src/klistview.cpp

   1 /**
   2   * This file is part of the KDE project
   3   * Copyright (C) 2007 Rafael Fernández López <ereslibre@gmail.com>
   4   *
   5   * This library is free software; you can redistribute it and/or
   6   * modify it under the terms of the GNU Library General Public
   7   * License as published by the Free Software Foundation; either
   8   * version 2 of the License, or (at your option) any later version.
   9   *
  10   * This library is distributed in the hope that it will be useful,
  11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13   * Library General Public License for more details.
  14   *
  15   * You should have received a copy of the GNU Library General Public License
  16   * along with this library; see the file COPYING.LIB.  If not, write to
  17   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18   * Boston, MA 02110-1301, USA.
  19   */
  20
  21 #include "klistview.h"
  22 #include "klistview_p.h"
  23
  24 #include <math.h> // trunc on C99 compliant systems
  25 #include <kdefakes.h> // trunc for not C99 compliant systems
  26
  27 #include <QApplication>
  28 #include <QPainter>
  29 #include <QScrollBar>
  30 #include <QPaintEvent>
  31
  32 #include <kdebug.h>
  33 #include <kstyle.h>
  34
  35 #include "kitemcategorizer.h"
  36 #include "ksortfilterproxymodel.h"
  37
  38 class LessThan
  39 {
  40 public:
  41     enum Purpose
  42     {
  43         GeneralPurpose = 0,
  44         CategoryPurpose
  45     };
  46
  47     inline LessThan(const KSortFilterProxyModel *proxyModel,
  48                     Purpose purpose)
  49         : proxyModel(proxyModel)
  50         , purpose(purpose)
  51     {
  52     }
  53
  54     inline bool operator()(const QModelIndex &left,
  55                            const QModelIndex &right) const
  56     {
  57         if (purpose == GeneralPurpose)
  58         {
  59             return proxyModel->sortOrder() == Qt::AscendingOrder ?
  60                    proxyModel->lessThanGeneralPurpose(left, right) :
  61                    !proxyModel->lessThanGeneralPurpose(left, right);
  62         }
  63
  64         return proxyModel->sortOrder() == Qt::AscendingOrder ?
  65                proxyModel->lessThanCategoryPurpose(left, right) :
  66                !proxyModel->lessThanCategoryPurpose(left, right);
  67     }
  68
  69 private:
  70     const KSortFilterProxyModel *proxyModel;
  71     const Purpose purpose;
  72 };
  73
  74
  75 //==============================================================================
  76
  77
  78 KListView::Private::Private(KListView *listView)
  79     : listView(listView)
  80     , itemCategorizer(0)
  81     , mouseButtonPressed(false)
  82     , proxyModel(0)
  83     , lastIndex(QModelIndex())
  84 {
  85 }
  86
  87 KListView::Private::~Private()
  88 {
  89 }
  90
  91 const QModelIndexList &KListView::Private::intersectionSet(const QRect &rect)
  92 {
  93     QModelIndex index;
  94     QRect indexVisualRect;
  95
  96     intersectedIndexes.clear();
  97
  98     // Lets find out where we should start
  99     int top = proxyModel->rowCount() - 1;
 100     int bottom = 0;
 101     int middle = (top + bottom) / 2;
 102     while (bottom <= top)
 103     {
 104         middle = (top + bottom) / 2;
 105
 106         index = elementDictionary[proxyModel->index(middle, 0)];
 107         indexVisualRect = visualRect(index);
 108
 109         if (qMax(indexVisualRect.topLeft().y(),
 110                  indexVisualRect.bottomRight().y()) < qMin(rect.topLeft().y(),
 111                                                         rect.bottomRight().y()))
 112         {
 113             bottom = middle + 1;
 114         }
 115         else
 116         {
 117             top = middle - 1;
 118         }
 119     }
 120
 121     int j = 0;
 122     for (int i = middle; i < proxyModel->rowCount(); i++)
 123     {
 124         index = elementDictionary[proxyModel->index(i, 0)];
 125         indexVisualRect = visualRect(index);
 126
 127         if (rect.intersects(indexVisualRect))
 128             intersectedIndexes.append(index);
 129
 130         // If we passed next item, stop searching for hits
 131         if (qMax(rect.bottomRight().y(), rect.topLeft().y()) <
 132                                                   indexVisualRect.topLeft().y())
 133             break;
 134
 135         j++;
 136     }
 137
 138     return intersectedIndexes;
 139 }
 140
 141 QRect KListView::Private::visualRectInViewport(const QModelIndex &index) const
 142 {
 143     if (!index.isValid())
 144         return QRect();
 145
 146     QString curCategory = elementsInfo[index].category;
 147
 148     QRect retRect(listView->spacing(), listView->spacing() * 2 +
 149                        30 /* categoryHeight */, 0, 0);
 150
 151     int viewportWidth = listView->viewport()->width() - listView->spacing();
 152
 153     // We really need all items to be of same size. Otherwise we cannot do this
 154     // (ereslibre)
 155     // QSize itemSize =
 156     //             listView->sizeHintForIndex(proxyModel->mapFromSource(index));
 157     // int itemHeight = itemSize.height();
 158     // int itemWidth = itemSize.width();*/
 159     int itemHeight = 107;
 160     int itemWidth = 130;
 161     int itemWidthPlusSeparation = listView->spacing() + itemWidth;
 162     int elementsPerRow = viewportWidth / itemWidthPlusSeparation;
 163     if (!elementsPerRow)
 164         elementsPerRow++;
 165
 166     int column = elementsInfo[index].relativeOffsetToCategory % elementsPerRow;
 167     int row = elementsInfo[index].relativeOffsetToCategory / elementsPerRow;
 168
 169     retRect.setLeft(retRect.left() + column * listView->spacing() +
 170                     column * itemWidth);
 171
 172     float rows;
 173     int rowsInt;
 174     foreach (const QString &category, categories)
 175     {
 176         if (category == curCategory)
 177             break;
 178
 179         rows = (float) ((float) categoriesIndexes[category].count() /
 180                         (float) elementsPerRow);
 181         rowsInt = categoriesIndexes[category].count() / elementsPerRow;
 182
 183         if (rows - trunc(rows)) rowsInt++;
 184
 185         retRect.setTop(retRect.top() +
 186                        (rowsInt * listView->spacing()) +
 187                        (rowsInt * itemHeight) +
 188                        30 /* categoryHeight */ +
 189                        listView->spacing() * 2);
 190     }
 191
 192     retRect.setTop(retRect.top() + row * listView->spacing() +
 193                    row * itemHeight);
 194
 195     retRect.setWidth(itemWidth);
 196     retRect.setHeight(itemHeight);
 197
 198     return retRect;
 199 }
 200
 201 QRect KListView::Private::visualCategoryRectInViewport(const QString &category)
 202                                                                            const
 203 {
 204     QRect retRect(listView->spacing(),
 205                   listView->spacing(),
 206                   listView->viewport()->width() - listView->spacing() * 2,
 207                   0);
 208
 209     if (!proxyModel->rowCount() || !categories.contains(category))
 210         return QRect();
 211
 212     QModelIndex index = proxyModel->index(0, 0, QModelIndex());
 213
 214     int viewportWidth = listView->viewport()->width() - listView->spacing();
 215
 216     // We really need all items to be of same size. Otherwise we cannot do this
 217     // (ereslibre)
 218     // QSize itemSize = listView->sizeHintForIndex(index);
 219     // int itemHeight = itemSize.height();
 220     // int itemWidth = itemSize.width();
 221     int itemHeight = 107;
 222     int itemWidth = 130;
 223     int itemWidthPlusSeparation = listView->spacing() + itemWidth;
 224     int elementsPerRow = viewportWidth / itemWidthPlusSeparation;
 225
 226     if (!elementsPerRow)
 227         elementsPerRow++;
 228
 229     float rows;
 230     int rowsInt;
 231     foreach (const QString &itCategory, categories)
 232     {
 233         if (itCategory == category)
 234             break;
 235
 236         rows = (float) ((float) categoriesIndexes[itCategory].count() /
 237                         (float) elementsPerRow);
 238         rowsInt = categoriesIndexes[itCategory].count() / elementsPerRow;
 239
 240         if (rows - trunc(rows)) rowsInt++;
 241
 242         retRect.setTop(retRect.top() +
 243                        (rowsInt * listView->spacing()) +
 244                        (rowsInt * itemHeight) +
 245                        30 /* categoryHeight */ +
 246                        listView->spacing() * 2);
 247     }
 248
 249     retRect.setHeight(30 /* categoryHeight */);
 250
 251     return retRect;
 252 }
 253
 254 // We're sure elementsPosition doesn't contain index
 255 const QRect &KListView::Private::cacheIndex(const QModelIndex &index)
 256 {
 257     QRect rect = visualRectInViewport(index);
 258     elementsPosition[index] = rect;
 259
 260     return elementsPosition[index];
 261 }
 262
 263 // We're sure categoriesPosition doesn't contain category
 264 const QRect &KListView::Private::cacheCategory(const QString &category)
 265 {
 266     QRect rect = visualCategoryRectInViewport(category);
 267     categoriesPosition[category] = rect;
 268
 269     return categoriesPosition[category];
 270 }
 271
 272 const QRect &KListView::Private::cachedRectIndex(const QModelIndex &index)
 273 {
 274     if (elementsPosition.contains(index)) // If we have it cached
 275     {                                        // return it
 276         return elementsPosition[index];
 277     }
 278     else                                     // Otherwise, cache it
 279     {                                        // and return it
 280         return cacheIndex(index);
 281     }
 282 }
 283
 284 const QRect &KListView::Private::cachedRectCategory(const QString &category)
 285 {
 286     if (categoriesPosition.contains(category)) // If we have it cached
 287     {                                                // return it
 288         return categoriesPosition[category];
 289     }
 290     else                                            // Otherwise, cache it and
 291     {                                               // return it
 292         return cacheCategory(category);
 293     }
 294 }
 295
 296 QRect KListView::Private::visualRect(const QModelIndex &index)
 297 {
 298     QModelIndex mappedIndex = proxyModel->mapToSource(index);
 299
 300     QRect retRect = cachedRectIndex(mappedIndex);
 301     int dx = -listView->horizontalOffset();
 302     int dy = -listView->verticalOffset();
 303     retRect.adjust(dx, dy, dx, dy);
 304
 305     return retRect;
 306 }
 307
 308 QRect KListView::Private::categoryVisualRect(const QString &category)
 309 {
 310     QRect retRect = cachedRectCategory(category);
 311     int dx = -listView->horizontalOffset();
 312     int dy = -listView->verticalOffset();
 313     retRect.adjust(dx, dy, dx, dy);
 314
 315     return retRect;
 316 }
 317
 318 void KListView::Private::drawNewCategory(const QString &category,
 319                                          const QStyleOption &option,
 320                                          QPainter *painter)
 321 {
 322     QColor color = option.palette.color(QPalette::Text);
 323
 324     painter->save();
 325     painter->setRenderHint(QPainter::Antialiasing);
 326
 327     QStyleOptionButton opt;
 328
 329     opt.rect = option.rect;
 330     opt.palette = option.palette;
 331     opt.direction = option.direction;
 332     opt.text = category;
 333
 334     if (option.rect.contains(listView->viewport()->mapFromGlobal(QCursor::pos())) &&
 335         !mouseButtonPressed)
 336     {
 337         const QPalette::ColorGroup group =
 338                                           option.state & QStyle::State_Enabled ?
 339                                           QPalette::Normal : QPalette::Disabled;
 340
 341         QLinearGradient gradient(option.rect.topLeft(),
 342                                  option.rect.bottomRight());
 343         gradient.setColorAt(0,
 344                             option.palette.color(group,
 345                                                  QPalette::Highlight).light());
 346         gradient.setColorAt(1, Qt::transparent);
 347
 348         painter->fillRect(option.rect, gradient);
 349     }
 350
 351     /*if (const KStyle *style = dynamic_cast<const KStyle*>(QApplication::style()))
 352         {
 353         style->drawControl(KStyle::CE_Category, &opt, painter, this);
 354         }
 355     else
 356     {*/
 357         QFont painterFont = painter->font();
 358         painterFont.setWeight(QFont::Bold);
 359         QFontMetrics metrics(painterFont);
 360         painter->setFont(painterFont);
 361
 362         QPainterPath path;
 363         path.addRect(option.rect.left(),
 364                      option.rect.bottom() - 2,
 365                      option.rect.width(),
 366                      2);
 367
 368         QLinearGradient gradient(option.rect.topLeft(),
 369                                  option.rect.bottomRight());
 370         gradient.setColorAt(0, color);
 371         gradient.setColorAt(1, Qt::transparent);
 372
 373         painter->setBrush(gradient);
 374         painter->fillPath(path, gradient);
 375
 376         painter->setPen(color);
 377
 378         painter->drawText(option.rect, Qt::AlignVCenter | Qt::AlignLeft,
 379              metrics.elidedText(category, Qt::ElideRight, option.rect.width()));
 380     //}
 381     painter->restore();
 382 }
 383
 384
 385 void KListView::Private::updateScrollbars()
 386 {
 387     int lastItemBottom = cachedRectIndex(lastIndex).bottom() +
 388                            listView->spacing() - listView->viewport()->height();
 389
 390     listView->verticalScrollBar()->setSingleStep(listView->viewport()->height() / 10);
 391     listView->verticalScrollBar()->setPageStep(listView->viewport()->height());
 392     listView->verticalScrollBar()->setRange(0, lastItemBottom);
 393 }
 394
 395
 396 //==============================================================================
 397
 398
 399 KListView::KListView(QWidget *parent)
 400     : QListView(parent)
 401     , d(new Private(this))
 402 {
 403 }
 404
 405 KListView::~KListView()
 406 {
 407     delete d;
 408 }
 409
 410 void KListView::setModel(QAbstractItemModel *model)
 411 {
 412     if (d->proxyModel)
 413     {
 414         QObject::disconnect(d->proxyModel,
 415                             SIGNAL(rowsRemoved(QModelIndex,int,int)),
 416                             this, SLOT(rowsRemoved(QModelIndex,int,int)));
 417
 418         QObject::disconnect(d->proxyModel,
 419                             SIGNAL(sortingRoleChanged()),
 420                             this, SLOT(slotSortingRoleChanged()));
 421     }
 422
 423     QListView::setModel(model);
 424
 425     d->proxyModel = dynamic_cast<KSortFilterProxyModel*>(model);
 426
 427     if (d->proxyModel)
 428     {
 429         QObject::connect(d->proxyModel,
 430                          SIGNAL(rowsRemoved(QModelIndex,int,int)),
 431                          this, SLOT(rowsRemoved(QModelIndex,int,int)));
 432
 433         QObject::connect(d->proxyModel,
 434                          SIGNAL(sortingRoleChanged()),
 435                          this, SLOT(slotSortingRoleChanged()));
 436     }
 437 }
 438
 439 QRect KListView::visualRect(const QModelIndex &index) const
 440 {
 441     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 442         !d->itemCategorizer)
 443     {
 444         return QListView::visualRect(index);
 445     }
 446
 447     if (!qobject_cast<const QSortFilterProxyModel*>(index.model()))
 448     {
 449         return d->visualRect(d->proxyModel->mapFromSource(index));
 450     }
 451
 452     return d->visualRect(index);
 453 }
 454
 455 KItemCategorizer *KListView::itemCategorizer() const
 456 {
 457     return d->itemCategorizer;
 458 }
 459
 460 void KListView::setItemCategorizer(KItemCategorizer *itemCategorizer)
 461 {
 462     if (!itemCategorizer && d->proxyModel)
 463     {
 464         QObject::disconnect(d->proxyModel,
 465                             SIGNAL(rowsRemoved(QModelIndex,int,int)),
 466                             this, SLOT(rowsRemoved(QModelIndex,int,int)));
 467
 468         QObject::disconnect(d->proxyModel,
 469                             SIGNAL(sortingRoleChanged()),
 470                             this, SLOT(slotSortingRoleChanged()));
 471     }
 472     else if (itemCategorizer && d->proxyModel)
 473     {
 474         QObject::connect(d->proxyModel,
 475                          SIGNAL(rowsRemoved(QModelIndex,int,int)),
 476                          this, SLOT(rowsRemoved(QModelIndex,int,int)));
 477
 478         QObject::connect(d->proxyModel,
 479                          SIGNAL(sortingRoleChanged()),
 480                          this, SLOT(slotSortingRoleChanged()));
 481     }
 482
 483     d->itemCategorizer = itemCategorizer;
 484
 485     if (itemCategorizer)
 486     {
 487         rowsInserted(QModelIndex(), 0, d->proxyModel->rowCount() - 1);
 488     }
 489 }
 490
 491 QModelIndex KListView::indexAt(const QPoint &point) const
 492 {
 493     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 494         !d->itemCategorizer)
 495     {
 496         return QListView::indexAt(point);
 497     }
 498
 499     QModelIndex index;
 500
 501     QModelIndexList item = d->intersectionSet(QRect(point, point));
 502
 503     if (item.count() == 1)
 504     {
 505         index = item[0];
 506     }
 507
 508     d->hovered = index;
 509
 510     return index;
 511 }
 512
 513 void KListView::reset()
 514 {
 515     QListView::reset();
 516
 517     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 518         !d->itemCategorizer)
 519     {
 520         return;
 521     }
 522
 523     d->elementsInfo.clear();
 524     d->elementsPosition.clear();
 525     d->elementDictionary.clear();
 526     d->categoriesIndexes.clear();
 527     d->categoriesPosition.clear();
 528     d->categories.clear();
 529     d->intersectedIndexes.clear();
 530     d->sourceModelIndexList.clear();
 531     d->hovered = QModelIndex();
 532     d->mouseButtonPressed = false;
 533 }
 534
 535 void KListView::paintEvent(QPaintEvent *event)
 536 {
 537     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 538         !d->itemCategorizer)
 539     {
 540         QListView::paintEvent(event);
 541         return;
 542     }
 543
 544     QStyleOptionViewItemV3 option = viewOptions();
 545     QPainter painter(viewport());
 546     QRect area = event->rect();
 547     const bool focus = (hasFocus() || viewport()->hasFocus()) &&
 548                         currentIndex().isValid();
 549     const QStyle::State state = option.state;
 550     const bool enabled = (state & QStyle::State_Enabled) != 0;
 551
 552     painter.save();
 553
 554     QModelIndexList dirtyIndexes = d->intersectionSet(area);
 555     foreach (const QModelIndex &index, dirtyIndexes)
 556     {
 557         option.state = state;
 558         option.rect = d->visualRect(index);
 559
 560         if (selectionModel() && selectionModel()->isSelected(index))
 561         {
 562             option.state |= QStyle::State_Selected;
 563         }
 564
 565         if (enabled)
 566         {
 567             QPalette::ColorGroup cg;
 568             if ((d->proxyModel->flags(index) & Qt::ItemIsEnabled) == 0)
 569             {
 570                 option.state &= ~QStyle::State_Enabled;
 571                 cg = QPalette::Disabled;
 572             }
 573             else
 574             {
 575                 cg = QPalette::Normal;
 576             }
 577             option.palette.setCurrentColorGroup(cg);
 578         }
 579
 580         if (focus && currentIndex() == index)
 581         {
 582             option.state |= QStyle::State_HasFocus;
 583             if (this->state() == EditingState)
 584                 option.state |= QStyle::State_Editing;
 585         }
 586
 587         if ((index == d->hovered) && !d->mouseButtonPressed)
 588             option.state |= QStyle::State_MouseOver;
 589         else
 590             option.state &= ~QStyle::State_MouseOver;
 591
 592         itemDelegate(index)->paint(&painter, option, index);
 593     }
 594
 595     // Redraw categories
 596     QStyleOptionViewItem otherOption;
 597     foreach (const QString &category, d->categories)
 598     {
 599         otherOption = option;
 600         otherOption.rect = d->categoryVisualRect(category);
 601
 602         if (otherOption.rect.intersects(area))
 603         {
 604             d->drawNewCategory(category, otherOption, &painter);
 605         }
 606     }
 607
 608     if (d->mouseButtonPressed)
 609     {
 610         QPoint start, end, initialPressPosition;
 611
 612         initialPressPosition = d->initialPressPosition;
 613
 614         initialPressPosition.setY(initialPressPosition.y() - verticalOffset());
 615         initialPressPosition.setX(initialPressPosition.x() - horizontalOffset());
 616
 617         if (d->initialPressPosition.x() > d->mousePosition.x() ||
 618             d->initialPressPosition.y() > d->mousePosition.y())
 619         {
 620             start = d->mousePosition;
 621             end = initialPressPosition;
 622         }
 623         else
 624         {
 625             start = initialPressPosition;
 626             end = d->mousePosition;
 627         }
 628
 629         QStyleOptionRubberBand yetAnotherOption;
 630         yetAnotherOption.initFrom(this);
 631         yetAnotherOption.shape = QRubberBand::Rectangle;
 632         yetAnotherOption.opaque = false;
 633         yetAnotherOption.rect = QRect(start, end).intersected(viewport()->rect().adjusted(-16, -16, 16, 16));
 634         painter.save();
 635         style()->drawControl(QStyle::CE_RubberBand, &yetAnotherOption, &painter);
 636         painter.restore();
 637     }
 638
 639     painter.restore();
 640 }
 641
 642 void KListView::resizeEvent(QResizeEvent *event)
 643 {
 644     QListView::resizeEvent(event);
 645
 646     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 647         !d->itemCategorizer)
 648     {
 649         return;
 650     }
 651
 652     // Clear the items positions cache
 653     d->elementsPosition.clear();
 654     d->categoriesPosition.clear();
 655
 656     d->updateScrollbars();
 657 }
 658
 659 void KListView::setSelection(const QRect &rect,
 660                              QItemSelectionModel::SelectionFlags flags)
 661 {
 662     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 663         !d->itemCategorizer)
 664     {
 665         QListView::setSelection(rect, flags);
 666         return;
 667     }
 668
 669     // FIXME: I have to rethink and rewrite this method (ereslibre)
 670
 671     QModelIndexList dirtyIndexes = d->intersectionSet(rect);
 672     foreach (const QModelIndex &index, dirtyIndexes)
 673     {
 674         if (!d->mouseButtonPressed && rect.intersects(visualRect(index)))
 675         {
 676             selectionModel()->select(index, flags);
 677         }
 678         else
 679         {
 680             selectionModel()->select(index, QItemSelectionModel::Select);
 681
 682             if (d->mouseButtonPressed)
 683                 d->tempSelected.append(index);
 684         }
 685     }
 686
 687     if (d->mouseButtonPressed)
 688     {
 689         foreach (const QModelIndex &index, selectionModel()->selectedIndexes())
 690         {
 691             if (!rect.intersects(visualRect(index)))
 692             {
 693                 selectionModel()->select(index, QItemSelectionModel::Deselect);
 694
 695                 if (d->mouseButtonPressed)
 696                 {
 697                     d->tempSelected.removeAll(index);
 698                 }
 699             }
 700         }
 701     }
 702 }
 703
 704 void KListView::mouseMoveEvent(QMouseEvent *event)
 705 {
 706     QListView::mouseMoveEvent(event);
 707
 708     d->mousePosition = event->pos();
 709
 710     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 711         !d->itemCategorizer)
 712     {
 713         return;
 714     }
 715
 716     event->accept();
 717
 718     viewport()->update();
 719 }
 720
 721 void KListView::mousePressEvent(QMouseEvent *event)
 722 {
 723     QListView::mousePressEvent(event);
 724
 725     d->tempSelected.clear();
 726
 727     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 728         !d->itemCategorizer)
 729     {
 730         return;
 731     }
 732
 733     event->accept();
 734
 735     if (event->button() == Qt::LeftButton)
 736     {
 737         d->mouseButtonPressed = true;
 738
 739         d->initialPressPosition = event->pos();
 740         d->initialPressPosition.setY(d->initialPressPosition.y() +
 741                                                               verticalOffset());
 742         d->initialPressPosition.setX(d->initialPressPosition.x() +
 743                                                             horizontalOffset());
 744     }
 745
 746     viewport()->update();
 747 }
 748
 749 void KListView::mouseReleaseEvent(QMouseEvent *event)
 750 {
 751     QListView::mouseReleaseEvent(event);
 752
 753     d->mouseButtonPressed = false;
 754
 755     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 756         !d->itemCategorizer)
 757     {
 758         return;
 759     }
 760
 761     event->accept();
 762
 763     // FIXME: I have to rethink and rewrite this method (ereslibre)
 764
 765     QPoint initialPressPosition = viewport()->mapFromGlobal(QCursor::pos());
 766     initialPressPosition.setY(initialPressPosition.y() + verticalOffset());
 767     initialPressPosition.setX(initialPressPosition.x() + horizontalOffset());
 768
 769     if (initialPressPosition == d->initialPressPosition)
 770     {
 771         foreach(const QString &category, d->categories)
 772         {
 773             if (d->categoryVisualRect(category).contains(event->pos()))
 774             {
 775                 QModelIndex index;
 776                 QItemSelectionModel::SelectionFlag flag;
 777                 foreach (const QModelIndex &mappedIndex,
 778                          d->categoriesIndexes[category])
 779                 {
 780                     index = d->proxyModel->mapFromSource(mappedIndex);
 781
 782                     if (selectionModel()->selectedIndexes().contains(index))
 783                     {
 784                         flag = QItemSelectionModel::Deselect;
 785                     }
 786                     else
 787                     {
 788                         flag = QItemSelectionModel::Select;
 789                     }
 790
 791                     selectionModel()->select(index, flag);
 792                 }
 793             }
 794         }
 795     }
 796
 797     viewport()->update();
 798 }
 799
 800 void KListView::leaveEvent(QEvent *event)
 801 {
 802     QListView::leaveEvent(event);
 803
 804     d->hovered = QModelIndex();
 805
 806     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 807         !d->itemCategorizer)
 808     {
 809         return;
 810     }
 811
 812     event->accept();
 813
 814     viewport()->update();
 815 }
 816
 817 void KListView::rowsInserted(const QModelIndex &parent,
 818                              int start,
 819                              int end)
 820 {
 821     QListView::rowsInserted(parent, start, end);
 822
 823     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 824         !d->itemCategorizer)
 825     {
 826         return;
 827     }
 828
 829     rowsInsertedArtifficial(parent, start, end);
 830 }
 831
 832 void KListView::rowsInsertedArtifficial(const QModelIndex &parent,
 833                                                 int start,
 834                                                 int end)
 835 {
 836     d->elementsInfo.clear();
 837     d->elementsPosition.clear();
 838     d->elementDictionary.clear();
 839     d->categoriesIndexes.clear();
 840     d->categoriesPosition.clear();
 841     d->categories.clear();
 842     d->intersectedIndexes.clear();
 843     d->sourceModelIndexList.clear();
 844     d->hovered = QModelIndex();
 845     d->mouseButtonPressed = false;
 846
 847     if (start > end || end < 0 || start < 0 || !d->proxyModel->rowCount())
 848     {
 849         return;
 850     }
 851
 852     // Add all elements mapped to the source model
 853     for (int k = 0; k < d->proxyModel->rowCount(); k++)
 854     {
 855         d->sourceModelIndexList <<
 856                          d->proxyModel->mapToSource(d->proxyModel->index(k, 0));
 857     }
 858
 859     // Sort them with the general purpose lessThan method
 860     LessThan generalLessThan(d->proxyModel,
 861                              LessThan::GeneralPurpose);
 862
 863     qStableSort(d->sourceModelIndexList.begin(), d->sourceModelIndexList.end(),
 864                 generalLessThan);
 865
 866     // Explore categories
 867     QString prevCategory =
 868                  d->itemCategorizer->categoryForItem(d->sourceModelIndexList[0],
 869                                                      d->proxyModel->sortRole());
 870     QString lastCategory = prevCategory;
 871     QModelIndexList modelIndexList;
 872     struct Private::ElementInfo elementInfo;
 873     foreach (const QModelIndex &index, d->sourceModelIndexList)
 874     {
 875         lastCategory = d->itemCategorizer->categoryForItem(index,
 876                                                      d->proxyModel->sortRole());
 877
 878         elementInfo.category = lastCategory;
 879
 880         if (prevCategory != lastCategory)
 881         {
 882             d->categoriesIndexes.insert(prevCategory, modelIndexList);
 883             d->categories << prevCategory;
 884             modelIndexList.clear();
 885         }
 886
 887         modelIndexList << index;
 888         prevCategory = lastCategory;
 889
 890         d->elementsInfo.insert(index, elementInfo);
 891     }
 892
 893     d->categoriesIndexes.insert(prevCategory, modelIndexList);
 894     d->categories << prevCategory;
 895
 896     // Sort items locally in their respective categories with the category
 897     // purpose lessThan
 898     LessThan categoryLessThan(d->proxyModel,
 899                               LessThan::CategoryPurpose);
 900
 901     foreach (const QString &key, d->categories)
 902     {
 903         QModelIndexList &indexList = d->categoriesIndexes[key];
 904
 905         qStableSort(indexList.begin(), indexList.end(), categoryLessThan);
 906     }
 907
 908     d->lastIndex = d->categoriesIndexes[d->categories[d->categories.count() - 1]][d->categoriesIndexes[d->categories[d->categories.count() - 1]].count() - 1];
 909
 910     // Finally, fill data information of items situation. This will help when
 911     // trying to compute an item place in the viewport
 912     int i = 0; // position relative to the category beginning
 913     int j = 0; // number of elements before current
 914     foreach (const QString &key, d->categories)
 915     {
 916         foreach (const QModelIndex &index, d->categoriesIndexes[key])
 917         {
 918             struct Private::ElementInfo &elementInfo = d->elementsInfo[index];
 919
 920             elementInfo.relativeOffsetToCategory = i;
 921
 922             d->elementDictionary.insert(d->proxyModel->index(j, 0),
 923                                         d->proxyModel->mapFromSource(index));
 924
 925             i++;
 926             j++;
 927         }
 928
 929         i = 0;
 930     }
 931
 932     d->updateScrollbars();
 933 }
 934
 935 void KListView::rowsRemoved(const QModelIndex &parent,
 936                             int start,
 937                             int end)
 938 {
 939     if (d->proxyModel)
 940     {
 941         // Force the view to update all elements
 942         rowsInsertedArtifficial(parent, start, end);
 943     }
 944 }
 945
 946 void KListView::updateGeometries()
 947 {
 948     if ((viewMode() == KListView::ListMode) || !d->proxyModel ||
 949         !d->itemCategorizer)
 950     {
 951         QListView::updateGeometries();
 952         return;
 953     }
 954
 955     // Avoid QListView::updateGeometries(), since it will try to set another
 956     // range to our scroll bars, what we don't want (ereslibre)
 957     QAbstractItemView::updateGeometries();
 958 }
 959
 960 void KListView::slotSortingRoleChanged()
 961 {
 962     if ((viewMode() == KListView::IconMode) && d->proxyModel &&
 963         d->itemCategorizer)
 964     {
 965         // Force the view to update all elements
 966         rowsInsertedArtifficial(QModelIndex(), 0, d->proxyModel->rowCount() - 1);
 967     }
 968 }
 969
 970 #include "klistview.moc"