src/kitemviews/kitemlistcontroller.cpp

   1 /*
   2  * SPDX-FileCopyrightText: 2011 Peter Penz <peter.penz19@gmail.com>
   3  * SPDX-FileCopyrightText: 2012 Frank Reininghaus <frank78ac@googlemail.com>
   4  *
   5  * Based on the Itemviews NG project from Trolltech Labs
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #include "kitemlistcontroller.h"
  11
  12 #include "kitemlistselectionmanager.h"
  13 #include "kitemlistview.h"
  14 #include "private/kitemlistkeyboardsearchmanager.h"
  15 #include "private/kitemlistrubberband.h"
  16 #include "private/ktwofingerswipe.h"
  17 #include "private/ktwofingertap.h"
  18 #include "views/draganddrophelper.h"
  19
  20 #include <QAccessible>
  21 #include <QApplication>
  22 #include <QDrag>
  23 #include <QGesture>
  24 #include <QGraphicsScene>
  25 #include <QGraphicsSceneEvent>
  26 #include <QGraphicsView>
  27 #include <QMimeData>
  28 #include <QTimer>
  29 #include <QTouchEvent>
  30
  31 KItemListController::KItemListController(KItemModelBase* model, KItemListView* view, QObject* parent) :
  32     QObject(parent),
  33     m_singleClickActivationEnforced(false),
  34     m_selectionTogglePressed(false),
  35     m_clearSelectionIfItemsAreNotDragged(false),
  36     m_isSwipeGesture(false),
  37     m_dragActionOrRightClick(false),
  38     m_scrollerIsScrolling(false),
  39     m_pinchGestureInProgress(false),
  40     m_mousePress(false),
  41     m_isTouchEvent(false),
  42     m_selectionBehavior(NoSelection),
  43     m_autoActivationBehavior(ActivationAndExpansion),
  44     m_mouseDoubleClickAction(ActivateItemOnly),
  45     m_model(nullptr),
  46     m_view(nullptr),
  47     m_selectionManager(new KItemListSelectionManager(this)),
  48     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  49     m_pressedIndex(-1),
  50     m_pressedMousePos(),
  51     m_autoActivationTimer(nullptr),
  52     m_swipeGesture(Qt::CustomGesture),
  53     m_twoFingerTapGesture(Qt::CustomGesture),
  54     m_oldSelection(),
  55     m_keyboardAnchorIndex(-1),
  56     m_keyboardAnchorPos(0)
  57 {
  58     connect(m_keyboardManager, &KItemListKeyboardSearchManager::changeCurrentItem,
  59             this, &KItemListController::slotChangeCurrentItem);
  60     connect(m_selectionManager, &KItemListSelectionManager::currentChanged,
  61             m_keyboardManager, &KItemListKeyboardSearchManager::slotCurrentChanged);
  62     connect(m_selectionManager, &KItemListSelectionManager::selectionChanged,
  63             m_keyboardManager, &KItemListKeyboardSearchManager::slotSelectionChanged);
  64
  65     m_autoActivationTimer = new QTimer(this);
  66     m_autoActivationTimer->setSingleShot(true);
  67     m_autoActivationTimer->setInterval(-1);
  68     connect(m_autoActivationTimer, &QTimer::timeout, this, &KItemListController::slotAutoActivationTimeout);
  69
  70     setModel(model);
  71     setView(view);
  72
  73     m_swipeGesture = QGestureRecognizer::registerRecognizer(new KTwoFingerSwipeRecognizer());
  74     m_twoFingerTapGesture = QGestureRecognizer::registerRecognizer(new KTwoFingerTapRecognizer());
  75     view->grabGesture(m_swipeGesture);
  76     view->grabGesture(m_twoFingerTapGesture);
  77     view->grabGesture(Qt::TapGesture);
  78     view->grabGesture(Qt::TapAndHoldGesture);
  79     view->grabGesture(Qt::PinchGesture);
  80 }
  81
  82 KItemListController::~KItemListController()
  83 {
  84     setView(nullptr);
  85     Q_ASSERT(!m_view);
  86
  87     setModel(nullptr);
  88     Q_ASSERT(!m_model);
  89 }
  90
  91 void KItemListController::setModel(KItemModelBase* model)
  92 {
  93     if (m_model == model) {
  94         return;
  95     }
  96
  97     KItemModelBase* oldModel = m_model;
  98     if (oldModel) {
  99         oldModel->deleteLater();
 100     }
 101
 102     m_model = model;
 103     if (m_model) {
 104         m_model->setParent(this);
 105     }
 106
 107     if (m_view) {
 108         m_view->setModel(m_model);
 109     }
 110
 111     m_selectionManager->setModel(m_model);
 112
 113     Q_EMIT modelChanged(m_model, oldModel);
 114 }
 115
 116 KItemModelBase* KItemListController::model() const
 117 {
 118     return m_model;
 119 }
 120
 121 KItemListSelectionManager* KItemListController::selectionManager() const
 122 {
 123     return m_selectionManager;
 124 }
 125
 126 void KItemListController::setView(KItemListView* view)
 127 {
 128     if (m_view == view) {
 129         return;
 130     }
 131
 132     KItemListView* oldView = m_view;
 133     if (oldView) {
 134         disconnect(oldView, &KItemListView::scrollOffsetChanged, this, &KItemListController::slotViewScrollOffsetChanged);
 135         oldView->deleteLater();
 136     }
 137
 138     m_view = view;
 139
 140     if (m_view) {
 141         m_view->setParent(this);
 142         m_view->setController(this);
 143         m_view->setModel(m_model);
 144         connect(m_view, &KItemListView::scrollOffsetChanged, this, &KItemListController::slotViewScrollOffsetChanged);
 145         updateExtendedSelectionRegion();
 146     }
 147
 148     Q_EMIT viewChanged(m_view, oldView);
 149 }
 150
 151 KItemListView* KItemListController::view() const
 152 {
 153     return m_view;
 154 }
 155
 156 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 157 {
 158     m_selectionBehavior = behavior;
 159     updateExtendedSelectionRegion();
 160 }
 161
 162 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 163 {
 164     return m_selectionBehavior;
 165 }
 166
 167 void KItemListController::setAutoActivationBehavior(AutoActivationBehavior behavior)
 168 {
 169     m_autoActivationBehavior = behavior;
 170 }
 171
 172 KItemListController::AutoActivationBehavior KItemListController::autoActivationBehavior() const
 173 {
 174     return m_autoActivationBehavior;
 175 }
 176
 177 void KItemListController::setMouseDoubleClickAction(MouseDoubleClickAction action)
 178 {
 179     m_mouseDoubleClickAction = action;
 180 }
 181
 182 KItemListController::MouseDoubleClickAction KItemListController::mouseDoubleClickAction() const
 183 {
 184     return m_mouseDoubleClickAction;
 185 }
 186
 187 int KItemListController::indexCloseToMousePressedPosition() const
 188 {
 189     QHashIterator<KItemListWidget*, KItemListGroupHeader*> it(m_view->m_visibleGroups);
 190     while (it.hasNext()) {
 191         it.next();
 192         KItemListGroupHeader *groupHeader = it.value();
 193         const QPointF mappedToGroup = groupHeader->mapFromItem(nullptr, m_pressedMousePos);
 194         if (groupHeader->contains(mappedToGroup)) {
 195             return it.key()->index();
 196         }
 197     }
 198     return -1;
 199 }
 200
 201 void KItemListController::setAutoActivationDelay(int delay)
 202 {
 203     m_autoActivationTimer->setInterval(delay);
 204 }
 205
 206 int KItemListController::autoActivationDelay() const
 207 {
 208     return m_autoActivationTimer->interval();
 209 }
 210
 211 void KItemListController::setSingleClickActivationEnforced(bool singleClick)
 212 {
 213     m_singleClickActivationEnforced = singleClick;
 214 }
 215
 216 bool KItemListController::singleClickActivationEnforced() const
 217 {
 218     return m_singleClickActivationEnforced;
 219 }
 220
 221 bool KItemListController::keyPressEvent(QKeyEvent* event)
 222 {
 223     int index = m_selectionManager->currentItem();
 224     int key = event->key();
 225
 226     // Handle the expanding/collapsing of items
 227     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 228         if (key == Qt::Key_Right) {
 229             if (m_model->setExpanded(index, true)) {
 230                 return true;
 231             }
 232         } else if (key == Qt::Key_Left) {
 233             if (m_model->setExpanded(index, false)) {
 234                 return true;
 235             }
 236         }
 237     }
 238
 239     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 240     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 241     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 242     const bool navigationPressed = key == Qt::Key_Home || key == Qt::Key_End  ||
 243                                    key == Qt::Key_PageUp || key == Qt::Key_PageDown ||
 244                                    key == Qt::Key_Up || key == Qt::Key_Down ||
 245                                    key == Qt::Key_Left || key == Qt::Key_Right;
 246
 247     const int itemCount = m_model->count();
 248
 249     // For horizontal scroll orientation, transform
 250     // the arrow keys to simplify the event handling.
 251     if (m_view->scrollOrientation() == Qt::Horizontal) {
 252         switch (key) {
 253         case Qt::Key_Up:    key = Qt::Key_Left; break;
 254         case Qt::Key_Down:  key = Qt::Key_Right; break;
 255         case Qt::Key_Left:  key = Qt::Key_Up; break;
 256         case Qt::Key_Right: key = Qt::Key_Down; break;
 257         default:            break;
 258         }
 259     }
 260
 261     const bool selectSingleItem = m_selectionBehavior != NoSelection && itemCount == 1 && navigationPressed;
 262
 263     if (selectSingleItem) {
 264         const int current = m_selectionManager->currentItem();
 265         m_selectionManager->setSelected(current);
 266         return true;
 267     }
 268
 269     switch (key) {
 270     case Qt::Key_Home:
 271         index = 0;
 272         m_keyboardAnchorIndex = index;
 273         m_keyboardAnchorPos = keyboardAnchorPos(index);
 274         break;
 275
 276     case Qt::Key_End:
 277         index = itemCount - 1;
 278         m_keyboardAnchorIndex = index;
 279         m_keyboardAnchorPos = keyboardAnchorPos(index);
 280         break;
 281
 282     case Qt::Key_Left:
 283         if (index > 0) {
 284             const int expandedParentsCount = m_model->expandedParentsCount(index);
 285             if (expandedParentsCount == 0) {
 286                 --index;
 287             } else {
 288                 // Go to the parent of the current item.
 289                 do {
 290                     --index;
 291                 } while (index > 0 && m_model->expandedParentsCount(index) == expandedParentsCount);
 292             }
 293             m_keyboardAnchorIndex = index;
 294             m_keyboardAnchorPos = keyboardAnchorPos(index);
 295         }
 296         break;
 297
 298     case Qt::Key_Right:
 299         if (index < itemCount - 1) {
 300             ++index;
 301             m_keyboardAnchorIndex = index;
 302             m_keyboardAnchorPos = keyboardAnchorPos(index);
 303         }
 304         break;
 305
 306     case Qt::Key_Up:
 307         updateKeyboardAnchor();
 308         index = previousRowIndex(index);
 309         break;
 310
 311     case Qt::Key_Down:
 312         updateKeyboardAnchor();
 313         index = nextRowIndex(index);
 314         break;
 315
 316     case Qt::Key_PageUp:
 317         if (m_view->scrollOrientation() == Qt::Horizontal) {
 318             // The new current index should correspond to the first item in the current column.
 319             int newIndex = qMax(index - 1, 0);
 320             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() < m_view->itemRect(index).topLeft().y()) {
 321                 index = newIndex;
 322                 newIndex = qMax(index - 1, 0);
 323             }
 324             m_keyboardAnchorIndex = index;
 325             m_keyboardAnchorPos = keyboardAnchorPos(index);
 326         } else {
 327             const qreal currentItemBottom = m_view->itemRect(index).bottomLeft().y();
 328             const qreal height = m_view->geometry().height();
 329
 330             // The new current item should be the first item in the current
 331             // column whose itemRect's top coordinate is larger than targetY.
 332             const qreal targetY = currentItemBottom - height;
 333
 334             updateKeyboardAnchor();
 335             int newIndex = previousRowIndex(index);
 336             do {
 337                 index = newIndex;
 338                 updateKeyboardAnchor();
 339                 newIndex = previousRowIndex(index);
 340             } while (m_view->itemRect(newIndex).topLeft().y() > targetY && newIndex != index);
 341         }
 342         break;
 343
 344     case Qt::Key_PageDown:
 345         if (m_view->scrollOrientation() == Qt::Horizontal) {
 346             // The new current index should correspond to the last item in the current column.
 347             int newIndex = qMin(index + 1, m_model->count() - 1);
 348             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() > m_view->itemRect(index).topLeft().y()) {
 349                 index = newIndex;
 350                 newIndex = qMin(index + 1, m_model->count() - 1);
 351             }
 352             m_keyboardAnchorIndex = index;
 353             m_keyboardAnchorPos = keyboardAnchorPos(index);
 354         } else {
 355             const qreal currentItemTop = m_view->itemRect(index).topLeft().y();
 356             const qreal height = m_view->geometry().height();
 357
 358             // The new current item should be the last item in the current
 359             // column whose itemRect's bottom coordinate is smaller than targetY.
 360             const qreal targetY = currentItemTop + height;
 361
 362             updateKeyboardAnchor();
 363             int newIndex = nextRowIndex(index);
 364             do {
 365                 index = newIndex;
 366                 updateKeyboardAnchor();
 367                 newIndex = nextRowIndex(index);
 368             } while (m_view->itemRect(newIndex).bottomLeft().y() < targetY && newIndex != index);
 369         }
 370         break;
 371
 372     case Qt::Key_Enter:
 373     case Qt::Key_Return: {
 374         const KItemSet selectedItems = m_selectionManager->selectedItems();
 375         if (selectedItems.count() >= 2) {
 376             Q_EMIT itemsActivated(selectedItems);
 377         } else if (selectedItems.count() == 1) {
 378             Q_EMIT itemActivated(selectedItems.first());
 379         } else {
 380             Q_EMIT itemActivated(index);
 381         }
 382         break;
 383     }
 384
 385     case Qt::Key_Menu: {
 386         // Emit the signal itemContextMenuRequested() in case if at least one
 387         // item is selected. Otherwise the signal viewContextMenuRequested() will be emitted.
 388         const KItemSet selectedItems = m_selectionManager->selectedItems();
 389         int index = -1;
 390         if (selectedItems.count() >= 2) {
 391             const int currentItemIndex = m_selectionManager->currentItem();
 392             index = selectedItems.contains(currentItemIndex)
 393                     ? currentItemIndex : selectedItems.first();
 394         } else if (selectedItems.count() == 1) {
 395             index = selectedItems.first();
 396         }
 397
 398         if (index >= 0) {
 399             const QRectF contextRect = m_view->itemContextRect(index);
 400             const QPointF pos(m_view->scene()->views().first()->mapToGlobal(contextRect.bottomRight().toPoint()));
 401             Q_EMIT itemContextMenuRequested(index, pos);
 402         } else {
 403             Q_EMIT viewContextMenuRequested(QCursor::pos());
 404         }
 405         break;
 406     }
 407
 408     case Qt::Key_Escape:
 409         if (m_selectionBehavior != SingleSelection) {
 410             m_selectionManager->clearSelection();
 411         }
 412         m_keyboardManager->cancelSearch();
 413         Q_EMIT escapePressed();
 414         break;
 415
 416     case Qt::Key_Space:
 417         if (m_selectionBehavior == MultiSelection) {
 418             if (controlPressed) {
 419                 // Toggle the selection state of the current item.
 420                 m_selectionManager->endAnchoredSelection();
 421                 m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 422                 m_selectionManager->beginAnchoredSelection(index);
 423                 break;
 424             } else {
 425                 // Select the current item if it is not selected yet.
 426                 const int current = m_selectionManager->currentItem();
 427                 if (!m_selectionManager->isSelected(current)) {
 428                     m_selectionManager->setSelected(current);
 429                     break;
 430                 }
 431             }
 432         }
 433         Q_FALLTHROUGH();  // fall through to the default case and add the Space to the current search string.
 434     default:
 435         m_keyboardManager->addKeys(event->text());
 436         // Make sure unconsumed events get propagated up the chain. #302329
 437         event->ignore();
 438         return false;
 439     }
 440
 441     if (m_selectionManager->currentItem() != index) {
 442         switch (m_selectionBehavior) {
 443         case NoSelection:
 444             m_selectionManager->setCurrentItem(index);
 445             break;
 446
 447         case SingleSelection:
 448             m_selectionManager->setCurrentItem(index);
 449             m_selectionManager->clearSelection();
 450             m_selectionManager->setSelected(index, 1);
 451             break;
 452
 453         case MultiSelection:
 454             if (controlPressed) {
 455                 m_selectionManager->endAnchoredSelection();
 456             }
 457
 458             m_selectionManager->setCurrentItem(index);
 459
 460             if (!shiftOrControlPressed) {
 461                 m_selectionManager->clearSelection();
 462                 m_selectionManager->setSelected(index, 1);
 463             }
 464
 465             if (!shiftPressed) {
 466                 m_selectionManager->beginAnchoredSelection(index);
 467             }
 468             break;
 469         }
 470     }
 471
 472     if (navigationPressed) {
 473         m_view->scrollToItem(index);
 474     }
 475     return true;
 476 }
 477
 478 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 479 {
 480     if (!m_model || m_model->count() == 0) {
 481         return;
 482     }
 483     int index;
 484     if (searchFromNextItem) {
 485         const int currentIndex = m_selectionManager->currentItem();
 486         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 487     } else {
 488         index = m_model->indexForKeyboardSearch(text, 0);
 489     }
 490     if (index >= 0) {
 491         m_selectionManager->setCurrentItem(index);
 492
 493         if (m_selectionBehavior != NoSelection) {
 494             m_selectionManager->replaceSelection(index);
 495             m_selectionManager->beginAnchoredSelection(index);
 496         }
 497
 498         m_view->scrollToItem(index);
 499     }
 500 }
 501
 502 void KItemListController::slotAutoActivationTimeout()
 503 {
 504     if (!m_model || !m_view) {
 505         return;
 506     }
 507
 508     const int index = m_autoActivationTimer->property("index").toInt();
 509     if (index < 0 || index >= m_model->count()) {
 510         return;
 511     }
 512
 513     /* m_view->isUnderMouse() fixes a bug in the Folder-View-Panel and in the
 514      * Places-Panel.
 515      *
 516      * Bug: When you drag a file onto a Folder-View-Item or a Places-Item and
 517      * then move away before the auto-activation timeout triggers, than the
 518      * item still becomes activated/expanded.
 519      *
 520      * See Bug 293200 and 305783
 521      */
 522     if (m_model->supportsDropping(index) && m_view->isUnderMouse()) {
 523         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 524             const bool expanded = m_model->isExpanded(index);
 525             m_model->setExpanded(index, !expanded);
 526         } else if (m_autoActivationBehavior != ExpansionOnly) {
 527             Q_EMIT itemActivated(index);
 528         }
 529     }
 530 }
 531
 532 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 533 {
 534     Q_UNUSED(event)
 535     return false;
 536 }
 537
 538 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 539 {
 540     m_mousePress = true;
 541
 542     if (event->source() == Qt::MouseEventSynthesizedByQt && m_isTouchEvent) {
 543         return false;
 544     }
 545
 546     if (!m_view) {
 547         return false;
 548     }
 549
 550     m_pressedMousePos = transform.map(event->pos());
 551     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 552
 553     const Qt::MouseButtons buttons = event->buttons();
 554
 555     if (!onPress(event->screenPos(), event->pos(), event->modifiers(), buttons)) {
 556         startRubberBand();
 557         return false;
 558     }
 559
 560     return true;
 561 }
 562
 563 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 564 {
 565     if (!m_view) {
 566         return false;
 567     }
 568
 569     if (m_view->m_tapAndHoldIndicator->isActive()) {
 570         m_view->m_tapAndHoldIndicator->setActive(false);
 571     }
 572
 573     if (event->source() == Qt::MouseEventSynthesizedByQt && !m_dragActionOrRightClick && m_isTouchEvent) {
 574         return false;
 575     }
 576
 577     if (m_pressedIndex >= 0) {
 578         // Check whether a dragging should be started
 579         if (event->buttons() & Qt::LeftButton) {
 580             const QPointF pos = transform.map(event->pos());
 581             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 582                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 583                     // Always assure that the dragged item gets selected. Usually this is already
 584                     // done on the mouse-press event, but when using the selection-toggle on a
 585                     // selected item the dragged item is not selected yet.
 586                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 587                 } else {
 588                     // A selected item has been clicked to drag all selected items
 589                     // -> the selection should not be cleared when the mouse button is released.
 590                     m_clearSelectionIfItemsAreNotDragged = false;
 591                 }
 592                 startDragging();
 593                 m_mousePress = false;
 594             }
 595         }
 596     } else {
 597         KItemListRubberBand* rubberBand = m_view->rubberBand();
 598         if (rubberBand->isActive()) {
 599             QPointF endPos = transform.map(event->pos());
 600
 601             // Update the current item.
 602             const int newCurrent = m_view->itemAt(endPos);
 603             if (newCurrent >= 0) {
 604                 // It's expected that the new current index is also the new anchor (bug 163451).
 605                 m_selectionManager->endAnchoredSelection();
 606                 m_selectionManager->setCurrentItem(newCurrent);
 607                 m_selectionManager->beginAnchoredSelection(newCurrent);
 608             }
 609
 610             if (m_view->scrollOrientation() == Qt::Vertical) {
 611                 endPos.ry() += m_view->scrollOffset();
 612                 if (m_view->itemSize().width() < 0) {
 613                     // Use a special rubberband for views that have only one column and
 614                     // expand the rubberband to use the whole width of the view.
 615                     endPos.setX(m_view->size().width());
 616                 }
 617             } else {
 618                 endPos.rx() += m_view->scrollOffset();
 619             }
 620             rubberBand->setEndPosition(endPos);
 621         }
 622     }
 623
 624     return false;
 625 }
 626
 627 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 628 {
 629     m_mousePress = false;
 630     m_isTouchEvent = false;
 631
 632     if (!m_view) {
 633         return false;
 634     }
 635
 636     if (m_view->m_tapAndHoldIndicator->isActive()) {
 637         m_view->m_tapAndHoldIndicator->setActive(false);
 638     }
 639
 640     KItemListRubberBand* rubberBand = m_view->rubberBand();
 641     if (event->source() == Qt::MouseEventSynthesizedByQt && !rubberBand->isActive() && m_isTouchEvent) {
 642         return false;
 643     }
 644
 645     Q_EMIT mouseButtonReleased(m_pressedIndex, event->buttons());
 646
 647     return onRelease(transform.map(event->pos()), event->modifiers(), event->button(), false);
 648 }
 649
 650 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 651 {
 652     const QPointF pos = transform.map(event->pos());
 653     const int index = m_view->itemAt(pos);
 654
 655     // Expand item if desired - See Bug 295573
 656     if (m_mouseDoubleClickAction != ActivateItemOnly) {
 657         if (m_view && m_model && m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 658             const bool expanded = m_model->isExpanded(index);
 659             m_model->setExpanded(index, !expanded);
 660         }
 661     }
 662
 663     if (event->button() & Qt::RightButton) {
 664         m_selectionManager->clearSelection();
 665         if (index >= 0) {
 666             m_selectionManager->setSelected(index);
 667             Q_EMIT itemContextMenuRequested(index, event->screenPos());
 668         } else {
 669             const QRectF headerBounds = m_view->headerBoundaries();
 670             if (headerBounds.contains(event->pos())) {
 671                 Q_EMIT headerContextMenuRequested(event->screenPos());
 672             } else {
 673                 Q_EMIT viewContextMenuRequested(event->screenPos());
 674             }
 675         }
 676         return true;
 677     }
 678
 679     bool emitItemActivated = !(m_view->style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick) || m_singleClickActivationEnforced) &&
 680                              (event->button() & Qt::LeftButton) &&
 681                              index >= 0 && index < m_model->count();
 682     if (emitItemActivated) {
 683         Q_EMIT itemActivated(index);
 684     }
 685     return false;
 686 }
 687
 688 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 689 {
 690     Q_UNUSED(event)
 691     Q_UNUSED(transform)
 692
 693     DragAndDropHelper::clearUrlListMatchesUrlCache();
 694
 695     return false;
 696 }
 697
 698 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 699 {
 700     Q_UNUSED(event)
 701     Q_UNUSED(transform)
 702
 703     m_autoActivationTimer->stop();
 704     m_view->setAutoScroll(false);
 705     m_view->hideDropIndicator();
 706
 707     KItemListWidget* widget = hoveredWidget();
 708     if (widget) {
 709         widget->setHovered(false);
 710         Q_EMIT itemUnhovered(widget->index());
 711     }
 712     return false;
 713 }
 714
 715 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 716 {
 717     if (!m_model || !m_view) {
 718         return false;
 719     }
 720
 721
 722     QUrl hoveredDir = m_model->directory();
 723     KItemListWidget* oldHoveredWidget = hoveredWidget();
 724
 725     const QPointF pos = transform.map(event->pos());
 726     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 727
 728     if (oldHoveredWidget != newHoveredWidget) {
 729         m_autoActivationTimer->stop();
 730
 731         if (oldHoveredWidget) {
 732             oldHoveredWidget->setHovered(false);
 733             Q_EMIT itemUnhovered(oldHoveredWidget->index());
 734         }
 735     }
 736
 737     if (newHoveredWidget) {
 738         bool droppingBetweenItems = false;
 739         if (m_model->sortRole().isEmpty()) {
 740             // The model supports inserting items between other items.
 741             droppingBetweenItems = (m_view->showDropIndicator(pos) >= 0);
 742         }
 743
 744         const int index = newHoveredWidget->index();
 745
 746         if (m_model->isDir(index)) {
 747             hoveredDir = m_model->url(index);
 748         }
 749
 750         if (!droppingBetweenItems) {
 751             if (m_model->supportsDropping(index)) {
 752                 // Something has been dragged on an item.
 753                 m_view->hideDropIndicator();
 754                 if (!newHoveredWidget->isHovered()) {
 755                     newHoveredWidget->setHovered(true);
 756                     Q_EMIT itemHovered(index);
 757                 }
 758
 759                 if (!m_autoActivationTimer->isActive() && m_autoActivationTimer->interval() >= 0) {
 760                     m_autoActivationTimer->setProperty("index", index);
 761                     m_autoActivationTimer->start();
 762                 }
 763             }
 764         } else {
 765             m_autoActivationTimer->stop();
 766             if (newHoveredWidget && newHoveredWidget->isHovered()) {
 767                 newHoveredWidget->setHovered(false);
 768                 Q_EMIT itemUnhovered(index);
 769             }
 770         }
 771     } else {
 772         m_view->hideDropIndicator();
 773     }
 774
 775     if (DragAndDropHelper::urlListMatchesUrl(event->mimeData()->urls(), hoveredDir)) {
 776         event->setDropAction(Qt::IgnoreAction);
 777         event->ignore();
 778     } else {
 779         event->setDropAction(event->proposedAction());
 780         event->accept();
 781     }
 782     return false;
 783 }
 784
 785 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 786 {
 787     if (!m_view) {
 788         return false;
 789     }
 790
 791     m_autoActivationTimer->stop();
 792     m_view->setAutoScroll(false);
 793
 794     const QPointF pos = transform.map(event->pos());
 795
 796     int dropAboveIndex = -1;
 797     if (m_model->sortRole().isEmpty()) {
 798         // The model supports inserting of items between other items.
 799         dropAboveIndex = m_view->showDropIndicator(pos);
 800     }
 801
 802     if (dropAboveIndex >= 0) {
 803         // Something has been dropped between two items.
 804         m_view->hideDropIndicator();
 805         Q_EMIT aboveItemDropEvent(dropAboveIndex, event);
 806     } else if (!event->mimeData()->hasFormat(m_model->blacklistItemDropEventMimeType())) {
 807         // Something has been dropped on an item or on an empty part of the view.
 808         Q_EMIT itemDropEvent(m_view->itemAt(pos), event);
 809     }
 810
 811     QAccessibleEvent accessibilityEvent(view(), QAccessible::DragDropEnd);
 812     QAccessible::updateAccessibility(&accessibilityEvent);
 813
 814     return true;
 815 }
 816
 817 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 818 {
 819     Q_UNUSED(event)
 820     Q_UNUSED(transform)
 821     return false;
 822 }
 823
 824 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 825 {
 826     Q_UNUSED(transform)
 827     if (!m_model || !m_view) {
 828         return false;
 829     }
 830
 831     KItemListWidget* oldHoveredWidget = hoveredWidget();
 832     const QPointF pos = transform.map(event->pos());
 833     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 834
 835     if (oldHoveredWidget != newHoveredWidget) {
 836         if (oldHoveredWidget) {
 837             oldHoveredWidget->setHovered(false);
 838             Q_EMIT itemUnhovered(oldHoveredWidget->index());
 839         }
 840
 841         if (newHoveredWidget) {
 842             newHoveredWidget->setHovered(true);
 843             const QPointF mappedPos = newHoveredWidget->mapFromItem(m_view, pos);
 844             newHoveredWidget->setHoverPosition(mappedPos);
 845             Q_EMIT itemHovered(newHoveredWidget->index());
 846         }
 847     } else if (oldHoveredWidget) {
 848         const QPointF mappedPos = oldHoveredWidget->mapFromItem(m_view, pos);
 849         oldHoveredWidget->setHoverPosition(mappedPos);
 850     }
 851
 852     return false;
 853 }
 854
 855 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 856 {
 857     Q_UNUSED(event)
 858     Q_UNUSED(transform)
 859
 860     m_mousePress = false;
 861     m_isTouchEvent = false;
 862
 863     if (!m_model || !m_view) {
 864         return false;
 865     }
 866
 867     const auto widgets = m_view->visibleItemListWidgets();
 868     for (KItemListWidget* widget : widgets) {
 869         if (widget->isHovered()) {
 870             widget->setHovered(false);
 871             Q_EMIT itemUnhovered(widget->index());
 872         }
 873     }
 874     return false;
 875 }
 876
 877 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 878 {
 879     Q_UNUSED(event)
 880     Q_UNUSED(transform)
 881     return false;
 882 }
 883
 884 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 885 {
 886     Q_UNUSED(event)
 887     Q_UNUSED(transform)
 888     return false;
 889 }
 890
 891 bool KItemListController::gestureEvent(QGestureEvent* event, const QTransform& transform)
 892 {
 893     if (!m_view) {
 894         return false;
 895     }
 896
 897     //you can touch on different views at the same time, but only one QWidget gets a mousePressEvent
 898     //we use this to get the right QWidget
 899     //the only exception is a tap gesture with state GestureStarted, we need to reset some variable
 900     if (!m_mousePress) {
 901         if (QGesture* tap = event->gesture(Qt::TapGesture)) {
 902             QTapGesture* tapGesture = static_cast<QTapGesture*>(tap);
 903             if (tapGesture->state() == Qt::GestureStarted) {
 904                 tapTriggered(tapGesture, transform);
 905             }
 906         }
 907         return false;
 908     }
 909
 910     bool accepted = false;
 911
 912     if (QGesture* tap = event->gesture(Qt::TapGesture)) {
 913         tapTriggered(static_cast<QTapGesture*>(tap), transform);
 914         accepted = true;
 915     }
 916     if (event->gesture(Qt::TapAndHoldGesture)) {
 917         tapAndHoldTriggered(event, transform);
 918         accepted = true;
 919     }
 920     if (event->gesture(Qt::PinchGesture)) {
 921         pinchTriggered(event, transform);
 922         accepted = true;
 923     }
 924     if (event->gesture(m_swipeGesture)) {
 925         swipeTriggered(event, transform);
 926         accepted = true;
 927     }
 928     if (event->gesture(m_twoFingerTapGesture)) {
 929         twoFingerTapTriggered(event, transform);
 930         accepted = true;
 931     }
 932     return accepted;
 933 }
 934
 935 bool KItemListController::touchBeginEvent(QTouchEvent* event, const QTransform& transform)
 936 {
 937     Q_UNUSED(event)
 938     Q_UNUSED(transform)
 939
 940     m_isTouchEvent = true;
 941     return false;
 942 }
 943
 944 void KItemListController::tapTriggered(QTapGesture* tap, const QTransform& transform)
 945 {
 946     static bool scrollerWasActive = false;
 947
 948     if (tap->state() == Qt::GestureStarted) {
 949         m_dragActionOrRightClick = false;
 950         m_isSwipeGesture = false;
 951         m_pinchGestureInProgress = false;
 952         scrollerWasActive = m_scrollerIsScrolling;
 953     }
 954
 955     if (tap->state() == Qt::GestureFinished) {
 956         m_mousePress = false;
 957
 958         //if at the moment of the gesture start the QScroller was active, the user made the tap
 959         //to stop the QScroller and not to tap on an item
 960         if (scrollerWasActive) {
 961             return;
 962         }
 963
 964         if (m_view->m_tapAndHoldIndicator->isActive()) {
 965             m_view->m_tapAndHoldIndicator->setActive(false);
 966         }
 967
 968         m_pressedMousePos = transform.map(tap->position());
 969         m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 970
 971         if (m_dragActionOrRightClick) {
 972             onPress(tap->hotSpot().toPoint(), tap->position().toPoint(), Qt::NoModifier, Qt::RightButton);
 973             onRelease(transform.map(tap->position()), Qt::NoModifier, Qt::RightButton, false);
 974             m_dragActionOrRightClick = false;
 975         }
 976         else {
 977             onPress(tap->hotSpot().toPoint(), tap->position().toPoint(), Qt::NoModifier, Qt::LeftButton);
 978             onRelease(transform.map(tap->position()), Qt::NoModifier, Qt::LeftButton, true);
 979         }
 980         m_isTouchEvent = false;
 981     }
 982 }
 983
 984 void KItemListController::tapAndHoldTriggered(QGestureEvent* event, const QTransform& transform)
 985 {
 986
 987     //the Qt TabAndHold gesture is triggerable with a mouse click, we don't want this
 988     if (!m_isTouchEvent) {
 989         return;
 990     }
 991
 992     const QTapAndHoldGesture* tap = static_cast<QTapAndHoldGesture*>(event->gesture(Qt::TapAndHoldGesture));
 993     if (tap->state() == Qt::GestureFinished) {
 994         //if a pinch gesture is in progress we don't want a TabAndHold gesture
 995         if (m_pinchGestureInProgress) {
 996             return;
 997         }
 998         m_pressedMousePos = transform.map(event->mapToGraphicsScene(tap->position()));
 999         m_pressedIndex = m_view->itemAt(m_pressedMousePos);
1000
1001         if (m_pressedIndex >= 0 && !m_selectionManager->isSelected(m_pressedIndex)) {
1002             m_selectionManager->clearSelection();
1003             m_selectionManager->setSelected(m_pressedIndex);
1004         } else if (m_pressedIndex == -1) {
1005             m_selectionManager->clearSelection();
1006             startRubberBand();
1007         }
1008
1009         Q_EMIT scrollerStop();
1010
1011         m_view->m_tapAndHoldIndicator->setStartPosition(m_pressedMousePos);
1012         m_view->m_tapAndHoldIndicator->setActive(true);
1013
1014         m_dragActionOrRightClick = true;
1015     }
1016 }
1017
1018 void KItemListController::pinchTriggered(QGestureEvent* event, const QTransform& transform)
1019 {
1020     Q_UNUSED(transform)
1021
1022     const QPinchGesture* pinch = static_cast<QPinchGesture*>(event->gesture(Qt::PinchGesture));
1023     const qreal sensitivityModifier = 0.2;
1024     static qreal counter = 0;
1025
1026     if (pinch->state() == Qt::GestureStarted) {
1027         m_pinchGestureInProgress = true;
1028         counter = 0;
1029     }
1030     if (pinch->state() == Qt::GestureUpdated) {
1031         //if a swipe gesture was recognized or in progress, we don't want a pinch gesture to change the zoom
1032         if (m_isSwipeGesture) {
1033             return;
1034         }
1035         counter = counter + (pinch->scaleFactor() - 1);
1036         if (counter >= sensitivityModifier) {
1037             Q_EMIT increaseZoom();
1038             counter = 0;
1039         } else if (counter <= -sensitivityModifier) {
1040             Q_EMIT decreaseZoom();
1041             counter = 0;
1042         }
1043     }
1044 }
1045
1046 void KItemListController::swipeTriggered(QGestureEvent* event, const QTransform& transform)
1047 {
1048     Q_UNUSED(transform)
1049
1050     const KTwoFingerSwipe* swipe = static_cast<KTwoFingerSwipe*>(event->gesture(m_swipeGesture));
1051
1052     if (!swipe) {
1053         return;
1054     }
1055     if (swipe->state() == Qt::GestureStarted) {
1056         m_isSwipeGesture = true;
1057     }
1058
1059     if (swipe->state() == Qt::GestureCanceled) {
1060         m_isSwipeGesture = false;
1061     }
1062
1063     if (swipe->state() == Qt::GestureFinished) {
1064         Q_EMIT scrollerStop();
1065
1066         if (swipe->swipeAngle() <= 20 || swipe->swipeAngle() >= 340) {
1067             Q_EMIT mouseButtonPressed(m_pressedIndex, Qt::BackButton);
1068         } else if (swipe->swipeAngle() <= 200 && swipe->swipeAngle() >= 160) {
1069             Q_EMIT mouseButtonPressed(m_pressedIndex, Qt::ForwardButton);
1070         } else if (swipe->swipeAngle() <= 110 && swipe->swipeAngle() >= 60) {
1071             Q_EMIT swipeUp();
1072         }
1073         m_isSwipeGesture = true;
1074     }
1075 }
1076
1077 void KItemListController::twoFingerTapTriggered(QGestureEvent* event, const QTransform& transform)
1078 {
1079     const KTwoFingerTap* twoTap = static_cast<KTwoFingerTap*>(event->gesture(m_twoFingerTapGesture));
1080
1081     if (!twoTap) {
1082         return;
1083     }
1084
1085     if (twoTap->state() == Qt::GestureStarted) {
1086         m_pressedMousePos = transform.map(twoTap->pos());
1087         m_pressedIndex = m_view->itemAt(m_pressedMousePos);
1088         if (m_pressedIndex >= 0) {
1089             onPress(twoTap->screenPos().toPoint(), twoTap->pos().toPoint(), Qt::ControlModifier, Qt::LeftButton);
1090             onRelease(transform.map(twoTap->pos()), Qt::ControlModifier, Qt::LeftButton, false);
1091         }
1092
1093     }
1094 }
1095
1096 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
1097 {
1098     if (!event) {
1099         return false;
1100     }
1101
1102     switch (event->type()) {
1103     case QEvent::KeyPress:
1104         return keyPressEvent(static_cast<QKeyEvent*>(event));
1105     case QEvent::InputMethod:
1106         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
1107     case QEvent::GraphicsSceneMousePress:
1108         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
1109     case QEvent::GraphicsSceneMouseMove:
1110         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
1111     case QEvent::GraphicsSceneMouseRelease:
1112         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
1113     case QEvent::GraphicsSceneMouseDoubleClick:
1114         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
1115     case QEvent::GraphicsSceneWheel:
1116          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
1117     case QEvent::GraphicsSceneDragEnter:
1118         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
1119     case QEvent::GraphicsSceneDragLeave:
1120         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
1121     case QEvent::GraphicsSceneDragMove:
1122         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
1123     case QEvent::GraphicsSceneDrop:
1124         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
1125     case QEvent::GraphicsSceneHoverEnter:
1126         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
1127     case QEvent::GraphicsSceneHoverMove:
1128         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
1129     case QEvent::GraphicsSceneHoverLeave:
1130         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
1131     case QEvent::GraphicsSceneResize:
1132         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
1133     case QEvent::Gesture:
1134         return gestureEvent(static_cast<QGestureEvent*>(event), transform);
1135     case QEvent::TouchBegin:
1136         return touchBeginEvent(static_cast<QTouchEvent*>(event), transform);
1137     default:
1138         break;
1139     }
1140
1141     return false;
1142 }
1143
1144 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
1145 {
1146     if (!m_view) {
1147         return;
1148     }
1149
1150     KItemListRubberBand* rubberBand = m_view->rubberBand();
1151     if (rubberBand->isActive()) {
1152         const qreal diff = current - previous;
1153         // TODO: Ideally just QCursor::pos() should be used as
1154         // new end-position but it seems there is no easy way
1155         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
1156         // (... or I just missed an easy way to do the mapping)
1157         QPointF endPos = rubberBand->endPosition();
1158         if (m_view->scrollOrientation() == Qt::Vertical) {
1159             endPos.ry() += diff;
1160         } else {
1161             endPos.rx() += diff;
1162         }
1163
1164         rubberBand->setEndPosition(endPos);
1165     }
1166 }
1167
1168 void KItemListController::slotRubberBandChanged()
1169 {
1170     if (!m_view || !m_model || m_model->count() <= 0) {
1171         return;
1172     }
1173
1174     const KItemListRubberBand* rubberBand = m_view->rubberBand();
1175     const QPointF startPos = rubberBand->startPosition();
1176     const QPointF endPos = rubberBand->endPosition();
1177     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
1178
1179     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
1180     if (scrollVertical) {
1181         rubberBandRect.translate(0, -m_view->scrollOffset());
1182     } else {
1183         rubberBandRect.translate(-m_view->scrollOffset(), 0);
1184     }
1185
1186     if (!m_oldSelection.isEmpty()) {
1187         // Clear the old selection that was available before the rubberband has
1188         // been activated in case if no Shift- or Control-key are pressed
1189         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
1190                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
1191         if (!shiftOrControlPressed) {
1192             m_oldSelection.clear();
1193         }
1194     }
1195
1196     KItemSet selectedItems;
1197
1198     // Select all visible items that intersect with the rubberband
1199     const auto widgets = m_view->visibleItemListWidgets();
1200     for (const KItemListWidget* widget : widgets) {
1201         const int index = widget->index();
1202
1203         const QRectF widgetRect = m_view->itemRect(index);
1204         if (widgetRect.intersects(rubberBandRect)) {
1205             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
1206             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
1207             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
1208                 selectedItems.insert(index);
1209             }
1210         }
1211     }
1212
1213     // Select all invisible items that intersect with the rubberband. Instead of
1214     // iterating all items only the area which might be touched by the rubberband
1215     // will be checked.
1216     const bool increaseIndex = scrollVertical ?
1217                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
1218
1219     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
1220     bool selectionFinished = false;
1221     do {
1222         const QRectF widgetRect = m_view->itemRect(index);
1223         if (widgetRect.intersects(rubberBandRect)) {
1224             selectedItems.insert(index);
1225         }
1226
1227         if (increaseIndex) {
1228             ++index;
1229             selectionFinished = (index >= m_model->count()) ||
1230                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
1231                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
1232         } else {
1233             --index;
1234             selectionFinished = (index < 0) ||
1235                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
1236                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
1237         }
1238     } while (!selectionFinished);
1239
1240     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1241         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1242         // Therefore, the new selection contains:
1243         // 1. All previously selected items which are not inside the rubberband, and
1244         // 2. all items inside the rubberband which have not been selected previously.
1245         m_selectionManager->setSelectedItems(m_oldSelection ^ selectedItems);
1246     }
1247     else {
1248         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1249     }
1250 }
1251
1252 void KItemListController::startDragging()
1253 {
1254     if (!m_view || !m_model) {
1255         return;
1256     }
1257
1258     const KItemSet selectedItems = m_selectionManager->selectedItems();
1259     if (selectedItems.isEmpty()) {
1260         return;
1261     }
1262
1263     QMimeData* data = m_model->createMimeData(selectedItems);
1264     if (!data) {
1265         return;
1266     }
1267
1268     // The created drag object will be owned and deleted
1269     // by QApplication::activeWindow().
1270     QDrag* drag = new QDrag(QApplication::activeWindow());
1271     drag->setMimeData(data);
1272
1273     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1274     drag->setPixmap(pixmap);
1275
1276     const QPoint hotSpot((pixmap.width() / pixmap.devicePixelRatio()) / 2, 0);
1277     drag->setHotSpot(hotSpot);
1278
1279     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1280
1281     QAccessibleEvent accessibilityEvent(view(), QAccessible::DragDropStart);
1282     QAccessible::updateAccessibility(&accessibilityEvent);
1283 }
1284
1285 KItemListWidget* KItemListController::hoveredWidget() const
1286 {
1287     Q_ASSERT(m_view);
1288
1289     const auto widgets = m_view->visibleItemListWidgets();
1290     for (KItemListWidget* widget : widgets) {
1291         if (widget->isHovered()) {
1292             return widget;
1293         }
1294     }
1295
1296     return nullptr;
1297 }
1298
1299 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1300 {
1301     Q_ASSERT(m_view);
1302
1303     const auto widgets = m_view->visibleItemListWidgets();
1304     for (KItemListWidget* widget : widgets) {
1305         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1306
1307         const bool hovered = widget->contains(mappedPos) &&
1308                              !widget->expansionToggleRect().contains(mappedPos);
1309         if (hovered) {
1310             return widget;
1311         }
1312     }
1313
1314     return nullptr;
1315 }
1316
1317 void KItemListController::updateKeyboardAnchor()
1318 {
1319     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1320                              m_keyboardAnchorIndex < m_model->count() &&
1321                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1322     if (!validAnchor) {
1323         const int index = m_selectionManager->currentItem();
1324         m_keyboardAnchorIndex = index;
1325         m_keyboardAnchorPos = keyboardAnchorPos(index);
1326     }
1327 }
1328
1329 int KItemListController::nextRowIndex(int index) const
1330 {
1331     if (m_keyboardAnchorIndex < 0) {
1332         return index;
1333     }
1334
1335     const int maxIndex = m_model->count() - 1;
1336     if (index == maxIndex) {
1337         return index;
1338     }
1339
1340     // Calculate the index of the last column inside the row of the current index
1341     int lastColumnIndex = index;
1342     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1343         ++lastColumnIndex;
1344         if (lastColumnIndex >= maxIndex) {
1345             return index;
1346         }
1347     }
1348
1349     // Based on the last column index go to the next row and calculate the nearest index
1350     // that is below the current index
1351     int nextRowIndex = lastColumnIndex + 1;
1352     int searchIndex = nextRowIndex;
1353     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1354     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1355         ++searchIndex;
1356         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1357         if (searchDiff < minDiff) {
1358             minDiff = searchDiff;
1359             nextRowIndex = searchIndex;
1360         }
1361     }
1362
1363     return nextRowIndex;
1364 }
1365
1366 int KItemListController::previousRowIndex(int index) const
1367 {
1368     if (m_keyboardAnchorIndex < 0 || index == 0) {
1369         return index;
1370     }
1371
1372     // Calculate the index of the first column inside the row of the current index
1373     int firstColumnIndex = index;
1374     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1375         --firstColumnIndex;
1376         if (firstColumnIndex <= 0) {
1377             return index;
1378         }
1379     }
1380
1381     // Based on the first column index go to the previous row and calculate the nearest index
1382     // that is above the current index
1383     int previousRowIndex = firstColumnIndex - 1;
1384     int searchIndex = previousRowIndex;
1385     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1386     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1387         --searchIndex;
1388         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1389         if (searchDiff < minDiff) {
1390             minDiff = searchDiff;
1391             previousRowIndex = searchIndex;
1392         }
1393     }
1394
1395     return previousRowIndex;
1396 }
1397
1398 qreal KItemListController::keyboardAnchorPos(int index) const
1399 {
1400     const QRectF itemRect = m_view->itemRect(index);
1401     if (!itemRect.isEmpty()) {
1402         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1403     }
1404
1405     return 0;
1406 }
1407
1408 void KItemListController::updateExtendedSelectionRegion()
1409 {
1410     if (m_view) {
1411         const bool extend = (m_selectionBehavior != MultiSelection);
1412         KItemListStyleOption option = m_view->styleOption();
1413         if (option.extendedSelectionRegion != extend) {
1414             option.extendedSelectionRegion = extend;
1415             m_view->setStyleOption(option);
1416         }
1417     }
1418 }
1419
1420 bool KItemListController::onPress(const QPoint& screenPos, const QPointF& pos, const Qt::KeyboardModifiers modifiers, const Qt::MouseButtons buttons)
1421 {
1422     Q_EMIT mouseButtonPressed(m_pressedIndex, buttons);
1423
1424     if (buttons & (Qt::BackButton | Qt::ForwardButton)) {
1425         // Do not select items when clicking the back/forward buttons, see
1426         // https://bugs.kde.org/show_bug.cgi?id=327412.
1427         return true;
1428     }
1429
1430     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
1431         m_selectionManager->endAnchoredSelection();
1432         m_selectionManager->setCurrentItem(m_pressedIndex);
1433         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
1434         return true;
1435     }
1436
1437     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
1438     if (m_selectionTogglePressed) {
1439         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
1440         // The previous anchored selection has been finished already in
1441         // KItemListSelectionManager::setSelected(). We can safely change
1442         // the current item and start a new anchored selection now.
1443         m_selectionManager->setCurrentItem(m_pressedIndex);
1444         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
1445         return true;
1446     }
1447
1448     const bool shiftPressed = modifiers & Qt::ShiftModifier;
1449     const bool controlPressed = modifiers & Qt::ControlModifier;
1450
1451     // The previous selection is cleared if either
1452     // 1. The selection mode is SingleSelection, or
1453     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
1454     //    a) Shift or Control are pressed.
1455     //    b) The clicked item is selected already. In that case, the user might want to:
1456     //       - start dragging multiple items, or
1457     //       - open the context menu and perform an action for all selected items.
1458     const bool shiftOrControlPressed = shiftPressed || controlPressed;
1459     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
1460     const bool clearSelection = m_selectionBehavior == SingleSelection ||
1461                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
1462     if (clearSelection) {
1463         m_selectionManager->clearSelection();
1464     } else if (pressedItemAlreadySelected && !shiftOrControlPressed && (buttons & Qt::LeftButton)) {
1465         // The user might want to start dragging multiple items, but if he clicks the item
1466         // in order to trigger it instead, the other selected items must be deselected.
1467         // However, we do not know yet what the user is going to do.
1468         // -> remember that the user pressed an item which had been selected already and
1469         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
1470         m_clearSelectionIfItemsAreNotDragged = true;
1471
1472         if (m_selectionManager->selectedItems().count() == 1 && m_view->isAboveText(m_pressedIndex, m_pressedMousePos)) {
1473             Q_EMIT selectedItemTextPressed(m_pressedIndex);
1474         }
1475     }
1476
1477     if (!shiftPressed) {
1478         // Finish the anchored selection before the current index is changed
1479         m_selectionManager->endAnchoredSelection();
1480     }
1481
1482     if (buttons & Qt::RightButton) {
1483         // Stop rubber band from persisting after right-clicks
1484         KItemListRubberBand* rubberBand = m_view->rubberBand();
1485         if (rubberBand->isActive()) {
1486             disconnect(rubberBand, &KItemListRubberBand::endPositionChanged, this, &KItemListController::slotRubberBandChanged);
1487             rubberBand->setActive(false);
1488             m_view->setAutoScroll(false);
1489         }
1490     }
1491
1492     if (m_pressedIndex >= 0) {
1493         m_selectionManager->setCurrentItem(m_pressedIndex);
1494
1495         switch (m_selectionBehavior) {
1496         case NoSelection:
1497             break;
1498
1499         case SingleSelection:
1500             m_selectionManager->setSelected(m_pressedIndex);
1501             break;
1502
1503         case MultiSelection:
1504             if (controlPressed && !shiftPressed) {
1505                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
1506                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
1507             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
1508                 // Select the pressed item and start a new anchored selection
1509                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
1510                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
1511             }
1512             break;
1513
1514         default:
1515             Q_ASSERT(false);
1516             break;
1517         }
1518
1519         if (buttons & Qt::RightButton) {
1520             Q_EMIT itemContextMenuRequested(m_pressedIndex, screenPos);
1521         }
1522
1523         return true;
1524     }
1525
1526     if (buttons & Qt::RightButton) {
1527         const QRectF headerBounds = m_view->headerBoundaries();
1528         if (headerBounds.contains(pos)) {
1529             Q_EMIT headerContextMenuRequested(screenPos);
1530         } else {
1531             Q_EMIT viewContextMenuRequested(screenPos);
1532         }
1533         return true;
1534     }
1535
1536     return false;
1537 }
1538
1539 bool KItemListController::onRelease(const QPointF& pos, const Qt::KeyboardModifiers modifiers, const Qt::MouseButtons buttons, bool touch)
1540 {
1541     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
1542     if (isAboveSelectionToggle) {
1543         m_selectionTogglePressed = false;
1544         return true;
1545     }
1546
1547     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
1548         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
1549         m_selectionTogglePressed = false;
1550         return true;
1551     }
1552
1553     const bool controlPressed = modifiers & Qt::ControlModifier;
1554     const bool shiftOrControlPressed = modifiers & Qt::ShiftModifier ||
1555                                        controlPressed;
1556
1557     KItemListRubberBand* rubberBand = m_view->rubberBand();
1558     if (rubberBand->isActive()) {
1559         disconnect(rubberBand, &KItemListRubberBand::endPositionChanged, this, &KItemListController::slotRubberBandChanged);
1560         rubberBand->setActive(false);
1561         m_oldSelection.clear();
1562         m_view->setAutoScroll(false);
1563     }
1564
1565     const int index = m_view->itemAt(pos);
1566
1567     if (index >= 0 && index == m_pressedIndex) {
1568         // The release event is done above the same item as the press event
1569
1570         if (m_clearSelectionIfItemsAreNotDragged) {
1571             // A selected item has been clicked, but no drag operation has been started
1572             // -> clear the rest of the selection.
1573             m_selectionManager->clearSelection();
1574             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
1575             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
1576         }
1577
1578         if (buttons & Qt::LeftButton) {
1579             bool emitItemActivated = true;
1580             if (m_view->isAboveExpansionToggle(index, pos)) {
1581                 const bool expanded = m_model->isExpanded(index);
1582                 m_model->setExpanded(index, !expanded);
1583
1584                 Q_EMIT itemExpansionToggleClicked(index);
1585                 emitItemActivated = false;
1586             } else if (shiftOrControlPressed && m_selectionBehavior != SingleSelection) {
1587                 // The mouse click should only update the selection, not trigger the item, except when
1588                 // we are in single selection mode
1589                 emitItemActivated = false;
1590             } else if (!(m_view->style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick) || m_singleClickActivationEnforced)) {
1591                 if (touch) {
1592                 emitItemActivated = true;
1593                 } else {
1594                 emitItemActivated = false;
1595                 }
1596             }
1597             if (emitItemActivated) {
1598                 Q_EMIT itemActivated(index);
1599             }
1600         } else if (buttons & Qt::MiddleButton) {
1601             Q_EMIT itemMiddleClicked(index);
1602         }
1603     }
1604
1605     m_pressedMousePos = QPointF();
1606     m_pressedIndex = -1;
1607     m_clearSelectionIfItemsAreNotDragged = false;
1608     return false;
1609 }
1610
1611 void KItemListController::startRubberBand()
1612 {
1613     if (m_selectionBehavior == MultiSelection) {
1614         QPointF startPos = m_pressedMousePos;
1615         if (m_view->scrollOrientation() == Qt::Vertical) {
1616             startPos.ry() += m_view->scrollOffset();
1617             if (m_view->itemSize().width() < 0) {
1618                 // Use a special rubberband for views that have only one column and
1619                 // expand the rubberband to use the whole width of the view.
1620                 startPos.setX(0);
1621             }
1622         } else {
1623             startPos.rx() += m_view->scrollOffset();
1624         }
1625
1626         m_oldSelection = m_selectionManager->selectedItems();
1627         KItemListRubberBand* rubberBand = m_view->rubberBand();
1628         rubberBand->setStartPosition(startPos);
1629         rubberBand->setEndPosition(startPos);
1630         rubberBand->setActive(true);
1631         connect(rubberBand, &KItemListRubberBand::endPositionChanged, this, &KItemListController::slotRubberBandChanged);
1632         m_view->setAutoScroll(true);
1633     }
1634 }
1635
1636 void KItemListController::slotStateChanged(QScroller::State newState)
1637 {
1638     if (newState == QScroller::Scrolling) {
1639         m_scrollerIsScrolling = true;
1640     } else if (newState == QScroller::Inactive) {
1641         m_scrollerIsScrolling = false;
1642     }
1643 }