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_selectionTogglePressed(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(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(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(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(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     int index = m_selectionManager->currentItem();
 139     int key = event->key();
 140
 141     // Handle the expanding/collapsing of items
 142     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 143         if (key == Qt::Key_Right) {
 144             if (m_model->setExpanded(index, true)) {
 145                 return true;
 146             }
 147         } else if (key == Qt::Key_Left) {
 148             if (m_model->setExpanded(index, false)) {
 149                 return true;
 150             }
 151         }
 152     }
 153
 154     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 155     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 156     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 157
 158     const int itemCount = m_model->count();
 159     const int itemsPerRow = m_view->itemsPerOffset();
 160
 161     // For horizontal scroll orientation, transform
 162     // the arrow keys to simplify the event handling.
 163     if (m_view->scrollOrientation() == Qt::Horizontal) {
 164         switch (key) {
 165         case Qt::Key_Up:    key = Qt::Key_Left; break;
 166         case Qt::Key_Down:  key = Qt::Key_Right; break;
 167         case Qt::Key_Left:  key = Qt::Key_Up; break;
 168         case Qt::Key_Right: key = Qt::Key_Down; break;
 169         default:            break;
 170         }
 171     }
 172
 173
 174     switch (key) {
 175     case Qt::Key_Home:
 176         index = 0;
 177         break;
 178
 179     case Qt::Key_End:
 180         index = itemCount - 1;
 181         break;
 182
 183     case Qt::Key_Left:
 184         if (index > 0) {
 185             index--;
 186         }
 187         break;
 188
 189     case Qt::Key_Right:
 190         if (index < itemCount - 1) {
 191             index++;
 192         }
 193         break;
 194
 195     case Qt::Key_Up:
 196         if (index >= itemsPerRow) {
 197             index -= itemsPerRow;
 198         }
 199         break;
 200
 201     case Qt::Key_Down:
 202         if (index + itemsPerRow < itemCount) {
 203             // We are not in the last row yet.
 204             index += itemsPerRow;
 205         }
 206         else {
 207             // We are either in the last row already, or we are in the second-last row,
 208             // and there is no item below the current item.
 209             // In the latter case, we jump to the very last item.
 210             const int currentColumn = index % itemsPerRow;
 211             const int lastItemColumn = (itemCount - 1) % itemsPerRow;
 212             const bool inLastRow = currentColumn < lastItemColumn;
 213             if (!inLastRow) {
 214                 index = itemCount - 1;
 215             }
 216         }
 217         break;
 218
 219     case Qt::Key_Enter:
 220     case Qt::Key_Return:
 221         emit itemActivated(index);
 222         break;
 223
 224     case Qt::Key_Space:
 225         if (controlPressed) {
 226             m_selectionManager->endAnchoredSelection();
 227             m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 228             m_selectionManager->beginAnchoredSelection(index);
 229             break;
 230         }
 231
 232     default:
 233         m_keyboardManager->addKeys(event->text());
 234         return false;
 235     }
 236
 237     if (m_selectionManager->currentItem() != index) {
 238         if (controlPressed) {
 239             m_selectionManager->endAnchoredSelection();
 240         }
 241
 242         m_selectionManager->setCurrentItem(index);
 243
 244         if (!shiftOrControlPressed || m_selectionBehavior == SingleSelection) {
 245             m_selectionManager->clearSelection();
 246             m_selectionManager->setSelected(index, 1);
 247         }
 248
 249         if (!shiftPressed) {
 250             m_selectionManager->beginAnchoredSelection(index);
 251         }
 252
 253         m_view->scrollToItem(index);
 254     }
 255     return true;
 256 }
 257
 258 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 259 {
 260     if (!m_model || m_model->count() == 0) {
 261         return;
 262     }
 263     const int currentIndex = m_selectionManager->currentItem();
 264     int index;
 265     if (searchFromNextItem) {
 266         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 267     }
 268     else {
 269         index = m_model->indexForKeyboardSearch(text, currentIndex);
 270     }
 271     if (index >= 0) {
 272         m_selectionManager->setCurrentItem(index);
 273         m_selectionManager->clearSelection();
 274         m_selectionManager->setSelected(index, 1);
 275         m_selectionManager->beginAnchoredSelection(index);
 276     }
 277 }
 278
 279 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 280 {
 281     Q_UNUSED(event);
 282     return false;
 283 }
 284
 285 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 286 {
 287     if (!m_view) {
 288         return false;
 289     }
 290
 291     m_pressedMousePos = transform.map(event->pos());
 292     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 293
 294     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 295         m_selectionManager->setCurrentItem(m_pressedIndex);
 296         return true;
 297     }
 298
 299     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 300     if (m_selectionTogglePressed) {
 301         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 302         return true;
 303     }
 304
 305     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 306     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 307
 308     if (m_selectionBehavior == SingleSelection) {
 309         m_selectionManager->clearSelection();
 310     }
 311
 312     if (!shiftPressed) {
 313         // Finish the anchored selection before the current index is changed
 314         m_selectionManager->endAnchoredSelection();
 315     }
 316
 317     if (m_pressedIndex >= 0) {
 318         m_selectionManager->setCurrentItem(m_pressedIndex);
 319
 320         switch (m_selectionBehavior) {
 321         case NoSelection:
 322             break;
 323
 324         case SingleSelection:
 325             m_selectionManager->setSelected(m_pressedIndex);
 326             break;
 327
 328         case MultiSelection:
 329             if (controlPressed) {
 330                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 331                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 332             } else if (event->buttons() & Qt::RightButton) {
 333                 // Only clear the selection if a context menu is requested above a non-selected item
 334                 if (!m_selectionManager->selectedItems().contains(m_pressedIndex)) {
 335                     m_selectionManager->setSelectedItems(QSet<int>() << m_pressedIndex);
 336                 }
 337             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 338                 // Select the pressed item and start a new anchored selection
 339                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 340                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 341             }
 342             break;
 343
 344         default:
 345             Q_ASSERT(false);
 346             break;
 347         }
 348
 349         if (event->buttons() & Qt::RightButton) {
 350             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 351         }
 352
 353         return true;
 354     }
 355
 356     if (event->buttons() & Qt::RightButton) {
 357         m_selectionManager->clearSelection();
 358
 359         const QRectF headerBounds = m_view->headerBoundaries();
 360         if (headerBounds.contains(event->pos())) {
 361             emit headerContextMenuRequested(event->screenPos());
 362         } else {
 363             emit viewContextMenuRequested(event->screenPos());
 364         }
 365         return true;
 366     }
 367
 368     if (m_selectionBehavior == MultiSelection) {
 369         QPointF startPos = m_pressedMousePos;
 370         if (m_view->scrollOrientation() == Qt::Vertical) {
 371             startPos.ry() += m_view->scrollOffset();
 372             if (m_view->itemSize().width() < 0) {
 373                 // Use a special rubberband for views that have only one column and
 374                 // expand the rubberband to use the whole width of the view.
 375                 startPos.setX(0);
 376             }
 377         } else {
 378             startPos.rx() += m_view->scrollOffset();
 379         }
 380
 381         m_oldSelection = m_selectionManager->selectedItems();
 382         KItemListRubberBand* rubberBand = m_view->rubberBand();
 383         rubberBand->setStartPosition(startPos);
 384         rubberBand->setEndPosition(startPos);
 385         rubberBand->setActive(true);
 386         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 387         m_view->setAutoScroll(true);
 388     }
 389
 390     return false;
 391 }
 392
 393 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 394 {
 395     if (!m_view) {
 396         return false;
 397     }
 398
 399     if (m_pressedIndex >= 0) {
 400         // Check whether a dragging should be started
 401         if (event->buttons() & Qt::LeftButton) {
 402             const QPointF pos = transform.map(event->pos());
 403             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 404                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 405                     // Always assure that the dragged item gets selected. Usually this is already
 406                     // done on the mouse-press event, but when using the selection-toggle on a
 407                     // selected item the dragged item is not selected yet.
 408                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 409                 }
 410                 startDragging();
 411             }
 412         }
 413     } else {
 414         KItemListRubberBand* rubberBand = m_view->rubberBand();
 415         if (rubberBand->isActive()) {
 416             QPointF endPos = transform.map(event->pos());
 417             if (m_view->scrollOrientation() == Qt::Vertical) {
 418                 endPos.ry() += m_view->scrollOffset();
 419                 if (m_view->itemSize().width() < 0) {
 420                     // Use a special rubberband for views that have only one column and
 421                     // expand the rubberband to use the whole width of the view.
 422                     endPos.setX(m_view->size().width());
 423                 }
 424             } else {
 425                 endPos.rx() += m_view->scrollOffset();
 426             }
 427             rubberBand->setEndPosition(endPos);
 428         }
 429     }
 430
 431     return false;
 432 }
 433
 434 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 435 {
 436     if (!m_view) {
 437         return false;
 438     }
 439
 440     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 441     if (isAboveSelectionToggle) {
 442         m_selectionTogglePressed = false;
 443         return true;
 444     }
 445
 446     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 447         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 448         m_selectionTogglePressed = false;
 449         return true;
 450     }
 451
 452     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 453                                        event->modifiers() & Qt::ControlModifier;
 454
 455     bool clearSelection = !shiftOrControlPressed && event->button() != Qt::RightButton;
 456
 457     KItemListRubberBand* rubberBand = m_view->rubberBand();
 458     if (rubberBand->isActive()) {
 459         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 460         rubberBand->setActive(false);
 461         m_oldSelection.clear();
 462         m_view->setAutoScroll(false);
 463
 464         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 465             clearSelection = false;
 466         }
 467     }
 468
 469     const QPointF pos = transform.map(event->pos());
 470     const int index = m_view->itemAt(pos);
 471
 472     if (index >= 0 && index == m_pressedIndex) {
 473         // The release event is done above the same item as the press event
 474
 475         if (clearSelection) {
 476             // Clear the previous selection but reselect the current index
 477             m_selectionManager->setSelectedItems(QSet<int>() << index);
 478         }
 479
 480         if (event->button() & Qt::LeftButton) {
 481             bool emitItemActivated = true;
 482             if (m_view->isAboveExpansionToggle(index, pos)) {
 483                 const bool expanded = m_model->isExpanded(index);
 484                 m_model->setExpanded(index, !expanded);
 485
 486                 emit itemExpansionToggleClicked(index);
 487                 emitItemActivated = false;
 488             } else if (shiftOrControlPressed) {
 489                 // The mouse click should only update the selection, not trigger the item
 490                 emitItemActivated = false;
 491             } else if (!KGlobalSettings::singleClick()) {
 492                 emitItemActivated = false;
 493             }
 494             if (emitItemActivated) {
 495                 emit itemActivated(index);
 496             }
 497         } else if (event->button() & Qt::MidButton) {
 498             emit itemMiddleClicked(index);
 499         }
 500     } else if (clearSelection) {
 501         m_selectionManager->clearSelection();
 502     }
 503
 504     m_pressedMousePos = QPointF();
 505     m_pressedIndex = -1;
 506     return false;
 507 }
 508
 509 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 510 {
 511     const QPointF pos = transform.map(event->pos());
 512     const int index = m_view->itemAt(pos);
 513
 514     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 515                              (event->button() & Qt::LeftButton) &&
 516                              index >= 0 && index < m_model->count();
 517     if (emitItemActivated) {
 518         emit itemActivated(index);
 519     }
 520     return false;
 521 }
 522
 523 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 524 {
 525     Q_UNUSED(event);
 526     Q_UNUSED(transform);
 527     return false;
 528 }
 529
 530 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 531 {
 532     Q_UNUSED(event);
 533     Q_UNUSED(transform);
 534     return false;
 535 }
 536
 537 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 538 {
 539     Q_UNUSED(transform);
 540     if (!m_model || !m_view) {
 541         return false;
 542     }
 543
 544     KItemListWidget* oldHoveredWidget = hoveredWidget();
 545     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 546     if (oldHoveredWidget != newHoveredWidget) {
 547         if (oldHoveredWidget) {
 548             oldHoveredWidget->setHovered(false);
 549             emit itemUnhovered(oldHoveredWidget->index());
 550         }
 551
 552         if (newHoveredWidget) {
 553             const int index = newHoveredWidget->index();
 554             if (m_model->supportsDropping(index)) {
 555                 newHoveredWidget->setHovered(true);
 556             }
 557             emit itemHovered(index);
 558         }
 559     }
 560
 561     return false;
 562 }
 563
 564 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 565 {
 566     Q_UNUSED(transform)
 567     if (!m_view) {
 568         return false;
 569     }
 570
 571     const QPointF pos = transform.map(event->pos());
 572     const int index = m_view->itemAt(pos);
 573     emit itemDropEvent(index, event);
 574
 575     return true;
 576 }
 577
 578 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 579 {
 580     Q_UNUSED(event);
 581     Q_UNUSED(transform);
 582     return false;
 583 }
 584
 585 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 586 {
 587     Q_UNUSED(transform);
 588     if (!m_model || !m_view) {
 589         return false;
 590     }
 591
 592     KItemListWidget* oldHoveredWidget = hoveredWidget();
 593     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 594     if (oldHoveredWidget != newHoveredWidget) {
 595         if (oldHoveredWidget) {
 596             oldHoveredWidget->setHovered(false);
 597             emit itemUnhovered(oldHoveredWidget->index());
 598         }
 599
 600         if (newHoveredWidget) {
 601             newHoveredWidget->setHovered(true);
 602             emit itemHovered(newHoveredWidget->index());
 603         }
 604     }
 605
 606     return false;
 607 }
 608
 609 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 610 {
 611     Q_UNUSED(event);
 612     Q_UNUSED(transform);
 613
 614     if (!m_model || !m_view) {
 615         return false;
 616     }
 617
 618     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 619         if (widget->isHovered()) {
 620             widget->setHovered(false);
 621             emit itemUnhovered(widget->index());
 622         }
 623     }
 624     return false;
 625 }
 626
 627 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 628 {
 629     Q_UNUSED(event);
 630     Q_UNUSED(transform);
 631     return false;
 632 }
 633
 634 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 635 {
 636     Q_UNUSED(event);
 637     Q_UNUSED(transform);
 638     return false;
 639 }
 640
 641 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 642 {
 643     if (!event) {
 644         return false;
 645     }
 646
 647     switch (event->type()) {
 648     case QEvent::KeyPress:
 649         return keyPressEvent(static_cast<QKeyEvent*>(event));
 650     case QEvent::InputMethod:
 651         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 652     case QEvent::GraphicsSceneMousePress:
 653         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 654     case QEvent::GraphicsSceneMouseMove:
 655         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 656     case QEvent::GraphicsSceneMouseRelease:
 657         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 658     case QEvent::GraphicsSceneMouseDoubleClick:
 659         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 660     case QEvent::GraphicsSceneWheel:
 661          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 662     case QEvent::GraphicsSceneDragEnter:
 663         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 664     case QEvent::GraphicsSceneDragLeave:
 665         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 666     case QEvent::GraphicsSceneDragMove:
 667         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 668     case QEvent::GraphicsSceneDrop:
 669         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 670     case QEvent::GraphicsSceneHoverEnter:
 671         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 672     case QEvent::GraphicsSceneHoverMove:
 673         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 674     case QEvent::GraphicsSceneHoverLeave:
 675         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 676     case QEvent::GraphicsSceneResize:
 677         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 678     default:
 679         break;
 680     }
 681
 682     return false;
 683 }
 684
 685 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 686 {
 687     if (!m_view) {
 688         return;
 689     }
 690
 691     KItemListRubberBand* rubberBand = m_view->rubberBand();
 692     if (rubberBand->isActive()) {
 693         const qreal diff = current - previous;
 694         // TODO: Ideally just QCursor::pos() should be used as
 695         // new end-position but it seems there is no easy way
 696         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 697         // (... or I just missed an easy way to do the mapping)
 698         QPointF endPos = rubberBand->endPosition();
 699         if (m_view->scrollOrientation() == Qt::Vertical) {
 700             endPos.ry() += diff;
 701         } else {
 702             endPos.rx() += diff;
 703         }
 704
 705         rubberBand->setEndPosition(endPos);
 706     }
 707 }
 708
 709 void KItemListController::slotRubberBandChanged()
 710 {
 711     if (!m_view || !m_model || m_model->count() <= 0) {
 712         return;
 713     }
 714
 715     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 716     const QPointF startPos = rubberBand->startPosition();
 717     const QPointF endPos = rubberBand->endPosition();
 718     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 719
 720     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 721     if (scrollVertical) {
 722         rubberBandRect.translate(0, -m_view->scrollOffset());
 723     } else {
 724         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 725     }
 726
 727     if (!m_oldSelection.isEmpty()) {
 728         // Clear the old selection that was available before the rubberband has
 729         // been activated in case if no Shift- or Control-key are pressed
 730         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 731                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 732         if (!shiftOrControlPressed) {
 733             m_oldSelection.clear();
 734         }
 735     }
 736
 737     QSet<int> selectedItems;
 738
 739     // Select all visible items that intersect with the rubberband
 740     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 741         const int index = widget->index();
 742
 743         const QRectF widgetRect = m_view->itemRect(index);
 744         if (widgetRect.intersects(rubberBandRect)) {
 745             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 746             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 747             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 748                 selectedItems.insert(index);
 749             }
 750         }
 751     }
 752
 753     // Select all invisible items that intersect with the rubberband. Instead of
 754     // iterating all items only the area which might be touched by the rubberband
 755     // will be checked.
 756     const bool increaseIndex = scrollVertical ?
 757                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 758
 759     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 760     bool selectionFinished = false;
 761     do {
 762         const QRectF widgetRect = m_view->itemRect(index);
 763         if (widgetRect.intersects(rubberBandRect)) {
 764             selectedItems.insert(index);
 765         }
 766
 767         if (increaseIndex) {
 768             ++index;
 769             selectionFinished = (index >= m_model->count()) ||
 770                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 771                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 772         } else {
 773             --index;
 774             selectionFinished = (index < 0) ||
 775                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 776                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 777         }
 778     } while (!selectionFinished);
 779
 780     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 781         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 782         // Therefore, the new selection contains:
 783         // 1. All previously selected items which are not inside the rubberband, and
 784         // 2. all items inside the rubberband which have not been selected previously.
 785         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 786     }
 787     else {
 788         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 789     }
 790 }
 791
 792 void KItemListController::startDragging()
 793 {
 794     if (!m_view || !m_model) {
 795         return;
 796     }
 797
 798     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 799     if (selectedItems.isEmpty()) {
 800         return;
 801     }
 802
 803     QMimeData* data = m_model->createMimeData(selectedItems);
 804     if (!data) {
 805         return;
 806     }
 807
 808     // The created drag object will be owned and deleted
 809     // by QApplication::activeWindow().
 810     QDrag* drag = new QDrag(QApplication::activeWindow());
 811     drag->setMimeData(data);
 812
 813     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 814     drag->setPixmap(pixmap);
 815
 816     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 817 }
 818
 819 KItemListWidget* KItemListController::hoveredWidget() const
 820 {
 821     Q_ASSERT(m_view);
 822
 823     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 824         if (widget->isHovered()) {
 825             return widget;
 826         }
 827     }
 828
 829     return 0;
 830 }
 831
 832 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 833 {
 834     Q_ASSERT(m_view);
 835
 836     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 837         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 838
 839         const bool hovered = widget->contains(mappedPos) &&
 840                              !widget->expansionToggleRect().contains(mappedPos);
 841         if (hovered) {
 842             return widget;
 843         }
 844     }
 845
 846     return 0;
 847 }
 848
 849 #include "kitemlistcontroller.moc"