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->endAnchoredSelection();
 384         m_selectionManager->setCurrentItem(m_pressedIndex);
 385         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 386         return true;
 387     }
 388
 389     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 390     if (m_selectionTogglePressed) {
 391         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 392         // The previous anchored selection has been finished already in
 393         // KItemListSelectionManager::setSelected(). We can safely change
 394         // the current item and start a new anchored selection now.
 395         m_selectionManager->setCurrentItem(m_pressedIndex);
 396         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 397         return true;
 398     }
 399
 400     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 401     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 402
 403     // The previous selection is cleared if either
 404     // 1. The selection mode is SingleSelection, or
 405     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 406     //    a) Shift or Control are pressed.
 407     //    b) The clicked item is selected already. In that case, the user might want to:
 408     //       - start dragging multiple items, or
 409     //       - open the context menu and perform an action for all selected items.
 410     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 411     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 412     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 413                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 414     if (clearSelection) {
 415         m_selectionManager->clearSelection();
 416     }
 417
 418     if (!shiftPressed) {
 419         // Finish the anchored selection before the current index is changed
 420         m_selectionManager->endAnchoredSelection();
 421     }
 422
 423     if (m_pressedIndex >= 0) {
 424         m_selectionManager->setCurrentItem(m_pressedIndex);
 425
 426         switch (m_selectionBehavior) {
 427         case NoSelection:
 428             break;
 429
 430         case SingleSelection:
 431             m_selectionManager->setSelected(m_pressedIndex);
 432             break;
 433
 434         case MultiSelection:
 435             if (controlPressed) {
 436                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 437                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 438             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 439                 // Select the pressed item and start a new anchored selection
 440                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 441                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 442             }
 443             break;
 444
 445         default:
 446             Q_ASSERT(false);
 447             break;
 448         }
 449
 450         if (event->buttons() & Qt::RightButton) {
 451             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 452         }
 453
 454         return true;
 455     }
 456
 457     if (event->buttons() & Qt::RightButton) {
 458         const QRectF headerBounds = m_view->headerBoundaries();
 459         if (headerBounds.contains(event->pos())) {
 460             emit headerContextMenuRequested(event->screenPos());
 461         } else {
 462             emit viewContextMenuRequested(event->screenPos());
 463         }
 464         return true;
 465     }
 466
 467     if (m_selectionBehavior == MultiSelection) {
 468         QPointF startPos = m_pressedMousePos;
 469         if (m_view->scrollOrientation() == Qt::Vertical) {
 470             startPos.ry() += m_view->scrollOffset();
 471             if (m_view->itemSize().width() < 0) {
 472                 // Use a special rubberband for views that have only one column and
 473                 // expand the rubberband to use the whole width of the view.
 474                 startPos.setX(0);
 475             }
 476         } else {
 477             startPos.rx() += m_view->scrollOffset();
 478         }
 479
 480         m_oldSelection = m_selectionManager->selectedItems();
 481         KItemListRubberBand* rubberBand = m_view->rubberBand();
 482         rubberBand->setStartPosition(startPos);
 483         rubberBand->setEndPosition(startPos);
 484         rubberBand->setActive(true);
 485         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 486         m_view->setAutoScroll(true);
 487     }
 488
 489     return false;
 490 }
 491
 492 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 493 {
 494     if (!m_view) {
 495         return false;
 496     }
 497
 498     if (m_pressedIndex >= 0) {
 499         // Check whether a dragging should be started
 500         if (event->buttons() & Qt::LeftButton) {
 501             const QPointF pos = transform.map(event->pos());
 502             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 503                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 504                     // Always assure that the dragged item gets selected. Usually this is already
 505                     // done on the mouse-press event, but when using the selection-toggle on a
 506                     // selected item the dragged item is not selected yet.
 507                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 508                 }
 509                 startDragging();
 510             }
 511         }
 512     } else {
 513         KItemListRubberBand* rubberBand = m_view->rubberBand();
 514         if (rubberBand->isActive()) {
 515             QPointF endPos = transform.map(event->pos());
 516
 517             // Update the current item.
 518             const int newCurrent = m_view->itemAt(endPos);
 519             if (newCurrent >= 0) {
 520                 // It's expected that the new current index is also the new anchor (bug 163451).
 521                 m_selectionManager->endAnchoredSelection();
 522                 m_selectionManager->setCurrentItem(newCurrent);
 523                 m_selectionManager->beginAnchoredSelection(newCurrent);
 524             }
 525
 526             if (m_view->scrollOrientation() == Qt::Vertical) {
 527                 endPos.ry() += m_view->scrollOffset();
 528                 if (m_view->itemSize().width() < 0) {
 529                     // Use a special rubberband for views that have only one column and
 530                     // expand the rubberband to use the whole width of the view.
 531                     endPos.setX(m_view->size().width());
 532                 }
 533             } else {
 534                 endPos.rx() += m_view->scrollOffset();
 535             }
 536             rubberBand->setEndPosition(endPos);
 537         }
 538     }
 539
 540     return false;
 541 }
 542
 543 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 544 {
 545     if (!m_view) {
 546         return false;
 547     }
 548
 549     if (m_pressedIndex >= 0) {
 550         emit itemReleased(m_pressedIndex, event->button());
 551     }
 552
 553     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 554     if (isAboveSelectionToggle) {
 555         m_selectionTogglePressed = false;
 556         return true;
 557     }
 558
 559     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 560         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 561         m_selectionTogglePressed = false;
 562         return true;
 563     }
 564
 565     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 566                                        event->modifiers() & Qt::ControlModifier;
 567
 568     KItemListRubberBand* rubberBand = m_view->rubberBand();
 569     if (rubberBand->isActive()) {
 570         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 571         rubberBand->setActive(false);
 572         m_oldSelection.clear();
 573         m_view->setAutoScroll(false);
 574     }
 575
 576     const QPointF pos = transform.map(event->pos());
 577     const int index = m_view->itemAt(pos);
 578
 579     if (index >= 0 && index == m_pressedIndex) {
 580         // The release event is done above the same item as the press event
 581
 582         if (event->button() & Qt::LeftButton) {
 583             bool emitItemActivated = true;
 584             if (m_view->isAboveExpansionToggle(index, pos)) {
 585                 const bool expanded = m_model->isExpanded(index);
 586                 m_model->setExpanded(index, !expanded);
 587
 588                 emit itemExpansionToggleClicked(index);
 589                 emitItemActivated = false;
 590             } else if (shiftOrControlPressed) {
 591                 // The mouse click should only update the selection, not trigger the item
 592                 emitItemActivated = false;
 593             } else if (!m_singleClickActivation) {
 594                 emitItemActivated = false;
 595             }
 596             if (emitItemActivated) {
 597                 emit itemActivated(index);
 598             }
 599         } else if (event->button() & Qt::MidButton) {
 600             emit itemMiddleClicked(index);
 601         }
 602     }
 603
 604     m_pressedMousePos = QPointF();
 605     m_pressedIndex = -1;
 606     return false;
 607 }
 608
 609 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 610 {
 611     const QPointF pos = transform.map(event->pos());
 612     const int index = m_view->itemAt(pos);
 613
 614     bool emitItemActivated = !m_singleClickActivation &&
 615                              (event->button() & Qt::LeftButton) &&
 616                              index >= 0 && index < m_model->count();
 617     if (emitItemActivated) {
 618         emit itemActivated(index);
 619     }
 620     return false;
 621 }
 622
 623 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 624 {
 625     Q_UNUSED(event);
 626     Q_UNUSED(transform);
 627     return false;
 628 }
 629
 630 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 631 {
 632     Q_UNUSED(event);
 633     Q_UNUSED(transform);
 634     return false;
 635 }
 636
 637 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 638 {
 639     Q_UNUSED(transform);
 640     if (!m_model || !m_view) {
 641         return false;
 642     }
 643
 644     KItemListWidget* oldHoveredWidget = hoveredWidget();
 645
 646     const QPointF pos = transform.map(event->pos());
 647     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 648
 649     if (oldHoveredWidget != newHoveredWidget) {
 650         m_autoActivationTimer->stop();
 651
 652         if (oldHoveredWidget) {
 653             oldHoveredWidget->setHovered(false);
 654             emit itemUnhovered(oldHoveredWidget->index());
 655         }
 656
 657         if (newHoveredWidget) {
 658             const int index = newHoveredWidget->index();
 659             if (m_model->supportsDropping(index)) {
 660                 newHoveredWidget->setHovered(true);
 661             }
 662             emit itemHovered(index);
 663
 664             if (m_autoActivationTimer->interval() >= 0) {
 665                 m_autoActivationTimer->setProperty("index", index);
 666                 m_autoActivationTimer->start();
 667             }
 668         }
 669     }
 670
 671     return false;
 672 }
 673
 674 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 675 {
 676     Q_UNUSED(transform)
 677     if (!m_view) {
 678         return false;
 679     }
 680
 681     m_autoActivationTimer->stop();
 682
 683     const QPointF pos = transform.map(event->pos());
 684     const int index = m_view->itemAt(pos);
 685     emit itemDropEvent(index, event);
 686
 687     return true;
 688 }
 689
 690 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 691 {
 692     Q_UNUSED(event);
 693     Q_UNUSED(transform);
 694     return false;
 695 }
 696
 697 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 698 {
 699     Q_UNUSED(transform);
 700     if (!m_model || !m_view) {
 701         return false;
 702     }
 703
 704     KItemListWidget* oldHoveredWidget = hoveredWidget();
 705     const QPointF pos = transform.map(event->pos());
 706     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 707
 708     if (oldHoveredWidget != newHoveredWidget) {
 709         if (oldHoveredWidget) {
 710             oldHoveredWidget->setHovered(false);
 711             emit itemUnhovered(oldHoveredWidget->index());
 712         }
 713
 714         if (newHoveredWidget) {
 715             newHoveredWidget->setHovered(true);
 716             emit itemHovered(newHoveredWidget->index());
 717         }
 718     }
 719
 720     return false;
 721 }
 722
 723 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 724 {
 725     Q_UNUSED(event);
 726     Q_UNUSED(transform);
 727
 728     if (!m_model || !m_view) {
 729         return false;
 730     }
 731
 732     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 733         if (widget->isHovered()) {
 734             widget->setHovered(false);
 735             emit itemUnhovered(widget->index());
 736         }
 737     }
 738     return false;
 739 }
 740
 741 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 742 {
 743     Q_UNUSED(event);
 744     Q_UNUSED(transform);
 745     return false;
 746 }
 747
 748 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 749 {
 750     Q_UNUSED(event);
 751     Q_UNUSED(transform);
 752     return false;
 753 }
 754
 755 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 756 {
 757     if (!event) {
 758         return false;
 759     }
 760
 761     switch (event->type()) {
 762     case QEvent::KeyPress:
 763         return keyPressEvent(static_cast<QKeyEvent*>(event));
 764     case QEvent::InputMethod:
 765         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 766     case QEvent::GraphicsSceneMousePress:
 767         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 768     case QEvent::GraphicsSceneMouseMove:
 769         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 770     case QEvent::GraphicsSceneMouseRelease:
 771         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 772     case QEvent::GraphicsSceneMouseDoubleClick:
 773         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 774     case QEvent::GraphicsSceneWheel:
 775          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 776     case QEvent::GraphicsSceneDragEnter:
 777         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 778     case QEvent::GraphicsSceneDragLeave:
 779         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 780     case QEvent::GraphicsSceneDragMove:
 781         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 782     case QEvent::GraphicsSceneDrop:
 783         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 784     case QEvent::GraphicsSceneHoverEnter:
 785         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 786     case QEvent::GraphicsSceneHoverMove:
 787         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 788     case QEvent::GraphicsSceneHoverLeave:
 789         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 790     case QEvent::GraphicsSceneResize:
 791         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 792     default:
 793         break;
 794     }
 795
 796     return false;
 797 }
 798
 799 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 800 {
 801     if (!m_view) {
 802         return;
 803     }
 804
 805     KItemListRubberBand* rubberBand = m_view->rubberBand();
 806     if (rubberBand->isActive()) {
 807         const qreal diff = current - previous;
 808         // TODO: Ideally just QCursor::pos() should be used as
 809         // new end-position but it seems there is no easy way
 810         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 811         // (... or I just missed an easy way to do the mapping)
 812         QPointF endPos = rubberBand->endPosition();
 813         if (m_view->scrollOrientation() == Qt::Vertical) {
 814             endPos.ry() += diff;
 815         } else {
 816             endPos.rx() += diff;
 817         }
 818
 819         rubberBand->setEndPosition(endPos);
 820     }
 821 }
 822
 823 void KItemListController::slotRubberBandChanged()
 824 {
 825     if (!m_view || !m_model || m_model->count() <= 0) {
 826         return;
 827     }
 828
 829     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 830     const QPointF startPos = rubberBand->startPosition();
 831     const QPointF endPos = rubberBand->endPosition();
 832     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 833
 834     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 835     if (scrollVertical) {
 836         rubberBandRect.translate(0, -m_view->scrollOffset());
 837     } else {
 838         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 839     }
 840
 841     if (!m_oldSelection.isEmpty()) {
 842         // Clear the old selection that was available before the rubberband has
 843         // been activated in case if no Shift- or Control-key are pressed
 844         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 845                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 846         if (!shiftOrControlPressed) {
 847             m_oldSelection.clear();
 848         }
 849     }
 850
 851     QSet<int> selectedItems;
 852
 853     // Select all visible items that intersect with the rubberband
 854     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 855         const int index = widget->index();
 856
 857         const QRectF widgetRect = m_view->itemRect(index);
 858         if (widgetRect.intersects(rubberBandRect)) {
 859             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 860             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 861             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 862                 selectedItems.insert(index);
 863             }
 864         }
 865     }
 866
 867     // Select all invisible items that intersect with the rubberband. Instead of
 868     // iterating all items only the area which might be touched by the rubberband
 869     // will be checked.
 870     const bool increaseIndex = scrollVertical ?
 871                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 872
 873     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 874     bool selectionFinished = false;
 875     do {
 876         const QRectF widgetRect = m_view->itemRect(index);
 877         if (widgetRect.intersects(rubberBandRect)) {
 878             selectedItems.insert(index);
 879         }
 880
 881         if (increaseIndex) {
 882             ++index;
 883             selectionFinished = (index >= m_model->count()) ||
 884                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 885                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 886         } else {
 887             --index;
 888             selectionFinished = (index < 0) ||
 889                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 890                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 891         }
 892     } while (!selectionFinished);
 893
 894     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 895         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 896         // Therefore, the new selection contains:
 897         // 1. All previously selected items which are not inside the rubberband, and
 898         // 2. all items inside the rubberband which have not been selected previously.
 899         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 900     }
 901     else {
 902         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 903     }
 904 }
 905
 906 void KItemListController::startDragging()
 907 {
 908     if (!m_view || !m_model) {
 909         return;
 910     }
 911
 912     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 913     if (selectedItems.isEmpty()) {
 914         return;
 915     }
 916
 917     QMimeData* data = m_model->createMimeData(selectedItems);
 918     if (!data) {
 919         return;
 920     }
 921
 922     // The created drag object will be owned and deleted
 923     // by QApplication::activeWindow().
 924     QDrag* drag = new QDrag(QApplication::activeWindow());
 925     drag->setMimeData(data);
 926
 927     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 928     drag->setPixmap(pixmap);
 929
 930     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
 931 }
 932
 933 KItemListWidget* KItemListController::hoveredWidget() const
 934 {
 935     Q_ASSERT(m_view);
 936
 937     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 938         if (widget->isHovered()) {
 939             return widget;
 940         }
 941     }
 942
 943     return 0;
 944 }
 945
 946 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 947 {
 948     Q_ASSERT(m_view);
 949
 950     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 951         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 952
 953         const bool hovered = widget->contains(mappedPos) &&
 954                              !widget->expansionToggleRect().contains(mappedPos);
 955         if (hovered) {
 956             return widget;
 957         }
 958     }
 959
 960     return 0;
 961 }
 962
 963 void KItemListController::updateKeyboardAnchor()
 964 {
 965     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
 966                              m_keyboardAnchorIndex < m_model->count() &&
 967                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
 968     if (!validAnchor) {
 969         const int index = m_selectionManager->currentItem();
 970         m_keyboardAnchorIndex = index;
 971         m_keyboardAnchorPos = keyboardAnchorPos(index);
 972     }
 973 }
 974
 975 int KItemListController::nextRowIndex() const
 976 {
 977     const int currentIndex = m_selectionManager->currentItem();
 978     if (m_keyboardAnchorIndex < 0) {
 979         return currentIndex;
 980     }
 981
 982     const int maxIndex = m_model->count() - 1;
 983     if (currentIndex == maxIndex) {
 984         return currentIndex;
 985     }
 986
 987     // Calculate the index of the last column inside the row of the current index
 988     int lastColumnIndex = currentIndex;
 989     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
 990         ++lastColumnIndex;
 991         if (lastColumnIndex >= maxIndex) {
 992             return currentIndex;
 993         }
 994     }
 995
 996     // Based on the last column index go to the next row and calculate the nearest index
 997     // that is below the current index
 998     int nextRowIndex = lastColumnIndex + 1;
 999     int searchIndex = nextRowIndex;
1000     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1001     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1002         ++searchIndex;
1003         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1004         if (searchDiff < minDiff) {
1005             minDiff = searchDiff;
1006             nextRowIndex = searchIndex;
1007         }
1008     }
1009
1010     return nextRowIndex;
1011 }
1012
1013 int KItemListController::previousRowIndex() const
1014 {
1015     const int currentIndex = m_selectionManager->currentItem();
1016     if (m_keyboardAnchorIndex < 0 || currentIndex == 0) {
1017         return currentIndex;
1018     }
1019
1020     // Calculate the index of the first column inside the row of the current index
1021     int firstColumnIndex = currentIndex;
1022     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1023         --firstColumnIndex;
1024         if (firstColumnIndex <= 0) {
1025             return currentIndex;
1026         }
1027     }
1028
1029     // Based on the first column index go to the previous row and calculate the nearest index
1030     // that is above the current index
1031     int previousRowIndex = firstColumnIndex - 1;
1032     int searchIndex = previousRowIndex;
1033     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1034     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1035         --searchIndex;
1036         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1037         if (searchDiff < minDiff) {
1038             minDiff = searchDiff;
1039             previousRowIndex = searchIndex;
1040         }
1041     }
1042
1043     return previousRowIndex;
1044 }
1045
1046 qreal KItemListController::keyboardAnchorPos(int index) const
1047 {
1048     const QRectF itemRect = m_view->itemRect(index);
1049     if (!itemRect.isEmpty()) {
1050         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1051     }
1052
1053     return 0;
1054 }
1055
1056 #include "kitemlistcontroller.moc"