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(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(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(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(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         if (event->buttons() & Qt::RightButton) {
 326             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 327         }
 328
 329         return true;
 330     }
 331
 332     if (event->buttons() & Qt::RightButton) {
 333         m_selectionManager->clearSelection();
 334
 335         const QRectF headerBounds = m_view->headerBoundaries();
 336         if (headerBounds.contains(event->pos())) {
 337             emit headerContextMenuRequested(event->screenPos());
 338         } else {
 339             emit viewContextMenuRequested(event->screenPos());
 340         }
 341         return true;
 342     }
 343
 344     KItemListRubberBand* rubberBand = m_view->rubberBand();
 345     QPointF startPos = m_pressedMousePos;
 346     if (m_view->scrollOrientation() == Qt::Vertical) {
 347         startPos.ry() += m_view->scrollOffset();
 348         if (m_view->itemSize().width() < 0) {
 349             // Use a special rubberband for views that have only one column and
 350             // expand the rubberband to use the whole width of the view.
 351             startPos.setX(0);
 352         }
 353     } else {
 354         startPos.rx() += m_view->scrollOffset();
 355     }
 356
 357     m_oldSelection = m_selectionManager->selectedItems();
 358     rubberBand->setStartPosition(startPos);
 359     rubberBand->setEndPosition(startPos);
 360     rubberBand->setActive(true);
 361     connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 362     m_view->setAutoScroll(true);
 363
 364     return false;
 365 }
 366
 367 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 368 {
 369     if (!m_view) {
 370         return false;
 371     }
 372
 373     if (m_pressedIndex >= 0) {
 374         // Check whether a dragging should be started
 375         if (event->buttons() & Qt::LeftButton) {
 376             const QPointF pos = transform.map(event->pos());
 377             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 378                 startDragging();
 379             }
 380         }
 381     } else {
 382         KItemListRubberBand* rubberBand = m_view->rubberBand();
 383         if (rubberBand->isActive()) {
 384             QPointF endPos = transform.map(event->pos());
 385             if (m_view->scrollOrientation() == Qt::Vertical) {
 386                 endPos.ry() += m_view->scrollOffset();
 387                 if (m_view->itemSize().width() < 0) {
 388                     // Use a special rubberband for views that have only one column and
 389                     // expand the rubberband to use the whole width of the view.
 390                     endPos.setX(m_view->size().width());
 391                 }
 392             } else {
 393                 endPos.rx() += m_view->scrollOffset();
 394             }
 395             rubberBand->setEndPosition(endPos);
 396         }
 397     }
 398
 399     return false;
 400 }
 401
 402 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 403 {
 404     if (!m_view) {
 405         return false;
 406     }
 407
 408     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 409                                        event->modifiers() & Qt::ControlModifier;
 410
 411     bool clearSelection = !shiftOrControlPressed && event->button() != Qt::RightButton;
 412
 413     KItemListRubberBand* rubberBand = m_view->rubberBand();
 414     if (rubberBand->isActive()) {
 415         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 416         rubberBand->setActive(false);
 417         m_oldSelection.clear();
 418         m_view->setAutoScroll(false);
 419
 420         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 421             clearSelection = false;
 422         }
 423     }
 424
 425     const QPointF pos = transform.map(event->pos());
 426     const int index = m_view->itemAt(pos);
 427
 428     if (index >= 0 && index == m_pressedIndex) {
 429         // The release event is done above the same item as the press event
 430
 431         if (clearSelection) {
 432             // Clear the previous selection but reselect the current index
 433             m_selectionManager->setSelectedItems(QSet<int>() << index);
 434         }
 435
 436         if (event->button() & Qt::LeftButton) {
 437             bool emitItemActivated = true;
 438             if (m_view->isAboveExpansionToggle(index, pos)) {
 439                 emit itemExpansionToggleClicked(index);
 440                 emitItemActivated = false;
 441             } else if (shiftOrControlPressed) {
 442                 // The mouse click should only update the selection, not trigger the item
 443                 emitItemActivated = false;
 444             } else if (!KGlobalSettings::singleClick()) {
 445                 emitItemActivated = false;
 446             }
 447             if (emitItemActivated) {
 448                 emit itemActivated(index);
 449             }
 450         } else if (event->button() & Qt::MidButton) {
 451             emit itemMiddleClicked(index);
 452         }
 453     } else if (clearSelection) {
 454         m_selectionManager->clearSelection();
 455     }
 456
 457     m_pressedMousePos = QPointF();
 458     m_pressedIndex = -1;
 459     return false;
 460 }
 461
 462 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 463 {
 464     const QPointF pos = transform.map(event->pos());
 465     const int index = m_view->itemAt(pos);
 466
 467     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 468                            (event->button() & Qt::LeftButton) &&
 469                            index >= 0 && index < m_model->count();
 470     if (emitItemActivated) {
 471         emit itemActivated(index);
 472     }
 473     return false;
 474 }
 475
 476 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 477 {
 478     Q_UNUSED(event);
 479     Q_UNUSED(transform);
 480     return false;
 481 }
 482
 483 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 484 {
 485     Q_UNUSED(event);
 486     Q_UNUSED(transform);
 487     return false;
 488 }
 489
 490 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 491 {
 492     Q_UNUSED(transform);
 493     if (!m_model || !m_view) {
 494         return false;
 495     }
 496
 497     KItemListWidget* oldHoveredWidget = hoveredWidget();
 498     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 499     if (oldHoveredWidget != newHoveredWidget) {
 500         if (oldHoveredWidget) {
 501             oldHoveredWidget->setHovered(false);
 502             emit itemUnhovered(oldHoveredWidget->index());
 503         }
 504
 505         if (newHoveredWidget) {
 506             const int index = newHoveredWidget->index();
 507             if (m_model->supportsDropping(index)) {
 508                 newHoveredWidget->setHovered(true);
 509             }
 510             emit itemHovered(index);
 511         }
 512     }
 513
 514     return false;
 515 }
 516
 517 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 518 {
 519     Q_UNUSED(transform)
 520     if (!m_view) {
 521         return false;
 522     }
 523
 524     const QPointF pos = transform.map(event->pos());
 525     const int index = m_view->itemAt(pos);
 526     emit itemDropEvent(index, event);
 527
 528     return true;
 529 }
 530
 531 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 532 {
 533     Q_UNUSED(event);
 534     Q_UNUSED(transform);
 535     return false;
 536 }
 537
 538 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 539 {
 540     Q_UNUSED(transform);
 541     if (!m_model || !m_view) {
 542         return false;
 543     }
 544
 545     KItemListWidget* oldHoveredWidget = hoveredWidget();
 546     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 547     if (oldHoveredWidget != newHoveredWidget) {
 548         if (oldHoveredWidget) {
 549             oldHoveredWidget->setHovered(false);
 550             emit itemUnhovered(oldHoveredWidget->index());
 551         }
 552
 553         if (newHoveredWidget) {
 554             newHoveredWidget->setHovered(true);
 555             emit itemHovered(newHoveredWidget->index());
 556         }
 557     }
 558
 559     return false;
 560 }
 561
 562 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 563 {
 564     Q_UNUSED(event);
 565     Q_UNUSED(transform);
 566
 567     if (!m_model || !m_view) {
 568         return false;
 569     }
 570
 571     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 572         if (widget->isHovered()) {
 573             widget->setHovered(false);
 574             emit itemUnhovered(widget->index());
 575         }
 576     }
 577     return false;
 578 }
 579
 580 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 581 {
 582     Q_UNUSED(event);
 583     Q_UNUSED(transform);
 584     return false;
 585 }
 586
 587 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 588 {
 589     Q_UNUSED(event);
 590     Q_UNUSED(transform);
 591     return false;
 592 }
 593
 594 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 595 {
 596     if (!event) {
 597         return false;
 598     }
 599
 600     switch (event->type()) {
 601     case QEvent::KeyPress:
 602         return keyPressEvent(static_cast<QKeyEvent*>(event));
 603     case QEvent::InputMethod:
 604         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 605     case QEvent::GraphicsSceneMousePress:
 606         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 607     case QEvent::GraphicsSceneMouseMove:
 608         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 609     case QEvent::GraphicsSceneMouseRelease:
 610         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 611     case QEvent::GraphicsSceneMouseDoubleClick:
 612         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 613     case QEvent::GraphicsSceneWheel:
 614          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 615     case QEvent::GraphicsSceneDragEnter:
 616         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 617     case QEvent::GraphicsSceneDragLeave:
 618         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 619     case QEvent::GraphicsSceneDragMove:
 620         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 621     case QEvent::GraphicsSceneDrop:
 622         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 623     case QEvent::GraphicsSceneHoverEnter:
 624         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 625     case QEvent::GraphicsSceneHoverMove:
 626         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 627     case QEvent::GraphicsSceneHoverLeave:
 628         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 629     case QEvent::GraphicsSceneResize:
 630         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 631     default:
 632         break;
 633     }
 634
 635     return false;
 636 }
 637
 638 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 639 {
 640     if (!m_view) {
 641         return;
 642     }
 643
 644     KItemListRubberBand* rubberBand = m_view->rubberBand();
 645     if (rubberBand->isActive()) {
 646         const qreal diff = current - previous;
 647         // TODO: Ideally just QCursor::pos() should be used as
 648         // new end-position but it seems there is no easy way
 649         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 650         // (... or I just missed an easy way to do the mapping)
 651         QPointF endPos = rubberBand->endPosition();
 652         if (m_view->scrollOrientation() == Qt::Vertical) {
 653             endPos.ry() += diff;
 654         } else {
 655             endPos.rx() += diff;
 656         }
 657
 658         rubberBand->setEndPosition(endPos);
 659     }
 660 }
 661
 662 void KItemListController::slotRubberBandChanged()
 663 {
 664     if (!m_view || !m_model || m_model->count() <= 0) {
 665         return;
 666     }
 667
 668     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 669     const QPointF startPos = rubberBand->startPosition();
 670     const QPointF endPos = rubberBand->endPosition();
 671     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 672
 673     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 674     if (scrollVertical) {
 675         rubberBandRect.translate(0, -m_view->scrollOffset());
 676     } else {
 677         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 678     }
 679
 680     if (!m_oldSelection.isEmpty()) {
 681         // Clear the old selection that was available before the rubberband has
 682         // been activated in case if no Shift- or Control-key are pressed
 683         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 684                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 685         if (!shiftOrControlPressed) {
 686             m_oldSelection.clear();
 687         }
 688     }
 689
 690     QSet<int> selectedItems;
 691
 692     // Select all visible items that intersect with the rubberband
 693     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 694         const int index = widget->index();
 695
 696         const QRectF widgetRect = m_view->itemBoundingRect(index);
 697         if (widgetRect.intersects(rubberBandRect)) {
 698             const QRectF iconRect = widget->iconBoundingRect().translated(widgetRect.topLeft());
 699             const QRectF textRect = widget->textBoundingRect().translated(widgetRect.topLeft());
 700             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 701                 selectedItems.insert(index);
 702             }
 703         }
 704     }
 705
 706     // Select all invisible items that intersect with the rubberband. Instead of
 707     // iterating all items only the area which might be touched by the rubberband
 708     // will be checked.
 709     const bool increaseIndex = scrollVertical ?
 710                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 711
 712     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 713     bool selectionFinished = false;
 714     do {
 715         const QRectF widgetRect = m_view->itemBoundingRect(index);
 716         if (widgetRect.intersects(rubberBandRect)) {
 717             selectedItems.insert(index);
 718         }
 719
 720         if (increaseIndex) {
 721             ++index;
 722             selectionFinished = (index >= m_model->count()) ||
 723                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 724                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 725         } else {
 726             --index;
 727             selectionFinished = (index < 0) ||
 728                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 729                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 730         }
 731     } while (!selectionFinished);
 732
 733     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 734         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 735         // Therefore, the new selection contains:
 736         // 1. All previously selected items which are not inside the rubberband, and
 737         // 2. all items inside the rubberband which have not been selected previously.
 738         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 739     }
 740     else {
 741         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 742     }
 743 }
 744
 745 void KItemListController::startDragging()
 746 {
 747     if (!m_view || !m_model) {
 748         return;
 749     }
 750
 751     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 752     QMimeData* data = m_model->createMimeData(selectedItems);
 753     if (!data) {
 754         return;
 755     }
 756
 757     // The created drag object will be owned and deleted
 758     // by QApplication::activeWindow().
 759     QDrag* drag = new QDrag(QApplication::activeWindow());
 760     drag->setMimeData(data);
 761
 762     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 763     drag->setPixmap(pixmap);
 764
 765     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 766 }
 767
 768 KItemListWidget* KItemListController::hoveredWidget() const
 769 {
 770     Q_ASSERT(m_view);
 771
 772     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 773         if (widget->isHovered()) {
 774             return widget;
 775         }
 776     }
 777
 778     return 0;
 779 }
 780
 781 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 782 {
 783     Q_ASSERT(m_view);
 784
 785     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 786         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 787
 788         const bool hovered = widget->contains(mappedPos) &&
 789                              !widget->expansionToggleRect().contains(mappedPos) &&
 790                              !widget->selectionToggleRect().contains(mappedPos);
 791         if (hovered) {
 792             return widget;
 793         }
 794     }
 795
 796     return 0;
 797 }
 798
 799 #include "kitemlistcontroller.moc"