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