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