src/kitemviews/kitemlistcontroller.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *   Copyright (C) 2012 by Frank Reininghaus <frank78ac@googlemail.com>    *
   4  *                                                                         *
   5  *   Based on the Itemviews NG project from Trolltech Labs:                *
   6  *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  22  ***************************************************************************/
  23
  24 #include "kitemlistcontroller.h"
  25
  26 #include <KGlobalSettings>
  27 #include <KDebug>
  28
  29 #include "kitemlistview.h"
  30 #include "kitemlistselectionmanager.h"
  31
  32 #include "private/kitemlistrubberband.h"
  33 #include "private/kitemlistkeyboardsearchmanager.h"
  34
  35 #include <QApplication>
  36 #include <QDrag>
  37 #include <QEvent>
  38 #include <QGraphicsScene>
  39 #include <QGraphicsSceneEvent>
  40 #include <QGraphicsView>
  41 #include <QMimeData>
  42 #include <QTimer>
  43
  44 KItemListController::KItemListController(KItemModelBase* model, KItemListView* view, QObject* parent) :
  45     QObject(parent),
  46     m_singleClickActivation(KGlobalSettings::singleClick()),
  47     m_selectionTogglePressed(false),
  48     m_clearSelectionIfItemsAreNotDragged(false),
  49     m_selectionBehavior(NoSelection),
  50     m_model(0),
  51     m_view(0),
  52     m_selectionManager(new KItemListSelectionManager(this)),
  53     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  54     m_pressedIndex(-1),
  55     m_pressedMousePos(),
  56     m_autoActivationTimer(0),
  57     m_oldSelection(),
  58     m_keyboardAnchorIndex(-1),
  59     m_keyboardAnchorPos(0)
  60 {
  61     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
  62             this, SLOT(slotChangeCurrentItem(QString,bool)));
  63     connect(m_selectionManager, SIGNAL(currentChanged(int,int)),
  64             m_keyboardManager, SLOT(slotCurrentChanged(int,int)));
  65
  66     m_autoActivationTimer = new QTimer(this);
  67     m_autoActivationTimer->setSingleShot(true);
  68     m_autoActivationTimer->setInterval(-1);
  69     connect(m_autoActivationTimer, SIGNAL(timeout()), this, SLOT(slotAutoActivationTimeout()));
  70
  71     setModel(model);
  72     setView(view);
  73 }
  74
  75 KItemListController::~KItemListController()
  76 {
  77     setView(0);
  78     Q_ASSERT(!m_view);
  79
  80     setModel(0);
  81     Q_ASSERT(!m_model);
  82 }
  83
  84 void KItemListController::setModel(KItemModelBase* model)
  85 {
  86     if (m_model == model) {
  87         return;
  88     }
  89
  90     KItemModelBase* oldModel = m_model;
  91     if (oldModel) {
  92         oldModel->deleteLater();
  93     }
  94
  95     m_model = model;
  96     if (m_model) {
  97         m_model->setParent(this);
  98     }
  99
 100     if (m_view) {
 101         m_view->setModel(m_model);
 102     }
 103
 104     m_selectionManager->setModel(m_model);
 105
 106     emit modelChanged(m_model, oldModel);
 107 }
 108
 109 KItemModelBase* KItemListController::model() const
 110 {
 111     return m_model;
 112 }
 113
 114 KItemListSelectionManager* KItemListController::selectionManager() const
 115 {
 116     return m_selectionManager;
 117 }
 118
 119 void KItemListController::setView(KItemListView* view)
 120 {
 121     if (m_view == view) {
 122         return;
 123     }
 124
 125     KItemListView* oldView = m_view;
 126     if (oldView) {
 127         disconnect(oldView, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 128         oldView->deleteLater();
 129     }
 130
 131     m_view = view;
 132
 133     if (m_view) {
 134         m_view->setParent(this);
 135         m_view->setController(this);
 136         m_view->setModel(m_model);
 137         connect(m_view, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 138         updateExtendedSelectionRegion();
 139     }
 140
 141     emit viewChanged(m_view, oldView);
 142 }
 143
 144 KItemListView* KItemListController::view() const
 145 {
 146     return m_view;
 147 }
 148
 149 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 150 {
 151     m_selectionBehavior = behavior;
 152     updateExtendedSelectionRegion();
 153 }
 154
 155 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 156 {
 157     return m_selectionBehavior;
 158 }
 159
 160 void KItemListController::setAutoActivationDelay(int delay)
 161 {
 162     m_autoActivationTimer->setInterval(delay);
 163 }
 164
 165 int KItemListController::autoActivationDelay() const
 166 {
 167     return m_autoActivationTimer->interval();
 168 }
 169
 170 void KItemListController::setSingleClickActivation(bool singleClick)
 171 {
 172     m_singleClickActivation = singleClick;
 173 }
 174
 175 bool KItemListController::singleClickActivation() const
 176 {
 177     return m_singleClickActivation;
 178 }
 179
 180 bool KItemListController::showEvent(QShowEvent* event)
 181 {
 182     Q_UNUSED(event);
 183     return false;
 184 }
 185
 186 bool KItemListController::hideEvent(QHideEvent* event)
 187 {
 188     Q_UNUSED(event);
 189     return false;
 190 }
 191
 192 bool KItemListController::keyPressEvent(QKeyEvent* event)
 193 {
 194     int index = m_selectionManager->currentItem();
 195     int key = event->key();
 196
 197     // Handle the expanding/collapsing of items
 198     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 199         if (key == Qt::Key_Right) {
 200             if (m_model->setExpanded(index, true)) {
 201                 return true;
 202             }
 203         } else if (key == Qt::Key_Left) {
 204             if (m_model->setExpanded(index, false)) {
 205                 return true;
 206             }
 207         }
 208     }
 209
 210     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 211     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 212     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 213
 214     const int itemCount = m_model->count();
 215
 216     // For horizontal scroll orientation, transform
 217     // the arrow keys to simplify the event handling.
 218     if (m_view->scrollOrientation() == Qt::Horizontal) {
 219         switch (key) {
 220         case Qt::Key_Up:    key = Qt::Key_Left; break;
 221         case Qt::Key_Down:  key = Qt::Key_Right; break;
 222         case Qt::Key_Left:  key = Qt::Key_Up; break;
 223         case Qt::Key_Right: key = Qt::Key_Down; break;
 224         default:            break;
 225         }
 226     }
 227
 228     const bool selectSingleItem = m_selectionBehavior != NoSelection &&
 229                                   itemCount == 1 &&
 230                                   (key == Qt::Key_Home || key == Qt::Key_End  ||
 231                                    key == Qt::Key_Up   || key == Qt::Key_Down ||
 232                                    key == Qt::Key_Left || key == Qt::Key_Right);
 233     if (selectSingleItem) {
 234         const int current = m_selectionManager->currentItem();
 235         m_selectionManager->setSelected(current);
 236         return true;
 237     }
 238
 239     switch (key) {
 240     case Qt::Key_Home:
 241         index = 0;
 242         m_keyboardAnchorIndex = index;
 243         m_keyboardAnchorPos = keyboardAnchorPos(index);
 244         break;
 245
 246     case Qt::Key_End:
 247         index = itemCount - 1;
 248         m_keyboardAnchorIndex = index;
 249         m_keyboardAnchorPos = keyboardAnchorPos(index);
 250         break;
 251
 252     case Qt::Key_Left:
 253         if (index > 0) {
 254             const int expandedParentsCount = m_model->expandedParentsCount(index);
 255             if (expandedParentsCount == 0) {
 256                 --index;
 257             } else {
 258                 // Go to the parent of the current item.
 259                 do {
 260                     --index;
 261                 } while (index > 0 && m_model->expandedParentsCount(index) == expandedParentsCount);
 262             }
 263             m_keyboardAnchorIndex = index;
 264             m_keyboardAnchorPos = keyboardAnchorPos(index);
 265         }
 266         break;
 267
 268     case Qt::Key_Right:
 269         if (index < itemCount - 1) {
 270             ++index;
 271             m_keyboardAnchorIndex = index;
 272             m_keyboardAnchorPos = keyboardAnchorPos(index);
 273         }
 274         break;
 275
 276     case Qt::Key_Up:
 277         updateKeyboardAnchor();
 278         index = previousRowIndex(index);
 279         break;
 280
 281     case Qt::Key_Down:
 282         updateKeyboardAnchor();
 283         index = nextRowIndex(index);
 284         break;
 285
 286     case Qt::Key_PageUp:
 287         if (m_view->scrollOrientation() == Qt::Horizontal) {
 288             // The new current index should correspond to the first item in the current column.
 289             int newIndex = qMax(index - 1, 0);
 290             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() < m_view->itemRect(index).topLeft().y()) {
 291                 index = newIndex;
 292                 newIndex = qMax(index - 1, 0);
 293             }
 294             m_keyboardAnchorIndex = index;
 295             m_keyboardAnchorPos = keyboardAnchorPos(index);
 296         } else {
 297             const qreal currentItemBottom = m_view->itemRect(index).bottomLeft().y();
 298             const qreal height = m_view->geometry().height();
 299
 300             // The new current item should be the first item in the current
 301             // column whose itemRect's top coordinate is larger than targetY.
 302             const qreal targetY = currentItemBottom - height;
 303
 304             updateKeyboardAnchor();
 305             int newIndex = previousRowIndex(index);
 306             do {
 307                 index = newIndex;
 308                 updateKeyboardAnchor();
 309                 newIndex = previousRowIndex(index);
 310             } while (m_view->itemRect(newIndex).topLeft().y() > targetY && newIndex != index);
 311         }
 312         break;
 313
 314     case Qt::Key_PageDown:
 315         if (m_view->scrollOrientation() == Qt::Horizontal) {
 316             // The new current index should correspond to the last item in the current column.
 317             int newIndex = qMin(index + 1, m_model->count() - 1);
 318             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() > m_view->itemRect(index).topLeft().y()) {
 319                 index = newIndex;
 320                 newIndex = qMin(index + 1, m_model->count() - 1);
 321             }
 322             m_keyboardAnchorIndex = index;
 323             m_keyboardAnchorPos = keyboardAnchorPos(index);
 324         } else {
 325             const qreal currentItemTop = m_view->itemRect(index).topLeft().y();
 326             const qreal height = m_view->geometry().height();
 327
 328             // The new current item should be the last item in the current
 329             // column whose itemRect's bottom coordinate is smaller than targetY.
 330             const qreal targetY = currentItemTop + height;
 331
 332             updateKeyboardAnchor();
 333             int newIndex = nextRowIndex(index);
 334             do {
 335                 index = newIndex;
 336                 updateKeyboardAnchor();
 337                 newIndex = nextRowIndex(index);
 338             } while (m_view->itemRect(newIndex).bottomLeft().y() < targetY && newIndex != index);
 339         }
 340         break;
 341
 342     case Qt::Key_Enter:
 343     case Qt::Key_Return: {
 344         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 345         if (selectedItems.count() >= 2) {
 346             emit itemsActivated(selectedItems);
 347         } else if (selectedItems.count() == 1) {
 348             emit itemActivated(selectedItems.toList().first());
 349         } else {
 350             emit itemActivated(index);
 351         }
 352         break;
 353     }
 354
 355     case Qt::Key_Space:
 356         if (m_selectionBehavior == MultiSelection) {
 357             if (controlPressed) {
 358                 m_selectionManager->endAnchoredSelection();
 359                 m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 360                 m_selectionManager->beginAnchoredSelection(index);
 361             } else {
 362                 const int current = m_selectionManager->currentItem();
 363                 m_selectionManager->setSelected(current);
 364             }
 365         }
 366         break;
 367
 368     case Qt::Key_Menu: {
 369         // Emit the signal itemContextMenuRequested() in case if at least one
 370         // item is selected. Otherwise the signal viewContextMenuRequested() will be emitted.
 371         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 372         int index = -1;
 373         if (selectedItems.count() >= 2) {
 374             const int currentItemIndex = m_selectionManager->currentItem();
 375             index = selectedItems.contains(currentItemIndex)
 376                     ? currentItemIndex : selectedItems.toList().first();
 377         } else if (selectedItems.count() == 1) {
 378             index = selectedItems.toList().first();
 379         }
 380
 381         if (index >= 0) {
 382             const QRectF contextRect = m_view->itemContextRect(index);
 383             const QPointF pos(m_view->scene()->views().first()->mapToGlobal(contextRect.bottomRight().toPoint()));
 384             emit itemContextMenuRequested(index, pos);
 385         } else {
 386             emit viewContextMenuRequested(QCursor::pos());
 387         }
 388         break;
 389     }
 390
 391     case Qt::Key_Escape:
 392         if (m_selectionBehavior != SingleSelection) {
 393             m_selectionManager->clearSelection();
 394         }
 395         m_keyboardManager->cancelSearch();
 396         break;
 397
 398     default:
 399         m_keyboardManager->addKeys(event->text());
 400         return false;
 401     }
 402
 403     if (m_selectionManager->currentItem() != index) {
 404         switch (m_selectionBehavior) {
 405         case NoSelection:
 406             m_selectionManager->setCurrentItem(index);
 407             break;
 408
 409         case SingleSelection:
 410             m_selectionManager->setCurrentItem(index);
 411             m_selectionManager->clearSelection();
 412             m_selectionManager->setSelected(index, 1);
 413             break;
 414
 415         case MultiSelection:
 416             if (controlPressed) {
 417                 m_selectionManager->endAnchoredSelection();
 418             }
 419
 420             m_selectionManager->setCurrentItem(index);
 421
 422             if (!shiftOrControlPressed) {
 423                 m_selectionManager->clearSelection();
 424                 m_selectionManager->setSelected(index, 1);
 425             }
 426
 427             if (!shiftPressed) {
 428                 m_selectionManager->beginAnchoredSelection(index);
 429             }
 430             break;
 431         }
 432
 433         m_view->scrollToItem(index);
 434     }
 435     return true;
 436 }
 437
 438 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 439 {
 440     if (!m_model || m_model->count() == 0) {
 441         return;
 442     }
 443     const int currentIndex = m_selectionManager->currentItem();
 444     int index;
 445     if (searchFromNextItem) {
 446         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 447     } else {
 448         index = m_model->indexForKeyboardSearch(text, currentIndex);
 449     }
 450     if (index >= 0) {
 451         m_selectionManager->setCurrentItem(index);
 452         m_selectionManager->clearSelection();
 453         m_selectionManager->setSelected(index, 1);
 454         m_selectionManager->beginAnchoredSelection(index);
 455         m_view->scrollToItem(index);
 456     }
 457 }
 458
 459 void KItemListController::slotAutoActivationTimeout()
 460 {
 461     if (!m_model || !m_view) {
 462         return;
 463     }
 464
 465     const int index = m_autoActivationTimer->property("index").toInt();
 466     if (index < 0 || index >= m_model->count()) {
 467         return;
 468     }
 469
 470     if (m_model->supportsDropping(index)) {
 471         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 472             const bool expanded = m_model->isExpanded(index);
 473             m_model->setExpanded(index, !expanded);
 474         } else {
 475             emit itemActivated(index);
 476         }
 477     }
 478 }
 479
 480 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 481 {
 482     Q_UNUSED(event);
 483     return false;
 484 }
 485
 486 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 487 {
 488     if (!m_view) {
 489         return false;
 490     }
 491
 492     m_pressedMousePos = transform.map(event->pos());
 493     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 494     emit mouseButtonPressed(m_pressedIndex, event->buttons());
 495
 496     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 497         m_selectionManager->endAnchoredSelection();
 498         m_selectionManager->setCurrentItem(m_pressedIndex);
 499         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 500         return true;
 501     }
 502
 503     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 504     if (m_selectionTogglePressed) {
 505         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 506         // The previous anchored selection has been finished already in
 507         // KItemListSelectionManager::setSelected(). We can safely change
 508         // the current item and start a new anchored selection now.
 509         m_selectionManager->setCurrentItem(m_pressedIndex);
 510         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 511         return true;
 512     }
 513
 514     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 515     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 516
 517     // The previous selection is cleared if either
 518     // 1. The selection mode is SingleSelection, or
 519     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 520     //    a) Shift or Control are pressed.
 521     //    b) The clicked item is selected already. In that case, the user might want to:
 522     //       - start dragging multiple items, or
 523     //       - open the context menu and perform an action for all selected items.
 524     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 525     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 526     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 527                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 528     if (clearSelection) {
 529         m_selectionManager->clearSelection();
 530     } else if (pressedItemAlreadySelected && !shiftOrControlPressed && (event->buttons() & Qt::LeftButton)) {
 531         // The user might want to start dragging multiple items, but if he clicks the item
 532         // in order to trigger it instead, the other selected items must be deselected.
 533         // However, we do not know yet what the user is going to do.
 534         // -> remember that the user pressed an item which had been selected already and
 535         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
 536         m_clearSelectionIfItemsAreNotDragged = true;
 537     }
 538
 539     if (!shiftPressed) {
 540         // Finish the anchored selection before the current index is changed
 541         m_selectionManager->endAnchoredSelection();
 542     }
 543
 544     if (m_pressedIndex >= 0) {
 545         m_selectionManager->setCurrentItem(m_pressedIndex);
 546
 547         switch (m_selectionBehavior) {
 548         case NoSelection:
 549             break;
 550
 551         case SingleSelection:
 552             m_selectionManager->setSelected(m_pressedIndex);
 553             break;
 554
 555         case MultiSelection:
 556             if (controlPressed && !shiftPressed) {
 557                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 558                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 559             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 560                 // Select the pressed item and start a new anchored selection
 561                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 562                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 563             }
 564             break;
 565
 566         default:
 567             Q_ASSERT(false);
 568             break;
 569         }
 570
 571         if (event->buttons() & Qt::RightButton) {
 572             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 573         }
 574
 575         return true;
 576     }
 577
 578     if (event->buttons() & Qt::RightButton) {
 579         const QRectF headerBounds = m_view->headerBoundaries();
 580         if (headerBounds.contains(event->pos())) {
 581             emit headerContextMenuRequested(event->screenPos());
 582         } else {
 583             emit viewContextMenuRequested(event->screenPos());
 584         }
 585         return true;
 586     }
 587
 588     if (m_selectionBehavior == MultiSelection) {
 589         QPointF startPos = m_pressedMousePos;
 590         if (m_view->scrollOrientation() == Qt::Vertical) {
 591             startPos.ry() += m_view->scrollOffset();
 592             if (m_view->itemSize().width() < 0) {
 593                 // Use a special rubberband for views that have only one column and
 594                 // expand the rubberband to use the whole width of the view.
 595                 startPos.setX(0);
 596             }
 597         } else {
 598             startPos.rx() += m_view->scrollOffset();
 599         }
 600
 601         m_oldSelection = m_selectionManager->selectedItems();
 602         KItemListRubberBand* rubberBand = m_view->rubberBand();
 603         rubberBand->setStartPosition(startPos);
 604         rubberBand->setEndPosition(startPos);
 605         rubberBand->setActive(true);
 606         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 607         m_view->setAutoScroll(true);
 608     }
 609
 610     return false;
 611 }
 612
 613 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 614 {
 615     if (!m_view) {
 616         return false;
 617     }
 618
 619     if (m_pressedIndex >= 0) {
 620         // Check whether a dragging should be started
 621         if (event->buttons() & Qt::LeftButton) {
 622             const QPointF pos = transform.map(event->pos());
 623             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 624                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 625                     // Always assure that the dragged item gets selected. Usually this is already
 626                     // done on the mouse-press event, but when using the selection-toggle on a
 627                     // selected item the dragged item is not selected yet.
 628                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 629                 } else {
 630                     // A selected item has been clicked to drag all selected items
 631                     // -> the selection should not be cleared when the mouse button is released.
 632                     m_clearSelectionIfItemsAreNotDragged = false;
 633                 }
 634
 635                 startDragging();
 636             }
 637         }
 638     } else {
 639         KItemListRubberBand* rubberBand = m_view->rubberBand();
 640         if (rubberBand->isActive()) {
 641             QPointF endPos = transform.map(event->pos());
 642
 643             // Update the current item.
 644             const int newCurrent = m_view->itemAt(endPos);
 645             if (newCurrent >= 0) {
 646                 // It's expected that the new current index is also the new anchor (bug 163451).
 647                 m_selectionManager->endAnchoredSelection();
 648                 m_selectionManager->setCurrentItem(newCurrent);
 649                 m_selectionManager->beginAnchoredSelection(newCurrent);
 650             }
 651
 652             if (m_view->scrollOrientation() == Qt::Vertical) {
 653                 endPos.ry() += m_view->scrollOffset();
 654                 if (m_view->itemSize().width() < 0) {
 655                     // Use a special rubberband for views that have only one column and
 656                     // expand the rubberband to use the whole width of the view.
 657                     endPos.setX(m_view->size().width());
 658                 }
 659             } else {
 660                 endPos.rx() += m_view->scrollOffset();
 661             }
 662             rubberBand->setEndPosition(endPos);
 663         }
 664     }
 665
 666     return false;
 667 }
 668
 669 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 670 {
 671     if (!m_view) {
 672         return false;
 673     }
 674
 675     emit mouseButtonReleased(m_pressedIndex, event->buttons());
 676
 677     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 678     if (isAboveSelectionToggle) {
 679         m_selectionTogglePressed = false;
 680         return true;
 681     }
 682
 683     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 684         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 685         m_selectionTogglePressed = false;
 686         return true;
 687     }
 688
 689     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 690                                        event->modifiers() & Qt::ControlModifier;
 691
 692     KItemListRubberBand* rubberBand = m_view->rubberBand();
 693     if (rubberBand->isActive()) {
 694         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 695         rubberBand->setActive(false);
 696         m_oldSelection.clear();
 697         m_view->setAutoScroll(false);
 698     }
 699
 700     const QPointF pos = transform.map(event->pos());
 701     const int index = m_view->itemAt(pos);
 702
 703     if (index >= 0 && index == m_pressedIndex) {
 704         // The release event is done above the same item as the press event
 705
 706         if (m_clearSelectionIfItemsAreNotDragged) {
 707             // A selected item has been clicked, but no drag operation has been started
 708             // -> clear the rest of the selection.
 709             m_selectionManager->clearSelection();
 710             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 711             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 712         }
 713
 714         if (event->button() & Qt::LeftButton) {
 715             bool emitItemActivated = true;
 716             if (m_view->isAboveExpansionToggle(index, pos)) {
 717                 const bool expanded = m_model->isExpanded(index);
 718                 m_model->setExpanded(index, !expanded);
 719
 720                 emit itemExpansionToggleClicked(index);
 721                 emitItemActivated = false;
 722             } else if (shiftOrControlPressed) {
 723                 // The mouse click should only update the selection, not trigger the item
 724                 emitItemActivated = false;
 725             } else if (!m_singleClickActivation) {
 726                 emitItemActivated = false;
 727             }
 728             if (emitItemActivated) {
 729                 emit itemActivated(index);
 730             }
 731         } else if (event->button() & Qt::MidButton) {
 732             emit itemMiddleClicked(index);
 733         }
 734     }
 735
 736     m_pressedMousePos = QPointF();
 737     m_pressedIndex = -1;
 738     m_clearSelectionIfItemsAreNotDragged = false;
 739     return false;
 740 }
 741
 742 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 743 {
 744     const QPointF pos = transform.map(event->pos());
 745     const int index = m_view->itemAt(pos);
 746
 747     bool emitItemActivated = !m_singleClickActivation &&
 748                              (event->button() & Qt::LeftButton) &&
 749                              index >= 0 && index < m_model->count();
 750     if (emitItemActivated) {
 751         emit itemActivated(index);
 752     }
 753     return false;
 754 }
 755
 756 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 757 {
 758     Q_UNUSED(event);
 759     Q_UNUSED(transform);
 760     return false;
 761 }
 762
 763 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 764 {
 765     Q_UNUSED(event);
 766     Q_UNUSED(transform);
 767
 768     m_view->setAutoScroll(false);
 769     m_view->hideDropIndicator();
 770
 771     KItemListWidget* widget = hoveredWidget();
 772     if (widget) {
 773         widget->setHovered(false);
 774         emit itemUnhovered(widget->index());
 775     }
 776     return false;
 777 }
 778
 779 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 780 {
 781     Q_UNUSED(transform);
 782     if (!m_model || !m_view) {
 783         return false;
 784     }
 785
 786     event->acceptProposedAction();
 787
 788     KItemListWidget* oldHoveredWidget = hoveredWidget();
 789
 790     const QPointF pos = transform.map(event->pos());
 791     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 792
 793     if (oldHoveredWidget != newHoveredWidget) {
 794         m_autoActivationTimer->stop();
 795
 796         if (oldHoveredWidget) {
 797             oldHoveredWidget->setHovered(false);
 798             emit itemUnhovered(oldHoveredWidget->index());
 799         }
 800
 801         if (newHoveredWidget) {
 802             const int index = newHoveredWidget->index();
 803             if (m_model->supportsDropping(index)) {
 804                 newHoveredWidget->setHovered(true);
 805             } else if (m_model->sortRole().isEmpty()) {
 806                 // The model supports inserting of items on
 807                 // the given index. Assure that a drop-indicator
 808                 // is shown by the view.
 809                 m_view->showDropIndicator(pos);
 810             }
 811             emit itemHovered(index);
 812
 813             if (m_autoActivationTimer->interval() >= 0) {
 814                 m_autoActivationTimer->setProperty("index", index);
 815                 m_autoActivationTimer->start();
 816             }
 817         }
 818     }
 819
 820     return false;
 821 }
 822
 823 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 824 {
 825     Q_UNUSED(transform)
 826     if (!m_view) {
 827         return false;
 828     }
 829
 830     m_autoActivationTimer->stop();
 831     m_view->setAutoScroll(false);
 832
 833     const QPointF pos = transform.map(event->pos());
 834     if (m_model->sortRole().isEmpty()) {
 835         // The model supports inserting of items on
 836         // a given index.
 837         const int dropIndex = m_view->showDropIndicator(pos);
 838         m_view->hideDropIndicator();
 839         emit itemDropEvent(dropIndex, event);
 840     } else {
 841         emit itemDropEvent(m_view->itemAt(pos), event);
 842     }
 843
 844     return true;
 845 }
 846
 847 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 848 {
 849     Q_UNUSED(event);
 850     Q_UNUSED(transform);
 851     return false;
 852 }
 853
 854 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 855 {
 856     Q_UNUSED(transform);
 857     if (!m_model || !m_view) {
 858         return false;
 859     }
 860
 861     KItemListWidget* oldHoveredWidget = hoveredWidget();
 862     const QPointF pos = transform.map(event->pos());
 863     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 864
 865     if (oldHoveredWidget != newHoveredWidget) {
 866         if (oldHoveredWidget) {
 867             oldHoveredWidget->setHovered(false);
 868             emit itemUnhovered(oldHoveredWidget->index());
 869         }
 870
 871         if (newHoveredWidget) {
 872             newHoveredWidget->setHovered(true);
 873             emit itemHovered(newHoveredWidget->index());
 874         }
 875     }
 876
 877     return false;
 878 }
 879
 880 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 881 {
 882     Q_UNUSED(event);
 883     Q_UNUSED(transform);
 884
 885     if (!m_model || !m_view) {
 886         return false;
 887     }
 888
 889     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 890         if (widget->isHovered()) {
 891             widget->setHovered(false);
 892             emit itemUnhovered(widget->index());
 893         }
 894     }
 895     return false;
 896 }
 897
 898 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 899 {
 900     Q_UNUSED(event);
 901     Q_UNUSED(transform);
 902     return false;
 903 }
 904
 905 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 906 {
 907     Q_UNUSED(event);
 908     Q_UNUSED(transform);
 909     return false;
 910 }
 911
 912 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 913 {
 914     if (!event) {
 915         return false;
 916     }
 917
 918     switch (event->type()) {
 919     case QEvent::KeyPress:
 920         return keyPressEvent(static_cast<QKeyEvent*>(event));
 921     case QEvent::InputMethod:
 922         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 923     case QEvent::GraphicsSceneMousePress:
 924         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 925     case QEvent::GraphicsSceneMouseMove:
 926         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 927     case QEvent::GraphicsSceneMouseRelease:
 928         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 929     case QEvent::GraphicsSceneMouseDoubleClick:
 930         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 931     case QEvent::GraphicsSceneWheel:
 932          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 933     case QEvent::GraphicsSceneDragEnter:
 934         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 935     case QEvent::GraphicsSceneDragLeave:
 936         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 937     case QEvent::GraphicsSceneDragMove:
 938         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 939     case QEvent::GraphicsSceneDrop:
 940         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 941     case QEvent::GraphicsSceneHoverEnter:
 942         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 943     case QEvent::GraphicsSceneHoverMove:
 944         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 945     case QEvent::GraphicsSceneHoverLeave:
 946         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 947     case QEvent::GraphicsSceneResize:
 948         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 949     default:
 950         break;
 951     }
 952
 953     return false;
 954 }
 955
 956 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 957 {
 958     if (!m_view) {
 959         return;
 960     }
 961
 962     KItemListRubberBand* rubberBand = m_view->rubberBand();
 963     if (rubberBand->isActive()) {
 964         const qreal diff = current - previous;
 965         // TODO: Ideally just QCursor::pos() should be used as
 966         // new end-position but it seems there is no easy way
 967         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 968         // (... or I just missed an easy way to do the mapping)
 969         QPointF endPos = rubberBand->endPosition();
 970         if (m_view->scrollOrientation() == Qt::Vertical) {
 971             endPos.ry() += diff;
 972         } else {
 973             endPos.rx() += diff;
 974         }
 975
 976         rubberBand->setEndPosition(endPos);
 977     }
 978 }
 979
 980 void KItemListController::slotRubberBandChanged()
 981 {
 982     if (!m_view || !m_model || m_model->count() <= 0) {
 983         return;
 984     }
 985
 986     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 987     const QPointF startPos = rubberBand->startPosition();
 988     const QPointF endPos = rubberBand->endPosition();
 989     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 990
 991     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 992     if (scrollVertical) {
 993         rubberBandRect.translate(0, -m_view->scrollOffset());
 994     } else {
 995         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 996     }
 997
 998     if (!m_oldSelection.isEmpty()) {
 999         // Clear the old selection that was available before the rubberband has
1000         // been activated in case if no Shift- or Control-key are pressed
1001         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
1002                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
1003         if (!shiftOrControlPressed) {
1004             m_oldSelection.clear();
1005         }
1006     }
1007
1008     QSet<int> selectedItems;
1009
1010     // Select all visible items that intersect with the rubberband
1011     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1012         const int index = widget->index();
1013
1014         const QRectF widgetRect = m_view->itemRect(index);
1015         if (widgetRect.intersects(rubberBandRect)) {
1016             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
1017             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
1018             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
1019                 selectedItems.insert(index);
1020             }
1021         }
1022     }
1023
1024     // Select all invisible items that intersect with the rubberband. Instead of
1025     // iterating all items only the area which might be touched by the rubberband
1026     // will be checked.
1027     const bool increaseIndex = scrollVertical ?
1028                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
1029
1030     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
1031     bool selectionFinished = false;
1032     do {
1033         const QRectF widgetRect = m_view->itemRect(index);
1034         if (widgetRect.intersects(rubberBandRect)) {
1035             selectedItems.insert(index);
1036         }
1037
1038         if (increaseIndex) {
1039             ++index;
1040             selectionFinished = (index >= m_model->count()) ||
1041                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
1042                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
1043         } else {
1044             --index;
1045             selectionFinished = (index < 0) ||
1046                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
1047                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
1048         }
1049     } while (!selectionFinished);
1050
1051     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1052         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1053         // Therefore, the new selection contains:
1054         // 1. All previously selected items which are not inside the rubberband, and
1055         // 2. all items inside the rubberband which have not been selected previously.
1056         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
1057     }
1058     else {
1059         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1060     }
1061 }
1062
1063 void KItemListController::startDragging()
1064 {
1065     if (!m_view || !m_model) {
1066         return;
1067     }
1068
1069     const QSet<int> selectedItems = m_selectionManager->selectedItems();
1070     if (selectedItems.isEmpty()) {
1071         return;
1072     }
1073
1074     QMimeData* data = m_model->createMimeData(selectedItems);
1075     if (!data) {
1076         return;
1077     }
1078
1079     // The created drag object will be owned and deleted
1080     // by QApplication::activeWindow().
1081     QDrag* drag = new QDrag(QApplication::activeWindow());
1082     drag->setMimeData(data);
1083
1084     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1085     drag->setPixmap(pixmap);
1086
1087     const QPoint hotSpot(pixmap.width() / 2, 0);
1088     drag->setHotSpot(hotSpot);
1089
1090     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1091 }
1092
1093 KItemListWidget* KItemListController::hoveredWidget() const
1094 {
1095     Q_ASSERT(m_view);
1096
1097     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1098         if (widget->isHovered()) {
1099             return widget;
1100         }
1101     }
1102
1103     return 0;
1104 }
1105
1106 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1107 {
1108     Q_ASSERT(m_view);
1109
1110     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1111         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1112
1113         const bool hovered = widget->contains(mappedPos) &&
1114                              !widget->expansionToggleRect().contains(mappedPos);
1115         if (hovered) {
1116             return widget;
1117         }
1118     }
1119
1120     return 0;
1121 }
1122
1123 void KItemListController::updateKeyboardAnchor()
1124 {
1125     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1126                              m_keyboardAnchorIndex < m_model->count() &&
1127                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1128     if (!validAnchor) {
1129         const int index = m_selectionManager->currentItem();
1130         m_keyboardAnchorIndex = index;
1131         m_keyboardAnchorPos = keyboardAnchorPos(index);
1132     }
1133 }
1134
1135 int KItemListController::nextRowIndex(int index) const
1136 {
1137     if (m_keyboardAnchorIndex < 0) {
1138         return index;
1139     }
1140
1141     const int maxIndex = m_model->count() - 1;
1142     if (index == maxIndex) {
1143         return index;
1144     }
1145
1146     // Calculate the index of the last column inside the row of the current index
1147     int lastColumnIndex = index;
1148     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1149         ++lastColumnIndex;
1150         if (lastColumnIndex >= maxIndex) {
1151             return index;
1152         }
1153     }
1154
1155     // Based on the last column index go to the next row and calculate the nearest index
1156     // that is below the current index
1157     int nextRowIndex = lastColumnIndex + 1;
1158     int searchIndex = nextRowIndex;
1159     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1160     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1161         ++searchIndex;
1162         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1163         if (searchDiff < minDiff) {
1164             minDiff = searchDiff;
1165             nextRowIndex = searchIndex;
1166         }
1167     }
1168
1169     return nextRowIndex;
1170 }
1171
1172 int KItemListController::previousRowIndex(int index) const
1173 {
1174     if (m_keyboardAnchorIndex < 0 || index == 0) {
1175         return index;
1176     }
1177
1178     // Calculate the index of the first column inside the row of the current index
1179     int firstColumnIndex = index;
1180     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1181         --firstColumnIndex;
1182         if (firstColumnIndex <= 0) {
1183             return index;
1184         }
1185     }
1186
1187     // Based on the first column index go to the previous row and calculate the nearest index
1188     // that is above the current index
1189     int previousRowIndex = firstColumnIndex - 1;
1190     int searchIndex = previousRowIndex;
1191     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1192     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1193         --searchIndex;
1194         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1195         if (searchDiff < minDiff) {
1196             minDiff = searchDiff;
1197             previousRowIndex = searchIndex;
1198         }
1199     }
1200
1201     return previousRowIndex;
1202 }
1203
1204 qreal KItemListController::keyboardAnchorPos(int index) const
1205 {
1206     const QRectF itemRect = m_view->itemRect(index);
1207     if (!itemRect.isEmpty()) {
1208         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1209     }
1210
1211     return 0;
1212 }
1213
1214 void KItemListController::updateExtendedSelectionRegion()
1215 {
1216     if (m_view) {
1217         const bool extend = (m_selectionBehavior != MultiSelection);
1218         KItemListStyleOption option = m_view->styleOption();
1219         if (option.extendedSelectionRegion != extend) {
1220             option.extendedSelectionRegion = extend;
1221             m_view->setStyleOption(option);
1222         }
1223     }
1224 }
1225
1226 #include "kitemlistcontroller.moc"