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