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_selectionTogglePressed = true;
 279         m_selectionManager->setCurrentItem(m_pressedIndex);
 280         return true;
 281     }
 282
 283     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 284     if (m_selectionTogglePressed) {
 285         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 286         return true;
 287     }
 288
 289     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 290     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 291
 292     if (m_selectionBehavior == SingleSelection) {
 293         m_selectionManager->clearSelection();
 294     }
 295
 296     if (!shiftPressed) {
 297         // Finish the anchored selection before the current index is changed
 298         m_selectionManager->endAnchoredSelection();
 299     }
 300
 301     if (m_pressedIndex >= 0) {
 302         m_selectionManager->setCurrentItem(m_pressedIndex);
 303
 304         switch (m_selectionBehavior) {
 305         case NoSelection:
 306             break;
 307
 308         case SingleSelection:
 309             m_selectionManager->setSelected(m_pressedIndex);
 310             break;
 311
 312         case MultiSelection:
 313             if (controlPressed) {
 314                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 315                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 316             } else if (event->buttons() & Qt::RightButton) {
 317                 // Only clear the selection if a context menu is requested above a non-selected item
 318                 if (!m_selectionManager->selectedItems().contains(m_pressedIndex)) {
 319                     m_selectionManager->setSelectedItems(QSet<int>() << m_pressedIndex);
 320                 }
 321             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 322                 // Select the pressed item and start a new anchored selection
 323                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 324                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 325             }
 326             break;
 327
 328         default:
 329             Q_ASSERT(false);
 330             break;
 331         }
 332
 333         if (event->buttons() & Qt::RightButton) {
 334             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 335         }
 336
 337         return true;
 338     }
 339
 340     if (event->buttons() & Qt::RightButton) {
 341         m_selectionManager->clearSelection();
 342
 343         const QRectF headerBounds = m_view->headerBoundaries();
 344         if (headerBounds.contains(event->pos())) {
 345             emit headerContextMenuRequested(event->screenPos());
 346         } else {
 347             emit viewContextMenuRequested(event->screenPos());
 348         }
 349         return true;
 350     }
 351
 352     KItemListRubberBand* rubberBand = m_view->rubberBand();
 353     QPointF startPos = m_pressedMousePos;
 354     if (m_view->scrollOrientation() == Qt::Vertical) {
 355         startPos.ry() += m_view->scrollOffset();
 356         if (m_view->itemSize().width() < 0) {
 357             // Use a special rubberband for views that have only one column and
 358             // expand the rubberband to use the whole width of the view.
 359             startPos.setX(0);
 360         }
 361     } else {
 362         startPos.rx() += m_view->scrollOffset();
 363     }
 364
 365     m_oldSelection = m_selectionManager->selectedItems();
 366     rubberBand->setStartPosition(startPos);
 367     rubberBand->setEndPosition(startPos);
 368     rubberBand->setActive(true);
 369     connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 370     m_view->setAutoScroll(true);
 371
 372     return false;
 373 }
 374
 375 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 376 {
 377     if (!m_view) {
 378         return false;
 379     }
 380
 381     if (m_pressedIndex >= 0) {
 382         // Check whether a dragging should be started
 383         if (event->buttons() & Qt::LeftButton) {
 384             const QPointF pos = transform.map(event->pos());
 385             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 386                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 387                     // Always assure that the dragged item gets selected. Usually this is already
 388                     // done on the mouse-press event, but when using the selection-toggle on a
 389                     // selected item the dragged item is not selected yet.
 390                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 391                 }
 392                 startDragging();
 393             }
 394         }
 395     } else {
 396         KItemListRubberBand* rubberBand = m_view->rubberBand();
 397         if (rubberBand->isActive()) {
 398             QPointF endPos = transform.map(event->pos());
 399             if (m_view->scrollOrientation() == Qt::Vertical) {
 400                 endPos.ry() += m_view->scrollOffset();
 401                 if (m_view->itemSize().width() < 0) {
 402                     // Use a special rubberband for views that have only one column and
 403                     // expand the rubberband to use the whole width of the view.
 404                     endPos.setX(m_view->size().width());
 405                 }
 406             } else {
 407                 endPos.rx() += m_view->scrollOffset();
 408             }
 409             rubberBand->setEndPosition(endPos);
 410         }
 411     }
 412
 413     return false;
 414 }
 415
 416 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 417 {
 418     if (!m_view) {
 419         return false;
 420     }
 421
 422     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 423     if (isAboveSelectionToggle) {
 424         m_selectionTogglePressed = false;
 425         return true;
 426     }
 427
 428     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 429         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 430         m_selectionTogglePressed = false;
 431         return true;
 432     }
 433
 434     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 435                                        event->modifiers() & Qt::ControlModifier;
 436
 437     bool clearSelection = !shiftOrControlPressed && event->button() != Qt::RightButton;
 438
 439     KItemListRubberBand* rubberBand = m_view->rubberBand();
 440     if (rubberBand->isActive()) {
 441         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 442         rubberBand->setActive(false);
 443         m_oldSelection.clear();
 444         m_view->setAutoScroll(false);
 445
 446         if (rubberBand->startPosition() != rubberBand->endPosition()) {
 447             clearSelection = false;
 448         }
 449     }
 450
 451     const QPointF pos = transform.map(event->pos());
 452     const int index = m_view->itemAt(pos);
 453
 454     if (index >= 0 && index == m_pressedIndex) {
 455         // The release event is done above the same item as the press event
 456
 457         if (clearSelection) {
 458             // Clear the previous selection but reselect the current index
 459             m_selectionManager->setSelectedItems(QSet<int>() << index);
 460         }
 461
 462         if (event->button() & Qt::LeftButton) {
 463             bool emitItemActivated = true;
 464             if (m_view->isAboveExpansionToggle(index, pos)) {
 465                 emit itemExpansionToggleClicked(index);
 466                 emitItemActivated = false;
 467             } else if (shiftOrControlPressed) {
 468                 // The mouse click should only update the selection, not trigger the item
 469                 emitItemActivated = false;
 470             } else if (!KGlobalSettings::singleClick()) {
 471                 emitItemActivated = false;
 472             }
 473             if (emitItemActivated) {
 474                 emit itemActivated(index);
 475             }
 476         } else if (event->button() & Qt::MidButton) {
 477             emit itemMiddleClicked(index);
 478         }
 479     } else if (clearSelection) {
 480         m_selectionManager->clearSelection();
 481     }
 482
 483     m_pressedMousePos = QPointF();
 484     m_pressedIndex = -1;
 485     return false;
 486 }
 487
 488 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 489 {
 490     const QPointF pos = transform.map(event->pos());
 491     const int index = m_view->itemAt(pos);
 492
 493     bool emitItemActivated = !KGlobalSettings::singleClick() &&
 494                              (event->button() & Qt::LeftButton) &&
 495                              index >= 0 && index < m_model->count();
 496     if (emitItemActivated) {
 497         emit itemActivated(index);
 498     }
 499     return false;
 500 }
 501
 502 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 503 {
 504     Q_UNUSED(event);
 505     Q_UNUSED(transform);
 506     return false;
 507 }
 508
 509 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 510 {
 511     Q_UNUSED(event);
 512     Q_UNUSED(transform);
 513     return false;
 514 }
 515
 516 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 517 {
 518     Q_UNUSED(transform);
 519     if (!m_model || !m_view) {
 520         return false;
 521     }
 522
 523     KItemListWidget* oldHoveredWidget = hoveredWidget();
 524     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 525     if (oldHoveredWidget != newHoveredWidget) {
 526         if (oldHoveredWidget) {
 527             oldHoveredWidget->setHovered(false);
 528             emit itemUnhovered(oldHoveredWidget->index());
 529         }
 530
 531         if (newHoveredWidget) {
 532             const int index = newHoveredWidget->index();
 533             if (m_model->supportsDropping(index)) {
 534                 newHoveredWidget->setHovered(true);
 535             }
 536             emit itemHovered(index);
 537         }
 538     }
 539
 540     return false;
 541 }
 542
 543 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 544 {
 545     Q_UNUSED(transform)
 546     if (!m_view) {
 547         return false;
 548     }
 549
 550     const QPointF pos = transform.map(event->pos());
 551     const int index = m_view->itemAt(pos);
 552     emit itemDropEvent(index, event);
 553
 554     return true;
 555 }
 556
 557 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 558 {
 559     Q_UNUSED(event);
 560     Q_UNUSED(transform);
 561     return false;
 562 }
 563
 564 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 565 {
 566     Q_UNUSED(transform);
 567     if (!m_model || !m_view) {
 568         return false;
 569     }
 570
 571     KItemListWidget* oldHoveredWidget = hoveredWidget();
 572     KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
 573     if (oldHoveredWidget != newHoveredWidget) {
 574         if (oldHoveredWidget) {
 575             oldHoveredWidget->setHovered(false);
 576             emit itemUnhovered(oldHoveredWidget->index());
 577         }
 578
 579         if (newHoveredWidget) {
 580             newHoveredWidget->setHovered(true);
 581             emit itemHovered(newHoveredWidget->index());
 582         }
 583     }
 584
 585     return false;
 586 }
 587
 588 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 589 {
 590     Q_UNUSED(event);
 591     Q_UNUSED(transform);
 592
 593     if (!m_model || !m_view) {
 594         return false;
 595     }
 596
 597     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 598         if (widget->isHovered()) {
 599             widget->setHovered(false);
 600             emit itemUnhovered(widget->index());
 601         }
 602     }
 603     return false;
 604 }
 605
 606 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 607 {
 608     Q_UNUSED(event);
 609     Q_UNUSED(transform);
 610     return false;
 611 }
 612
 613 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 614 {
 615     Q_UNUSED(event);
 616     Q_UNUSED(transform);
 617     return false;
 618 }
 619
 620 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 621 {
 622     if (!event) {
 623         return false;
 624     }
 625
 626     switch (event->type()) {
 627     case QEvent::KeyPress:
 628         return keyPressEvent(static_cast<QKeyEvent*>(event));
 629     case QEvent::InputMethod:
 630         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 631     case QEvent::GraphicsSceneMousePress:
 632         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 633     case QEvent::GraphicsSceneMouseMove:
 634         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 635     case QEvent::GraphicsSceneMouseRelease:
 636         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 637     case QEvent::GraphicsSceneMouseDoubleClick:
 638         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 639     case QEvent::GraphicsSceneWheel:
 640          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 641     case QEvent::GraphicsSceneDragEnter:
 642         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 643     case QEvent::GraphicsSceneDragLeave:
 644         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 645     case QEvent::GraphicsSceneDragMove:
 646         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 647     case QEvent::GraphicsSceneDrop:
 648         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 649     case QEvent::GraphicsSceneHoverEnter:
 650         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 651     case QEvent::GraphicsSceneHoverMove:
 652         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 653     case QEvent::GraphicsSceneHoverLeave:
 654         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 655     case QEvent::GraphicsSceneResize:
 656         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 657     default:
 658         break;
 659     }
 660
 661     return false;
 662 }
 663
 664 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 665 {
 666     if (!m_view) {
 667         return;
 668     }
 669
 670     KItemListRubberBand* rubberBand = m_view->rubberBand();
 671     if (rubberBand->isActive()) {
 672         const qreal diff = current - previous;
 673         // TODO: Ideally just QCursor::pos() should be used as
 674         // new end-position but it seems there is no easy way
 675         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 676         // (... or I just missed an easy way to do the mapping)
 677         QPointF endPos = rubberBand->endPosition();
 678         if (m_view->scrollOrientation() == Qt::Vertical) {
 679             endPos.ry() += diff;
 680         } else {
 681             endPos.rx() += diff;
 682         }
 683
 684         rubberBand->setEndPosition(endPos);
 685     }
 686 }
 687
 688 void KItemListController::slotRubberBandChanged()
 689 {
 690     if (!m_view || !m_model || m_model->count() <= 0) {
 691         return;
 692     }
 693
 694     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 695     const QPointF startPos = rubberBand->startPosition();
 696     const QPointF endPos = rubberBand->endPosition();
 697     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 698
 699     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 700     if (scrollVertical) {
 701         rubberBandRect.translate(0, -m_view->scrollOffset());
 702     } else {
 703         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 704     }
 705
 706     if (!m_oldSelection.isEmpty()) {
 707         // Clear the old selection that was available before the rubberband has
 708         // been activated in case if no Shift- or Control-key are pressed
 709         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 710                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 711         if (!shiftOrControlPressed) {
 712             m_oldSelection.clear();
 713         }
 714     }
 715
 716     QSet<int> selectedItems;
 717
 718     // Select all visible items that intersect with the rubberband
 719     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 720         const int index = widget->index();
 721
 722         const QRectF widgetRect = m_view->itemRect(index);
 723         if (widgetRect.intersects(rubberBandRect)) {
 724             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 725             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 726             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 727                 selectedItems.insert(index);
 728             }
 729         }
 730     }
 731
 732     // Select all invisible items that intersect with the rubberband. Instead of
 733     // iterating all items only the area which might be touched by the rubberband
 734     // will be checked.
 735     const bool increaseIndex = scrollVertical ?
 736                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 737
 738     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 739     bool selectionFinished = false;
 740     do {
 741         const QRectF widgetRect = m_view->itemRect(index);
 742         if (widgetRect.intersects(rubberBandRect)) {
 743             selectedItems.insert(index);
 744         }
 745
 746         if (increaseIndex) {
 747             ++index;
 748             selectionFinished = (index >= m_model->count()) ||
 749                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 750                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 751         } else {
 752             --index;
 753             selectionFinished = (index < 0) ||
 754                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 755                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 756         }
 757     } while (!selectionFinished);
 758
 759     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 760         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 761         // Therefore, the new selection contains:
 762         // 1. All previously selected items which are not inside the rubberband, and
 763         // 2. all items inside the rubberband which have not been selected previously.
 764         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 765     }
 766     else {
 767         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 768     }
 769 }
 770
 771 void KItemListController::startDragging()
 772 {
 773     if (!m_view || !m_model) {
 774         return;
 775     }
 776
 777     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 778     if (selectedItems.isEmpty()) {
 779         return;
 780     }
 781
 782     QMimeData* data = m_model->createMimeData(selectedItems);
 783     if (!data) {
 784         return;
 785     }
 786
 787     // The created drag object will be owned and deleted
 788     // by QApplication::activeWindow().
 789     QDrag* drag = new QDrag(QApplication::activeWindow());
 790     drag->setMimeData(data);
 791
 792     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 793     drag->setPixmap(pixmap);
 794
 795     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::IgnoreAction);
 796 }
 797
 798 KItemListWidget* KItemListController::hoveredWidget() const
 799 {
 800     Q_ASSERT(m_view);
 801
 802     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 803         if (widget->isHovered()) {
 804             return widget;
 805         }
 806     }
 807
 808     return 0;
 809 }
 810
 811 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 812 {
 813     Q_ASSERT(m_view);
 814
 815     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 816         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 817
 818         const bool hovered = widget->contains(mappedPos) &&
 819                              !widget->expansionToggleRect().contains(mappedPos);
 820         if (hovered) {
 821             return widget;
 822         }
 823     }
 824
 825     return 0;
 826 }
 827
 828 #include "kitemlistcontroller.moc"