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_selectionBehavior(NoSelection),
  42     m_model(0),
  43     m_view(0),
  44     m_selectionManager(new KItemListSelectionManager(this)),
  45     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  46     m_pressedIndex(-1),
  47     m_pressedMousePos(),
  48     m_oldSelection()
  49 {
  50     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
  51             this, SLOT(slotChangeCurrentItem(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::slotChangeCurrentItem(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_pressedMousePos = transform.map(event->pos());
 274     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 275
 276     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 277         m_selectionManager->setCurrentItem(m_pressedIndex);
 278         return true;
 279     }
 280
 281     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 282     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 283
 284     if (m_selectionBehavior == SingleSelection) {
 285         m_selectionManager->clearSelection();
 286     }
 287
 288     if (!shiftPressed) {
 289         // Finish the anchored selection before the current index is changed
 290         m_selectionManager->endAnchoredSelection();
 291     }
 292
 293     if (m_pressedIndex >= 0) {
 294         m_selectionManager->setCurrentItem(m_pressedIndex);
 295
 296         switch (m_selectionBehavior) {
 297         case NoSelection:
 298             break;
 299
 300         case SingleSelection:
 301             m_selectionManager->setSelected(m_pressedIndex);
 302             break;
 303
 304         case MultiSelection:
 305             if (controlPressed) {
 306                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 307                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 308             } else if (event->buttons() & Qt::RightButton) {
 309                 // Only clear the selection if a context menu is requested above a non-selected item
 310                 if (!m_selectionManager->selectedItems().contains(m_pressedIndex)) {
 311                     m_selectionManager->setSelectedItems(QSet<int>() << m_pressedIndex);
 312                 }
 313             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 314                 // Select the pressed item and start a new anchored selection
 315                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 316                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 317             }
 318             break;
 319
 320         default:
 321             Q_ASSERT(false);
 322             break;
 323         }
 324
 325         return true;
 326     } else {
 327         if (event->buttons() & Qt::RightButton) {
 328             m_selectionManager->clearSelection();
 329         }
 330
 331         KItemListRubberBand* rubberBand = m_view->rubberBand();
 332         QPointF startPos = m_pressedMousePos;
 333         if (m_view->scrollOrientation() == Qt::Vertical) {
 334             startPos.ry() += m_view->offset();
 335             if (m_view->itemSize().width() < 0) {
 336                 // Use a special rubberband for views that have only one column and
 337                 // expand the rubberband to use the whole width of the view.
 338                 startPos.setX(0);
 339             }
 340         } else {
 341             startPos.rx() += m_view->offset();
 342         }
 343
 344         m_oldSelection = m_selectionManager->selectedItems();
 345         rubberBand->setStartPosition(startPos);
 346         rubberBand->setEndPosition(startPos);
 347         rubberBand->setActive(true);
 348         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 349         m_view->setAutoScroll(true);
 350     }
 351
 352     return false;
 353 }
 354
 355 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 356 {
 357     if (!m_view) {
 358         return false;
 359     }
 360
 361     if (m_pressedIndex >= 0) {
 362         // Check whether a dragging should be started
 363         if (event->buttons() & Qt::LeftButton) {
 364             const QPointF pos = transform.map(event->pos());
 365             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 366                 startDragging();
 367             }
 368         }
 369     } else {
 370         KItemListRubberBand* rubberBand = m_view->rubberBand();
 371         if (rubberBand->isActive()) {
 372             QPointF endPos = transform.map(event->pos());
 373             if (m_view->scrollOrientation() == Qt::Vertical) {
 374                 endPos.ry() += m_view->offset();
 375                 if (m_view->itemSize().width() < 0) {
 376                     // Use a special rubberband for views that have only one column and
 377                     // expand the rubberband to use the whole width of the view.
 378                     endPos.setX(m_view->size().width());
 379                 }
 380             } else {
 381                 endPos.rx() += m_view->offset();
 382             }
 383             rubberBand->setEndPosition(endPos);
 384         }
 385     }
 386
 387     return false;
 388 }
 389
 390 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 391 {
 392     if (!m_view) {
 393         return false;
 394     }
 395
 396     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 397                                        event->modifiers() & Qt::ControlModifier;
 398
 399     bool clearSelection = !shiftOrControlPressed && event->button() != Qt::RightButton;
 400
 401     KItemListRubberBand* rubberBand = m_view->rubberBand();
 402     if (rubberBand->isActive()) {
 403         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 404         rubberBand->setActive(false);
 405         m_oldSelection.clear();
 406         m_view->setAutoScroll(false);
 407
 408         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 409             clearSelection = false;
 410         }
 411     }
 412
 413     const QPointF pos = transform.map(event->pos());
 414     const int index = m_view->itemAt(pos);
 415
 416     if (index >= 0 && index == m_pressedIndex) {
 417         // The release event is done above the same item as the press event
 418
 419         if (clearSelection) {
 420             // Clear the previous selection but reselect the current index
 421             m_selectionManager->setSelectedItems(QSet<int>() << index);
 422         }
 423
 424         if (event->button() & Qt::LeftButton) {
 425             bool emitItemActivated = true;
 426             if (m_view->isAboveExpansionToggle(index, pos)) {
 427                 emit itemExpansionToggleClicked(index);
 428                 emitItemActivated = false;
 429             } else if (shiftOrControlPressed) {
 430                 // The mouse click should only update the selection, not trigger the item
 431                 emitItemActivated = false;
 432             } else if (!KGlobalSettings::singleClick()) {
 433                 emitItemActivated = false;
 434             }
 435             if (emitItemActivated) {
 436                 emit itemActivated(index);
 437             }
 438         } else if (event->button() & Qt::MidButton) {
 439             emit itemMiddleClicked(index);
 440         } else if (event->button() & Qt::RightButton) {
 441             emit contextMenuRequested(index, QPointF(event->pos()));
 442         }
 443     } else if (clearSelection) {
 444         m_selectionManager->clearSelection();
 445     }
 446
 447     m_pressedMousePos = QPointF();
 448     m_pressedIndex = -1;
 449     return false;
 450 }
 451
 452 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 453 {
 454     const QPointF pos = transform.map(event->pos());
 455     const int index = m_view->itemAt(pos);
 456
 457     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 458                            (event->button() & Qt::LeftButton) &&
 459                            index >= 0 && index < m_model->count();
 460     if (emitItemActivated) {
 461         emit itemActivated(index);
 462     }
 463     return false;
 464 }
 465
 466 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 467 {
 468     Q_UNUSED(event);
 469     Q_UNUSED(transform);
 470     return false;
 471 }
 472
 473 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 474 {
 475     Q_UNUSED(event);
 476     Q_UNUSED(transform);
 477     return false;
 478 }
 479
 480 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 481 {
 482     Q_UNUSED(transform);
 483     if (!m_model || !m_view) {
 484         return false;
 485     }
 486
 487     KItemListWidget* oldHoveredWidget = hoveredWidget();
 488     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 489     if (oldHoveredWidget != newHoveredWidget) {
 490         if (oldHoveredWidget) {
 491             oldHoveredWidget->setHovered(false);
 492             emit itemUnhovered(oldHoveredWidget->index());
 493         }
 494
 495         if (newHoveredWidget) {
 496             const int index = newHoveredWidget->index();
 497             if (m_model->supportsDropping(index)) {
 498                 newHoveredWidget->setHovered(true);
 499             }
 500             emit itemHovered(index);
 501         }
 502     }
 503
 504     return false;
 505 }
 506
 507 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 508 {
 509     Q_UNUSED(transform)
 510     if (!m_view) {
 511         return false;
 512     }
 513
 514     const QPointF pos = transform.map(event->pos());
 515     const int index = m_view->itemAt(pos);
 516     emit itemDropEvent(index, event);
 517
 518     return true;
 519 }
 520
 521 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 522 {
 523     Q_UNUSED(event);
 524     Q_UNUSED(transform);
 525     return false;
 526 }
 527
 528 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 529 {
 530     Q_UNUSED(transform);
 531     if (!m_model || !m_view) {
 532         return false;
 533     }
 534
 535     KItemListWidget* oldHoveredWidget = hoveredWidget();
 536     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 537     if (oldHoveredWidget != newHoveredWidget) {
 538         if (oldHoveredWidget) {
 539             oldHoveredWidget->setHovered(false);
 540             emit itemUnhovered(oldHoveredWidget->index());
 541         }
 542
 543         if (newHoveredWidget) {
 544             newHoveredWidget->setHovered(true);
 545             emit itemHovered(newHoveredWidget->index());
 546         }
 547     }
 548
 549     return false;
 550 }
 551
 552 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 553 {
 554     Q_UNUSED(event);
 555     Q_UNUSED(transform);
 556
 557     if (!m_model || !m_view) {
 558         return false;
 559     }
 560
 561     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 562         if (widget->isHovered()) {
 563             widget->setHovered(false);
 564             emit itemUnhovered(widget->index());
 565         }
 566     }
 567     return false;
 568 }
 569
 570 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 571 {
 572     Q_UNUSED(event);
 573     Q_UNUSED(transform);
 574     return false;
 575 }
 576
 577 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 578 {
 579     Q_UNUSED(event);
 580     Q_UNUSED(transform);
 581     return false;
 582 }
 583
 584 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 585 {
 586     if (!event) {
 587         return false;
 588     }
 589
 590     switch (event->type()) {
 591     case QEvent::KeyPress:
 592         return keyPressEvent(static_cast<QKeyEvent*>(event));
 593     case QEvent::InputMethod:
 594         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 595     case QEvent::GraphicsSceneMousePress:
 596         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 597     case QEvent::GraphicsSceneMouseMove:
 598         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 599     case QEvent::GraphicsSceneMouseRelease:
 600         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 601     case QEvent::GraphicsSceneMouseDoubleClick:
 602         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 603     case QEvent::GraphicsSceneWheel:
 604          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 605     case QEvent::GraphicsSceneDragEnter:
 606         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 607     case QEvent::GraphicsSceneDragLeave:
 608         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 609     case QEvent::GraphicsSceneDragMove:
 610         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 611     case QEvent::GraphicsSceneDrop:
 612         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 613     case QEvent::GraphicsSceneHoverEnter:
 614         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 615     case QEvent::GraphicsSceneHoverMove:
 616         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 617     case QEvent::GraphicsSceneHoverLeave:
 618         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 619     case QEvent::GraphicsSceneResize:
 620         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 621     default:
 622         break;
 623     }
 624
 625     return false;
 626 }
 627
 628 void KItemListController::slotViewOffsetChanged(qreal current, qreal previous)
 629 {
 630     if (!m_view) {
 631         return;
 632     }
 633
 634     KItemListRubberBand* rubberBand = m_view->rubberBand();
 635     if (rubberBand->isActive()) {
 636         const qreal diff = current - previous;
 637         // TODO: Ideally just QCursor::pos() should be used as
 638         // new end-position but it seems there is no easy way
 639         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 640         // (... or I just missed an easy way to do the mapping)
 641         QPointF endPos = rubberBand->endPosition();
 642         if (m_view->scrollOrientation() == Qt::Vertical) {
 643             endPos.ry() += diff;
 644         } else {
 645             endPos.rx() += diff;
 646         }
 647
 648         rubberBand->setEndPosition(endPos);
 649     }
 650 }
 651
 652 void KItemListController::slotRubberBandChanged()
 653 {
 654     if (!m_view || !m_model || m_model->count() <= 0) {
 655         return;
 656     }
 657
 658     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 659     const QPointF startPos = rubberBand->startPosition();
 660     const QPointF endPos = rubberBand->endPosition();
 661     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 662
 663     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 664     if (scrollVertical) {
 665         rubberBandRect.translate(0, -m_view->offset());
 666     } else {
 667         rubberBandRect.translate(-m_view->offset(), 0);
 668     }
 669
 670     if (!m_oldSelection.isEmpty()) {
 671         // Clear the old selection that was available before the rubberband has
 672         // been activated in case if no Shift- or Control-key are pressed
 673         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 674                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 675         if (!shiftOrControlPressed) {
 676             m_oldSelection.clear();
 677         }
 678     }
 679
 680     QSet<int> selectedItems;
 681
 682     // Select all visible items that intersect with the rubberband
 683     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 684         const int index = widget->index();
 685
 686         const QRectF widgetRect = m_view->itemBoundingRect(index);
 687         if (widgetRect.intersects(rubberBandRect)) {
 688             const QRectF iconRect = widget->iconBoundingRect().translated(widgetRect.topLeft());
 689             const QRectF textRect = widget->textBoundingRect().translated(widgetRect.topLeft());
 690             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 691                 selectedItems.insert(index);
 692             }
 693         }
 694     }
 695
 696     // Select all invisible items that intersect with the rubberband. Instead of
 697     // iterating all items only the area which might be touched by the rubberband
 698     // will be checked.
 699     const bool increaseIndex = scrollVertical ?
 700                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 701
 702     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 703     bool selectionFinished = false;
 704     do {
 705         const QRectF widgetRect = m_view->itemBoundingRect(index);
 706         if (widgetRect.intersects(rubberBandRect)) {
 707             selectedItems.insert(index);
 708         }
 709
 710         if (increaseIndex) {
 711             ++index;
 712             selectionFinished = (index >= m_model->count()) ||
 713                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 714                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 715         } else {
 716             --index;
 717             selectionFinished = (index < 0) ||
 718                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 719                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 720         }
 721     } while (!selectionFinished);
 722
 723     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 724         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 725         // Therefore, the new selection contains:
 726         // 1. All previously selected items which are not inside the rubberband, and
 727         // 2. all items inside the rubberband which have not been selected previously.
 728         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 729     }
 730     else {
 731         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 732     }
 733 }
 734
 735 void KItemListController::startDragging()
 736 {
 737     if (!m_view || !m_model) {
 738         return;
 739     }
 740
 741     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 742     QMimeData* data = m_model->createMimeData(selectedItems);
 743     if (!data) {
 744         return;
 745     }
 746
 747     // The created drag object will be owned and deleted
 748     // by QApplication::activeWindow().
 749     QDrag* drag = new QDrag(QApplication::activeWindow());
 750     drag->setMimeData(data);
 751
 752     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 753     drag->setPixmap(pixmap);
 754
 755     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 756 }
 757
 758 KItemListWidget* KItemListController::hoveredWidget() const
 759 {
 760     Q_ASSERT(m_view);
 761
 762     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 763         if (widget->isHovered()) {
 764             return widget;
 765         }
 766     }
 767
 768     return 0;
 769 }
 770
 771 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 772 {
 773     Q_ASSERT(m_view);
 774
 775     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 776         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 777
 778         const bool hovered = widget->contains(mappedPos) &&
 779                              !widget->expansionToggleRect().contains(mappedPos) &&
 780                              !widget->selectionToggleRect().contains(mappedPos);
 781         if (hovered) {
 782             return widget;
 783         }
 784     }
 785
 786     return 0;
 787 }
 788
 789 #include "kitemlistcontroller.moc"