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     /* m_view->isUnderMouse() fixes a bug in the Folder-View-Panel and in the
 471      * Places-Panel.
 472      *
 473      * Bug: When you drag a file onto a Folder-View-Item or a Places-Item and
 474      * then move away before the auto-activation timeout triggers, than the
 475      * item still becomes activated/expanded.
 476      *
 477      * See Bug 293200 and 305783
 478      */
 479     if (m_model->supportsDropping(index) && m_view->isUnderMouse()) {
 480         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 481             const bool expanded = m_model->isExpanded(index);
 482             m_model->setExpanded(index, !expanded);
 483         } else {
 484             emit itemActivated(index);
 485         }
 486     }
 487 }
 488
 489 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 490 {
 491     Q_UNUSED(event);
 492     return false;
 493 }
 494
 495 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 496 {
 497     if (!m_view) {
 498         return false;
 499     }
 500
 501     m_pressedMousePos = transform.map(event->pos());
 502     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 503     emit mouseButtonPressed(m_pressedIndex, event->buttons());
 504
 505     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 506         m_selectionManager->endAnchoredSelection();
 507         m_selectionManager->setCurrentItem(m_pressedIndex);
 508         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 509         return true;
 510     }
 511
 512     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 513     if (m_selectionTogglePressed) {
 514         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 515         // The previous anchored selection has been finished already in
 516         // KItemListSelectionManager::setSelected(). We can safely change
 517         // the current item and start a new anchored selection now.
 518         m_selectionManager->setCurrentItem(m_pressedIndex);
 519         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 520         return true;
 521     }
 522
 523     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 524     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 525
 526     // The previous selection is cleared if either
 527     // 1. The selection mode is SingleSelection, or
 528     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 529     //    a) Shift or Control are pressed.
 530     //    b) The clicked item is selected already. In that case, the user might want to:
 531     //       - start dragging multiple items, or
 532     //       - open the context menu and perform an action for all selected items.
 533     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 534     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 535     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 536                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 537     if (clearSelection) {
 538         m_selectionManager->clearSelection();
 539     } else if (pressedItemAlreadySelected && !shiftOrControlPressed && (event->buttons() & Qt::LeftButton)) {
 540         // The user might want to start dragging multiple items, but if he clicks the item
 541         // in order to trigger it instead, the other selected items must be deselected.
 542         // However, we do not know yet what the user is going to do.
 543         // -> remember that the user pressed an item which had been selected already and
 544         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
 545         m_clearSelectionIfItemsAreNotDragged = true;
 546     }
 547
 548     if (!shiftPressed) {
 549         // Finish the anchored selection before the current index is changed
 550         m_selectionManager->endAnchoredSelection();
 551     }
 552
 553     if (m_pressedIndex >= 0) {
 554         m_selectionManager->setCurrentItem(m_pressedIndex);
 555
 556         switch (m_selectionBehavior) {
 557         case NoSelection:
 558             break;
 559
 560         case SingleSelection:
 561             m_selectionManager->setSelected(m_pressedIndex);
 562             break;
 563
 564         case MultiSelection:
 565             if (controlPressed && !shiftPressed) {
 566                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 567                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 568             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 569                 // Select the pressed item and start a new anchored selection
 570                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 571                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 572             }
 573             break;
 574
 575         default:
 576             Q_ASSERT(false);
 577             break;
 578         }
 579
 580         if (event->buttons() & Qt::RightButton) {
 581             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 582         }
 583
 584         return true;
 585     }
 586
 587     if (event->buttons() & Qt::RightButton) {
 588         const QRectF headerBounds = m_view->headerBoundaries();
 589         if (headerBounds.contains(event->pos())) {
 590             emit headerContextMenuRequested(event->screenPos());
 591         } else {
 592             emit viewContextMenuRequested(event->screenPos());
 593         }
 594         return true;
 595     }
 596
 597     if (m_selectionBehavior == MultiSelection) {
 598         QPointF startPos = m_pressedMousePos;
 599         if (m_view->scrollOrientation() == Qt::Vertical) {
 600             startPos.ry() += m_view->scrollOffset();
 601             if (m_view->itemSize().width() < 0) {
 602                 // Use a special rubberband for views that have only one column and
 603                 // expand the rubberband to use the whole width of the view.
 604                 startPos.setX(0);
 605             }
 606         } else {
 607             startPos.rx() += m_view->scrollOffset();
 608         }
 609
 610         m_oldSelection = m_selectionManager->selectedItems();
 611         KItemListRubberBand* rubberBand = m_view->rubberBand();
 612         rubberBand->setStartPosition(startPos);
 613         rubberBand->setEndPosition(startPos);
 614         rubberBand->setActive(true);
 615         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 616         m_view->setAutoScroll(true);
 617     }
 618
 619     return false;
 620 }
 621
 622 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 623 {
 624     if (!m_view) {
 625         return false;
 626     }
 627
 628     if (m_pressedIndex >= 0) {
 629         // Check whether a dragging should be started
 630         if (event->buttons() & Qt::LeftButton) {
 631             const QPointF pos = transform.map(event->pos());
 632             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 633                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 634                     // Always assure that the dragged item gets selected. Usually this is already
 635                     // done on the mouse-press event, but when using the selection-toggle on a
 636                     // selected item the dragged item is not selected yet.
 637                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 638                 } else {
 639                     // A selected item has been clicked to drag all selected items
 640                     // -> the selection should not be cleared when the mouse button is released.
 641                     m_clearSelectionIfItemsAreNotDragged = false;
 642                 }
 643
 644                 startDragging();
 645             }
 646         }
 647     } else {
 648         KItemListRubberBand* rubberBand = m_view->rubberBand();
 649         if (rubberBand->isActive()) {
 650             QPointF endPos = transform.map(event->pos());
 651
 652             // Update the current item.
 653             const int newCurrent = m_view->itemAt(endPos);
 654             if (newCurrent >= 0) {
 655                 // It's expected that the new current index is also the new anchor (bug 163451).
 656                 m_selectionManager->endAnchoredSelection();
 657                 m_selectionManager->setCurrentItem(newCurrent);
 658                 m_selectionManager->beginAnchoredSelection(newCurrent);
 659             }
 660
 661             if (m_view->scrollOrientation() == Qt::Vertical) {
 662                 endPos.ry() += m_view->scrollOffset();
 663                 if (m_view->itemSize().width() < 0) {
 664                     // Use a special rubberband for views that have only one column and
 665                     // expand the rubberband to use the whole width of the view.
 666                     endPos.setX(m_view->size().width());
 667                 }
 668             } else {
 669                 endPos.rx() += m_view->scrollOffset();
 670             }
 671             rubberBand->setEndPosition(endPos);
 672         }
 673     }
 674
 675     return false;
 676 }
 677
 678 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 679 {
 680     if (!m_view) {
 681         return false;
 682     }
 683
 684     emit mouseButtonReleased(m_pressedIndex, event->buttons());
 685
 686     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 687     if (isAboveSelectionToggle) {
 688         m_selectionTogglePressed = false;
 689         return true;
 690     }
 691
 692     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 693         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 694         m_selectionTogglePressed = false;
 695         return true;
 696     }
 697
 698     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 699                                        event->modifiers() & Qt::ControlModifier;
 700
 701     KItemListRubberBand* rubberBand = m_view->rubberBand();
 702     if (rubberBand->isActive()) {
 703         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 704         rubberBand->setActive(false);
 705         m_oldSelection.clear();
 706         m_view->setAutoScroll(false);
 707     }
 708
 709     const QPointF pos = transform.map(event->pos());
 710     const int index = m_view->itemAt(pos);
 711
 712     if (index >= 0 && index == m_pressedIndex) {
 713         // The release event is done above the same item as the press event
 714
 715         if (m_clearSelectionIfItemsAreNotDragged) {
 716             // A selected item has been clicked, but no drag operation has been started
 717             // -> clear the rest of the selection.
 718             m_selectionManager->clearSelection();
 719             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 720             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 721         }
 722
 723         if (event->button() & Qt::LeftButton) {
 724             bool emitItemActivated = true;
 725             if (m_view->isAboveExpansionToggle(index, pos)) {
 726                 const bool expanded = m_model->isExpanded(index);
 727                 m_model->setExpanded(index, !expanded);
 728
 729                 emit itemExpansionToggleClicked(index);
 730                 emitItemActivated = false;
 731             } else if (shiftOrControlPressed) {
 732                 // The mouse click should only update the selection, not trigger the item
 733                 emitItemActivated = false;
 734             } else if (!m_singleClickActivation) {
 735                 emitItemActivated = false;
 736             }
 737             if (emitItemActivated) {
 738                 emit itemActivated(index);
 739             }
 740         } else if (event->button() & Qt::MidButton) {
 741             emit itemMiddleClicked(index);
 742         }
 743     }
 744
 745     m_pressedMousePos = QPointF();
 746     m_pressedIndex = -1;
 747     m_clearSelectionIfItemsAreNotDragged = false;
 748     return false;
 749 }
 750
 751 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 752 {
 753     const QPointF pos = transform.map(event->pos());
 754     const int index = m_view->itemAt(pos);
 755
 756     bool emitItemActivated = !m_singleClickActivation &&
 757                              (event->button() & Qt::LeftButton) &&
 758                              index >= 0 && index < m_model->count();
 759     if (emitItemActivated) {
 760         emit itemActivated(index);
 761     }
 762     return false;
 763 }
 764
 765 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 766 {
 767     Q_UNUSED(event);
 768     Q_UNUSED(transform);
 769     return false;
 770 }
 771
 772 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 773 {
 774     Q_UNUSED(event);
 775     Q_UNUSED(transform);
 776
 777     m_view->setAutoScroll(false);
 778     m_view->hideDropIndicator();
 779
 780     KItemListWidget* widget = hoveredWidget();
 781     if (widget) {
 782         widget->setHovered(false);
 783         emit itemUnhovered(widget->index());
 784     }
 785     return false;
 786 }
 787
 788 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 789 {
 790     if (!m_model || !m_view) {
 791         return false;
 792     }
 793
 794     event->acceptProposedAction();
 795
 796     KItemListWidget* oldHoveredWidget = hoveredWidget();
 797
 798     const QPointF pos = transform.map(event->pos());
 799     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 800
 801     if (oldHoveredWidget != newHoveredWidget) {
 802         m_autoActivationTimer->stop();
 803
 804         if (oldHoveredWidget) {
 805             oldHoveredWidget->setHovered(false);
 806             emit itemUnhovered(oldHoveredWidget->index());
 807         }
 808
 809         if (newHoveredWidget) {
 810             bool droppingBetweenItems = false;
 811             if (m_model->sortRole().isEmpty()) {
 812                 // The model supports inserting items between other items.
 813                 droppingBetweenItems = (m_view->showDropIndicator(pos) >= 0);
 814             }
 815
 816             const int index = newHoveredWidget->index();
 817             if (!droppingBetweenItems && m_model->supportsDropping(index)) {
 818                 // Something has been dragged on an item.
 819                 m_view->hideDropIndicator();
 820                 newHoveredWidget->setHovered(true);
 821                 emit itemHovered(index);
 822
 823                 if (m_autoActivationTimer->interval() >= 0) {
 824                     m_autoActivationTimer->setProperty("index", index);
 825                     m_autoActivationTimer->start();
 826                 }
 827             }
 828         }
 829     }
 830
 831     return false;
 832 }
 833
 834 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 835 {
 836     if (!m_view) {
 837         return false;
 838     }
 839
 840     m_autoActivationTimer->stop();
 841     m_view->setAutoScroll(false);
 842
 843     const QPointF pos = transform.map(event->pos());
 844
 845     int dropAboveIndex = -1;
 846     if (m_model->sortRole().isEmpty()) {
 847         // The model supports inserting of items between other items.
 848         dropAboveIndex = m_view->showDropIndicator(pos);
 849     }
 850
 851     if (dropAboveIndex >= 0) {
 852         // Something has been dropped between two items.
 853         m_view->hideDropIndicator();
 854         emit aboveItemDropEvent(dropAboveIndex, event);
 855     } else {
 856         // Something has been dropped on an item or on an empty part of the view.
 857         emit itemDropEvent(m_view->itemAt(pos), event);
 858     }
 859
 860     return true;
 861 }
 862
 863 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 864 {
 865     Q_UNUSED(event);
 866     Q_UNUSED(transform);
 867     return false;
 868 }
 869
 870 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 871 {
 872     Q_UNUSED(transform);
 873     if (!m_model || !m_view) {
 874         return false;
 875     }
 876
 877     KItemListWidget* oldHoveredWidget = hoveredWidget();
 878     const QPointF pos = transform.map(event->pos());
 879     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 880
 881     if (oldHoveredWidget != newHoveredWidget) {
 882         if (oldHoveredWidget) {
 883             oldHoveredWidget->setHovered(false);
 884             emit itemUnhovered(oldHoveredWidget->index());
 885         }
 886
 887         if (newHoveredWidget) {
 888             newHoveredWidget->setHovered(true);
 889             emit itemHovered(newHoveredWidget->index());
 890         }
 891     }
 892
 893     return false;
 894 }
 895
 896 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 897 {
 898     Q_UNUSED(event);
 899     Q_UNUSED(transform);
 900
 901     if (!m_model || !m_view) {
 902         return false;
 903     }
 904
 905     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 906         if (widget->isHovered()) {
 907             widget->setHovered(false);
 908             emit itemUnhovered(widget->index());
 909         }
 910     }
 911     return false;
 912 }
 913
 914 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 915 {
 916     Q_UNUSED(event);
 917     Q_UNUSED(transform);
 918     return false;
 919 }
 920
 921 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 922 {
 923     Q_UNUSED(event);
 924     Q_UNUSED(transform);
 925     return false;
 926 }
 927
 928 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 929 {
 930     if (!event) {
 931         return false;
 932     }
 933
 934     switch (event->type()) {
 935     case QEvent::KeyPress:
 936         return keyPressEvent(static_cast<QKeyEvent*>(event));
 937     case QEvent::InputMethod:
 938         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 939     case QEvent::GraphicsSceneMousePress:
 940         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 941     case QEvent::GraphicsSceneMouseMove:
 942         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 943     case QEvent::GraphicsSceneMouseRelease:
 944         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 945     case QEvent::GraphicsSceneMouseDoubleClick:
 946         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 947     case QEvent::GraphicsSceneWheel:
 948          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 949     case QEvent::GraphicsSceneDragEnter:
 950         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 951     case QEvent::GraphicsSceneDragLeave:
 952         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 953     case QEvent::GraphicsSceneDragMove:
 954         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 955     case QEvent::GraphicsSceneDrop:
 956         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 957     case QEvent::GraphicsSceneHoverEnter:
 958         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 959     case QEvent::GraphicsSceneHoverMove:
 960         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 961     case QEvent::GraphicsSceneHoverLeave:
 962         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 963     case QEvent::GraphicsSceneResize:
 964         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 965     default:
 966         break;
 967     }
 968
 969     return false;
 970 }
 971
 972 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 973 {
 974     if (!m_view) {
 975         return;
 976     }
 977
 978     KItemListRubberBand* rubberBand = m_view->rubberBand();
 979     if (rubberBand->isActive()) {
 980         const qreal diff = current - previous;
 981         // TODO: Ideally just QCursor::pos() should be used as
 982         // new end-position but it seems there is no easy way
 983         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 984         // (... or I just missed an easy way to do the mapping)
 985         QPointF endPos = rubberBand->endPosition();
 986         if (m_view->scrollOrientation() == Qt::Vertical) {
 987             endPos.ry() += diff;
 988         } else {
 989             endPos.rx() += diff;
 990         }
 991
 992         rubberBand->setEndPosition(endPos);
 993     }
 994 }
 995
 996 void KItemListController::slotRubberBandChanged()
 997 {
 998     if (!m_view || !m_model || m_model->count() <= 0) {
 999         return;
1000     }
1001
1002     const KItemListRubberBand* rubberBand = m_view->rubberBand();
1003     const QPointF startPos = rubberBand->startPosition();
1004     const QPointF endPos = rubberBand->endPosition();
1005     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
1006
1007     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
1008     if (scrollVertical) {
1009         rubberBandRect.translate(0, -m_view->scrollOffset());
1010     } else {
1011         rubberBandRect.translate(-m_view->scrollOffset(), 0);
1012     }
1013
1014     if (!m_oldSelection.isEmpty()) {
1015         // Clear the old selection that was available before the rubberband has
1016         // been activated in case if no Shift- or Control-key are pressed
1017         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
1018                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
1019         if (!shiftOrControlPressed) {
1020             m_oldSelection.clear();
1021         }
1022     }
1023
1024     QSet<int> selectedItems;
1025
1026     // Select all visible items that intersect with the rubberband
1027     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1028         const int index = widget->index();
1029
1030         const QRectF widgetRect = m_view->itemRect(index);
1031         if (widgetRect.intersects(rubberBandRect)) {
1032             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
1033             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
1034             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
1035                 selectedItems.insert(index);
1036             }
1037         }
1038     }
1039
1040     // Select all invisible items that intersect with the rubberband. Instead of
1041     // iterating all items only the area which might be touched by the rubberband
1042     // will be checked.
1043     const bool increaseIndex = scrollVertical ?
1044                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
1045
1046     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
1047     bool selectionFinished = false;
1048     do {
1049         const QRectF widgetRect = m_view->itemRect(index);
1050         if (widgetRect.intersects(rubberBandRect)) {
1051             selectedItems.insert(index);
1052         }
1053
1054         if (increaseIndex) {
1055             ++index;
1056             selectionFinished = (index >= m_model->count()) ||
1057                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
1058                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
1059         } else {
1060             --index;
1061             selectionFinished = (index < 0) ||
1062                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
1063                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
1064         }
1065     } while (!selectionFinished);
1066
1067     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1068         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1069         // Therefore, the new selection contains:
1070         // 1. All previously selected items which are not inside the rubberband, and
1071         // 2. all items inside the rubberband which have not been selected previously.
1072         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
1073     }
1074     else {
1075         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1076     }
1077 }
1078
1079 void KItemListController::startDragging()
1080 {
1081     if (!m_view || !m_model) {
1082         return;
1083     }
1084
1085     const QSet<int> selectedItems = m_selectionManager->selectedItems();
1086     if (selectedItems.isEmpty()) {
1087         return;
1088     }
1089
1090     QMimeData* data = m_model->createMimeData(selectedItems);
1091     if (!data) {
1092         return;
1093     }
1094
1095     // The created drag object will be owned and deleted
1096     // by QApplication::activeWindow().
1097     QDrag* drag = new QDrag(QApplication::activeWindow());
1098     drag->setMimeData(data);
1099
1100     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1101     drag->setPixmap(pixmap);
1102
1103     const QPoint hotSpot(pixmap.width() / 2, 0);
1104     drag->setHotSpot(hotSpot);
1105
1106     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1107 }
1108
1109 KItemListWidget* KItemListController::hoveredWidget() const
1110 {
1111     Q_ASSERT(m_view);
1112
1113     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1114         if (widget->isHovered()) {
1115             return widget;
1116         }
1117     }
1118
1119     return 0;
1120 }
1121
1122 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1123 {
1124     Q_ASSERT(m_view);
1125
1126     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1127         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1128
1129         const bool hovered = widget->contains(mappedPos) &&
1130                              !widget->expansionToggleRect().contains(mappedPos);
1131         if (hovered) {
1132             return widget;
1133         }
1134     }
1135
1136     return 0;
1137 }
1138
1139 void KItemListController::updateKeyboardAnchor()
1140 {
1141     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1142                              m_keyboardAnchorIndex < m_model->count() &&
1143                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1144     if (!validAnchor) {
1145         const int index = m_selectionManager->currentItem();
1146         m_keyboardAnchorIndex = index;
1147         m_keyboardAnchorPos = keyboardAnchorPos(index);
1148     }
1149 }
1150
1151 int KItemListController::nextRowIndex(int index) const
1152 {
1153     if (m_keyboardAnchorIndex < 0) {
1154         return index;
1155     }
1156
1157     const int maxIndex = m_model->count() - 1;
1158     if (index == maxIndex) {
1159         return index;
1160     }
1161
1162     // Calculate the index of the last column inside the row of the current index
1163     int lastColumnIndex = index;
1164     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1165         ++lastColumnIndex;
1166         if (lastColumnIndex >= maxIndex) {
1167             return index;
1168         }
1169     }
1170
1171     // Based on the last column index go to the next row and calculate the nearest index
1172     // that is below the current index
1173     int nextRowIndex = lastColumnIndex + 1;
1174     int searchIndex = nextRowIndex;
1175     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1176     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1177         ++searchIndex;
1178         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1179         if (searchDiff < minDiff) {
1180             minDiff = searchDiff;
1181             nextRowIndex = searchIndex;
1182         }
1183     }
1184
1185     return nextRowIndex;
1186 }
1187
1188 int KItemListController::previousRowIndex(int index) const
1189 {
1190     if (m_keyboardAnchorIndex < 0 || index == 0) {
1191         return index;
1192     }
1193
1194     // Calculate the index of the first column inside the row of the current index
1195     int firstColumnIndex = index;
1196     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1197         --firstColumnIndex;
1198         if (firstColumnIndex <= 0) {
1199             return index;
1200         }
1201     }
1202
1203     // Based on the first column index go to the previous row and calculate the nearest index
1204     // that is above the current index
1205     int previousRowIndex = firstColumnIndex - 1;
1206     int searchIndex = previousRowIndex;
1207     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1208     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1209         --searchIndex;
1210         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1211         if (searchDiff < minDiff) {
1212             minDiff = searchDiff;
1213             previousRowIndex = searchIndex;
1214         }
1215     }
1216
1217     return previousRowIndex;
1218 }
1219
1220 qreal KItemListController::keyboardAnchorPos(int index) const
1221 {
1222     const QRectF itemRect = m_view->itemRect(index);
1223     if (!itemRect.isEmpty()) {
1224         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1225     }
1226
1227     return 0;
1228 }
1229
1230 void KItemListController::updateExtendedSelectionRegion()
1231 {
1232     if (m_view) {
1233         const bool extend = (m_selectionBehavior != MultiSelection);
1234         KItemListStyleOption option = m_view->styleOption();
1235         if (option.extendedSelectionRegion != extend) {
1236             option.extendedSelectionRegion = extend;
1237             m_view->setStyleOption(option);
1238         }
1239     }
1240 }
1241
1242 #include "kitemlistcontroller.moc"