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         m_selectionManager->setCurrentItem(m_pressedIndex);
 374         return true;
 375     }
 376
 377     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 378     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 379
 380     // The previous selection is cleared if either
 381     // 1. The selection mode is SingleSelection, or
 382     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 383     //    a) Shift or Control are pressed.
 384     //    b) The clicked item is selected already. In that case, the user might want to:
 385     //       - start dragging multiple items, or
 386     //       - open the context menu and perform an action for all selected items.
 387     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 388     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 389     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 390                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 391     if (clearSelection) {
 392         m_selectionManager->clearSelection();
 393     }
 394
 395     if (!shiftPressed) {
 396         // Finish the anchored selection before the current index is changed
 397         m_selectionManager->endAnchoredSelection();
 398     }
 399
 400     if (m_pressedIndex >= 0) {
 401         m_selectionManager->setCurrentItem(m_pressedIndex);
 402
 403         switch (m_selectionBehavior) {
 404         case NoSelection:
 405             break;
 406
 407         case SingleSelection:
 408             m_selectionManager->setSelected(m_pressedIndex);
 409             break;
 410
 411         case MultiSelection:
 412             if (controlPressed) {
 413                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 414                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 415             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 416                 // Select the pressed item and start a new anchored selection
 417                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 418                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 419             }
 420             break;
 421
 422         default:
 423             Q_ASSERT(false);
 424             break;
 425         }
 426
 427         if (event->buttons() & Qt::RightButton) {
 428             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 429         }
 430
 431         return true;
 432     }
 433
 434     if (event->buttons() & Qt::RightButton) {
 435         const QRectF headerBounds = m_view->headerBoundaries();
 436         if (headerBounds.contains(event->pos())) {
 437             emit headerContextMenuRequested(event->screenPos());
 438         } else {
 439             emit viewContextMenuRequested(event->screenPos());
 440         }
 441         return true;
 442     }
 443
 444     if (m_selectionBehavior == MultiSelection) {
 445         QPointF startPos = m_pressedMousePos;
 446         if (m_view->scrollOrientation() == Qt::Vertical) {
 447             startPos.ry() += m_view->scrollOffset();
 448             if (m_view->itemSize().width() < 0) {
 449                 // Use a special rubberband for views that have only one column and
 450                 // expand the rubberband to use the whole width of the view.
 451                 startPos.setX(0);
 452             }
 453         } else {
 454             startPos.rx() += m_view->scrollOffset();
 455         }
 456
 457         m_oldSelection = m_selectionManager->selectedItems();
 458         KItemListRubberBand* rubberBand = m_view->rubberBand();
 459         rubberBand->setStartPosition(startPos);
 460         rubberBand->setEndPosition(startPos);
 461         rubberBand->setActive(true);
 462         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 463         m_view->setAutoScroll(true);
 464     }
 465
 466     return false;
 467 }
 468
 469 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 470 {
 471     if (!m_view) {
 472         return false;
 473     }
 474
 475     if (m_pressedIndex >= 0) {
 476         // Check whether a dragging should be started
 477         if (event->buttons() & Qt::LeftButton) {
 478             const QPointF pos = transform.map(event->pos());
 479             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 480                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 481                     // Always assure that the dragged item gets selected. Usually this is already
 482                     // done on the mouse-press event, but when using the selection-toggle on a
 483                     // selected item the dragged item is not selected yet.
 484                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 485                 }
 486                 startDragging();
 487             }
 488         }
 489     } else {
 490         KItemListRubberBand* rubberBand = m_view->rubberBand();
 491         if (rubberBand->isActive()) {
 492             QPointF endPos = transform.map(event->pos());
 493
 494             // Update the current item.
 495             const int newCurrent = m_view->itemAt(endPos);
 496             if (newCurrent >= 0) {
 497                 // It's expected that the new current index is also the new anchor (bug 163451).
 498                 m_selectionManager->endAnchoredSelection();
 499                 m_selectionManager->setCurrentItem(newCurrent);
 500                 m_selectionManager->beginAnchoredSelection(newCurrent);
 501             }
 502
 503             if (m_view->scrollOrientation() == Qt::Vertical) {
 504                 endPos.ry() += m_view->scrollOffset();
 505                 if (m_view->itemSize().width() < 0) {
 506                     // Use a special rubberband for views that have only one column and
 507                     // expand the rubberband to use the whole width of the view.
 508                     endPos.setX(m_view->size().width());
 509                 }
 510             } else {
 511                 endPos.rx() += m_view->scrollOffset();
 512             }
 513             rubberBand->setEndPosition(endPos);
 514         }
 515     }
 516
 517     return false;
 518 }
 519
 520 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 521 {
 522     if (!m_view) {
 523         return false;
 524     }
 525
 526     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 527     if (isAboveSelectionToggle) {
 528         m_selectionTogglePressed = false;
 529         return true;
 530     }
 531
 532     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 533         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 534         m_selectionTogglePressed = false;
 535         return true;
 536     }
 537
 538     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 539                                        event->modifiers() & Qt::ControlModifier;
 540
 541     KItemListRubberBand* rubberBand = m_view->rubberBand();
 542     if (rubberBand->isActive()) {
 543         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 544         rubberBand->setActive(false);
 545         m_oldSelection.clear();
 546         m_view->setAutoScroll(false);
 547     }
 548
 549     const QPointF pos = transform.map(event->pos());
 550     const int index = m_view->itemAt(pos);
 551
 552     if (index >= 0 && index == m_pressedIndex) {
 553         // The release event is done above the same item as the press event
 554
 555         if (event->button() & Qt::LeftButton) {
 556             bool emitItemActivated = true;
 557             if (m_view->isAboveExpansionToggle(index, pos)) {
 558                 const bool expanded = m_model->isExpanded(index);
 559                 m_model->setExpanded(index, !expanded);
 560
 561                 emit itemExpansionToggleClicked(index);
 562                 emitItemActivated = false;
 563             } else if (shiftOrControlPressed) {
 564                 // The mouse click should only update the selection, not trigger the item
 565                 emitItemActivated = false;
 566             } else if (!KGlobalSettings::singleClick()) {
 567                 emitItemActivated = false;
 568             }
 569             if (emitItemActivated) {
 570                 emit itemActivated(index);
 571             }
 572         } else if (event->button() & Qt::MidButton) {
 573             emit itemMiddleClicked(index);
 574         }
 575     }
 576
 577     m_pressedMousePos = QPointF();
 578     m_pressedIndex = -1;
 579     return false;
 580 }
 581
 582 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 583 {
 584     const QPointF pos = transform.map(event->pos());
 585     const int index = m_view->itemAt(pos);
 586
 587     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 588                              (event->button() & Qt::LeftButton) &&
 589                              index >= 0 && index < m_model->count();
 590     if (emitItemActivated) {
 591         emit itemActivated(index);
 592     }
 593     return false;
 594 }
 595
 596 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 597 {
 598     Q_UNUSED(event);
 599     Q_UNUSED(transform);
 600     return false;
 601 }
 602
 603 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 604 {
 605     Q_UNUSED(event);
 606     Q_UNUSED(transform);
 607     return false;
 608 }
 609
 610 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 611 {
 612     Q_UNUSED(transform);
 613     if (!m_model || !m_view) {
 614         return false;
 615     }
 616
 617     KItemListWidget* oldHoveredWidget = hoveredWidget();
 618
 619     const QPointF pos = transform.map(event->pos());
 620     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 621
 622     if (oldHoveredWidget != newHoveredWidget) {
 623         m_autoActivationTimer->stop();
 624
 625         if (oldHoveredWidget) {
 626             oldHoveredWidget->setHovered(false);
 627             emit itemUnhovered(oldHoveredWidget->index());
 628         }
 629
 630         if (newHoveredWidget) {
 631             const int index = newHoveredWidget->index();
 632             if (m_model->supportsDropping(index)) {
 633                 newHoveredWidget->setHovered(true);
 634             }
 635             emit itemHovered(index);
 636
 637             if (m_autoActivationTimer->interval() >= 0) {
 638                 m_autoActivationTimer->setProperty("index", index);
 639                 m_autoActivationTimer->start();
 640             }
 641         }
 642     }
 643
 644     return false;
 645 }
 646
 647 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 648 {
 649     Q_UNUSED(transform)
 650     if (!m_view) {
 651         return false;
 652     }
 653
 654     m_autoActivationTimer->stop();
 655
 656     const QPointF pos = transform.map(event->pos());
 657     const int index = m_view->itemAt(pos);
 658     emit itemDropEvent(index, event);
 659
 660     return true;
 661 }
 662
 663 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 664 {
 665     Q_UNUSED(event);
 666     Q_UNUSED(transform);
 667     return false;
 668 }
 669
 670 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 671 {
 672     Q_UNUSED(transform);
 673     if (!m_model || !m_view) {
 674         return false;
 675     }
 676
 677     KItemListWidget* oldHoveredWidget = hoveredWidget();
 678     const QPointF pos = transform.map(event->pos());
 679     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 680
 681     if (oldHoveredWidget != newHoveredWidget) {
 682         if (oldHoveredWidget) {
 683             oldHoveredWidget->setHovered(false);
 684             emit itemUnhovered(oldHoveredWidget->index());
 685         }
 686
 687         if (newHoveredWidget) {
 688             newHoveredWidget->setHovered(true);
 689             emit itemHovered(newHoveredWidget->index());
 690         }
 691     }
 692
 693     return false;
 694 }
 695
 696 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 697 {
 698     Q_UNUSED(event);
 699     Q_UNUSED(transform);
 700
 701     if (!m_model || !m_view) {
 702         return false;
 703     }
 704
 705     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 706         if (widget->isHovered()) {
 707             widget->setHovered(false);
 708             emit itemUnhovered(widget->index());
 709         }
 710     }
 711     return false;
 712 }
 713
 714 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 715 {
 716     Q_UNUSED(event);
 717     Q_UNUSED(transform);
 718     return false;
 719 }
 720
 721 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 722 {
 723     Q_UNUSED(event);
 724     Q_UNUSED(transform);
 725     return false;
 726 }
 727
 728 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 729 {
 730     if (!event) {
 731         return false;
 732     }
 733
 734     switch (event->type()) {
 735     case QEvent::KeyPress:
 736         return keyPressEvent(static_cast<QKeyEvent*>(event));
 737     case QEvent::InputMethod:
 738         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 739     case QEvent::GraphicsSceneMousePress:
 740         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 741     case QEvent::GraphicsSceneMouseMove:
 742         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 743     case QEvent::GraphicsSceneMouseRelease:
 744         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 745     case QEvent::GraphicsSceneMouseDoubleClick:
 746         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 747     case QEvent::GraphicsSceneWheel:
 748          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 749     case QEvent::GraphicsSceneDragEnter:
 750         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 751     case QEvent::GraphicsSceneDragLeave:
 752         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 753     case QEvent::GraphicsSceneDragMove:
 754         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 755     case QEvent::GraphicsSceneDrop:
 756         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 757     case QEvent::GraphicsSceneHoverEnter:
 758         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 759     case QEvent::GraphicsSceneHoverMove:
 760         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 761     case QEvent::GraphicsSceneHoverLeave:
 762         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 763     case QEvent::GraphicsSceneResize:
 764         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 765     default:
 766         break;
 767     }
 768
 769     return false;
 770 }
 771
 772 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 773 {
 774     if (!m_view) {
 775         return;
 776     }
 777
 778     KItemListRubberBand* rubberBand = m_view->rubberBand();
 779     if (rubberBand->isActive()) {
 780         const qreal diff = current - previous;
 781         // TODO: Ideally just QCursor::pos() should be used as
 782         // new end-position but it seems there is no easy way
 783         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 784         // (... or I just missed an easy way to do the mapping)
 785         QPointF endPos = rubberBand->endPosition();
 786         if (m_view->scrollOrientation() == Qt::Vertical) {
 787             endPos.ry() += diff;
 788         } else {
 789             endPos.rx() += diff;
 790         }
 791
 792         rubberBand->setEndPosition(endPos);
 793     }
 794 }
 795
 796 void KItemListController::slotRubberBandChanged()
 797 {
 798     if (!m_view || !m_model || m_model->count() <= 0) {
 799         return;
 800     }
 801
 802     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 803     const QPointF startPos = rubberBand->startPosition();
 804     const QPointF endPos = rubberBand->endPosition();
 805     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 806
 807     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 808     if (scrollVertical) {
 809         rubberBandRect.translate(0, -m_view->scrollOffset());
 810     } else {
 811         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 812     }
 813
 814     if (!m_oldSelection.isEmpty()) {
 815         // Clear the old selection that was available before the rubberband has
 816         // been activated in case if no Shift- or Control-key are pressed
 817         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 818                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 819         if (!shiftOrControlPressed) {
 820             m_oldSelection.clear();
 821         }
 822     }
 823
 824     QSet<int> selectedItems;
 825
 826     // Select all visible items that intersect with the rubberband
 827     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 828         const int index = widget->index();
 829
 830         const QRectF widgetRect = m_view->itemRect(index);
 831         if (widgetRect.intersects(rubberBandRect)) {
 832             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 833             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 834             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 835                 selectedItems.insert(index);
 836             }
 837         }
 838     }
 839
 840     // Select all invisible items that intersect with the rubberband. Instead of
 841     // iterating all items only the area which might be touched by the rubberband
 842     // will be checked.
 843     const bool increaseIndex = scrollVertical ?
 844                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 845
 846     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 847     bool selectionFinished = false;
 848     do {
 849         const QRectF widgetRect = m_view->itemRect(index);
 850         if (widgetRect.intersects(rubberBandRect)) {
 851             selectedItems.insert(index);
 852         }
 853
 854         if (increaseIndex) {
 855             ++index;
 856             selectionFinished = (index >= m_model->count()) ||
 857                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 858                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 859         } else {
 860             --index;
 861             selectionFinished = (index < 0) ||
 862                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 863                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 864         }
 865     } while (!selectionFinished);
 866
 867     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 868         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 869         // Therefore, the new selection contains:
 870         // 1. All previously selected items which are not inside the rubberband, and
 871         // 2. all items inside the rubberband which have not been selected previously.
 872         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 873     }
 874     else {
 875         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 876     }
 877 }
 878
 879 void KItemListController::startDragging()
 880 {
 881     if (!m_view || !m_model) {
 882         return;
 883     }
 884
 885     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 886     if (selectedItems.isEmpty()) {
 887         return;
 888     }
 889
 890     QMimeData* data = m_model->createMimeData(selectedItems);
 891     if (!data) {
 892         return;
 893     }
 894
 895     // The created drag object will be owned and deleted
 896     // by QApplication::activeWindow().
 897     QDrag* drag = new QDrag(QApplication::activeWindow());
 898     drag->setMimeData(data);
 899
 900     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 901     drag->setPixmap(pixmap);
 902
 903     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 904 }
 905
 906 KItemListWidget* KItemListController::hoveredWidget() const
 907 {
 908     Q_ASSERT(m_view);
 909
 910     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 911         if (widget->isHovered()) {
 912             return widget;
 913         }
 914     }
 915
 916     return 0;
 917 }
 918
 919 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 920 {
 921     Q_ASSERT(m_view);
 922
 923     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 924         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 925
 926         const bool hovered = widget->contains(mappedPos) &&
 927                              !widget->expansionToggleRect().contains(mappedPos);
 928         if (hovered) {
 929             return widget;
 930         }
 931     }
 932
 933     return 0;
 934 }
 935
 936 #include "kitemlistcontroller.moc"