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