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             --index;
 255             m_keyboardAnchorIndex = index;
 256             m_keyboardAnchorPos = keyboardAnchorPos(index);
 257         }
 258         break;
 259
 260     case Qt::Key_Right:
 261         if (index < itemCount - 1) {
 262             ++index;
 263             m_keyboardAnchorIndex = index;
 264             m_keyboardAnchorPos = keyboardAnchorPos(index);
 265         }
 266         break;
 267
 268     case Qt::Key_Up:
 269         updateKeyboardAnchor();
 270         index = previousRowIndex(index);
 271         break;
 272
 273     case Qt::Key_Down:
 274         updateKeyboardAnchor();
 275         index = nextRowIndex(index);
 276         break;
 277
 278     case Qt::Key_PageUp:
 279         if (m_view->scrollOrientation() == Qt::Horizontal) {
 280             // The new current index should correspond to the first item in the current column.
 281             int newIndex = qMax(index - 1, 0);
 282             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() < m_view->itemRect(index).topLeft().y()) {
 283                 index = newIndex;
 284                 newIndex = qMax(index - 1, 0);
 285             }
 286             m_keyboardAnchorIndex = index;
 287             m_keyboardAnchorPos = keyboardAnchorPos(index);
 288         } else {
 289             const qreal currentItemBottom = m_view->itemRect(index).bottomLeft().y();
 290             const qreal height = m_view->geometry().height();
 291
 292             // The new current item should be the first item in the current
 293             // column whose itemRect's top coordinate is larger than targetY.
 294             const qreal targetY = currentItemBottom - height;
 295
 296             updateKeyboardAnchor();
 297             int newIndex = previousRowIndex(index);
 298             do {
 299                 index = newIndex;
 300                 updateKeyboardAnchor();
 301                 newIndex = previousRowIndex(index);
 302             } while (m_view->itemRect(newIndex).topLeft().y() > targetY && newIndex != index);
 303         }
 304         break;
 305
 306     case Qt::Key_PageDown:
 307         if (m_view->scrollOrientation() == Qt::Horizontal) {
 308             // The new current index should correspond to the last item in the current column.
 309             int newIndex = qMin(index + 1, m_model->count() - 1);
 310             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() > m_view->itemRect(index).topLeft().y()) {
 311                 index = newIndex;
 312                 newIndex = qMin(index + 1, m_model->count() - 1);
 313             }
 314             m_keyboardAnchorIndex = index;
 315             m_keyboardAnchorPos = keyboardAnchorPos(index);
 316         } else {
 317             const qreal currentItemTop = m_view->itemRect(index).topLeft().y();
 318             const qreal height = m_view->geometry().height();
 319
 320             // The new current item should be the last item in the current
 321             // column whose itemRect's bottom coordinate is smaller than targetY.
 322             const qreal targetY = currentItemTop + height;
 323
 324             updateKeyboardAnchor();
 325             int newIndex = nextRowIndex(index);
 326             do {
 327                 index = newIndex;
 328                 updateKeyboardAnchor();
 329                 newIndex = nextRowIndex(index);
 330             } while (m_view->itemRect(newIndex).bottomLeft().y() < targetY && newIndex != index);
 331         }
 332         break;
 333
 334     case Qt::Key_Enter:
 335     case Qt::Key_Return: {
 336         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 337         if (selectedItems.count() >= 2) {
 338             emit itemsActivated(selectedItems);
 339         } else if (selectedItems.count() == 1) {
 340             emit itemActivated(selectedItems.toList().first());
 341         } else {
 342             emit itemActivated(index);
 343         }
 344         break;
 345     }
 346
 347     case Qt::Key_Space:
 348         if (m_selectionBehavior == MultiSelection) {
 349             if (controlPressed) {
 350                 m_selectionManager->endAnchoredSelection();
 351                 m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 352                 m_selectionManager->beginAnchoredSelection(index);
 353             } else {
 354                 const int current = m_selectionManager->currentItem();
 355                 m_selectionManager->setSelected(current);
 356             }
 357         }
 358         break;
 359
 360     case Qt::Key_Menu: {
 361         // Emit the signal itemContextMenuRequested() in case if at least one
 362         // item is selected. Otherwise the signal viewContextMenuRequested() will be emitted.
 363         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 364         int index = -1;
 365         if (selectedItems.count() >= 2) {
 366             const int currentItemIndex = m_selectionManager->currentItem();
 367             index = selectedItems.contains(currentItemIndex)
 368                     ? currentItemIndex : selectedItems.toList().first();
 369         } else if (selectedItems.count() == 1) {
 370             index = selectedItems.toList().first();
 371         }
 372
 373         if (index >= 0) {
 374             const QRectF contextRect = m_view->itemContextRect(index);
 375             const QPointF pos(m_view->scene()->views().first()->mapToGlobal(contextRect.bottomRight().toPoint()));
 376             emit itemContextMenuRequested(index, pos);
 377         } else {
 378             emit viewContextMenuRequested(QCursor::pos());
 379         }
 380         break;
 381     }
 382
 383     case Qt::Key_Escape:
 384         if (m_selectionBehavior != SingleSelection) {
 385             m_selectionManager->clearSelection();
 386         }
 387         m_keyboardManager->cancelSearch();
 388         break;
 389
 390     default:
 391         m_keyboardManager->addKeys(event->text());
 392         return false;
 393     }
 394
 395     if (m_selectionManager->currentItem() != index) {
 396         switch (m_selectionBehavior) {
 397         case NoSelection:
 398             m_selectionManager->setCurrentItem(index);
 399             break;
 400
 401         case SingleSelection:
 402             m_selectionManager->setCurrentItem(index);
 403             m_selectionManager->clearSelection();
 404             m_selectionManager->setSelected(index, 1);
 405             break;
 406
 407         case MultiSelection:
 408             if (controlPressed) {
 409                 m_selectionManager->endAnchoredSelection();
 410             }
 411
 412             m_selectionManager->setCurrentItem(index);
 413
 414             if (!shiftOrControlPressed) {
 415                 m_selectionManager->clearSelection();
 416                 m_selectionManager->setSelected(index, 1);
 417             }
 418
 419             if (!shiftPressed) {
 420                 m_selectionManager->beginAnchoredSelection(index);
 421             }
 422             break;
 423         }
 424
 425         m_view->scrollToItem(index);
 426     }
 427     return true;
 428 }
 429
 430 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 431 {
 432     if (!m_model || m_model->count() == 0) {
 433         return;
 434     }
 435     const int currentIndex = m_selectionManager->currentItem();
 436     int index;
 437     if (searchFromNextItem) {
 438         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 439     } else {
 440         index = m_model->indexForKeyboardSearch(text, currentIndex);
 441     }
 442     if (index >= 0) {
 443         m_selectionManager->setCurrentItem(index);
 444         m_selectionManager->clearSelection();
 445         m_selectionManager->setSelected(index, 1);
 446         m_selectionManager->beginAnchoredSelection(index);
 447         m_view->scrollToItem(index);
 448     }
 449 }
 450
 451 void KItemListController::slotAutoActivationTimeout()
 452 {
 453     if (!m_model || !m_view) {
 454         return;
 455     }
 456
 457     const int index = m_autoActivationTimer->property("index").toInt();
 458     if (index < 0 || index >= m_model->count()) {
 459         return;
 460     }
 461
 462     if (m_model->supportsDropping(index)) {
 463         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 464             const bool expanded = m_model->isExpanded(index);
 465             m_model->setExpanded(index, !expanded);
 466         } else {
 467             emit itemActivated(index);
 468         }
 469     }
 470 }
 471
 472 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 473 {
 474     Q_UNUSED(event);
 475     return false;
 476 }
 477
 478 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 479 {
 480     if (!m_view) {
 481         return false;
 482     }
 483
 484     m_pressedMousePos = transform.map(event->pos());
 485     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 486     emit mouseButtonPressed(m_pressedIndex, event->buttons());
 487
 488     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 489         m_selectionManager->endAnchoredSelection();
 490         m_selectionManager->setCurrentItem(m_pressedIndex);
 491         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 492         return true;
 493     }
 494
 495     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 496     if (m_selectionTogglePressed) {
 497         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 498         // The previous anchored selection has been finished already in
 499         // KItemListSelectionManager::setSelected(). We can safely change
 500         // the current item and start a new anchored selection now.
 501         m_selectionManager->setCurrentItem(m_pressedIndex);
 502         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 503         return true;
 504     }
 505
 506     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 507     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 508
 509     // The previous selection is cleared if either
 510     // 1. The selection mode is SingleSelection, or
 511     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 512     //    a) Shift or Control are pressed.
 513     //    b) The clicked item is selected already. In that case, the user might want to:
 514     //       - start dragging multiple items, or
 515     //       - open the context menu and perform an action for all selected items.
 516     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 517     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 518     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 519                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 520     if (clearSelection) {
 521         m_selectionManager->clearSelection();
 522     } else if (pressedItemAlreadySelected && !shiftOrControlPressed && (event->buttons() & Qt::LeftButton)) {
 523         // The user might want to start dragging multiple items, but if he clicks the item
 524         // in order to trigger it instead, the other selected items must be deselected.
 525         // However, we do not know yet what the user is going to do.
 526         // -> remember that the user pressed an item which had been selected already and
 527         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
 528         m_clearSelectionIfItemsAreNotDragged = true;
 529     }
 530
 531     if (!shiftPressed) {
 532         // Finish the anchored selection before the current index is changed
 533         m_selectionManager->endAnchoredSelection();
 534     }
 535
 536     if (m_pressedIndex >= 0) {
 537         m_selectionManager->setCurrentItem(m_pressedIndex);
 538
 539         switch (m_selectionBehavior) {
 540         case NoSelection:
 541             break;
 542
 543         case SingleSelection:
 544             m_selectionManager->setSelected(m_pressedIndex);
 545             break;
 546
 547         case MultiSelection:
 548             if (controlPressed) {
 549                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 550                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 551             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 552                 // Select the pressed item and start a new anchored selection
 553                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 554                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 555             }
 556             break;
 557
 558         default:
 559             Q_ASSERT(false);
 560             break;
 561         }
 562
 563         if (event->buttons() & Qt::RightButton) {
 564             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 565         }
 566
 567         return true;
 568     }
 569
 570     if (event->buttons() & Qt::RightButton) {
 571         const QRectF headerBounds = m_view->headerBoundaries();
 572         if (headerBounds.contains(event->pos())) {
 573             emit headerContextMenuRequested(event->screenPos());
 574         } else {
 575             emit viewContextMenuRequested(event->screenPos());
 576         }
 577         return true;
 578     }
 579
 580     if (m_selectionBehavior == MultiSelection) {
 581         QPointF startPos = m_pressedMousePos;
 582         if (m_view->scrollOrientation() == Qt::Vertical) {
 583             startPos.ry() += m_view->scrollOffset();
 584             if (m_view->itemSize().width() < 0) {
 585                 // Use a special rubberband for views that have only one column and
 586                 // expand the rubberband to use the whole width of the view.
 587                 startPos.setX(0);
 588             }
 589         } else {
 590             startPos.rx() += m_view->scrollOffset();
 591         }
 592
 593         m_oldSelection = m_selectionManager->selectedItems();
 594         KItemListRubberBand* rubberBand = m_view->rubberBand();
 595         rubberBand->setStartPosition(startPos);
 596         rubberBand->setEndPosition(startPos);
 597         rubberBand->setActive(true);
 598         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 599         m_view->setAutoScroll(true);
 600     }
 601
 602     return false;
 603 }
 604
 605 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 606 {
 607     if (!m_view) {
 608         return false;
 609     }
 610
 611     if (m_pressedIndex >= 0) {
 612         // Check whether a dragging should be started
 613         if (event->buttons() & Qt::LeftButton) {
 614             const QPointF pos = transform.map(event->pos());
 615             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 616                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 617                     // Always assure that the dragged item gets selected. Usually this is already
 618                     // done on the mouse-press event, but when using the selection-toggle on a
 619                     // selected item the dragged item is not selected yet.
 620                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 621                 } else {
 622                     // A selected item has been clicked to drag all selected items
 623                     // -> the selection should not be cleared when the mouse button is released.
 624                     m_clearSelectionIfItemsAreNotDragged = false;
 625                 }
 626
 627                 startDragging();
 628             }
 629         }
 630     } else {
 631         KItemListRubberBand* rubberBand = m_view->rubberBand();
 632         if (rubberBand->isActive()) {
 633             QPointF endPos = transform.map(event->pos());
 634
 635             // Update the current item.
 636             const int newCurrent = m_view->itemAt(endPos);
 637             if (newCurrent >= 0) {
 638                 // It's expected that the new current index is also the new anchor (bug 163451).
 639                 m_selectionManager->endAnchoredSelection();
 640                 m_selectionManager->setCurrentItem(newCurrent);
 641                 m_selectionManager->beginAnchoredSelection(newCurrent);
 642             }
 643
 644             if (m_view->scrollOrientation() == Qt::Vertical) {
 645                 endPos.ry() += m_view->scrollOffset();
 646                 if (m_view->itemSize().width() < 0) {
 647                     // Use a special rubberband for views that have only one column and
 648                     // expand the rubberband to use the whole width of the view.
 649                     endPos.setX(m_view->size().width());
 650                 }
 651             } else {
 652                 endPos.rx() += m_view->scrollOffset();
 653             }
 654             rubberBand->setEndPosition(endPos);
 655         }
 656     }
 657
 658     return false;
 659 }
 660
 661 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 662 {
 663     if (!m_view) {
 664         return false;
 665     }
 666
 667     emit mouseButtonReleased(m_pressedIndex, event->buttons());
 668
 669     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 670     if (isAboveSelectionToggle) {
 671         m_selectionTogglePressed = false;
 672         return true;
 673     }
 674
 675     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 676         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 677         m_selectionTogglePressed = false;
 678         return true;
 679     }
 680
 681     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 682                                        event->modifiers() & Qt::ControlModifier;
 683
 684     KItemListRubberBand* rubberBand = m_view->rubberBand();
 685     if (rubberBand->isActive()) {
 686         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 687         rubberBand->setActive(false);
 688         m_oldSelection.clear();
 689         m_view->setAutoScroll(false);
 690     }
 691
 692     const QPointF pos = transform.map(event->pos());
 693     const int index = m_view->itemAt(pos);
 694
 695     if (index >= 0 && index == m_pressedIndex) {
 696         // The release event is done above the same item as the press event
 697
 698         if (m_clearSelectionIfItemsAreNotDragged) {
 699             // A selected item has been clicked, but no drag operation has been started
 700             // -> clear the rest of the selection.
 701             m_selectionManager->clearSelection();
 702             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 703             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 704         }
 705
 706         if (event->button() & Qt::LeftButton) {
 707             bool emitItemActivated = true;
 708             if (m_view->isAboveExpansionToggle(index, pos)) {
 709                 const bool expanded = m_model->isExpanded(index);
 710                 m_model->setExpanded(index, !expanded);
 711
 712                 emit itemExpansionToggleClicked(index);
 713                 emitItemActivated = false;
 714             } else if (shiftOrControlPressed) {
 715                 // The mouse click should only update the selection, not trigger the item
 716                 emitItemActivated = false;
 717             } else if (!m_singleClickActivation) {
 718                 emitItemActivated = false;
 719             }
 720             if (emitItemActivated) {
 721                 emit itemActivated(index);
 722             }
 723         } else if (event->button() & Qt::MidButton) {
 724             emit itemMiddleClicked(index);
 725         }
 726     }
 727
 728     m_pressedMousePos = QPointF();
 729     m_pressedIndex = -1;
 730     m_clearSelectionIfItemsAreNotDragged = false;
 731     return false;
 732 }
 733
 734 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 735 {
 736     const QPointF pos = transform.map(event->pos());
 737     const int index = m_view->itemAt(pos);
 738
 739     bool emitItemActivated = !m_singleClickActivation &&
 740                              (event->button() & Qt::LeftButton) &&
 741                              index >= 0 && index < m_model->count();
 742     if (emitItemActivated) {
 743         emit itemActivated(index);
 744     }
 745     return false;
 746 }
 747
 748 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 749 {
 750     Q_UNUSED(event);
 751     Q_UNUSED(transform);
 752     return false;
 753 }
 754
 755 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 756 {
 757     Q_UNUSED(event);
 758     Q_UNUSED(transform);
 759
 760     m_view->setAutoScroll(false);
 761     m_view->hideDropIndicator();
 762
 763     KItemListWidget* widget = hoveredWidget();
 764     if (widget) {
 765         widget->setHovered(false);
 766         emit itemUnhovered(widget->index());
 767     }
 768     return false;
 769 }
 770
 771 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 772 {
 773     Q_UNUSED(transform);
 774     if (!m_model || !m_view) {
 775         return false;
 776     }
 777
 778     event->acceptProposedAction();
 779
 780     KItemListWidget* oldHoveredWidget = hoveredWidget();
 781
 782     const QPointF pos = transform.map(event->pos());
 783     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 784
 785     if (oldHoveredWidget != newHoveredWidget) {
 786         m_autoActivationTimer->stop();
 787
 788         if (oldHoveredWidget) {
 789             oldHoveredWidget->setHovered(false);
 790             emit itemUnhovered(oldHoveredWidget->index());
 791         }
 792
 793         if (newHoveredWidget) {
 794             const int index = newHoveredWidget->index();
 795             if (m_model->supportsDropping(index)) {
 796                 newHoveredWidget->setHovered(true);
 797             } else if (m_model->sortRole().isEmpty()) {
 798                 // The model supports the inserting of items on
 799                 // the given index as no sort-role has been
 800                 // specified. Assure that a drag-indicator
 801                 // is shown by the view.
 802                 const int dropIndex = m_view->showDropIndicator(pos);
 803                 Q_UNUSED(dropIndex); // TODO
 804             }
 805             emit itemHovered(index);
 806
 807             if (m_autoActivationTimer->interval() >= 0) {
 808                 m_autoActivationTimer->setProperty("index", index);
 809                 m_autoActivationTimer->start();
 810             }
 811         }
 812     }
 813
 814     return false;
 815 }
 816
 817 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 818 {
 819     Q_UNUSED(transform)
 820     if (!m_view) {
 821         return false;
 822     }
 823
 824     m_autoActivationTimer->stop();
 825     m_view->setAutoScroll(false);
 826
 827     const QPointF pos = transform.map(event->pos());
 828     const int index = m_view->itemAt(pos);
 829     emit itemDropEvent(index, event);
 830
 831     return true;
 832 }
 833
 834 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 835 {
 836     Q_UNUSED(event);
 837     Q_UNUSED(transform);
 838     return false;
 839 }
 840
 841 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 842 {
 843     Q_UNUSED(transform);
 844     if (!m_model || !m_view) {
 845         return false;
 846     }
 847
 848     KItemListWidget* oldHoveredWidget = hoveredWidget();
 849     const QPointF pos = transform.map(event->pos());
 850     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 851
 852     if (oldHoveredWidget != newHoveredWidget) {
 853         if (oldHoveredWidget) {
 854             oldHoveredWidget->setHovered(false);
 855             emit itemUnhovered(oldHoveredWidget->index());
 856         }
 857
 858         if (newHoveredWidget) {
 859             newHoveredWidget->setHovered(true);
 860             emit itemHovered(newHoveredWidget->index());
 861         }
 862     }
 863
 864     return false;
 865 }
 866
 867 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 868 {
 869     Q_UNUSED(event);
 870     Q_UNUSED(transform);
 871
 872     if (!m_model || !m_view) {
 873         return false;
 874     }
 875
 876     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 877         if (widget->isHovered()) {
 878             widget->setHovered(false);
 879             emit itemUnhovered(widget->index());
 880         }
 881     }
 882     return false;
 883 }
 884
 885 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 886 {
 887     Q_UNUSED(event);
 888     Q_UNUSED(transform);
 889     return false;
 890 }
 891
 892 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 893 {
 894     Q_UNUSED(event);
 895     Q_UNUSED(transform);
 896     return false;
 897 }
 898
 899 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 900 {
 901     if (!event) {
 902         return false;
 903     }
 904
 905     switch (event->type()) {
 906     case QEvent::KeyPress:
 907         return keyPressEvent(static_cast<QKeyEvent*>(event));
 908     case QEvent::InputMethod:
 909         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 910     case QEvent::GraphicsSceneMousePress:
 911         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 912     case QEvent::GraphicsSceneMouseMove:
 913         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 914     case QEvent::GraphicsSceneMouseRelease:
 915         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 916     case QEvent::GraphicsSceneMouseDoubleClick:
 917         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 918     case QEvent::GraphicsSceneWheel:
 919          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 920     case QEvent::GraphicsSceneDragEnter:
 921         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 922     case QEvent::GraphicsSceneDragLeave:
 923         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 924     case QEvent::GraphicsSceneDragMove:
 925         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 926     case QEvent::GraphicsSceneDrop:
 927         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 928     case QEvent::GraphicsSceneHoverEnter:
 929         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 930     case QEvent::GraphicsSceneHoverMove:
 931         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 932     case QEvent::GraphicsSceneHoverLeave:
 933         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 934     case QEvent::GraphicsSceneResize:
 935         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 936     default:
 937         break;
 938     }
 939
 940     return false;
 941 }
 942
 943 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 944 {
 945     if (!m_view) {
 946         return;
 947     }
 948
 949     KItemListRubberBand* rubberBand = m_view->rubberBand();
 950     if (rubberBand->isActive()) {
 951         const qreal diff = current - previous;
 952         // TODO: Ideally just QCursor::pos() should be used as
 953         // new end-position but it seems there is no easy way
 954         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 955         // (... or I just missed an easy way to do the mapping)
 956         QPointF endPos = rubberBand->endPosition();
 957         if (m_view->scrollOrientation() == Qt::Vertical) {
 958             endPos.ry() += diff;
 959         } else {
 960             endPos.rx() += diff;
 961         }
 962
 963         rubberBand->setEndPosition(endPos);
 964     }
 965 }
 966
 967 void KItemListController::slotRubberBandChanged()
 968 {
 969     if (!m_view || !m_model || m_model->count() <= 0) {
 970         return;
 971     }
 972
 973     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 974     const QPointF startPos = rubberBand->startPosition();
 975     const QPointF endPos = rubberBand->endPosition();
 976     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 977
 978     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 979     if (scrollVertical) {
 980         rubberBandRect.translate(0, -m_view->scrollOffset());
 981     } else {
 982         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 983     }
 984
 985     if (!m_oldSelection.isEmpty()) {
 986         // Clear the old selection that was available before the rubberband has
 987         // been activated in case if no Shift- or Control-key are pressed
 988         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 989                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 990         if (!shiftOrControlPressed) {
 991             m_oldSelection.clear();
 992         }
 993     }
 994
 995     QSet<int> selectedItems;
 996
 997     // Select all visible items that intersect with the rubberband
 998     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 999         const int index = widget->index();
1000
1001         const QRectF widgetRect = m_view->itemRect(index);
1002         if (widgetRect.intersects(rubberBandRect)) {
1003             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
1004             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
1005             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
1006                 selectedItems.insert(index);
1007             }
1008         }
1009     }
1010
1011     // Select all invisible items that intersect with the rubberband. Instead of
1012     // iterating all items only the area which might be touched by the rubberband
1013     // will be checked.
1014     const bool increaseIndex = scrollVertical ?
1015                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
1016
1017     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
1018     bool selectionFinished = false;
1019     do {
1020         const QRectF widgetRect = m_view->itemRect(index);
1021         if (widgetRect.intersects(rubberBandRect)) {
1022             selectedItems.insert(index);
1023         }
1024
1025         if (increaseIndex) {
1026             ++index;
1027             selectionFinished = (index >= m_model->count()) ||
1028                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
1029                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
1030         } else {
1031             --index;
1032             selectionFinished = (index < 0) ||
1033                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
1034                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
1035         }
1036     } while (!selectionFinished);
1037
1038     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1039         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1040         // Therefore, the new selection contains:
1041         // 1. All previously selected items which are not inside the rubberband, and
1042         // 2. all items inside the rubberband which have not been selected previously.
1043         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
1044     }
1045     else {
1046         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1047     }
1048 }
1049
1050 void KItemListController::startDragging()
1051 {
1052     if (!m_view || !m_model) {
1053         return;
1054     }
1055
1056     const QSet<int> selectedItems = m_selectionManager->selectedItems();
1057     if (selectedItems.isEmpty()) {
1058         return;
1059     }
1060
1061     QMimeData* data = m_model->createMimeData(selectedItems);
1062     if (!data) {
1063         return;
1064     }
1065
1066     // The created drag object will be owned and deleted
1067     // by QApplication::activeWindow().
1068     QDrag* drag = new QDrag(QApplication::activeWindow());
1069     drag->setMimeData(data);
1070
1071     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1072     drag->setPixmap(pixmap);
1073
1074     // TODO: The vertical hotspot of -24 should be replaced by the
1075     // height of the QCursor-pixmap.
1076     const QPoint hotSpot(pixmap.width() / 2, -24);
1077     drag->setHotSpot(hotSpot);
1078
1079     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1080 }
1081
1082 KItemListWidget* KItemListController::hoveredWidget() const
1083 {
1084     Q_ASSERT(m_view);
1085
1086     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1087         if (widget->isHovered()) {
1088             return widget;
1089         }
1090     }
1091
1092     return 0;
1093 }
1094
1095 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1096 {
1097     Q_ASSERT(m_view);
1098
1099     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1100         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1101
1102         const bool hovered = widget->contains(mappedPos) &&
1103                              !widget->expansionToggleRect().contains(mappedPos);
1104         if (hovered) {
1105             return widget;
1106         }
1107     }
1108
1109     return 0;
1110 }
1111
1112 void KItemListController::updateKeyboardAnchor()
1113 {
1114     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1115                              m_keyboardAnchorIndex < m_model->count() &&
1116                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1117     if (!validAnchor) {
1118         const int index = m_selectionManager->currentItem();
1119         m_keyboardAnchorIndex = index;
1120         m_keyboardAnchorPos = keyboardAnchorPos(index);
1121     }
1122 }
1123
1124 int KItemListController::nextRowIndex(int index) const
1125 {
1126     if (m_keyboardAnchorIndex < 0) {
1127         return index;
1128     }
1129
1130     const int maxIndex = m_model->count() - 1;
1131     if (index == maxIndex) {
1132         return index;
1133     }
1134
1135     // Calculate the index of the last column inside the row of the current index
1136     int lastColumnIndex = index;
1137     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1138         ++lastColumnIndex;
1139         if (lastColumnIndex >= maxIndex) {
1140             return index;
1141         }
1142     }
1143
1144     // Based on the last column index go to the next row and calculate the nearest index
1145     // that is below the current index
1146     int nextRowIndex = lastColumnIndex + 1;
1147     int searchIndex = nextRowIndex;
1148     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1149     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1150         ++searchIndex;
1151         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1152         if (searchDiff < minDiff) {
1153             minDiff = searchDiff;
1154             nextRowIndex = searchIndex;
1155         }
1156     }
1157
1158     return nextRowIndex;
1159 }
1160
1161 int KItemListController::previousRowIndex(int index) const
1162 {
1163     if (m_keyboardAnchorIndex < 0 || index == 0) {
1164         return index;
1165     }
1166
1167     // Calculate the index of the first column inside the row of the current index
1168     int firstColumnIndex = index;
1169     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1170         --firstColumnIndex;
1171         if (firstColumnIndex <= 0) {
1172             return index;
1173         }
1174     }
1175
1176     // Based on the first column index go to the previous row and calculate the nearest index
1177     // that is above the current index
1178     int previousRowIndex = firstColumnIndex - 1;
1179     int searchIndex = previousRowIndex;
1180     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1181     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1182         --searchIndex;
1183         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1184         if (searchDiff < minDiff) {
1185             minDiff = searchDiff;
1186             previousRowIndex = searchIndex;
1187         }
1188     }
1189
1190     return previousRowIndex;
1191 }
1192
1193 qreal KItemListController::keyboardAnchorPos(int index) const
1194 {
1195     const QRectF itemRect = m_view->itemRect(index);
1196     if (!itemRect.isEmpty()) {
1197         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1198     }
1199
1200     return 0;
1201 }
1202
1203 void KItemListController::updateExtendedSelectionRegion()
1204 {
1205     if (m_view) {
1206         const bool extend = (m_selectionBehavior != MultiSelection);
1207         KItemListStyleOption option = m_view->styleOption();
1208         if (option.extendedSelectionRegion != extend) {
1209             option.extendedSelectionRegion = extend;
1210             m_view->setStyleOption(option);
1211         }
1212     }
1213 }
1214
1215 #include "kitemlistcontroller.moc"