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 (event->buttons() & Qt::RightButton) {
 311                 // Only clear the selection if a context menu is requested above a non-selected item
 312                 if (!m_selectionManager->selectedItems().contains(m_pressedIndex)) {
 313                     m_selectionManager->setSelectedItems(QSet<int>() << m_pressedIndex);
 314                 }
 315             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 316                 // Select the pressed item and start a new anchored selection
 317                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 318                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 319             }
 320             break;
 321
 322         default:
 323             Q_ASSERT(false);
 324             break;
 325         }
 326
 327         return true;
 328     } else {
 329         if (event->buttons() & Qt::RightButton) {
 330             m_selectionManager->clearSelection();
 331         }
 332
 333         KItemListRubberBand* rubberBand = m_view->rubberBand();
 334         QPointF startPos = m_pressedMousePos;
 335         if (m_view->scrollOrientation() == Qt::Vertical) {
 336             startPos.ry() += m_view->offset();
 337             if (m_view->itemSize().width() < 0) {
 338                 // Use a special rubberband for views that have only one column and
 339                 // expand the rubberband to use the whole width of the view.
 340                 startPos.setX(0);
 341             }
 342         } else {
 343             startPos.rx() += m_view->offset();
 344         }
 345
 346         m_oldSelection = m_selectionManager->selectedItems();
 347         rubberBand->setStartPosition(startPos);
 348         rubberBand->setEndPosition(startPos);
 349         rubberBand->setActive(true);
 350         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 351         m_view->setAutoScroll(true);
 352     }
 353
 354     return false;
 355 }
 356
 357 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 358 {
 359     if (!m_view) {
 360         return false;
 361     }
 362
 363     if (m_pressedIndex >= 0) {
 364         // Check whether a dragging should be started
 365         if (!m_dragging && (event->buttons() & Qt::LeftButton)) {
 366             const QPointF pos = transform.map(event->pos());
 367             const qreal minDragDiff = 4;
 368             const bool hasMinDragDiff = qAbs(pos.x() - m_pressedMousePos.x()) >= minDragDiff ||
 369                                         qAbs(pos.y() - m_pressedMousePos.y()) >= minDragDiff;
 370             if (hasMinDragDiff && startDragging()) {
 371                 m_dragging = true;
 372             }
 373         }
 374     } else {
 375         KItemListRubberBand* rubberBand = m_view->rubberBand();
 376         if (rubberBand->isActive()) {
 377             QPointF endPos = transform.map(event->pos());
 378             if (m_view->scrollOrientation() == Qt::Vertical) {
 379                 endPos.ry() += m_view->offset();
 380                 if (m_view->itemSize().width() < 0) {
 381                     // Use a special rubberband for views that have only one column and
 382                     // expand the rubberband to use the whole width of the view.
 383                     endPos.setX(m_view->size().width());
 384                 }
 385             } else {
 386                 endPos.rx() += m_view->offset();
 387             }
 388             rubberBand->setEndPosition(endPos);
 389         }
 390     }
 391
 392     return false;
 393 }
 394
 395 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 396 {
 397     if (!m_view) {
 398         return false;
 399     }
 400
 401     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 402                                        event->modifiers() & Qt::ControlModifier;
 403
 404     bool clearSelection = !shiftOrControlPressed && !m_dragging && event->button() != Qt::RightButton;
 405
 406     KItemListRubberBand* rubberBand = m_view->rubberBand();
 407     if (rubberBand->isActive()) {
 408         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 409         rubberBand->setActive(false);
 410         m_oldSelection.clear();
 411         m_view->setAutoScroll(false);
 412
 413         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 414             clearSelection = false;
 415         }
 416     }
 417
 418     const QPointF pos = transform.map(event->pos());
 419     const int index = m_view->itemAt(pos);
 420
 421     if (index >= 0 && index == m_pressedIndex) {
 422         // The release event is done above the same item as the press event
 423
 424         if (clearSelection) {
 425             // Clear the previous selection but reselect the current index
 426             m_selectionManager->setSelectedItems(QSet<int>() << index);
 427         }
 428
 429         if (event->button() & Qt::LeftButton) {
 430             bool emitItemActivated = true;
 431             if (m_view->isAboveExpansionToggle(index, pos)) {
 432                 emit itemExpansionToggleClicked(index);
 433                 emitItemActivated = false;
 434             } else if (shiftOrControlPressed) {
 435                 // The mouse click should only update the selection, not trigger the item
 436                 emitItemActivated = false;
 437             } else if (!KGlobalSettings::singleClick()) {
 438                 emitItemActivated = false;
 439             }
 440             if (emitItemActivated) {
 441                 emit itemActivated(index);
 442             }
 443         } else if (event->button() & Qt::MidButton) {
 444             emit itemMiddleClicked(index);
 445         } else if (event->button() & Qt::RightButton) {
 446             emit contextMenuRequested(index, QPointF(event->pos()));
 447         }
 448     } else if (clearSelection) {
 449         m_selectionManager->clearSelection();
 450     }
 451
 452     m_dragging = false;
 453     m_pressedMousePos = QPointF();
 454     m_pressedIndex = -1;
 455     return false;
 456 }
 457
 458 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 459 {
 460     const QPointF pos = transform.map(event->pos());
 461     const int index = m_view->itemAt(pos);
 462
 463     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 464                            (event->button() & Qt::LeftButton) &&
 465                            index >= 0 && index < m_model->count();
 466     if (emitItemActivated) {
 467         emit itemActivated(index);
 468     }
 469     return false;
 470 }
 471
 472 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 473 {
 474     Q_UNUSED(event);
 475     Q_UNUSED(transform);
 476     return false;
 477 }
 478
 479 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 480 {
 481     Q_UNUSED(event);
 482     Q_UNUSED(transform);
 483     return false;
 484 }
 485
 486 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 487 {
 488     Q_UNUSED(event);
 489     Q_UNUSED(transform);
 490     return false;
 491 }
 492
 493 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 494 {
 495     Q_UNUSED(event);
 496     Q_UNUSED(transform);
 497
 498     m_dragging = false;
 499     return false;
 500 }
 501
 502 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 503 {
 504     Q_UNUSED(event);
 505     Q_UNUSED(transform);
 506     return false;
 507 }
 508
 509 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 510 {
 511     // The implementation assumes that only one item can get hovered no matter
 512     // whether they overlap or not.
 513
 514     Q_UNUSED(transform);
 515     if (!m_model || !m_view) {
 516         return false;
 517     }
 518
 519     // Search the previously hovered item that might get unhovered
 520     KItemListWidget* unhoveredWidget = 0;
 521     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 522         if (widget->isHovered()) {
 523             unhoveredWidget = widget;
 524             break;
 525         }
 526     }
 527
 528     // Search the currently hovered item
 529     KItemListWidget* hoveredWidget = 0;
 530     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 531         const QPointF mappedPos = widget->mapFromItem(m_view, event->pos());
 532
 533         const bool hovered = widget->contains(mappedPos) &&
 534                              !widget->expansionToggleRect().contains(mappedPos) &&
 535                              !widget->selectionToggleRect().contains(mappedPos);
 536         if (hovered) {
 537             hoveredWidget = widget;
 538             break;
 539         }
 540     }
 541
 542     if (unhoveredWidget != hoveredWidget) {
 543         if (unhoveredWidget) {
 544             unhoveredWidget->setHovered(false);
 545             emit itemUnhovered(unhoveredWidget->index());
 546         }
 547
 548         if (hoveredWidget) {
 549             hoveredWidget->setHovered(true);
 550             emit itemHovered(hoveredWidget->index());
 551         }
 552     }
 553
 554     return false;
 555 }
 556
 557 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 558 {
 559     Q_UNUSED(event);
 560     Q_UNUSED(transform);
 561
 562     if (!m_model || !m_view) {
 563         return false;
 564     }
 565
 566     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 567         if (widget->isHovered()) {
 568             widget->setHovered(false);
 569             emit itemUnhovered(widget->index());
 570         }
 571     }
 572     return false;
 573 }
 574
 575 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 576 {
 577     Q_UNUSED(event);
 578     Q_UNUSED(transform);
 579     return false;
 580 }
 581
 582 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 583 {
 584     Q_UNUSED(event);
 585     Q_UNUSED(transform);
 586     return false;
 587 }
 588
 589 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 590 {
 591     if (!event) {
 592         return false;
 593     }
 594
 595     switch (event->type()) {
 596     case QEvent::KeyPress:
 597         return keyPressEvent(static_cast<QKeyEvent*>(event));
 598     case QEvent::InputMethod:
 599         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 600     case QEvent::GraphicsSceneMousePress:
 601         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 602     case QEvent::GraphicsSceneMouseMove:
 603         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 604     case QEvent::GraphicsSceneMouseRelease:
 605         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 606     case QEvent::GraphicsSceneMouseDoubleClick:
 607         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 608     case QEvent::GraphicsSceneWheel:
 609          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 610     case QEvent::GraphicsSceneDragEnter:
 611         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 612     case QEvent::GraphicsSceneDragLeave:
 613         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 614     case QEvent::GraphicsSceneDragMove:
 615         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 616     case QEvent::GraphicsSceneDrop:
 617         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 618     case QEvent::GraphicsSceneHoverEnter:
 619         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 620     case QEvent::GraphicsSceneHoverMove:
 621         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 622     case QEvent::GraphicsSceneHoverLeave:
 623         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 624     case QEvent::GraphicsSceneResize:
 625         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 626     default:
 627         break;
 628     }
 629
 630     return false;
 631 }
 632
 633 void KItemListController::slotViewOffsetChanged(qreal current, qreal previous)
 634 {
 635     if (!m_view) {
 636         return;
 637     }
 638
 639     KItemListRubberBand* rubberBand = m_view->rubberBand();
 640     if (rubberBand->isActive()) {
 641         const qreal diff = current - previous;
 642         // TODO: Ideally just QCursor::pos() should be used as
 643         // new end-position but it seems there is no easy way
 644         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 645         // (... or I just missed an easy way to do the mapping)
 646         QPointF endPos = rubberBand->endPosition();
 647         if (m_view->scrollOrientation() == Qt::Vertical) {
 648             endPos.ry() += diff;
 649         } else {
 650             endPos.rx() += diff;
 651         }
 652
 653         rubberBand->setEndPosition(endPos);
 654     }
 655 }
 656
 657 void KItemListController::slotRubberBandChanged()
 658 {
 659     if (!m_view || !m_model || m_model->count() <= 0) {
 660         return;
 661     }
 662
 663     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 664     const QPointF startPos = rubberBand->startPosition();
 665     const QPointF endPos = rubberBand->endPosition();
 666     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 667
 668     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 669     if (scrollVertical) {
 670         rubberBandRect.translate(0, -m_view->offset());
 671     } else {
 672         rubberBandRect.translate(-m_view->offset(), 0);
 673     }
 674
 675     if (!m_oldSelection.isEmpty()) {
 676         // Clear the old selection that was available before the rubberband has
 677         // been activated in case if no Shift- or Control-key are pressed
 678         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 679                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 680         if (!shiftOrControlPressed) {
 681             m_oldSelection.clear();
 682         }
 683     }
 684
 685     QSet<int> selectedItems;
 686
 687     // Select all visible items that intersect with the rubberband
 688     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 689         const int index = widget->index();
 690
 691         const QRectF widgetRect = m_view->itemBoundingRect(index);
 692         if (widgetRect.intersects(rubberBandRect)) {
 693             const QRectF iconRect = widget->iconBoundingRect().translated(widgetRect.topLeft());
 694             const QRectF textRect = widget->textBoundingRect().translated(widgetRect.topLeft());
 695             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 696                 selectedItems.insert(index);
 697             }
 698         }
 699     }
 700
 701     // Select all invisible items that intersect with the rubberband. Instead of
 702     // iterating all items only the area which might be touched by the rubberband
 703     // will be checked.
 704     const bool increaseIndex = scrollVertical ?
 705                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 706
 707     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 708     bool selectionFinished = false;
 709     do {
 710         const QRectF widgetRect = m_view->itemBoundingRect(index);
 711         if (widgetRect.intersects(rubberBandRect)) {
 712             selectedItems.insert(index);
 713         }
 714
 715         if (increaseIndex) {
 716             ++index;
 717             selectionFinished = (index >= m_model->count()) ||
 718                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 719                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 720         } else {
 721             --index;
 722             selectionFinished = (index < 0) ||
 723                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 724                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 725         }
 726     } while (!selectionFinished);
 727
 728     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 729         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 730         // Therefore, the new selection contains:
 731         // 1. All previously selected items which are not inside the rubberband, and
 732         // 2. all items inside the rubberband which have not been selected previously.
 733         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 734     }
 735     else {
 736         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 737     }
 738 }
 739
 740 bool KItemListController::startDragging()
 741 {
 742     if (!m_view || !m_model) {
 743         return false;
 744     }
 745
 746     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 747     QMimeData* data = m_model->createMimeData(selectedItems);
 748     if (!data) {
 749         return false;
 750     }
 751
 752     // The created drag object will be owned and deleted
 753     // by QApplication::activeWindow().
 754     QDrag* drag = new QDrag(QApplication::activeWindow());
 755     drag->setMimeData(data);
 756
 757     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 758     drag->setPixmap(pixmap);
 759
 760     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 761     return true;
 762 }
 763
 764 #include "kitemlistcontroller.moc"