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 <QGraphicsSceneEvent>
  34 #include <QMimeData>
  35 #include <QTimer>
  36
  37 #include <KGlobalSettings>
  38 #include <KDebug>
  39
  40 KItemListController::KItemListController(QObject* parent) :
  41     QObject(parent),
  42     m_selectionTogglePressed(false),
  43     m_selectionBehavior(NoSelection),
  44     m_model(0),
  45     m_view(0),
  46     m_selectionManager(new KItemListSelectionManager(this)),
  47     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  48     m_pressedIndex(-1),
  49     m_pressedMousePos(),
  50     m_autoActivationTimer(0),
  51     m_oldSelection()
  52 {
  53     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
  54             this, SLOT(slotChangeCurrentItem(QString,bool)));
  55
  56     m_autoActivationTimer = new QTimer(this);
  57     m_autoActivationTimer->setSingleShot(true);
  58     m_autoActivationTimer->setInterval(-1);
  59     connect(m_autoActivationTimer, SIGNAL(timeout()), this, SLOT(slotAutoActivationTimeout()));
  60 }
  61
  62 KItemListController::~KItemListController()
  63 {
  64 }
  65
  66 void KItemListController::setModel(KItemModelBase* model)
  67 {
  68     if (m_model == model) {
  69         return;
  70     }
  71
  72     KItemModelBase* oldModel = m_model;
  73     m_model = model;
  74
  75     if (m_view) {
  76         m_view->setModel(m_model);
  77     }
  78
  79     m_selectionManager->setModel(m_model);
  80
  81     emit modelChanged(m_model, oldModel);
  82 }
  83
  84 KItemModelBase* KItemListController::model() const
  85 {
  86     return m_model;
  87 }
  88
  89 KItemListSelectionManager* KItemListController::selectionManager() const
  90 {
  91     return m_selectionManager;
  92 }
  93
  94 void KItemListController::setView(KItemListView* view)
  95 {
  96     if (m_view == view) {
  97         return;
  98     }
  99
 100     KItemListView* oldView = m_view;
 101     if (oldView) {
 102         disconnect(oldView, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 103     }
 104
 105     m_view = view;
 106
 107     if (m_view) {
 108         m_view->setController(this);
 109         m_view->setModel(m_model);
 110         connect(m_view, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 111     }
 112
 113     emit viewChanged(m_view, oldView);
 114 }
 115
 116 KItemListView* KItemListController::view() const
 117 {
 118     return m_view;
 119 }
 120
 121 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 122 {
 123     m_selectionBehavior = behavior;
 124 }
 125
 126 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 127 {
 128     return m_selectionBehavior;
 129 }
 130
 131 void KItemListController::setAutoActivationDelay(int delay)
 132 {
 133     m_autoActivationTimer->setInterval(delay);
 134 }
 135
 136 int KItemListController::autoActivationDelay() const
 137 {
 138     return m_autoActivationTimer->interval();
 139 }
 140
 141 bool KItemListController::showEvent(QShowEvent* event)
 142 {
 143     Q_UNUSED(event);
 144     return false;
 145 }
 146
 147 bool KItemListController::hideEvent(QHideEvent* event)
 148 {
 149     Q_UNUSED(event);
 150     return false;
 151 }
 152
 153 bool KItemListController::keyPressEvent(QKeyEvent* event)
 154 {
 155     int index = m_selectionManager->currentItem();
 156     int key = event->key();
 157
 158     // Handle the expanding/collapsing of items
 159     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 160         if (key == Qt::Key_Right) {
 161             if (m_model->setExpanded(index, true)) {
 162                 return true;
 163             }
 164         } else if (key == Qt::Key_Left) {
 165             if (m_model->setExpanded(index, false)) {
 166                 return true;
 167             }
 168         }
 169     }
 170
 171     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 172     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 173     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 174
 175     const int itemCount = m_model->count();
 176     const int itemsPerRow = m_view->itemsPerOffset();
 177
 178     // For horizontal scroll orientation, transform
 179     // the arrow keys to simplify the event handling.
 180     if (m_view->scrollOrientation() == Qt::Horizontal) {
 181         switch (key) {
 182         case Qt::Key_Up:    key = Qt::Key_Left; break;
 183         case Qt::Key_Down:  key = Qt::Key_Right; break;
 184         case Qt::Key_Left:  key = Qt::Key_Up; break;
 185         case Qt::Key_Right: key = Qt::Key_Down; break;
 186         default:            break;
 187         }
 188     }
 189
 190
 191     switch (key) {
 192     case Qt::Key_Home:
 193         index = 0;
 194         break;
 195
 196     case Qt::Key_End:
 197         index = itemCount - 1;
 198         break;
 199
 200     case Qt::Key_Left:
 201         if (index > 0) {
 202             index--;
 203         }
 204         break;
 205
 206     case Qt::Key_Right:
 207         if (index < itemCount - 1) {
 208             index++;
 209         }
 210         break;
 211
 212     case Qt::Key_Up:
 213         if (index >= itemsPerRow) {
 214             index -= itemsPerRow;
 215         }
 216         break;
 217
 218     case Qt::Key_Down:
 219         if (index + itemsPerRow < itemCount) {
 220             // We are not in the last row yet.
 221             index += itemsPerRow;
 222         }
 223         else {
 224             // We are either in the last row already, or we are in the second-last row,
 225             // and there is no item below the current item.
 226             // In the latter case, we jump to the very last item.
 227             const int currentColumn = index % itemsPerRow;
 228             const int lastItemColumn = (itemCount - 1) % itemsPerRow;
 229             const bool inLastRow = currentColumn < lastItemColumn;
 230             if (!inLastRow) {
 231                 index = itemCount - 1;
 232             }
 233         }
 234         break;
 235
 236     case Qt::Key_Enter:
 237     case Qt::Key_Return: {
 238         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 239         if (selectedItems.count() >= 2) {
 240             emit itemsActivated(selectedItems);
 241         } else if (selectedItems.count() == 1) {
 242             emit itemActivated(selectedItems.toList().first());
 243         } else {
 244             emit itemActivated(index);
 245         }
 246         break;
 247     }
 248
 249     case Qt::Key_Space:
 250         if (controlPressed) {
 251             m_selectionManager->endAnchoredSelection();
 252             m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 253             m_selectionManager->beginAnchoredSelection(index);
 254             break;
 255         }
 256
 257     default:
 258         m_keyboardManager->addKeys(event->text());
 259         return false;
 260     }
 261
 262     if (m_selectionManager->currentItem() != index) {
 263         if (controlPressed) {
 264             m_selectionManager->endAnchoredSelection();
 265         }
 266
 267         m_selectionManager->setCurrentItem(index);
 268
 269         if (!shiftOrControlPressed || m_selectionBehavior == SingleSelection) {
 270             m_selectionManager->clearSelection();
 271             m_selectionManager->setSelected(index, 1);
 272         }
 273
 274         if (!shiftPressed) {
 275             m_selectionManager->beginAnchoredSelection(index);
 276         }
 277
 278         m_view->scrollToItem(index);
 279     }
 280     return true;
 281 }
 282
 283 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 284 {
 285     if (!m_model || m_model->count() == 0) {
 286         return;
 287     }
 288     const int currentIndex = m_selectionManager->currentItem();
 289     int index;
 290     if (searchFromNextItem) {
 291         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 292     }
 293     else {
 294         index = m_model->indexForKeyboardSearch(text, currentIndex);
 295     }
 296     if (index >= 0) {
 297         m_selectionManager->setCurrentItem(index);
 298         m_selectionManager->clearSelection();
 299         m_selectionManager->setSelected(index, 1);
 300         m_selectionManager->beginAnchoredSelection(index);
 301     }
 302 }
 303
 304 void KItemListController::slotAutoActivationTimeout()
 305 {
 306     if (!m_model || !m_view) {
 307         return;
 308     }
 309
 310     const int index = m_autoActivationTimer->property("index").toInt();
 311     if (index < 0 || index >= m_model->count()) {
 312         return;
 313     }
 314
 315     if (m_model->supportsDropping(index)) {
 316         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 317             const bool expanded = m_model->isExpanded(index);
 318             m_model->setExpanded(index, !expanded);
 319         } else {
 320             emit itemActivated(index);
 321         }
 322     }
 323 }
 324
 325 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 326 {
 327     Q_UNUSED(event);
 328     return false;
 329 }
 330
 331 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 332 {
 333     if (!m_view) {
 334         return false;
 335     }
 336
 337     m_pressedMousePos = transform.map(event->pos());
 338     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 339
 340     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 341         m_selectionManager->setCurrentItem(m_pressedIndex);
 342         return true;
 343     }
 344
 345     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 346     if (m_selectionTogglePressed) {
 347         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 348         return true;
 349     }
 350
 351     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 352     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 353
 354     if (m_selectionBehavior == SingleSelection) {
 355         m_selectionManager->clearSelection();
 356     }
 357
 358     if (!shiftPressed) {
 359         // Finish the anchored selection before the current index is changed
 360         m_selectionManager->endAnchoredSelection();
 361     }
 362
 363     if (m_pressedIndex >= 0) {
 364         m_selectionManager->setCurrentItem(m_pressedIndex);
 365
 366         switch (m_selectionBehavior) {
 367         case NoSelection:
 368             break;
 369
 370         case SingleSelection:
 371             m_selectionManager->setSelected(m_pressedIndex);
 372             break;
 373
 374         case MultiSelection:
 375             if (controlPressed) {
 376                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 377                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 378             } else if (event->buttons() & Qt::RightButton) {
 379                 // Only clear the selection if a context menu is requested above a non-selected item
 380                 if (!m_selectionManager->selectedItems().contains(m_pressedIndex)) {
 381                     m_selectionManager->setSelectedItems(QSet<int>() << m_pressedIndex);
 382                 }
 383             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 384                 // Select the pressed item and start a new anchored selection
 385                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 386                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 387             }
 388             break;
 389
 390         default:
 391             Q_ASSERT(false);
 392             break;
 393         }
 394
 395         if (event->buttons() & Qt::RightButton) {
 396             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 397         }
 398
 399         return true;
 400     }
 401
 402     if (event->buttons() & Qt::RightButton) {
 403         m_selectionManager->clearSelection();
 404
 405         const QRectF headerBounds = m_view->headerBoundaries();
 406         if (headerBounds.contains(event->pos())) {
 407             emit headerContextMenuRequested(event->screenPos());
 408         } else {
 409             emit viewContextMenuRequested(event->screenPos());
 410         }
 411         return true;
 412     }
 413
 414     if (m_selectionBehavior == MultiSelection) {
 415         QPointF startPos = m_pressedMousePos;
 416         if (m_view->scrollOrientation() == Qt::Vertical) {
 417             startPos.ry() += m_view->scrollOffset();
 418             if (m_view->itemSize().width() < 0) {
 419                 // Use a special rubberband for views that have only one column and
 420                 // expand the rubberband to use the whole width of the view.
 421                 startPos.setX(0);
 422             }
 423         } else {
 424             startPos.rx() += m_view->scrollOffset();
 425         }
 426
 427         m_oldSelection = m_selectionManager->selectedItems();
 428         KItemListRubberBand* rubberBand = m_view->rubberBand();
 429         rubberBand->setStartPosition(startPos);
 430         rubberBand->setEndPosition(startPos);
 431         rubberBand->setActive(true);
 432         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 433         m_view->setAutoScroll(true);
 434     }
 435
 436     return false;
 437 }
 438
 439 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 440 {
 441     if (!m_view) {
 442         return false;
 443     }
 444
 445     if (m_pressedIndex >= 0) {
 446         // Check whether a dragging should be started
 447         if (event->buttons() & Qt::LeftButton) {
 448             const QPointF pos = transform.map(event->pos());
 449             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 450                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 451                     // Always assure that the dragged item gets selected. Usually this is already
 452                     // done on the mouse-press event, but when using the selection-toggle on a
 453                     // selected item the dragged item is not selected yet.
 454                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 455                 }
 456                 startDragging();
 457             }
 458         }
 459     } else {
 460         KItemListRubberBand* rubberBand = m_view->rubberBand();
 461         if (rubberBand->isActive()) {
 462             QPointF endPos = transform.map(event->pos());
 463             if (m_view->scrollOrientation() == Qt::Vertical) {
 464                 endPos.ry() += m_view->scrollOffset();
 465                 if (m_view->itemSize().width() < 0) {
 466                     // Use a special rubberband for views that have only one column and
 467                     // expand the rubberband to use the whole width of the view.
 468                     endPos.setX(m_view->size().width());
 469                 }
 470             } else {
 471                 endPos.rx() += m_view->scrollOffset();
 472             }
 473             rubberBand->setEndPosition(endPos);
 474         }
 475     }
 476
 477     return false;
 478 }
 479
 480 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 481 {
 482     if (!m_view) {
 483         return false;
 484     }
 485
 486     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 487     if (isAboveSelectionToggle) {
 488         m_selectionTogglePressed = false;
 489         return true;
 490     }
 491
 492     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 493         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 494         m_selectionTogglePressed = false;
 495         return true;
 496     }
 497
 498     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 499                                        event->modifiers() & Qt::ControlModifier;
 500
 501     bool clearSelection = !shiftOrControlPressed && event->button() != Qt::RightButton;
 502
 503     KItemListRubberBand* rubberBand = m_view->rubberBand();
 504     if (rubberBand->isActive()) {
 505         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 506         rubberBand->setActive(false);
 507         m_oldSelection.clear();
 508         m_view->setAutoScroll(false);
 509
 510         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 511             clearSelection = false;
 512         }
 513     }
 514
 515     const QPointF pos = transform.map(event->pos());
 516     const int index = m_view->itemAt(pos);
 517
 518     if (index >= 0 && index == m_pressedIndex) {
 519         // The release event is done above the same item as the press event
 520
 521         if (clearSelection) {
 522             // Clear the previous selection but reselect the current index
 523             m_selectionManager->setSelectedItems(QSet<int>() << index);
 524         }
 525
 526         if (event->button() & Qt::LeftButton) {
 527             bool emitItemActivated = true;
 528             if (m_view->isAboveExpansionToggle(index, pos)) {
 529                 const bool expanded = m_model->isExpanded(index);
 530                 m_model->setExpanded(index, !expanded);
 531
 532                 emit itemExpansionToggleClicked(index);
 533                 emitItemActivated = false;
 534             } else if (shiftOrControlPressed) {
 535                 // The mouse click should only update the selection, not trigger the item
 536                 emitItemActivated = false;
 537             } else if (!KGlobalSettings::singleClick()) {
 538                 emitItemActivated = false;
 539             }
 540             if (emitItemActivated) {
 541                 emit itemActivated(index);
 542             }
 543         } else if (event->button() & Qt::MidButton) {
 544             emit itemMiddleClicked(index);
 545         }
 546     } else if (clearSelection) {
 547         m_selectionManager->clearSelection();
 548     }
 549
 550     m_pressedMousePos = QPointF();
 551     m_pressedIndex = -1;
 552     return false;
 553 }
 554
 555 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 556 {
 557     const QPointF pos = transform.map(event->pos());
 558     const int index = m_view->itemAt(pos);
 559
 560     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 561                              (event->button() & Qt::LeftButton) &&
 562                              index >= 0 && index < m_model->count();
 563     if (emitItemActivated) {
 564         emit itemActivated(index);
 565     }
 566     return false;
 567 }
 568
 569 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 570 {
 571     Q_UNUSED(event);
 572     Q_UNUSED(transform);
 573     return false;
 574 }
 575
 576 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 577 {
 578     Q_UNUSED(event);
 579     Q_UNUSED(transform);
 580     return false;
 581 }
 582
 583 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 584 {
 585     Q_UNUSED(transform);
 586     if (!m_model || !m_view) {
 587         return false;
 588     }
 589
 590     KItemListWidget* oldHoveredWidget = hoveredWidget();
 591
 592     const QPointF pos = transform.map(event->pos());
 593     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 594
 595     if (oldHoveredWidget != newHoveredWidget) {
 596         m_autoActivationTimer->stop();
 597
 598         if (oldHoveredWidget) {
 599             oldHoveredWidget->setHovered(false);
 600             emit itemUnhovered(oldHoveredWidget->index());
 601         }
 602
 603         if (newHoveredWidget) {
 604             const int index = newHoveredWidget->index();
 605             if (m_model->supportsDropping(index)) {
 606                 newHoveredWidget->setHovered(true);
 607             }
 608             emit itemHovered(index);
 609
 610             if (m_autoActivationTimer->interval() >= 0) {
 611                 m_autoActivationTimer->setProperty("index", index);
 612                 m_autoActivationTimer->start();
 613             }
 614         }
 615     }
 616
 617     return false;
 618 }
 619
 620 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 621 {
 622     Q_UNUSED(transform)
 623     if (!m_view) {
 624         return false;
 625     }
 626
 627     m_autoActivationTimer->stop();
 628
 629     const QPointF pos = transform.map(event->pos());
 630     const int index = m_view->itemAt(pos);
 631     emit itemDropEvent(index, event);
 632
 633     return true;
 634 }
 635
 636 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 637 {
 638     Q_UNUSED(event);
 639     Q_UNUSED(transform);
 640     return false;
 641 }
 642
 643 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 644 {
 645     Q_UNUSED(transform);
 646     if (!m_model || !m_view) {
 647         return false;
 648     }
 649
 650     KItemListWidget* oldHoveredWidget = hoveredWidget();
 651     const QPointF pos = transform.map(event->pos());
 652     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 653
 654     if (oldHoveredWidget != newHoveredWidget) {
 655         if (oldHoveredWidget) {
 656             oldHoveredWidget->setHovered(false);
 657             emit itemUnhovered(oldHoveredWidget->index());
 658         }
 659
 660         if (newHoveredWidget) {
 661             newHoveredWidget->setHovered(true);
 662             emit itemHovered(newHoveredWidget->index());
 663         }
 664     }
 665
 666     return false;
 667 }
 668
 669 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 670 {
 671     Q_UNUSED(event);
 672     Q_UNUSED(transform);
 673
 674     if (!m_model || !m_view) {
 675         return false;
 676     }
 677
 678     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 679         if (widget->isHovered()) {
 680             widget->setHovered(false);
 681             emit itemUnhovered(widget->index());
 682         }
 683     }
 684     return false;
 685 }
 686
 687 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 688 {
 689     Q_UNUSED(event);
 690     Q_UNUSED(transform);
 691     return false;
 692 }
 693
 694 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 695 {
 696     Q_UNUSED(event);
 697     Q_UNUSED(transform);
 698     return false;
 699 }
 700
 701 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 702 {
 703     if (!event) {
 704         return false;
 705     }
 706
 707     switch (event->type()) {
 708     case QEvent::KeyPress:
 709         return keyPressEvent(static_cast<QKeyEvent*>(event));
 710     case QEvent::InputMethod:
 711         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 712     case QEvent::GraphicsSceneMousePress:
 713         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 714     case QEvent::GraphicsSceneMouseMove:
 715         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 716     case QEvent::GraphicsSceneMouseRelease:
 717         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 718     case QEvent::GraphicsSceneMouseDoubleClick:
 719         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 720     case QEvent::GraphicsSceneWheel:
 721          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 722     case QEvent::GraphicsSceneDragEnter:
 723         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 724     case QEvent::GraphicsSceneDragLeave:
 725         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 726     case QEvent::GraphicsSceneDragMove:
 727         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 728     case QEvent::GraphicsSceneDrop:
 729         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 730     case QEvent::GraphicsSceneHoverEnter:
 731         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 732     case QEvent::GraphicsSceneHoverMove:
 733         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 734     case QEvent::GraphicsSceneHoverLeave:
 735         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 736     case QEvent::GraphicsSceneResize:
 737         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 738     default:
 739         break;
 740     }
 741
 742     return false;
 743 }
 744
 745 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 746 {
 747     if (!m_view) {
 748         return;
 749     }
 750
 751     KItemListRubberBand* rubberBand = m_view->rubberBand();
 752     if (rubberBand->isActive()) {
 753         const qreal diff = current - previous;
 754         // TODO: Ideally just QCursor::pos() should be used as
 755         // new end-position but it seems there is no easy way
 756         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 757         // (... or I just missed an easy way to do the mapping)
 758         QPointF endPos = rubberBand->endPosition();
 759         if (m_view->scrollOrientation() == Qt::Vertical) {
 760             endPos.ry() += diff;
 761         } else {
 762             endPos.rx() += diff;
 763         }
 764
 765         rubberBand->setEndPosition(endPos);
 766     }
 767 }
 768
 769 void KItemListController::slotRubberBandChanged()
 770 {
 771     if (!m_view || !m_model || m_model->count() <= 0) {
 772         return;
 773     }
 774
 775     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 776     const QPointF startPos = rubberBand->startPosition();
 777     const QPointF endPos = rubberBand->endPosition();
 778     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 779
 780     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 781     if (scrollVertical) {
 782         rubberBandRect.translate(0, -m_view->scrollOffset());
 783     } else {
 784         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 785     }
 786
 787     if (!m_oldSelection.isEmpty()) {
 788         // Clear the old selection that was available before the rubberband has
 789         // been activated in case if no Shift- or Control-key are pressed
 790         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 791                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 792         if (!shiftOrControlPressed) {
 793             m_oldSelection.clear();
 794         }
 795     }
 796
 797     QSet<int> selectedItems;
 798
 799     // Select all visible items that intersect with the rubberband
 800     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 801         const int index = widget->index();
 802
 803         const QRectF widgetRect = m_view->itemRect(index);
 804         if (widgetRect.intersects(rubberBandRect)) {
 805             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 806             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 807             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 808                 selectedItems.insert(index);
 809             }
 810         }
 811     }
 812
 813     // Select all invisible items that intersect with the rubberband. Instead of
 814     // iterating all items only the area which might be touched by the rubberband
 815     // will be checked.
 816     const bool increaseIndex = scrollVertical ?
 817                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 818
 819     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 820     bool selectionFinished = false;
 821     do {
 822         const QRectF widgetRect = m_view->itemRect(index);
 823         if (widgetRect.intersects(rubberBandRect)) {
 824             selectedItems.insert(index);
 825         }
 826
 827         if (increaseIndex) {
 828             ++index;
 829             selectionFinished = (index >= m_model->count()) ||
 830                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 831                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 832         } else {
 833             --index;
 834             selectionFinished = (index < 0) ||
 835                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 836                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 837         }
 838     } while (!selectionFinished);
 839
 840     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 841         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 842         // Therefore, the new selection contains:
 843         // 1. All previously selected items which are not inside the rubberband, and
 844         // 2. all items inside the rubberband which have not been selected previously.
 845         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 846     }
 847     else {
 848         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 849     }
 850 }
 851
 852 void KItemListController::startDragging()
 853 {
 854     if (!m_view || !m_model) {
 855         return;
 856     }
 857
 858     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 859     if (selectedItems.isEmpty()) {
 860         return;
 861     }
 862
 863     QMimeData* data = m_model->createMimeData(selectedItems);
 864     if (!data) {
 865         return;
 866     }
 867
 868     // The created drag object will be owned and deleted
 869     // by QApplication::activeWindow().
 870     QDrag* drag = new QDrag(QApplication::activeWindow());
 871     drag->setMimeData(data);
 872
 873     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 874     drag->setPixmap(pixmap);
 875
 876     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 877 }
 878
 879 KItemListWidget* KItemListController::hoveredWidget() const
 880 {
 881     Q_ASSERT(m_view);
 882
 883     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 884         if (widget->isHovered()) {
 885             return widget;
 886         }
 887     }
 888
 889     return 0;
 890 }
 891
 892 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 893 {
 894     Q_ASSERT(m_view);
 895
 896     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 897         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 898
 899         const bool hovered = widget->contains(mappedPos) &&
 900                              !widget->expansionToggleRect().contains(mappedPos);
 901         if (hovered) {
 902             return widget;
 903         }
 904     }
 905
 906     return 0;
 907 }
 908
 909 #include "kitemlistcontroller.moc"