src/kitemviews/kitemlistcontroller.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 "kitemlistcontroller.h"
  24
  25 #include "kitemlistview.h"
  26 #include "kitemlistrubberband_p.h"
  27 #include "kitemlistselectionmanager.h"
  28 #include "kitemlistkeyboardsearchmanager_p.h"
  29
  30 #include <QApplication>
  31 #include <QDrag>
  32 #include <QEvent>
  33 #include <QGraphicsSceneEvent>
  34 #include <QMimeData>
  35
  36 #include <KGlobalSettings>
  37 #include <KDebug>
  38
  39 KItemListController::KItemListController(QObject* parent) :
  40     QObject(parent),
  41     m_dragging(false),
  42     m_selectionBehavior(NoSelection),
  43     m_model(0),
  44     m_view(0),
  45     m_selectionManager(new KItemListSelectionManager(this)),
  46     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  47     m_pressedIndex(-1),
  48     m_pressedMousePos(),
  49     m_oldSelection()
  50 {
  51     connect(m_keyboardManager, SIGNAL(requestItemActivation(QString,bool)), this, SLOT(slotKeyboardActivationRequested(QString,bool)));
  52 }
  53
  54 KItemListController::~KItemListController()
  55 {
  56 }
  57
  58 void KItemListController::setModel(KItemModelBase* model)
  59 {
  60     if (m_model == model) {
  61         return;
  62     }
  63
  64     KItemModelBase* oldModel = m_model;
  65     m_model = model;
  66
  67     if (m_view) {
  68         m_view->setModel(m_model);
  69     }
  70
  71     m_selectionManager->setModel(m_model);
  72
  73     emit modelChanged(m_model, oldModel);
  74 }
  75
  76 KItemModelBase* KItemListController::model() const
  77 {
  78     return m_model;
  79 }
  80
  81 KItemListSelectionManager* KItemListController::selectionManager() const
  82 {
  83     return m_selectionManager;
  84 }
  85
  86 void KItemListController::setView(KItemListView* view)
  87 {
  88     if (m_view == view) {
  89         return;
  90     }
  91
  92     KItemListView* oldView = m_view;
  93     if (oldView) {
  94         disconnect(oldView, SIGNAL(offsetChanged(qreal,qreal)), this, SLOT(slotViewOffsetChanged(qreal,qreal)));
  95     }
  96
  97     m_view = view;
  98
  99     if (m_view) {
 100         m_view->setController(this);
 101         m_view->setModel(m_model);
 102         connect(m_view, SIGNAL(offsetChanged(qreal,qreal)), this, SLOT(slotViewOffsetChanged(qreal,qreal)));
 103     }
 104
 105     emit viewChanged(m_view, oldView);
 106 }
 107
 108 KItemListView* KItemListController::view() const
 109 {
 110     return m_view;
 111 }
 112
 113 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 114 {
 115     m_selectionBehavior = behavior;
 116 }
 117
 118 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 119 {
 120     return m_selectionBehavior;
 121 }
 122
 123 bool KItemListController::showEvent(QShowEvent* event)
 124 {
 125     Q_UNUSED(event);
 126     return false;
 127 }
 128
 129 bool KItemListController::hideEvent(QHideEvent* event)
 130 {
 131     Q_UNUSED(event);
 132     return false;
 133 }
 134
 135 bool KItemListController::keyPressEvent(QKeyEvent* event)
 136 {
 137     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 138     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 139     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 140
 141     int index = m_selectionManager->currentItem();
 142     const int itemCount = m_model->count();
 143     const int itemsPerRow = m_view->itemsPerOffset();
 144
 145     // For horizontal scroll orientation, transform
 146     // the arrow keys to simplify the event handling.
 147     int key = event->key();
 148     if (m_view->scrollOrientation() == Qt::Horizontal) {
 149         switch (key) {
 150         case Qt::Key_Up:    key = Qt::Key_Left; break;
 151         case Qt::Key_Down:  key = Qt::Key_Right; break;
 152         case Qt::Key_Left:  key = Qt::Key_Up; break;
 153         case Qt::Key_Right: key = Qt::Key_Down; break;
 154         default:            break;
 155         }
 156     }
 157
 158     switch (key) {
 159     case Qt::Key_Home:
 160         index = 0;
 161         break;
 162
 163     case Qt::Key_End:
 164         index = itemCount - 1;
 165         break;
 166
 167     case Qt::Key_Left:
 168         if (index > 0) {
 169             index--;
 170         }
 171         break;
 172
 173     case Qt::Key_Right:
 174         if (index < itemCount - 1) {
 175             index++;
 176         }
 177         break;
 178
 179     case Qt::Key_Up:
 180         if (index >= itemsPerRow) {
 181             index -= itemsPerRow;
 182         }
 183         break;
 184
 185     case Qt::Key_Down:
 186         if (index + itemsPerRow < itemCount) {
 187             // We are not in the last row yet.
 188             index += itemsPerRow;
 189         }
 190         else {
 191             // We are either in the last row already, or we are in the second-last row,
 192             // and there is no item below the current item.
 193             // In the latter case, we jump to the very last item.
 194             const int currentColumn = index % itemsPerRow;
 195             const int lastItemColumn = (itemCount - 1) % itemsPerRow;
 196             const bool inLastRow = currentColumn < lastItemColumn;
 197             if (!inLastRow) {
 198                 index = itemCount - 1;
 199             }
 200         }
 201         break;
 202
 203     case Qt::Key_Space:
 204         if (controlPressed) {
 205             m_selectionManager->endAnchoredSelection();
 206             m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 207             m_selectionManager->beginAnchoredSelection(index);
 208             break;
 209         }
 210
 211     default:
 212         m_keyboardManager->addKeys(event->text());
 213         return false;
 214     }
 215
 216     if (m_selectionManager->currentItem() != index) {
 217         if (controlPressed) {
 218             m_selectionManager->endAnchoredSelection();
 219         }
 220
 221         m_selectionManager->setCurrentItem(index);
 222
 223         if (!shiftOrControlPressed || m_selectionBehavior == SingleSelection) {
 224             m_selectionManager->clearSelection();
 225             m_selectionManager->setSelected(index, 1);
 226         }
 227
 228         if (!shiftPressed) {
 229             m_selectionManager->beginAnchoredSelection(index);
 230         }
 231     }
 232     return true;
 233 }
 234
 235 void KItemListController::slotKeyboardActivationRequested(const QString& text, bool searchFromNextItem)
 236 {
 237     if (!m_model) {
 238         return;
 239     }
 240     const int currentIndex = m_selectionManager->currentItem();
 241     int index;
 242     if (searchFromNextItem) {
 243          index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 244     }
 245     else {
 246         index = m_model->indexForKeyboardSearch(text, currentIndex);
 247     }
 248     if (index >= 0) {
 249         m_selectionManager->setCurrentItem(index);
 250         m_selectionManager->clearSelection();
 251         m_selectionManager->setSelected(index, 1);
 252         m_selectionManager->beginAnchoredSelection(index);
 253     }
 254 }
 255
 256 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 257 {
 258     Q_UNUSED(event);
 259     return false;
 260 }
 261
 262 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 263 {
 264     if (!m_view) {
 265         return false;
 266     }
 267
 268     m_dragging = false;
 269     m_pressedMousePos = transform.map(event->pos());
 270     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 271
 272     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 273         m_selectionManager->setCurrentItem(m_pressedIndex);
 274         return true;
 275     }
 276
 277     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 278     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 279
 280     if (m_selectionBehavior == SingleSelection) {
 281         m_selectionManager->clearSelection();
 282     }
 283
 284     if (!shiftPressed) {
 285         // Finish the anchored selection before the current index is changed
 286         m_selectionManager->endAnchoredSelection();
 287     }
 288
 289     if (m_pressedIndex >= 0) {
 290         m_selectionManager->setCurrentItem(m_pressedIndex);
 291
 292         switch (m_selectionBehavior) {
 293         case NoSelection:
 294             break;
 295
 296         case SingleSelection:
 297             m_selectionManager->setSelected(m_pressedIndex);
 298             break;
 299
 300         case MultiSelection:
 301             if (controlPressed) {
 302                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 303                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 304             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 305                 // Select the pressed item and start a new anchored selection
 306                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 307                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 308             }
 309             break;
 310
 311         default:
 312             Q_ASSERT(false);
 313             break;
 314         }
 315
 316         return true;
 317     } else {
 318         KItemListRubberBand* rubberBand = m_view->rubberBand();
 319         QPointF startPos = m_pressedMousePos;
 320         if (m_view->scrollOrientation() == Qt::Vertical) {
 321             startPos.ry() += m_view->offset();
 322             if (m_view->itemSize().width() < 0) {
 323                 // Use a special rubberband for views that have only one column and
 324                 // expand the rubberband to use the whole width of the view.
 325                 startPos.setX(0);
 326             }
 327         } else {
 328             startPos.rx() += m_view->offset();
 329         }
 330
 331         m_oldSelection = m_selectionManager->selectedItems();
 332         rubberBand->setStartPosition(startPos);
 333         rubberBand->setEndPosition(startPos);
 334         rubberBand->setActive(true);
 335         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 336         m_view->setAutoScroll(true);
 337     }
 338
 339     return false;
 340 }
 341
 342 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 343 {
 344     if (!m_view) {
 345         return false;
 346     }
 347
 348     if (m_pressedIndex >= 0) {
 349         // Check whether a dragging should be started
 350         if (!m_dragging && (event->buttons() & Qt::LeftButton)) {
 351             const QPointF pos = transform.map(event->pos());
 352             const qreal minDragDiff = 4;
 353             const bool hasMinDragDiff = qAbs(pos.x() - m_pressedMousePos.x()) >= minDragDiff ||
 354                                         qAbs(pos.y() - m_pressedMousePos.y()) >= minDragDiff;
 355             if (hasMinDragDiff && startDragging()) {
 356                 m_dragging = true;
 357             }
 358         }
 359     } else {
 360         KItemListRubberBand* rubberBand = m_view->rubberBand();
 361         if (rubberBand->isActive()) {
 362             QPointF endPos = transform.map(event->pos());
 363             if (m_view->scrollOrientation() == Qt::Vertical) {
 364                 endPos.ry() += m_view->offset();
 365                 if (m_view->itemSize().width() < 0) {
 366                     // Use a special rubberband for views that have only one column and
 367                     // expand the rubberband to use the whole width of the view.
 368                     endPos.setX(m_view->size().width());
 369                 }
 370             } else {
 371                 endPos.rx() += m_view->offset();
 372             }
 373             rubberBand->setEndPosition(endPos);
 374         }
 375     }
 376
 377     return false;
 378 }
 379
 380 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 381 {
 382     if (!m_view) {
 383         return false;
 384     }
 385
 386     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 387                                        event->modifiers() & Qt::ControlModifier;
 388
 389     bool clearSelection = !shiftOrControlPressed && !m_dragging && !(event->button() == Qt::RightButton);
 390
 391     KItemListRubberBand* rubberBand = m_view->rubberBand();
 392     if (rubberBand->isActive()) {
 393         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 394         rubberBand->setActive(false);
 395         m_oldSelection.clear();
 396         m_view->setAutoScroll(false);
 397
 398         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 399             clearSelection = false;
 400         }
 401     }
 402
 403     const QPointF pos = transform.map(event->pos());
 404     const int index = m_view->itemAt(pos);
 405
 406     if (index >= 0 && index == m_pressedIndex) {
 407         // The release event is done above the same item as the press event
 408
 409         if (clearSelection) {
 410             // Clear the previous selection but reselect the current index
 411             m_selectionManager->setSelectedItems(QSet<int>() << index);
 412         }
 413
 414         bool emitItemClicked = true;
 415         if (event->button() & Qt::LeftButton) {
 416             if (m_view->isAboveExpansionToggle(index, pos)) {
 417                 emit itemExpansionToggleClicked(index);
 418                 emitItemClicked = false;
 419             } else if (shiftOrControlPressed || !KGlobalSettings::singleClick()) {
 420                 emitItemClicked = false;
 421             }
 422         }
 423
 424         if (emitItemClicked) {
 425             emit itemClicked(index, event->button());
 426         }
 427     } else if (clearSelection) {
 428         m_selectionManager->clearSelection();
 429     }
 430
 431     m_dragging = false;
 432     m_pressedMousePos = QPointF();
 433     m_pressedIndex = -1;
 434     return false;
 435 }
 436
 437 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 438 {
 439     const QPointF pos = transform.map(event->pos());
 440     const int index = m_view->itemAt(pos);
 441
 442     bool emitItemClicked = !KGlobalSettings::singleClick() &&
 443                            (event->button() & Qt::LeftButton) &&
 444                            index >= 0 && index < m_model->count();
 445     if (emitItemClicked) {
 446         emit itemClicked(index, event->button());
 447     }
 448     return false;
 449 }
 450
 451 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 452 {
 453     Q_UNUSED(event);
 454     Q_UNUSED(transform);
 455     return false;
 456 }
 457
 458 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 459 {
 460     Q_UNUSED(event);
 461     Q_UNUSED(transform);
 462     return false;
 463 }
 464
 465 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 466 {
 467     Q_UNUSED(event);
 468     Q_UNUSED(transform);
 469     return false;
 470 }
 471
 472 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 473 {
 474     Q_UNUSED(event);
 475     Q_UNUSED(transform);
 476
 477     m_dragging = false;
 478     return false;
 479 }
 480
 481 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 482 {
 483     Q_UNUSED(event);
 484     Q_UNUSED(transform);
 485     return false;
 486 }
 487
 488 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 489 {
 490     // The implementation assumes that only one item can get hovered no matter
 491     // whether they overlap or not.
 492
 493     Q_UNUSED(transform);
 494     if (!m_model || !m_view) {
 495         return false;
 496     }
 497
 498     // Search the previously hovered item that might get unhovered
 499     KItemListWidget* unhoveredWidget = 0;
 500     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 501         if (widget->isHovered()) {
 502             unhoveredWidget = widget;
 503             break;
 504         }
 505     }
 506
 507     // Search the currently hovered item
 508     KItemListWidget* hoveredWidget = 0;
 509     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 510         const QPointF mappedPos = widget->mapFromItem(m_view, event->pos());
 511
 512         const bool hovered = widget->contains(mappedPos) &&
 513                              !widget->expansionToggleRect().contains(mappedPos) &&
 514                              !widget->selectionToggleRect().contains(mappedPos);
 515         if (hovered) {
 516             hoveredWidget = widget;
 517             break;
 518         }
 519     }
 520
 521     if (unhoveredWidget != hoveredWidget) {
 522         if (unhoveredWidget) {
 523             unhoveredWidget->setHovered(false);
 524             emit itemUnhovered(unhoveredWidget->index());
 525         }
 526
 527         if (hoveredWidget) {
 528             hoveredWidget->setHovered(true);
 529             emit itemHovered(hoveredWidget->index());
 530         }
 531     }
 532
 533     return false;
 534 }
 535
 536 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 537 {
 538     Q_UNUSED(event);
 539     Q_UNUSED(transform);
 540
 541     if (!m_model || !m_view) {
 542         return false;
 543     }
 544
 545     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 546         if (widget->isHovered()) {
 547             widget->setHovered(false);
 548             emit itemUnhovered(widget->index());
 549         }
 550     }
 551     return false;
 552 }
 553
 554 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 555 {
 556     Q_UNUSED(event);
 557     Q_UNUSED(transform);
 558     return false;
 559 }
 560
 561 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 562 {
 563     Q_UNUSED(event);
 564     Q_UNUSED(transform);
 565     return false;
 566 }
 567
 568 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 569 {
 570     if (!event) {
 571         return false;
 572     }
 573
 574     switch (event->type()) {
 575     case QEvent::KeyPress:
 576         return keyPressEvent(static_cast<QKeyEvent*>(event));
 577     case QEvent::InputMethod:
 578         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 579     case QEvent::GraphicsSceneMousePress:
 580         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 581     case QEvent::GraphicsSceneMouseMove:
 582         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 583     case QEvent::GraphicsSceneMouseRelease:
 584         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 585     case QEvent::GraphicsSceneMouseDoubleClick:
 586         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 587     case QEvent::GraphicsSceneWheel:
 588          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 589     case QEvent::GraphicsSceneDragEnter:
 590         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 591     case QEvent::GraphicsSceneDragLeave:
 592         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 593     case QEvent::GraphicsSceneDragMove:
 594         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 595     case QEvent::GraphicsSceneDrop:
 596         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 597     case QEvent::GraphicsSceneHoverEnter:
 598         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 599     case QEvent::GraphicsSceneHoverMove:
 600         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 601     case QEvent::GraphicsSceneHoverLeave:
 602         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 603     case QEvent::GraphicsSceneResize:
 604         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 605     default:
 606         break;
 607     }
 608
 609     return false;
 610 }
 611
 612 void KItemListController::slotViewOffsetChanged(qreal current, qreal previous)
 613 {
 614     if (!m_view) {
 615         return;
 616     }
 617
 618     KItemListRubberBand* rubberBand = m_view->rubberBand();
 619     if (rubberBand->isActive()) {
 620         const qreal diff = current - previous;
 621         // TODO: Ideally just QCursor::pos() should be used as
 622         // new end-position but it seems there is no easy way
 623         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 624         // (... or I just missed an easy way to do the mapping)
 625         QPointF endPos = rubberBand->endPosition();
 626         if (m_view->scrollOrientation() == Qt::Vertical) {
 627             endPos.ry() += diff;
 628         } else {
 629             endPos.rx() += diff;
 630         }
 631
 632         rubberBand->setEndPosition(endPos);
 633     }
 634 }
 635
 636 void KItemListController::slotRubberBandChanged()
 637 {
 638     if (!m_view || !m_model || m_model->count() <= 0) {
 639         return;
 640     }
 641
 642     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 643     const QPointF startPos = rubberBand->startPosition();
 644     const QPointF endPos = rubberBand->endPosition();
 645     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 646
 647     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 648     if (scrollVertical) {
 649         rubberBandRect.translate(0, -m_view->offset());
 650     } else {
 651         rubberBandRect.translate(-m_view->offset(), 0);
 652     }
 653
 654     if (!m_oldSelection.isEmpty()) {
 655         // Clear the old selection that was available before the rubberband has
 656         // been activated in case if no Shift- or Control-key are pressed
 657         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 658                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 659         if (!shiftOrControlPressed) {
 660             m_oldSelection.clear();
 661         }
 662     }
 663
 664     QSet<int> selectedItems;
 665
 666     // Select all visible items that intersect with the rubberband
 667     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 668         const int index = widget->index();
 669
 670         const QRectF widgetRect = m_view->itemBoundingRect(index);
 671         if (widgetRect.intersects(rubberBandRect)) {
 672             const QRectF iconRect = widget->iconBoundingRect().translated(widgetRect.topLeft());
 673             const QRectF textRect = widget->textBoundingRect().translated(widgetRect.topLeft());
 674             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 675                 selectedItems.insert(index);
 676             }
 677         }
 678     }
 679
 680     // Select all invisible items that intersect with the rubberband. Instead of
 681     // iterating all items only the area which might be touched by the rubberband
 682     // will be checked.
 683     const bool increaseIndex = scrollVertical ?
 684                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 685
 686     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 687     bool selectionFinished = false;
 688     do {
 689         const QRectF widgetRect = m_view->itemBoundingRect(index);
 690         if (widgetRect.intersects(rubberBandRect)) {
 691             selectedItems.insert(index);
 692         }
 693
 694         if (increaseIndex) {
 695             ++index;
 696             selectionFinished = (index >= m_model->count()) ||
 697                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 698                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 699         } else {
 700             --index;
 701             selectionFinished = (index < 0) ||
 702                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 703                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 704         }
 705     } while (!selectionFinished);
 706
 707     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 708         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 709         // Therefore, the new selection contains:
 710         // 1. All previously selected items which are not inside the rubberband, and
 711         // 2. all items inside the rubberband which have not been selected previously.
 712         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 713     }
 714     else {
 715         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 716     }
 717 }
 718
 719 bool KItemListController::startDragging()
 720 {
 721     if (!m_view || !m_model) {
 722         return false;
 723     }
 724
 725     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 726     QMimeData* data = m_model->createMimeData(selectedItems);
 727     if (!data) {
 728         return false;
 729     }
 730
 731     // The created drag object will be owned and deleted
 732     // by QApplication::activeWindow().
 733     QDrag* drag = new QDrag(QApplication::activeWindow());
 734     drag->setMimeData(data);
 735
 736     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 737     drag->setPixmap(pixmap);
 738
 739     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 740     return true;
 741 }
 742
 743 #include "kitemlistcontroller.moc"