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             const qreal minDragDiff = 4;
 366             const bool hasMinDragDiff = qAbs(pos.x() - m_pressedMousePos.x()) >= minDragDiff ||
 367                                         qAbs(pos.y() - m_pressedMousePos.y()) >= minDragDiff;
 368             if (hasMinDragDiff) {
 369                 startDragging();
 370             }
 371         }
 372     } else {
 373         KItemListRubberBand* rubberBand = m_view->rubberBand();
 374         if (rubberBand->isActive()) {
 375             QPointF endPos = transform.map(event->pos());
 376             if (m_view->scrollOrientation() == Qt::Vertical) {
 377                 endPos.ry() += m_view->offset();
 378                 if (m_view->itemSize().width() < 0) {
 379                     // Use a special rubberband for views that have only one column and
 380                     // expand the rubberband to use the whole width of the view.
 381                     endPos.setX(m_view->size().width());
 382                 }
 383             } else {
 384                 endPos.rx() += m_view->offset();
 385             }
 386             rubberBand->setEndPosition(endPos);
 387         }
 388     }
 389
 390     return false;
 391 }
 392
 393 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 394 {
 395     if (!m_view) {
 396         return false;
 397     }
 398
 399     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 400                                        event->modifiers() & Qt::ControlModifier;
 401
 402     bool clearSelection = !shiftOrControlPressed && event->button() != Qt::RightButton;
 403
 404     KItemListRubberBand* rubberBand = m_view->rubberBand();
 405     if (rubberBand->isActive()) {
 406         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 407         rubberBand->setActive(false);
 408         m_oldSelection.clear();
 409         m_view->setAutoScroll(false);
 410
 411         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 412             clearSelection = false;
 413         }
 414     }
 415
 416     const QPointF pos = transform.map(event->pos());
 417     const int index = m_view->itemAt(pos);
 418
 419     if (index >= 0 && index == m_pressedIndex) {
 420         // The release event is done above the same item as the press event
 421
 422         if (clearSelection) {
 423             // Clear the previous selection but reselect the current index
 424             m_selectionManager->setSelectedItems(QSet<int>() << index);
 425         }
 426
 427         if (event->button() & Qt::LeftButton) {
 428             bool emitItemActivated = true;
 429             if (m_view->isAboveExpansionToggle(index, pos)) {
 430                 emit itemExpansionToggleClicked(index);
 431                 emitItemActivated = false;
 432             } else if (shiftOrControlPressed) {
 433                 // The mouse click should only update the selection, not trigger the item
 434                 emitItemActivated = false;
 435             } else if (!KGlobalSettings::singleClick()) {
 436                 emitItemActivated = false;
 437             }
 438             if (emitItemActivated) {
 439                 emit itemActivated(index);
 440             }
 441         } else if (event->button() & Qt::MidButton) {
 442             emit itemMiddleClicked(index);
 443         } else if (event->button() & Qt::RightButton) {
 444             emit contextMenuRequested(index, QPointF(event->pos()));
 445         }
 446     } else if (clearSelection) {
 447         m_selectionManager->clearSelection();
 448     }
 449
 450     m_pressedMousePos = QPointF();
 451     m_pressedIndex = -1;
 452     return false;
 453 }
 454
 455 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 456 {
 457     const QPointF pos = transform.map(event->pos());
 458     const int index = m_view->itemAt(pos);
 459
 460     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 461                            (event->button() & Qt::LeftButton) &&
 462                            index >= 0 && index < m_model->count();
 463     if (emitItemActivated) {
 464         emit itemActivated(index);
 465     }
 466     return false;
 467 }
 468
 469 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 470 {
 471     Q_UNUSED(event);
 472     Q_UNUSED(transform);
 473     return false;
 474 }
 475
 476 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 477 {
 478     Q_UNUSED(event);
 479     Q_UNUSED(transform);
 480     return false;
 481 }
 482
 483 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 484 {
 485     Q_UNUSED(transform);
 486     if (!m_model || !m_view) {
 487         return false;
 488     }
 489
 490     KItemListWidget* oldHoveredWidget = hoveredWidget();
 491     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 492     if (oldHoveredWidget != newHoveredWidget) {
 493         if (oldHoveredWidget) {
 494             oldHoveredWidget->setHovered(false);
 495             emit itemUnhovered(oldHoveredWidget->index());
 496         }
 497
 498         if (newHoveredWidget) {
 499             const int index = newHoveredWidget->index();
 500             if (m_model->supportsDropping(index)) {
 501                 newHoveredWidget->setHovered(true);
 502             }
 503             emit itemHovered(index);
 504         }
 505     }
 506
 507     return false;
 508 }
 509
 510 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 511 {
 512     Q_UNUSED(transform)
 513     if (!m_view) {
 514         return false;
 515     }
 516
 517     const QPointF pos = transform.map(event->pos());
 518     const int index = m_view->itemAt(pos);
 519     emit itemDropEvent(index, event);
 520
 521     return true;
 522 }
 523
 524 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 525 {
 526     Q_UNUSED(event);
 527     Q_UNUSED(transform);
 528     return false;
 529 }
 530
 531 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 532 {
 533     Q_UNUSED(transform);
 534     if (!m_model || !m_view) {
 535         return false;
 536     }
 537
 538     KItemListWidget* oldHoveredWidget = hoveredWidget();
 539     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 540     if (oldHoveredWidget != newHoveredWidget) {
 541         if (oldHoveredWidget) {
 542             oldHoveredWidget->setHovered(false);
 543             emit itemUnhovered(oldHoveredWidget->index());
 544         }
 545
 546         if (newHoveredWidget) {
 547             newHoveredWidget->setHovered(true);
 548             emit itemHovered(newHoveredWidget->index());
 549         }
 550     }
 551
 552     return false;
 553 }
 554
 555 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 556 {
 557     Q_UNUSED(event);
 558     Q_UNUSED(transform);
 559
 560     if (!m_model || !m_view) {
 561         return false;
 562     }
 563
 564     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 565         if (widget->isHovered()) {
 566             widget->setHovered(false);
 567             emit itemUnhovered(widget->index());
 568         }
 569     }
 570     return false;
 571 }
 572
 573 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 574 {
 575     Q_UNUSED(event);
 576     Q_UNUSED(transform);
 577     return false;
 578 }
 579
 580 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 581 {
 582     Q_UNUSED(event);
 583     Q_UNUSED(transform);
 584     return false;
 585 }
 586
 587 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 588 {
 589     if (!event) {
 590         return false;
 591     }
 592
 593     switch (event->type()) {
 594     case QEvent::KeyPress:
 595         return keyPressEvent(static_cast<QKeyEvent*>(event));
 596     case QEvent::InputMethod:
 597         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 598     case QEvent::GraphicsSceneMousePress:
 599         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 600     case QEvent::GraphicsSceneMouseMove:
 601         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 602     case QEvent::GraphicsSceneMouseRelease:
 603         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 604     case QEvent::GraphicsSceneMouseDoubleClick:
 605         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 606     case QEvent::GraphicsSceneWheel:
 607          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 608     case QEvent::GraphicsSceneDragEnter:
 609         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 610     case QEvent::GraphicsSceneDragLeave:
 611         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 612     case QEvent::GraphicsSceneDragMove:
 613         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 614     case QEvent::GraphicsSceneDrop:
 615         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 616     case QEvent::GraphicsSceneHoverEnter:
 617         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 618     case QEvent::GraphicsSceneHoverMove:
 619         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 620     case QEvent::GraphicsSceneHoverLeave:
 621         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 622     case QEvent::GraphicsSceneResize:
 623         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 624     default:
 625         break;
 626     }
 627
 628     return false;
 629 }
 630
 631 void KItemListController::slotViewOffsetChanged(qreal current, qreal previous)
 632 {
 633     if (!m_view) {
 634         return;
 635     }
 636
 637     KItemListRubberBand* rubberBand = m_view->rubberBand();
 638     if (rubberBand->isActive()) {
 639         const qreal diff = current - previous;
 640         // TODO: Ideally just QCursor::pos() should be used as
 641         // new end-position but it seems there is no easy way
 642         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 643         // (... or I just missed an easy way to do the mapping)
 644         QPointF endPos = rubberBand->endPosition();
 645         if (m_view->scrollOrientation() == Qt::Vertical) {
 646             endPos.ry() += diff;
 647         } else {
 648             endPos.rx() += diff;
 649         }
 650
 651         rubberBand->setEndPosition(endPos);
 652     }
 653 }
 654
 655 void KItemListController::slotRubberBandChanged()
 656 {
 657     if (!m_view || !m_model || m_model->count() <= 0) {
 658         return;
 659     }
 660
 661     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 662     const QPointF startPos = rubberBand->startPosition();
 663     const QPointF endPos = rubberBand->endPosition();
 664     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 665
 666     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 667     if (scrollVertical) {
 668         rubberBandRect.translate(0, -m_view->offset());
 669     } else {
 670         rubberBandRect.translate(-m_view->offset(), 0);
 671     }
 672
 673     if (!m_oldSelection.isEmpty()) {
 674         // Clear the old selection that was available before the rubberband has
 675         // been activated in case if no Shift- or Control-key are pressed
 676         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 677                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 678         if (!shiftOrControlPressed) {
 679             m_oldSelection.clear();
 680         }
 681     }
 682
 683     QSet<int> selectedItems;
 684
 685     // Select all visible items that intersect with the rubberband
 686     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 687         const int index = widget->index();
 688
 689         const QRectF widgetRect = m_view->itemBoundingRect(index);
 690         if (widgetRect.intersects(rubberBandRect)) {
 691             const QRectF iconRect = widget->iconBoundingRect().translated(widgetRect.topLeft());
 692             const QRectF textRect = widget->textBoundingRect().translated(widgetRect.topLeft());
 693             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 694                 selectedItems.insert(index);
 695             }
 696         }
 697     }
 698
 699     // Select all invisible items that intersect with the rubberband. Instead of
 700     // iterating all items only the area which might be touched by the rubberband
 701     // will be checked.
 702     const bool increaseIndex = scrollVertical ?
 703                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 704
 705     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 706     bool selectionFinished = false;
 707     do {
 708         const QRectF widgetRect = m_view->itemBoundingRect(index);
 709         if (widgetRect.intersects(rubberBandRect)) {
 710             selectedItems.insert(index);
 711         }
 712
 713         if (increaseIndex) {
 714             ++index;
 715             selectionFinished = (index >= m_model->count()) ||
 716                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 717                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 718         } else {
 719             --index;
 720             selectionFinished = (index < 0) ||
 721                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 722                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 723         }
 724     } while (!selectionFinished);
 725
 726     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 727         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 728         // Therefore, the new selection contains:
 729         // 1. All previously selected items which are not inside the rubberband, and
 730         // 2. all items inside the rubberband which have not been selected previously.
 731         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 732     }
 733     else {
 734         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 735     }
 736 }
 737
 738 void KItemListController::startDragging()
 739 {
 740     if (!m_view || !m_model) {
 741         return;
 742     }
 743
 744     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 745     QMimeData* data = m_model->createMimeData(selectedItems);
 746     if (!data) {
 747         return;
 748     }
 749
 750     // The created drag object will be owned and deleted
 751     // by QApplication::activeWindow().
 752     QDrag* drag = new QDrag(QApplication::activeWindow());
 753     drag->setMimeData(data);
 754
 755     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 756     drag->setPixmap(pixmap);
 757
 758     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 759 }
 760
 761 KItemListWidget* KItemListController::hoveredWidget() const
 762 {
 763     Q_ASSERT(m_view);
 764
 765     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 766         if (widget->isHovered()) {
 767             return widget;
 768         }
 769     }
 770
 771     return 0;
 772 }
 773
 774 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 775 {
 776     Q_ASSERT(m_view);
 777
 778     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 779         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 780
 781         const bool hovered = widget->contains(mappedPos) &&
 782                              !widget->expansionToggleRect().contains(mappedPos) &&
 783                              !widget->selectionToggleRect().contains(mappedPos);
 784         if (hovered) {
 785             return widget;
 786         }
 787     }
 788
 789     return 0;
 790 }
 791
 792 #include "kitemlistcontroller.moc"