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     KItemListWidget* oldHoveredWidget = hoveredWidget();
 749
 750     const QPointF pos = transform.map(event->pos());
 751     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 752
 753     if (oldHoveredWidget != newHoveredWidget) {
 754         m_autoActivationTimer->stop();
 755
 756         if (oldHoveredWidget) {
 757             oldHoveredWidget->setHovered(false);
 758             emit itemUnhovered(oldHoveredWidget->index());
 759         }
 760
 761         if (newHoveredWidget) {
 762             const int index = newHoveredWidget->index();
 763             if (m_model->supportsDropping(index)) {
 764                 newHoveredWidget->setHovered(true);
 765             }
 766             emit itemHovered(index);
 767
 768             if (m_autoActivationTimer->interval() >= 0) {
 769                 m_autoActivationTimer->setProperty("index", index);
 770                 m_autoActivationTimer->start();
 771             }
 772         }
 773     }
 774
 775     return false;
 776 }
 777
 778 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 779 {
 780     Q_UNUSED(transform)
 781     if (!m_view) {
 782         return false;
 783     }
 784
 785     m_autoActivationTimer->stop();
 786     m_view->setAutoScroll(false);
 787
 788     const QPointF pos = transform.map(event->pos());
 789     const int index = m_view->itemAt(pos);
 790     emit itemDropEvent(index, event);
 791
 792     return true;
 793 }
 794
 795 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 796 {
 797     Q_UNUSED(event);
 798     Q_UNUSED(transform);
 799     return false;
 800 }
 801
 802 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 803 {
 804     Q_UNUSED(transform);
 805     if (!m_model || !m_view) {
 806         return false;
 807     }
 808
 809     KItemListWidget* oldHoveredWidget = hoveredWidget();
 810     const QPointF pos = transform.map(event->pos());
 811     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 812
 813     if (oldHoveredWidget != newHoveredWidget) {
 814         if (oldHoveredWidget) {
 815             oldHoveredWidget->setHovered(false);
 816             emit itemUnhovered(oldHoveredWidget->index());
 817         }
 818
 819         if (newHoveredWidget) {
 820             newHoveredWidget->setHovered(true);
 821             emit itemHovered(newHoveredWidget->index());
 822         }
 823     }
 824
 825     return false;
 826 }
 827
 828 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 829 {
 830     Q_UNUSED(event);
 831     Q_UNUSED(transform);
 832
 833     if (!m_model || !m_view) {
 834         return false;
 835     }
 836
 837     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 838         if (widget->isHovered()) {
 839             widget->setHovered(false);
 840             emit itemUnhovered(widget->index());
 841         }
 842     }
 843     return false;
 844 }
 845
 846 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 847 {
 848     Q_UNUSED(event);
 849     Q_UNUSED(transform);
 850     return false;
 851 }
 852
 853 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 854 {
 855     Q_UNUSED(event);
 856     Q_UNUSED(transform);
 857     return false;
 858 }
 859
 860 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 861 {
 862     if (!event) {
 863         return false;
 864     }
 865
 866     switch (event->type()) {
 867     case QEvent::KeyPress:
 868         return keyPressEvent(static_cast<QKeyEvent*>(event));
 869     case QEvent::InputMethod:
 870         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 871     case QEvent::GraphicsSceneMousePress:
 872         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 873     case QEvent::GraphicsSceneMouseMove:
 874         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 875     case QEvent::GraphicsSceneMouseRelease:
 876         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 877     case QEvent::GraphicsSceneMouseDoubleClick:
 878         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 879     case QEvent::GraphicsSceneWheel:
 880          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 881     case QEvent::GraphicsSceneDragEnter:
 882         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 883     case QEvent::GraphicsSceneDragLeave:
 884         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 885     case QEvent::GraphicsSceneDragMove:
 886         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 887     case QEvent::GraphicsSceneDrop:
 888         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 889     case QEvent::GraphicsSceneHoverEnter:
 890         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 891     case QEvent::GraphicsSceneHoverMove:
 892         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 893     case QEvent::GraphicsSceneHoverLeave:
 894         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 895     case QEvent::GraphicsSceneResize:
 896         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 897     default:
 898         break;
 899     }
 900
 901     return false;
 902 }
 903
 904 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 905 {
 906     if (!m_view) {
 907         return;
 908     }
 909
 910     KItemListRubberBand* rubberBand = m_view->rubberBand();
 911     if (rubberBand->isActive()) {
 912         const qreal diff = current - previous;
 913         // TODO: Ideally just QCursor::pos() should be used as
 914         // new end-position but it seems there is no easy way
 915         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 916         // (... or I just missed an easy way to do the mapping)
 917         QPointF endPos = rubberBand->endPosition();
 918         if (m_view->scrollOrientation() == Qt::Vertical) {
 919             endPos.ry() += diff;
 920         } else {
 921             endPos.rx() += diff;
 922         }
 923
 924         rubberBand->setEndPosition(endPos);
 925     }
 926 }
 927
 928 void KItemListController::slotRubberBandChanged()
 929 {
 930     if (!m_view || !m_model || m_model->count() <= 0) {
 931         return;
 932     }
 933
 934     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 935     const QPointF startPos = rubberBand->startPosition();
 936     const QPointF endPos = rubberBand->endPosition();
 937     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 938
 939     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 940     if (scrollVertical) {
 941         rubberBandRect.translate(0, -m_view->scrollOffset());
 942     } else {
 943         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 944     }
 945
 946     if (!m_oldSelection.isEmpty()) {
 947         // Clear the old selection that was available before the rubberband has
 948         // been activated in case if no Shift- or Control-key are pressed
 949         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 950                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 951         if (!shiftOrControlPressed) {
 952             m_oldSelection.clear();
 953         }
 954     }
 955
 956     QSet<int> selectedItems;
 957
 958     // Select all visible items that intersect with the rubberband
 959     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 960         const int index = widget->index();
 961
 962         const QRectF widgetRect = m_view->itemRect(index);
 963         if (widgetRect.intersects(rubberBandRect)) {
 964             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 965             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 966             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 967                 selectedItems.insert(index);
 968             }
 969         }
 970     }
 971
 972     // Select all invisible items that intersect with the rubberband. Instead of
 973     // iterating all items only the area which might be touched by the rubberband
 974     // will be checked.
 975     const bool increaseIndex = scrollVertical ?
 976                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 977
 978     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 979     bool selectionFinished = false;
 980     do {
 981         const QRectF widgetRect = m_view->itemRect(index);
 982         if (widgetRect.intersects(rubberBandRect)) {
 983             selectedItems.insert(index);
 984         }
 985
 986         if (increaseIndex) {
 987             ++index;
 988             selectionFinished = (index >= m_model->count()) ||
 989                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 990                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 991         } else {
 992             --index;
 993             selectionFinished = (index < 0) ||
 994                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 995                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 996         }
 997     } while (!selectionFinished);
 998
 999     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1000         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1001         // Therefore, the new selection contains:
1002         // 1. All previously selected items which are not inside the rubberband, and
1003         // 2. all items inside the rubberband which have not been selected previously.
1004         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
1005     }
1006     else {
1007         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1008     }
1009 }
1010
1011 void KItemListController::startDragging()
1012 {
1013     if (!m_view || !m_model) {
1014         return;
1015     }
1016
1017     const QSet<int> selectedItems = m_selectionManager->selectedItems();
1018     if (selectedItems.isEmpty()) {
1019         return;
1020     }
1021
1022     QMimeData* data = m_model->createMimeData(selectedItems);
1023     if (!data) {
1024         return;
1025     }
1026
1027     // The created drag object will be owned and deleted
1028     // by QApplication::activeWindow().
1029     QDrag* drag = new QDrag(QApplication::activeWindow());
1030     drag->setMimeData(data);
1031
1032     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1033     drag->setPixmap(pixmap);
1034
1035     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1036 }
1037
1038 KItemListWidget* KItemListController::hoveredWidget() const
1039 {
1040     Q_ASSERT(m_view);
1041
1042     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1043         if (widget->isHovered()) {
1044             return widget;
1045         }
1046     }
1047
1048     return 0;
1049 }
1050
1051 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1052 {
1053     Q_ASSERT(m_view);
1054
1055     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1056         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1057
1058         const bool hovered = widget->contains(mappedPos) &&
1059                              !widget->expansionToggleRect().contains(mappedPos);
1060         if (hovered) {
1061             return widget;
1062         }
1063     }
1064
1065     return 0;
1066 }
1067
1068 void KItemListController::updateKeyboardAnchor()
1069 {
1070     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1071                              m_keyboardAnchorIndex < m_model->count() &&
1072                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1073     if (!validAnchor) {
1074         const int index = m_selectionManager->currentItem();
1075         m_keyboardAnchorIndex = index;
1076         m_keyboardAnchorPos = keyboardAnchorPos(index);
1077     }
1078 }
1079
1080 int KItemListController::nextRowIndex(int index) const
1081 {
1082     if (m_keyboardAnchorIndex < 0) {
1083         return index;
1084     }
1085
1086     const int maxIndex = m_model->count() - 1;
1087     if (index == maxIndex) {
1088         return index;
1089     }
1090
1091     // Calculate the index of the last column inside the row of the current index
1092     int lastColumnIndex = index;
1093     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1094         ++lastColumnIndex;
1095         if (lastColumnIndex >= maxIndex) {
1096             return index;
1097         }
1098     }
1099
1100     // Based on the last column index go to the next row and calculate the nearest index
1101     // that is below the current index
1102     int nextRowIndex = lastColumnIndex + 1;
1103     int searchIndex = nextRowIndex;
1104     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1105     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1106         ++searchIndex;
1107         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1108         if (searchDiff < minDiff) {
1109             minDiff = searchDiff;
1110             nextRowIndex = searchIndex;
1111         }
1112     }
1113
1114     return nextRowIndex;
1115 }
1116
1117 int KItemListController::previousRowIndex(int index) const
1118 {
1119     if (m_keyboardAnchorIndex < 0 || index == 0) {
1120         return index;
1121     }
1122
1123     // Calculate the index of the first column inside the row of the current index
1124     int firstColumnIndex = index;
1125     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1126         --firstColumnIndex;
1127         if (firstColumnIndex <= 0) {
1128             return index;
1129         }
1130     }
1131
1132     // Based on the first column index go to the previous row and calculate the nearest index
1133     // that is above the current index
1134     int previousRowIndex = firstColumnIndex - 1;
1135     int searchIndex = previousRowIndex;
1136     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1137     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1138         --searchIndex;
1139         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1140         if (searchDiff < minDiff) {
1141             minDiff = searchDiff;
1142             previousRowIndex = searchIndex;
1143         }
1144     }
1145
1146     return previousRowIndex;
1147 }
1148
1149 qreal KItemListController::keyboardAnchorPos(int index) const
1150 {
1151     const QRectF itemRect = m_view->itemRect(index);
1152     if (!itemRect.isEmpty()) {
1153         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1154     }
1155
1156     return 0;
1157 }
1158
1159 #include "kitemlistcontroller.moc"