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     , isDragging(false)
  83     , dragLeftViewport(false)
  84     , proxyModel(0)
  85     , lastIndex(QModelIndex())
  86 {
  87 }
  88
  89 KListView::Private::~Private()
  90 {
  91 }
  92
  93 const QModelIndexList &KListView::Private::intersectionSet(const QRect &rect)
  94 {
  95     QModelIndex index;
  96     QRect indexVisualRect;
  97
  98     intersectedIndexes.clear();
  99
 100     // Lets find out where we should start
 101     int top = proxyModel->rowCount() - 1;
 102     int bottom = 0;
 103     int middle = (top + bottom) / 2;
 104     while (bottom <= top)
 105     {
 106         middle = (top + bottom) / 2;
 107
 108         index = elementDictionary[proxyModel->index(middle, 0)];
 109         indexVisualRect = visualRect(index);
 110
 111         if (qMax(indexVisualRect.topLeft().y(),
 112                  indexVisualRect.bottomRight().y()) < qMin(rect.topLeft().y(),
 113                                                         rect.bottomRight().y()))
 114         {
 115             bottom = middle + 1;
 116         }
 117         else
 118         {
 119             top = middle - 1;
 120         }
 121     }
 122
 123     for (int i = middle; i < proxyModel->rowCount(); i++)
 124     {
 125         index = elementDictionary[proxyModel->index(i, 0)];
 126         indexVisualRect = visualRect(index);
 127
 128         if (rect.intersects(indexVisualRect))
 129             intersectedIndexes.append(index);
 130
 131         // If we passed next item, stop searching for hits
 132         if (qMax(rect.bottomRight().y(), rect.topLeft().y()) <
 133                                                   qMin(indexVisualRect.topLeft().y(),
 134                                                        indexVisualRect.bottomRight().y()))
 135             break;
 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 ((category == hoveredCategory) && !mouseButtonPressed)
 335     {
 336         const QPalette::ColorGroup group =
 337                                           option.state & QStyle::State_Enabled ?
 338                                           QPalette::Normal : QPalette::Disabled;
 339
 340         QLinearGradient gradient(option.rect.topLeft(),
 341                                  option.rect.bottomRight());
 342         gradient.setColorAt(0,
 343                             option.palette.color(group,
 344                                                  QPalette::Highlight).light());
 345         gradient.setColorAt(1, Qt::transparent);
 346
 347         painter->fillRect(option.rect, gradient);
 348     }
 349
 350     /*if (const KStyle *style = dynamic_cast<const KStyle*>(QApplication::style()))
 351         {
 352         style->drawControl(KStyle::CE_Category, &opt, painter, this);
 353         }
 354     else
 355     {*/
 356         QFont painterFont = painter->font();
 357         painterFont.setWeight(QFont::Bold);
 358         QFontMetrics metrics(painterFont);
 359         painter->setFont(painterFont);
 360
 361         QPainterPath path;
 362         path.addRect(option.rect.left(),
 363                      option.rect.bottom() - 2,
 364                      option.rect.width(),
 365                      2);
 366
 367         QLinearGradient gradient(option.rect.topLeft(),
 368                                  option.rect.bottomRight());
 369         gradient.setColorAt(0, color);
 370         gradient.setColorAt(1, Qt::transparent);
 371
 372         painter->setBrush(gradient);
 373         painter->fillPath(path, gradient);
 374
 375         painter->setPen(color);
 376
 377         painter->drawText(option.rect, Qt::AlignVCenter | Qt::AlignLeft,
 378              metrics.elidedText(category, Qt::ElideRight, option.rect.width()));
 379     //}
 380     painter->restore();
 381 }
 382
 383
 384 void KListView::Private::updateScrollbars()
 385 {
 386     int lastItemBottom = cachedRectIndex(lastIndex).bottom() +
 387                            listView->spacing() - listView->viewport()->height();
 388
 389     listView->verticalScrollBar()->setSingleStep(listView->viewport()->height() / 10);
 390     listView->verticalScrollBar()->setPageStep(listView->viewport()->height());
 391     listView->verticalScrollBar()->setRange(0, lastItemBottom);
 392 }
 393
 394 void KListView::Private::drawDraggedItems(QPainter *painter)
 395 {
 396     QStyleOptionViewItemV3 option = listView->viewOptions();
 397     option.state &= ~QStyle::State_MouseOver;
 398     int dx;
 399     int dy;
 400     foreach (const QModelIndex &index, listView->selectionModel()->selectedIndexes())
 401     {
 402         dx = mousePosition.x() - initialPressPosition.x() + listView->horizontalOffset();
 403         dy = mousePosition.y() - initialPressPosition.y() + listView->verticalOffset();
 404
 405         option.rect = visualRect(index);
 406         option.rect.adjust(dx, dy, dx, dy);
 407
 408         listView->itemDelegate(index)->paint(painter, option, index);
 409     }
 410 }
 411
 412
 413 //==============================================================================
 414
 415
 416 KListView::KListView(QWidget *parent)
 417     : QListView(parent)
 418     , d(new Private(this))
 419 {
 420 }
 421
 422 KListView::~KListView()
 423 {
 424     delete d;
 425 }
 426
 427 void KListView::setModel(QAbstractItemModel *model)
 428 {
 429     if (d->proxyModel)
 430     {
 431         QObject::disconnect(d->proxyModel,
 432                             SIGNAL(rowsRemoved(QModelIndex,int,int)),
 433                             this, SLOT(rowsRemoved(QModelIndex,int,int)));
 434
 435         QObject::disconnect(d->proxyModel,
 436                             SIGNAL(sortingRoleChanged()),
 437                             this, SLOT(slotSortingRoleChanged()));
 438     }
 439
 440     QListView::setModel(model);
 441
 442     d->proxyModel = dynamic_cast<KSortFilterProxyModel*>(model);
 443
 444     if (d->proxyModel)
 445     {
 446         QObject::connect(d->proxyModel,
 447                          SIGNAL(rowsRemoved(QModelIndex,int,int)),
 448                          this, SLOT(rowsRemoved(QModelIndex,int,int)));
 449
 450         QObject::connect(d->proxyModel,
 451                          SIGNAL(sortingRoleChanged()),
 452                          this, SLOT(slotSortingRoleChanged()));
 453     }
 454 }
 455
 456 QRect KListView::visualRect(const QModelIndex &index) const
 457 {
 458     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 459         !d->itemCategorizer)
 460     {
 461         return QListView::visualRect(index);
 462     }
 463
 464     if (!qobject_cast<const QSortFilterProxyModel*>(index.model()))
 465     {
 466         return d->visualRect(d->proxyModel->mapFromSource(index));
 467     }
 468
 469     return d->visualRect(index);
 470 }
 471
 472 KItemCategorizer *KListView::itemCategorizer() const
 473 {
 474     return d->itemCategorizer;
 475 }
 476
 477 void KListView::setItemCategorizer(KItemCategorizer *itemCategorizer)
 478 {
 479     if (!itemCategorizer && d->proxyModel)
 480     {
 481         QObject::disconnect(d->proxyModel,
 482                             SIGNAL(rowsRemoved(QModelIndex,int,int)),
 483                             this, SLOT(rowsRemoved(QModelIndex,int,int)));
 484
 485         QObject::disconnect(d->proxyModel,
 486                             SIGNAL(sortingRoleChanged()),
 487                             this, SLOT(slotSortingRoleChanged()));
 488     }
 489     else if (itemCategorizer && d->proxyModel)
 490     {
 491         QObject::connect(d->proxyModel,
 492                          SIGNAL(rowsRemoved(QModelIndex,int,int)),
 493                          this, SLOT(rowsRemoved(QModelIndex,int,int)));
 494
 495         QObject::connect(d->proxyModel,
 496                          SIGNAL(sortingRoleChanged()),
 497                          this, SLOT(slotSortingRoleChanged()));
 498     }
 499
 500     d->itemCategorizer = itemCategorizer;
 501
 502     if (itemCategorizer)
 503     {
 504         rowsInserted(QModelIndex(), 0, d->proxyModel->rowCount() - 1);
 505     }
 506     else
 507     {
 508         updateGeometries();
 509     }
 510 }
 511
 512 QModelIndex KListView::indexAt(const QPoint &point) const
 513 {
 514     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 515         !d->itemCategorizer)
 516     {
 517         return QListView::indexAt(point);
 518     }
 519
 520     QModelIndex index;
 521
 522     QModelIndexList item = d->intersectionSet(QRect(point, point));
 523
 524     if (item.count() == 1)
 525     {
 526         index = item[0];
 527     }
 528
 529     d->hovered = index;
 530
 531     return index;
 532 }
 533
 534 void KListView::reset()
 535 {
 536     QListView::reset();
 537
 538     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 539         !d->itemCategorizer)
 540     {
 541         return;
 542     }
 543
 544     d->elementsInfo.clear();
 545     d->elementsPosition.clear();
 546     d->elementDictionary.clear();
 547     d->categoriesIndexes.clear();
 548     d->categoriesPosition.clear();
 549     d->categories.clear();
 550     d->intersectedIndexes.clear();
 551     d->sourceModelIndexList.clear();
 552     d->hovered = QModelIndex();
 553     d->mouseButtonPressed = false;
 554 }
 555
 556 void KListView::paintEvent(QPaintEvent *event)
 557 {
 558     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 559         !d->itemCategorizer)
 560     {
 561         QListView::paintEvent(event);
 562         return;
 563     }
 564
 565     QStyleOptionViewItemV3 option = viewOptions();
 566     QPainter painter(viewport());
 567     QRect area = event->rect();
 568     const bool focus = (hasFocus() || viewport()->hasFocus()) &&
 569                         currentIndex().isValid();
 570     const QStyle::State state = option.state;
 571     const bool enabled = (state & QStyle::State_Enabled) != 0;
 572
 573     painter.save();
 574
 575     QModelIndexList dirtyIndexes = d->intersectionSet(area);
 576     foreach (const QModelIndex &index, dirtyIndexes)
 577     {
 578         option.state = state;
 579         option.rect = d->visualRect(index);
 580
 581         if (selectionModel() && selectionModel()->isSelected(index))
 582         {
 583             option.state |= QStyle::State_Selected;
 584         }
 585
 586         if (enabled)
 587         {
 588             QPalette::ColorGroup cg;
 589             if ((d->proxyModel->flags(index) & Qt::ItemIsEnabled) == 0)
 590             {
 591                 option.state &= ~QStyle::State_Enabled;
 592                 cg = QPalette::Disabled;
 593             }
 594             else
 595             {
 596                 cg = QPalette::Normal;
 597             }
 598             option.palette.setCurrentColorGroup(cg);
 599         }
 600
 601         if (focus && currentIndex() == index)
 602         {
 603             option.state |= QStyle::State_HasFocus;
 604             if (this->state() == EditingState)
 605                 option.state |= QStyle::State_Editing;
 606         }
 607
 608         if ((index == d->hovered) && !d->mouseButtonPressed)
 609             option.state |= QStyle::State_MouseOver;
 610         else
 611             option.state &= ~QStyle::State_MouseOver;
 612
 613         itemDelegate(index)->paint(&painter, option, index);
 614     }
 615
 616     // Redraw categories
 617     QStyleOptionViewItem otherOption;
 618     foreach (const QString &category, d->categories)
 619     {
 620         otherOption = option;
 621         otherOption.rect = d->categoryVisualRect(category);
 622
 623         if (otherOption.rect.intersects(area))
 624         {
 625             d->drawNewCategory(category, otherOption, &painter);
 626         }
 627     }
 628
 629     if (d->mouseButtonPressed && !d->isDragging)
 630     {
 631         QPoint start, end, initialPressPosition;
 632
 633         initialPressPosition = d->initialPressPosition;
 634
 635         initialPressPosition.setY(initialPressPosition.y() - verticalOffset());
 636         initialPressPosition.setX(initialPressPosition.x() - horizontalOffset());
 637
 638         if (d->initialPressPosition.x() > d->mousePosition.x() ||
 639             d->initialPressPosition.y() > d->mousePosition.y())
 640         {
 641             start = d->mousePosition;
 642             end = initialPressPosition;
 643         }
 644         else
 645         {
 646             start = initialPressPosition;
 647             end = d->mousePosition;
 648         }
 649
 650         QStyleOptionRubberBand yetAnotherOption;
 651         yetAnotherOption.initFrom(this);
 652         yetAnotherOption.shape = QRubberBand::Rectangle;
 653         yetAnotherOption.opaque = false;
 654         yetAnotherOption.rect = QRect(start, end).intersected(viewport()->rect().adjusted(-16, -16, 16, 16));
 655         painter.save();
 656         style()->drawControl(QStyle::CE_RubberBand, &yetAnotherOption, &painter);
 657         painter.restore();
 658     }
 659
 660     if (d->isDragging && !d->dragLeftViewport)
 661     {
 662         painter.setOpacity(0.5);
 663         d->drawDraggedItems(&painter);
 664     }
 665
 666     painter.restore();
 667 }
 668
 669 void KListView::resizeEvent(QResizeEvent *event)
 670 {
 671     QListView::resizeEvent(event);
 672
 673     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 674         !d->itemCategorizer)
 675     {
 676         return;
 677     }
 678
 679     // Clear the items positions cache
 680     d->elementsPosition.clear();
 681     d->categoriesPosition.clear();
 682
 683     d->updateScrollbars();
 684 }
 685
 686 void KListView::setSelection(const QRect &rect,
 687                              QItemSelectionModel::SelectionFlags flags)
 688 {
 689     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 690         !d->itemCategorizer)
 691     {
 692         QListView::setSelection(rect, flags);
 693         return;
 694     }
 695
 696     if (!flags)
 697         return;
 698
 699     selectionModel()->clear();
 700
 701     if (flags & QItemSelectionModel::Clear)
 702     {
 703         d->lastSelection = QItemSelection();
 704     }
 705
 706     QModelIndexList dirtyIndexes = d->intersectionSet(rect);
 707     QItemSelection selection;
 708
 709     if (!dirtyIndexes.count())
 710     {
 711         if (d->lastSelection.count())
 712         {
 713             selectionModel()->select(d->lastSelection, flags);
 714         }
 715
 716         return;
 717     }
 718
 719     if (!d->mouseButtonPressed)
 720     {
 721         selection = QItemSelection(dirtyIndexes[0], dirtyIndexes[0]);
 722     }
 723     else
 724     {
 725         QModelIndex first = dirtyIndexes[0];
 726         QModelIndex last;
 727         foreach (const QModelIndex &index, dirtyIndexes)
 728         {
 729             if (last.isValid() && last.row() + 1 != index.row())
 730             {
 731                 QItemSelectionRange range(first, last);
 732
 733                 selection << range;
 734
 735                 first = index;
 736             }
 737
 738             last = index;
 739         }
 740
 741         if (last.isValid())
 742             selection << QItemSelectionRange(first, last);
 743     }
 744
 745     if (d->lastSelection.count() && !d->mouseButtonPressed)
 746     {
 747         selection.merge(d->lastSelection, flags);
 748     }
 749     else if (d->lastSelection.count())
 750     {
 751         selection.merge(d->lastSelection, QItemSelectionModel::Select);
 752     }
 753
 754     selectionModel()->select(selection, flags);
 755 }
 756
 757 void KListView::mouseMoveEvent(QMouseEvent *event)
 758 {
 759     QListView::mouseMoveEvent(event);
 760
 761     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 762         !d->itemCategorizer)
 763     {
 764         return;
 765     }
 766
 767     d->mousePosition = event->pos();
 768     d->hoveredCategory = QString();
 769
 770     // Redraw categories
 771     foreach (const QString &category, d->categories)
 772     {
 773         if (d->categoryVisualRect(category).intersects(QRect(event->pos(), event->pos())))
 774         {
 775             d->hoveredCategory = category;
 776         }
 777
 778         viewport()->update(d->categoryVisualRect(category));
 779     }
 780 }
 781
 782 void KListView::mousePressEvent(QMouseEvent *event)
 783 {
 784     QListView::mousePressEvent(event);
 785
 786     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 787         !d->itemCategorizer)
 788     {
 789         return;
 790     }
 791
 792     d->dragLeftViewport = false;
 793
 794     if (event->button() == Qt::LeftButton)
 795     {
 796         d->mouseButtonPressed = true;
 797
 798         d->initialPressPosition = event->pos();
 799         d->initialPressPosition.setY(d->initialPressPosition.y() +
 800                                                               verticalOffset());
 801         d->initialPressPosition.setX(d->initialPressPosition.x() +
 802                                                             horizontalOffset());
 803     }
 804 }
 805
 806 void KListView::mouseReleaseEvent(QMouseEvent *event)
 807 {
 808     QListView::mouseReleaseEvent(event);
 809
 810     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 811         !d->itemCategorizer)
 812     {
 813         return;
 814     }
 815
 816     d->mouseButtonPressed = false;
 817
 818     QPoint initialPressPosition = viewport()->mapFromGlobal(QCursor::pos());
 819     initialPressPosition.setY(initialPressPosition.y() + verticalOffset());
 820     initialPressPosition.setX(initialPressPosition.x() + horizontalOffset());
 821
 822     QItemSelection selection;
 823
 824     if (initialPressPosition == d->initialPressPosition)
 825     {
 826         foreach(const QString &category, d->categories)
 827         {
 828             if (d->categoryVisualRect(category).contains(event->pos()))
 829             {
 830                 QItemSelectionRange selectionRange(d->proxyModel->mapFromSource(d->categoriesIndexes[category][0]),
 831                                                    d->proxyModel->mapFromSource(d->categoriesIndexes[category][d->categoriesIndexes[category].count() - 1]));
 832
 833                 selection << selectionRange;
 834
 835                 selectionModel()->select(selection, QItemSelectionModel::Select);
 836
 837                 break;
 838             }
 839         }
 840     }
 841
 842     d->lastSelection = selectionModel()->selection();
 843
 844     if (d->hovered.isValid())
 845         viewport()->update(d->visualRect(d->hovered));
 846     else if (!d->hoveredCategory.isEmpty())
 847         viewport()->update(d->categoryVisualRect(d->hoveredCategory));
 848 }
 849
 850 void KListView::leaveEvent(QEvent *event)
 851 {
 852     QListView::leaveEvent(event);
 853
 854     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 855         !d->itemCategorizer)
 856     {
 857         return;
 858     }
 859
 860     d->hovered = QModelIndex();
 861     d->hoveredCategory = QString();
 862 }
 863
 864 void KListView::startDrag(Qt::DropActions supportedActions)
 865 {
 866     QListView::startDrag(supportedActions);
 867
 868     d->isDragging = false;
 869     d->mouseButtonPressed = false;
 870 }
 871
 872 void KListView::dragMoveEvent(QDragMoveEvent *event)
 873 {
 874     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 875         !d->itemCategorizer)
 876     {
 877         QListView::dragMoveEvent(event);
 878         return;
 879     }
 880
 881     d->mousePosition = event->pos();
 882
 883     if (d->mouseButtonPressed)
 884     {
 885         d->isDragging = true;
 886     }
 887     else
 888     {
 889         d->isDragging = false;
 890     }
 891
 892     d->dragLeftViewport = false;
 893 }
 894
 895 void KListView::dragLeaveEvent(QDragLeaveEvent *event)
 896 {
 897     QListView::dragLeaveEvent(event);
 898
 899     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 900         !d->itemCategorizer)
 901     {
 902         return;
 903     }
 904
 905     d->dragLeftViewport = true;
 906 }
 907
 908 QModelIndex KListView::moveCursor(CursorAction cursorAction,
 909                                   Qt::KeyboardModifiers modifiers)
 910 {
 911     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 912         !d->itemCategorizer)
 913     {
 914         return QListView::moveCursor(cursorAction, modifiers);
 915     }
 916
 917     return QListView::moveCursor(cursorAction, modifiers);
 918 }
 919
 920 void KListView::rowsInserted(const QModelIndex &parent,
 921                              int start,
 922                              int end)
 923 {
 924     QListView::rowsInserted(parent, start, end);
 925
 926     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
 927         !d->itemCategorizer)
 928     {
 929         return;
 930     }
 931
 932     rowsInsertedArtifficial(parent, start, end);
 933 }
 934
 935 void KListView::rowsInsertedArtifficial(const QModelIndex &parent,
 936                                         int start,
 937                                         int end)
 938 {
 939     d->lastSelection = QItemSelection();
 940     d->elementsInfo.clear();
 941     d->elementsPosition.clear();
 942     d->elementDictionary.clear();
 943     d->categoriesIndexes.clear();
 944     d->categoriesPosition.clear();
 945     d->categories.clear();
 946     d->intersectedIndexes.clear();
 947     d->sourceModelIndexList.clear();
 948     d->hovered = QModelIndex();
 949     d->mouseButtonPressed = false;
 950
 951     if (start > end || end < 0 || start < 0 || !d->proxyModel->rowCount())
 952     {
 953         return;
 954     }
 955
 956     // Add all elements mapped to the source model
 957     for (int k = 0; k < d->proxyModel->rowCount(); k++)
 958     {
 959         d->sourceModelIndexList <<
 960                          d->proxyModel->mapToSource(d->proxyModel->index(k, 0));
 961     }
 962
 963     // Sort them with the general purpose lessThan method
 964     LessThan generalLessThan(d->proxyModel,
 965                              LessThan::GeneralPurpose);
 966
 967     qStableSort(d->sourceModelIndexList.begin(), d->sourceModelIndexList.end(),
 968                 generalLessThan);
 969
 970     // Explore categories
 971     QString prevCategory =
 972                  d->itemCategorizer->categoryForItem(d->sourceModelIndexList[0],
 973                                                      d->proxyModel->sortRole());
 974     QString lastCategory = prevCategory;
 975     QModelIndexList modelIndexList;
 976     struct Private::ElementInfo elementInfo;
 977     foreach (const QModelIndex &index, d->sourceModelIndexList)
 978     {
 979         lastCategory = d->itemCategorizer->categoryForItem(index,
 980                                                      d->proxyModel->sortRole());
 981
 982         elementInfo.category = lastCategory;
 983
 984         if (prevCategory != lastCategory)
 985         {
 986             d->categoriesIndexes.insert(prevCategory, modelIndexList);
 987             d->categories << prevCategory;
 988             modelIndexList.clear();
 989         }
 990
 991         modelIndexList << index;
 992         prevCategory = lastCategory;
 993
 994         d->elementsInfo.insert(index, elementInfo);
 995     }
 996
 997     d->categoriesIndexes.insert(prevCategory, modelIndexList);
 998     d->categories << prevCategory;
 999
1000     // Sort items locally in their respective categories with the category
1001     // purpose lessThan
1002     LessThan categoryLessThan(d->proxyModel,
1003                               LessThan::CategoryPurpose);
1004
1005     foreach (const QString &key, d->categories)
1006     {
1007         QModelIndexList &indexList = d->categoriesIndexes[key];
1008
1009         qStableSort(indexList.begin(), indexList.end(), categoryLessThan);
1010     }
1011
1012     d->lastIndex = d->categoriesIndexes[d->categories[d->categories.count() - 1]][d->categoriesIndexes[d->categories[d->categories.count() - 1]].count() - 1];
1013
1014     // Finally, fill data information of items situation. This will help when
1015     // trying to compute an item place in the viewport
1016     int i = 0; // position relative to the category beginning
1017     int j = 0; // number of elements before current
1018     foreach (const QString &key, d->categories)
1019     {
1020         foreach (const QModelIndex &index, d->categoriesIndexes[key])
1021         {
1022             struct Private::ElementInfo &elementInfo = d->elementsInfo[index];
1023
1024             elementInfo.relativeOffsetToCategory = i;
1025
1026             d->elementDictionary.insert(d->proxyModel->index(j, 0),
1027                                         d->proxyModel->mapFromSource(index));
1028
1029             i++;
1030             j++;
1031         }
1032
1033         i = 0;
1034     }
1035
1036     d->updateScrollbars();
1037 }
1038
1039 void KListView::rowsRemoved(const QModelIndex &parent,
1040                             int start,
1041                             int end)
1042 {
1043     if ((viewMode() == KListView::IconMode) && d->proxyModel &&
1044         d->itemCategorizer)
1045     {
1046         // Force the view to update all elements
1047         rowsInsertedArtifficial(parent, start, end);
1048     }
1049 }
1050
1051 void KListView::updateGeometries()
1052 {
1053     if ((viewMode() != KListView::IconMode) || !d->proxyModel ||
1054         !d->itemCategorizer)
1055     {
1056         QListView::updateGeometries();
1057         return;
1058     }
1059
1060     // Avoid QListView::updateGeometries(), since it will try to set another
1061     // range to our scroll bars, what we don't want (ereslibre)
1062     QAbstractItemView::updateGeometries();
1063 }
1064
1065 void KListView::slotSortingRoleChanged()
1066 {
1067     if ((viewMode() == KListView::IconMode) && d->proxyModel &&
1068         d->itemCategorizer)
1069     {
1070         // Force the view to update all elements
1071         rowsInsertedArtifficial(QModelIndex(), 0, d->proxyModel->rowCount() - 1);
1072     }
1073 }
1074
1075 #include "klistview.moc"