
 491         int i = itemRow(display);
 492         if (i >= 0) {
 493             updateValuesWidth();
 494             updateCell(i, 1, true);
 495         }
 496     }
 497     // reset the value
 498     display->m_partialValue = "";
 499     display->m_exprIndex = -1;
 500 }
 501
 502 void ExprWnd::replaceChildren(VarTree* display, VarTree* newValues)
 503 {
 504     ASSERT(display->childCount() == 0 || display->m_varKind != VarTree::VKsimple);
 505
 506     // delete all children of display
 507     while (VarTree* c = static_cast<VarTree*>(display->getChild())) {
 508         unhookSubtree(c);
 509         display->removeChild(c);
 510         delete c;
 511     }
 512     // insert copies of the newValues
 513     for (KTreeViewItem* c = newValues->getChild(); c != 0; c = c->getSibling()) {
 514         VarTree* v = static_cast<VarTree*>(c);
 515         VarTree* vNew = new VarTree(v->getText(), v->m_nameKind);
 516         vNew->m_varKind = v->m_varKind;
 517         vNew->m_value = v->m_value;
 518         vNew->m_type = v->m_type;
 519         vNew->setDelayedExpanding(vNew->m_varKind == VarTree::VKpointer);
 520         vNew->setExpanded(v->isExpanded());
 521         display->appendChild(vNew);
 522         // recurse
 523         replaceChildren(vNew, v);
 524     }
 525 }
 526
 527 void ExprWnd::collectUnknownTypes(VarTree* var)
 528 {
 529     /*
 530      * forEveryItem does not scan the root item itself. So we must do it
 531      * ourselves.
 532      */
 533     ASSERT(var->m_varKind != VarTree::VKpointer || var->m_nameKind != VarTree::NKtype);
 534     if (var->m_type == 0 &&
 535         var->m_varKind == VarTree::VKstruct &&
 536         var->m_nameKind != VarTree::NKtype)
 537     {
 538         if (!var->isWcharT())
 539         {
 540             /* this struct node doesn't have a type yet: register it */
 541             m_updateType.append(var);
 542         }
 543         else
 544         {
 545             var->m_type = TypeInfo::wchartType();
 546             // see updateSingleExpr() why we move the value
 547             var->m_partialValue = formatWCharPointer(var->m_value);
 548             var->m_value.truncate(0);
 549             m_updateStruct.append(var);
 550         }
 551     }
 552
 553     // add pointer pixmap to pointers
 554     if (var->m_varKind == VarTree::VKpointer) {
 555         var->setPixmap(m_pixPointer);
 556     }
 557
 558     forEveryItem(collectUnknownTypes, this, var);
 559 }
 560
 561 bool ExprWnd::collectUnknownTypes(KTreeViewItem* item, void* user)
 562 {
 563     VarTree* var = static_cast<VarTree*>(item);
 564     ExprWnd* tree = static_cast<ExprWnd*>(user);
 565     ASSERT(var->m_varKind != VarTree::VKpointer || var->m_nameKind != VarTree::NKtype);
 566     if (var->m_type == 0 &&
 567         var->m_varKind == VarTree::VKstruct &&
 568         var->m_nameKind != VarTree::NKtype)
 569     {
 570         if (!var->isWcharT())
 571         {
 572             /* this struct node doesn't have a type yet: register it */
 573             tree->m_updateType.append(var);
 574         }
 575         else
 576         {
 577             var->m_type = TypeInfo::wchartType();
 578             // see updateSingleExpr() why we move the value
 579             var->m_partialValue = formatWCharPointer(var->m_value);
 580             var->m_value.truncate(0);
 581             tree->m_updateStruct.append(var);
 582         }
 583     }
 584     // add pointer pixmap to pointers
 585     if (var->m_varKind == VarTree::VKpointer) {
 586         var->setPixmap(tree->m_pixPointer);
 587     }
 588     return false;
 589 }
 590
 591 QString ExprWnd::formatWCharPointer(QString value)
 592 {
 593     int pos = value.find(") ");
 594     if (pos > 0)
 595         value = value.mid(pos+2);
 596     return value + " L";
 597 }
 598
 599
 600 VarTree* ExprWnd::topLevelExprByName(const char* name)
 601 {
 602     KPath path;
 603     path.push(name);
 604     KTreeViewItem* item = itemAt(path);
 605
 606     return static_cast<VarTree*>(item);
 607 }
 608
 609 VarTree* ExprWnd::ptrMemberByName(VarTree* v, const QString& name)
 610 {
 611     // v must be a pointer variable, must have children
 612     if (v->m_varKind != VarTree::VKpointer || v->childCount() == 0)
 613         return 0;
 614
 615     // the only child of v is the pointer value that represents the struct
 616     KTreeViewItem* item = v->getChild();
 617     return memberByName(static_cast<VarTree*>(item), name);
 618 }
 619
 620 VarTree* ExprWnd::memberByName(VarTree* v, const QString& name)
 621 {
 622     // search immediate children for name
 623     KTreeViewItem* item = v->getChild();
 624     while (item != 0 && item->getText() != name)
 625         item = item->getSibling();
 626
 627     if (item != 0)
 628         return static_cast<VarTree*>(item);
 629
 630     // try in base classes
 631     item = v->getChild();
 632     while (item != 0 &&
 633            static_cast<VarTree*>(item)->m_nameKind == VarTree::NKtype)
 634     {
 635         v = memberByName(static_cast<VarTree*>(item), name);
 636         if (v != 0)
 637             return v;
 638         item = item->getSibling();
 639     }
 640     return 0;
 641 }
 642
 643 void ExprWnd::removeExpr(VarTree* item)
 644 {
 645     unhookSubtree(item);
 646
 647     takeItem(item);
 648     delete item;
 649
 650     updateValuesWidth();
 651 }
 652
 653 void ExprWnd::unhookSubtree(VarTree* subTree)
 654 {
 655     // must remove any pointers scheduled for update from the list
 656     unhookSubtree(m_updatePtrs, subTree);
 657     unhookSubtree(m_updateType, subTree);
 658     unhookSubtree(m_updateStruct, subTree);
 659     emit removingItem(subTree);
 660 }
 661
 662 void ExprWnd::unhookSubtree(QList<VarTree>& list, VarTree* subTree)
 663 {
 664     if (subTree == 0)
 665         return;
 666
 667     VarTree* checkItem = list.first();
 668     while (checkItem != 0) {
 669         if (!subTree->isAncestorEq(checkItem)) {
 670             // checkItem is not an item from subTree
 671             // advance
 672             checkItem = list.next();
 673         } else {
 674             // checkItem is an item from subTree
 675             /*
 676              * If checkItem is the last item in the list, we need a special
 677              * treatment, because remove()ing it steps the current item of
 678              * the list in the "wrong" direction.
 679              */
 680             if (checkItem == list.getLast()) { // does not set current item
 681                 list.remove();
 682                 /* we deleted the last element, so we've finished */
 683                 checkItem = 0;
 684             } else {
 685                 list.remove();
 686                 /* remove() advanced already */
 687                 checkItem = list.current();
 688             }
 689         }
 690     }
 691 }
 692
 693 void ExprWnd::clearPendingUpdates()
 694 {
 695     m_updatePtrs.clear();
 696     m_updateType.clear();
 697     m_updateStruct.clear();
 698 }
 699
 700 VarTree* ExprWnd::nextUpdatePtr()
 701 {
 702     VarTree* ptr = m_updatePtrs.first();
 703     if (ptr != 0) {
 704         m_updatePtrs.remove();
 705     }
 706     return ptr;
 707 }
 708
 709 VarTree* ExprWnd::nextUpdateType()
 710 {
 711     VarTree* ptr = m_updateType.first();
 712     if (ptr != 0) {
 713         m_updateType.remove();
 714     }
 715     return ptr;
 716 }
 717
 718 VarTree* ExprWnd::nextUpdateStruct()
 719 {
 720     VarTree* ptr = m_updateStruct.first();
 721     if (ptr != 0) {
 722         m_updateStruct.remove();
 723     }
 724     return ptr;
 725 }
 726
 727 void ExprWnd::paintCell(QPainter* painter, int row, int col)
 728 {
 729     if (col == 0) {
 730         KTreeView::paintCell(painter, row, col);
 731     } else {
 732         VarTree* item = static_cast<VarTree*>(itemAt(row));
 733         if (item != 0) {
 734             item->paintValue(painter);
 735         }
 736     }
 737 }
 738
 739 int ExprWnd::cellWidth(int col) const
 740 {
 741     if (col == 0) {
 742         return KTreeView::cellWidth(col);
 743     } else {
 744         return maxValueWidth;
 745     }
 746 }
 747
 748 void ExprWnd::updateValuesWidth()
 749 {
 750     int maxW = 0;
 751     forEveryVisibleItem(static_cast<KForEveryFunc>(&getMaxValueWidth), &maxW);
 752     maxValueWidth = maxW;
 753     updateTableSize();
 754 }
 755
 756 // called by updateValuesWidth() for each item in the visible list
 757 bool ExprWnd::getMaxValueWidth(KTreeViewItem* item, void* user)
 758 {
 759     int *maxW = (int *)user;
 760     VarTree* v = static_cast<VarTree*>(item);
 761     int w = v->valueWidth();
 762     if(w > *maxW)
 763         *maxW = w;
 764     return false;
 765 }
 766
 767 void ExprWnd::slotExpandOrCollapse(int)
 768 {
 769     updateValuesWidth();
 770 }
 771
 772 void ExprWnd::editValue(int row, const QString& text)
 773 {
 774     int x;
 775     colXPos(1, &x);
 776     int y;
 777     rowYPos(row, &y);
 778     int w = cellWidth(1);
 779     int h = cellHeight(row);
 780     QScrollBar* sbV = static_cast<QScrollBar*>(child("table_sbV"));
 781
 782     /*
 783      * Make the edit widget at least 5 characters wide (but not wider than
 784      * this widget). If less than half of this widget is used to display
 785      * the text, scroll this widget so that half of it shows the text (or
 786      * less than half of it if the text is shorter).
 787      */
 788     QFontMetrics metr = m_edit.font();
 789     int wMin = metr.width("88888");
 790     if (w < wMin)
 791         w = wMin;
 792     int wThis = width();
 793     if (sbV->isVisible())       // subtract width of scrollbar
 794         wThis -= sbV->width();
 795     if (x >= wThis/2 &&         // less than half the width displays text
 796         x+w > wThis)            // not all text is visible
 797     {
 798         // scroll so that more text is visible
 799         int wScroll = QMIN(x-wThis/2, x+w-wThis);
 800         sbHor(xOffset()+wScroll);
 801         colXPos(1, &x);
 802     }
 803     else if (x < 0)
 804     {
 805         // don't let the edit move out at the left
 806         x = 0;
 807     }
 808
 809     // make the edit box as wide as the visible column
 810     QRect rect(x,y, wThis-x,h);
 811     m_edit.setText(text);
 812     m_edit.selectAll();
 813
 814     m_edit.setGeometry(rect);
 815     m_edit.m_finished = false;
 816     m_edit.m_row = row;
 817     m_edit.show();
 818     m_edit.setFocus();
 819 }
 820
 821 bool ExprWnd::isEditing() const
 822 {
 823     return m_edit.isVisible();
 824 }
 825
 826
 827 ValueEdit::ValueEdit(ExprWnd* parent) :
 828         QLineEdit(parent, "valueedit")
 829 {
 830     setFrame(false);
 831     hide();
 832     lower();    // lower the window below scrollbars
 833     connect(parent, SIGNAL(selected(int)), SLOT(slotSelectionChanged()));
 834     connect(parent, SIGNAL(collapsed(int)), SLOT(slotSelectionChanged()));
 835     connect(parent, SIGNAL(expanded(int)), SLOT(slotSelectionChanged()));
 836     connect(this, SIGNAL(done(int, const QString&)),
 837             parent, SIGNAL(editValueCommitted(int, const QString&)));
 838 }
 839
 840 ValueEdit::~ValueEdit()
 841 {
 842 }
 843
 844 void ValueEdit::terminate(bool commit)
 845 {
 846     TRACE(commit?"ValueEdit::terminate(true)":"ValueEdit::terminate(false)");
 847     if (!m_finished)
 848     {
 849         m_finished = true;
 850         hide(); // will call focusOutEvent, that's why we need m_finished
 851         if (commit) {
 852             emit done(m_row, text());
 853         }
 854     }
 855 }
 856
 857 void ValueEdit::keyPressEvent(QKeyEvent *e)
 858 {
 859     if(e->key() == Qt::Key_Return || e->key() == Qt::Key_Enter)
 860         terminate(true);
 861     else if(e->key() == Qt::Key_Escape)
 862         terminate(false);
 863     else
 864         QLineEdit::keyPressEvent(e);
 865 }
 866
 867 void ValueEdit::paintEvent(QPaintEvent* e)
 868 {
 869     QLineEdit::paintEvent(e);
 870
 871     QPainter p(this);
 872     p.drawRect(rect());
 873 }
 874
 875 void ValueEdit::focusOutEvent(QFocusEvent* ev)
 876 {
 877     TRACE("ValueEdit::focusOutEvent");
 878     QFocusEvent* focusEv = static_cast<QFocusEvent*>(ev);
 879     // Don't let a RMB close the editor
 880     if (focusEv->reason() != QFocusEvent::Popup &&
 881         focusEv->reason() != QFocusEvent::ActiveWindow)
 882     {
 883         terminate(true);
 884     }
 885 }
 886
 887 void ValueEdit::slotSelectionChanged()
 888 {
 889     TRACE("ValueEdit::slotSelectionChanged");
 890     terminate(false);
 891 }