src/kitemviews/kitemlistcontroller.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   Based on the Itemviews NG project from Trolltech Labs:                *
   5  *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program; if not, write to the                         *
  19  *   Free Software Foundation, Inc.,                                       *
  20  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  21  ***************************************************************************/
  22
  23 #include "kitemlistcontroller.h"
  24
  25 #include "kitemlistview.h"
  26 #include "kitemlistrubberband_p.h"
  27 #include "kitemlistselectionmanager.h"
  28 #include "kitemlistkeyboardsearchmanager_p.h"
  29
  30 #include <QApplication>
  31 #include <QDrag>
  32 #include <QEvent>
  33 #include <QGraphicsScene>
  34 #include <QGraphicsSceneEvent>
  35 #include <QGraphicsView>
  36 #include <QMimeData>
  37 #include <QTimer>
  38
  39 #include <KGlobalSettings>
  40 #include <KDebug>
  41
  42 KItemListController::KItemListController(QObject* parent) :
  43     QObject(parent),
  44     m_singleClickActivation(KGlobalSettings::singleClick()),
  45     m_selectionTogglePressed(false),
  46     m_clearSelectionIfItemsAreNotDragged(false),
  47     m_selectionBehavior(NoSelection),
  48     m_model(0),
  49     m_view(0),
  50     m_selectionManager(new KItemListSelectionManager(this)),
  51     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  52     m_pressedIndex(-1),
  53     m_pressedMousePos(),
  54     m_autoActivationTimer(0),
  55     m_oldSelection(),
  56     m_keyboardAnchorIndex(-1),
  57     m_keyboardAnchorPos(0)
  58 {
  59     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
  60             this, SLOT(slotChangeCurrentItem(QString,bool)));
  61
  62     m_autoActivationTimer = new QTimer(this);
  63     m_autoActivationTimer->setSingleShot(true);
  64     m_autoActivationTimer->setInterval(-1);
  65     connect(m_autoActivationTimer, SIGNAL(timeout()), this, SLOT(slotAutoActivationTimeout()));
  66 }
  67
  68 KItemListController::~KItemListController()
  69 {
  70 }
  71
  72 void KItemListController::setModel(KItemModelBase* model)
  73 {
  74     if (m_model == model) {
  75         return;
  76     }
  77
  78     KItemModelBase* oldModel = m_model;
  79     m_model = model;
  80
  81     if (m_view) {
  82         m_view->setModel(m_model);
  83     }
  84
  85     m_selectionManager->setModel(m_model);
  86
  87     emit modelChanged(m_model, oldModel);
  88 }
  89
  90 KItemModelBase* KItemListController::model() const
  91 {
  92     return m_model;
  93 }
  94
  95 KItemListSelectionManager* KItemListController::selectionManager() const
  96 {
  97     return m_selectionManager;
  98 }
  99
 100 void KItemListController::setView(KItemListView* view)
 101 {
 102     if (m_view == view) {
 103         return;
 104     }
 105
 106     KItemListView* oldView = m_view;
 107     if (oldView) {
 108         disconnect(oldView, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 109     }
 110
 111     m_view = view;
 112
 113     if (m_view) {
 114         m_view->setController(this);
 115         m_view->setModel(m_model);
 116         connect(m_view, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 117     }
 118
 119     emit viewChanged(m_view, oldView);
 120 }
 121
 122 KItemListView* KItemListController::view() const
 123 {
 124     return m_view;
 125 }
 126
 127 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 128 {
 129     m_selectionBehavior = behavior;
 130 }
 131
 132 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 133 {
 134     return m_selectionBehavior;
 135 }
 136
 137 void KItemListController::setAutoActivationDelay(int delay)
 138 {
 139     m_autoActivationTimer->setInterval(delay);
 140 }
 141
 142 int KItemListController::autoActivationDelay() const
 143 {
 144     return m_autoActivationTimer->interval();
 145 }
 146
 147 void KItemListController::setSingleClickActivation(bool singleClick)
 148 {
 149     m_singleClickActivation = singleClick;
 150 }
 151
 152 bool KItemListController::singleClickActivation() const
 153 {
 154     return m_singleClickActivation;
 155 }
 156
 157 bool KItemListController::showEvent(QShowEvent* event)
 158 {
 159     Q_UNUSED(event);
 160     return false;
 161 }
 162
 163 bool KItemListController::hideEvent(QHideEvent* event)
 164 {
 165     Q_UNUSED(event);
 166     return false;
 167 }
 168
 169 bool KItemListController::keyPressEvent(QKeyEvent* event)
 170 {
 171     int index = m_selectionManager->currentItem();
 172     int key = event->key();
 173
 174     // Handle the expanding/collapsing of items
 175     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 176         if (key == Qt::Key_Right) {
 177             if (m_model->setExpanded(index, true)) {
 178                 return true;
 179             }
 180         } else if (key == Qt::Key_Left) {
 181             if (m_model->setExpanded(index, false)) {
 182                 return true;
 183             }
 184         }
 185     }
 186
 187     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 188     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 189     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 190
 191     const int itemCount = m_model->count();
 192
 193     // For horizontal scroll orientation, transform
 194     // the arrow keys to simplify the event handling.
 195     if (m_view->scrollOrientation() == Qt::Horizontal) {
 196         switch (key) {
 197         case Qt::Key_Up:    key = Qt::Key_Left; break;
 198         case Qt::Key_Down:  key = Qt::Key_Right; break;
 199         case Qt::Key_Left:  key = Qt::Key_Up; break;
 200         case Qt::Key_Right: key = Qt::Key_Down; break;
 201         default:            break;
 202         }
 203     }
 204
 205     const bool selectSingleItem = itemCount == 1 &&
 206                                   (key == Qt::Key_Home || key == Qt::Key_End  ||
 207                                    key == Qt::Key_Up   || key == Qt::Key_Down ||
 208                                    key == Qt::Key_Left || key == Qt::Key_Right);
 209     if (selectSingleItem) {
 210         const int current = m_selectionManager->currentItem();
 211         m_selectionManager->setSelected(current);
 212         return true;
 213     }
 214
 215     switch (key) {
 216     case Qt::Key_Home:
 217         index = 0;
 218         break;
 219
 220     case Qt::Key_End:
 221         index = itemCount - 1;
 222         break;
 223
 224     case Qt::Key_Left:
 225         if (index > 0) {
 226             --index;
 227             m_keyboardAnchorIndex = index;
 228             m_keyboardAnchorPos = keyboardAnchorPos(index);
 229         }
 230         break;
 231
 232     case Qt::Key_Right:
 233         if (index < itemCount - 1) {
 234             ++index;
 235             m_keyboardAnchorIndex = index;
 236             m_keyboardAnchorPos = keyboardAnchorPos(index);
 237         }
 238         break;
 239
 240     case Qt::Key_Up:
 241         updateKeyboardAnchor();
 242         index = previousRowIndex();
 243         break;
 244
 245     case Qt::Key_Down:
 246         updateKeyboardAnchor();
 247         index = nextRowIndex();
 248         break;
 249
 250     case Qt::Key_Enter:
 251     case Qt::Key_Return: {
 252         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 253         if (selectedItems.count() >= 2) {
 254             emit itemsActivated(selectedItems);
 255         } else if (selectedItems.count() == 1) {
 256             emit itemActivated(selectedItems.toList().first());
 257         } else {
 258             emit itemActivated(index);
 259         }
 260         break;
 261     }
 262
 263     case Qt::Key_Space:
 264         if (controlPressed) {
 265             m_selectionManager->endAnchoredSelection();
 266             m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 267             m_selectionManager->beginAnchoredSelection(index);
 268         } else {
 269             const int current = m_selectionManager->currentItem();
 270             m_selectionManager->setSelected(current);
 271         }
 272         break;
 273
 274     case Qt::Key_Menu: {
 275         // Emit the signal itemContextMenuRequested() in case if at least one
 276         // item is selected. Otherwise the signal viewContextMenuRequested() will be emitted.
 277         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 278         int index = -1;
 279         if (selectedItems.count() >= 2) {
 280             const int currentItemIndex = m_selectionManager->currentItem();
 281             index = selectedItems.contains(currentItemIndex)
 282                     ? currentItemIndex : selectedItems.toList().first();
 283         } else if (selectedItems.count() == 1) {
 284             index = selectedItems.toList().first();
 285         }
 286
 287         if (index >= 0) {
 288             const QRectF contextRect = m_view->itemContextRect(index);
 289             const QPointF pos(m_view->scene()->views().first()->mapToGlobal(contextRect.bottomRight().toPoint()));
 290             emit itemContextMenuRequested(index, pos);
 291         } else {
 292             emit viewContextMenuRequested(QCursor::pos());
 293         }
 294         break;
 295     }
 296
 297     default:
 298         m_keyboardManager->addKeys(event->text());
 299         return false;
 300     }
 301
 302     if (m_selectionManager->currentItem() != index) {
 303         if (controlPressed) {
 304             m_selectionManager->endAnchoredSelection();
 305         }
 306
 307         m_selectionManager->setCurrentItem(index);
 308
 309         if (!shiftOrControlPressed || m_selectionBehavior == SingleSelection) {
 310             m_selectionManager->clearSelection();
 311             m_selectionManager->setSelected(index, 1);
 312         }
 313
 314         if (!shiftPressed) {
 315             m_selectionManager->beginAnchoredSelection(index);
 316         }
 317
 318         m_view->scrollToItem(index);
 319     }
 320     return true;
 321 }
 322
 323 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 324 {
 325     if (!m_model || m_model->count() == 0) {
 326         return;
 327     }
 328     const int currentIndex = m_selectionManager->currentItem();
 329     int index;
 330     if (searchFromNextItem) {
 331         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 332     } else {
 333         index = m_model->indexForKeyboardSearch(text, currentIndex);
 334     }
 335     if (index >= 0) {
 336         m_selectionManager->setCurrentItem(index);
 337         m_selectionManager->clearSelection();
 338         m_selectionManager->setSelected(index, 1);
 339         m_selectionManager->beginAnchoredSelection(index);
 340         m_view->scrollToItem(index);
 341     }
 342 }
 343
 344 void KItemListController::slotAutoActivationTimeout()
 345 {
 346     if (!m_model || !m_view) {
 347         return;
 348     }
 349
 350     const int index = m_autoActivationTimer->property("index").toInt();
 351     if (index < 0 || index >= m_model->count()) {
 352         return;
 353     }
 354
 355     if (m_model->supportsDropping(index)) {
 356         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 357             const bool expanded = m_model->isExpanded(index);
 358             m_model->setExpanded(index, !expanded);
 359         } else {
 360             emit itemActivated(index);
 361         }
 362     }
 363 }
 364
 365 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 366 {
 367     Q_UNUSED(event);
 368     return false;
 369 }
 370
 371 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 372 {
 373     if (!m_view) {
 374         return false;
 375     }
 376
 377     m_pressedMousePos = transform.map(event->pos());
 378     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 379     if (m_pressedIndex >= 0) {
 380         emit itemPressed(m_pressedIndex, event->button());
 381     }
 382
 383     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 384         m_selectionManager->endAnchoredSelection();
 385         m_selectionManager->setCurrentItem(m_pressedIndex);
 386         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 387         return true;
 388     }
 389
 390     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 391     if (m_selectionTogglePressed) {
 392         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 393         // The previous anchored selection has been finished already in
 394         // KItemListSelectionManager::setSelected(). We can safely change
 395         // the current item and start a new anchored selection now.
 396         m_selectionManager->setCurrentItem(m_pressedIndex);
 397         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 398         return true;
 399     }
 400
 401     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 402     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 403
 404     // The previous selection is cleared if either
 405     // 1. The selection mode is SingleSelection, or
 406     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 407     //    a) Shift or Control are pressed.
 408     //    b) The clicked item is selected already. In that case, the user might want to:
 409     //       - start dragging multiple items, or
 410     //       - open the context menu and perform an action for all selected items.
 411     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 412     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 413     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 414                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 415     if (clearSelection) {
 416         m_selectionManager->clearSelection();
 417     } else if (pressedItemAlreadySelected && (event->buttons() & Qt::LeftButton)) {
 418         // The user might want to start dragging multiple items, but if he clicks the item
 419         // in order to trigger it instead, the other selected items must be deselected.
 420         // However, we do not know yet what the user is going to do.
 421         // -> remember that the user pressed an item which had been selected already and
 422         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
 423         m_clearSelectionIfItemsAreNotDragged = true;
 424     }
 425
 426     if (!shiftPressed) {
 427         // Finish the anchored selection before the current index is changed
 428         m_selectionManager->endAnchoredSelection();
 429     }
 430
 431     if (m_pressedIndex >= 0) {
 432         m_selectionManager->setCurrentItem(m_pressedIndex);
 433
 434         switch (m_selectionBehavior) {
 435         case NoSelection:
 436             break;
 437
 438         case SingleSelection:
 439             m_selectionManager->setSelected(m_pressedIndex);
 440             break;
 441
 442         case MultiSelection:
 443             if (controlPressed) {
 444                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 445                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 446             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 447                 // Select the pressed item and start a new anchored selection
 448                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 449                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 450             }
 451             break;
 452
 453         default:
 454             Q_ASSERT(false);
 455             break;
 456         }
 457
 458         if (event->buttons() & Qt::RightButton) {
 459             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 460         }
 461
 462         return true;
 463     }
 464
 465     if (event->buttons() & Qt::RightButton) {
 466         const QRectF headerBounds = m_view->headerBoundaries();
 467         if (headerBounds.contains(event->pos())) {
 468             emit headerContextMenuRequested(event->screenPos());
 469         } else {
 470             emit viewContextMenuRequested(event->screenPos());
 471         }
 472         return true;
 473     }
 474
 475     if (m_selectionBehavior == MultiSelection) {
 476         QPointF startPos = m_pressedMousePos;
 477         if (m_view->scrollOrientation() == Qt::Vertical) {
 478             startPos.ry() += m_view->scrollOffset();
 479             if (m_view->itemSize().width() < 0) {
 480                 // Use a special rubberband for views that have only one column and
 481                 // expand the rubberband to use the whole width of the view.
 482                 startPos.setX(0);
 483             }
 484         } else {
 485             startPos.rx() += m_view->scrollOffset();
 486         }
 487
 488         m_oldSelection = m_selectionManager->selectedItems();
 489         KItemListRubberBand* rubberBand = m_view->rubberBand();
 490         rubberBand->setStartPosition(startPos);
 491         rubberBand->setEndPosition(startPos);
 492         rubberBand->setActive(true);
 493         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 494         m_view->setAutoScroll(true);
 495     }
 496
 497     return false;
 498 }
 499
 500 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 501 {
 502     if (!m_view) {
 503         return false;
 504     }
 505
 506     if (m_pressedIndex >= 0) {
 507         // Check whether a dragging should be started
 508         if (event->buttons() & Qt::LeftButton) {
 509             const QPointF pos = transform.map(event->pos());
 510             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 511                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 512                     // Always assure that the dragged item gets selected. Usually this is already
 513                     // done on the mouse-press event, but when using the selection-toggle on a
 514                     // selected item the dragged item is not selected yet.
 515                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 516                 } else {
 517                     // A selected item has been clicked to drag all selected items
 518                     // -> the selection should not be cleared when the mouse button is released.
 519                     m_clearSelectionIfItemsAreNotDragged = false;
 520                 }
 521
 522                 startDragging();
 523             }
 524         }
 525     } else {
 526         KItemListRubberBand* rubberBand = m_view->rubberBand();
 527         if (rubberBand->isActive()) {
 528             QPointF endPos = transform.map(event->pos());
 529
 530             // Update the current item.
 531             const int newCurrent = m_view->itemAt(endPos);
 532             if (newCurrent >= 0) {
 533                 // It's expected that the new current index is also the new anchor (bug 163451).
 534                 m_selectionManager->endAnchoredSelection();
 535                 m_selectionManager->setCurrentItem(newCurrent);
 536                 m_selectionManager->beginAnchoredSelection(newCurrent);
 537             }
 538
 539             if (m_view->scrollOrientation() == Qt::Vertical) {
 540                 endPos.ry() += m_view->scrollOffset();
 541                 if (m_view->itemSize().width() < 0) {
 542                     // Use a special rubberband for views that have only one column and
 543                     // expand the rubberband to use the whole width of the view.
 544                     endPos.setX(m_view->size().width());
 545                 }
 546             } else {
 547                 endPos.rx() += m_view->scrollOffset();
 548             }
 549             rubberBand->setEndPosition(endPos);
 550         }
 551     }
 552
 553     return false;
 554 }
 555
 556 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 557 {
 558     if (!m_view) {
 559         return false;
 560     }
 561
 562     if (m_pressedIndex >= 0) {
 563         emit itemReleased(m_pressedIndex, event->button());
 564     }
 565
 566     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 567     if (isAboveSelectionToggle) {
 568         m_selectionTogglePressed = false;
 569         return true;
 570     }
 571
 572     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 573         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 574         m_selectionTogglePressed = false;
 575         return true;
 576     }
 577
 578     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 579                                        event->modifiers() & Qt::ControlModifier;
 580
 581     KItemListRubberBand* rubberBand = m_view->rubberBand();
 582     if (rubberBand->isActive()) {
 583         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 584         rubberBand->setActive(false);
 585         m_oldSelection.clear();
 586         m_view->setAutoScroll(false);
 587     }
 588
 589     const QPointF pos = transform.map(event->pos());
 590     const int index = m_view->itemAt(pos);
 591
 592     if (index >= 0 && index == m_pressedIndex) {
 593         // The release event is done above the same item as the press event
 594
 595         if (m_clearSelectionIfItemsAreNotDragged) {
 596             // A selected item has been clicked, but no drag operation has been started
 597             // -> clear the rest of the selection.
 598             m_selectionManager->clearSelection();
 599             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 600             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 601         }
 602
 603         if (event->button() & Qt::LeftButton) {
 604             bool emitItemActivated = true;
 605             if (m_view->isAboveExpansionToggle(index, pos)) {
 606                 const bool expanded = m_model->isExpanded(index);
 607                 m_model->setExpanded(index, !expanded);
 608
 609                 emit itemExpansionToggleClicked(index);
 610                 emitItemActivated = false;
 611             } else if (shiftOrControlPressed) {
 612                 // The mouse click should only update the selection, not trigger the item
 613                 emitItemActivated = false;
 614             } else if (!m_singleClickActivation) {
 615                 emitItemActivated = false;
 616             }
 617             if (emitItemActivated) {
 618                 emit itemActivated(index);
 619             }
 620         } else if (event->button() & Qt::MidButton) {
 621             emit itemMiddleClicked(index);
 622         }
 623     }
 624
 625     m_pressedMousePos = QPointF();
 626     m_pressedIndex = -1;
 627     m_clearSelectionIfItemsAreNotDragged = false;
 628     return false;
 629 }
 630
 631 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 632 {
 633     const QPointF pos = transform.map(event->pos());
 634     const int index = m_view->itemAt(pos);
 635
 636     bool emitItemActivated = !m_singleClickActivation &&
 637                              (event->button() & Qt::LeftButton) &&
 638                              index >= 0 && index < m_model->count();
 639     if (emitItemActivated) {
 640         emit itemActivated(index);
 641     }
 642     return false;
 643 }
 644
 645 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 646 {
 647     Q_UNUSED(event);
 648     Q_UNUSED(transform);
 649     return false;
 650 }
 651
 652 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 653 {
 654     Q_UNUSED(event);
 655     Q_UNUSED(transform);
 656     return false;
 657 }
 658
 659 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 660 {
 661     Q_UNUSED(transform);
 662     if (!m_model || !m_view) {
 663         return false;
 664     }
 665
 666     KItemListWidget* oldHoveredWidget = hoveredWidget();
 667
 668     const QPointF pos = transform.map(event->pos());
 669     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 670
 671     if (oldHoveredWidget != newHoveredWidget) {
 672         m_autoActivationTimer->stop();
 673
 674         if (oldHoveredWidget) {
 675             oldHoveredWidget->setHovered(false);
 676             emit itemUnhovered(oldHoveredWidget->index());
 677         }
 678
 679         if (newHoveredWidget) {
 680             const int index = newHoveredWidget->index();
 681             if (m_model->supportsDropping(index)) {
 682                 newHoveredWidget->setHovered(true);
 683             }
 684             emit itemHovered(index);
 685
 686             if (m_autoActivationTimer->interval() >= 0) {
 687                 m_autoActivationTimer->setProperty("index", index);
 688                 m_autoActivationTimer->start();
 689             }
 690         }
 691     }
 692
 693     return false;
 694 }
 695
 696 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 697 {
 698     Q_UNUSED(transform)
 699     if (!m_view) {
 700         return false;
 701     }
 702
 703     m_autoActivationTimer->stop();
 704
 705     const QPointF pos = transform.map(event->pos());
 706     const int index = m_view->itemAt(pos);
 707     emit itemDropEvent(index, event);
 708
 709     return true;
 710 }
 711
 712 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 713 {
 714     Q_UNUSED(event);
 715     Q_UNUSED(transform);
 716     return false;
 717 }
 718
 719 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 720 {
 721     Q_UNUSED(transform);
 722     if (!m_model || !m_view) {
 723         return false;
 724     }
 725
 726     KItemListWidget* oldHoveredWidget = hoveredWidget();
 727     const QPointF pos = transform.map(event->pos());
 728     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 729
 730     if (oldHoveredWidget != newHoveredWidget) {
 731         if (oldHoveredWidget) {
 732             oldHoveredWidget->setHovered(false);
 733             emit itemUnhovered(oldHoveredWidget->index());
 734         }
 735
 736         if (newHoveredWidget) {
 737             newHoveredWidget->setHovered(true);
 738             emit itemHovered(newHoveredWidget->index());
 739         }
 740     }
 741
 742     return false;
 743 }
 744
 745 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 746 {
 747     Q_UNUSED(event);
 748     Q_UNUSED(transform);
 749
 750     if (!m_model || !m_view) {
 751         return false;
 752     }
 753
 754     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 755         if (widget->isHovered()) {
 756             widget->setHovered(false);
 757             emit itemUnhovered(widget->index());
 758         }
 759     }
 760     return false;
 761 }
 762
 763 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 764 {
 765     Q_UNUSED(event);
 766     Q_UNUSED(transform);
 767     return false;
 768 }
 769
 770 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 771 {
 772     Q_UNUSED(event);
 773     Q_UNUSED(transform);
 774     return false;
 775 }
 776
 777 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 778 {
 779     if (!event) {
 780         return false;
 781     }
 782
 783     switch (event->type()) {
 784     case QEvent::KeyPress:
 785         return keyPressEvent(static_cast<QKeyEvent*>(event));
 786     case QEvent::InputMethod:
 787         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 788     case QEvent::GraphicsSceneMousePress:
 789         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 790     case QEvent::GraphicsSceneMouseMove:
 791         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 792     case QEvent::GraphicsSceneMouseRelease:
 793         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 794     case QEvent::GraphicsSceneMouseDoubleClick:
 795         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 796     case QEvent::GraphicsSceneWheel:
 797          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 798     case QEvent::GraphicsSceneDragEnter:
 799         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 800     case QEvent::GraphicsSceneDragLeave:
 801         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 802     case QEvent::GraphicsSceneDragMove:
 803         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 804     case QEvent::GraphicsSceneDrop:
 805         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 806     case QEvent::GraphicsSceneHoverEnter:
 807         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 808     case QEvent::GraphicsSceneHoverMove:
 809         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 810     case QEvent::GraphicsSceneHoverLeave:
 811         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 812     case QEvent::GraphicsSceneResize:
 813         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 814     default:
 815         break;
 816     }
 817
 818     return false;
 819 }
 820
 821 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 822 {
 823     if (!m_view) {
 824         return;
 825     }
 826
 827     KItemListRubberBand* rubberBand = m_view->rubberBand();
 828     if (rubberBand->isActive()) {
 829         const qreal diff = current - previous;
 830         // TODO: Ideally just QCursor::pos() should be used as
 831         // new end-position but it seems there is no easy way
 832         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 833         // (... or I just missed an easy way to do the mapping)
 834         QPointF endPos = rubberBand->endPosition();
 835         if (m_view->scrollOrientation() == Qt::Vertical) {
 836             endPos.ry() += diff;
 837         } else {
 838             endPos.rx() += diff;
 839         }
 840
 841         rubberBand->setEndPosition(endPos);
 842     }
 843 }
 844
 845 void KItemListController::slotRubberBandChanged()
 846 {
 847     if (!m_view || !m_model || m_model->count() <= 0) {
 848         return;
 849     }
 850
 851     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 852     const QPointF startPos = rubberBand->startPosition();
 853     const QPointF endPos = rubberBand->endPosition();
 854     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 855
 856     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 857     if (scrollVertical) {
 858         rubberBandRect.translate(0, -m_view->scrollOffset());
 859     } else {
 860         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 861     }
 862
 863     if (!m_oldSelection.isEmpty()) {
 864         // Clear the old selection that was available before the rubberband has
 865         // been activated in case if no Shift- or Control-key are pressed
 866         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 867                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 868         if (!shiftOrControlPressed) {
 869             m_oldSelection.clear();
 870         }
 871     }
 872
 873     QSet<int> selectedItems;
 874
 875     // Select all visible items that intersect with the rubberband
 876     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 877         const int index = widget->index();
 878
 879         const QRectF widgetRect = m_view->itemRect(index);
 880         if (widgetRect.intersects(rubberBandRect)) {
 881             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 882             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 883             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 884                 selectedItems.insert(index);
 885             }
 886         }
 887     }
 888
 889     // Select all invisible items that intersect with the rubberband. Instead of
 890     // iterating all items only the area which might be touched by the rubberband
 891     // will be checked.
 892     const bool increaseIndex = scrollVertical ?
 893                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 894
 895     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 896     bool selectionFinished = false;
 897     do {
 898         const QRectF widgetRect = m_view->itemRect(index);
 899         if (widgetRect.intersects(rubberBandRect)) {
 900             selectedItems.insert(index);
 901         }
 902
 903         if (increaseIndex) {
 904             ++index;
 905             selectionFinished = (index >= m_model->count()) ||
 906                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 907                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 908         } else {
 909             --index;
 910             selectionFinished = (index < 0) ||
 911                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 912                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 913         }
 914     } while (!selectionFinished);
 915
 916     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
 917         // If Control is pressed, the selection state of all items in the rubberband is toggled.
 918         // Therefore, the new selection contains:
 919         // 1. All previously selected items which are not inside the rubberband, and
 920         // 2. all items inside the rubberband which have not been selected previously.
 921         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
 922     }
 923     else {
 924         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
 925     }
 926 }
 927
 928 void KItemListController::startDragging()
 929 {
 930     if (!m_view || !m_model) {
 931         return;
 932     }
 933
 934     const QSet<int> selectedItems = m_selectionManager->selectedItems();
 935     if (selectedItems.isEmpty()) {
 936         return;
 937     }
 938
 939     QMimeData* data = m_model->createMimeData(selectedItems);
 940     if (!data) {
 941         return;
 942     }
 943
 944     // The created drag object will be owned and deleted
 945     // by QApplication::activeWindow().
 946     QDrag* drag = new QDrag(QApplication::activeWindow());
 947     drag->setMimeData(data);
 948
 949     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
 950     drag->setPixmap(pixmap);
 951
 952     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
 953 }
 954
 955 KItemListWidget* KItemListController::hoveredWidget() const
 956 {
 957     Q_ASSERT(m_view);
 958
 959     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 960         if (widget->isHovered()) {
 961             return widget;
 962         }
 963     }
 964
 965     return 0;
 966 }
 967
 968 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
 969 {
 970     Q_ASSERT(m_view);
 971
 972     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 973         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
 974
 975         const bool hovered = widget->contains(mappedPos) &&
 976                              !widget->expansionToggleRect().contains(mappedPos);
 977         if (hovered) {
 978             return widget;
 979         }
 980     }
 981
 982     return 0;
 983 }
 984
 985 void KItemListController::updateKeyboardAnchor()
 986 {
 987     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
 988                              m_keyboardAnchorIndex < m_model->count() &&
 989                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
 990     if (!validAnchor) {
 991         const int index = m_selectionManager->currentItem();
 992         m_keyboardAnchorIndex = index;
 993         m_keyboardAnchorPos = keyboardAnchorPos(index);
 994     }
 995 }
 996
 997 int KItemListController::nextRowIndex() const
 998 {
 999     const int currentIndex = m_selectionManager->currentItem();
1000     if (m_keyboardAnchorIndex < 0) {
1001         return currentIndex;
1002     }
1003
1004     const int maxIndex = m_model->count() - 1;
1005     if (currentIndex == maxIndex) {
1006         return currentIndex;
1007     }
1008
1009     // Calculate the index of the last column inside the row of the current index
1010     int lastColumnIndex = currentIndex;
1011     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1012         ++lastColumnIndex;
1013         if (lastColumnIndex >= maxIndex) {
1014             return currentIndex;
1015         }
1016     }
1017
1018     // Based on the last column index go to the next row and calculate the nearest index
1019     // that is below the current index
1020     int nextRowIndex = lastColumnIndex + 1;
1021     int searchIndex = nextRowIndex;
1022     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1023     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1024         ++searchIndex;
1025         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1026         if (searchDiff < minDiff) {
1027             minDiff = searchDiff;
1028             nextRowIndex = searchIndex;
1029         }
1030     }
1031
1032     return nextRowIndex;
1033 }
1034
1035 int KItemListController::previousRowIndex() const
1036 {
1037     const int currentIndex = m_selectionManager->currentItem();
1038     if (m_keyboardAnchorIndex < 0 || currentIndex == 0) {
1039         return currentIndex;
1040     }
1041
1042     // Calculate the index of the first column inside the row of the current index
1043     int firstColumnIndex = currentIndex;
1044     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1045         --firstColumnIndex;
1046         if (firstColumnIndex <= 0) {
1047             return currentIndex;
1048         }
1049     }
1050
1051     // Based on the first column index go to the previous row and calculate the nearest index
1052     // that is above the current index
1053     int previousRowIndex = firstColumnIndex - 1;
1054     int searchIndex = previousRowIndex;
1055     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1056     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1057         --searchIndex;
1058         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1059         if (searchDiff < minDiff) {
1060             minDiff = searchDiff;
1061             previousRowIndex = searchIndex;
1062         }
1063     }
1064
1065     return previousRowIndex;
1066 }
1067
1068 qreal KItemListController::keyboardAnchorPos(int index) const
1069 {
1070     const QRectF itemRect = m_view->itemRect(index);
1071     if (!itemRect.isEmpty()) {
1072         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1073     }
1074
1075     return 0;
1076 }
1077
1078 #include "kitemlistcontroller.moc"