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_font(),
  59     m_decorationSize(),
  60     m_band()
  61 {
  62     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
  63     Q_ASSERT(settings != 0);
  64     Q_ASSERT(controller != 0);
  65
  66     setLayoutDirection(Qt::LeftToRight);
  67     setAcceptDrops(true);
  68     setSortingEnabled(true);
  69     setUniformRowHeights(true);
  70     setSelectionBehavior(SelectItems);
  71     setDragDropMode(QAbstractItemView::DragDrop);
  72     setDropIndicatorShown(false);
  73     setAlternatingRowColors(true);
  74     setRootIsDecorated(settings->expandableFolders());
  75     setItemsExpandable(settings->expandableFolders());
  76     setEditTriggers(QAbstractItemView::NoEditTriggers);
  77
  78     setMouseTracking(true);
  79     new DolphinViewAutoScroller(this);
  80
  81     const ViewProperties props(controller->url());
  82     setSortIndicatorSection(props.sorting());
  83     setSortIndicatorOrder(props.sortOrder());
  84
  85     QHeaderView* headerView = header();
  86     connect(headerView, SIGNAL(sectionClicked(int)),
  87             this, SLOT(synchronizeSortingState(int)));
  88     headerView->setContextMenuPolicy(Qt::CustomContextMenu);
  89     connect(headerView, SIGNAL(customContextMenuRequested(const QPoint&)),
  90             this, SLOT(configureColumns(const QPoint&)));
  91     connect(headerView, SIGNAL(sectionResized(int, int, int)),
  92             this, SLOT(slotHeaderSectionResized(int, int, int)));
  93     connect(headerView, SIGNAL(sectionHandleDoubleClicked(int)),
  94             this, SLOT(disableAutoResizing()));
  95
  96     connect(parent, SIGNAL(sortingChanged(DolphinView::Sorting)),
  97             this, SLOT(setSortIndicatorSection(DolphinView::Sorting)));
  98     connect(parent, SIGNAL(sortOrderChanged(Qt::SortOrder)),
  99             this, SLOT(setSortIndicatorOrder(Qt::SortOrder)));
 100
 101     connect(this, SIGNAL(clicked(const QModelIndex&)),
 102             controller, SLOT(requestTab(const QModelIndex&)));
 103     if (KGlobalSettings::singleClick()) {
 104         connect(this, SIGNAL(clicked(const QModelIndex&)),
 105                 controller, SLOT(triggerItem(const QModelIndex&)));
 106     } else {
 107         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 108                 controller, SLOT(triggerItem(const QModelIndex&)));
 109     }
 110
 111     if (DolphinSettings::instance().generalSettings()->showSelectionToggle()) {
 112         m_selectionManager = new SelectionManager(this);
 113         connect(m_selectionManager, SIGNAL(selectionChanged()),
 114                 this, SLOT(requestActivation()));
 115         connect(m_controller, SIGNAL(urlChanged(const KUrl&)),
 116                 m_selectionManager, SLOT(reset()));
 117     }
 118
 119     connect(this, SIGNAL(entered(const QModelIndex&)),
 120             this, SLOT(slotEntered(const QModelIndex&)));
 121     connect(this, SIGNAL(viewportEntered()),
 122             controller, SLOT(emitViewportEntered()));
 123     connect(controller, SIGNAL(zoomLevelChanged(int)),
 124             this, SLOT(setZoomLevel(int)));
 125     connect(controller->dolphinView(), SIGNAL(additionalInfoChanged()),
 126             this, SLOT(updateColumnVisibility()));
 127     connect(controller, SIGNAL(activationChanged(bool)),
 128             this, SLOT(slotActivationChanged(bool)));
 129
 130     if (settings->useSystemFont()) {
 131         m_font = KGlobalSettings::generalFont();
 132     } else {
 133         m_font = QFont(settings->fontFamily(),
 134                        settings->fontSize(),
 135                        settings->fontWeight(),
 136                        settings->italicFont());
 137     }
 138
 139     setVerticalScrollMode(QTreeView::ScrollPerPixel);
 140     setHorizontalScrollMode(QTreeView::ScrollPerPixel);
 141
 142     const DolphinView* view = controller->dolphinView();
 143     connect(view, SIGNAL(showPreviewChanged()),
 144             this, SLOT(slotShowPreviewChanged()));
 145
 146     updateDecorationSize(view->showPreview());
 147
 148     setFocus();
 149     viewport()->installEventFilter(this);
 150
 151     connect(KGlobalSettings::self(), SIGNAL(kdisplayFontChanged()),
 152             this, SLOT(updateFont()));
 153
 154     m_useDefaultIndexAt = false;
 155 }
 156
 157 DolphinDetailsView::~DolphinDetailsView()
 158 {
 159 }
 160
 161 bool DolphinDetailsView::event(QEvent* event)
 162 {
 163     if (event->type() == QEvent::Polish) {
 164         QHeaderView* headerView = header();
 165         headerView->setResizeMode(QHeaderView::Interactive);
 166         headerView->setMovable(false);
 167
 168         updateColumnVisibility();
 169
 170         hideColumn(DolphinModel::Rating);
 171         hideColumn(DolphinModel::Tags);
 172     }
 173
 174     return QTreeView::event(event);
 175 }
 176
 177 QStyleOptionViewItem DolphinDetailsView::viewOptions() const
 178 {
 179     QStyleOptionViewItem viewOptions = QTreeView::viewOptions();
 180     viewOptions.font = m_font;
 181     viewOptions.showDecorationSelected = true;
 182     viewOptions.decorationSize = m_decorationSize;
 183     return viewOptions;
 184 }
 185
 186 void DolphinDetailsView::contextMenuEvent(QContextMenuEvent* event)
 187 {
 188     QTreeView::contextMenuEvent(event);
 189     m_controller->triggerContextMenuRequest(event->pos());
 190 }
 191
 192 void DolphinDetailsView::mousePressEvent(QMouseEvent* event)
 193 {
 194     m_controller->requestActivation();
 195
 196     const QModelIndex current = currentIndex();
 197     QTreeView::mousePressEvent(event);
 198
 199     m_expandingTogglePressed = false;
 200     const QModelIndex index = indexAt(event->pos());
 201     const bool updateState = index.isValid() &&
 202                              (index.column() == DolphinModel::Name) &&
 203                              (event->button() == Qt::LeftButton);
 204     if (updateState) {
 205         // TODO: See comment in DolphinIconsView::mousePressEvent(). Only update
 206         // the state if no expanding/collapsing area has been hit:
 207         const QRect rect = visualRect(index);
 208         if (event->pos().x() >= rect.x() + indentation()) {
 209             setState(QAbstractItemView::DraggingState);
 210         } else {
 211             m_expandingTogglePressed = true;
 212             kDebug() << "m_expandingTogglePressed " << m_expandingTogglePressed;
 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()) {
 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
 469         // Use our own elastic band selection algorithm
 470         updateElasticBandSelection();
 471     }
 472 }
 473
 474 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 475 {
 476     if (m_ignoreScrollTo)
 477         return;
 478     QTreeView::scrollTo(index, hint);
 479 }
 480
 481 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 482 {
 483     QHeaderView* headerView = header();
 484     headerView->setSortIndicator(sorting, headerView->sortIndicatorOrder());
 485 }
 486
 487 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 488 {
 489     QHeaderView* headerView = header();
 490     headerView->setSortIndicator(headerView->sortIndicatorSection(), sortOrder);
 491 }
 492
 493 void DolphinDetailsView::synchronizeSortingState(int column)
 494 {
 495     // The sorting has already been changed in QTreeView if this slot is
 496     // invoked, but Dolphin is not informed about this.
 497     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 498     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 499     m_controller->indicateSortingChange(sorting);
 500     m_controller->indicateSortOrderChange(sortOrder);
 501 }
 502
 503 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 504 {
 505     if (index.column() == DolphinModel::Name) {
 506         m_controller->emitItemEntered(index);
 507     } else {
 508         m_controller->emitViewportEntered();
 509     }
 510 }
 511
 512 void DolphinDetailsView::updateElasticBand()
 513 {
 514     if (m_band.show) {
 515         QRect dirtyRegion(elasticBandRect());
 516         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 517         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 518         // Going above the (logical) top-left of the view causes complications during selection;
 519         // we may as well prevent it.
 520         if (m_band.destination.y() < 0)
 521             m_band.destination.setY(0);
 522         if (m_band.destination.x() < 0)
 523             m_band.destination.setX(0);
 524
 525         dirtyRegion = dirtyRegion.united(elasticBandRect());
 526         setDirtyRegion(dirtyRegion);
 527     }
 528 }
 529
 530 QRect DolphinDetailsView::elasticBandRect() const
 531 {
 532     const QPoint pos(contentsPos());
 533     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 534
 535     const QPoint topLeft = m_band.origin - pos - scrollPos;
 536     const QPoint bottomRight = m_band.destination - pos - scrollPos;
 537     return QRect(topLeft, bottomRight).normalized();
 538 }
 539
 540 void DolphinDetailsView::setZoomLevel(int level)
 541 {
 542     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 543     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 544
 545     const bool showPreview = m_controller->dolphinView()->showPreview();
 546     if (showPreview) {
 547         settings->setPreviewSize(size);
 548     } else {
 549         settings->setIconSize(size);
 550     }
 551
 552     updateDecorationSize(showPreview);
 553 }
 554
 555
 556 void DolphinDetailsView::slotShowPreviewChanged()
 557 {
 558     const DolphinView* view = m_controller->dolphinView();
 559     updateDecorationSize(view->showPreview());
 560 }
 561
 562 void DolphinDetailsView::configureColumns(const QPoint& pos)
 563 {
 564     KMenu popup(this);
 565     popup.addTitle(i18nc("@title:menu", "Columns"));
 566
 567     QHeaderView* headerView = header();
 568     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 569         const int logicalIndex = headerView->logicalIndex(i);
 570         const QString text = model()->headerData(i, Qt::Horizontal).toString();
 571         QAction* action = popup.addAction(text);
 572         action->setCheckable(true);
 573         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 574         action->setData(i);
 575     }
 576
 577     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 578     if (activatedAction != 0) {
 579         const bool show = activatedAction->isChecked();
 580         const int columnIndex = activatedAction->data().toInt();
 581
 582         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 583         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 584         if (show) {
 585             Q_ASSERT(!list.contains(info));
 586             list.append(info);
 587         } else {
 588             Q_ASSERT(list.contains(info));
 589             const int index = list.indexOf(info);
 590             list.removeAt(index);
 591         }
 592
 593         m_controller->indicateAdditionalInfoChange(list);
 594         setColumnHidden(columnIndex, !show);
 595         resizeColumns();
 596     }
 597 }
 598
 599 void DolphinDetailsView::updateColumnVisibility()
 600 {
 601     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 602     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 603         const KFileItemDelegate::Information info = infoForColumn(i);
 604         const bool hide = !list.contains(info);
 605         if (isColumnHidden(i) != hide) {
 606             setColumnHidden(i, hide);
 607         }
 608     }
 609
 610     resizeColumns();
 611 }
 612
 613 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 614 {
 615     Q_UNUSED(logicalIndex);
 616     Q_UNUSED(oldSize);
 617     Q_UNUSED(newSize);
 618     // If the user changes the size of the headers, the autoresize feature should be
 619     // turned off. As there is no dedicated interface to find out whether the header
 620     // section has been resized by the user or by a resize event, the following approach is used:
 621     if ((QApplication::mouseButtons() & Qt::LeftButton) && isVisible()) {
 622         disableAutoResizing();
 623     }
 624 }
 625
 626 void DolphinDetailsView::slotActivationChanged(bool active)
 627 {
 628     setAlternatingRowColors(active);
 629 }
 630
 631 void DolphinDetailsView::disableAutoResizing()
 632 {
 633     m_autoResize = false;
 634 }
 635
 636 void DolphinDetailsView::requestActivation()
 637 {
 638     m_controller->requestActivation();
 639 }
 640
 641 void DolphinDetailsView::updateFont()
 642 {
 643     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 644     Q_ASSERT(settings != 0);
 645
 646     if (settings->useSystemFont()) {
 647         m_font = KGlobalSettings::generalFont();
 648     }
 649 }
 650
 651 void DolphinDetailsView::updateElasticBandSelection()
 652 {
 653     if (!m_band.show) {
 654         return;
 655     }
 656
 657     // Ensure the elastic band itself is up-to-date, in
 658     // case we are being called due to e.g. a drag event.
 659     updateElasticBand();
 660
 661     // Clip horizontally to the name column, as some filenames will be
 662     // longer than the column.  We don't clip vertically as origin
 663     // may be above or below the current viewport area.
 664     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 665     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 666     QRect selRect = elasticBandRect().normalized();
 667     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 668     selRect = nameColumnArea.intersect(selRect).normalized();
 669     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 670     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 671     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 672
 673     if (selRect.isNull()) {
 674         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 675         m_band.ignoreOldInfo = true;
 676         return;
 677     }
 678
 679     if (!m_band.ignoreOldInfo) {
 680         // Do some quick checks to see if we can rule out the need to
 681         // update the selection.
 682         Q_ASSERT(uniformRowHeights());
 683         QModelIndex dummyIndex = model()->index(0, 0);
 684         if (!dummyIndex.isValid()) {
 685             // No items in the model presumably.
 686             return;
 687         }
 688
 689         // If the elastic band does not cover the same rows as before, we'll
 690         // need to re-check, and also invalidate the old item distances.
 691         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 692         const bool coveringSameRows =
 693             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 694             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 695         if (coveringSameRows) {
 696             // Covering the same rows, but have we moved far enough horizontally
 697             // that we might have (de)selected some other items?
 698             const bool itemSelectionChanged =
 699                 ((selRect.left() > oldSelRect.left()) &&
 700                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 701                 ((selRect.left() < oldSelRect.left()) &&
 702                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 703                 ((selRect.right() < oldSelRect.right()) &&
 704                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 705                 ((selRect.right() > oldSelRect.right()) &&
 706                  (selRect.right() >= m_band.outsideNearestRightEdge));
 707
 708             if (!itemSelectionChanged) {
 709                 return;
 710             }
 711         }
 712     }
 713     else {
 714         // This is the only piece of optimization data that needs to be explicitly
 715         // discarded.
 716         m_band.lastSelectionOrigin = QPoint();
 717         m_band.lastSelectionDestination = QPoint();
 718         oldSelRect = selRect;
 719     }
 720
 721     // Do the selection from scratch. Force a update of the horizontal distances info.
 722     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 723     m_band.insideNearestRightEdge  = nameColumnX - 1;
 724     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 725     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 726
 727     // Include the old selection rect as well, so we can deselect
 728     // items that were inside it but not in the new selRect.
 729     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 730     if (boundingRect.isNull()) {
 731         return;
 732     }
 733
 734     // Get the index of the item in this row in the name column.
 735     // TODO - would this still work if the columns could be re-ordered?
 736     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 737     if (startIndex.parent().isValid()) {
 738         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 739     } else {
 740         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 741     }
 742     if (!startIndex.isValid()) {
 743         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 744         m_band.ignoreOldInfo = true;
 745         return;
 746     }
 747
 748    // Go through all indexes between the top and bottom of boundingRect, and
 749    // update the selection.
 750    const int verticalCutoff = boundingRect.bottom();
 751    QModelIndex currIndex = startIndex;
 752    QModelIndex lastIndex;
 753    bool allItemsInBoundDone = false;
 754
 755    // Calling selectionModel()->select(...) for each item that needs to be
 756    // toggled is slow as each call emits selectionChanged(...) so store them
 757    // and do the selection toggle in one batch.
 758    QItemSelection itemsToToggle;
 759    // QItemSelection's deal with continuous ranges of indexes better than
 760    // single indexes, so try to portion items that need to be toggled into ranges.
 761    bool formingToggleIndexRange = false;
 762    QModelIndex toggleIndexRangeBegin = QModelIndex();
 763
 764    do {
 765        QRect currIndexRect = nameColumnRect(currIndex);
 766
 767         // Update some optimization info as we go.
 768        const int cr = currIndexRect.right();
 769        const int cl = currIndexRect.left();
 770        const int sl = selRect.left();
 771        const int sr = selRect.right();
 772        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 773        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 774            m_band.outsideNearestLeftEdge = cr;
 775        }
 776        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 777            m_band.outsideNearestRightEdge = cl;
 778        }
 779        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 780            m_band.insideNearestRightEdge = cl;
 781        }
 782        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 783            m_band.insideNearestLeftEdge = cr;
 784        }
 785
 786        bool currentlySelected = selectionModel()->isSelected(currIndex);
 787        bool originallySelected = m_band.originalSelection.contains(currIndex);
 788        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 789        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 790        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 791        if (needToToggleItem && !formingToggleIndexRange) {
 792             toggleIndexRangeBegin = currIndex;
 793             formingToggleIndexRange = true;
 794        }
 795
 796        // NOTE: indexBelow actually walks up and down expanded trees for us.
 797        QModelIndex nextIndex = indexBelow(currIndex);
 798        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 799
 800        const bool commitToggleIndexRange = formingToggleIndexRange &&
 801                                            (!needToToggleItem ||
 802                                             allItemsInBoundDone ||
 803                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 804        if (commitToggleIndexRange) {
 805            formingToggleIndexRange = false;
 806             // If this is the last item in the bounds and it is also the beginning of a range,
 807             // don't toggle lastIndex - it will already have been dealt with.
 808            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 809                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 810            }
 811             // Need to start a new range immediately with currIndex?
 812            if (needToToggleItem) {
 813                toggleIndexRangeBegin = currIndex;
 814                formingToggleIndexRange = true;
 815            }
 816            if (allItemsInBoundDone && needToToggleItem) {
 817                 // Toggle the very last item in the bounds.
 818                itemsToToggle.select(currIndex, currIndex);
 819            }
 820        }
 821
 822        // next item
 823        lastIndex = currIndex;
 824        currIndex = nextIndex;
 825     } while (!allItemsInBoundDone);
 826
 827     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 828
 829     m_band.lastSelectionOrigin = m_band.origin;
 830     m_band.lastSelectionDestination = m_band.destination;
 831     m_band.ignoreOldInfo = false;
 832 }
 833
 834 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 835 {
 836     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 837     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 838     setIconSize(QSize(iconSize, iconSize));
 839     m_decorationSize = QSize(iconSize, iconSize);
 840
 841     if (m_selectionManager != 0) {
 842         m_selectionManager->reset();
 843     }
 844
 845     doItemsLayout();
 846 }
 847
 848 QPoint DolphinDetailsView::contentsPos() const
 849 {
 850     // implementation note: the horizonal position is ignored currently, as no
 851     // horizontal scrolling is done anyway during a selection
 852     const QScrollBar* scrollbar = verticalScrollBar();
 853     Q_ASSERT(scrollbar != 0);
 854
 855     const int maxHeight = maximumViewportSize().height();
 856     const int height = scrollbar->maximum() - scrollbar->minimum() + 1;
 857     const int visibleHeight = model()->rowCount() + 1 - height;
 858     if (visibleHeight <= 0) {
 859         return QPoint(0, 0);
 860     }
 861
 862     const int y = scrollbar->sliderPosition() * maxHeight / visibleHeight;
 863     return QPoint(0, y);
 864 }
 865
 866 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 867 {
 868     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 869
 870     switch (columnIndex) {
 871     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 872     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 873     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 874     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 875     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 876     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 877     default: break;
 878     }
 879
 880     return info;
 881 }
 882
 883 void DolphinDetailsView::resizeColumns()
 884 {
 885     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 886     // around 3 seconds for each (!) resize operation when having > 10000 items).
 887     // This gets a problem especially when opening large directories, where several
 888     // resize operations are received for showing the currently available items during
 889     // loading (the application hangs around 20 seconds when loading > 10000 items).
 890
 891     QHeaderView* headerView = header();
 892     QFontMetrics fontMetrics(viewport()->font());
 893
 894     int columnWidth[KDirModel::ColumnCount];
 895     columnWidth[KDirModel::Size] = fontMetrics.width("00000 Items");
 896     columnWidth[KDirModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 897     columnWidth[KDirModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 898     columnWidth[KDirModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 899     columnWidth[KDirModel::Group] = fontMetrics.width("xxxxxxxxxx");
 900     columnWidth[KDirModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
 901
 902     int requiredWidth = 0;
 903     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
 904         if (!isColumnHidden(i)) {
 905             columnWidth[i] += 20; // provide a default gap
 906             requiredWidth += columnWidth[i];
 907             headerView->resizeSection(i, columnWidth[i]);
 908         }
 909     }
 910
 911     // resize the name column in a way that the whole available width is used
 912     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 913
 914     const int minNameWidth = 300;
 915     if (columnWidth[KDirModel::Name] < minNameWidth) {
 916         columnWidth[KDirModel::Name] = minNameWidth;
 917
 918         // It might be possible that the name column width can be
 919         // decreased without clipping any text. For performance
 920         // reasons the exact necessary width for full visible names is
 921         // only checked for up to 200 items:
 922         const int rowCount = model()->rowCount();
 923         if (rowCount < 200) {
 924             const int nameWidth = sizeHintForColumn(DolphinModel::Name);
 925             if (nameWidth + requiredWidth <= viewport()->width()) {
 926                 columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 927             } else if (nameWidth < minNameWidth) {
 928                 columnWidth[KDirModel::Name] = nameWidth;
 929             }
 930         }
 931     }
 932
 933     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
 934 }
 935
 936 QRect DolphinDetailsView::nameColumnRect(const QModelIndex& index) const
 937 {
 938     QRect rect = visualRect(index);
 939     const KFileItem item = m_controller->itemForIndex(index);
 940     if (!item.isNull()) {
 941         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 942         rect.setWidth(width);
 943     }
 944
 945     return rect;
 946 }
 947
 948 DolphinDetailsView::ElasticBand::ElasticBand() :
 949     show(false),
 950     origin(),
 951     destination(),
 952     lastSelectionOrigin(),
 953     lastSelectionDestination(),
 954     ignoreOldInfo(true),
 955     outsideNearestLeftEdge(0),
 956     outsideNearestRightEdge(0),
 957     insideNearestLeftEdge(0),
 958     insideNearestRightEdge(0)
 959 {
 960 }
 961
 962 #include "dolphindetailsview.moc"