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