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     return false;
 714 }
 715
 716 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 717 {
 718     Q_UNUSED(transform);
 719     if (!m_model || !m_view) {
 720         return false;
 721     }
 722
 723     KItemListWidget* oldHoveredWidget = hoveredWidget();
 724
 725     const QPointF pos = transform.map(event->pos());
 726     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 727
 728     if (oldHoveredWidget != newHoveredWidget) {
 729         m_autoActivationTimer->stop();
 730
 731         if (oldHoveredWidget) {
 732             oldHoveredWidget->setHovered(false);
 733             emit itemUnhovered(oldHoveredWidget->index());
 734         }
 735
 736         if (newHoveredWidget) {
 737             const int index = newHoveredWidget->index();
 738             if (m_model->supportsDropping(index)) {
 739                 newHoveredWidget->setHovered(true);
 740             }
 741             emit itemHovered(index);
 742
 743             if (m_autoActivationTimer->interval() >= 0) {
 744                 m_autoActivationTimer->setProperty("index", index);
 745                 m_autoActivationTimer->start();
 746             }
 747         }
 748     }
 749
 750     return false;
 751 }
 752
 753 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 754 {
 755     Q_UNUSED(transform)
 756     if (!m_view) {
 757         return false;
 758     }
 759
 760     m_autoActivationTimer->stop();
 761
 762     const QPointF pos = transform.map(event->pos());
 763     const int index = m_view->itemAt(pos);
 764     emit itemDropEvent(index, event);
 765
 766     return true;
 767 }
 768
 769 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 770 {
 771     Q_UNUSED(event);
 772     Q_UNUSED(transform);
 773     return false;
 774 }
 775
 776 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 777 {
 778     Q_UNUSED(transform);
 779     if (!m_model || !m_view) {
 780         return false;
 781     }
 782
 783     KItemListWidget* oldHoveredWidget = hoveredWidget();
 784     const QPointF pos = transform.map(event->pos());
 785     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 786
 787     if (oldHoveredWidget != newHoveredWidget) {
 788         if (oldHoveredWidget) {
 789             oldHoveredWidget->setHovered(false);
 790             emit itemUnhovered(oldHoveredWidget->index());
 791         }
 792
 793         if (newHoveredWidget) {
 794             newHoveredWidget->setHovered(true);
 795             emit itemHovered(newHoveredWidget->index());
 796         }
 797     }
 798
 799     return false;
 800 }
 801
 802 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 803 {
 804     Q_UNUSED(event);
 805     Q_UNUSED(transform);
 806
 807     if (!m_model || !m_view) {
 808         return false;
 809     }
 810
 811     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 812         if (widget->isHovered()) {
 813             widget->setHovered(false);
 814             emit itemUnhovered(widget->index());
 815         }
 816     }
 817     return false;
 818 }
 819
 820 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 821 {
 822     Q_UNUSED(event);
 823     Q_UNUSED(transform);
 824     return false;
 825 }
 826
 827 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 828 {
 829     Q_UNUSED(event);
 830     Q_UNUSED(transform);
 831     return false;
 832 }
 833
 834 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 835 {
 836     if (!event) {
 837         return false;
 838     }
 839
 840     switch (event->type()) {
 841     case QEvent::KeyPress:
 842         return keyPressEvent(static_cast<QKeyEvent*>(event));
 843     case QEvent::InputMethod:
 844         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 845     case QEvent::GraphicsSceneMousePress:
 846         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 847     case QEvent::GraphicsSceneMouseMove:
 848         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 849     case QEvent::GraphicsSceneMouseRelease:
 850         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 851     case QEvent::GraphicsSceneMouseDoubleClick:
 852         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 853     case QEvent::GraphicsSceneWheel:
 854          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 855     case QEvent::GraphicsSceneDragEnter:
 856         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 857     case QEvent::GraphicsSceneDragLeave:
 858         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 859     case QEvent::GraphicsSceneDragMove:
 860         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 861     case QEvent::GraphicsSceneDrop:
 862         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 863     case QEvent::GraphicsSceneHoverEnter:
 864         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 865     case QEvent::GraphicsSceneHoverMove:
 866         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 867     case QEvent::GraphicsSceneHoverLeave:
 868         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 869     case QEvent::GraphicsSceneResize:
 870         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 871     default:
 872         break;
 873     }
 874
 875     return false;
 876 }
 877
 878 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 879 {
 880     if (!m_view) {
 881         return;
 882     }
 883
 884     KItemListRubberBand* rubberBand = m_view->rubberBand();
 885     if (rubberBand->isActive()) {
 886         const qreal diff = current - previous;
 887         // TODO: Ideally just QCursor::pos() should be used as
 888         // new end-position but it seems there is no easy way
 889         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 890         // (... or I just missed an easy way to do the mapping)
 891         QPointF endPos = rubberBand->endPosition();
 892         if (m_view->scrollOrientation() == Qt::Vertical) {
 893             endPos.ry() += diff;
 894         } else {
 895             endPos.rx() += diff;
 896         }
 897
 898         rubberBand->setEndPosition(endPos);
 899     }
 900 }
 901
 902 void KItemListController::slotRubberBandChanged()
 903 {
 904     if (!m_view || !m_model || m_model->count() <= 0) {
 905         return;
 906     }
 907
 908     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 909     const QPointF startPos = rubberBand->startPosition();
 910     const QPointF endPos = rubberBand->endPosition();
 911     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 912
 913     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 914     if (scrollVertical) {
 915         rubberBandRect.translate(0, -m_view->scrollOffset());
 916     } else {
 917         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 918     }
 919
 920     if (!m_oldSelection.isEmpty()) {
 921         // Clear the old selection that was available before the rubberband has
 922         // been activated in case if no Shift- or Control-key are pressed
 923         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 924                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 925         if (!shiftOrControlPressed) {
 926             m_oldSelection.clear();
 927         }
 928     }
 929
 930     QSet<int> selectedItems;
 931
 932     // Select all visible items that intersect with the rubberband
 933     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 934         const int index = widget->index();
 935
 936         const QRectF widgetRect = m_view->itemRect(index);
 937         if (widgetRect.intersects(rubberBandRect)) {
 938             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 939             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 940             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 941                 selectedItems.insert(index);
 942             }
 943         }
 944     }
 945
 946     // Select all invisible items that intersect with the rubberband. Instead of
 947     // iterating all items only the area which might be touched by the rubberband
 948     // will be checked.
 949     const bool increaseIndex = scrollVertical ?
 950                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 951
 952     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 953     bool selectionFinished = false;
 954     do {
 955         const QRectF widgetRect = m_view->itemRect(index);
 956         if (widgetRect.intersects(rubberBandRect)) {
 957             selectedItems.insert(index);
 958         }
 959
 960         if (increaseIndex) {
 961             ++index;
 962             selectionFinished = (index >= m_model->count()) ||
 963                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 964                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 965         } else {
 966             --index;
 967             selectionFinished = (index < 0) ||
 968                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 969                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 970         }
 971     } while (!selectionFinished);
 972
 973     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 974         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 975         // Therefore, the new selection contains:
 976         // 1. All previously selected items which are not inside the rubberband, and
 977         // 2. all items inside the rubberband which have not been selected previously.
 978         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 979     }
 980     else {
 981         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 982     }
 983 }
 984
 985 void KItemListController::startDragging()
 986 {
 987     if (!m_view || !m_model) {
 988         return;
 989     }
 990
 991     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 992     if (selectedItems.isEmpty()) {
 993         return;
 994     }
 995
 996     QMimeData* data = m_model->createMimeData(selectedItems);
 997     if (!data) {
 998         return;
 999     }
1000
1001     // The created drag object will be owned and deleted
1002     // by QApplication::activeWindow().
1003     QDrag* drag = new QDrag(QApplication::activeWindow());
1004     drag->setMimeData(data);
1005
1006     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1007     drag->setPixmap(pixmap);
1008
1009     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1010 }
1011
1012 KItemListWidget* KItemListController::hoveredWidget() const
1013 {
1014     Q_ASSERT(m_view);
1015
1016     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1017         if (widget->isHovered()) {
1018             return widget;
1019         }
1020     }
1021
1022     return 0;
1023 }
1024
1025 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1026 {
1027     Q_ASSERT(m_view);
1028
1029     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1030         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1031
1032         const bool hovered = widget->contains(mappedPos) &&
1033                              !widget->expansionToggleRect().contains(mappedPos);
1034         if (hovered) {
1035             return widget;
1036         }
1037     }
1038
1039     return 0;
1040 }
1041
1042 void KItemListController::updateKeyboardAnchor()
1043 {
1044     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1045                              m_keyboardAnchorIndex < m_model->count() &&
1046                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1047     if (!validAnchor) {
1048         const int index = m_selectionManager->currentItem();
1049         m_keyboardAnchorIndex = index;
1050         m_keyboardAnchorPos = keyboardAnchorPos(index);
1051     }
1052 }
1053
1054 int KItemListController::nextRowIndex(int index) const
1055 {
1056     if (m_keyboardAnchorIndex < 0) {
1057         return index;
1058     }
1059
1060     const int maxIndex = m_model->count() - 1;
1061     if (index == maxIndex) {
1062         return index;
1063     }
1064
1065     // Calculate the index of the last column inside the row of the current index
1066     int lastColumnIndex = index;
1067     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1068         ++lastColumnIndex;
1069         if (lastColumnIndex >= maxIndex) {
1070             return index;
1071         }
1072     }
1073
1074     // Based on the last column index go to the next row and calculate the nearest index
1075     // that is below the current index
1076     int nextRowIndex = lastColumnIndex + 1;
1077     int searchIndex = nextRowIndex;
1078     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1079     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1080         ++searchIndex;
1081         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1082         if (searchDiff < minDiff) {
1083             minDiff = searchDiff;
1084             nextRowIndex = searchIndex;
1085         }
1086     }
1087
1088     return nextRowIndex;
1089 }
1090
1091 int KItemListController::previousRowIndex(int index) const
1092 {
1093     if (m_keyboardAnchorIndex < 0 || index == 0) {
1094         return index;
1095     }
1096
1097     // Calculate the index of the first column inside the row of the current index
1098     int firstColumnIndex = index;
1099     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1100         --firstColumnIndex;
1101         if (firstColumnIndex <= 0) {
1102             return index;
1103         }
1104     }
1105
1106     // Based on the first column index go to the previous row and calculate the nearest index
1107     // that is above the current index
1108     int previousRowIndex = firstColumnIndex - 1;
1109     int searchIndex = previousRowIndex;
1110     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1111     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1112         --searchIndex;
1113         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1114         if (searchDiff < minDiff) {
1115             minDiff = searchDiff;
1116             previousRowIndex = searchIndex;
1117         }
1118     }
1119
1120     return previousRowIndex;
1121 }
1122
1123 qreal KItemListController::keyboardAnchorPos(int index) const
1124 {
1125     const QRectF itemRect = m_view->itemRect(index);
1126     if (!itemRect.isEmpty()) {
1127         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1128     }
1129
1130     return 0;
1131 }
1132
1133 #include "kitemlistcontroller.moc"