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 <QGraphicsScene>
  34 #include <QGraphicsSceneEvent>
  35 #include <QGraphicsView>
  36 #include <QMimeData>
  37 #include <QTimer>
  38
  39 #include <KGlobalSettings>
  40 #include <KDebug>
  41
  42 KItemListController::KItemListController(QObject* parent) :
  43     QObject(parent),
  44     m_selectionTogglePressed(false),
  45     m_selectionBehavior(NoSelection),
  46     m_model(0),
  47     m_view(0),
  48     m_selectionManager(new KItemListSelectionManager(this)),
  49     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  50     m_pressedIndex(-1),
  51     m_pressedMousePos(),
  52     m_autoActivationTimer(0),
  53     m_oldSelection()
  54 {
  55     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
  56             this, SLOT(slotChangeCurrentItem(QString,bool)));
  57
  58     m_autoActivationTimer = new QTimer(this);
  59     m_autoActivationTimer->setSingleShot(true);
  60     m_autoActivationTimer->setInterval(-1);
  61     connect(m_autoActivationTimer, SIGNAL(timeout()), this, SLOT(slotAutoActivationTimeout()));
  62 }
  63
  64 KItemListController::~KItemListController()
  65 {
  66 }
  67
  68 void KItemListController::setModel(KItemModelBase* model)
  69 {
  70     if (m_model == model) {
  71         return;
  72     }
  73
  74     KItemModelBase* oldModel = m_model;
  75     m_model = model;
  76
  77     if (m_view) {
  78         m_view->setModel(m_model);
  79     }
  80
  81     m_selectionManager->setModel(m_model);
  82
  83     emit modelChanged(m_model, oldModel);
  84 }
  85
  86 KItemModelBase* KItemListController::model() const
  87 {
  88     return m_model;
  89 }
  90
  91 KItemListSelectionManager* KItemListController::selectionManager() const
  92 {
  93     return m_selectionManager;
  94 }
  95
  96 void KItemListController::setView(KItemListView* view)
  97 {
  98     if (m_view == view) {
  99         return;
 100     }
 101
 102     KItemListView* oldView = m_view;
 103     if (oldView) {
 104         disconnect(oldView, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 105     }
 106
 107     m_view = view;
 108
 109     if (m_view) {
 110         m_view->setController(this);
 111         m_view->setModel(m_model);
 112         connect(m_view, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 113     }
 114
 115     emit viewChanged(m_view, oldView);
 116 }
 117
 118 KItemListView* KItemListController::view() const
 119 {
 120     return m_view;
 121 }
 122
 123 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 124 {
 125     m_selectionBehavior = behavior;
 126 }
 127
 128 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 129 {
 130     return m_selectionBehavior;
 131 }
 132
 133 void KItemListController::setAutoActivationDelay(int delay)
 134 {
 135     m_autoActivationTimer->setInterval(delay);
 136 }
 137
 138 int KItemListController::autoActivationDelay() const
 139 {
 140     return m_autoActivationTimer->interval();
 141 }
 142
 143 bool KItemListController::showEvent(QShowEvent* event)
 144 {
 145     Q_UNUSED(event);
 146     return false;
 147 }
 148
 149 bool KItemListController::hideEvent(QHideEvent* event)
 150 {
 151     Q_UNUSED(event);
 152     return false;
 153 }
 154
 155 bool KItemListController::keyPressEvent(QKeyEvent* event)
 156 {
 157     int index = m_selectionManager->currentItem();
 158     int key = event->key();
 159
 160     // Handle the expanding/collapsing of items
 161     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 162         if (key == Qt::Key_Right) {
 163             if (m_model->setExpanded(index, true)) {
 164                 return true;
 165             }
 166         } else if (key == Qt::Key_Left) {
 167             if (m_model->setExpanded(index, false)) {
 168                 return true;
 169             }
 170         }
 171     }
 172
 173     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 174     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 175     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 176
 177     const int itemCount = m_model->count();
 178     const int itemsPerRow = m_view->itemsPerOffset();
 179
 180     // For horizontal scroll orientation, transform
 181     // the arrow keys to simplify the event handling.
 182     if (m_view->scrollOrientation() == Qt::Horizontal) {
 183         switch (key) {
 184         case Qt::Key_Up:    key = Qt::Key_Left; break;
 185         case Qt::Key_Down:  key = Qt::Key_Right; break;
 186         case Qt::Key_Left:  key = Qt::Key_Up; break;
 187         case Qt::Key_Right: key = Qt::Key_Down; break;
 188         default:            break;
 189         }
 190     }
 191
 192     switch (key) {
 193     case Qt::Key_Home:
 194         index = 0;
 195         break;
 196
 197     case Qt::Key_End:
 198         index = itemCount - 1;
 199         break;
 200
 201     case Qt::Key_Left:
 202         if (index > 0) {
 203             index--;
 204         }
 205         break;
 206
 207     case Qt::Key_Right:
 208         if (index < itemCount - 1) {
 209             index++;
 210         }
 211         break;
 212
 213     case Qt::Key_Up:
 214         if (index >= itemsPerRow) {
 215             index -= itemsPerRow;
 216         }
 217         break;
 218
 219     case Qt::Key_Down:
 220         if (index + itemsPerRow < itemCount) {
 221             // We are not in the last row yet.
 222             index += itemsPerRow;
 223         } else {
 224             // We are either in the last row already, or we are in the second-last row,
 225             // and there is no item below the current item.
 226             // In the latter case, we jump to the very last item.
 227             const int currentColumn = index % itemsPerRow;
 228             const int lastItemColumn = (itemCount - 1) % itemsPerRow;
 229             const bool inLastRow = currentColumn < lastItemColumn;
 230             if (!inLastRow) {
 231                 index = itemCount - 1;
 232             }
 233         }
 234         break;
 235
 236     case Qt::Key_Enter:
 237     case Qt::Key_Return: {
 238         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 239         if (selectedItems.count() >= 2) {
 240             emit itemsActivated(selectedItems);
 241         } else if (selectedItems.count() == 1) {
 242             emit itemActivated(selectedItems.toList().first());
 243         } else {
 244             emit itemActivated(index);
 245         }
 246         break;
 247     }
 248
 249     case Qt::Key_Space:
 250         if (controlPressed) {
 251             m_selectionManager->endAnchoredSelection();
 252             m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 253             m_selectionManager->beginAnchoredSelection(index);
 254         } else {
 255             m_keyboardManager->addKeys(event->text());
 256         }
 257         break;
 258
 259     case Qt::Key_Menu: {
 260         // Emit the signal itemContextMenuRequested() in case if at least one
 261         // item is selected. Otherwise the signal viewContextMenuRequested() will be emitted.
 262         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 263         int index = -1;
 264         if (selectedItems.count() >= 2) {
 265             const int currentItemIndex = m_selectionManager->currentItem();
 266             index = selectedItems.contains(currentItemIndex)
 267                     ? currentItemIndex : selectedItems.toList().first();
 268         } else if (selectedItems.count() == 1) {
 269             index = selectedItems.toList().first();
 270         }
 271
 272         if (index >= 0) {
 273             const QRectF contextRect = m_view->itemContextRect(index);
 274             const QPointF pos(m_view->scene()->views().first()->mapToGlobal(contextRect.bottomRight().toPoint()));
 275             emit itemContextMenuRequested(index, pos);
 276         } else {
 277             emit viewContextMenuRequested(QCursor::pos());
 278         }
 279         break;
 280     }
 281
 282     default:
 283         m_keyboardManager->addKeys(event->text());
 284         return false;
 285     }
 286
 287     if (m_selectionManager->currentItem() != index) {
 288         if (controlPressed) {
 289             m_selectionManager->endAnchoredSelection();
 290         }
 291
 292         m_selectionManager->setCurrentItem(index);
 293
 294         if (!shiftOrControlPressed || m_selectionBehavior == SingleSelection) {
 295             m_selectionManager->clearSelection();
 296             m_selectionManager->setSelected(index, 1);
 297         }
 298
 299         if (!shiftPressed) {
 300             m_selectionManager->beginAnchoredSelection(index);
 301         }
 302
 303         m_view->scrollToItem(index);
 304     }
 305     return true;
 306 }
 307
 308 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 309 {
 310     if (!m_model || m_model->count() == 0) {
 311         return;
 312     }
 313     const int currentIndex = m_selectionManager->currentItem();
 314     int index;
 315     if (searchFromNextItem) {
 316         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 317     } else {
 318         index = m_model->indexForKeyboardSearch(text, currentIndex);
 319     }
 320     if (index >= 0) {
 321         m_selectionManager->setCurrentItem(index);
 322         m_selectionManager->clearSelection();
 323         m_selectionManager->setSelected(index, 1);
 324         m_selectionManager->beginAnchoredSelection(index);
 325         m_view->scrollToItem(index);
 326     }
 327 }
 328
 329 void KItemListController::slotAutoActivationTimeout()
 330 {
 331     if (!m_model || !m_view) {
 332         return;
 333     }
 334
 335     const int index = m_autoActivationTimer->property("index").toInt();
 336     if (index < 0 || index >= m_model->count()) {
 337         return;
 338     }
 339
 340     if (m_model->supportsDropping(index)) {
 341         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 342             const bool expanded = m_model->isExpanded(index);
 343             m_model->setExpanded(index, !expanded);
 344         } else {
 345             emit itemActivated(index);
 346         }
 347     }
 348 }
 349
 350 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 351 {
 352     Q_UNUSED(event);
 353     return false;
 354 }
 355
 356 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 357 {
 358     if (!m_view) {
 359         return false;
 360     }
 361
 362     m_pressedMousePos = transform.map(event->pos());
 363     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 364
 365     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 366         m_selectionManager->setCurrentItem(m_pressedIndex);
 367         return true;
 368     }
 369
 370     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 371     if (m_selectionTogglePressed) {
 372         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 373         // The previous anchored selection has been finished already in
 374         // KItemListSelectionManager::setSelected(). We can safely change
 375         // the current item and start a new anchored selection now.
 376         m_selectionManager->setCurrentItem(m_pressedIndex);
 377         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 378         return true;
 379     }
 380
 381     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 382     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 383
 384     // The previous selection is cleared if either
 385     // 1. The selection mode is SingleSelection, or
 386     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 387     //    a) Shift or Control are pressed.
 388     //    b) The clicked item is selected already. In that case, the user might want to:
 389     //       - start dragging multiple items, or
 390     //       - open the context menu and perform an action for all selected items.
 391     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 392     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 393     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 394                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 395     if (clearSelection) {
 396         m_selectionManager->clearSelection();
 397     }
 398
 399     if (!shiftPressed) {
 400         // Finish the anchored selection before the current index is changed
 401         m_selectionManager->endAnchoredSelection();
 402     }
 403
 404     if (m_pressedIndex >= 0) {
 405         m_selectionManager->setCurrentItem(m_pressedIndex);
 406
 407         switch (m_selectionBehavior) {
 408         case NoSelection:
 409             break;
 410
 411         case SingleSelection:
 412             m_selectionManager->setSelected(m_pressedIndex);
 413             break;
 414
 415         case MultiSelection:
 416             if (controlPressed) {
 417                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 418                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 419             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 420                 // Select the pressed item and start a new anchored selection
 421                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 422                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 423             }
 424             break;
 425
 426         default:
 427             Q_ASSERT(false);
 428             break;
 429         }
 430
 431         if (event->buttons() & Qt::RightButton) {
 432             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 433         }
 434
 435         return true;
 436     }
 437
 438     if (event->buttons() & Qt::RightButton) {
 439         const QRectF headerBounds = m_view->headerBoundaries();
 440         if (headerBounds.contains(event->pos())) {
 441             emit headerContextMenuRequested(event->screenPos());
 442         } else {
 443             emit viewContextMenuRequested(event->screenPos());
 444         }
 445         return true;
 446     }
 447
 448     if (m_selectionBehavior == MultiSelection) {
 449         QPointF startPos = m_pressedMousePos;
 450         if (m_view->scrollOrientation() == Qt::Vertical) {
 451             startPos.ry() += m_view->scrollOffset();
 452             if (m_view->itemSize().width() < 0) {
 453                 // Use a special rubberband for views that have only one column and
 454                 // expand the rubberband to use the whole width of the view.
 455                 startPos.setX(0);
 456             }
 457         } else {
 458             startPos.rx() += m_view->scrollOffset();
 459         }
 460
 461         m_oldSelection = m_selectionManager->selectedItems();
 462         KItemListRubberBand* rubberBand = m_view->rubberBand();
 463         rubberBand->setStartPosition(startPos);
 464         rubberBand->setEndPosition(startPos);
 465         rubberBand->setActive(true);
 466         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 467         m_view->setAutoScroll(true);
 468     }
 469
 470     return false;
 471 }
 472
 473 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 474 {
 475     if (!m_view) {
 476         return false;
 477     }
 478
 479     if (m_pressedIndex >= 0) {
 480         // Check whether a dragging should be started
 481         if (event->buttons() & Qt::LeftButton) {
 482             const QPointF pos = transform.map(event->pos());
 483             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 484                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 485                     // Always assure that the dragged item gets selected. Usually this is already
 486                     // done on the mouse-press event, but when using the selection-toggle on a
 487                     // selected item the dragged item is not selected yet.
 488                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 489                 }
 490                 startDragging();
 491             }
 492         }
 493     } else {
 494         KItemListRubberBand* rubberBand = m_view->rubberBand();
 495         if (rubberBand->isActive()) {
 496             QPointF endPos = transform.map(event->pos());
 497
 498             // Update the current item.
 499             const int newCurrent = m_view->itemAt(endPos);
 500             if (newCurrent >= 0) {
 501                 // It's expected that the new current index is also the new anchor (bug 163451).
 502                 m_selectionManager->endAnchoredSelection();
 503                 m_selectionManager->setCurrentItem(newCurrent);
 504                 m_selectionManager->beginAnchoredSelection(newCurrent);
 505             }
 506
 507             if (m_view->scrollOrientation() == Qt::Vertical) {
 508                 endPos.ry() += m_view->scrollOffset();
 509                 if (m_view->itemSize().width() < 0) {
 510                     // Use a special rubberband for views that have only one column and
 511                     // expand the rubberband to use the whole width of the view.
 512                     endPos.setX(m_view->size().width());
 513                 }
 514             } else {
 515                 endPos.rx() += m_view->scrollOffset();
 516             }
 517             rubberBand->setEndPosition(endPos);
 518         }
 519     }
 520
 521     return false;
 522 }
 523
 524 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 525 {
 526     if (!m_view) {
 527         return false;
 528     }
 529
 530     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 531     if (isAboveSelectionToggle) {
 532         m_selectionTogglePressed = false;
 533         return true;
 534     }
 535
 536     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 537         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 538         m_selectionTogglePressed = false;
 539         return true;
 540     }
 541
 542     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 543                                        event->modifiers() & Qt::ControlModifier;
 544
 545     KItemListRubberBand* rubberBand = m_view->rubberBand();
 546     if (rubberBand->isActive()) {
 547         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 548         rubberBand->setActive(false);
 549         m_oldSelection.clear();
 550         m_view->setAutoScroll(false);
 551     }
 552
 553     const QPointF pos = transform.map(event->pos());
 554     const int index = m_view->itemAt(pos);
 555
 556     if (index >= 0 && index == m_pressedIndex) {
 557         // The release event is done above the same item as the press event
 558
 559         if (event->button() & Qt::LeftButton) {
 560             bool emitItemActivated = true;
 561             if (m_view->isAboveExpansionToggle(index, pos)) {
 562                 const bool expanded = m_model->isExpanded(index);
 563                 m_model->setExpanded(index, !expanded);
 564
 565                 emit itemExpansionToggleClicked(index);
 566                 emitItemActivated = false;
 567             } else if (shiftOrControlPressed) {
 568                 // The mouse click should only update the selection, not trigger the item
 569                 emitItemActivated = false;
 570             } else if (!KGlobalSettings::singleClick()) {
 571                 emitItemActivated = false;
 572             }
 573             if (emitItemActivated) {
 574                 emit itemActivated(index);
 575             }
 576         } else if (event->button() & Qt::MidButton) {
 577             emit itemMiddleClicked(index);
 578         }
 579     }
 580
 581     m_pressedMousePos = QPointF();
 582     m_pressedIndex = -1;
 583     return false;
 584 }
 585
 586 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 587 {
 588     const QPointF pos = transform.map(event->pos());
 589     const int index = m_view->itemAt(pos);
 590
 591     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 592                              (event->button() & Qt::LeftButton) &&
 593                              index >= 0 && index < m_model->count();
 594     if (emitItemActivated) {
 595         emit itemActivated(index);
 596     }
 597     return false;
 598 }
 599
 600 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 601 {
 602     Q_UNUSED(event);
 603     Q_UNUSED(transform);
 604     return false;
 605 }
 606
 607 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 608 {
 609     Q_UNUSED(event);
 610     Q_UNUSED(transform);
 611     return false;
 612 }
 613
 614 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 615 {
 616     Q_UNUSED(transform);
 617     if (!m_model || !m_view) {
 618         return false;
 619     }
 620
 621     KItemListWidget* oldHoveredWidget = hoveredWidget();
 622
 623     const QPointF pos = transform.map(event->pos());
 624     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 625
 626     if (oldHoveredWidget != newHoveredWidget) {
 627         m_autoActivationTimer->stop();
 628
 629         if (oldHoveredWidget) {
 630             oldHoveredWidget->setHovered(false);
 631             emit itemUnhovered(oldHoveredWidget->index());
 632         }
 633
 634         if (newHoveredWidget) {
 635             const int index = newHoveredWidget->index();
 636             if (m_model->supportsDropping(index)) {
 637                 newHoveredWidget->setHovered(true);
 638             }
 639             emit itemHovered(index);
 640
 641             if (m_autoActivationTimer->interval() >= 0) {
 642                 m_autoActivationTimer->setProperty("index", index);
 643                 m_autoActivationTimer->start();
 644             }
 645         }
 646     }
 647
 648     return false;
 649 }
 650
 651 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 652 {
 653     Q_UNUSED(transform)
 654     if (!m_view) {
 655         return false;
 656     }
 657
 658     m_autoActivationTimer->stop();
 659
 660     const QPointF pos = transform.map(event->pos());
 661     const int index = m_view->itemAt(pos);
 662     emit itemDropEvent(index, event);
 663
 664     return true;
 665 }
 666
 667 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 668 {
 669     Q_UNUSED(event);
 670     Q_UNUSED(transform);
 671     return false;
 672 }
 673
 674 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 675 {
 676     Q_UNUSED(transform);
 677     if (!m_model || !m_view) {
 678         return false;
 679     }
 680
 681     KItemListWidget* oldHoveredWidget = hoveredWidget();
 682     const QPointF pos = transform.map(event->pos());
 683     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 684
 685     if (oldHoveredWidget != newHoveredWidget) {
 686         if (oldHoveredWidget) {
 687             oldHoveredWidget->setHovered(false);
 688             emit itemUnhovered(oldHoveredWidget->index());
 689         }
 690
 691         if (newHoveredWidget) {
 692             newHoveredWidget->setHovered(true);
 693             emit itemHovered(newHoveredWidget->index());
 694         }
 695     }
 696
 697     return false;
 698 }
 699
 700 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 701 {
 702     Q_UNUSED(event);
 703     Q_UNUSED(transform);
 704
 705     if (!m_model || !m_view) {
 706         return false;
 707     }
 708
 709     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 710         if (widget->isHovered()) {
 711             widget->setHovered(false);
 712             emit itemUnhovered(widget->index());
 713         }
 714     }
 715     return false;
 716 }
 717
 718 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 719 {
 720     Q_UNUSED(event);
 721     Q_UNUSED(transform);
 722     return false;
 723 }
 724
 725 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 726 {
 727     Q_UNUSED(event);
 728     Q_UNUSED(transform);
 729     return false;
 730 }
 731
 732 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 733 {
 734     if (!event) {
 735         return false;
 736     }
 737
 738     switch (event->type()) {
 739     case QEvent::KeyPress:
 740         return keyPressEvent(static_cast<QKeyEvent*>(event));
 741     case QEvent::InputMethod:
 742         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 743     case QEvent::GraphicsSceneMousePress:
 744         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 745     case QEvent::GraphicsSceneMouseMove:
 746         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 747     case QEvent::GraphicsSceneMouseRelease:
 748         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 749     case QEvent::GraphicsSceneMouseDoubleClick:
 750         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 751     case QEvent::GraphicsSceneWheel:
 752          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 753     case QEvent::GraphicsSceneDragEnter:
 754         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 755     case QEvent::GraphicsSceneDragLeave:
 756         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 757     case QEvent::GraphicsSceneDragMove:
 758         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 759     case QEvent::GraphicsSceneDrop:
 760         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 761     case QEvent::GraphicsSceneHoverEnter:
 762         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 763     case QEvent::GraphicsSceneHoverMove:
 764         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 765     case QEvent::GraphicsSceneHoverLeave:
 766         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 767     case QEvent::GraphicsSceneResize:
 768         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 769     default:
 770         break;
 771     }
 772
 773     return false;
 774 }
 775
 776 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 777 {
 778     if (!m_view) {
 779         return;
 780     }
 781
 782     KItemListRubberBand* rubberBand = m_view->rubberBand();
 783     if (rubberBand->isActive()) {
 784         const qreal diff = current - previous;
 785         // TODO: Ideally just QCursor::pos() should be used as
 786         // new end-position but it seems there is no easy way
 787         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 788         // (... or I just missed an easy way to do the mapping)
 789         QPointF endPos = rubberBand->endPosition();
 790         if (m_view->scrollOrientation() == Qt::Vertical) {
 791             endPos.ry() += diff;
 792         } else {
 793             endPos.rx() += diff;
 794         }
 795
 796         rubberBand->setEndPosition(endPos);
 797     }
 798 }
 799
 800 void KItemListController::slotRubberBandChanged()
 801 {
 802     if (!m_view || !m_model || m_model->count() <= 0) {
 803         return;
 804     }
 805
 806     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 807     const QPointF startPos = rubberBand->startPosition();
 808     const QPointF endPos = rubberBand->endPosition();
 809     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 810
 811     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 812     if (scrollVertical) {
 813         rubberBandRect.translate(0, -m_view->scrollOffset());
 814     } else {
 815         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 816     }
 817
 818     if (!m_oldSelection.isEmpty()) {
 819         // Clear the old selection that was available before the rubberband has
 820         // been activated in case if no Shift- or Control-key are pressed
 821         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 822                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 823         if (!shiftOrControlPressed) {
 824             m_oldSelection.clear();
 825         }
 826     }
 827
 828     QSet<int> selectedItems;
 829
 830     // Select all visible items that intersect with the rubberband
 831     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 832         const int index = widget->index();
 833
 834         const QRectF widgetRect = m_view->itemRect(index);
 835         if (widgetRect.intersects(rubberBandRect)) {
 836             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 837             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 838             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 839                 selectedItems.insert(index);
 840             }
 841         }
 842     }
 843
 844     // Select all invisible items that intersect with the rubberband. Instead of
 845     // iterating all items only the area which might be touched by the rubberband
 846     // will be checked.
 847     const bool increaseIndex = scrollVertical ?
 848                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 849
 850     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 851     bool selectionFinished = false;
 852     do {
 853         const QRectF widgetRect = m_view->itemRect(index);
 854         if (widgetRect.intersects(rubberBandRect)) {
 855             selectedItems.insert(index);
 856         }
 857
 858         if (increaseIndex) {
 859             ++index;
 860             selectionFinished = (index >= m_model->count()) ||
 861                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 862                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 863         } else {
 864             --index;
 865             selectionFinished = (index < 0) ||
 866                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 867                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 868         }
 869     } while (!selectionFinished);
 870
 871     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 872         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 873         // Therefore, the new selection contains:
 874         // 1. All previously selected items which are not inside the rubberband, and
 875         // 2. all items inside the rubberband which have not been selected previously.
 876         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 877     }
 878     else {
 879         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 880     }
 881 }
 882
 883 void KItemListController::startDragging()
 884 {
 885     if (!m_view || !m_model) {
 886         return;
 887     }
 888
 889     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 890     if (selectedItems.isEmpty()) {
 891         return;
 892     }
 893
 894     QMimeData* data = m_model->createMimeData(selectedItems);
 895     if (!data) {
 896         return;
 897     }
 898
 899     // The created drag object will be owned and deleted
 900     // by QApplication::activeWindow().
 901     QDrag* drag = new QDrag(QApplication::activeWindow());
 902     drag->setMimeData(data);
 903
 904     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 905     drag->setPixmap(pixmap);
 906
 907     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 908 }
 909
 910 KItemListWidget* KItemListController::hoveredWidget() const
 911 {
 912     Q_ASSERT(m_view);
 913
 914     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 915         if (widget->isHovered()) {
 916             return widget;
 917         }
 918     }
 919
 920     return 0;
 921 }
 922
 923 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 924 {
 925     Q_ASSERT(m_view);
 926
 927     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 928         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 929
 930         const bool hovered = widget->contains(mappedPos) &&
 931                              !widget->expansionToggleRect().contains(mappedPos);
 932         if (hovered) {
 933             return widget;
 934         }
 935     }
 936
 937     return 0;
 938 }
 939
 940 #include "kitemlistcontroller.moc"