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