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