src/kitemviews/kitemlistcontroller.cpp

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