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     if (m_pressedIndex >= 0) {
 458         emit itemPressed(m_pressedIndex, event->button());
 459     }
 460
 461     if (m_view->isAboveExpansionToggle(m_pressedIndex, m_pressedMousePos)) {
 462         m_selectionManager->endAnchoredSelection();
 463         m_selectionManager->setCurrentItem(m_pressedIndex);
 464         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 465         return true;
 466     }
 467
 468     m_selectionTogglePressed = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 469     if (m_selectionTogglePressed) {
 470         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 471         // The previous anchored selection has been finished already in
 472         // KItemListSelectionManager::setSelected(). We can safely change
 473         // the current item and start a new anchored selection now.
 474         m_selectionManager->setCurrentItem(m_pressedIndex);
 475         m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 476         return true;
 477     }
 478
 479     const bool shiftPressed = event->modifiers() & Qt::ShiftModifier;
 480     const bool controlPressed = event->modifiers() & Qt::ControlModifier;
 481
 482     // The previous selection is cleared if either
 483     // 1. The selection mode is SingleSelection, or
 484     // 2. the selection mode is MultiSelection, and *none* of the following conditions are met:
 485     //    a) Shift or Control are pressed.
 486     //    b) The clicked item is selected already. In that case, the user might want to:
 487     //       - start dragging multiple items, or
 488     //       - open the context menu and perform an action for all selected items.
 489     const bool shiftOrControlPressed = shiftPressed || controlPressed;
 490     const bool pressedItemAlreadySelected = m_pressedIndex >= 0 && m_selectionManager->isSelected(m_pressedIndex);
 491     const bool clearSelection = m_selectionBehavior == SingleSelection ||
 492                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
 493     if (clearSelection) {
 494         m_selectionManager->clearSelection();
 495     } else if (pressedItemAlreadySelected && !shiftOrControlPressed && (event->buttons() & Qt::LeftButton)) {
 496         // The user might want to start dragging multiple items, but if he clicks the item
 497         // in order to trigger it instead, the other selected items must be deselected.
 498         // However, we do not know yet what the user is going to do.
 499         // -> remember that the user pressed an item which had been selected already and
 500         //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
 501         m_clearSelectionIfItemsAreNotDragged = true;
 502     }
 503
 504     if (!shiftPressed) {
 505         // Finish the anchored selection before the current index is changed
 506         m_selectionManager->endAnchoredSelection();
 507     }
 508
 509     if (m_pressedIndex >= 0) {
 510         m_selectionManager->setCurrentItem(m_pressedIndex);
 511
 512         switch (m_selectionBehavior) {
 513         case NoSelection:
 514             break;
 515
 516         case SingleSelection:
 517             m_selectionManager->setSelected(m_pressedIndex);
 518             break;
 519
 520         case MultiSelection:
 521             if (controlPressed) {
 522                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 523                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 524             } else if (!shiftPressed || !m_selectionManager->isAnchoredSelectionActive()) {
 525                 // Select the pressed item and start a new anchored selection
 526                 m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 527                 m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 528             }
 529             break;
 530
 531         default:
 532             Q_ASSERT(false);
 533             break;
 534         }
 535
 536         if (event->buttons() & Qt::RightButton) {
 537             emit itemContextMenuRequested(m_pressedIndex, event->screenPos());
 538         }
 539
 540         return true;
 541     }
 542
 543     if (event->buttons() & Qt::RightButton) {
 544         const QRectF headerBounds = m_view->headerBoundaries();
 545         if (headerBounds.contains(event->pos())) {
 546             emit headerContextMenuRequested(event->screenPos());
 547         } else {
 548             emit viewContextMenuRequested(event->screenPos());
 549         }
 550         return true;
 551     }
 552
 553     if (m_selectionBehavior == MultiSelection) {
 554         QPointF startPos = m_pressedMousePos;
 555         if (m_view->scrollOrientation() == Qt::Vertical) {
 556             startPos.ry() += m_view->scrollOffset();
 557             if (m_view->itemSize().width() < 0) {
 558                 // Use a special rubberband for views that have only one column and
 559                 // expand the rubberband to use the whole width of the view.
 560                 startPos.setX(0);
 561             }
 562         } else {
 563             startPos.rx() += m_view->scrollOffset();
 564         }
 565
 566         m_oldSelection = m_selectionManager->selectedItems();
 567         KItemListRubberBand* rubberBand = m_view->rubberBand();
 568         rubberBand->setStartPosition(startPos);
 569         rubberBand->setEndPosition(startPos);
 570         rubberBand->setActive(true);
 571         connect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 572         m_view->setAutoScroll(true);
 573     }
 574
 575     return false;
 576 }
 577
 578 bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 579 {
 580     if (!m_view) {
 581         return false;
 582     }
 583
 584     if (m_pressedIndex >= 0) {
 585         // Check whether a dragging should be started
 586         if (event->buttons() & Qt::LeftButton) {
 587             const QPointF pos = transform.map(event->pos());
 588             if ((pos - m_pressedMousePos).manhattanLength() >= QApplication::startDragDistance()) {
 589                 if (!m_selectionManager->isSelected(m_pressedIndex)) {
 590                     // Always assure that the dragged item gets selected. Usually this is already
 591                     // done on the mouse-press event, but when using the selection-toggle on a
 592                     // selected item the dragged item is not selected yet.
 593                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 594                 } else {
 595                     // A selected item has been clicked to drag all selected items
 596                     // -> the selection should not be cleared when the mouse button is released.
 597                     m_clearSelectionIfItemsAreNotDragged = false;
 598                 }
 599
 600                 startDragging();
 601             }
 602         }
 603     } else {
 604         KItemListRubberBand* rubberBand = m_view->rubberBand();
 605         if (rubberBand->isActive()) {
 606             QPointF endPos = transform.map(event->pos());
 607
 608             // Update the current item.
 609             const int newCurrent = m_view->itemAt(endPos);
 610             if (newCurrent >= 0) {
 611                 // It's expected that the new current index is also the new anchor (bug 163451).
 612                 m_selectionManager->endAnchoredSelection();
 613                 m_selectionManager->setCurrentItem(newCurrent);
 614                 m_selectionManager->beginAnchoredSelection(newCurrent);
 615             }
 616
 617             if (m_view->scrollOrientation() == Qt::Vertical) {
 618                 endPos.ry() += m_view->scrollOffset();
 619                 if (m_view->itemSize().width() < 0) {
 620                     // Use a special rubberband for views that have only one column and
 621                     // expand the rubberband to use the whole width of the view.
 622                     endPos.setX(m_view->size().width());
 623                 }
 624             } else {
 625                 endPos.rx() += m_view->scrollOffset();
 626             }
 627             rubberBand->setEndPosition(endPos);
 628         }
 629     }
 630
 631     return false;
 632 }
 633
 634 bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 635 {
 636     if (!m_view) {
 637         return false;
 638     }
 639
 640     if (m_pressedIndex >= 0) {
 641         emit itemReleased(m_pressedIndex, event->button());
 642     }
 643
 644     const bool isAboveSelectionToggle = m_view->isAboveSelectionToggle(m_pressedIndex, m_pressedMousePos);
 645     if (isAboveSelectionToggle) {
 646         m_selectionTogglePressed = false;
 647         return true;
 648     }
 649
 650     if (!isAboveSelectionToggle && m_selectionTogglePressed) {
 651         m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
 652         m_selectionTogglePressed = false;
 653         return true;
 654     }
 655
 656     const bool shiftOrControlPressed = event->modifiers() & Qt::ShiftModifier ||
 657                                        event->modifiers() & Qt::ControlModifier;
 658
 659     KItemListRubberBand* rubberBand = m_view->rubberBand();
 660     if (rubberBand->isActive()) {
 661         disconnect(rubberBand, SIGNAL(endPositionChanged(QPointF,QPointF)), this, SLOT(slotRubberBandChanged()));
 662         rubberBand->setActive(false);
 663         m_oldSelection.clear();
 664         m_view->setAutoScroll(false);
 665     }
 666
 667     const QPointF pos = transform.map(event->pos());
 668     const int index = m_view->itemAt(pos);
 669
 670     if (index >= 0 && index == m_pressedIndex) {
 671         // The release event is done above the same item as the press event
 672
 673         if (m_clearSelectionIfItemsAreNotDragged) {
 674             // A selected item has been clicked, but no drag operation has been started
 675             // -> clear the rest of the selection.
 676             m_selectionManager->clearSelection();
 677             m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
 678             m_selectionManager->beginAnchoredSelection(m_pressedIndex);
 679         }
 680
 681         if (event->button() & Qt::LeftButton) {
 682             bool emitItemActivated = true;
 683             if (m_view->isAboveExpansionToggle(index, pos)) {
 684                 const bool expanded = m_model->isExpanded(index);
 685                 m_model->setExpanded(index, !expanded);
 686
 687                 emit itemExpansionToggleClicked(index);
 688                 emitItemActivated = false;
 689             } else if (shiftOrControlPressed) {
 690                 // The mouse click should only update the selection, not trigger the item
 691                 emitItemActivated = false;
 692             } else if (!m_singleClickActivation) {
 693                 emitItemActivated = false;
 694             }
 695             if (emitItemActivated) {
 696                 emit itemActivated(index);
 697             }
 698         } else if (event->button() & Qt::MidButton) {
 699             emit itemMiddleClicked(index);
 700         }
 701     }
 702
 703     m_pressedMousePos = QPointF();
 704     m_pressedIndex = -1;
 705     m_clearSelectionIfItemsAreNotDragged = false;
 706     return false;
 707 }
 708
 709 bool KItemListController::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform)
 710 {
 711     const QPointF pos = transform.map(event->pos());
 712     const int index = m_view->itemAt(pos);
 713
 714     bool emitItemActivated = !m_singleClickActivation &&
 715                              (event->button() & Qt::LeftButton) &&
 716                              index >= 0 && index < m_model->count();
 717     if (emitItemActivated) {
 718         emit itemActivated(index);
 719     }
 720     return false;
 721 }
 722
 723 bool KItemListController::dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 724 {
 725     Q_UNUSED(event);
 726     Q_UNUSED(transform);
 727     return false;
 728 }
 729
 730 bool KItemListController::dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 731 {
 732     Q_UNUSED(event);
 733     Q_UNUSED(transform);
 734
 735     KItemListWidget* widget = hoveredWidget();
 736     if (widget) {
 737         widget->setHovered(false);
 738         emit itemUnhovered(widget->index());
 739     }
 740     return false;
 741 }
 742
 743 bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 744 {
 745     Q_UNUSED(transform);
 746     if (!m_model || !m_view) {
 747         return false;
 748     }
 749
 750     KItemListWidget* oldHoveredWidget = hoveredWidget();
 751
 752     const QPointF pos = transform.map(event->pos());
 753     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 754
 755     if (oldHoveredWidget != newHoveredWidget) {
 756         m_autoActivationTimer->stop();
 757
 758         if (oldHoveredWidget) {
 759             oldHoveredWidget->setHovered(false);
 760             emit itemUnhovered(oldHoveredWidget->index());
 761         }
 762
 763         if (newHoveredWidget) {
 764             const int index = newHoveredWidget->index();
 765             if (m_model->supportsDropping(index)) {
 766                 newHoveredWidget->setHovered(true);
 767             }
 768             emit itemHovered(index);
 769
 770             if (m_autoActivationTimer->interval() >= 0) {
 771                 m_autoActivationTimer->setProperty("index", index);
 772                 m_autoActivationTimer->start();
 773             }
 774         }
 775     }
 776
 777     return false;
 778 }
 779
 780 bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform)
 781 {
 782     Q_UNUSED(transform)
 783     if (!m_view) {
 784         return false;
 785     }
 786
 787     m_autoActivationTimer->stop();
 788
 789     const QPointF pos = transform.map(event->pos());
 790     const int index = m_view->itemAt(pos);
 791     emit itemDropEvent(index, event);
 792
 793     return true;
 794 }
 795
 796 bool KItemListController::hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 797 {
 798     Q_UNUSED(event);
 799     Q_UNUSED(transform);
 800     return false;
 801 }
 802
 803 bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 804 {
 805     Q_UNUSED(transform);
 806     if (!m_model || !m_view) {
 807         return false;
 808     }
 809
 810     KItemListWidget* oldHoveredWidget = hoveredWidget();
 811     const QPointF pos = transform.map(event->pos());
 812     KItemListWidget* newHoveredWidget = widgetForPos(pos);
 813
 814     if (oldHoveredWidget != newHoveredWidget) {
 815         if (oldHoveredWidget) {
 816             oldHoveredWidget->setHovered(false);
 817             emit itemUnhovered(oldHoveredWidget->index());
 818         }
 819
 820         if (newHoveredWidget) {
 821             newHoveredWidget->setHovered(true);
 822             emit itemHovered(newHoveredWidget->index());
 823         }
 824     }
 825
 826     return false;
 827 }
 828
 829 bool KItemListController::hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform)
 830 {
 831     Q_UNUSED(event);
 832     Q_UNUSED(transform);
 833
 834     if (!m_model || !m_view) {
 835         return false;
 836     }
 837
 838     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 839         if (widget->isHovered()) {
 840             widget->setHovered(false);
 841             emit itemUnhovered(widget->index());
 842         }
 843     }
 844     return false;
 845 }
 846
 847 bool KItemListController::wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform)
 848 {
 849     Q_UNUSED(event);
 850     Q_UNUSED(transform);
 851     return false;
 852 }
 853
 854 bool KItemListController::resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform)
 855 {
 856     Q_UNUSED(event);
 857     Q_UNUSED(transform);
 858     return false;
 859 }
 860
 861 bool KItemListController::processEvent(QEvent* event, const QTransform& transform)
 862 {
 863     if (!event) {
 864         return false;
 865     }
 866
 867     switch (event->type()) {
 868     case QEvent::KeyPress:
 869         return keyPressEvent(static_cast<QKeyEvent*>(event));
 870     case QEvent::InputMethod:
 871         return inputMethodEvent(static_cast<QInputMethodEvent*>(event));
 872     case QEvent::GraphicsSceneMousePress:
 873         return mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 874     case QEvent::GraphicsSceneMouseMove:
 875         return mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 876     case QEvent::GraphicsSceneMouseRelease:
 877         return mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 878     case QEvent::GraphicsSceneMouseDoubleClick:
 879         return mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent*>(event), QTransform());
 880     case QEvent::GraphicsSceneWheel:
 881          return wheelEvent(static_cast<QGraphicsSceneWheelEvent*>(event), QTransform());
 882     case QEvent::GraphicsSceneDragEnter:
 883         return dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 884     case QEvent::GraphicsSceneDragLeave:
 885         return dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 886     case QEvent::GraphicsSceneDragMove:
 887         return dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 888     case QEvent::GraphicsSceneDrop:
 889         return dropEvent(static_cast<QGraphicsSceneDragDropEvent*>(event), QTransform());
 890     case QEvent::GraphicsSceneHoverEnter:
 891         return hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 892     case QEvent::GraphicsSceneHoverMove:
 893         return hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 894     case QEvent::GraphicsSceneHoverLeave:
 895         return hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event), QTransform());
 896     case QEvent::GraphicsSceneResize:
 897         return resizeEvent(static_cast<QGraphicsSceneResizeEvent*>(event), transform);
 898     default:
 899         break;
 900     }
 901
 902     return false;
 903 }
 904
 905 void KItemListController::slotViewScrollOffsetChanged(qreal current, qreal previous)
 906 {
 907     if (!m_view) {
 908         return;
 909     }
 910
 911     KItemListRubberBand* rubberBand = m_view->rubberBand();
 912     if (rubberBand->isActive()) {
 913         const qreal diff = current - previous;
 914         // TODO: Ideally just QCursor::pos() should be used as
 915         // new end-position but it seems there is no easy way
 916         // to have something like QWidget::mapFromGlobal() for QGraphicsWidget
 917         // (... or I just missed an easy way to do the mapping)
 918         QPointF endPos = rubberBand->endPosition();
 919         if (m_view->scrollOrientation() == Qt::Vertical) {
 920             endPos.ry() += diff;
 921         } else {
 922             endPos.rx() += diff;
 923         }
 924
 925         rubberBand->setEndPosition(endPos);
 926     }
 927 }
 928
 929 void KItemListController::slotRubberBandChanged()
 930 {
 931     if (!m_view || !m_model || m_model->count() <= 0) {
 932         return;
 933     }
 934
 935     const KItemListRubberBand* rubberBand = m_view->rubberBand();
 936     const QPointF startPos = rubberBand->startPosition();
 937     const QPointF endPos = rubberBand->endPosition();
 938     QRectF rubberBandRect = QRectF(startPos, endPos).normalized();
 939
 940     const bool scrollVertical = (m_view->scrollOrientation() == Qt::Vertical);
 941     if (scrollVertical) {
 942         rubberBandRect.translate(0, -m_view->scrollOffset());
 943     } else {
 944         rubberBandRect.translate(-m_view->scrollOffset(), 0);
 945     }
 946
 947     if (!m_oldSelection.isEmpty()) {
 948         // Clear the old selection that was available before the rubberband has
 949         // been activated in case if no Shift- or Control-key are pressed
 950         const bool shiftOrControlPressed = QApplication::keyboardModifiers() & Qt::ShiftModifier ||
 951                                            QApplication::keyboardModifiers() & Qt::ControlModifier;
 952         if (!shiftOrControlPressed) {
 953             m_oldSelection.clear();
 954         }
 955     }
 956
 957     QSet<int> selectedItems;
 958
 959     // Select all visible items that intersect with the rubberband
 960     foreach (const KItemListWidget* widget, m_view->visibleItemListWidgets()) {
 961         const int index = widget->index();
 962
 963         const QRectF widgetRect = m_view->itemRect(index);
 964         if (widgetRect.intersects(rubberBandRect)) {
 965             const QRectF iconRect = widget->iconRect().translated(widgetRect.topLeft());
 966             const QRectF textRect = widget->textRect().translated(widgetRect.topLeft());
 967             if (iconRect.intersects(rubberBandRect) || textRect.intersects(rubberBandRect)) {
 968                 selectedItems.insert(index);
 969             }
 970         }
 971     }
 972
 973     // Select all invisible items that intersect with the rubberband. Instead of
 974     // iterating all items only the area which might be touched by the rubberband
 975     // will be checked.
 976     const bool increaseIndex = scrollVertical ?
 977                                startPos.y() > endPos.y(): startPos.x() > endPos.x();
 978
 979     int index = increaseIndex ? m_view->lastVisibleIndex() + 1 : m_view->firstVisibleIndex() - 1;
 980     bool selectionFinished = false;
 981     do {
 982         const QRectF widgetRect = m_view->itemRect(index);
 983         if (widgetRect.intersects(rubberBandRect)) {
 984             selectedItems.insert(index);
 985         }
 986
 987         if (increaseIndex) {
 988             ++index;
 989             selectionFinished = (index >= m_model->count()) ||
 990                                 ( scrollVertical && widgetRect.top()  > rubberBandRect.bottom()) ||
 991                                 (!scrollVertical && widgetRect.left() > rubberBandRect.right());
 992         } else {
 993             --index;
 994             selectionFinished = (index < 0) ||
 995                                 ( scrollVertical && widgetRect.bottom() < rubberBandRect.top()) ||
 996                                 (!scrollVertical && widgetRect.right()  < rubberBandRect.left());
 997         }
 998     } while (!selectionFinished);
 999
1000     if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
1001         // If Control is pressed, the selection state of all items in the rubberband is toggled.
1002         // Therefore, the new selection contains:
1003         // 1. All previously selected items which are not inside the rubberband, and
1004         // 2. all items inside the rubberband which have not been selected previously.
1005         m_selectionManager->setSelectedItems((m_oldSelection - selectedItems) + (selectedItems - m_oldSelection));
1006     }
1007     else {
1008         m_selectionManager->setSelectedItems(selectedItems + m_oldSelection);
1009     }
1010 }
1011
1012 void KItemListController::startDragging()
1013 {
1014     if (!m_view || !m_model) {
1015         return;
1016     }
1017
1018     const QSet<int> selectedItems = m_selectionManager->selectedItems();
1019     if (selectedItems.isEmpty()) {
1020         return;
1021     }
1022
1023     QMimeData* data = m_model->createMimeData(selectedItems);
1024     if (!data) {
1025         return;
1026     }
1027
1028     // The created drag object will be owned and deleted
1029     // by QApplication::activeWindow().
1030     QDrag* drag = new QDrag(QApplication::activeWindow());
1031     drag->setMimeData(data);
1032
1033     const QPixmap pixmap = m_view->createDragPixmap(selectedItems);
1034     drag->setPixmap(pixmap);
1035
1036     drag->exec(Qt::MoveAction | Qt::CopyAction | Qt::LinkAction, Qt::CopyAction);
1037 }
1038
1039 KItemListWidget* KItemListController::hoveredWidget() const
1040 {
1041     Q_ASSERT(m_view);
1042
1043     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1044         if (widget->isHovered()) {
1045             return widget;
1046         }
1047     }
1048
1049     return 0;
1050 }
1051
1052 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
1053 {
1054     Q_ASSERT(m_view);
1055
1056     foreach (KItemListWidget* widget, m_view->visibleItemListWidgets()) {
1057         const QPointF mappedPos = widget->mapFromItem(m_view, pos);
1058
1059         const bool hovered = widget->contains(mappedPos) &&
1060                              !widget->expansionToggleRect().contains(mappedPos);
1061         if (hovered) {
1062             return widget;
1063         }
1064     }
1065
1066     return 0;
1067 }
1068
1069 void KItemListController::updateKeyboardAnchor()
1070 {
1071     const bool validAnchor = m_keyboardAnchorIndex >= 0 &&
1072                              m_keyboardAnchorIndex < m_model->count() &&
1073                              keyboardAnchorPos(m_keyboardAnchorIndex) == m_keyboardAnchorPos;
1074     if (!validAnchor) {
1075         const int index = m_selectionManager->currentItem();
1076         m_keyboardAnchorIndex = index;
1077         m_keyboardAnchorPos = keyboardAnchorPos(index);
1078     }
1079 }
1080
1081 int KItemListController::nextRowIndex(int index) const
1082 {
1083     if (m_keyboardAnchorIndex < 0) {
1084         return index;
1085     }
1086
1087     const int maxIndex = m_model->count() - 1;
1088     if (index == maxIndex) {
1089         return index;
1090     }
1091
1092     // Calculate the index of the last column inside the row of the current index
1093     int lastColumnIndex = index;
1094     while (keyboardAnchorPos(lastColumnIndex + 1) > keyboardAnchorPos(lastColumnIndex)) {
1095         ++lastColumnIndex;
1096         if (lastColumnIndex >= maxIndex) {
1097             return index;
1098         }
1099     }
1100
1101     // Based on the last column index go to the next row and calculate the nearest index
1102     // that is below the current index
1103     int nextRowIndex = lastColumnIndex + 1;
1104     int searchIndex = nextRowIndex;
1105     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(nextRowIndex));
1106     while (searchIndex < maxIndex && keyboardAnchorPos(searchIndex + 1) > keyboardAnchorPos(searchIndex)) {
1107         ++searchIndex;
1108         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1109         if (searchDiff < minDiff) {
1110             minDiff = searchDiff;
1111             nextRowIndex = searchIndex;
1112         }
1113     }
1114
1115     return nextRowIndex;
1116 }
1117
1118 int KItemListController::previousRowIndex(int index) const
1119 {
1120     if (m_keyboardAnchorIndex < 0 || index == 0) {
1121         return index;
1122     }
1123
1124     // Calculate the index of the first column inside the row of the current index
1125     int firstColumnIndex = index;
1126     while (keyboardAnchorPos(firstColumnIndex - 1) < keyboardAnchorPos(firstColumnIndex)) {
1127         --firstColumnIndex;
1128         if (firstColumnIndex <= 0) {
1129             return index;
1130         }
1131     }
1132
1133     // Based on the first column index go to the previous row and calculate the nearest index
1134     // that is above the current index
1135     int previousRowIndex = firstColumnIndex - 1;
1136     int searchIndex = previousRowIndex;
1137     qreal minDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(previousRowIndex));
1138     while (searchIndex > 0 && keyboardAnchorPos(searchIndex - 1) < keyboardAnchorPos(searchIndex)) {
1139         --searchIndex;
1140         const qreal searchDiff = qAbs(m_keyboardAnchorPos - keyboardAnchorPos(searchIndex));
1141         if (searchDiff < minDiff) {
1142             minDiff = searchDiff;
1143             previousRowIndex = searchIndex;
1144         }
1145     }
1146
1147     return previousRowIndex;
1148 }
1149
1150 qreal KItemListController::keyboardAnchorPos(int index) const
1151 {
1152     const QRectF itemRect = m_view->itemRect(index);
1153     if (!itemRect.isEmpty()) {
1154         return (m_view->scrollOrientation() == Qt::Vertical) ? itemRect.x() : itemRect.y();
1155     }
1156
1157     return 0;
1158 }
1159
1160 #include "kitemlistcontroller.moc"