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
 428     // Stay consistent with QListView: When changing the current index by key presses,
 429     // also change the selection.
 430     if (m_keyPressed) {
 431         selectionModel()->select(current, QItemSelectionModel::ClearAndSelect);
 432     }
 433 }
 434
 435 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 436 {
 437     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 438         // if the mouse is above an item and moved very fast outside the widget,
 439         // no viewportEntered() signal might be emitted although the mouse has been moved
 440         // above the viewport
 441         m_controller->emitViewportEntered();
 442     }
 443
 444     return QTreeView::eventFilter(watched, event);
 445 }
 446
 447 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 448 {
 449     // the blank portion of the name column counts as empty space
 450     const QModelIndex index = QTreeView::indexAt(point);
 451     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 452                                     (index.column() == KDirModel::Name) && !nameColumnRect(index).contains(point);
 453     return isAboveEmptySpace ? QModelIndex() : index;
 454 }
 455
 456 void DolphinDetailsView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
 457 {
 458     // We must override setSelection() as Qt calls it internally and when this happens
 459     // we must ensure that the default indexAt() is used.
 460     if (!m_band.show) {
 461         m_useDefaultIndexAt = true;
 462         QTreeView::setSelection(rect, command);
 463         m_useDefaultIndexAt = false;
 464     } else {
 465
 466         // Use our own elastic band selection algorithm
 467         updateElasticBandSelection();
 468     }
 469 }
 470
 471 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 472 {
 473     if (m_ignoreScrollTo)
 474         return;
 475     QTreeView::scrollTo(index, hint);
 476 }
 477
 478 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 479 {
 480     QHeaderView* headerView = header();
 481     headerView->setSortIndicator(sorting, headerView->sortIndicatorOrder());
 482 }
 483
 484 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 485 {
 486     QHeaderView* headerView = header();
 487     headerView->setSortIndicator(headerView->sortIndicatorSection(), sortOrder);
 488 }
 489
 490 void DolphinDetailsView::synchronizeSortingState(int column)
 491 {
 492     // The sorting has already been changed in QTreeView if this slot is
 493     // invoked, but Dolphin is not informed about this.
 494     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 495     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 496     m_controller->indicateSortingChange(sorting);
 497     m_controller->indicateSortOrderChange(sortOrder);
 498 }
 499
 500 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 501 {
 502     if (index.column() == DolphinModel::Name) {
 503         m_controller->emitItemEntered(index);
 504     } else {
 505         m_controller->emitViewportEntered();
 506     }
 507 }
 508
 509 void DolphinDetailsView::updateElasticBand()
 510 {
 511     if (m_band.show) {
 512         QRect dirtyRegion(elasticBandRect());
 513         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 514         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 515         // Going above the (logical) top-left of the view causes complications during selection;
 516         // we may as well prevent it.
 517         if (m_band.destination.y() < 0)
 518             m_band.destination.setY(0);
 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 pos(contentsPos());
 530     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 531
 532     const QPoint topLeft = m_band.origin - pos - scrollPos;
 533     const QPoint bottomRight = m_band.destination - pos - scrollPos;
 534     return QRect(topLeft, bottomRight).normalized();
 535 }
 536
 537 void DolphinDetailsView::setZoomLevel(int level)
 538 {
 539     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 540     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 541
 542     const bool showPreview = m_controller->dolphinView()->showPreview();
 543     if (showPreview) {
 544         settings->setPreviewSize(size);
 545     } else {
 546         settings->setIconSize(size);
 547     }
 548
 549     updateDecorationSize(showPreview);
 550 }
 551
 552
 553 void DolphinDetailsView::slotShowPreviewChanged()
 554 {
 555     const DolphinView* view = m_controller->dolphinView();
 556     updateDecorationSize(view->showPreview());
 557 }
 558
 559 void DolphinDetailsView::configureColumns(const QPoint& pos)
 560 {
 561     KMenu popup(this);
 562     popup.addTitle(i18nc("@title:menu", "Columns"));
 563
 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
 574     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 575     if (activatedAction != 0) {
 576         const bool show = activatedAction->isChecked();
 577         const int columnIndex = activatedAction->data().toInt();
 578
 579         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 580         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 581         if (show) {
 582             Q_ASSERT(!list.contains(info));
 583             list.append(info);
 584         } else {
 585             Q_ASSERT(list.contains(info));
 586             const int index = list.indexOf(info);
 587             list.removeAt(index);
 588         }
 589
 590         m_controller->indicateAdditionalInfoChange(list);
 591         setColumnHidden(columnIndex, !show);
 592         resizeColumns();
 593     }
 594 }
 595
 596 void DolphinDetailsView::updateColumnVisibility()
 597 {
 598     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 599     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 600         const KFileItemDelegate::Information info = infoForColumn(i);
 601         const bool hide = !list.contains(info);
 602         if (isColumnHidden(i) != hide) {
 603             setColumnHidden(i, hide);
 604         }
 605     }
 606
 607     resizeColumns();
 608 }
 609
 610 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 611 {
 612     Q_UNUSED(logicalIndex);
 613     Q_UNUSED(oldSize);
 614     Q_UNUSED(newSize);
 615     // If the user changes the size of the headers, the autoresize feature should be
 616     // turned off. As there is no dedicated interface to find out whether the header
 617     // section has been resized by the user or by a resize event, the following approach is used:
 618     if ((QApplication::mouseButtons() & Qt::LeftButton) && isVisible()) {
 619         disableAutoResizing();
 620     }
 621 }
 622
 623 void DolphinDetailsView::slotActivationChanged(bool active)
 624 {
 625     setAlternatingRowColors(active);
 626 }
 627
 628 void DolphinDetailsView::disableAutoResizing()
 629 {
 630     m_autoResize = false;
 631 }
 632
 633 void DolphinDetailsView::requestActivation()
 634 {
 635     m_controller->requestActivation();
 636 }
 637
 638 void DolphinDetailsView::updateFont()
 639 {
 640     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 641     Q_ASSERT(settings != 0);
 642
 643     if (settings->useSystemFont()) {
 644         m_font = KGlobalSettings::generalFont();
 645     }
 646 }
 647
 648 void DolphinDetailsView::updateElasticBandSelection()
 649 {
 650     if (!m_band.show) {
 651         return;
 652     }
 653
 654     // Ensure the elastic band itself is up-to-date, in
 655     // case we are being called due to e.g. a drag event.
 656     updateElasticBand();
 657
 658     // Clip horizontally to the name column, as some filenames will be
 659     // longer than the column.  We don't clip vertically as origin
 660     // may be above or below the current viewport area.
 661     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 662     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 663     QRect selRect = elasticBandRect().normalized();
 664     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 665     selRect = nameColumnArea.intersect(selRect).normalized();
 666     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 667     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 668     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 669
 670     if (selRect.isNull()) {
 671         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 672         m_band.ignoreOldInfo = true;
 673         return;
 674     }
 675
 676     if (!m_band.ignoreOldInfo) {
 677         // Do some quick checks to see if we can rule out the need to
 678         // update the selection.
 679         Q_ASSERT(uniformRowHeights());
 680         QModelIndex dummyIndex = model()->index(0, 0);
 681         if (!dummyIndex.isValid()) {
 682             // No items in the model presumably.
 683             return;
 684         }
 685
 686         // If the elastic band does not cover the same rows as before, we'll
 687         // need to re-check, and also invalidate the old item distances.
 688         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 689         const bool coveringSameRows =
 690             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 691             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 692         if (coveringSameRows) {
 693             // Covering the same rows, but have we moved far enough horizontally
 694             // that we might have (de)selected some other items?
 695             const bool itemSelectionChanged =
 696                 ((selRect.left() > oldSelRect.left()) &&
 697                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 698                 ((selRect.left() < oldSelRect.left()) &&
 699                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 700                 ((selRect.right() < oldSelRect.right()) &&
 701                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 702                 ((selRect.right() > oldSelRect.right()) &&
 703                  (selRect.right() >= m_band.outsideNearestRightEdge));
 704
 705             if (!itemSelectionChanged) {
 706                 return;
 707             }
 708         }
 709     }
 710     else {
 711         // This is the only piece of optimization data that needs to be explicitly
 712         // discarded.
 713         m_band.lastSelectionOrigin = QPoint();
 714         m_band.lastSelectionDestination = QPoint();
 715         oldSelRect = selRect;
 716     }
 717
 718     // Do the selection from scratch. Force a update of the horizontal distances info.
 719     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 720     m_band.insideNearestRightEdge  = nameColumnX - 1;
 721     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 722     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 723
 724     // Include the old selection rect as well, so we can deselect
 725     // items that were inside it but not in the new selRect.
 726     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 727     if (boundingRect.isNull()) {
 728         return;
 729     }
 730
 731     // Get the index of the item in this row in the name column.
 732     // TODO - would this still work if the columns could be re-ordered?
 733     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 734     if (startIndex.parent().isValid()) {
 735         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 736     } else {
 737         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 738     }
 739     if (!startIndex.isValid()) {
 740         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 741         m_band.ignoreOldInfo = true;
 742         return;
 743     }
 744
 745    // Go through all indexes between the top and bottom of boundingRect, and
 746    // update the selection.
 747    const int verticalCutoff = boundingRect.bottom();
 748    QModelIndex currIndex = startIndex;
 749    QModelIndex lastIndex;
 750    bool allItemsInBoundDone = false;
 751
 752    // Calling selectionModel()->select(...) for each item that needs to be
 753    // toggled is slow as each call emits selectionChanged(...) so store them
 754    // and do the selection toggle in one batch.
 755    QItemSelection itemsToToggle;
 756    // QItemSelection's deal with continuous ranges of indexes better than
 757    // single indexes, so try to portion items that need to be toggled into ranges.
 758    bool formingToggleIndexRange = false;
 759    QModelIndex toggleIndexRangeBegin = QModelIndex();
 760
 761    do {
 762        QRect currIndexRect = nameColumnRect(currIndex);
 763
 764         // Update some optimization info as we go.
 765        const int cr = currIndexRect.right();
 766        const int cl = currIndexRect.left();
 767        const int sl = selRect.left();
 768        const int sr = selRect.right();
 769        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 770        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 771            m_band.outsideNearestLeftEdge = cr;
 772        }
 773        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 774            m_band.outsideNearestRightEdge = cl;
 775        }
 776        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 777            m_band.insideNearestRightEdge = cl;
 778        }
 779        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 780            m_band.insideNearestLeftEdge = cr;
 781        }
 782
 783        bool currentlySelected = selectionModel()->isSelected(currIndex);
 784        bool originallySelected = m_band.originalSelection.contains(currIndex);
 785        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 786        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 787        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 788        if (needToToggleItem && !formingToggleIndexRange) {
 789             toggleIndexRangeBegin = currIndex;
 790             formingToggleIndexRange = true;
 791        }
 792
 793        // NOTE: indexBelow actually walks up and down expanded trees for us.
 794        QModelIndex nextIndex = indexBelow(currIndex);
 795        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 796
 797        const bool commitToggleIndexRange = formingToggleIndexRange &&
 798                                            (!needToToggleItem ||
 799                                             allItemsInBoundDone ||
 800                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 801        if (commitToggleIndexRange) {
 802            formingToggleIndexRange = false;
 803             // If this is the last item in the bounds and it is also the beginning of a range,
 804             // don't toggle lastIndex - it will already have been dealt with.
 805            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 806                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 807            }
 808             // Need to start a new range immediately with currIndex?
 809            if (needToToggleItem) {
 810                toggleIndexRangeBegin = currIndex;
 811                formingToggleIndexRange = true;
 812            }
 813            if (allItemsInBoundDone && needToToggleItem) {
 814                 // Toggle the very last item in the bounds.
 815                itemsToToggle.select(currIndex, currIndex);
 816            }
 817        }
 818
 819        // next item
 820        lastIndex = currIndex;
 821        currIndex = nextIndex;
 822     } while (!allItemsInBoundDone);
 823
 824     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 825
 826     m_band.lastSelectionOrigin = m_band.origin;
 827     m_band.lastSelectionDestination = m_band.destination;
 828     m_band.ignoreOldInfo = false;
 829 }
 830
 831 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 832 {
 833     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 834     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 835     setIconSize(QSize(iconSize, iconSize));
 836     m_decorationSize = QSize(iconSize, iconSize);
 837
 838     if (m_selectionManager != 0) {
 839         m_selectionManager->reset();
 840     }
 841
 842     doItemsLayout();
 843 }
 844
 845 QPoint DolphinDetailsView::contentsPos() const
 846 {
 847     // implementation note: the horizonal position is ignored currently, as no
 848     // horizontal scrolling is done anyway during a selection
 849     const QScrollBar* scrollbar = verticalScrollBar();
 850     Q_ASSERT(scrollbar != 0);
 851
 852     const int maxHeight = maximumViewportSize().height();
 853     const int height = scrollbar->maximum() - scrollbar->minimum() + 1;
 854     const int visibleHeight = model()->rowCount() + 1 - height;
 855     if (visibleHeight <= 0) {
 856         return QPoint(0, 0);
 857     }
 858
 859     const int y = scrollbar->sliderPosition() * maxHeight / visibleHeight;
 860     return QPoint(0, y);
 861 }
 862
 863 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 864 {
 865     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 866
 867     switch (columnIndex) {
 868     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 869     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 870     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 871     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 872     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 873     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 874     default: break;
 875     }
 876
 877     return info;
 878 }
 879
 880 void DolphinDetailsView::resizeColumns()
 881 {
 882     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 883     // around 3 seconds for each (!) resize operation when having > 10000 items).
 884     // This gets a problem especially when opening large directories, where several
 885     // resize operations are received for showing the currently available items during
 886     // loading (the application hangs around 20 seconds when loading > 10000 items).
 887
 888     QHeaderView* headerView = header();
 889     QFontMetrics fontMetrics(viewport()->font());
 890
 891     int columnWidth[KDirModel::ColumnCount];
 892     columnWidth[KDirModel::Size] = fontMetrics.width("00000 Items");
 893     columnWidth[KDirModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 894     columnWidth[KDirModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 895     columnWidth[KDirModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 896     columnWidth[KDirModel::Group] = fontMetrics.width("xxxxxxxxxx");
 897     columnWidth[KDirModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
 898
 899     int requiredWidth = 0;
 900     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
 901         if (!isColumnHidden(i)) {
 902             columnWidth[i] += 20; // provide a default gap
 903             requiredWidth += columnWidth[i];
 904             headerView->resizeSection(i, columnWidth[i]);
 905         }
 906     }
 907
 908     // resize the name column in a way that the whole available width is used
 909     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 910     if (columnWidth[KDirModel::Name] < 120) {
 911         columnWidth[KDirModel::Name] = 120;
 912     }
 913     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
 914 }
 915
 916 QRect DolphinDetailsView::nameColumnRect(const QModelIndex& index) const
 917 {
 918     QRect rect = visualRect(index);
 919     const KFileItem item = m_controller->itemForIndex(index);
 920     if (!item.isNull()) {
 921         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 922         rect.setWidth(width);
 923     }
 924
 925     return rect;
 926 }
 927
 928 DolphinDetailsView::ElasticBand::ElasticBand() :
 929     show(false),
 930     origin(),
 931     destination(),
 932     lastSelectionOrigin(),
 933     lastSelectionDestination(),
 934     ignoreOldInfo(true),
 935     outsideNearestLeftEdge(0),
 936     outsideNearestRightEdge(0),
 937     insideNearestLeftEdge(0),
 938     insideNearestRightEdge(0)
 939 {
 940 }
 941
 942 #include "dolphindetailsview.moc"