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(changeCurrentItem(QString,bool)),
  52             this, SLOT(slotChangeCurrentItem(QString,bool)));
  53 }
  54
  55 KItemListController::~KItemListController()
  56 {
  57 }
  58
  59 void KItemListController::setModel(KItemModelBase* model)
  60 {
  61     if (m_model == model) {
  62         return;
  63     }
  64
  65     KItemModelBase* oldModel = m_model;
  66     m_model = model;
  67
  68     if (m_view) {
  69         m_view->setModel(m_model);
  70     }
  71
  72     m_selectionManager->setModel(m_model);
  73
  74     emit modelChanged(m_model, oldModel);
  75 }
  76
  77 KItemModelBase* KItemListController::model() const
  78 {
  79     return m_model;
  80 }
  81
  82 KItemListSelectionManager* KItemListController::selectionManager() const
  83 {
  84     return m_selectionManager;
  85 }
  86
  87 void KItemListController::setView(KItemListView* view)
  88 {
  89     if (m_view == view) {
  90         return;
  91     }
  92
  93     KItemListView* oldView = m_view;
  94     if (oldView) {
  95         disconnect(oldView, SIGNAL(offsetChanged(qreal,qreal)), this, SLOT(slotViewOffsetChanged(qreal,qreal)));
  96     }
  97
  98     m_view = view;
  99
 100     if (m_view) {
 101         m_view->setController(this);
 102         m_view->setModel(m_model);
 103         connect(m_view, SIGNAL(offsetChanged(qreal,qreal)), this, SLOT(slotViewOffsetChanged(qreal,qreal)));
 104     }
 105
 106     emit viewChanged(m_view, oldView);
 107 }
 108
 109 KItemListView* KItemListController::view() const
 110 {
 111     return m_view;
 112 }
 113
 114 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 115 {
 116     m_selectionBehavior = behavior;
 117 }
 118
 119 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 120 {
 121     return m_selectionBehavior;
 122 }
 123
 124 bool KItemListController::showEvent(QShowEvent* event)
 125 {
 126     Q_UNUSED(event);
 127     return false;
 128 }
 129
 130 bool KItemListController::hideEvent(QHideEvent* event)
 131 {
 132     Q_UNUSED(event);
 133     return false;
 134 }
 135
 136 bool KItemListController::keyPressEvent(QKeyEvent* event)
 137 {
 138     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 139     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 140     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 141
 142     int index = m_selectionManager->currentItem();
 143     const int itemCount = m_model->count();
 144     const int itemsPerRow = m_view->itemsPerOffset();
 145
 146     // For horizontal scroll orientation, transform
 147     // the arrow keys to simplify the event handling.
 148     int key = event->key();
 149     if (m_view->scrollOrientation() == Qt::Horizontal) {
 150         switch (key) {
 151         case Qt::Key_Up:    key = Qt::Key_Left; break;
 152         case Qt::Key_Down:  key = Qt::Key_Right; break;
 153         case Qt::Key_Left:  key = Qt::Key_Up; break;
 154         case Qt::Key_Right: key = Qt::Key_Down; break;
 155         default:            break;
 156         }
 157     }
 158
 159     switch (key) {
 160     case Qt::Key_Home:
 161         index = 0;
 162         break;
 163
 164     case Qt::Key_End:
 165         index = itemCount - 1;
 166         break;
 167
 168     case Qt::Key_Left:
 169         if (index > 0) {
 170             index--;
 171         }
 172         break;
 173
 174     case Qt::Key_Right:
 175         if (index < itemCount - 1) {
 176             index++;
 177         }
 178         break;
 179
 180     case Qt::Key_Up:
 181         if (index >= itemsPerRow) {
 182             index -= itemsPerRow;
 183         }
 184         break;
 185
 186     case Qt::Key_Down:
 187         if (index + itemsPerRow < itemCount) {
 188             // We are not in the last row yet.
 189             index += itemsPerRow;
 190         }
 191         else {
 192             // We are either in the last row already, or we are in the second-last row,
 193             // and there is no item below the current item.
 194             // In the latter case, we jump to the very last item.
 195             const int currentColumn = index % itemsPerRow;
 196             const int lastItemColumn = (itemCount - 1) % itemsPerRow;
 197             const bool inLastRow = currentColumn < lastItemColumn;
 198             if (!inLastRow) {
 199                 index = itemCount - 1;
 200             }
 201         }
 202         break;
 203
 204     case Qt::Key_Enter:
 205     case Qt::Key_Return:
 206         emit itemActivated(index);
 207         break;
 208
 209     case Qt::Key_Space:
 210         if (controlPressed) {
 211             m_selectionManager->endAnchoredSelection();
 212             m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 213             m_selectionManager->beginAnchoredSelection(index);
 214             break;
 215         }
 216
 217     default:
 218         m_keyboardManager->addKeys(event->text());
 219         return false;
 220     }
 221
 222     if (m_selectionManager->currentItem() != index) {
 223         if (controlPressed) {
 224             m_selectionManager->endAnchoredSelection();
 225         }
 226
 227         m_selectionManager->setCurrentItem(index);
 228
 229         if (!shiftOrControlPressed || m_selectionBehavior == SingleSelection) {
 230             m_selectionManager->clearSelection();
 231             m_selectionManager->setSelected(index, 1);
 232         }
 233
 234         if (!shiftPressed) {
 235             m_selectionManager->beginAnchoredSelection(index);
 236         }
 237     }
 238     return true;
 239 }
 240
 241 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 242 {
 243     if (!m_model) {
 244         return;
 245     }
 246     const int currentIndex = m_selectionManager->currentItem();
 247     int index;
 248     if (searchFromNextItem) {
 249         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 250     }
 251     else {
 252         index = m_model->indexForKeyboardSearch(text, currentIndex);
 253     }
 254     if (index >= 0) {
 255         m_selectionManager->setCurrentItem(index);
 256         m_selectionManager->clearSelection();
 257         m_selectionManager->setSelected(index, 1);
 258         m_selectionManager->beginAnchoredSelection(index);
 259     }
 260 }
 261
 262 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 263 {
 264     Q_UNUSED(event);
 265     return false;
 266 }
 267
 268 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 269 {
 270     if (!m_view) {
 271         return false;
 272     }
 273
 274     m_dragging = false;
 275     m_pressedMousePos = transform.map(event->pos());
 276     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 277
 278     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 279         m_selectionManager->setCurrentItem(m_pressedIndex);
 280         return true;
 281     }
 282
 283     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 284     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 285
 286     if (m_selectionBehavior == SingleSelection) {
 287         m_selectionManager->clearSelection();
 288     }
 289
 290     if (!shiftPressed) {
 291         // Finish the anchored selection before the current index is changed
 292         m_selectionManager->endAnchoredSelection();
 293     }
 294
 295     if (m_pressedIndex >= 0) {
 296         m_selectionManager->setCurrentItem(m_pressedIndex);
 297
 298         switch (m_selectionBehavior) {
 299         case NoSelection:
 300             break;
 301
 302         case SingleSelection:
 303             m_selectionManager->setSelected(m_pressedIndex);
 304             break;
 305
 306         case MultiSelection:
 307             if (controlPressed) {
 308                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 309                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 310             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 311                 // Select the pressed item and start a new anchored selection
 312                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 313                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 314             }
 315             break;
 316
 317         default:
 318             Q_ASSERT(false);
 319             break;
 320         }
 321
 322         return true;
 323     } else {
 324         KItemListRubberBand* rubberBand = m_view->rubberBand();
 325         QPointF startPos = m_pressedMousePos;
 326         if (m_view->scrollOrientation() == Qt::Vertical) {
 327             startPos.ry() += m_view->offset();
 328             if (m_view->itemSize().width() < 0) {
 329                 // Use a special rubberband for views that have only one column and
 330                 // expand the rubberband to use the whole width of the view.
 331                 startPos.setX(0);
 332             }
 333         } else {
 334             startPos.rx() += m_view->offset();
 335         }
 336
 337         m_oldSelection = m_selectionManager->selectedItems();
 338         rubberBand->setStartPosition(startPos);
 339         rubberBand->setEndPosition(startPos);
 340         rubberBand->setActive(true);
 341         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 342         m_view->setAutoScroll(true);
 343     }
 344
 345     return false;
 346 }
 347
 348 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 349 {
 350     if (!m_view) {
 351         return false;
 352     }
 353
 354     if (m_pressedIndex >= 0) {
 355         // Check whether a dragging should be started
 356         if (!m_dragging && (event->buttons() & Qt::LeftButton)) {
 357             const QPointF pos = transform.map(event->pos());
 358             const qreal minDragDiff = 4;
 359             const bool hasMinDragDiff = qAbs(pos.x() - m_pressedMousePos.x()) >= minDragDiff ||
 360                                         qAbs(pos.y() - m_pressedMousePos.y()) >= minDragDiff;
 361             if (hasMinDragDiff && startDragging()) {
 362                 m_dragging = true;
 363             }
 364         }
 365     } else {
 366         KItemListRubberBand* rubberBand = m_view->rubberBand();
 367         if (rubberBand->isActive()) {
 368             QPointF endPos = transform.map(event->pos());
 369             if (m_view->scrollOrientation() == Qt::Vertical) {
 370                 endPos.ry() += m_view->offset();
 371                 if (m_view->itemSize().width() < 0) {
 372                     // Use a special rubberband for views that have only one column and
 373                     // expand the rubberband to use the whole width of the view.
 374                     endPos.setX(m_view->size().width());
 375                 }
 376             } else {
 377                 endPos.rx() += m_view->offset();
 378             }
 379             rubberBand->setEndPosition(endPos);
 380         }
 381     }
 382
 383     return false;
 384 }
 385
 386 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 387 {
 388     if (!m_view) {
 389         return false;
 390     }
 391
 392     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 393                                        event->modifiers() & Qt::ControlModifier;
 394
 395     bool clearSelection = !shiftOrControlPressed && !m_dragging && !(event->button() == Qt::RightButton);
 396
 397     KItemListRubberBand* rubberBand = m_view->rubberBand();
 398     if (rubberBand->isActive()) {
 399         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 400         rubberBand->setActive(false);
 401         m_oldSelection.clear();
 402         m_view->setAutoScroll(false);
 403
 404         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 405             clearSelection = false;
 406         }
 407     }
 408
 409     const QPointF pos = transform.map(event->pos());
 410     const int index = m_view->itemAt(pos);
 411
 412     if (index >= 0 && index == m_pressedIndex) {
 413         // The release event is done above the same item as the press event
 414
 415         if (clearSelection) {
 416             // Clear the previous selection but reselect the current index
 417             m_selectionManager->setSelectedItems(QSet<int>() << index);
 418         }
 419
 420         if (event->button() & Qt::LeftButton) {
 421             bool emitItemActivated = true;
 422             if (m_view->isAboveExpansionToggle(index, pos)) {
 423                 emit itemExpansionToggleClicked(index);
 424                 emitItemActivated = false;
 425             } else if (shiftOrControlPressed) {
 426                 // The mouse click should only update the selection, not trigger the item
 427                 emitItemActivated = false;
 428             } else if (!KGlobalSettings::singleClick()) {
 429                 emitItemActivated = false;
 430             }
 431             if (emitItemActivated) {
 432                 emit itemActivated(index);
 433             }
 434         } else if (event->button() & Qt::MidButton) {
 435             emit itemMiddleClicked(index);
 436         } else if (event->button() & Qt::RightButton) {
 437             emit contextMenuRequested(index, QPointF(event->pos()));
 438         }
 439     } else if (clearSelection) {
 440         m_selectionManager->clearSelection();
 441     }
 442
 443     m_dragging = false;
 444     m_pressedMousePos = QPointF();
 445     m_pressedIndex = -1;
 446     return false;
 447 }
 448
 449 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 450 {
 451     const QPointF pos = transform.map(event->pos());
 452     const int index = m_view->itemAt(pos);
 453
 454     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 455                            (event->button() & Qt::LeftButton) &&
 456                            index >= 0 && index < m_model->count();
 457     if (emitItemActivated) {
 458         emit itemActivated(index);
 459     }
 460     return false;
 461 }
 462
 463 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 464 {
 465     Q_UNUSED(event);
 466     Q_UNUSED(transform);
 467     return false;
 468 }
 469
 470 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 471 {
 472     Q_UNUSED(event);
 473     Q_UNUSED(transform);
 474     return false;
 475 }
 476
 477 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 478 {
 479     Q_UNUSED(event);
 480     Q_UNUSED(transform);
 481     return false;
 482 }
 483
 484 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 485 {
 486     Q_UNUSED(event);
 487     Q_UNUSED(transform);
 488
 489     m_dragging = false;
 490     return false;
 491 }
 492
 493 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 494 {
 495     Q_UNUSED(event);
 496     Q_UNUSED(transform);
 497     return false;
 498 }
 499
 500 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 501 {
 502     // The implementation assumes that only one item can get hovered no matter
 503     // whether they overlap or not.
 504
 505     Q_UNUSED(transform);
 506     if (!m_model || !m_view) {
 507         return false;
 508     }
 509
 510     // Search the previously hovered item that might get unhovered
 511     KItemListWidget* unhoveredWidget = 0;
 512     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 513         if (widget->isHovered()) {
 514             unhoveredWidget = widget;
 515             break;
 516         }
 517     }
 518
 519     // Search the currently hovered item
 520     KItemListWidget* hoveredWidget = 0;
 521     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 522         const QPointF mappedPos = widget->mapFromItem(m_view, event->pos());
 523
 524         const bool hovered = widget->contains(mappedPos) &&
 525                              !widget->expansionToggleRect().contains(mappedPos) &&
 526                              !widget->selectionToggleRect().contains(mappedPos);
 527         if (hovered) {
 528             hoveredWidget = widget;
 529             break;
 530         }
 531     }
 532
 533     if (unhoveredWidget != hoveredWidget) {
 534         if (unhoveredWidget) {
 535             unhoveredWidget->setHovered(false);
 536             emit itemUnhovered(unhoveredWidget->index());
 537         }
 538
 539         if (hoveredWidget) {
 540             hoveredWidget->setHovered(true);
 541             emit itemHovered(hoveredWidget->index());
 542         }
 543     }
 544
 545     return false;
 546 }
 547
 548 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 549 {
 550     Q_UNUSED(event);
 551     Q_UNUSED(transform);
 552
 553     if (!m_model || !m_view) {
 554         return false;
 555     }
 556
 557     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 558         if (widget->isHovered()) {
 559             widget->setHovered(false);
 560             emit itemUnhovered(widget->index());
 561         }
 562     }
 563     return false;
 564 }
 565
 566 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 567 {
 568     Q_UNUSED(event);
 569     Q_UNUSED(transform);
 570     return false;
 571 }
 572
 573 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 574 {
 575     Q_UNUSED(event);
 576     Q_UNUSED(transform);
 577     return false;
 578 }
 579
 580 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 581 {
 582     if (!event) {
 583         return false;
 584     }
 585
 586     switch (event->type()) {
 587     case QEvent::KeyPress:
 588         return keyPressEvent(static_cast<QKeyEvent*>(event));
 589     case QEvent::InputMethod:
 590         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 591     case QEvent::GraphicsSceneMousePress:
 592         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 593     case QEvent::GraphicsSceneMouseMove:
 594         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 595     case QEvent::GraphicsSceneMouseRelease:
 596         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 597     case QEvent::GraphicsSceneMouseDoubleClick:
 598         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 599     case QEvent::GraphicsSceneWheel:
 600          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 601     case QEvent::GraphicsSceneDragEnter:
 602         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 603     case QEvent::GraphicsSceneDragLeave:
 604         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 605     case QEvent::GraphicsSceneDragMove:
 606         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 607     case QEvent::GraphicsSceneDrop:
 608         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 609     case QEvent::GraphicsSceneHoverEnter:
 610         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 611     case QEvent::GraphicsSceneHoverMove:
 612         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 613     case QEvent::GraphicsSceneHoverLeave:
 614         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 615     case QEvent::GraphicsSceneResize:
 616         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 617     default:
 618         break;
 619     }
 620
 621     return false;
 622 }
 623
 624 void KItemListController::slotViewOffsetChanged(qreal current, qreal previous)
 625 {
 626     if (!m_view) {
 627         return;
 628     }
 629
 630     KItemListRubberBand* rubberBand = m_view->rubberBand();
 631     if (rubberBand->isActive()) {
 632         const qreal diff = current - previous;
 633         // TODO: Ideally just QCursor::pos() should be used as
 634         // new end-position but it seems there is no easy way
 635         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 636         // (... or I just missed an easy way to do the mapping)
 637         QPointF endPos = rubberBand->endPosition();
 638         if (m_view->scrollOrientation() == Qt::Vertical) {
 639             endPos.ry() += diff;
 640         } else {
 641             endPos.rx() += diff;
 642         }
 643
 644         rubberBand->setEndPosition(endPos);
 645     }
 646 }
 647
 648 void KItemListController::slotRubberBandChanged()
 649 {
 650     if (!m_view || !m_model || m_model->count() <= 0) {
 651         return;
 652     }
 653
 654     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 655     const QPointF startPos = rubberBand->startPosition();
 656     const QPointF endPos = rubberBand->endPosition();
 657     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 658
 659     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 660     if (scrollVertical) {
 661         rubberBandRect.translate(0, -m_view->offset());
 662     } else {
 663         rubberBandRect.translate(-m_view->offset(), 0);
 664     }
 665
 666     if (!m_oldSelection.isEmpty()) {
 667         // Clear the old selection that was available before the rubberband has
 668         // been activated in case if no Shift- or Control-key are pressed
 669         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 670                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 671         if (!shiftOrControlPressed) {
 672             m_oldSelection.clear();
 673         }
 674     }
 675
 676     QSet<int> selectedItems;
 677
 678     // Select all visible items that intersect with the rubberband
 679     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 680         const int index = widget->index();
 681
 682         const QRectF widgetRect = m_view->itemBoundingRect(index);
 683         if (widgetRect.intersects(rubberBandRect)) {
 684             const QRectF iconRect = widget->iconBoundingRect().translated(widgetRect.topLeft());
 685             const QRectF textRect = widget->textBoundingRect().translated(widgetRect.topLeft());
 686             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 687                 selectedItems.insert(index);
 688             }
 689         }
 690     }
 691
 692     // Select all invisible items that intersect with the rubberband. Instead of
 693     // iterating all items only the area which might be touched by the rubberband
 694     // will be checked.
 695     const bool increaseIndex = scrollVertical ?
 696                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 697
 698     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 699     bool selectionFinished = false;
 700     do {
 701         const QRectF widgetRect = m_view->itemBoundingRect(index);
 702         if (widgetRect.intersects(rubberBandRect)) {
 703             selectedItems.insert(index);
 704         }
 705
 706         if (increaseIndex) {
 707             ++index;
 708             selectionFinished = (index >= m_model->count()) ||
 709                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 710                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 711         } else {
 712             --index;
 713             selectionFinished = (index < 0) ||
 714                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 715                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 716         }
 717     } while (!selectionFinished);
 718
 719     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 720         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 721         // Therefore, the new selection contains:
 722         // 1. All previously selected items which are not inside the rubberband, and
 723         // 2. all items inside the rubberband which have not been selected previously.
 724         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 725     }
 726     else {
 727         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 728     }
 729 }
 730
 731 bool KItemListController::startDragging()
 732 {
 733     if (!m_view || !m_model) {
 734         return false;
 735     }
 736
 737     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 738     QMimeData* data = m_model->createMimeData(selectedItems);
 739     if (!data) {
 740         return false;
 741     }
 742
 743     // The created drag object will be owned and deleted
 744     // by QApplication::activeWindow().
 745     QDrag* drag = new QDrag(QApplication::activeWindow());
 746     drag->setMimeData(data);
 747
 748     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 749     drag->setPixmap(pixmap);
 750
 751     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 752     return true;
 753 }
 754
 755 #include "kitemlistcontroller.moc"