src/kitemviews/kitemlistview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   Based on the Itemviews NG project from Trolltech Labs:                *
   5  *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program; if not, write to the                         *
  19  *   Free Software Foundation, Inc.,                                       *
  20  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  21  ***************************************************************************/
  22
  23 #include "kitemlistview.h"
  24
  25 #include "kitemlistcontroller.h"
  26 #include "kitemlistheader_p.h"
  27 #include "kitemlistrubberband_p.h"
  28 #include "kitemlistselectionmanager.h"
  29 #include "kitemlistsizehintresolver_p.h"
  30 #include "kitemlistviewlayouter_p.h"
  31 #include "kitemlistviewanimation_p.h"
  32 #include "kitemlistwidget.h"
  33
  34 #include <KDebug>
  35
  36 #include <QCursor>
  37 #include <QGraphicsSceneMouseEvent>
  38 #include <QPainter>
  39 #include <QPropertyAnimation>
  40 #include <QStyle>
  41 #include <QStyleOptionRubberBand>
  42 #include <QTimer>
  43
  44 namespace {
  45     // Time in ms until reaching the autoscroll margin triggers
  46     // an initial autoscrolling
  47     const int InitialAutoScrollDelay = 700;
  48
  49     // Delay in ms for triggering the next autoscroll
  50     const int RepeatingAutoScrollDelay = 1000 / 60;
  51 }
  52
  53 KItemListView::KItemListView(QGraphicsWidget* parent) :
  54     QGraphicsWidget(parent),
  55     m_enabledSelectionToggles(false),
  56     m_grouped(false),
  57     m_activeTransactions(0),
  58     m_itemSize(),
  59     m_controller(0),
  60     m_model(0),
  61     m_visibleRoles(),
  62     m_visibleRolesSizes(),
  63     m_stretchedVisibleRolesSizes(),
  64     m_widgetCreator(0),
  65     m_groupHeaderCreator(0),
  66     m_styleOption(),
  67     m_visibleItems(),
  68     m_visibleGroups(),
  69     m_sizeHintResolver(0),
  70     m_layouter(0),
  71     m_animation(0),
  72     m_layoutTimer(0),
  73     m_oldScrollOffset(0),
  74     m_oldMaximumScrollOffset(0),
  75     m_oldItemOffset(0),
  76     m_oldMaximumItemOffset(0),
  77     m_skipAutoScrollForRubberBand(false),
  78     m_rubberBand(0),
  79     m_mousePos(),
  80     m_autoScrollIncrement(0),
  81     m_autoScrollTimer(0),
  82     m_header(0),
  83     m_useHeaderWidths(false)
  84 {
  85     setAcceptHoverEvents(true);
  86
  87     m_sizeHintResolver = new KItemListSizeHintResolver(this);
  88
  89     m_layouter = new KItemListViewLayouter(this);
  90     m_layouter->setSizeHintResolver(m_sizeHintResolver);
  91
  92     m_animation = new KItemListViewAnimation(this);
  93     connect(m_animation, SIGNAL(finished(QGraphicsWidget*,KItemListViewAnimation::AnimationType)),
  94             this, SLOT(slotAnimationFinished(QGraphicsWidget*,KItemListViewAnimation::AnimationType)));
  95
  96     m_layoutTimer = new QTimer(this);
  97     m_layoutTimer->setInterval(300);
  98     m_layoutTimer->setSingleShot(true);
  99     connect(m_layoutTimer, SIGNAL(timeout()), this, SLOT(slotLayoutTimerFinished()));
 100
 101     m_rubberBand = new KItemListRubberBand(this);
 102     connect(m_rubberBand, SIGNAL(activationChanged(bool)), this, SLOT(slotRubberBandActivationChanged(bool)));
 103 }
 104
 105 KItemListView::~KItemListView()
 106 {
 107     delete m_sizeHintResolver;
 108     m_sizeHintResolver = 0;
 109 }
 110
 111 void KItemListView::setScrollOrientation(Qt::Orientation orientation)
 112 {
 113     const Qt::Orientation previousOrientation = m_layouter->scrollOrientation();
 114     if (orientation == previousOrientation) {
 115         return;
 116     }
 117
 118     m_layouter->setScrollOrientation(orientation);
 119     m_animation->setScrollOrientation(orientation);
 120     m_sizeHintResolver->clearCache();
 121
 122     if (m_grouped) {
 123         QMutableHashIterator<KItemListWidget*, KItemListGroupHeader*> it (m_visibleGroups);
 124         while (it.hasNext()) {
 125             it.next();
 126             it.value()->setScrollOrientation(orientation);
 127         }
 128     }
 129
 130     doLayout(Animation);
 131
 132     onScrollOrientationChanged(orientation, previousOrientation);
 133     emit scrollOrientationChanged(orientation, previousOrientation);
 134 }
 135
 136 Qt::Orientation KItemListView::scrollOrientation() const
 137 {
 138     return m_layouter->scrollOrientation();
 139 }
 140
 141 void KItemListView::setItemSize(const QSizeF& itemSize)
 142 {
 143     const QSizeF previousSize = m_itemSize;
 144     if (itemSize == previousSize) {
 145         return;
 146     }
 147
 148     m_itemSize = itemSize;
 149
 150     const bool emptySize = itemSize.isEmpty();
 151     if (emptySize) {
 152         updateVisibleRolesSizes();
 153     } else {
 154         if (itemSize.width() < previousSize.width() || itemSize.height() < previousSize.height()) {
 155             prepareLayoutForIncreasedItemCount(itemSize, ItemSize);
 156         } else {
 157             m_layouter->setItemSize(itemSize);
 158         }
 159     }
 160
 161     m_sizeHintResolver->clearCache();
 162     doLayout(Animation);
 163     onItemSizeChanged(itemSize, previousSize);
 164 }
 165
 166 QSizeF KItemListView::itemSize() const
 167 {
 168     return m_itemSize;
 169 }
 170
 171 void KItemListView::setScrollOffset(qreal offset)
 172 {
 173     if (offset < 0) {
 174         offset = 0;
 175     }
 176
 177     const qreal previousOffset = m_layouter->scrollOffset();
 178     if (offset == previousOffset) {
 179         return;
 180     }
 181
 182     m_layouter->setScrollOffset(offset);
 183     m_animation->setScrollOffset(offset);
 184
 185     // Don't check whether the m_layoutTimer is active: Changing the
 186     // scroll offset must always trigger a synchronous layout, otherwise
 187     // the smooth-scrolling might get jerky.
 188     doLayout(NoAnimation);
 189     onScrollOffsetChanged(offset, previousOffset);
 190 }
 191
 192 qreal KItemListView::scrollOffset() const
 193 {
 194     return m_layouter->scrollOffset();
 195 }
 196
 197 qreal KItemListView::maximumScrollOffset() const
 198 {
 199     return m_layouter->maximumScrollOffset();
 200 }
 201
 202 void KItemListView::setItemOffset(qreal offset)
 203 {
 204     if (m_layouter->itemOffset() == offset) {
 205         return;
 206     }
 207
 208     m_layouter->setItemOffset(offset);
 209     if (m_header) {
 210         m_header->setPos(-offset, 0);
 211     }
 212
 213     // Don't check whether the m_layoutTimer is active: Changing the
 214     // item offset must always trigger a synchronous layout, otherwise
 215     // the smooth-scrolling might get jerky.
 216     doLayout(NoAnimation);
 217 }
 218
 219 qreal KItemListView::itemOffset() const
 220 {
 221     return m_layouter->itemOffset();
 222 }
 223
 224 qreal KItemListView::maximumItemOffset() const
 225 {
 226     return m_layouter->maximumItemOffset();
 227 }
 228
 229 void KItemListView::setVisibleRoles(const QList<QByteArray>& roles)
 230 {
 231     const QList<QByteArray> previousRoles = m_visibleRoles;
 232     m_visibleRoles = roles;
 233
 234     QHashIterator<int, KItemListWidget*> it(m_visibleItems);
 235     while (it.hasNext()) {
 236         it.next();
 237         KItemListWidget* widget = it.value();
 238         widget->setVisibleRoles(roles);
 239         widget->setVisibleRolesSizes(m_stretchedVisibleRolesSizes);
 240     }
 241
 242     m_sizeHintResolver->clearCache();
 243     m_layouter->markAsDirty();
 244
 245     if (m_header) {
 246         m_header->setVisibleRoles(roles);
 247         m_header->setVisibleRolesWidths(headerRolesWidths());
 248         m_useHeaderWidths = false;
 249     }
 250
 251     updateVisibleRolesSizes();
 252     doLayout(Animation);
 253
 254     onVisibleRolesChanged(roles, previousRoles);
 255 }
 256
 257 QList<QByteArray> KItemListView::visibleRoles() const
 258 {
 259     return m_visibleRoles;
 260 }
 261
 262 void KItemListView::setAutoScroll(bool enabled)
 263 {
 264     if (enabled && !m_autoScrollTimer) {
 265         m_autoScrollTimer = new QTimer(this);
 266         m_autoScrollTimer->setSingleShot(false);
 267         connect(m_autoScrollTimer, SIGNAL(timeout()), this, SLOT(triggerAutoScrolling()));
 268         m_autoScrollTimer->start(InitialAutoScrollDelay);
 269     } else if (!enabled && m_autoScrollTimer) {
 270         delete m_autoScrollTimer;
 271         m_autoScrollTimer = 0;
 272     }
 273
 274 }
 275
 276 bool KItemListView::autoScroll() const
 277 {
 278     return m_autoScrollTimer != 0;
 279 }
 280
 281 void KItemListView::setEnabledSelectionToggles(bool enabled)
 282 {
 283     if (m_enabledSelectionToggles != enabled) {
 284         m_enabledSelectionToggles = enabled;
 285
 286         QHashIterator<int, KItemListWidget*> it(m_visibleItems);
 287         while (it.hasNext()) {
 288             it.next();
 289             it.value()->setEnabledSelectionToggle(enabled);
 290         }
 291     }
 292 }
 293
 294 bool KItemListView::enabledSelectionToggles() const
 295 {
 296     return m_enabledSelectionToggles;
 297 }
 298
 299 KItemListController* KItemListView::controller() const
 300 {
 301     return m_controller;
 302 }
 303
 304 KItemModelBase* KItemListView::model() const
 305 {
 306     return m_model;
 307 }
 308
 309 void KItemListView::setWidgetCreator(KItemListWidgetCreatorBase* widgetCreator)
 310 {
 311     m_widgetCreator = widgetCreator;
 312 }
 313
 314 KItemListWidgetCreatorBase* KItemListView::widgetCreator() const
 315 {
 316     return m_widgetCreator;
 317 }
 318
 319 void KItemListView::setGroupHeaderCreator(KItemListGroupHeaderCreatorBase* groupHeaderCreator)
 320 {
 321     m_groupHeaderCreator = groupHeaderCreator;
 322 }
 323
 324 KItemListGroupHeaderCreatorBase* KItemListView::groupHeaderCreator() const
 325 {
 326     return m_groupHeaderCreator;
 327 }
 328
 329 void KItemListView::setStyleOption(const KItemListStyleOption& option)
 330 {
 331     const KItemListStyleOption previousOption = m_styleOption;
 332     m_styleOption = option;
 333
 334     QHashIterator<int, KItemListWidget*> it(m_visibleItems);
 335     while (it.hasNext()) {
 336         it.next();
 337         it.value()->setStyleOption(option);
 338     }
 339
 340     m_sizeHintResolver->clearCache();
 341     doLayout(Animation);
 342     onStyleOptionChanged(option, previousOption);
 343 }
 344
 345 const KItemListStyleOption& KItemListView::styleOption() const
 346 {
 347     return m_styleOption;
 348 }
 349
 350 void KItemListView::setGeometry(const QRectF& rect)
 351 {
 352     QGraphicsWidget::setGeometry(rect);
 353
 354     if (!m_model) {
 355         return;
 356     }
 357
 358     const QSizeF newSize = rect.size();
 359     if (m_itemSize.isEmpty()) {
 360         // The item size is dynamic:
 361         // Changing the geometry does not require to do an expensive
 362         // update of the visible-roles sizes, only the stretched sizes
 363         // need to be adjusted to the new size.
 364         updateStretchedVisibleRolesSizes();
 365
 366         if (m_useHeaderWidths) {
 367             QSizeF dynamicItemSize = m_layouter->itemSize();
 368
 369             if (m_itemSize.width() < 0) {
 370                 const qreal requiredWidth = visibleRolesSizesWidthSum();
 371                 if (newSize.width() > requiredWidth) {
 372                     dynamicItemSize.setWidth(newSize.width());
 373                 }
 374                 const qreal headerWidth = qMax(newSize.width(), requiredWidth);
 375                 m_header->resize(headerWidth, m_header->size().height());
 376             }
 377
 378             if (m_itemSize.height() < 0) {
 379                 const qreal requiredHeight = visibleRolesSizesHeightSum();
 380                 if (newSize.height() > requiredHeight) {
 381                     dynamicItemSize.setHeight(newSize.height());
 382                 }
 383                 // TODO: KItemListHeader is not prepared for vertical alignment
 384             }
 385
 386             m_layouter->setItemSize(dynamicItemSize);
 387         }
 388
 389         // Triggering a synchronous layout is fine from a performance point of view,
 390         // as with dynamic item sizes no moving animation must be done.
 391         m_layouter->setSize(newSize);
 392         doLayout(Animation);
 393     } else {
 394         // The item size is not dynamic and most probably the geometry change results
 395         // in animated position changes of the items. Trigger an asynchronous relayout
 396         // with m_layoutTimer to prevent performance bottlenecks.
 397         if (m_model->count() > 0) {
 398             prepareLayoutForIncreasedItemCount(newSize, LayouterSize);
 399         } else {
 400             m_layouter->setSize(newSize);
 401         }
 402
 403         if (!m_layoutTimer->isActive()) {
 404             m_layoutTimer->start();
 405         }
 406     }
 407 }
 408
 409 int KItemListView::itemAt(const QPointF& pos) const
 410 {
 411     QHashIterator<int, KItemListWidget*> it(m_visibleItems);
 412     while (it.hasNext()) {
 413         it.next();
 414
 415         const KItemListWidget* widget = it.value();
 416         const QPointF mappedPos = widget->mapFromItem(this, pos);
 417         if (widget->contains(mappedPos)) {
 418             return it.key();
 419         }
 420     }
 421
 422     return -1;
 423 }
 424
 425 bool KItemListView::isAboveSelectionToggle(int index, const QPointF& pos) const
 426 {
 427     if (!m_enabledSelectionToggles) {
 428         return false;
 429     }
 430
 431     const KItemListWidget* widget = m_visibleItems.value(index);
 432     if (widget) {
 433         const QRectF selectionToggleRect = widget->selectionToggleRect();
 434         if (!selectionToggleRect.isEmpty()) {
 435             const QPointF mappedPos = widget->mapFromItem(this, pos);
 436             return selectionToggleRect.contains(mappedPos);
 437         }
 438     }
 439     return false;
 440 }
 441
 442 bool KItemListView::isAboveExpansionToggle(int index, const QPointF& pos) const
 443 {
 444     const KItemListWidget* widget = m_visibleItems.value(index);
 445     if (widget) {
 446         const QRectF expansionToggleRect = widget->expansionToggleRect();
 447         if (!expansionToggleRect.isEmpty()) {
 448             const QPointF mappedPos = widget->mapFromItem(this, pos);
 449             return expansionToggleRect.contains(mappedPos);
 450         }
 451     }
 452     return false;
 453 }
 454
 455 int KItemListView::firstVisibleIndex() const
 456 {
 457     return m_layouter->firstVisibleIndex();
 458 }
 459
 460 int KItemListView::lastVisibleIndex() const
 461 {
 462     return m_layouter->lastVisibleIndex();
 463 }
 464
 465 QSizeF KItemListView::itemSizeHint(int index) const
 466 {
 467     Q_UNUSED(index);
 468     return itemSize();
 469 }
 470
 471 QHash<QByteArray, QSizeF> KItemListView::visibleRolesSizes(const KItemRangeList& itemRanges) const
 472 {
 473     Q_UNUSED(itemRanges);
 474     return QHash<QByteArray, QSizeF>();
 475 }
 476
 477 bool KItemListView::supportsItemExpanding() const
 478 {
 479     return false;
 480 }
 481
 482 QRectF KItemListView::itemRect(int index) const
 483 {
 484     return m_layouter->itemRect(index);
 485 }
 486
 487 QRectF KItemListView::itemContextRect(int index) const
 488 {
 489     QRectF contextRect;
 490
 491     const KItemListWidget* widget = m_visibleItems.value(index);
 492     if (widget) {
 493         contextRect = widget->iconRect() | widget->textRect();
 494         contextRect.translate(itemRect(index).topLeft());
 495     }
 496
 497     return contextRect;
 498 }
 499
 500 void KItemListView::scrollToItem(int index)
 501 {
 502     QRectF viewGeometry = geometry();
 503     if (m_header) {
 504         const qreal headerHeight = m_header->size().height();
 505         viewGeometry.adjust(0, headerHeight, 0, 0);
 506     }
 507     const QRectF currentRect = itemRect(index);
 508
 509     if (!viewGeometry.contains(currentRect)) {
 510         qreal newOffset = scrollOffset();
 511         if (currentRect.top() < viewGeometry.top()) {
 512             Q_ASSERT(scrollOrientation() == Qt::Vertical);
 513             newOffset += currentRect.top() - viewGeometry.top();
 514         } else if ((currentRect.bottom() > viewGeometry.bottom())) {
 515             Q_ASSERT(scrollOrientation() == Qt::Vertical);
 516             newOffset += currentRect.bottom() - viewGeometry.bottom();
 517         } else if (currentRect.left() < viewGeometry.left()) {
 518             if (scrollOrientation() == Qt::Horizontal) {
 519                 newOffset += currentRect.left() - viewGeometry.left();
 520             }
 521         } else if ((currentRect.right() > viewGeometry.right())) {
 522             if (scrollOrientation() == Qt::Horizontal) {
 523                 newOffset += currentRect.right() - viewGeometry.right();
 524             }
 525         }
 526
 527         if (newOffset != scrollOffset()) {
 528             emit scrollTo(newOffset);
 529         }
 530     }
 531 }
 532
 533 void KItemListView::beginTransaction()
 534 {
 535     ++m_activeTransactions;
 536     if (m_activeTransactions == 1) {
 537         onTransactionBegin();
 538     }
 539 }
 540
 541 void KItemListView::endTransaction()
 542 {
 543     --m_activeTransactions;
 544     if (m_activeTransactions < 0) {
 545         m_activeTransactions = 0;
 546         kWarning() << "Mismatch between beginTransaction()/endTransaction()";
 547     }
 548
 549     if (m_activeTransactions == 0) {
 550         onTransactionEnd();
 551         doLayout(Animation);
 552     }
 553 }
 554
 555 bool KItemListView::isTransactionActive() const
 556 {
 557     return m_activeTransactions > 0;
 558 }
 559
 560
 561 void KItemListView::setHeaderShown(bool show)
 562 {
 563
 564     if (show && !m_header) {
 565         m_header = new KItemListHeader(this);
 566         m_header->setPos(0, 0);
 567         m_header->setModel(m_model);
 568         m_header->setVisibleRoles(m_visibleRoles);
 569         m_header->setVisibleRolesWidths(headerRolesWidths());
 570         m_header->setZValue(1);
 571
 572         connect(m_header, SIGNAL(visibleRoleWidthChanged(QByteArray,qreal,qreal)),
 573                 this, SLOT(slotVisibleRoleWidthChanged(QByteArray,qreal,qreal)));
 574         connect(m_header, SIGNAL(sortOrderChanged(Qt::SortOrder,Qt::SortOrder)),
 575                 this, SIGNAL(sortOrderChanged(Qt::SortOrder,Qt::SortOrder)));
 576         connect(m_header, SIGNAL(sortRoleChanged(QByteArray,QByteArray)),
 577                 this, SIGNAL(sortRoleChanged(QByteArray,QByteArray)));
 578
 579         m_useHeaderWidths = false;
 580
 581         m_layouter->setHeaderHeight(m_header->size().height());
 582     } else if (!show && m_header) {
 583         delete m_header;
 584         m_header = 0;
 585         m_useHeaderWidths = false;
 586         m_layouter->setHeaderHeight(0);
 587     }
 588 }
 589
 590 bool KItemListView::isHeaderShown() const
 591 {
 592     return m_header != 0;
 593 }
 594
 595 QPixmap KItemListView::createDragPixmap(const QSet<int>& indexes) const
 596 {
 597     Q_UNUSED(indexes);
 598     return QPixmap();
 599 }
 600
 601 void KItemListView::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
 602 {
 603     QGraphicsWidget::paint(painter, option, widget);
 604
 605     if (m_rubberBand->isActive()) {
 606         QRectF rubberBandRect = QRectF(m_rubberBand->startPosition(),
 607                                        m_rubberBand->endPosition()).normalized();
 608
 609         const QPointF topLeft = rubberBandRect.topLeft();
 610         if (scrollOrientation() == Qt::Vertical) {
 611             rubberBandRect.moveTo(topLeft.x(), topLeft.y() - scrollOffset());
 612         } else {
 613             rubberBandRect.moveTo(topLeft.x() - scrollOffset(), topLeft.y());
 614         }
 615
 616         QStyleOptionRubberBand opt;
 617         opt.initFrom(widget);
 618         opt.shape = QRubberBand::Rectangle;
 619         opt.opaque = false;
 620         opt.rect = rubberBandRect.toRect();
 621         style()->drawControl(QStyle::CE_RubberBand, &opt, painter);
 622     }
 623 }
 624
 625 void KItemListView::initializeItemListWidget(KItemListWidget* item)
 626 {
 627     Q_UNUSED(item);
 628 }
 629
 630 bool KItemListView::itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const
 631 {
 632     Q_UNUSED(changedRoles);
 633     return true;
 634 }
 635
 636 void KItemListView::onControllerChanged(KItemListController* current, KItemListController* previous)
 637 {
 638     Q_UNUSED(current);
 639     Q_UNUSED(previous);
 640 }
 641
 642 void KItemListView::onModelChanged(KItemModelBase* current, KItemModelBase* previous)
 643 {
 644     Q_UNUSED(current);
 645     Q_UNUSED(previous);
 646 }
 647
 648 void KItemListView::onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
 649 {
 650     Q_UNUSED(current);
 651     Q_UNUSED(previous);
 652 }
 653
 654 void KItemListView::onItemSizeChanged(const QSizeF& current, const QSizeF& previous)
 655 {
 656     Q_UNUSED(current);
 657     Q_UNUSED(previous);
 658 }
 659
 660 void KItemListView::onScrollOffsetChanged(qreal current, qreal previous)
 661 {
 662     Q_UNUSED(current);
 663     Q_UNUSED(previous);
 664 }
 665
 666 void KItemListView::onVisibleRolesChanged(const QList<QByteArray>& current, const QList<QByteArray>& previous)
 667 {
 668     Q_UNUSED(current);
 669     Q_UNUSED(previous);
 670 }
 671
 672 void KItemListView::onStyleOptionChanged(const KItemListStyleOption& current, const KItemListStyleOption& previous)
 673 {
 674     Q_UNUSED(current);
 675     Q_UNUSED(previous);
 676 }
 677
 678 void KItemListView::onTransactionBegin()
 679 {
 680 }
 681
 682 void KItemListView::onTransactionEnd()
 683 {
 684 }
 685
 686 bool KItemListView::event(QEvent* event)
 687 {
 688     // Forward all events to the controller and handle them there
 689     if (m_controller && m_controller->processEvent(event, transform())) {
 690         event->accept();
 691         return true;
 692     }
 693     return QGraphicsWidget::event(event);
 694 }
 695
 696 void KItemListView::mousePressEvent(QGraphicsSceneMouseEvent* event)
 697 {
 698     m_mousePos = transform().map(event->pos());
 699     event->accept();
 700 }
 701
 702 void KItemListView::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
 703 {
 704     QGraphicsWidget::mouseMoveEvent(event);
 705
 706     m_mousePos = transform().map(event->pos());
 707     if (m_autoScrollTimer && !m_autoScrollTimer->isActive()) {
 708         m_autoScrollTimer->start(InitialAutoScrollDelay);
 709     }
 710 }
 711
 712 void KItemListView::dragEnterEvent(QGraphicsSceneDragDropEvent* event)
 713 {
 714     event->setAccepted(true);
 715     setAutoScroll(true);
 716 }
 717
 718 void KItemListView::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
 719 {
 720     QGraphicsWidget::dragMoveEvent(event);
 721
 722     m_mousePos = transform().map(event->pos());
 723     if (m_autoScrollTimer && !m_autoScrollTimer->isActive()) {
 724         m_autoScrollTimer->start(InitialAutoScrollDelay);
 725     }
 726 }
 727
 728 void KItemListView::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
 729 {
 730     QGraphicsWidget::dragLeaveEvent(event);
 731     setAutoScroll(false);
 732 }
 733
 734 void KItemListView::dropEvent(QGraphicsSceneDragDropEvent* event)
 735 {
 736     QGraphicsWidget::dropEvent(event);
 737     setAutoScroll(false);
 738 }
 739
 740 QList<KItemListWidget*> KItemListView::visibleItemListWidgets() const
 741 {
 742     return m_visibleItems.values();
 743 }
 744
 745 void KItemListView::slotItemsInserted(const KItemRangeList& itemRanges)
 746 {
 747     updateVisibleRolesSizes(itemRanges);
 748
 749     const bool hasMultipleRanges = (itemRanges.count() > 1);
 750     if (hasMultipleRanges) {
 751         beginTransaction();
 752     }
 753
 754     int previouslyInsertedCount = 0;
 755     foreach (const KItemRange& range, itemRanges) {
 756         // range.index is related to the model before anything has been inserted.
 757         // As in each loop the current item-range gets inserted the index must
 758         // be increased by the already previously inserted items.
 759         const int index = range.index + previouslyInsertedCount;
 760         const int count = range.count;
 761         if (index < 0 || count <= 0) {
 762             kWarning() << "Invalid item range (index:" << index << ", count:" << count << ")";
 763             continue;
 764         }
 765         previouslyInsertedCount += count;
 766
 767         m_sizeHintResolver->itemsInserted(index, count);
 768
 769         // Determine which visible items must be moved
 770         QList<int> itemsToMove;
 771         QHashIterator<int, KItemListWidget*> it(m_visibleItems);
 772         while (it.hasNext()) {
 773             it.next();
 774             const int visibleItemIndex = it.key();
 775             if (visibleItemIndex >= index) {
 776                 itemsToMove.append(visibleItemIndex);
 777             }
 778         }
 779
 780         // Update the indexes of all KItemListWidget instances that are located
 781         // after the inserted items. It is important to adjust the indexes in the order
 782         // from the highest index to the lowest index to prevent overlaps when setting the new index.
 783         qSort(itemsToMove);
 784         for (int i = itemsToMove.count() - 1; i >= 0; --i) {
 785             KItemListWidget* widget = m_visibleItems.value(itemsToMove[i]);
 786             Q_ASSERT(widget);
 787             setWidgetIndex(widget, widget->index() + count);
 788         }
 789
 790         m_layouter->markAsDirty();
 791         if (m_model->count() == count && m_activeTransactions == 0) {
 792             // Check whether a scrollbar is required to show the inserted items. In this case
 793             // the size of the layouter will be decreased before calling doLayout(): This prevents
 794             // an unnecessary temporary animation due to the geometry change of the inserted scrollbar.
 795             const bool verticalScrollOrientation = (scrollOrientation() == Qt::Vertical);
 796             const bool decreaseLayouterSize = ( verticalScrollOrientation && maximumScrollOffset() > size().height()) ||
 797                                               (!verticalScrollOrientation && maximumScrollOffset() > size().width());
 798             if (decreaseLayouterSize) {
 799                 const int scrollBarExtent = style()->pixelMetric(QStyle::PM_ScrollBarExtent);
 800                 QSizeF layouterSize = m_layouter->size();
 801                 if (verticalScrollOrientation) {
 802                     layouterSize.rwidth() -= scrollBarExtent;
 803                 } else {
 804                     layouterSize.rheight() -= scrollBarExtent;
 805                 }
 806                 m_layouter->setSize(layouterSize);
 807             }
 808         }
 809
 810         if (!hasMultipleRanges) {
 811             doLayout(Animation, index, count);
 812         }
 813     }
 814
 815     if (m_controller) {
 816         m_controller->selectionManager()->itemsInserted(itemRanges);
 817     }
 818
 819     if (hasMultipleRanges) {
 820         endTransaction();
 821     }
 822 }
 823
 824 void KItemListView::slotItemsRemoved(const KItemRangeList& itemRanges)
 825 {
 826     updateVisibleRolesSizes();
 827
 828     const bool hasMultipleRanges = (itemRanges.count() > 1);
 829     if (hasMultipleRanges) {
 830         beginTransaction();
 831     }
 832
 833     for (int i = itemRanges.count() - 1; i >= 0; --i) {
 834         const KItemRange& range = itemRanges.at(i);
 835         const int index = range.index;
 836         const int count = range.count;
 837         if (index < 0 || count <= 0) {
 838             kWarning() << "Invalid item range (index:" << index << ", count:" << count << ")";
 839             continue;
 840         }
 841
 842         m_sizeHintResolver->itemsRemoved(index, count);
 843
 844         const int firstRemovedIndex = index;
 845         const int lastRemovedIndex = index + count - 1;
 846         const int lastIndex = m_model->count() + count - 1;
 847
 848         // Remove all KItemListWidget instances that got deleted
 849         for (int i = firstRemovedIndex; i <= lastRemovedIndex; ++i) {
 850             KItemListWidget* widget = m_visibleItems.value(i);
 851             if (!widget) {
 852                 continue;
 853             }
 854
 855             m_animation->stop(widget);
 856             // Stopping the animation might lead to recycling the widget if
 857             // it is invisible (see slotAnimationFinished()).
 858             // Check again whether it is still visible:
 859             if (!m_visibleItems.contains(i)) {
 860                 continue;
 861             }
 862
 863             if (m_model->count() == 0) {
 864                 // For performance reasons no animation is done when all items have
 865                 // been removed.
 866                 recycleWidget(widget);
 867             } else {
 868                 // Animate the removing of the items. Special case: When removing an item there
 869                 // is no valid model index available anymore. For the
 870                 // remove-animation the item gets removed from m_visibleItems but the widget
 871                 // will stay alive until the animation has been finished and will
 872                 // be recycled (deleted) in KItemListView::slotAnimationFinished().
 873                 m_visibleItems.remove(i);
 874                 widget->setIndex(-1);
 875                 m_animation->start(widget, KItemListViewAnimation::DeleteAnimation);
 876             }
 877         }
 878
 879         // Update the indexes of all KItemListWidget instances that are located
 880         // after the deleted items
 881         for (int i = lastRemovedIndex + 1; i <= lastIndex; ++i) {
 882             KItemListWidget* widget = m_visibleItems.value(i);
 883             if (widget) {
 884                 const int newIndex = i - count;
 885                 setWidgetIndex(widget, newIndex);
 886             }
 887         }
 888
 889         m_layouter->markAsDirty();
 890         if (!hasMultipleRanges) {
 891             // The decrease-layout-size optimization in KItemListView::slotItemsInserted()
 892             // assumes an updated geometry. If items are removed during an active transaction,
 893             // the transaction will be temporary deactivated so that doLayout() triggers a
 894             // geometry update if necessary.
 895             const int activeTransactions = m_activeTransactions;
 896             m_activeTransactions = 0;
 897             doLayout(Animation, index, -count);
 898             m_activeTransactions = activeTransactions;
 899         }
 900     }
 901
 902     if (m_controller) {
 903         m_controller->selectionManager()->itemsRemoved(itemRanges);
 904     }
 905
 906     if (hasMultipleRanges) {
 907         endTransaction();
 908     }
 909 }
 910
 911 void KItemListView::slotItemsMoved(const KItemRange& itemRange, const QList<int>& movedToIndexes)
 912 {
 913     m_sizeHintResolver->itemsMoved(itemRange.index, itemRange.count);
 914     m_layouter->markAsDirty();
 915
 916     if (m_controller) {
 917         m_controller->selectionManager()->itemsMoved(itemRange, movedToIndexes);
 918     }
 919
 920     const int firstVisibleMovedIndex = qMax(firstVisibleIndex(), itemRange.index);
 921     const int lastVisibleMovedIndex = qMin(lastVisibleIndex(), itemRange.index + itemRange.count - 1);
 922
 923     for (int index = firstVisibleMovedIndex; index <= lastVisibleMovedIndex; ++index) {
 924         KItemListWidget* widget = m_visibleItems.value(index);
 925         if (widget) {
 926             updateWidgetProperties(widget, index);
 927             if (m_grouped) {
 928                 updateGroupHeaderForWidget(widget);
 929             }
 930             initializeItemListWidget(widget);
 931         }
 932     }
 933
 934     doLayout(NoAnimation);
 935 }
 936
 937 void KItemListView::slotItemsChanged(const KItemRangeList& itemRanges,
 938                                      const QSet<QByteArray>& roles)
 939 {
 940     const bool updateSizeHints = itemSizeHintUpdateRequired(roles);
 941     if (updateSizeHints) {
 942         updateVisibleRolesSizes(itemRanges);
 943     }
 944
 945     foreach (const KItemRange& itemRange, itemRanges) {
 946         const int index = itemRange.index;
 947         const int count = itemRange.count;
 948
 949         if (updateSizeHints) {
 950             m_sizeHintResolver->itemsChanged(index, count, roles);
 951             m_layouter->markAsDirty();
 952
 953             if (!m_layoutTimer->isActive()) {
 954                 m_layoutTimer->start();
 955             }
 956         }
 957
 958         // Apply the changed roles to the visible item-widgets
 959         const int lastIndex = index + count - 1;
 960         for (int i = index; i <= lastIndex; ++i) {
 961             KItemListWidget* widget = m_visibleItems.value(i);
 962             if (widget) {
 963                 widget->setData(m_model->data(i), roles);
 964             }
 965         }
 966
 967         if (m_grouped && roles.contains(m_model->sortRole())) {
 968             // The sort-role has been changed which might result
 969             // in modified group headers
 970             updateVisibleGroupHeaders();
 971             doLayout(NoAnimation);
 972         }
 973     }
 974 }
 975
 976 void KItemListView::slotGroupedSortingChanged(bool current)
 977 {
 978     m_grouped = current;
 979     m_layouter->markAsDirty();
 980
 981     if (m_grouped) {
 982         // Apply the height of the header to the layouter
 983         const qreal groupHeaderHeight = m_styleOption.fontMetrics.height() +
 984                                         m_styleOption.margin * 2;
 985         m_layouter->setGroupHeaderHeight(groupHeaderHeight);
 986
 987         updateVisibleGroupHeaders();
 988     } else {
 989         // Clear all visible headers
 990         QMutableHashIterator<KItemListWidget*, KItemListGroupHeader*> it (m_visibleGroups);
 991         while (it.hasNext()) {
 992             it.next();
 993             recycleGroupHeaderForWidget(it.key());
 994         }
 995         Q_ASSERT(m_visibleGroups.isEmpty());
 996     }
 997
 998     doLayout(Animation);
 999 }
1000
1001 void KItemListView::slotSortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous)
1002 {
1003     Q_UNUSED(current);
1004     Q_UNUSED(previous);
1005     if (m_grouped) {
1006         updateVisibleGroupHeaders();
1007         doLayout(Animation);
1008     }
1009 }
1010
1011 void KItemListView::slotSortRoleChanged(const QByteArray& current, const QByteArray& previous)
1012 {
1013     Q_UNUSED(current);
1014     Q_UNUSED(previous);
1015     if (m_grouped) {
1016         updateVisibleGroupHeaders();
1017         doLayout(Animation);
1018     }
1019 }
1020
1021 void KItemListView::slotCurrentChanged(int current, int previous)
1022 {
1023     Q_UNUSED(previous);
1024
1025     KItemListWidget* previousWidget = m_visibleItems.value(previous, 0);
1026     if (previousWidget) {
1027         Q_ASSERT(previousWidget->isCurrent());
1028         previousWidget->setCurrent(false);
1029     }
1030
1031     KItemListWidget* currentWidget = m_visibleItems.value(current, 0);
1032     if (currentWidget) {
1033         Q_ASSERT(!currentWidget->isCurrent());
1034         currentWidget->setCurrent(true);
1035     }
1036 }
1037
1038 void KItemListView::slotSelectionChanged(const QSet<int>& current, const QSet<int>& previous)
1039 {
1040     Q_UNUSED(previous);
1041
1042     QHashIterator<int, KItemListWidget*> it(m_visibleItems);
1043     while (it.hasNext()) {
1044         it.next();
1045         const int index = it.key();
1046         KItemListWidget* widget = it.value();
1047         widget->setSelected(current.contains(index));
1048     }
1049 }
1050
1051 void KItemListView::slotAnimationFinished(QGraphicsWidget* widget,
1052                                           KItemListViewAnimation::AnimationType type)
1053 {
1054     KItemListWidget* itemListWidget = qobject_cast<KItemListWidget*>(widget);
1055     Q_ASSERT(itemListWidget);
1056
1057     switch (type) {
1058     case KItemListViewAnimation::DeleteAnimation: {
1059         // As we recycle the widget in this case it is important to assure that no
1060         // other animation has been started. This is a convention in KItemListView and
1061         // not a requirement defined by KItemListViewAnimation.
1062         Q_ASSERT(!m_animation->isStarted(itemListWidget));
1063
1064         // All KItemListWidgets that are animated by the DeleteAnimation are not maintained
1065         // by m_visibleWidgets and must be deleted manually after the animation has
1066         // been finished.
1067         recycleGroupHeaderForWidget(itemListWidget);
1068         m_widgetCreator->recycle(itemListWidget);
1069         break;
1070     }
1071
1072     case KItemListViewAnimation::CreateAnimation:
1073     case KItemListViewAnimation::MovingAnimation:
1074     case KItemListViewAnimation::ResizeAnimation: {
1075         const int index = itemListWidget->index();
1076         const bool invisible = (index < m_layouter->firstVisibleIndex()) ||
1077                                (index > m_layouter->lastVisibleIndex());
1078         if (invisible && !m_animation->isStarted(itemListWidget)) {
1079             recycleWidget(itemListWidget);
1080         }
1081         break;
1082     }
1083
1084     default: break;
1085     }
1086 }
1087
1088 void KItemListView::slotLayoutTimerFinished()
1089 {
1090     m_layouter->setSize(geometry().size());
1091     doLayout(Animation);
1092 }
1093
1094 void KItemListView::slotRubberBandPosChanged()
1095 {
1096     update();
1097 }
1098
1099 void KItemListView::slotRubberBandActivationChanged(bool active)
1100 {
1101     if (active) {
1102         connect(m_rubberBand, SIGNAL(startPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandPosChanged()));
1103         connect(m_rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandPosChanged()));
1104         m_skipAutoScrollForRubberBand = true;
1105     } else {
1106         disconnect(m_rubberBand, SIGNAL(startPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandPosChanged()));
1107         disconnect(m_rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandPosChanged()));
1108         m_skipAutoScrollForRubberBand = false;
1109     }
1110
1111     update();
1112 }
1113
1114 void KItemListView::slotVisibleRoleWidthChanged(const QByteArray& role,
1115                                                 qreal currentWidth,
1116                                                 qreal previousWidth)
1117 {
1118     Q_UNUSED(previousWidth);
1119
1120     m_useHeaderWidths = true;
1121
1122     if (m_visibleRolesSizes.contains(role)) {
1123         QSizeF roleSize = m_visibleRolesSizes.value(role);
1124         roleSize.setWidth(currentWidth);
1125         m_visibleRolesSizes.insert(role, roleSize);
1126         m_stretchedVisibleRolesSizes.insert(role, roleSize);
1127
1128         // Apply the new size to the layouter
1129         QSizeF dynamicItemSize = m_itemSize;
1130         if (dynamicItemSize.width() < 0) {
1131             const qreal requiredWidth = visibleRolesSizesWidthSum();
1132             dynamicItemSize.setWidth(qMax(size().width(), requiredWidth));
1133         }
1134         if (dynamicItemSize.height() < 0) {
1135             const qreal requiredHeight = visibleRolesSizesHeightSum();
1136             dynamicItemSize.setHeight(qMax(size().height(), requiredHeight));
1137         }
1138
1139         m_layouter->setItemSize(dynamicItemSize);
1140
1141         // Update the role sizes for all visible widgets
1142         foreach (KItemListWidget* widget, visibleItemListWidgets()) {
1143             widget->setVisibleRolesSizes(m_stretchedVisibleRolesSizes);
1144         }
1145
1146         doLayout(Animation);
1147     }
1148 }
1149
1150 void KItemListView::triggerAutoScrolling()
1151 {
1152     if (!m_autoScrollTimer) {
1153         return;
1154     }
1155
1156     int pos = 0;
1157     int visibleSize = 0;
1158     if (scrollOrientation() == Qt::Vertical) {
1159         pos = m_mousePos.y();
1160         visibleSize = size().height();
1161     } else {
1162         pos = m_mousePos.x();
1163         visibleSize = size().width();
1164     }
1165
1166     if (m_autoScrollTimer->interval() == InitialAutoScrollDelay) {
1167         m_autoScrollIncrement = 0;
1168     }
1169
1170     m_autoScrollIncrement = calculateAutoScrollingIncrement(pos, visibleSize, m_autoScrollIncrement);
1171     if (m_autoScrollIncrement == 0) {
1172         // The mouse position is not above an autoscroll margin (the autoscroll timer
1173         // will be restarted in mouseMoveEvent())
1174         m_autoScrollTimer->stop();
1175         return;
1176     }
1177
1178     if (m_rubberBand->isActive() && m_skipAutoScrollForRubberBand) {
1179         // If a rubberband selection is ongoing the autoscrolling may only get triggered
1180         // if the direction of the rubberband is similar to the autoscroll direction. This
1181         // prevents that starting to create a rubberband within the autoscroll margins starts
1182         // an autoscrolling.
1183
1184         const qreal minDiff = 4; // Ignore any autoscrolling if the rubberband is very small
1185         const qreal diff = (scrollOrientation() == Qt::Vertical)
1186                            ? m_rubberBand->endPosition().y() - m_rubberBand->startPosition().y()
1187                            : m_rubberBand->endPosition().x() - m_rubberBand->startPosition().x();
1188         if (qAbs(diff) < minDiff || (m_autoScrollIncrement < 0 && diff > 0) || (m_autoScrollIncrement > 0 && diff < 0)) {
1189             // The rubberband direction is different from the scroll direction (e.g. the rubberband has
1190             // been moved up although the autoscroll direction might be down)
1191             m_autoScrollTimer->stop();
1192             return;
1193         }
1194     }
1195
1196     // As soon as the autoscrolling has been triggered at least once despite having an active rubberband,
1197     // the autoscrolling may not get skipped anymore until a new rubberband is created
1198     m_skipAutoScrollForRubberBand = false;
1199
1200     const qreal maxVisibleOffset = qMax(qreal(0), maximumScrollOffset() - visibleSize);
1201     const qreal newScrollOffset = qMin(scrollOffset() + m_autoScrollIncrement, maxVisibleOffset);
1202     setScrollOffset(newScrollOffset);
1203
1204    // Trigger the autoscroll timer which will periodically call
1205    // triggerAutoScrolling()
1206    m_autoScrollTimer->start(RepeatingAutoScrollDelay);
1207 }
1208
1209 void KItemListView::setController(KItemListController* controller)
1210 {
1211     if (m_controller != controller) {
1212         KItemListController* previous = m_controller;
1213         if (previous) {
1214             KItemListSelectionManager* selectionManager = previous->selectionManager();
1215             disconnect(selectionManager, SIGNAL(currentChanged(int,int)), this, SLOT(slotCurrentChanged(int,int)));
1216             disconnect(selectionManager, SIGNAL(selectionChanged(QSet<int>,QSet<int>)), this, SLOT(slotSelectionChanged(QSet<int>,QSet<int>)));
1217         }
1218
1219         m_controller = controller;
1220
1221         if (controller) {
1222             KItemListSelectionManager* selectionManager = controller->selectionManager();
1223             connect(selectionManager, SIGNAL(currentChanged(int,int)), this, SLOT(slotCurrentChanged(int,int)));
1224             connect(selectionManager, SIGNAL(selectionChanged(QSet<int>,QSet<int>)), this, SLOT(slotSelectionChanged(QSet<int>,QSet<int>)));
1225         }
1226
1227         onControllerChanged(controller, previous);
1228     }
1229 }
1230
1231 void KItemListView::setModel(KItemModelBase* model)
1232 {
1233     if (m_model == model) {
1234         return;
1235     }
1236
1237     KItemModelBase* previous = m_model;
1238
1239     if (m_model) {
1240         disconnect(m_model, SIGNAL(itemsChanged(KItemRangeList,QSet<QByteArray>)),
1241                    this,    SLOT(slotItemsChanged(KItemRangeList,QSet<QByteArray>)));
1242         disconnect(m_model, SIGNAL(itemsInserted(KItemRangeList)),
1243                    this,    SLOT(slotItemsInserted(KItemRangeList)));
1244         disconnect(m_model, SIGNAL(itemsRemoved(KItemRangeList)),
1245                    this,    SLOT(slotItemsRemoved(KItemRangeList)));
1246         disconnect(m_model, SIGNAL(itemsMoved(KItemRange,QList<int>)),
1247                    this,    SLOT(slotItemsMoved(KItemRange,QList<int>)));
1248         disconnect(m_model, SIGNAL(groupedSortingChanged(bool)),
1249                    this,    SLOT(slotGroupedSortingChanged(bool)));
1250         disconnect(m_model, SIGNAL(sortOrderChanged(Qt::SortOrder,Qt::SortOrder)),
1251                    this,    SLOT(slotSortOrderChanged(Qt::SortOrder,Qt::SortOrder)));
1252         disconnect(m_model, SIGNAL(sortRoleChanged(QByteArray,QByteArray)),
1253                    this,    SLOT(slotSortRoleChanged(QByteArray,QByteArray)));
1254     }
1255
1256     m_model = model;
1257     m_layouter->setModel(model);
1258     m_grouped = model->groupedSorting();
1259
1260     if (m_model) {
1261         connect(m_model, SIGNAL(itemsChanged(KItemRangeList,QSet<QByteArray>)),
1262                 this,    SLOT(slotItemsChanged(KItemRangeList,QSet<QByteArray>)));
1263         connect(m_model, SIGNAL(itemsInserted(KItemRangeList)),
1264                 this,    SLOT(slotItemsInserted(KItemRangeList)));
1265         connect(m_model, SIGNAL(itemsRemoved(KItemRangeList)),
1266                 this,    SLOT(slotItemsRemoved(KItemRangeList)));
1267         connect(m_model, SIGNAL(itemsMoved(KItemRange,QList<int>)),
1268                 this,    SLOT(slotItemsMoved(KItemRange,QList<int>)));
1269         connect(m_model, SIGNAL(groupedSortingChanged(bool)),
1270                 this,    SLOT(slotGroupedSortingChanged(bool)));
1271         connect(m_model, SIGNAL(sortOrderChanged(Qt::SortOrder,Qt::SortOrder)),
1272                 this,    SLOT(slotSortOrderChanged(Qt::SortOrder,Qt::SortOrder)));
1273         connect(m_model, SIGNAL(sortRoleChanged(QByteArray,QByteArray)),
1274                 this,    SLOT(slotSortRoleChanged(QByteArray,QByteArray)));
1275     }
1276
1277     onModelChanged(model, previous);
1278 }
1279
1280 KItemListRubberBand* KItemListView::rubberBand() const
1281 {
1282     return m_rubberBand;
1283 }
1284
1285 void KItemListView::doLayout(LayoutAnimationHint hint, int changedIndex, int changedCount)
1286 {
1287     if (m_layoutTimer->isActive()) {
1288         m_layoutTimer->stop();
1289     }
1290
1291     if (!m_model || m_model->count() < 0 || m_activeTransactions > 0) {
1292         return;
1293     }
1294
1295     const int firstVisibleIndex = m_layouter->firstVisibleIndex();
1296     const int lastVisibleIndex = m_layouter->lastVisibleIndex();
1297     if (firstVisibleIndex < 0) {
1298         emitOffsetChanges();
1299         return;
1300     }
1301
1302     // Do a sanity check of the scroll-offset property: When properties of the itemlist-view have been changed
1303     // it might be possible that the maximum offset got changed too. Assure that the full visible range
1304     // is still shown if the maximum offset got decreased.
1305     const qreal visibleOffsetRange = (scrollOrientation() == Qt::Horizontal) ? size().width() : size().height();
1306     const qreal maxOffsetToShowFullRange = maximumScrollOffset() - visibleOffsetRange;
1307     if (scrollOffset() > maxOffsetToShowFullRange) {
1308         m_layouter->setScrollOffset(qMax(qreal(0), maxOffsetToShowFullRange));
1309     }
1310
1311     // Determine all items that are completely invisible and might be
1312     // reused for items that just got (at least partly) visible.
1313     // Items that do e.g. an animated moving of their position are not
1314     // marked as invisible: This assures that a scrolling inside the view
1315     // can be done without breaking an animation.
1316     QList<int> reusableItems;
1317     QHashIterator<int, KItemListWidget*> it(m_visibleItems);
1318     while (it.hasNext()) {
1319         it.next();
1320         KItemListWidget* widget = it.value();
1321         const int index = widget->index();
1322         const bool invisible = (index < firstVisibleIndex) || (index > lastVisibleIndex);
1323         if (invisible && !m_animation->isStarted(widget)) {
1324             widget->setVisible(false);
1325             reusableItems.append(index);
1326
1327             if (m_grouped) {
1328                 recycleGroupHeaderForWidget(widget);
1329             }
1330         }
1331     }
1332
1333     // Assure that for each visible item a KItemListWidget is available. KItemListWidget
1334     // instances from invisible items are reused. If no reusable items are
1335     // found then new KItemListWidget instances get created.
1336     const bool animate = (hint == Animation);
1337     for (int i = firstVisibleIndex; i <= lastVisibleIndex; ++i) {
1338         bool applyNewPos = true;
1339         bool wasHidden = false;
1340
1341         const QRectF itemBounds = m_layouter->itemRect(i);
1342         const QPointF newPos = itemBounds.topLeft();
1343         KItemListWidget* widget = m_visibleItems.value(i);
1344         if (!widget) {
1345             wasHidden = true;
1346             if (!reusableItems.isEmpty()) {
1347                 // Reuse a KItemListWidget instance from an invisible item
1348                 const int oldIndex = reusableItems.takeLast();
1349                 widget = m_visibleItems.value(oldIndex);
1350                 setWidgetIndex(widget, i);
1351
1352                 if (m_grouped) {
1353                     updateGroupHeaderForWidget(widget);
1354                 }
1355             } else {
1356                 // No reusable KItemListWidget instance is available, create a new one
1357                 widget = createWidget(i);
1358             }
1359             widget->resize(itemBounds.size());
1360
1361             if (animate && changedCount < 0) {
1362                 // Items have been deleted, move the created item to the
1363                 // imaginary old position. They will get animated to the new position
1364                 // later.
1365                 const QRectF itemRect = m_layouter->itemRect(i - changedCount);
1366                 if (itemRect.isEmpty()) {
1367                     const QPointF invisibleOldPos = (scrollOrientation() == Qt::Vertical)
1368                                                     ? QPointF(0, size().height()) : QPointF(size().width(), 0);
1369                     widget->setPos(invisibleOldPos);
1370                 } else {
1371                     widget->setPos(itemRect.topLeft());
1372                 }
1373                 applyNewPos = false;
1374             }
1375         } else if (m_animation->isStarted(widget, KItemListViewAnimation::MovingAnimation)) {
1376             applyNewPos = false;
1377         }
1378
1379         if (animate) {
1380             const bool itemsRemoved = (changedCount < 0);
1381             const bool itemsInserted = (changedCount > 0);
1382             if (itemsRemoved && (i >= changedIndex + changedCount + 1)) {
1383                 // The item is located after the removed items. Animate the moving of the position.
1384                 m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
1385                 applyNewPos = false;
1386             } else if (itemsInserted && i >= changedIndex) {
1387                 // The item is located after the first inserted item
1388                 if (i <= changedIndex + changedCount - 1) {
1389                     // The item is an inserted item. Animate the appearing of the item.
1390                     // For performance reasons no animation is done when changedCount is equal
1391                     // to all available items.
1392                     if (changedCount < m_model->count()) {
1393                         m_animation->start(widget, KItemListViewAnimation::CreateAnimation);
1394                     }
1395                 } else if (!m_animation->isStarted(widget, KItemListViewAnimation::CreateAnimation)) {
1396                     // The item was already there before, so animate the moving of the position.
1397                     // No moving animation is done if the item is animated by a create animation: This
1398                     // prevents a "move animation mess" when inserting several ranges in parallel.
1399                     m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
1400                     applyNewPos = false;
1401                 }
1402             } else if (!itemsRemoved && !itemsInserted && !wasHidden) {
1403                 // The size of the view might have been changed. Animate the moving of the position.
1404                 m_animation->start(widget, KItemListViewAnimation::MovingAnimation, newPos);
1405                 applyNewPos = false;
1406             }
1407         }
1408
1409         if (applyNewPos) {
1410             widget->setPos(newPos);
1411         }
1412
1413         Q_ASSERT(widget->index() == i);
1414         widget->setVisible(true);
1415
1416         if (widget->size() != itemBounds.size()) {
1417             // Resize the widget for the item to the changed size.
1418             if (animate) {
1419                 // If a dynamic item size is used then no animation is done in the direction
1420                 // of the dynamic size.
1421                 if (m_itemSize.width() <= 0) {
1422                     // The width is dynamic, apply the new width without animation.
1423                     widget->resize(itemBounds.width(), widget->size().height());
1424                 } else if (m_itemSize.height() <= 0) {
1425                     // The height is dynamic, apply the new height without animation.
1426                     widget->resize(widget->size().width(), itemBounds.height());
1427                 }
1428                 m_animation->start(widget, KItemListViewAnimation::ResizeAnimation, itemBounds.size());
1429             } else {
1430                 widget->resize(itemBounds.size());
1431             }
1432         }
1433     }
1434
1435     // Delete invisible KItemListWidget instances that have not been reused
1436     foreach (int index, reusableItems) {
1437         recycleWidget(m_visibleItems.value(index));
1438     }
1439
1440     if (m_grouped) {
1441         // Update the layout of all visible group headers
1442         QHashIterator<KItemListWidget*, KItemListGroupHeader*> it(m_visibleGroups);
1443         while (it.hasNext()) {
1444             it.next();
1445             updateGroupHeaderLayout(it.key());
1446         }
1447     }
1448
1449     emitOffsetChanges();
1450 }
1451
1452 void KItemListView::emitOffsetChanges()
1453 {
1454     const qreal newScrollOffset = m_layouter->scrollOffset();
1455     if (m_oldScrollOffset != newScrollOffset) {
1456         emit scrollOffsetChanged(newScrollOffset, m_oldScrollOffset);
1457         m_oldScrollOffset = newScrollOffset;
1458     }
1459
1460     const qreal newMaximumScrollOffset = m_layouter->maximumScrollOffset();
1461     if (m_oldMaximumScrollOffset != newMaximumScrollOffset) {
1462         emit maximumScrollOffsetChanged(newMaximumScrollOffset, m_oldMaximumScrollOffset);
1463         m_oldMaximumScrollOffset = newMaximumScrollOffset;
1464     }
1465
1466     const qreal newItemOffset = m_layouter->itemOffset();
1467     if (m_oldItemOffset != newItemOffset) {
1468         emit itemOffsetChanged(newItemOffset, m_oldItemOffset);
1469         m_oldItemOffset = newItemOffset;
1470     }
1471
1472     const qreal newMaximumItemOffset = m_layouter->maximumItemOffset();
1473     if (m_oldMaximumItemOffset != newMaximumItemOffset) {
1474         emit maximumItemOffsetChanged(newMaximumItemOffset, m_oldMaximumItemOffset);
1475         m_oldMaximumItemOffset = newMaximumItemOffset;
1476     }
1477 }
1478
1479 KItemListWidget* KItemListView::createWidget(int index)
1480 {
1481     KItemListWidget* widget = m_widgetCreator->create(this);
1482     widget->setFlag(QGraphicsItem::ItemStacksBehindParent);
1483
1484     updateWidgetProperties(widget, index);
1485     m_visibleItems.insert(index, widget);
1486
1487     if (m_grouped) {
1488         updateGroupHeaderForWidget(widget);
1489     }
1490
1491     initializeItemListWidget(widget);
1492     return widget;
1493 }
1494
1495 void KItemListView::recycleWidget(KItemListWidget* widget)
1496 {
1497     if (m_grouped) {
1498         recycleGroupHeaderForWidget(widget);
1499     }
1500
1501     m_visibleItems.remove(widget->index());
1502     m_widgetCreator->recycle(widget);
1503 }
1504
1505 void KItemListView::setWidgetIndex(KItemListWidget* widget, int index)
1506 {
1507     const int oldIndex = widget->index();
1508     m_visibleItems.remove(oldIndex);
1509     updateWidgetProperties(widget, index);
1510     m_visibleItems.insert(index, widget);
1511
1512     initializeItemListWidget(widget);
1513 }
1514
1515 void KItemListView::prepareLayoutForIncreasedItemCount(const QSizeF& size, SizeType sizeType)
1516 {
1517     // Calculate the first visible index and last visible index for the current size
1518     const int currentFirst = m_layouter->firstVisibleIndex();
1519     const int currentLast = m_layouter->lastVisibleIndex();
1520
1521     const QSizeF currentSize = (sizeType == LayouterSize) ? m_layouter->size() : m_layouter->itemSize();
1522
1523     // Calculate the first visible index and last visible index for the new size
1524     setLayouterSize(size, sizeType);
1525     const int newFirst = m_layouter->firstVisibleIndex();
1526     const int newLast = m_layouter->lastVisibleIndex();
1527
1528     if ((currentFirst != newFirst) || (currentLast != newLast)) {
1529         // At least one index has been changed. Assure that widgets for all possible
1530         // visible items get created so that a move-animation can be started later.
1531         const int maxVisibleItems = m_layouter->maximumVisibleItems();
1532         int minFirst = qMin(newFirst, currentFirst);
1533         const int maxLast = qMax(newLast, currentLast);
1534
1535         if (maxLast - minFirst + 1 < maxVisibleItems) {
1536             // Increasing the size might result in a smaller KItemListView::offset().
1537             // Decrease the first visible index in a way that at least the maximum
1538             // visible items are shown.
1539             minFirst = qMax(0, maxLast - maxVisibleItems + 1);
1540         }
1541
1542         if (maxLast - minFirst > maxVisibleItems  + maxVisibleItems / 2) {
1543             // The creating of widgets is quite expensive. Assure that never more
1544             // than 50 % of the maximum visible items get created for the animations.
1545             return;
1546         }
1547
1548         setLayouterSize(currentSize, sizeType);
1549         for (int i = minFirst; i <= maxLast; ++i) {
1550             if (!m_visibleItems.contains(i)) {
1551                 KItemListWidget* widget = createWidget(i);
1552                 const QRectF itemRect = m_layouter->itemRect(i);
1553                 widget->setPos(itemRect.topLeft());
1554                 widget->resize(itemRect.size());
1555             }
1556         }
1557         setLayouterSize(size, sizeType);
1558     }
1559 }
1560
1561 void KItemListView::setLayouterSize(const QSizeF& size, SizeType sizeType)
1562 {
1563     switch (sizeType) {
1564     case LayouterSize: m_layouter->setSize(size); break;
1565     case ItemSize: m_layouter->setItemSize(size); break;
1566     default: break;
1567     }
1568 }
1569
1570 void KItemListView::updateWidgetProperties(KItemListWidget* widget, int index)
1571 {
1572     widget->setVisibleRoles(m_visibleRoles);
1573     widget->setVisibleRolesSizes(m_stretchedVisibleRolesSizes);
1574     widget->setStyleOption(m_styleOption);
1575
1576     const KItemListSelectionManager* selectionManager = m_controller->selectionManager();
1577     widget->setCurrent(index == selectionManager->currentItem());
1578     widget->setSelected(selectionManager->isSelected(index));
1579     widget->setHovered(false);
1580     widget->setAlternatingBackgroundColors(false);
1581     widget->setEnabledSelectionToggle(enabledSelectionToggles());
1582     widget->setIndex(index);
1583     widget->setData(m_model->data(index));
1584 }
1585
1586 void KItemListView::updateGroupHeaderForWidget(KItemListWidget* widget)
1587 {
1588     Q_ASSERT(m_grouped);
1589
1590     const int index = widget->index();
1591     if (!m_layouter->isFirstGroupItem(index)) {
1592         // The widget does not represent the first item of a group
1593         // and hence requires no header
1594         recycleGroupHeaderForWidget(widget);
1595         return;
1596     }
1597
1598     const QList<QPair<int, QVariant> > groups = model()->groups();
1599     if (groups.isEmpty()) {
1600         return;
1601     }
1602
1603     KItemListGroupHeader* header = m_visibleGroups.value(widget);
1604     if (!header) {
1605         header = m_groupHeaderCreator->create(this);
1606         header->setParentItem(widget);
1607         m_visibleGroups.insert(widget, header);
1608     }
1609     Q_ASSERT(header->parentItem() == widget);
1610
1611     // Determine the shown data for the header by doing a binary
1612     // search in the groups-list
1613     int min = 0;
1614     int max = groups.count() - 1;
1615     int mid = 0;
1616     do {
1617         mid = (min + max) / 2;
1618         if (index > groups.at(mid).first) {
1619             min = mid + 1;
1620         } else {
1621             max = mid - 1;
1622         }
1623     } while (groups.at(mid).first != index && min <= max);
1624
1625     header->setData(groups.at(mid).second);
1626     header->setRole(model()->sortRole());
1627     header->setStyleOption(m_styleOption);
1628     header->setScrollOrientation(scrollOrientation());
1629
1630     header->show();
1631 }
1632
1633 void KItemListView::updateGroupHeaderLayout(KItemListWidget* widget)
1634 {
1635     KItemListGroupHeader* header = m_visibleGroups.value(widget);
1636     Q_ASSERT(header);
1637
1638     const int index = widget->index();
1639     const QRectF groupHeaderRect = m_layouter->groupHeaderRect(index);
1640     const QRectF itemRect = m_layouter->itemRect(index);
1641
1642     // The group-header is a child of the itemlist widget. Translate the
1643     // group header position to the relative position.
1644     const QPointF groupHeaderPos(groupHeaderRect.x() - itemRect.x(),
1645                                  - groupHeaderRect.height());
1646     header->setPos(groupHeaderPos);
1647     header->resize(groupHeaderRect.size());
1648 }
1649
1650 void KItemListView::recycleGroupHeaderForWidget(KItemListWidget* widget)
1651 {
1652     KItemListGroupHeader* header = m_visibleGroups.value(widget);
1653     if (header) {
1654         header->setParentItem(0);
1655         m_groupHeaderCreator->recycle(header);
1656         m_visibleGroups.remove(widget);
1657     }
1658 }
1659
1660 void KItemListView::updateVisibleGroupHeaders()
1661 {
1662     Q_ASSERT(m_grouped);
1663     m_layouter->markAsDirty();
1664
1665     QHashIterator<int, KItemListWidget*> it(m_visibleItems);
1666     while (it.hasNext()) {
1667         it.next();
1668         updateGroupHeaderForWidget(it.value());
1669     }
1670 }
1671
1672 QHash<QByteArray, qreal> KItemListView::headerRolesWidths() const
1673 {
1674     QHash<QByteArray, qreal> rolesWidths;
1675
1676     QHashIterator<QByteArray, QSizeF> it(m_stretchedVisibleRolesSizes);
1677     while (it.hasNext()) {
1678         it.next();
1679         rolesWidths.insert(it.key(), it.value().width());
1680     }
1681
1682     return rolesWidths;
1683 }
1684
1685 void KItemListView::updateVisibleRolesSizes(const KItemRangeList& itemRanges)
1686 {
1687     if (!m_itemSize.isEmpty() || m_useHeaderWidths) {
1688         return;
1689     }
1690
1691     const int itemCount = m_model->count();
1692     int rangesItemCount = 0;
1693     foreach (const KItemRange& range, itemRanges) {
1694         rangesItemCount += range.count;
1695     }
1696
1697     if (itemCount == rangesItemCount) {
1698         m_visibleRolesSizes = visibleRolesSizes(itemRanges);
1699         if (m_header) {
1700             // Assure the the sizes are not smaller than the minimum defined by the header
1701             // TODO: Currently only implemented for a top-aligned header
1702             const qreal minHeaderRoleWidth = m_header->minimumRoleWidth();
1703             QMutableHashIterator<QByteArray, QSizeF> it (m_visibleRolesSizes);
1704             while (it.hasNext()) {
1705                 it.next();
1706                 const QSizeF& size = it.value();
1707                 if (size.width() < minHeaderRoleWidth) {
1708                     const QSizeF newSize(minHeaderRoleWidth, size.height());
1709                     m_visibleRolesSizes.insert(it.key(), newSize);
1710                 }
1711             }
1712         }
1713     } else {
1714         // Only a sub range of the roles need to be determined.
1715         // The chances are good that the sizes of the sub ranges
1716         // already fit into the available sizes and hence no
1717         // expensive update might be required.
1718         bool updateRequired = false;
1719
1720         const QHash<QByteArray, QSizeF> updatedSizes = visibleRolesSizes(itemRanges);
1721         QHashIterator<QByteArray, QSizeF> it(updatedSizes);
1722         while (it.hasNext()) {
1723             it.next();
1724             const QByteArray& role = it.key();
1725             const QSizeF& updatedSize = it.value();
1726             const QSizeF currentSize = m_visibleRolesSizes.value(role);
1727             if (updatedSize.width() > currentSize.width() || updatedSize.height() > currentSize.height()) {
1728                 m_visibleRolesSizes.insert(role, updatedSize);
1729                 updateRequired = true;
1730             }
1731         }
1732
1733         if (!updateRequired) {
1734             // All the updated sizes are smaller than the current sizes and no change
1735             // of the stretched roles-widths is required
1736             return;
1737         }
1738     }
1739
1740     updateStretchedVisibleRolesSizes();
1741 }
1742
1743 void KItemListView::updateVisibleRolesSizes()
1744 {
1745     if (!m_model) {
1746         return;
1747     }
1748
1749     const int itemCount = m_model->count();
1750     if (itemCount > 0) {
1751         updateVisibleRolesSizes(KItemRangeList() << KItemRange(0, itemCount));
1752     }
1753 }
1754
1755 void KItemListView::updateStretchedVisibleRolesSizes()
1756 {
1757     if (!m_itemSize.isEmpty() || m_useHeaderWidths || m_visibleRoles.isEmpty()) {
1758         return;
1759     }
1760
1761     // Calculate the maximum size of an item by considering the
1762     // visible role sizes and apply them to the layouter. If the
1763     // size does not use the available view-size it the size of the
1764     // first role will get stretched.
1765     m_stretchedVisibleRolesSizes = m_visibleRolesSizes;
1766     const QByteArray role = m_visibleRoles.first();
1767     QSizeF firstRoleSize = m_stretchedVisibleRolesSizes.value(role);
1768
1769     QSizeF dynamicItemSize = m_itemSize;
1770
1771     if (dynamicItemSize.width() <= 0) {
1772         const qreal requiredWidth = visibleRolesSizesWidthSum();
1773         const qreal availableWidth = size().width();
1774         if (requiredWidth < availableWidth) {
1775             // Stretch the first role to use the whole width for the item
1776             firstRoleSize.rwidth() += availableWidth - requiredWidth;
1777             m_stretchedVisibleRolesSizes.insert(role, firstRoleSize);
1778         }
1779         dynamicItemSize.setWidth(qMax(requiredWidth, availableWidth));
1780     }
1781
1782     if (dynamicItemSize.height() <= 0) {
1783         const qreal requiredHeight = visibleRolesSizesHeightSum();
1784         const qreal availableHeight = size().height();
1785         if (requiredHeight < availableHeight) {
1786             // Stretch the first role to use the whole height for the item
1787             firstRoleSize.rheight() += availableHeight - requiredHeight;
1788             m_stretchedVisibleRolesSizes.insert(role, firstRoleSize);
1789         }
1790         dynamicItemSize.setHeight(qMax(requiredHeight, availableHeight));
1791     }
1792
1793     m_layouter->setItemSize(dynamicItemSize);
1794
1795     if (m_header) {
1796         m_header->setVisibleRolesWidths(headerRolesWidths());
1797         m_header->resize(dynamicItemSize.width(), m_header->size().height());
1798     }
1799
1800     // Update the role sizes for all visible widgets
1801     foreach (KItemListWidget* widget, visibleItemListWidgets()) {
1802         widget->setVisibleRolesSizes(m_stretchedVisibleRolesSizes);
1803     }
1804 }
1805
1806 qreal KItemListView::visibleRolesSizesWidthSum() const
1807 {
1808     qreal widthSum = 0;
1809     QHashIterator<QByteArray, QSizeF> it(m_visibleRolesSizes);
1810     while (it.hasNext()) {
1811         it.next();
1812         widthSum += it.value().width();
1813     }
1814     return widthSum;
1815 }
1816
1817 qreal KItemListView::visibleRolesSizesHeightSum() const
1818 {
1819     qreal heightSum = 0;
1820     QHashIterator<QByteArray, QSizeF> it(m_visibleRolesSizes);
1821     while (it.hasNext()) {
1822         it.next();
1823         heightSum += it.value().height();
1824     }
1825     return heightSum;
1826 }
1827
1828 QRectF KItemListView::headerBoundaries() const
1829 {
1830     return m_header ? m_header->geometry() : QRectF();
1831 }
1832
1833 int KItemListView::calculateAutoScrollingIncrement(int pos, int range, int oldInc)
1834 {
1835     int inc = 0;
1836
1837     const int minSpeed = 4;
1838     const int maxSpeed = 128;
1839     const int speedLimiter = 96;
1840     const int autoScrollBorder = 64;
1841
1842     // Limit the increment that is allowed to be added in comparison to 'oldInc'.
1843     // This assures that the autoscrolling speed grows gradually.
1844     const int incLimiter = 1;
1845
1846     if (pos < autoScrollBorder) {
1847         inc = -minSpeed + qAbs(pos - autoScrollBorder) * (pos - autoScrollBorder) / speedLimiter;
1848         inc = qMax(inc, -maxSpeed);
1849         inc = qMax(inc, oldInc - incLimiter);
1850     } else if (pos > range - autoScrollBorder) {
1851         inc = minSpeed + qAbs(pos - range + autoScrollBorder) * (pos - range + autoScrollBorder) / speedLimiter;
1852         inc = qMin(inc, maxSpeed);
1853         inc = qMin(inc, oldInc + incLimiter);
1854     }
1855
1856     return inc;
1857 }
1858
1859
1860
1861 KItemListCreatorBase::~KItemListCreatorBase()
1862 {
1863     qDeleteAll(m_recycleableWidgets);
1864     qDeleteAll(m_createdWidgets);
1865 }
1866
1867 void KItemListCreatorBase::addCreatedWidget(QGraphicsWidget* widget)
1868 {
1869     m_createdWidgets.insert(widget);
1870 }
1871
1872 void KItemListCreatorBase::pushRecycleableWidget(QGraphicsWidget* widget)
1873 {
1874     Q_ASSERT(m_createdWidgets.contains(widget));
1875     m_createdWidgets.remove(widget);
1876
1877     if (m_recycleableWidgets.count() < 100) {
1878         m_recycleableWidgets.append(widget);
1879         widget->setVisible(false);
1880     } else {
1881         delete widget;
1882     }
1883 }
1884
1885 QGraphicsWidget* KItemListCreatorBase::popRecycleableWidget()
1886 {
1887     if (m_recycleableWidgets.isEmpty()) {
1888         return 0;
1889     }
1890
1891     QGraphicsWidget* widget = m_recycleableWidgets.takeLast();
1892     m_createdWidgets.insert(widget);
1893     return widget;
1894 }
1895
1896 KItemListWidgetCreatorBase::~KItemListWidgetCreatorBase()
1897 {
1898 }
1899
1900 void KItemListWidgetCreatorBase::recycle(KItemListWidget* widget)
1901 {
1902     widget->setParentItem(0);
1903     widget->setOpacity(1.0);
1904     pushRecycleableWidget(widget);
1905 }
1906
1907 KItemListGroupHeaderCreatorBase::~KItemListGroupHeaderCreatorBase()
1908 {
1909 }
1910
1911 void KItemListGroupHeaderCreatorBase::recycle(KItemListGroupHeader* header)
1912 {
1913     header->setOpacity(1.0);
1914     pushRecycleableWidget(header);
1915 }
1916
1917 #include "kitemlistview.moc"