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