src/dolphindetailsview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz (peter.penz@gmx.at)                  *
   3  *   Copyright (C) 2008 by Simon St. James (kdedevel@etotheipiplusone.com) *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  19  ***************************************************************************/
  20
  21 #include "dolphindetailsview.h"
  22
  23 #include "dolphinmodel.h"
  24 #include "dolphincontroller.h"
  25 #include "dolphinfileitemdelegate.h"
  26 #include "settings/dolphinsettings.h"
  27 #include "dolphinsortfilterproxymodel.h"
  28 #include "dolphinviewautoscroller.h"
  29 #include "draganddrophelper.h"
  30 #include "viewextensionsfactory.h"
  31 #include "viewproperties.h"
  32 #include "zoomlevelinfo.h"
  33
  34 #include "dolphin_detailsmodesettings.h"
  35 #include "dolphin_generalsettings.h"
  36
  37 #include <kdirmodel.h>
  38 #include <klocale.h>
  39 #include <kmenu.h>
  40
  41 #include <QAction>
  42 #include <QApplication>
  43 #include <QHeaderView>
  44 #include <QRubberBand>
  45 #include <QPainter>
  46 #include <QScrollBar>
  47
  48 DolphinDetailsView::DolphinDetailsView(QWidget* parent,
  49                                        DolphinController* controller,
  50                                        DolphinSortFilterProxyModel* proxyModel) :
  51     QTreeView(parent),
  52     m_autoResize(true),
  53     m_expandingTogglePressed(false),
  54     m_keyPressed(false),
  55     m_useDefaultIndexAt(true),
  56     m_ignoreScrollTo(false),
  57     m_controller(controller),
  58     m_extensionsFactory(0),
  59     m_expandableFoldersAction(0),
  60     m_expandedUrls(),
  61     m_font(),
  62     m_decorationSize(),
  63     m_band()
  64 {
  65     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
  66     Q_ASSERT(settings != 0);
  67     Q_ASSERT(controller != 0);
  68
  69     setLayoutDirection(Qt::LeftToRight);
  70     setAcceptDrops(true);
  71     setSortingEnabled(true);
  72     setUniformRowHeights(true);
  73     setSelectionBehavior(SelectItems);
  74     setDragDropMode(QAbstractItemView::DragDrop);
  75     setDropIndicatorShown(false);
  76     setAlternatingRowColors(true);
  77     setRootIsDecorated(settings->expandableFolders());
  78     setItemsExpandable(settings->expandableFolders());
  79     setEditTriggers(QAbstractItemView::NoEditTriggers);
  80     setModel(proxyModel);
  81
  82     setMouseTracking(true);
  83
  84     const ViewProperties props(controller->url());
  85     setSortIndicatorSection(props.sorting());
  86     setSortIndicatorOrder(props.sortOrder());
  87
  88     QHeaderView* headerView = header();
  89     connect(headerView, SIGNAL(sectionClicked(int)),
  90             this, SLOT(synchronizeSortingState(int)));
  91     headerView->setContextMenuPolicy(Qt::CustomContextMenu);
  92     connect(headerView, SIGNAL(customContextMenuRequested(const QPoint&)),
  93             this, SLOT(configureSettings(const QPoint&)));
  94     connect(headerView, SIGNAL(sectionResized(int, int, int)),
  95             this, SLOT(slotHeaderSectionResized(int, int, int)));
  96     connect(headerView, SIGNAL(sectionHandleDoubleClicked(int)),
  97             this, SLOT(disableAutoResizing()));
  98
  99     connect(parent, SIGNAL(sortingChanged(DolphinView::Sorting)),
 100             this, SLOT(setSortIndicatorSection(DolphinView::Sorting)));
 101     connect(parent, SIGNAL(sortOrderChanged(Qt::SortOrder)),
 102             this, SLOT(setSortIndicatorOrder(Qt::SortOrder)));
 103
 104     connect(this, SIGNAL(clicked(const QModelIndex&)),
 105             controller, SLOT(requestTab(const QModelIndex&)));
 106     if (KGlobalSettings::singleClick()) {
 107         connect(this, SIGNAL(clicked(const QModelIndex&)),
 108                 controller, SLOT(triggerItem(const QModelIndex&)));
 109     } else {
 110         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 111                 controller, SLOT(triggerItem(const QModelIndex&)));
 112     }
 113
 114     connect(this, SIGNAL(entered(const QModelIndex&)),
 115             this, SLOT(slotEntered(const QModelIndex&)));
 116     connect(this, SIGNAL(viewportEntered()),
 117             controller, SLOT(emitViewportEntered()));
 118     connect(controller, SIGNAL(zoomLevelChanged(int)),
 119             this, SLOT(setZoomLevel(int)));
 120     connect(controller->dolphinView(), SIGNAL(additionalInfoChanged()),
 121             this, SLOT(updateColumnVisibility()));
 122     connect(controller, SIGNAL(activationChanged(bool)),
 123             this, SLOT(slotActivationChanged(bool)));
 124
 125     if (settings->useSystemFont()) {
 126         m_font = KGlobalSettings::generalFont();
 127     } else {
 128         m_font = QFont(settings->fontFamily(),
 129                        qRound(settings->fontSize()),
 130                        settings->fontWeight(),
 131                        settings->italicFont());
 132         m_font.setPointSizeF(settings->fontSize());
 133     }
 134
 135     setVerticalScrollMode(QTreeView::ScrollPerPixel);
 136     setHorizontalScrollMode(QTreeView::ScrollPerPixel);
 137
 138     const DolphinView* view = controller->dolphinView();
 139     connect(view, SIGNAL(showPreviewChanged()),
 140             this, SLOT(slotShowPreviewChanged()));
 141
 142
 143     setFocus();
 144     viewport()->installEventFilter(this);
 145
 146     connect(KGlobalSettings::self(), SIGNAL(settingsChanged(int)),
 147             this, SLOT(slotGlobalSettingsChanged(int)));
 148
 149     m_useDefaultIndexAt = false;
 150
 151     m_expandableFoldersAction = new QAction(i18nc("@option:check", "Expandable Folders"), this);
 152     m_expandableFoldersAction->setCheckable(true);
 153     connect(m_expandableFoldersAction, SIGNAL(toggled(bool)),
 154             this, SLOT(setFoldersExpandable(bool)));
 155
 156     connect(this, SIGNAL(expanded(const QModelIndex&)), this, SLOT(slotExpanded(const QModelIndex&)));
 157     connect(this, SIGNAL(collapsed(const QModelIndex&)), this, SLOT(slotCollapsed(const QModelIndex&)));
 158
 159     updateDecorationSize(view->showPreview());
 160
 161     m_extensionsFactory = new ViewExtensionsFactory(this, controller);
 162     m_extensionsFactory->fileItemDelegate()->setMinimizedNameColumn(true);
 163     m_extensionsFactory->setAutoFolderExpandingEnabled(settings->expandableFolders());
 164 }
 165
 166 DolphinDetailsView::~DolphinDetailsView()
 167 {
 168 }
 169
 170 QSet<KUrl> DolphinDetailsView::expandedUrls() const
 171 {
 172     return m_expandedUrls;
 173 }
 174
 175 QRegion DolphinDetailsView::visualRegionForSelection(const QItemSelection& selection) const
 176 {
 177     // We have to make sure that the visualRect of each model index is inside the region.
 178     // QTreeView::visualRegionForSelection does not do it right because it assumes implicitly
 179     // that all visualRects have the same width, which is in general not the case here.
 180     QRegion selectionRegion;
 181     const QModelIndexList indexes = selection.indexes();
 182
 183     foreach(const QModelIndex& index, indexes) {
 184         selectionRegion += visualRect(index);
 185     }
 186
 187     return selectionRegion;
 188 }
 189
 190 bool DolphinDetailsView::event(QEvent* event)
 191 {
 192     switch (event->type()) {
 193     case QEvent::Polish:
 194         header()->setResizeMode(QHeaderView::Interactive);
 195         updateColumnVisibility();
 196         break;
 197
 198     case QEvent::FocusOut:
 199         // If a key-press triggers an action that e. g. opens a dialog, the
 200         // widget gets no key-release event. Assure that the pressed state
 201         // is reset to prevent accidently setting the current index during a selection.
 202         m_keyPressed = false;
 203         break;
 204
 205     default:
 206         break;
 207     }
 208
 209     return QTreeView::event(event);
 210 }
 211
 212 QStyleOptionViewItem DolphinDetailsView::viewOptions() const
 213 {
 214     QStyleOptionViewItem viewOptions = QTreeView::viewOptions();
 215     viewOptions.font = m_font;
 216     viewOptions.fontMetrics = QFontMetrics(m_font);
 217     viewOptions.showDecorationSelected = true;
 218     viewOptions.decorationSize = m_decorationSize;
 219     return viewOptions;
 220 }
 221
 222 void DolphinDetailsView::contextMenuEvent(QContextMenuEvent* event)
 223 {
 224     QTreeView::contextMenuEvent(event);
 225
 226     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 227     m_expandableFoldersAction->setChecked(settings->expandableFolders());
 228     m_controller->triggerContextMenuRequest(event->pos(),
 229                                             QList<QAction*>() << m_expandableFoldersAction);
 230 }
 231
 232 void DolphinDetailsView::mousePressEvent(QMouseEvent* event)
 233 {
 234     m_controller->requestActivation();
 235
 236     const QModelIndex current = currentIndex();
 237     QTreeView::mousePressEvent(event);
 238
 239     m_expandingTogglePressed = isAboveExpandingToggle(event->pos());
 240
 241     const QModelIndex index = indexAt(event->pos());
 242     const bool updateState = index.isValid() &&
 243                              (index.column() == DolphinModel::Name) &&
 244                              (event->button() == Qt::LeftButton);
 245     if (updateState) {
 246         setState(QAbstractItemView::DraggingState);
 247     }
 248
 249     if (!index.isValid() || (index.column() != DolphinModel::Name)) {
 250         // the mouse press is done somewhere outside the filename column
 251         if (QApplication::mouseButtons() & Qt::MidButton) {
 252             m_controller->replaceUrlByClipboard();
 253         }
 254
 255         const Qt::KeyboardModifiers mod = QApplication::keyboardModifiers();
 256         if (!m_expandingTogglePressed && !(mod & Qt::ShiftModifier) && !(mod & Qt::ControlModifier)) {
 257             clearSelection();
 258         }
 259
 260         // restore the current index, other columns are handled as viewport area.
 261         // setCurrentIndex(...) implicitly calls scrollTo(...), which we want to ignore.
 262         m_ignoreScrollTo = true;
 263         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 264         m_ignoreScrollTo = false;
 265
 266         if ((event->button() == Qt::LeftButton) && !m_expandingTogglePressed) {
 267             // Inform Qt about what we are doing - otherwise it starts dragging items around!
 268             setState(DragSelectingState);
 269             m_band.show = true;
 270             // Incremental update data will not be useful - start from scratch.
 271             m_band.ignoreOldInfo = true;
 272             const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 273             m_band.origin = event->pos()  + scrollPos;
 274             m_band.destination = m_band.origin;
 275             m_band.originalSelection = selectionModel()->selection();
 276         }
 277     }
 278 }
 279
 280 void DolphinDetailsView::mouseMoveEvent(QMouseEvent* event)
 281 {
 282     if (m_expandingTogglePressed) {
 283         // Per default QTreeView starts either a selection or a drag operation when dragging
 284         // the expanding toggle button (Qt-issue - see TODO comment in DolphinIconsView::mousePressEvent()).
 285         // Turn off this behavior in Dolphin to stay predictable:
 286         setState(QAbstractItemView::NoState);
 287         return;
 288     }
 289
 290     if (m_band.show) {
 291         const QPoint mousePos = event->pos();
 292         const QModelIndex index = indexAt(mousePos);
 293         if (!index.isValid()) {
 294             // the destination of the selection rectangle is above the viewport. In this
 295             // case QTreeView does no selection at all, which is not the wanted behavior
 296             // in Dolphin -> select all items within the elastic band rectangle
 297             updateElasticBandSelection();
 298         }
 299
 300         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 301         // as the Qt-issue #199631 has been fixed.
 302         // QTreeView::mouseMoveEvent(event);
 303         QAbstractItemView::mouseMoveEvent(event);
 304         updateElasticBand();
 305     } else {
 306         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 307         // as the Qt-issue #199631 has been fixed.
 308         // QTreeView::mouseMoveEvent(event);
 309         QAbstractItemView::mouseMoveEvent(event);
 310     }
 311 }
 312
 313 void DolphinDetailsView::mouseReleaseEvent(QMouseEvent* event)
 314 {
 315     if (!m_expandingTogglePressed) {
 316         const QModelIndex index = indexAt(event->pos());
 317         if (index.isValid() && (index.column() == DolphinModel::Name)) {
 318             QTreeView::mouseReleaseEvent(event);
 319         } else {
 320             // don't change the current index if the cursor is released
 321             // above any other column than the name column, as the other
 322             // columns act as viewport
 323             const QModelIndex current = currentIndex();
 324             QTreeView::mouseReleaseEvent(event);
 325             selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 326         }
 327     }
 328     m_expandingTogglePressed = false;
 329
 330     if (m_band.show) {
 331         setState(NoState);
 332         updateElasticBand();
 333         m_band.show = false;
 334     }
 335 }
 336
 337 void DolphinDetailsView::startDrag(Qt::DropActions supportedActions)
 338 {
 339     DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 340     m_band.show = false;
 341 }
 342
 343 void DolphinDetailsView::dragEnterEvent(QDragEnterEvent* event)
 344 {
 345     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 346         event->acceptProposedAction();
 347     }
 348
 349     if (m_band.show) {
 350         updateElasticBand();
 351         m_band.show = false;
 352     }
 353 }
 354
 355 void DolphinDetailsView::dragLeaveEvent(QDragLeaveEvent* event)
 356 {
 357     QTreeView::dragLeaveEvent(event);
 358     setDirtyRegion(m_dropRect);
 359 }
 360
 361 void DolphinDetailsView::dragMoveEvent(QDragMoveEvent* event)
 362 {
 363     QTreeView::dragMoveEvent(event);
 364
 365     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 366     setDirtyRegion(m_dropRect);
 367     const QModelIndex index = indexAt(event->pos());
 368     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 369         const KFileItem item = m_controller->itemForIndex(index);
 370         if (!item.isNull() && item.isDir()) {
 371             m_dropRect = visualRect(index);
 372         } else {
 373             m_dropRect.setSize(QSize()); // set as invalid
 374         }
 375         setDirtyRegion(m_dropRect);
 376     }
 377
 378     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 379         // accept url drops, independently from the destination item
 380         event->acceptProposedAction();
 381     }
 382 }
 383
 384 void DolphinDetailsView::dropEvent(QDropEvent* event)
 385 {
 386     const QModelIndex index = indexAt(event->pos());
 387     KFileItem item;
 388     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 389         item = m_controller->itemForIndex(index);
 390     }
 391     m_controller->indicateDroppedUrls(item, m_controller->url(), event);
 392     QTreeView::dropEvent(event);
 393 }
 394
 395 void DolphinDetailsView::paintEvent(QPaintEvent* event)
 396 {
 397     QTreeView::paintEvent(event);
 398     if (m_band.show) {
 399         // The following code has been taken from QListView
 400         // and adapted to DolphinDetailsView.
 401         // (C) 1992-2007 Trolltech ASA
 402         QStyleOptionRubberBand opt;
 403         opt.initFrom(this);
 404         opt.shape = QRubberBand::Rectangle;
 405         opt.opaque = false;
 406         opt.rect = elasticBandRect();
 407
 408         QPainter painter(viewport());
 409         painter.save();
 410         style()->drawControl(QStyle::CE_RubberBand, &opt, &painter);
 411         painter.restore();
 412     }
 413 }
 414
 415 void DolphinDetailsView::keyPressEvent(QKeyEvent* event)
 416 {
 417     // If the Control modifier is pressed, a multiple selection
 418     // is done and DolphinDetailsView::currentChanged() may not
 419     // not change the selection in a custom way.
 420     m_keyPressed = !(event->modifiers() & Qt::ControlModifier);
 421
 422     QTreeView::keyPressEvent(event);
 423     m_controller->handleKeyPressEvent(event);
 424 }
 425
 426 void DolphinDetailsView::keyReleaseEvent(QKeyEvent* event)
 427 {
 428     QTreeView::keyReleaseEvent(event);
 429     m_keyPressed = false;
 430 }
 431
 432 void DolphinDetailsView::resizeEvent(QResizeEvent* event)
 433 {
 434     QTreeView::resizeEvent(event);
 435     if (m_autoResize) {
 436         resizeColumns();
 437     }
 438 }
 439
 440 void DolphinDetailsView::wheelEvent(QWheelEvent* event)
 441 {
 442     const int step = m_decorationSize.height();
 443     verticalScrollBar()->setSingleStep(step);
 444     QTreeView::wheelEvent(event);
 445 }
 446
 447 void DolphinDetailsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 448 {
 449     QTreeView::currentChanged(current, previous);
 450     m_extensionsFactory->handleCurrentIndexChange(current, previous);
 451
 452     // Stay consistent with QListView: When changing the current index by key presses,
 453     // also change the selection.
 454     if (m_keyPressed) {
 455         setCurrentIndex(current);
 456     }
 457 }
 458
 459 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 460 {
 461     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 462         // if the mouse is above an item and moved very fast outside the widget,
 463         // no viewportEntered() signal might be emitted although the mouse has been moved
 464         // above the viewport
 465         m_controller->emitViewportEntered();
 466     }
 467
 468     return QTreeView::eventFilter(watched, event);
 469 }
 470
 471 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 472 {
 473     // the blank portion of the name column counts as empty space
 474     const QModelIndex index = QTreeView::indexAt(point);
 475     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 476                                     (index.column() == KDirModel::Name) && !visualRect(index).contains(point);
 477     return isAboveEmptySpace ? QModelIndex() : index;
 478 }
 479
 480 QRect DolphinDetailsView::visualRect(const QModelIndex& index) const
 481 {
 482     QRect rect = QTreeView::visualRect(index);
 483     const KFileItem item = m_controller->itemForIndex(index);
 484     if (!item.isNull()) {
 485         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 486         rect.setWidth(width);
 487     }
 488
 489     return rect;
 490 }
 491
 492 void DolphinDetailsView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command)
 493 {
 494     // We must override setSelection() as Qt calls it internally and when this happens
 495     // we must ensure that the default indexAt() is used.
 496     if (!m_band.show) {
 497         m_useDefaultIndexAt = true;
 498         QTreeView::setSelection(rect, command);
 499         m_useDefaultIndexAt = false;
 500     } else {
 501         // Use our own elastic band selection algorithm
 502         updateElasticBandSelection();
 503     }
 504 }
 505
 506 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 507 {
 508     if (!m_ignoreScrollTo) {
 509         QTreeView::scrollTo(index, hint);
 510     }
 511 }
 512
 513 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 514 {
 515     header()->setSortIndicator(sorting, header()->sortIndicatorOrder());
 516 }
 517
 518 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 519 {
 520     header()->setSortIndicator(header()->sortIndicatorSection(), sortOrder);
 521 }
 522
 523 void DolphinDetailsView::synchronizeSortingState(int column)
 524 {
 525     // The sorting has already been changed in QTreeView if this slot is
 526     // invoked, but Dolphin is not informed about this.
 527     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 528     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 529     m_controller->indicateSortingChange(sorting);
 530     m_controller->indicateSortOrderChange(sortOrder);
 531 }
 532
 533 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 534 {
 535     if (index.column() == DolphinModel::Name) {
 536         m_controller->emitItemEntered(index);
 537     } else {
 538         m_controller->emitViewportEntered();
 539     }
 540 }
 541
 542 void DolphinDetailsView::updateElasticBand()
 543 {
 544     if (m_band.show) {
 545         QRect dirtyRegion(elasticBandRect());
 546         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 547         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 548         // Going above the (logical) top-left of the view causes complications during selection;
 549         // we may as well prevent it.
 550         if (m_band.destination.y() < 0) {
 551             m_band.destination.setY(0);
 552         }
 553         if (m_band.destination.x() < 0) {
 554             m_band.destination.setX(0);
 555         }
 556         dirtyRegion = dirtyRegion.united(elasticBandRect());
 557         setDirtyRegion(dirtyRegion);
 558     }
 559 }
 560
 561 QRect DolphinDetailsView::elasticBandRect() const
 562 {
 563     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 564
 565     const QPoint topLeft = m_band.origin - scrollPos;
 566     const QPoint bottomRight = m_band.destination - scrollPos;
 567     return QRect(topLeft, bottomRight).normalized();
 568 }
 569
 570 void DolphinDetailsView::setZoomLevel(int level)
 571 {
 572     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 573     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 574
 575     const bool showPreview = m_controller->dolphinView()->showPreview();
 576     if (showPreview) {
 577         settings->setPreviewSize(size);
 578     } else {
 579         settings->setIconSize(size);
 580     }
 581
 582     updateDecorationSize(showPreview);
 583 }
 584
 585 void DolphinDetailsView::slotShowPreviewChanged()
 586 {
 587     const DolphinView* view = m_controller->dolphinView();
 588     updateDecorationSize(view->showPreview());
 589 }
 590
 591 void DolphinDetailsView::configureSettings(const QPoint& pos)
 592 {
 593     KMenu popup(this);
 594     popup.addTitle(i18nc("@title:menu", "Columns"));
 595
 596     // add checkbox items for each column
 597     QHeaderView* headerView = header();
 598     const int columns = model()->columnCount();
 599     for (int i = 0; i < columns; ++i) {
 600         const int logicalIndex = headerView->logicalIndex(i);
 601         const QString text = model()->headerData(logicalIndex, Qt::Horizontal).toString();
 602         QAction* action = popup.addAction(text);
 603         action->setCheckable(true);
 604         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 605         action->setData(logicalIndex);
 606         action->setEnabled(logicalIndex != DolphinModel::Name);
 607     }
 608     popup.addSeparator();
 609
 610     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 611     if (activatedAction != 0) {
 612         const bool show = activatedAction->isChecked();
 613         const int columnIndex = activatedAction->data().toInt();
 614
 615         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 616         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 617         if (show) {
 618             Q_ASSERT(!list.contains(info));
 619             list.append(info);
 620         } else {
 621             Q_ASSERT(list.contains(info));
 622             const int index = list.indexOf(info);
 623             list.removeAt(index);
 624         }
 625
 626         m_controller->indicateAdditionalInfoChange(list);
 627         setColumnHidden(columnIndex, !show);
 628         resizeColumns();
 629     }
 630 }
 631
 632 void DolphinDetailsView::updateColumnVisibility()
 633 {
 634     QHeaderView* headerView = header();
 635     disconnect(headerView, SIGNAL(sectionMoved(int, int, int)),
 636                this, SLOT(saveColumnPositions()));
 637
 638     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 639     const QList<int> columnPositions = settings->columnPositions();
 640
 641     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 642     for (int i = DolphinModel::Name; i <= DolphinModel::Version; ++i) {
 643         const KFileItemDelegate::Information info = infoForColumn(i);
 644         const bool hide = !list.contains(info) && (i != DolphinModel::Name);
 645         if (isColumnHidden(i) != hide) {
 646             setColumnHidden(i, hide);
 647         }
 648
 649         const int from = headerView->visualIndex(i);
 650         headerView->moveSection(from, columnPositions[i]);
 651     }
 652
 653     resizeColumns();
 654
 655     connect(headerView, SIGNAL(sectionMoved(int, int, int)),
 656             this, SLOT(saveColumnPositions()));
 657
 658 }
 659
 660 void DolphinDetailsView::saveColumnPositions()
 661 {
 662     QList<int> columnPositions;
 663     for (int i = DolphinModel::Name; i <= DolphinModel::Version; ++i) {
 664         columnPositions.append(header()->visualIndex(i));
 665     }
 666
 667     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 668     settings->setColumnPositions(columnPositions);
 669 }
 670
 671 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 672 {
 673     Q_UNUSED(logicalIndex);
 674     Q_UNUSED(oldSize);
 675     Q_UNUSED(newSize);
 676     // If the user changes the size of the headers, the autoresize feature should be
 677     // turned off. As there is no dedicated interface to find out whether the header
 678     // section has been resized by the user or by a resize event, another approach is used.
 679     // Attention: Take care when changing the if-condition to verify that there is no
 680     // regression in combination with bug 178630 (see fix in comment #8).
 681     if ((QApplication::mouseButtons() & Qt::LeftButton) && header()->underMouse()) {
 682         disableAutoResizing();
 683     }
 684 }
 685
 686 void DolphinDetailsView::slotActivationChanged(bool active)
 687 {
 688     setAlternatingRowColors(active);
 689 }
 690
 691 void DolphinDetailsView::disableAutoResizing()
 692 {
 693     m_autoResize = false;
 694 }
 695
 696 void DolphinDetailsView::requestActivation()
 697 {
 698     m_controller->requestActivation();
 699 }
 700
 701 void DolphinDetailsView::slotGlobalSettingsChanged(int category)
 702 {
 703     Q_UNUSED(category);
 704
 705     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 706     Q_ASSERT(settings != 0);
 707     if (settings->useSystemFont()) {
 708         m_font = KGlobalSettings::generalFont();
 709     }
 710     //Disconnect then reconnect, since the settings have been changed, the connection requirements may have also.
 711     disconnect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 712     disconnect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 713     if (KGlobalSettings::singleClick()) {
 714         connect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 715     } else {
 716         connect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 717     }
 718 }
 719
 720 void DolphinDetailsView::updateElasticBandSelection()
 721 {
 722     if (!m_band.show) {
 723         return;
 724     }
 725
 726     // Ensure the elastic band itself is up-to-date, in
 727     // case we are being called due to e.g. a drag event.
 728     updateElasticBand();
 729
 730     // Clip horizontally to the name column, as some filenames will be
 731     // longer than the column.  We don't clip vertically as origin
 732     // may be above or below the current viewport area.
 733     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 734     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 735     QRect selRect = elasticBandRect().normalized();
 736     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 737     selRect = nameColumnArea.intersect(selRect).normalized();
 738     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 739     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 740     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 741
 742     if (selRect.isNull()) {
 743         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 744         m_band.ignoreOldInfo = true;
 745         return;
 746     }
 747
 748     if (!m_band.ignoreOldInfo) {
 749         // Do some quick checks to see if we can rule out the need to
 750         // update the selection.
 751         Q_ASSERT(uniformRowHeights());
 752         QModelIndex dummyIndex = model()->index(0, 0);
 753         if (!dummyIndex.isValid()) {
 754             // No items in the model presumably.
 755             return;
 756         }
 757
 758         // If the elastic band does not cover the same rows as before, we'll
 759         // need to re-check, and also invalidate the old item distances.
 760         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 761         const bool coveringSameRows =
 762             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 763             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 764         if (coveringSameRows) {
 765             // Covering the same rows, but have we moved far enough horizontally
 766             // that we might have (de)selected some other items?
 767             const bool itemSelectionChanged =
 768                 ((selRect.left() > oldSelRect.left()) &&
 769                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 770                 ((selRect.left() < oldSelRect.left()) &&
 771                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 772                 ((selRect.right() < oldSelRect.right()) &&
 773                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 774                 ((selRect.right() > oldSelRect.right()) &&
 775                  (selRect.right() >= m_band.outsideNearestRightEdge));
 776
 777             if (!itemSelectionChanged) {
 778                 return;
 779             }
 780         }
 781     } else {
 782         // This is the only piece of optimization data that needs to be explicitly
 783         // discarded.
 784         m_band.lastSelectionOrigin = QPoint();
 785         m_band.lastSelectionDestination = QPoint();
 786         oldSelRect = selRect;
 787     }
 788
 789     // Do the selection from scratch. Force a update of the horizontal distances info.
 790     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 791     m_band.insideNearestRightEdge  = nameColumnX - 1;
 792     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 793     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 794
 795     // Include the old selection rect as well, so we can deselect
 796     // items that were inside it but not in the new selRect.
 797     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 798     if (boundingRect.isNull()) {
 799         return;
 800     }
 801
 802     // Get the index of the item in this row in the name column.
 803     // TODO - would this still work if the columns could be re-ordered?
 804     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 805     if (startIndex.parent().isValid()) {
 806         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 807     } else {
 808         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 809     }
 810     if (!startIndex.isValid()) {
 811         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 812         m_band.ignoreOldInfo = true;
 813         return;
 814     }
 815
 816    // Go through all indexes between the top and bottom of boundingRect, and
 817    // update the selection.
 818    const int verticalCutoff = boundingRect.bottom();
 819    QModelIndex currIndex = startIndex;
 820    QModelIndex lastIndex;
 821    bool allItemsInBoundDone = false;
 822
 823    // Calling selectionModel()->select(...) for each item that needs to be
 824    // toggled is slow as each call emits selectionChanged(...) so store them
 825    // and do the selection toggle in one batch.
 826    QItemSelection itemsToToggle;
 827    // QItemSelection's deal with continuous ranges of indexes better than
 828    // single indexes, so try to portion items that need to be toggled into ranges.
 829    bool formingToggleIndexRange = false;
 830    QModelIndex toggleIndexRangeBegin = QModelIndex();
 831
 832    do {
 833        QRect currIndexRect = visualRect(currIndex);
 834
 835         // Update some optimization info as we go.
 836        const int cr = currIndexRect.right();
 837        const int cl = currIndexRect.left();
 838        const int sl = selRect.left();
 839        const int sr = selRect.right();
 840        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 841        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 842            m_band.outsideNearestLeftEdge = cr;
 843        }
 844        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 845            m_band.outsideNearestRightEdge = cl;
 846        }
 847        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 848            m_band.insideNearestRightEdge = cl;
 849        }
 850        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 851            m_band.insideNearestLeftEdge = cr;
 852        }
 853
 854        bool currentlySelected = selectionModel()->isSelected(currIndex);
 855        bool originallySelected = m_band.originalSelection.contains(currIndex);
 856        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 857        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 858        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 859        if (needToToggleItem && !formingToggleIndexRange) {
 860             toggleIndexRangeBegin = currIndex;
 861             formingToggleIndexRange = true;
 862        }
 863
 864        // NOTE: indexBelow actually walks up and down expanded trees for us.
 865        QModelIndex nextIndex = indexBelow(currIndex);
 866        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 867
 868        const bool commitToggleIndexRange = formingToggleIndexRange &&
 869                                            (!needToToggleItem ||
 870                                             allItemsInBoundDone ||
 871                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 872        if (commitToggleIndexRange) {
 873            formingToggleIndexRange = false;
 874             // If this is the last item in the bounds and it is also the beginning of a range,
 875             // don't toggle lastIndex - it will already have been dealt with.
 876            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 877                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 878            }
 879             // Need to start a new range immediately with currIndex?
 880            if (needToToggleItem) {
 881                toggleIndexRangeBegin = currIndex;
 882                formingToggleIndexRange = true;
 883            }
 884            if (allItemsInBoundDone && needToToggleItem) {
 885                 // Toggle the very last item in the bounds.
 886                itemsToToggle.select(currIndex, currIndex);
 887            }
 888        }
 889
 890        // next item
 891        lastIndex = currIndex;
 892        currIndex = nextIndex;
 893     } while (!allItemsInBoundDone);
 894
 895
 896     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 897
 898     m_band.lastSelectionOrigin = m_band.origin;
 899     m_band.lastSelectionDestination = m_band.destination;
 900     m_band.ignoreOldInfo = false;
 901 }
 902
 903 void DolphinDetailsView::setFoldersExpandable(bool expandable)
 904 {
 905     if (!expandable) {
 906         // collapse all expanded folders, as QTreeView::setItemsExpandable(false)
 907         // does not do this task
 908         const int rowCount = model()->rowCount();
 909         for (int row = 0; row < rowCount; ++row) {
 910             setExpanded(model()->index(row, 0), false);
 911         }
 912     }
 913     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 914     settings->setExpandableFolders(expandable);
 915     setRootIsDecorated(expandable);
 916     setItemsExpandable(expandable);
 917 }
 918
 919 void DolphinDetailsView::slotExpanded(const QModelIndex& index)
 920 {
 921     KFileItem item = m_controller->itemForIndex(index);
 922     if (!item.isNull()) {
 923         m_expandedUrls.insert(item.url());
 924     }
 925 }
 926
 927 void DolphinDetailsView::slotCollapsed(const QModelIndex& index)
 928 {
 929     KFileItem item = m_controller->itemForIndex(index);
 930     if (!item.isNull()) {
 931         m_expandedUrls.remove(item.url());
 932     }
 933 }
 934
 935 void DolphinDetailsView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
 936 {
 937     removeExpandedIndexes(parent, start, end);
 938     QTreeView::rowsAboutToBeRemoved(parent, start, end);
 939 }
 940
 941 void DolphinDetailsView::removeExpandedIndexes(const QModelIndex& parent, int start, int end)
 942 {
 943     if (m_expandedUrls.isEmpty()) {
 944         return;
 945     }
 946
 947     for (int row = start; row <= end; row++) {
 948         const QModelIndex index = model()->index(row, 0, parent);
 949         if (isExpanded(index)) {
 950             slotCollapsed(index);
 951             removeExpandedIndexes(index, 0, model()->rowCount(index) - 1);
 952         }
 953     }
 954 }
 955
 956 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 957 {
 958     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 959     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 960     setIconSize(QSize(iconSize, iconSize));
 961     m_decorationSize = QSize(iconSize, iconSize);
 962
 963     doItemsLayout();
 964 }
 965
 966 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 967 {
 968     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 969
 970     switch (columnIndex) {
 971     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 972     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 973     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 974     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 975     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 976     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 977     default: break;
 978     }
 979
 980     return info;
 981 }
 982
 983 void DolphinDetailsView::resizeColumns()
 984 {
 985     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 986     // around 3 seconds for each (!) resize operation when having > 10000 items).
 987     // This gets a problem especially when opening large directories, where several
 988     // resize operations are received for showing the currently available items during
 989     // loading (the application hangs around 20 seconds when loading > 10000 items).
 990
 991     QHeaderView* headerView = header();
 992     QFontMetrics fontMetrics(viewport()->font());
 993
 994     int columnWidth[DolphinModel::Version + 1];
 995     columnWidth[DolphinModel::Size] = fontMetrics.width("00000 Items");
 996     columnWidth[DolphinModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 997     columnWidth[DolphinModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 998     columnWidth[DolphinModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 999     columnWidth[DolphinModel::Group] = fontMetrics.width("xxxxxxxxxx");
1000     columnWidth[DolphinModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
1001     columnWidth[DolphinModel::Version] = fontMetrics.width("xxxxxxxx");
1002
1003     int requiredWidth = 0;
1004     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
1005         if (!isColumnHidden(i)) {
1006             columnWidth[i] += 20; // provide a default gap
1007             requiredWidth += columnWidth[i];
1008             headerView->resizeSection(i, columnWidth[i]);
1009         }
1010     }
1011
1012     // resize the name column in a way that the whole available width is used
1013     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
1014
1015     const int minNameWidth = 300;
1016     if (columnWidth[KDirModel::Name] < minNameWidth) {
1017         columnWidth[KDirModel::Name] = minNameWidth;
1018
1019         // It might be possible that the name column width can be
1020         // decreased without clipping any text. For performance
1021         // reasons the exact necessary width for full visible names is
1022         // only checked for up to 200 items:
1023         const int rowCount = model()->rowCount();
1024         if (rowCount > 0 && rowCount < 200) {
1025             const int nameWidth = sizeHintForColumn(DolphinModel::Name);
1026             if (nameWidth + requiredWidth <= viewport()->width()) {
1027                 columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
1028             } else if (nameWidth < minNameWidth) {
1029                 columnWidth[KDirModel::Name] = nameWidth;
1030             }
1031         }
1032     }
1033
1034     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
1035 }
1036
1037 bool DolphinDetailsView::isAboveExpandingToggle(const QPoint& pos) const
1038 {
1039     // QTreeView offers no public API to get the information whether an index has an
1040     // expanding toggle and what boundaries the toggle has. The following approach
1041     // also assumes a toggle for file items.
1042     if (itemsExpandable()) {
1043         const QModelIndex index = QTreeView::indexAt(pos);
1044         if (index.isValid() && (index.column() == KDirModel::Name)) {
1045             QRect rect = visualRect(index);
1046             const int toggleSize = rect.height();
1047             if (isRightToLeft()) {
1048                 rect.moveRight(rect.right());
1049             } else {
1050                 rect.moveLeft(rect.x() - toggleSize);
1051             }
1052             rect.setWidth(toggleSize);
1053
1054             QStyleOption opt;
1055             opt.initFrom(this);
1056             opt.rect = rect;
1057             rect = style()->subElementRect(QStyle::SE_TreeViewDisclosureItem, &opt, this);
1058
1059             return rect.contains(pos);
1060         }
1061     }
1062     return false;
1063 }
1064
1065 DolphinDetailsView::ElasticBand::ElasticBand() :
1066     show(false),
1067     origin(),
1068     destination(),
1069     lastSelectionOrigin(),
1070     lastSelectionDestination(),
1071     ignoreOldInfo(true),
1072     outsideNearestLeftEdge(0),
1073     outsideNearestRightEdge(0),
1074     insideNearestLeftEdge(0),
1075     insideNearestRightEdge(0)
1076 {
1077 }
1078
1079 #include "dolphindetailsview.moc"