src/kitemviews/kitemlistcontroller.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *   Copyright (C) 2012 by Frank Reininghaus <frank78ac@googlemail.com>    *
   4  *                                                                         *
   5  *   Based on the Itemviews NG project from Trolltech Labs:                *
   6  *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  22  ***************************************************************************/
  23
  24 #include "kitemlistcontroller.h"
  25
  26 #include <KGlobalSettings>
  27 #include <KDebug>
  28
  29 #include "kitemlistview.h"
  30 #include "kitemlistselectionmanager.h"
  31
  32 #include "private/kitemlistrubberband.h"
  33 #include "private/kitemlistkeyboardsearchmanager.h"
  34
  35 #include <QApplication>
  36 #include <QDrag>
  37 #include <QEvent>
  38 #include <QGraphicsScene>
  39 #include <QGraphicsSceneEvent>
  40 #include <QGraphicsView>
  41 #include <QMimeData>
  42 #include <QTimer>
  43 #include <QAccessible>
  44
  45 KItemListController::KItemListController(KItemModelBase* model, KItemListView* view, QObject* parent) :
  46     QObject(parent),
  47     m_singleClickActivation(KGlobalSettings::singleClick()),
  48     m_selectionTogglePressed(false),
  49     m_clearSelectionIfItemsAreNotDragged(false),
  50     m_selectionBehavior(NoSelection),
  51     m_model(0),
  52     m_view(0),
  53     m_selectionManager(new KItemListSelectionManager(this)),
  54     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
  55     m_pressedIndex(-1),
  56     m_pressedMousePos(),
  57     m_autoActivationTimer(0),
  58     m_oldSelection(),
  59     m_keyboardAnchorIndex(-1),
  60     m_keyboardAnchorPos(0)
  61 {
  62     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
  63             this, SLOT(slotChangeCurrentItem(QString,bool)));
  64     connect(m_selectionManager, SIGNAL(currentChanged(int,int)),
  65             m_keyboardManager, SLOT(slotCurrentChanged(int,int)));
  66
  67     m_autoActivationTimer = new QTimer(this);
  68     m_autoActivationTimer->setSingleShot(true);
  69     m_autoActivationTimer->setInterval(-1);
  70     connect(m_autoActivationTimer, SIGNAL(timeout()), this, SLOT(slotAutoActivationTimeout()));
  71
  72     setModel(model);
  73     setView(view);
  74 }
  75
  76 KItemListController::~KItemListController()
  77 {
  78     setView(0);
  79     Q_ASSERT(!m_view);
  80
  81     setModel(0);
  82     Q_ASSERT(!m_model);
  83 }
  84
  85 void KItemListController::setModel(KItemModelBase* model)
  86 {
  87     if (m_model == model) {
  88         return;
  89     }
  90
  91     KItemModelBase* oldModel = m_model;
  92     if (oldModel) {
  93         oldModel->deleteLater();
  94     }
  95
  96     m_model = model;
  97     if (m_model) {
  98         m_model->setParent(this);
  99     }
 100
 101     if (m_view) {
 102         m_view->setModel(m_model);
 103     }
 104
 105     m_selectionManager->setModel(m_model);
 106
 107     emit modelChanged(m_model, oldModel);
 108 }
 109
 110 KItemModelBase* KItemListController::model() const
 111 {
 112     return m_model;
 113 }
 114
 115 KItemListSelectionManager* KItemListController::selectionManager() const
 116 {
 117     return m_selectionManager;
 118 }
 119
 120 void KItemListController::setView(KItemListView* view)
 121 {
 122     if (m_view == view) {
 123         return;
 124     }
 125
 126     KItemListView* oldView = m_view;
 127     if (oldView) {
 128         disconnect(oldView, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 129         oldView->deleteLater();
 130     }
 131
 132     m_view = view;
 133
 134     if (m_view) {
 135         m_view->setParent(this);
 136         m_view->setController(this);
 137         m_view->setModel(m_model);
 138         connect(m_view, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(slotViewScrollOffsetChanged(qreal,qreal)));
 139         updateExtendedSelectionRegion();
 140     }
 141
 142     emit viewChanged(m_view, oldView);
 143 }
 144
 145 KItemListView* KItemListController::view() const
 146 {
 147     return m_view;
 148 }
 149
 150 void KItemListController::setSelectionBehavior(SelectionBehavior behavior)
 151 {
 152     m_selectionBehavior = behavior;
 153     updateExtendedSelectionRegion();
 154 }
 155
 156 KItemListController::SelectionBehavior KItemListController::selectionBehavior() const
 157 {
 158     return m_selectionBehavior;
 159 }
 160
 161 void KItemListController::setAutoActivationDelay(int delay)
 162 {
 163     m_autoActivationTimer->setInterval(delay);
 164 }
 165
 166 int KItemListController::autoActivationDelay() const
 167 {
 168     return m_autoActivationTimer->interval();
 169 }
 170
 171 void KItemListController::setSingleClickActivation(bool singleClick)
 172 {
 173     m_singleClickActivation = singleClick;
 174 }
 175
 176 bool KItemListController::singleClickActivation() const
 177 {
 178     return m_singleClickActivation;
 179 }
 180
 181 bool KItemListController::showEvent(QShowEvent* event)
 182 {
 183     Q_UNUSED(event);
 184     return false;
 185 }
 186
 187 bool KItemListController::hideEvent(QHideEvent* event)
 188 {
 189     Q_UNUSED(event);
 190     return false;
 191 }
 192
 193 bool KItemListController::keyPressEvent(QKeyEvent* event)
 194 {
 195     int index = m_selectionManager->currentItem();
 196     int key = event->key();
 197
 198     // Handle the expanding/collapsing of items
 199     if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 200         if (key == Qt::Key_Right) {
 201             if (m_model->setExpanded(index, true)) {
 202                 return true;
 203             }
 204         } else if (key == Qt::Key_Left) {
 205             if (m_model->setExpanded(index, false)) {
 206                 return true;
 207             }
 208         }
 209     }
 210
 211     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 212     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 213     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 214
 215     const int itemCount = m_model->count();
 216
 217     // For horizontal scroll orientation, transform
 218     // the arrow keys to simplify the event handling.
 219     if (m_view->scrollOrientation() == Qt::Horizontal) {
 220         switch (key) {
 221         case Qt::Key_Up:    key = Qt::Key_Left; break;
 222         case Qt::Key_Down:  key = Qt::Key_Right; break;
 223         case Qt::Key_Left:  key = Qt::Key_Up; break;
 224         case Qt::Key_Right: key = Qt::Key_Down; break;
 225         default:            break;
 226         }
 227     }
 228
 229     const bool selectSingleItem = m_selectionBehavior != NoSelection &&
 230                                   itemCount == 1 &&
 231                                   (key == Qt::Key_Home || key == Qt::Key_End  ||
 232                                    key == Qt::Key_Up   || key == Qt::Key_Down ||
 233                                    key == Qt::Key_Left || key == Qt::Key_Right);
 234     if (selectSingleItem) {
 235         const int current = m_selectionManager->currentItem();
 236         m_selectionManager->setSelected(current);
 237         return true;
 238     }
 239
 240     switch (key) {
 241     case Qt::Key_Home:
 242         index = 0;
 243         m_keyboardAnchorIndex = index;
 244         m_keyboardAnchorPos = keyboardAnchorPos(index);
 245         break;
 246
 247     case Qt::Key_End:
 248         index = itemCount - 1;
 249         m_keyboardAnchorIndex = index;
 250         m_keyboardAnchorPos = keyboardAnchorPos(index);
 251         break;
 252
 253     case Qt::Key_Left:
 254         if (index > 0) {
 255             const int expandedParentsCount = m_model->expandedParentsCount(index);
 256             if (expandedParentsCount == 0) {
 257                 --index;
 258             } else {
 259                 // Go to the parent of the current item.
 260                 do {
 261                     --index;
 262                 } while (index > 0 && m_model->expandedParentsCount(index) == expandedParentsCount);
 263             }
 264             m_keyboardAnchorIndex = index;
 265             m_keyboardAnchorPos = keyboardAnchorPos(index);
 266         }
 267         break;
 268
 269     case Qt::Key_Right:
 270         if (index < itemCount - 1) {
 271             ++index;
 272             m_keyboardAnchorIndex = index;
 273             m_keyboardAnchorPos = keyboardAnchorPos(index);
 274         }
 275         break;
 276
 277     case Qt::Key_Up:
 278         updateKeyboardAnchor();
 279         index = previousRowIndex(index);
 280         break;
 281
 282     case Qt::Key_Down:
 283         updateKeyboardAnchor();
 284         index = nextRowIndex(index);
 285         break;
 286
 287     case Qt::Key_PageUp:
 288         if (m_view->scrollOrientation() == Qt::Horizontal) {
 289             // The new current index should correspond to the first item in the current column.
 290             int newIndex = qMax(index - 1, 0);
 291             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() < m_view->itemRect(index).topLeft().y()) {
 292                 index = newIndex;
 293                 newIndex = qMax(index - 1, 0);
 294             }
 295             m_keyboardAnchorIndex = index;
 296             m_keyboardAnchorPos = keyboardAnchorPos(index);
 297         } else {
 298             const qreal currentItemBottom = m_view->itemRect(index).bottomLeft().y();
 299             const qreal height = m_view->geometry().height();
 300
 301             // The new current item should be the first item in the current
 302             // column whose itemRect's top coordinate is larger than targetY.
 303             const qreal targetY = currentItemBottom - height;
 304
 305             updateKeyboardAnchor();
 306             int newIndex = previousRowIndex(index);
 307             do {
 308                 index = newIndex;
 309                 updateKeyboardAnchor();
 310                 newIndex = previousRowIndex(index);
 311             } while (m_view->itemRect(newIndex).topLeft().y() > targetY && newIndex != index);
 312         }
 313         break;
 314
 315     case Qt::Key_PageDown:
 316         if (m_view->scrollOrientation() == Qt::Horizontal) {
 317             // The new current index should correspond to the last item in the current column.
 318             int newIndex = qMin(index + 1, m_model->count() - 1);
 319             while (newIndex != index && m_view->itemRect(newIndex).topLeft().y() > m_view->itemRect(index).topLeft().y()) {
 320                 index = newIndex;
 321                 newIndex = qMin(index + 1, m_model->count() - 1);
 322             }
 323             m_keyboardAnchorIndex = index;
 324             m_keyboardAnchorPos = keyboardAnchorPos(index);
 325         } else {
 326             const qreal currentItemTop = m_view->itemRect(index).topLeft().y();
 327             const qreal height = m_view->geometry().height();
 328
 329             // The new current item should be the last item in the current
 330             // column whose itemRect's bottom coordinate is smaller than targetY.
 331             const qreal targetY = currentItemTop + height;
 332
 333             updateKeyboardAnchor();
 334             int newIndex = nextRowIndex(index);
 335             do {
 336                 index = newIndex;
 337                 updateKeyboardAnchor();
 338                 newIndex = nextRowIndex(index);
 339             } while (m_view->itemRect(newIndex).bottomLeft().y() < targetY && newIndex != index);
 340         }
 341         break;
 342
 343     case Qt::Key_Enter:
 344     case Qt::Key_Return: {
 345         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 346         if (selectedItems.count() >= 2) {
 347             emit itemsActivated(selectedItems);
 348         } else if (selectedItems.count() == 1) {
 349             emit itemActivated(selectedItems.toList().first());
 350         } else {
 351             emit itemActivated(index);
 352         }
 353         break;
 354     }
 355
 356     case Qt::Key_Space:
 357         if (m_selectionBehavior == MultiSelection) {
 358             if (controlPressed) {
 359                 m_selectionManager->endAnchoredSelection();
 360                 m_selectionManager->setSelected(index, 1, KItemListSelectionManager::Toggle);
 361                 m_selectionManager->beginAnchoredSelection(index);
 362             } else {
 363                 const int current = m_selectionManager->currentItem();
 364                 m_selectionManager->setSelected(current);
 365             }
 366         }
 367         break;
 368
 369     case Qt::Key_Menu: {
 370         // Emit the signal itemContextMenuRequested() in case if at least one
 371         // item is selected. Otherwise the signal viewContextMenuRequested() will be emitted.
 372         const QSet<int> selectedItems = m_selectionManager->selectedItems();
 373         int index = -1;
 374         if (selectedItems.count() >= 2) {
 375             const int currentItemIndex = m_selectionManager->currentItem();
 376             index = selectedItems.contains(currentItemIndex)
 377                     ? currentItemIndex : selectedItems.toList().first();
 378         } else if (selectedItems.count() == 1) {
 379             index = selectedItems.toList().first();
 380         }
 381
 382         if (index >= 0) {
 383             const QRectF contextRect = m_view->itemContextRect(index);
 384             const QPointF pos(m_view->scene()->views().first()->mapToGlobal(contextRect.bottomRight().toPoint()));
 385             emit itemContextMenuRequested(index, pos);
 386         } else {
 387             emit viewContextMenuRequested(QCursor::pos());
 388         }
 389         break;
 390     }
 391
 392     case Qt::Key_Escape:
 393         if (m_selectionBehavior != SingleSelection) {
 394             m_selectionManager->clearSelection();
 395         }
 396         m_keyboardManager->cancelSearch();
 397         break;
 398
 399     default:
 400         m_keyboardManager->addKeys(event->text());
 401         return false;
 402     }
 403
 404     if (m_selectionManager->currentItem() != index) {
 405         switch (m_selectionBehavior) {
 406         case NoSelection:
 407             m_selectionManager->setCurrentItem(index);
 408             break;
 409
 410         case SingleSelection:
 411             m_selectionManager->setCurrentItem(index);
 412             m_selectionManager->clearSelection();
 413             m_selectionManager->setSelected(index, 1);
 414             break;
 415
 416         case MultiSelection:
 417             if (controlPressed) {
 418                 m_selectionManager->endAnchoredSelection();
 419             }
 420
 421             m_selectionManager->setCurrentItem(index);
 422
 423             if (!shiftOrControlPressed) {
 424                 m_selectionManager->clearSelection();
 425                 m_selectionManager->setSelected(index, 1);
 426             }
 427
 428             if (!shiftPressed) {
 429                 m_selectionManager->beginAnchoredSelection(index);
 430             }
 431             break;
 432         }
 433
 434         m_view->scrollToItem(index);
 435     }
 436     return true;
 437 }
 438
 439 void KItemListController::slotChangeCurrentItem(const QString& text, bool searchFromNextItem)
 440 {
 441     if (!m_model || m_model->count() == 0) {
 442         return;
 443     }
 444     const int currentIndex = m_selectionManager->currentItem();
 445     int index;
 446     if (searchFromNextItem) {
 447         index = m_model->indexForKeyboardSearch(text, (currentIndex + 1) % m_model->count());
 448     } else {
 449         index = m_model->indexForKeyboardSearch(text, currentIndex);
 450     }
 451     if (index >= 0) {
 452         m_selectionManager->setCurrentItem(index);
 453         m_selectionManager->clearSelection();
 454         m_selectionManager->setSelected(index, 1);
 455         m_selectionManager->beginAnchoredSelection(index);
 456         m_view->scrollToItem(index);
 457     }
 458 }
 459
 460 void KItemListController::slotAutoActivationTimeout()
 461 {
 462     if (!m_model || !m_view) {
 463         return;
 464     }
 465
 466     const int index = m_autoActivationTimer->property("index").toInt();
 467     if (index < 0 || index >= m_model->count()) {
 468         return;
 469     }
 470
 471     if (m_model->supportsDropping(index)) {
 472         if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
 473             const bool expanded = m_model->isExpanded(index);
 474             m_model->setExpanded(index, !expanded);
 475         } else {
 476             emit itemActivated(index);
 477         }
 478     }
 479 }
 480
 481 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 482 {
 483     Q_UNUSED(event);
 484     return false;
 485 }
 486
 487 bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 488 {
 489     if (!m_view) {
 490         return false;
 491     }
 492
 493     m_pressedMousePos = transform.map(event->pos());
 494     m_pressedIndex = m_view->itemAt(m_pressedMousePos);
 495     emit mouseButtonPressed(m_pressedIndex, event->buttons());
 496
 497     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 498         m_selectionManager->endAnchoredSelection();
 499         m_selectionManager->setCurrentItem(m_pressedIndex);
 500         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 501         return true;
 502     }
 503
 504     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 505     if (m_selectionTogglePressed) {
 506         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 507         // The previous anchored selection has been finished already in
 508         // KItemListSelectionManager::setSelected(). We can safely change
 509         // the current item and start a new anchored selection now.
 510         m_selectionManager->setCurrentItem(m_pressedIndex);
 511         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 512         return true;
 513     }
 514
 515     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 516     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 517
 518     // The previous selection is cleared if either
 519     // 1. The selection mode is SingleSelection, or
 520     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 521     //    a) Shift or Control are pressed.
 522     //    b) The clicked item is selected already. In that case, the user might want to:
 523     //       - start dragging multiple items, or
 524     //       - open the context menu and perform an action for all selected items.
 525     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 526     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 527     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 528                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 529     if (clearSelection) {
 530         m_selectionManager->clearSelection();
 531     } else if (pressedItemAlreadySelected && !shiftOrControlPressed && (event->buttons() & Qt::LeftButton)) {
 532         // The user might want to start dragging multiple items, but if he clicks the item
 533         // in order to trigger it instead, the other selected items must be deselected.
 534         // However, we do not know yet what the user is going to do.
 535         // -> remember that the user pressed an item which had been selected already and
 536         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
 537         m_clearSelectionIfItemsAreNotDragged = true;
 538     }
 539
 540     if (!shiftPressed) {
 541         // Finish the anchored selection before the current index is changed
 542         m_selectionManager->endAnchoredSelection();
 543     }
 544
 545     if (m_pressedIndex >= 0) {
 546         m_selectionManager->setCurrentItem(m_pressedIndex);
 547
 548         switch (m_selectionBehavior) {
 549         case NoSelection:
 550             break;
 551
 552         case SingleSelection:
 553             m_selectionManager->setSelected(m_pressedIndex);
 554             break;
 555
 556         case MultiSelection:
 557             if (controlPressed && !shiftPressed) {
 558                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 559                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 560             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 561                 // Select the pressed item and start a new anchored selection
 562                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 563                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 564             }
 565             break;
 566
 567         default:
 568             Q_ASSERT(false);
 569             break;
 570         }
 571
 572         if (event->buttons() & Qt::RightButton) {
 573             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 574         }
 575
 576         return true;
 577     }
 578
 579     if (event->buttons() & Qt::RightButton) {
 580         const QRectF headerBounds = m_view->headerBoundaries();
 581         if (headerBounds.contains(event->pos())) {
 582             emit headerContextMenuRequested(event->screenPos());
 583         } else {
 584             emit viewContextMenuRequested(event->screenPos());
 585         }
 586         return true;
 587     }
 588
 589     if (m_selectionBehavior == MultiSelection) {
 590         QPointF startPos = m_pressedMousePos;
 591         if (m_view->scrollOrientation() == Qt::Vertical) {
 592             startPos.ry() += m_view->scrollOffset();
 593             if (m_view->itemSize().width() < 0) {
 594                 // Use a special rubberband for views that have only one column and
 595                 // expand the rubberband to use the whole width of the view.
 596                 startPos.setX(0);
 597             }
 598         } else {
 599             startPos.rx() += m_view->scrollOffset();
 600         }
 601
 602         m_oldSelection = m_selectionManager->selectedItems();
 603         KItemListRubberBand* rubberBand = m_view->rubberBand();
 604         rubberBand->setStartPosition(startPos);
 605         rubberBand->setEndPosition(startPos);
 606         rubberBand->setActive(true);
 607         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 608         m_view->setAutoScroll(true);
 609     }
 610
 611     return false;
 612 }
 613
 614 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 615 {
 616     if (!m_view) {
 617         return false;
 618     }
 619
 620     if (m_pressedIndex >= 0) {
 621         // Check whether a dragging should be started
 622         if (event->buttons() & Qt::LeftButton) {
 623             const QPointF pos = transform.map(event->pos());
 624             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 625                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 626                     // Always assure that the dragged item gets selected. Usually this is already
 627                     // done on the mouse-press event, but when using the selection-toggle on a
 628                     // selected item the dragged item is not selected yet.
 629                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 630                 } else {
 631                     // A selected item has been clicked to drag all selected items
 632                     // -> the selection should not be cleared when the mouse button is released.
 633                     m_clearSelectionIfItemsAreNotDragged = false;
 634                 }
 635
 636                 startDragging();
 637             }
 638         }
 639     } else {
 640         KItemListRubberBand* rubberBand = m_view->rubberBand();
 641         if (rubberBand->isActive()) {
 642             QPointF endPos = transform.map(event->pos());
 643
 644             // Update the current item.
 645             const int newCurrent = m_view->itemAt(endPos);
 646             if (newCurrent >= 0) {
 647                 // It's expected that the new current index is also the new anchor (bug 163451).
 648                 m_selectionManager->endAnchoredSelection();
 649                 m_selectionManager->setCurrentItem(newCurrent);
 650                 m_selectionManager->beginAnchoredSelection(newCurrent);
 651             }
 652
 653             if (m_view->scrollOrientation() == Qt::Vertical) {
 654                 endPos.ry() += m_view->scrollOffset();
 655                 if (m_view->itemSize().width() < 0) {
 656                     // Use a special rubberband for views that have only one column and
 657                     // expand the rubberband to use the whole width of the view.
 658                     endPos.setX(m_view->size().width());
 659                 }
 660             } else {
 661                 endPos.rx() += m_view->scrollOffset();
 662             }
 663             rubberBand->setEndPosition(endPos);
 664         }
 665     }
 666
 667     return false;
 668 }
 669
 670 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 671 {
 672     if (!m_view) {
 673         return false;
 674     }
 675
 676     emit mouseButtonReleased(m_pressedIndex, event->buttons());
 677
 678     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 679     if (isAboveSelectionToggle) {
 680         m_selectionTogglePressed = false;
 681         return true;
 682     }
 683
 684     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 685         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 686         m_selectionTogglePressed = false;
 687         return true;
 688     }
 689
 690     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 691                                        event->modifiers() & Qt::ControlModifier;
 692
 693     KItemListRubberBand* rubberBand = m_view->rubberBand();
 694     if (rubberBand->isActive()) {
 695         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 696         rubberBand->setActive(false);
 697         m_oldSelection.clear();
 698         m_view->setAutoScroll(false);
 699     }
 700
 701     const QPointF pos = transform.map(event->pos());
 702     const int index = m_view->itemAt(pos);
 703
 704     if (index >= 0 && index == m_pressedIndex) {
 705         // The release event is done above the same item as the press event
 706
 707         if (m_clearSelectionIfItemsAreNotDragged) {
 708             // A selected item has been clicked, but no drag operation has been started
 709             // -> clear the rest of the selection.
 710             m_selectionManager->clearSelection();
 711             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 712             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 713         }
 714
 715         if (event->button() & Qt::LeftButton) {
 716             bool emitItemActivated = true;
 717             if (m_view->isAboveExpansionToggle(index, pos)) {
 718                 const bool expanded = m_model->isExpanded(index);
 719                 m_model->setExpanded(index, !expanded);
 720
 721                 emit itemExpansionToggleClicked(index);
 722                 emitItemActivated = false;
 723             } else if (shiftOrControlPressed) {
 724                 // The mouse click should only update the selection, not trigger the item
 725                 emitItemActivated = false;
 726             } else if (!m_singleClickActivation) {
 727                 emitItemActivated = false;
 728             }
 729             if (emitItemActivated) {
 730                 emit itemActivated(index);
 731             }
 732         } else if (event->button() & Qt::MidButton) {
 733             emit itemMiddleClicked(index);
 734         }
 735     }
 736
 737     m_pressedMousePos = QPointF();
 738     m_pressedIndex = -1;
 739     m_clearSelectionIfItemsAreNotDragged = false;
 740     return false;
 741 }
 742
 743 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 744 {
 745     const QPointF pos = transform.map(event->pos());
 746     const int index = m_view->itemAt(pos);
 747
 748     bool emitItemActivated = !m_singleClickActivation &&
 749                              (event->button() & Qt::LeftButton) &&
 750                              index >= 0 && index < m_model->count();
 751     if (emitItemActivated) {
 752         emit itemActivated(index);
 753     }
 754     return false;
 755 }
 756
 757 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 758 {
 759     Q_UNUSED(event);
 760     Q_UNUSED(transform);
 761     return false;
 762 }
 763
 764 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 765 {
 766     Q_UNUSED(event);
 767     Q_UNUSED(transform);
 768
 769     m_view->setAutoScroll(false);
 770     m_view->hideDropIndicator();
 771
 772     KItemListWidget* widget = hoveredWidget();
 773     if (widget) {
 774         widget->setHovered(false);
 775         emit itemUnhovered(widget->index());
 776     }
 777     return false;
 778 }
 779
 780 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 781 {
 782     if (!m_model || !m_view) {
 783         return false;
 784     }
 785
 786     event->acceptProposedAction();
 787
 788     KItemListWidget* oldHoveredWidget = hoveredWidget();
 789
 790     const QPointF pos = transform.map(event->pos());
 791     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 792
 793     if (oldHoveredWidget != newHoveredWidget) {
 794         m_autoActivationTimer->stop();
 795
 796         if (oldHoveredWidget) {
 797             oldHoveredWidget->setHovered(false);
 798             emit itemUnhovered(oldHoveredWidget->index());
 799         }
 800
 801         if (newHoveredWidget) {
 802             bool droppingBetweenItems = false;
 803             if (m_model->sortRole().isEmpty()) {
 804                 // The model supports inserting items between other items.
 805                 droppingBetweenItems = (m_view->showDropIndicator(pos) >= 0);
 806             }
 807
 808             const int index = newHoveredWidget->index();
 809             if (!droppingBetweenItems && m_model->supportsDropping(index)) {
 810                 // Something has been dragged on an item.
 811                 m_view->hideDropIndicator();
 812                 newHoveredWidget->setHovered(true);
 813                 emit itemHovered(index);
 814
 815                 if (m_autoActivationTimer->interval() >= 0) {
 816                     m_autoActivationTimer->setProperty("index", index);
 817                     m_autoActivationTimer->start();
 818                 }
 819             }
 820         }
 821     }
 822
 823     return false;
 824 }
 825
 826 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 827 {
 828     if (!m_view) {
 829         return false;
 830     }
 831
 832     m_autoActivationTimer->stop();
 833     m_view->setAutoScroll(false);
 834
 835     const QPointF pos = transform.map(event->pos());
 836
 837     int dropAboveIndex = -1;
 838     if (m_model->sortRole().isEmpty()) {
 839         // The model supports inserting of items between other items.
 840         dropAboveIndex = m_view->showDropIndicator(pos);
 841     }
 842
 843     if (dropAboveIndex >= 0) {
 844         // Something has been dropped between two items.
 845         m_view->hideDropIndicator();
 846         emit aboveItemDropEvent(dropAboveIndex, event);
 847     } else {
 848         // Something has been dropped on an item or on an empty part of the view.
 849         emit itemDropEvent(m_view->itemAt(pos), event);
 850     }
 851
 852     QAccessible::updateAccessibility(view(), 0, QAccessible::DragDropEnd);
 853
 854     return true;
 855 }
 856
 857 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 858 {
 859     Q_UNUSED(event);
 860     Q_UNUSED(transform);
 861     return false;
 862 }
 863
 864 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 865 {
 866     Q_UNUSED(transform);
 867     if (!m_model || !m_view) {
 868         return false;
 869     }
 870
 871     KItemListWidget* oldHoveredWidget = hoveredWidget();
 872     const QPointF pos = transform.map(event->pos());
 873     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 874
 875     if (oldHoveredWidget != newHoveredWidget) {
 876         if (oldHoveredWidget) {
 877             oldHoveredWidget->setHovered(false);
 878             emit itemUnhovered(oldHoveredWidget->index());
 879         }
 880
 881         if (newHoveredWidget) {
 882             newHoveredWidget->setHovered(true);
 883             emit itemHovered(newHoveredWidget->index());
 884         }
 885     }
 886
 887     return false;
 888 }
 889
 890 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 891 {
 892     Q_UNUSED(event);
 893     Q_UNUSED(transform);
 894
 895     if (!m_model || !m_view) {
 896         return false;
 897     }
 898
 899     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 900         if (widget->isHovered()) {
 901             widget->setHovered(false);
 902             emit itemUnhovered(widget->index());
 903         }
 904     }
 905     return false;
 906 }
 907
 908 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 909 {
 910     Q_UNUSED(event);
 911     Q_UNUSED(transform);
 912     return false;
 913 }
 914
 915 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 916 {
 917     Q_UNUSED(event);
 918     Q_UNUSED(transform);
 919     return false;
 920 }
 921
 922 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 923 {
 924     if (!event) {
 925         return false;
 926     }
 927
 928     switch (event->type()) {
 929     case QEvent::KeyPress:
 930         return keyPressEvent(static_cast<QKeyEvent*>(event));
 931     case QEvent::InputMethod:
 932         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 933     case QEvent::GraphicsSceneMousePress:
 934         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 935     case QEvent::GraphicsSceneMouseMove:
 936         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 937     case QEvent::GraphicsSceneMouseRelease:
 938         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 939     case QEvent::GraphicsSceneMouseDoubleClick:
 940         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 941     case QEvent::GraphicsSceneWheel:
 942          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 943     case QEvent::GraphicsSceneDragEnter:
 944         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 945     case QEvent::GraphicsSceneDragLeave:
 946         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 947     case QEvent::GraphicsSceneDragMove:
 948         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 949     case QEvent::GraphicsSceneDrop:
 950         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 951     case QEvent::GraphicsSceneHoverEnter:
 952         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 953     case QEvent::GraphicsSceneHoverMove:
 954         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 955     case QEvent::GraphicsSceneHoverLeave:
 956         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 957     case QEvent::GraphicsSceneResize:
 958         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 959     default:
 960         break;
 961     }
 962
 963     return false;
 964 }
 965
 966 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 967 {
 968     if (!m_view) {
 969         return;
 970     }
 971
 972     KItemListRubberBand* rubberBand = m_view->rubberBand();
 973     if (rubberBand->isActive()) {
 974         const qreal diff = current - previous;
 975         // TODO: Ideally just QCursor::pos() should be used as
 976         // new end-position but it seems there is no easy way
 977         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 978         // (... or I just missed an easy way to do the mapping)
 979         QPointF endPos = rubberBand->endPosition();
 980         if (m_view->scrollOrientation() == Qt::Vertical) {
 981             endPos.ry() += diff;
 982         } else {
 983             endPos.rx() += diff;
 984         }
 985
 986         rubberBand->setEndPosition(endPos);
 987     }
 988 }
 989
 990 void KItemListController::slotRubberBandChanged()
 991 {
 992     if (!m_view || !m_model || m_model->count() <= 0) {
 993         return;
 994     }
 995
 996     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 997     const QPointF startPos = rubberBand->startPosition();
 998     const QPointF endPos = rubberBand->endPosition();
 999     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
1000
1001     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
1002     if (scrollVertical) {
1003         rubberBandRect.translate(0, -m_view->scrollOffset());
1004     } else {
1005         rubberBandRect.translate(-m_view->scrollOffset(), 0);
1006     }
1007
1008     if (!m_oldSelection.isEmpty()) {
1009         // Clear the old selection that was available before the rubberband has
1010         // been activated in case if no Shift- or Control-key are pressed
1011         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
1012                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
1013         if (!shiftOrControlPressed) {
1014             m_oldSelection.clear();
1015         }
1016     }
1017
1018     QSet<int> selectedItems;
1019
1020     // Select all visible items that intersect with the rubberband
1021     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1022         const int index = widget->index();
1023
1024         const QRectF widgetRect = m_view->itemRect(index);
1025         if (widgetRect.intersects(rubberBandRect)) {
1026             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
1027             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
1028             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
1029                 selectedItems.insert(index);
1030             }
1031         }
1032     }
1033
1034     // Select all invisible items that intersect with the rubberband. Instead of
1035     // iterating all items only the area which might be touched by the rubberband
1036     // will be checked.
1037     const bool increaseIndex = scrollVertical ?
1038                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
1039
1040     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
1041     bool selectionFinished = false;
1042     do {
1043         const QRectF widgetRect = m_view->itemRect(index);
1044         if (widgetRect.intersects(rubberBandRect)) {
1045             selectedItems.insert(index);
1046         }
1047
1048         if (increaseIndex) {
1049             ++index;
1050             selectionFinished = (index >= m_model->count()) ||
1051                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
1052                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
1053         } else {
1054             --index;
1055             selectionFinished = (index < 0) ||
1056                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
1057                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
1058         }
1059     } while (!selectionFinished);
1060
1061     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1062         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1063         // Therefore, the new selection contains:
1064         // 1. All previously selected items which are not inside the rubberband, and
1065         // 2. all items inside the rubberband which have not been selected previously.
1066         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
1067     }
1068     else {
1069         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1070     }
1071 }
1072
1073 void KItemListController::startDragging()
1074 {
1075     if (!m_view || !m_model) {
1076         return;
1077     }
1078
1079     const QSet<int> selectedItems = m_selectionManager->selectedItems();
1080     if (selectedItems.isEmpty()) {
1081         return;
1082     }
1083
1084     QMimeData* data = m_model->createMimeData(selectedItems);
1085     if (!data) {
1086         return;
1087     }
1088
1089     // The created drag object will be owned and deleted
1090     // by QApplication::activeWindow().
1091     QDrag* drag = new QDrag(QApplication::activeWindow());
1092     drag->setMimeData(data);
1093
1094     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1095     drag->setPixmap(pixmap);
1096
1097     const QPoint hotSpot(pixmap.width() / 2, 0);
1098     drag->setHotSpot(hotSpot);
1099
1100     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1101     QAccessible::updateAccessibility(view(), 0, QAccessible::DragDropStart);
1102 }
1103
1104 KItemListWidget* KItemListController::hoveredWidget() const
1105 {
1106     Q_ASSERT(m_view);
1107
1108     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1109         if (widget->isHovered()) {
1110             return widget;
1111         }
1112     }
1113
1114     return 0;
1115 }
1116
1117 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1118 {
1119     Q_ASSERT(m_view);
1120
1121     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1122         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1123
1124         const bool hovered = widget->contains(mappedPos) &&
1125                              !widget->expansionToggleRect().contains(mappedPos);
1126         if (hovered) {
1127             return widget;
1128         }
1129     }
1130
1131     return 0;
1132 }
1133
1134 void KItemListController::updateKeyboardAnchor()
1135 {
1136     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1137                              m_keyboardAnchorIndex < m_model->count() &&
1138                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1139     if (!validAnchor) {
1140         const int index = m_selectionManager->currentItem();
1141         m_keyboardAnchorIndex = index;
1142         m_keyboardAnchorPos = keyboardAnchorPos(index);
1143     }
1144 }
1145
1146 int KItemListController::nextRowIndex(int index) const
1147 {
1148     if (m_keyboardAnchorIndex < 0) {
1149         return index;
1150     }
1151
1152     const int maxIndex = m_model->count() - 1;
1153     if (index == maxIndex) {
1154         return index;
1155     }
1156
1157     // Calculate the index of the last column inside the row of the current index
1158     int lastColumnIndex = index;
1159     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1160         ++lastColumnIndex;
1161         if (lastColumnIndex >= maxIndex) {
1162             return index;
1163         }
1164     }
1165
1166     // Based on the last column index go to the next row and calculate the nearest index
1167     // that is below the current index
1168     int nextRowIndex = lastColumnIndex + 1;
1169     int searchIndex = nextRowIndex;
1170     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1171     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1172         ++searchIndex;
1173         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1174         if (searchDiff < minDiff) {
1175             minDiff = searchDiff;
1176             nextRowIndex = searchIndex;
1177         }
1178     }
1179
1180     return nextRowIndex;
1181 }
1182
1183 int KItemListController::previousRowIndex(int index) const
1184 {
1185     if (m_keyboardAnchorIndex < 0 || index == 0) {
1186         return index;
1187     }
1188
1189     // Calculate the index of the first column inside the row of the current index
1190     int firstColumnIndex = index;
1191     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1192         --firstColumnIndex;
1193         if (firstColumnIndex <= 0) {
1194             return index;
1195         }
1196     }
1197
1198     // Based on the first column index go to the previous row and calculate the nearest index
1199     // that is above the current index
1200     int previousRowIndex = firstColumnIndex - 1;
1201     int searchIndex = previousRowIndex;
1202     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1203     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1204         --searchIndex;
1205         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1206         if (searchDiff < minDiff) {
1207             minDiff = searchDiff;
1208             previousRowIndex = searchIndex;
1209         }
1210     }
1211
1212     return previousRowIndex;
1213 }
1214
1215 qreal KItemListController::keyboardAnchorPos(int index) const
1216 {
1217     const QRectF itemRect = m_view->itemRect(index);
1218     if (!itemRect.isEmpty()) {
1219         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1220     }
1221
1222     return 0;
1223 }
1224
1225 void KItemListController::updateExtendedSelectionRegion()
1226 {
1227     if (m_view) {
1228         const bool extend = (m_selectionBehavior != MultiSelection);
1229         KItemListStyleOption option = m_view->styleOption();
1230         if (option.extendedSelectionRegion != extend) {
1231             option.extendedSelectionRegion = extend;
1232             m_view->setStyleOption(option);
1233         }
1234     }
1235 }
1236
1237 #include "kitemlistcontroller.moc"