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