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 "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(configureColumns(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 pos = contentsPos();
 240             const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 241             m_band.origin = event->pos() + pos + scrollPos;
 242             m_band.destination = m_band.origin;
 243             m_band.originalSelection = selectionModel()->selection();
 244         }
 245     }
 246 }
 247
 248 void DolphinDetailsView::mouseMoveEvent(QMouseEvent* event)
 249 {
 250     if (m_band.show) {
 251         const QPoint mousePos = event->pos();
 252         const QModelIndex index = indexAt(mousePos);
 253         if (!index.isValid()) {
 254             // the destination of the selection rectangle is above the viewport. In this
 255             // case QTreeView does no selection at all, which is not the wanted behavior
 256             // in Dolphin -> select all items within the elastic band rectangle
 257             updateElasticBandSelection();
 258         }
 259
 260         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 261         // as the Qt-issue #199631 has been fixed.
 262         // QTreeView::mouseMoveEvent(event);
 263         QAbstractItemView::mouseMoveEvent(event);
 264         updateElasticBand();
 265     } else {
 266         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 267         // as the Qt-issue #199631 has been fixed.
 268         // QTreeView::mouseMoveEvent(event);
 269         QAbstractItemView::mouseMoveEvent(event);
 270     }
 271
 272     if (m_expandingTogglePressed) {
 273         // Per default QTreeView starts either a selection or a drag operation when dragging
 274         // the expanding toggle button (Qt-issue - see TODO comment in DolphinIconsView::mousePressEvent()).
 275         // Turn off this behavior in Dolphin to stay predictable:
 276         clearSelection();
 277         setState(QAbstractItemView::NoState);
 278     }
 279 }
 280
 281 void DolphinDetailsView::mouseReleaseEvent(QMouseEvent* event)
 282 {
 283     const QModelIndex index = indexAt(event->pos());
 284     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 285         QTreeView::mouseReleaseEvent(event);
 286     } else {
 287         // don't change the current index if the cursor is released
 288         // above any other column than the name column, as the other
 289         // columns act as viewport
 290         const QModelIndex current = currentIndex();
 291         QTreeView::mouseReleaseEvent(event);
 292         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 293     }
 294
 295     m_expandingTogglePressed = false;
 296     if (m_band.show) {
 297         setState(NoState);
 298         updateElasticBand();
 299         m_band.show = false;
 300     }
 301 }
 302
 303 void DolphinDetailsView::startDrag(Qt::DropActions supportedActions)
 304 {
 305     DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 306     m_band.show = false;
 307 }
 308
 309 void DolphinDetailsView::dragEnterEvent(QDragEnterEvent* event)
 310 {
 311     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 312         event->acceptProposedAction();
 313     }
 314
 315     if (m_band.show) {
 316         updateElasticBand();
 317         m_band.show = false;
 318     }
 319 }
 320
 321 void DolphinDetailsView::dragLeaveEvent(QDragLeaveEvent* event)
 322 {
 323     QTreeView::dragLeaveEvent(event);
 324     setDirtyRegion(m_dropRect);
 325 }
 326
 327 void DolphinDetailsView::dragMoveEvent(QDragMoveEvent* event)
 328 {
 329     QTreeView::dragMoveEvent(event);
 330
 331     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 332     setDirtyRegion(m_dropRect);
 333     const QModelIndex index = indexAt(event->pos());
 334     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 335         const KFileItem item = m_controller->itemForIndex(index);
 336         if (!item.isNull() && item.isDir()) {
 337             m_dropRect = visualRect(index);
 338         } else {
 339             m_dropRect.setSize(QSize()); // set as invalid
 340         }
 341         setDirtyRegion(m_dropRect);
 342     }
 343
 344     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 345         // accept url drops, independently from the destination item
 346         event->acceptProposedAction();
 347     }
 348 }
 349
 350 void DolphinDetailsView::dropEvent(QDropEvent* event)
 351 {
 352     const QModelIndex index = indexAt(event->pos());
 353     KFileItem item;
 354     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 355         item = m_controller->itemForIndex(index);
 356     }
 357     m_controller->indicateDroppedUrls(item, m_controller->url(), event);
 358     QTreeView::dropEvent(event);
 359 }
 360
 361 void DolphinDetailsView::paintEvent(QPaintEvent* event)
 362 {
 363     QTreeView::paintEvent(event);
 364     if (m_band.show) {
 365         // The following code has been taken from QListView
 366         // and adapted to DolphinDetailsView.
 367         // (C) 1992-2007 Trolltech ASA
 368         QStyleOptionRubberBand opt;
 369         opt.initFrom(this);
 370         opt.shape = QRubberBand::Rectangle;
 371         opt.opaque = false;
 372         opt.rect = elasticBandRect();
 373
 374         QPainter painter(viewport());
 375         painter.save();
 376         style()->drawControl(QStyle::CE_RubberBand, &opt, &painter);
 377         painter.restore();
 378     }
 379 }
 380
 381 void DolphinDetailsView::keyPressEvent(QKeyEvent* event)
 382 {
 383     // If the Control modifier is pressed, a multiple selection
 384     // is done and DolphinDetailsView::currentChanged() may not
 385     // not change the selection in a custom way.
 386     m_keyPressed = !(event->modifiers() & Qt::ControlModifier);
 387
 388     QTreeView::keyPressEvent(event);
 389     m_controller->handleKeyPressEvent(event);
 390 }
 391
 392 void DolphinDetailsView::keyReleaseEvent(QKeyEvent* event)
 393 {
 394     QTreeView::keyReleaseEvent(event);
 395     m_keyPressed = false;
 396 }
 397
 398 void DolphinDetailsView::resizeEvent(QResizeEvent* event)
 399 {
 400     QTreeView::resizeEvent(event);
 401     if (m_autoResize) {
 402         resizeColumns();
 403     }
 404 }
 405
 406 void DolphinDetailsView::wheelEvent(QWheelEvent* event)
 407 {
 408     if (m_selectionManager != 0) {
 409         m_selectionManager->reset();
 410     }
 411
 412     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 413     if (event->modifiers() & Qt::ControlModifier) {
 414         event->ignore();
 415         return;
 416     }
 417
 418     const int height = m_decorationSize.height();
 419     const int step = (height >= KIconLoader::SizeHuge) ? height / 10 : (KIconLoader::SizeHuge - height) / 2;
 420     verticalScrollBar()->setSingleStep(step);
 421     QTreeView::wheelEvent(event);
 422 }
 423
 424 void DolphinDetailsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 425 {
 426     QTreeView::currentChanged(current, previous);
 427     if (current.isValid() && !m_autoScroller->isActive()) {
 428         scrollTo(current);
 429     }
 430
 431     // Stay consistent with QListView: When changing the current index by key presses,
 432     // also change the selection.
 433     if (m_keyPressed) {
 434         selectionModel()->select(current, QItemSelectionModel::ClearAndSelect);
 435     }
 436 }
 437
 438 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 439 {
 440     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 441         // if the mouse is above an item and moved very fast outside the widget,
 442         // no viewportEntered() signal might be emitted although the mouse has been moved
 443         // above the viewport
 444         m_controller->emitViewportEntered();
 445     }
 446
 447     return QTreeView::eventFilter(watched, event);
 448 }
 449
 450 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 451 {
 452     // the blank portion of the name column counts as empty space
 453     const QModelIndex index = QTreeView::indexAt(point);
 454     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 455                                     (index.column() == KDirModel::Name) && !nameColumnRect(index).contains(point);
 456     return isAboveEmptySpace ? QModelIndex() : index;
 457 }
 458
 459 void DolphinDetailsView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
 460 {
 461     // We must override setSelection() as Qt calls it internally and when this happens
 462     // we must ensure that the default indexAt() is used.
 463     if (!m_band.show) {
 464         m_useDefaultIndexAt = true;
 465         QTreeView::setSelection(rect, command);
 466         m_useDefaultIndexAt = false;
 467     } else {
 468         // Use our own elastic band selection algorithm
 469         updateElasticBandSelection();
 470     }
 471 }
 472
 473 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 474 {
 475     if (!m_ignoreScrollTo) {
 476         QTreeView::scrollTo(index, hint);
 477     }
 478 }
 479
 480 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 481 {
 482     QHeaderView* headerView = header();
 483     headerView->setSortIndicator(sorting, headerView->sortIndicatorOrder());
 484 }
 485
 486 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 487 {
 488     QHeaderView* headerView = header();
 489     headerView->setSortIndicator(headerView->sortIndicatorSection(), sortOrder);
 490 }
 491
 492 void DolphinDetailsView::synchronizeSortingState(int column)
 493 {
 494     // The sorting has already been changed in QTreeView if this slot is
 495     // invoked, but Dolphin is not informed about this.
 496     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 497     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 498     m_controller->indicateSortingChange(sorting);
 499     m_controller->indicateSortOrderChange(sortOrder);
 500 }
 501
 502 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 503 {
 504     if (index.column() == DolphinModel::Name) {
 505         m_controller->emitItemEntered(index);
 506     } else {
 507         m_controller->emitViewportEntered();
 508     }
 509 }
 510
 511 void DolphinDetailsView::updateElasticBand()
 512 {
 513     if (m_band.show) {
 514         QRect dirtyRegion(elasticBandRect());
 515         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 516         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 517         // Going above the (logical) top-left of the view causes complications during selection;
 518         // we may as well prevent it.
 519         if (m_band.destination.y() < 0) {
 520             m_band.destination.setY(0);
 521         }
 522         if (m_band.destination.x() < 0) {
 523             m_band.destination.setX(0);
 524         }
 525
 526         dirtyRegion = dirtyRegion.united(elasticBandRect());
 527         setDirtyRegion(dirtyRegion);
 528     }
 529 }
 530
 531 QRect DolphinDetailsView::elasticBandRect() const
 532 {
 533     const QPoint pos(contentsPos());
 534     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 535
 536     const QPoint topLeft = m_band.origin - pos - scrollPos;
 537     const QPoint bottomRight = m_band.destination - pos - scrollPos;
 538     return QRect(topLeft, bottomRight).normalized();
 539 }
 540
 541 void DolphinDetailsView::setZoomLevel(int level)
 542 {
 543     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 544     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 545
 546     const bool showPreview = m_controller->dolphinView()->showPreview();
 547     if (showPreview) {
 548         settings->setPreviewSize(size);
 549     } else {
 550         settings->setIconSize(size);
 551     }
 552
 553     updateDecorationSize(showPreview);
 554 }
 555
 556
 557 void DolphinDetailsView::slotShowPreviewChanged()
 558 {
 559     const DolphinView* view = m_controller->dolphinView();
 560     updateDecorationSize(view->showPreview());
 561 }
 562
 563 void DolphinDetailsView::configureColumns(const QPoint& pos)
 564 {
 565     KMenu popup(this);
 566     popup.addTitle(i18nc("@title:menu", "Columns"));
 567
 568     QHeaderView* headerView = header();
 569     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 570         const int logicalIndex = headerView->logicalIndex(i);
 571         const QString text = model()->headerData(i, Qt::Horizontal).toString();
 572         QAction* action = popup.addAction(text);
 573         action->setCheckable(true);
 574         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 575         action->setData(i);
 576     }
 577
 578     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 579     if (activatedAction != 0) {
 580         const bool show = activatedAction->isChecked();
 581         const int columnIndex = activatedAction->data().toInt();
 582
 583         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 584         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 585         if (show) {
 586             Q_ASSERT(!list.contains(info));
 587             list.append(info);
 588         } else {
 589             Q_ASSERT(list.contains(info));
 590             const int index = list.indexOf(info);
 591             list.removeAt(index);
 592         }
 593
 594         m_controller->indicateAdditionalInfoChange(list);
 595         setColumnHidden(columnIndex, !show);
 596         resizeColumns();
 597     }
 598 }
 599
 600 void DolphinDetailsView::updateColumnVisibility()
 601 {
 602     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 603     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 604         const KFileItemDelegate::Information info = infoForColumn(i);
 605         const bool hide = !list.contains(info);
 606         if (isColumnHidden(i) != hide) {
 607             setColumnHidden(i, hide);
 608         }
 609     }
 610
 611     resizeColumns();
 612 }
 613
 614 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 615 {
 616     Q_UNUSED(logicalIndex);
 617     Q_UNUSED(oldSize);
 618     Q_UNUSED(newSize);
 619     // If the user changes the size of the headers, the autoresize feature should be
 620     // turned off. As there is no dedicated interface to find out whether the header
 621     // section has been resized by the user or by a resize event, the following approach is used:
 622     if ((QApplication::mouseButtons() & Qt::LeftButton) && isVisible()) {
 623         disableAutoResizing();
 624     }
 625 }
 626
 627 void DolphinDetailsView::slotActivationChanged(bool active)
 628 {
 629     setAlternatingRowColors(active);
 630 }
 631
 632 void DolphinDetailsView::disableAutoResizing()
 633 {
 634     m_autoResize = false;
 635 }
 636
 637 void DolphinDetailsView::requestActivation()
 638 {
 639     m_controller->requestActivation();
 640 }
 641
 642 void DolphinDetailsView::updateFont()
 643 {
 644     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 645     Q_ASSERT(settings != 0);
 646
 647     if (settings->useSystemFont()) {
 648         m_font = KGlobalSettings::generalFont();
 649     }
 650 }
 651
 652 void DolphinDetailsView::updateElasticBandSelection()
 653 {
 654     if (!m_band.show) {
 655         return;
 656     }
 657
 658     // Ensure the elastic band itself is up-to-date, in
 659     // case we are being called due to e.g. a drag event.
 660     updateElasticBand();
 661
 662     // Clip horizontally to the name column, as some filenames will be
 663     // longer than the column.  We don't clip vertically as origin
 664     // may be above or below the current viewport area.
 665     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 666     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 667     QRect selRect = elasticBandRect().normalized();
 668     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 669     selRect = nameColumnArea.intersect(selRect).normalized();
 670     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 671     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 672     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 673
 674     if (selRect.isNull()) {
 675         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 676         m_band.ignoreOldInfo = true;
 677         return;
 678     }
 679
 680     if (!m_band.ignoreOldInfo) {
 681         // Do some quick checks to see if we can rule out the need to
 682         // update the selection.
 683         Q_ASSERT(uniformRowHeights());
 684         QModelIndex dummyIndex = model()->index(0, 0);
 685         if (!dummyIndex.isValid()) {
 686             // No items in the model presumably.
 687             return;
 688         }
 689
 690         // If the elastic band does not cover the same rows as before, we'll
 691         // need to re-check, and also invalidate the old item distances.
 692         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 693         const bool coveringSameRows =
 694             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 695             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 696         if (coveringSameRows) {
 697             // Covering the same rows, but have we moved far enough horizontally
 698             // that we might have (de)selected some other items?
 699             const bool itemSelectionChanged =
 700                 ((selRect.left() > oldSelRect.left()) &&
 701                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 702                 ((selRect.left() < oldSelRect.left()) &&
 703                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 704                 ((selRect.right() < oldSelRect.right()) &&
 705                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 706                 ((selRect.right() > oldSelRect.right()) &&
 707                  (selRect.right() >= m_band.outsideNearestRightEdge));
 708
 709             if (!itemSelectionChanged) {
 710                 return;
 711             }
 712         }
 713     }
 714     else {
 715         // This is the only piece of optimization data that needs to be explicitly
 716         // discarded.
 717         m_band.lastSelectionOrigin = QPoint();
 718         m_band.lastSelectionDestination = QPoint();
 719         oldSelRect = selRect;
 720     }
 721
 722     // Do the selection from scratch. Force a update of the horizontal distances info.
 723     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 724     m_band.insideNearestRightEdge  = nameColumnX - 1;
 725     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 726     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 727
 728     // Include the old selection rect as well, so we can deselect
 729     // items that were inside it but not in the new selRect.
 730     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 731     if (boundingRect.isNull()) {
 732         return;
 733     }
 734
 735     // Get the index of the item in this row in the name column.
 736     // TODO - would this still work if the columns could be re-ordered?
 737     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 738     if (startIndex.parent().isValid()) {
 739         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 740     } else {
 741         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 742     }
 743     if (!startIndex.isValid()) {
 744         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 745         m_band.ignoreOldInfo = true;
 746         return;
 747     }
 748
 749    // Go through all indexes between the top and bottom of boundingRect, and
 750    // update the selection.
 751    const int verticalCutoff = boundingRect.bottom();
 752    QModelIndex currIndex = startIndex;
 753    QModelIndex lastIndex;
 754    bool allItemsInBoundDone = false;
 755
 756    // Calling selectionModel()->select(...) for each item that needs to be
 757    // toggled is slow as each call emits selectionChanged(...) so store them
 758    // and do the selection toggle in one batch.
 759    QItemSelection itemsToToggle;
 760    // QItemSelection's deal with continuous ranges of indexes better than
 761    // single indexes, so try to portion items that need to be toggled into ranges.
 762    bool formingToggleIndexRange = false;
 763    QModelIndex toggleIndexRangeBegin = QModelIndex();
 764
 765    do {
 766        QRect currIndexRect = nameColumnRect(currIndex);
 767
 768         // Update some optimization info as we go.
 769        const int cr = currIndexRect.right();
 770        const int cl = currIndexRect.left();
 771        const int sl = selRect.left();
 772        const int sr = selRect.right();
 773        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 774        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 775            m_band.outsideNearestLeftEdge = cr;
 776        }
 777        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 778            m_band.outsideNearestRightEdge = cl;
 779        }
 780        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 781            m_band.insideNearestRightEdge = cl;
 782        }
 783        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 784            m_band.insideNearestLeftEdge = cr;
 785        }
 786
 787        bool currentlySelected = selectionModel()->isSelected(currIndex);
 788        bool originallySelected = m_band.originalSelection.contains(currIndex);
 789        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 790        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 791        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 792        if (needToToggleItem && !formingToggleIndexRange) {
 793             toggleIndexRangeBegin = currIndex;
 794             formingToggleIndexRange = true;
 795        }
 796
 797        // NOTE: indexBelow actually walks up and down expanded trees for us.
 798        QModelIndex nextIndex = indexBelow(currIndex);
 799        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 800
 801        const bool commitToggleIndexRange = formingToggleIndexRange &&
 802                                            (!needToToggleItem ||
 803                                             allItemsInBoundDone ||
 804                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 805        if (commitToggleIndexRange) {
 806            formingToggleIndexRange = false;
 807             // If this is the last item in the bounds and it is also the beginning of a range,
 808             // don't toggle lastIndex - it will already have been dealt with.
 809            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 810                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 811            }
 812             // Need to start a new range immediately with currIndex?
 813            if (needToToggleItem) {
 814                toggleIndexRangeBegin = currIndex;
 815                formingToggleIndexRange = true;
 816            }
 817            if (allItemsInBoundDone && needToToggleItem) {
 818                 // Toggle the very last item in the bounds.
 819                itemsToToggle.select(currIndex, currIndex);
 820            }
 821        }
 822
 823        // next item
 824        lastIndex = currIndex;
 825        currIndex = nextIndex;
 826     } while (!allItemsInBoundDone);
 827
 828     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 829
 830     m_band.lastSelectionOrigin = m_band.origin;
 831     m_band.lastSelectionDestination = m_band.destination;
 832     m_band.ignoreOldInfo = false;
 833 }
 834
 835 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 836 {
 837     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 838     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 839     setIconSize(QSize(iconSize, iconSize));
 840     m_decorationSize = QSize(iconSize, iconSize);
 841
 842     if (m_selectionManager != 0) {
 843         m_selectionManager->reset();
 844     }
 845
 846     doItemsLayout();
 847 }
 848
 849 QPoint DolphinDetailsView::contentsPos() const
 850 {
 851     // implementation note: the horizonal position is ignored currently, as no
 852     // horizontal scrolling is done anyway during a selection
 853     const QScrollBar* scrollbar = verticalScrollBar();
 854     Q_ASSERT(scrollbar != 0);
 855
 856     const int maxHeight = maximumViewportSize().height();
 857     const int height = scrollbar->maximum() - scrollbar->minimum() + 1;
 858     const int visibleHeight = model()->rowCount() + 1 - height;
 859     if (visibleHeight <= 0) {
 860         return QPoint(0, 0);
 861     }
 862
 863     const int y = scrollbar->sliderPosition() * maxHeight / visibleHeight;
 864     return QPoint(0, y);
 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 < 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"