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     } else if (event->type() == QEvent::UpdateRequest) {
 173         // a wheel movement will scroll 4 items
 174         if (model()->rowCount() > 0) {
 175             verticalScrollBar()->setSingleStep((sizeHintForRow(0) / 3) * 4);
 176         }
 177     }
 178
 179     return QTreeView::event(event);
 180 }
 181
 182 QStyleOptionViewItem DolphinDetailsView::viewOptions() const
 183 {
 184     QStyleOptionViewItem viewOptions = QTreeView::viewOptions();
 185     viewOptions.font = m_font;
 186     viewOptions.showDecorationSelected = true;
 187     viewOptions.decorationSize = m_decorationSize;
 188     return viewOptions;
 189 }
 190
 191 void DolphinDetailsView::contextMenuEvent(QContextMenuEvent* event)
 192 {
 193     QTreeView::contextMenuEvent(event);
 194     m_controller->triggerContextMenuRequest(event->pos());
 195 }
 196
 197 void DolphinDetailsView::mousePressEvent(QMouseEvent* event)
 198 {
 199     m_controller->requestActivation();
 200
 201     const QModelIndex current = currentIndex();
 202     QTreeView::mousePressEvent(event);
 203
 204     m_expandingTogglePressed = false;
 205     const QModelIndex index = indexAt(event->pos());
 206     const bool updateState = index.isValid() &&
 207                              (index.column() == DolphinModel::Name) &&
 208                              (event->button() == Qt::LeftButton);
 209     if (updateState) {
 210         // TODO: See comment in DolphinIconsView::mousePressEvent(). Only update
 211         // the state if no expanding/collapsing area has been hit:
 212         const QRect rect = visualRect(index);
 213         if (event->pos().x() >= rect.x() + indentation()) {
 214             setState(QAbstractItemView::DraggingState);
 215         } else {
 216             m_expandingTogglePressed = true;
 217             kDebug() << "m_expandingTogglePressed " << m_expandingTogglePressed;
 218         }
 219     }
 220
 221     if (!index.isValid() || (index.column() != DolphinModel::Name)) {
 222         // the mouse press is done somewhere outside the filename column
 223         if (QApplication::mouseButtons() & Qt::MidButton) {
 224             m_controller->replaceUrlByClipboard();
 225         }
 226
 227         const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
 228         if (!(modifier & Qt::ShiftModifier) && !(modifier & Qt::ControlModifier)) {
 229             clearSelection();
 230         }
 231
 232         // restore the current index, other columns are handled as viewport area.
 233         // setCurrentIndex(...) implicitly calls scrollTo(...), which we want to ignore.
 234         m_ignoreScrollTo = true;
 235         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 236         m_ignoreScrollTo = false;
 237
 238         if ((event->button() == Qt::LeftButton) && !m_expandingTogglePressed) {
 239             // Inform Qt about what we are doing - otherwise it starts dragging items around!
 240             setState(DragSelectingState);
 241             m_band.show = true;
 242             // Incremental update data will not be useful - start from scratch.
 243             m_band.ignoreOldInfo = true;
 244             const QPoint pos = contentsPos();
 245             const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 246             m_band.origin = event->pos() + pos + scrollPos;
 247             m_band.destination = m_band.origin;
 248             m_band.originalSelection = selectionModel()->selection();
 249         }
 250     }
 251 }
 252
 253 void DolphinDetailsView::mouseMoveEvent(QMouseEvent* event)
 254 {
 255     if (m_band.show) {
 256         const QPoint mousePos = event->pos();
 257         const QModelIndex index = indexAt(mousePos);
 258         if (!index.isValid()) {
 259             // the destination of the selection rectangle is above the viewport. In this
 260             // case QTreeView does no selection at all, which is not the wanted behavior
 261             // in Dolphin -> select all items within the elastic band rectangle
 262             updateElasticBandSelection();
 263         }
 264
 265         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 266         // as the Qt-issue #199631 has been fixed.
 267         // QTreeView::mouseMoveEvent(event);
 268         QAbstractItemView::mouseMoveEvent(event);
 269         updateElasticBand();
 270     } else {
 271         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 272         // as the Qt-issue #199631 has been fixed.
 273         // QTreeView::mouseMoveEvent(event);
 274         QAbstractItemView::mouseMoveEvent(event);
 275     }
 276
 277     if (m_expandingTogglePressed) {
 278         // Per default QTreeView starts either a selection or a drag operation when dragging
 279         // the expanding toggle button (Qt-issue - see TODO comment in DolphinIconsView::mousePressEvent()).
 280         // Turn off this behavior in Dolphin to stay predictable:
 281         clearSelection();
 282         setState(QAbstractItemView::NoState);
 283     }
 284 }
 285
 286 void DolphinDetailsView::mouseReleaseEvent(QMouseEvent* event)
 287 {
 288     const QModelIndex index = indexAt(event->pos());
 289     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 290         QTreeView::mouseReleaseEvent(event);
 291     } else {
 292         // don't change the current index if the cursor is released
 293         // above any other column than the name column, as the other
 294         // columns act as viewport
 295         const QModelIndex current = currentIndex();
 296         QTreeView::mouseReleaseEvent(event);
 297         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 298     }
 299
 300     m_expandingTogglePressed = false;
 301     if (m_band.show) {
 302         setState(NoState);
 303         updateElasticBand();
 304         m_band.show = false;
 305     }
 306 }
 307
 308 void DolphinDetailsView::startDrag(Qt::DropActions supportedActions)
 309 {
 310     DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 311     m_band.show = false;
 312 }
 313
 314 void DolphinDetailsView::dragEnterEvent(QDragEnterEvent* event)
 315 {
 316     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 317         event->acceptProposedAction();
 318     }
 319
 320     if (m_band.show) {
 321         updateElasticBand();
 322         m_band.show = false;
 323     }
 324 }
 325
 326 void DolphinDetailsView::dragLeaveEvent(QDragLeaveEvent* event)
 327 {
 328     QTreeView::dragLeaveEvent(event);
 329     setDirtyRegion(m_dropRect);
 330 }
 331
 332 void DolphinDetailsView::dragMoveEvent(QDragMoveEvent* event)
 333 {
 334     QTreeView::dragMoveEvent(event);
 335
 336     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 337     setDirtyRegion(m_dropRect);
 338     const QModelIndex index = indexAt(event->pos());
 339     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 340         const KFileItem item = m_controller->itemForIndex(index);
 341         if (!item.isNull() && item.isDir()) {
 342             m_dropRect = visualRect(index);
 343         } else {
 344             m_dropRect.setSize(QSize()); // set as invalid
 345         }
 346         setDirtyRegion(m_dropRect);
 347     }
 348
 349     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 350         // accept url drops, independently from the destination item
 351         event->acceptProposedAction();
 352     }
 353 }
 354
 355 void DolphinDetailsView::dropEvent(QDropEvent* event)
 356 {
 357     const QModelIndex index = indexAt(event->pos());
 358     KFileItem item;
 359     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 360         item = m_controller->itemForIndex(index);
 361     }
 362     m_controller->indicateDroppedUrls(item, m_controller->url(), event);
 363     QTreeView::dropEvent(event);
 364 }
 365
 366 void DolphinDetailsView::paintEvent(QPaintEvent* event)
 367 {
 368     QTreeView::paintEvent(event);
 369     if (m_band.show) {
 370         // The following code has been taken from QListView
 371         // and adapted to DolphinDetailsView.
 372         // (C) 1992-2007 Trolltech ASA
 373         QStyleOptionRubberBand opt;
 374         opt.initFrom(this);
 375         opt.shape = QRubberBand::Rectangle;
 376         opt.opaque = false;
 377         opt.rect = elasticBandRect();
 378
 379         QPainter painter(viewport());
 380         painter.save();
 381         style()->drawControl(QStyle::CE_RubberBand, &opt, &painter);
 382         painter.restore();
 383     }
 384 }
 385
 386 void DolphinDetailsView::keyPressEvent(QKeyEvent* event)
 387 {
 388     // If the Control modifier is pressed, a multiple selection
 389     // is done and DolphinDetailsView::currentChanged() may not
 390     // not change the selection in a custom way.
 391     m_keyPressed = !(event->modifiers() & Qt::ControlModifier);
 392
 393     QTreeView::keyPressEvent(event);
 394     m_controller->handleKeyPressEvent(event);
 395 }
 396
 397 void DolphinDetailsView::keyReleaseEvent(QKeyEvent* event)
 398 {
 399     QTreeView::keyReleaseEvent(event);
 400     m_keyPressed = false;
 401 }
 402
 403 void DolphinDetailsView::resizeEvent(QResizeEvent* event)
 404 {
 405     QTreeView::resizeEvent(event);
 406     if (m_autoResize) {
 407         resizeColumns();
 408     }
 409 }
 410
 411 void DolphinDetailsView::wheelEvent(QWheelEvent* event)
 412 {
 413     if (m_selectionManager != 0) {
 414         m_selectionManager->reset();
 415     }
 416
 417     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 418     if (event->modifiers() & Qt::ControlModifier) {
 419         event->ignore();
 420         return;
 421     }
 422
 423     QTreeView::wheelEvent(event);
 424 }
 425
 426 void DolphinDetailsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 427 {
 428     QTreeView::currentChanged(current, previous);
 429
 430     // Stay consistent with QListView: When changing the current index by key presses,
 431     // also change the selection.
 432     if (m_keyPressed) {
 433         selectionModel()->select(current, QItemSelectionModel::ClearAndSelect);
 434     }
 435 }
 436
 437 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 438 {
 439     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 440         // if the mouse is above an item and moved very fast outside the widget,
 441         // no viewportEntered() signal might be emitted although the mouse has been moved
 442         // above the viewport
 443         m_controller->emitViewportEntered();
 444     }
 445
 446     return QTreeView::eventFilter(watched, event);
 447 }
 448
 449 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 450 {
 451     // the blank portion of the name column counts as empty space
 452     const QModelIndex index = QTreeView::indexAt(point);
 453     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 454                                     (index.column() == KDirModel::Name) && !nameColumnRect(index).contains(point);
 455     return isAboveEmptySpace ? QModelIndex() : index;
 456 }
 457
 458 void DolphinDetailsView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
 459 {
 460     // We must override setSelection() as Qt calls it internally and when this happens
 461     // we must ensure that the default indexAt() is used.
 462     if (!m_band.show) {
 463         m_useDefaultIndexAt = true;
 464         QTreeView::setSelection(rect, command);
 465         m_useDefaultIndexAt = false;
 466     } else {
 467
 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         return;
 477     QTreeView::scrollTo(index, hint);
 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         if (m_band.destination.x() < 0)
 522             m_band.destination.setX(0);
 523
 524         dirtyRegion = dirtyRegion.united(elasticBandRect());
 525         setDirtyRegion(dirtyRegion);
 526     }
 527 }
 528
 529 QRect DolphinDetailsView::elasticBandRect() const
 530 {
 531     const QPoint pos(contentsPos());
 532     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 533
 534     const QPoint topLeft = m_band.origin - pos - scrollPos;
 535     const QPoint bottomRight = m_band.destination - pos - scrollPos;
 536     return QRect(topLeft, bottomRight).normalized();
 537 }
 538
 539 void DolphinDetailsView::setZoomLevel(int level)
 540 {
 541     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 542     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 543
 544     const bool showPreview = m_controller->dolphinView()->showPreview();
 545     if (showPreview) {
 546         settings->setPreviewSize(size);
 547     } else {
 548         settings->setIconSize(size);
 549     }
 550
 551     updateDecorationSize(showPreview);
 552 }
 553
 554
 555 void DolphinDetailsView::slotShowPreviewChanged()
 556 {
 557     const DolphinView* view = m_controller->dolphinView();
 558     updateDecorationSize(view->showPreview());
 559 }
 560
 561 void DolphinDetailsView::configureColumns(const QPoint& pos)
 562 {
 563     KMenu popup(this);
 564     popup.addTitle(i18nc("@title:menu", "Columns"));
 565
 566     QHeaderView* headerView = header();
 567     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 568         const int logicalIndex = headerView->logicalIndex(i);
 569         const QString text = model()->headerData(i, Qt::Horizontal).toString();
 570         QAction* action = popup.addAction(text);
 571         action->setCheckable(true);
 572         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 573         action->setData(i);
 574     }
 575
 576     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 577     if (activatedAction != 0) {
 578         const bool show = activatedAction->isChecked();
 579         const int columnIndex = activatedAction->data().toInt();
 580
 581         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 582         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 583         if (show) {
 584             Q_ASSERT(!list.contains(info));
 585             list.append(info);
 586         } else {
 587             Q_ASSERT(list.contains(info));
 588             const int index = list.indexOf(info);
 589             list.removeAt(index);
 590         }
 591
 592         m_controller->indicateAdditionalInfoChange(list);
 593         setColumnHidden(columnIndex, !show);
 594         resizeColumns();
 595     }
 596 }
 597
 598 void DolphinDetailsView::updateColumnVisibility()
 599 {
 600     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 601     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 602         const KFileItemDelegate::Information info = infoForColumn(i);
 603         const bool hide = !list.contains(info);
 604         if (isColumnHidden(i) != hide) {
 605             setColumnHidden(i, hide);
 606         }
 607     }
 608
 609     resizeColumns();
 610 }
 611
 612 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 613 {
 614     Q_UNUSED(logicalIndex);
 615     Q_UNUSED(oldSize);
 616     Q_UNUSED(newSize);
 617     // If the user changes the size of the headers, the autoresize feature should be
 618     // turned off. As there is no dedicated interface to find out whether the header
 619     // section has been resized by the user or by a resize event, the following approach is used:
 620     if ((QApplication::mouseButtons() & Qt::LeftButton) && isVisible()) {
 621         disableAutoResizing();
 622     }
 623 }
 624
 625 void DolphinDetailsView::slotActivationChanged(bool active)
 626 {
 627     setAlternatingRowColors(active);
 628 }
 629
 630 void DolphinDetailsView::disableAutoResizing()
 631 {
 632     m_autoResize = false;
 633 }
 634
 635 void DolphinDetailsView::requestActivation()
 636 {
 637     m_controller->requestActivation();
 638 }
 639
 640 void DolphinDetailsView::updateFont()
 641 {
 642     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 643     Q_ASSERT(settings != 0);
 644
 645     if (settings->useSystemFont()) {
 646         m_font = KGlobalSettings::generalFont();
 647     }
 648 }
 649
 650 void DolphinDetailsView::updateElasticBandSelection()
 651 {
 652     if (!m_band.show) {
 653         return;
 654     }
 655
 656     // Ensure the elastic band itself is up-to-date, in
 657     // case we are being called due to e.g. a drag event.
 658     updateElasticBand();
 659
 660     // Clip horizontally to the name column, as some filenames will be
 661     // longer than the column.  We don't clip vertically as origin
 662     // may be above or below the current viewport area.
 663     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 664     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 665     QRect selRect = elasticBandRect().normalized();
 666     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 667     selRect = nameColumnArea.intersect(selRect).normalized();
 668     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 669     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 670     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 671
 672     if (selRect.isNull()) {
 673         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 674         m_band.ignoreOldInfo = true;
 675         return;
 676     }
 677
 678     if (!m_band.ignoreOldInfo) {
 679         // Do some quick checks to see if we can rule out the need to
 680         // update the selection.
 681         Q_ASSERT(uniformRowHeights());
 682         QModelIndex dummyIndex = model()->index(0, 0);
 683         if (!dummyIndex.isValid()) {
 684             // No items in the model presumably.
 685             return;
 686         }
 687
 688         // If the elastic band does not cover the same rows as before, we'll
 689         // need to re-check, and also invalidate the old item distances.
 690         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 691         const bool coveringSameRows =
 692             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 693             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 694         if (coveringSameRows) {
 695             // Covering the same rows, but have we moved far enough horizontally
 696             // that we might have (de)selected some other items?
 697             const bool itemSelectionChanged =
 698                 ((selRect.left() > oldSelRect.left()) &&
 699                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 700                 ((selRect.left() < oldSelRect.left()) &&
 701                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 702                 ((selRect.right() < oldSelRect.right()) &&
 703                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 704                 ((selRect.right() > oldSelRect.right()) &&
 705                  (selRect.right() >= m_band.outsideNearestRightEdge));
 706
 707             if (!itemSelectionChanged) {
 708                 return;
 709             }
 710         }
 711     }
 712     else {
 713         // This is the only piece of optimization data that needs to be explicitly
 714         // discarded.
 715         m_band.lastSelectionOrigin = QPoint();
 716         m_band.lastSelectionDestination = QPoint();
 717         oldSelRect = selRect;
 718     }
 719
 720     // Do the selection from scratch. Force a update of the horizontal distances info.
 721     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 722     m_band.insideNearestRightEdge  = nameColumnX - 1;
 723     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 724     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 725
 726     // Include the old selection rect as well, so we can deselect
 727     // items that were inside it but not in the new selRect.
 728     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 729     if (boundingRect.isNull()) {
 730         return;
 731     }
 732
 733     // Get the index of the item in this row in the name column.
 734     // TODO - would this still work if the columns could be re-ordered?
 735     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 736     if (startIndex.parent().isValid()) {
 737         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 738     } else {
 739         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 740     }
 741     if (!startIndex.isValid()) {
 742         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 743         m_band.ignoreOldInfo = true;
 744         return;
 745     }
 746
 747    // Go through all indexes between the top and bottom of boundingRect, and
 748    // update the selection.
 749    const int verticalCutoff = boundingRect.bottom();
 750    QModelIndex currIndex = startIndex;
 751    QModelIndex lastIndex;
 752    bool allItemsInBoundDone = false;
 753
 754    // Calling selectionModel()->select(...) for each item that needs to be
 755    // toggled is slow as each call emits selectionChanged(...) so store them
 756    // and do the selection toggle in one batch.
 757    QItemSelection itemsToToggle;
 758    // QItemSelection's deal with continuous ranges of indexes better than
 759    // single indexes, so try to portion items that need to be toggled into ranges.
 760    bool formingToggleIndexRange = false;
 761    QModelIndex toggleIndexRangeBegin = QModelIndex();
 762
 763    do {
 764        QRect currIndexRect = nameColumnRect(currIndex);
 765
 766         // Update some optimization info as we go.
 767        const int cr = currIndexRect.right();
 768        const int cl = currIndexRect.left();
 769        const int sl = selRect.left();
 770        const int sr = selRect.right();
 771        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 772        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 773            m_band.outsideNearestLeftEdge = cr;
 774        }
 775        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 776            m_band.outsideNearestRightEdge = cl;
 777        }
 778        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 779            m_band.insideNearestRightEdge = cl;
 780        }
 781        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 782            m_band.insideNearestLeftEdge = cr;
 783        }
 784
 785        bool currentlySelected = selectionModel()->isSelected(currIndex);
 786        bool originallySelected = m_band.originalSelection.contains(currIndex);
 787        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 788        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 789        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 790        if (needToToggleItem && !formingToggleIndexRange) {
 791             toggleIndexRangeBegin = currIndex;
 792             formingToggleIndexRange = true;
 793        }
 794
 795        // NOTE: indexBelow actually walks up and down expanded trees for us.
 796        QModelIndex nextIndex = indexBelow(currIndex);
 797        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 798
 799        const bool commitToggleIndexRange = formingToggleIndexRange &&
 800                                            (!needToToggleItem ||
 801                                             allItemsInBoundDone ||
 802                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 803        if (commitToggleIndexRange) {
 804            formingToggleIndexRange = false;
 805             // If this is the last item in the bounds and it is also the beginning of a range,
 806             // don't toggle lastIndex - it will already have been dealt with.
 807            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 808                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 809            }
 810             // Need to start a new range immediately with currIndex?
 811            if (needToToggleItem) {
 812                toggleIndexRangeBegin = currIndex;
 813                formingToggleIndexRange = true;
 814            }
 815            if (allItemsInBoundDone && needToToggleItem) {
 816                 // Toggle the very last item in the bounds.
 817                itemsToToggle.select(currIndex, currIndex);
 818            }
 819        }
 820
 821        // next item
 822        lastIndex = currIndex;
 823        currIndex = nextIndex;
 824     } while (!allItemsInBoundDone);
 825
 826     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 827
 828     m_band.lastSelectionOrigin = m_band.origin;
 829     m_band.lastSelectionDestination = m_band.destination;
 830     m_band.ignoreOldInfo = false;
 831 }
 832
 833 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 834 {
 835     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 836     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 837     setIconSize(QSize(iconSize, iconSize));
 838     m_decorationSize = QSize(iconSize, iconSize);
 839
 840     if (m_selectionManager != 0) {
 841         m_selectionManager->reset();
 842     }
 843
 844     doItemsLayout();
 845 }
 846
 847 QPoint DolphinDetailsView::contentsPos() const
 848 {
 849     // implementation note: the horizonal position is ignored currently, as no
 850     // horizontal scrolling is done anyway during a selection
 851     const QScrollBar* scrollbar = verticalScrollBar();
 852     Q_ASSERT(scrollbar != 0);
 853
 854     const int maxHeight = maximumViewportSize().height();
 855     const int height = scrollbar->maximum() - scrollbar->minimum() + 1;
 856     const int visibleHeight = model()->rowCount() + 1 - height;
 857     if (visibleHeight <= 0) {
 858         return QPoint(0, 0);
 859     }
 860
 861     const int y = scrollbar->sliderPosition() * maxHeight / visibleHeight;
 862     return QPoint(0, y);
 863 }
 864
 865 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 866 {
 867     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 868
 869     switch (columnIndex) {
 870     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 871     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 872     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 873     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 874     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 875     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 876     default: break;
 877     }
 878
 879     return info;
 880 }
 881
 882 void DolphinDetailsView::resizeColumns()
 883 {
 884     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 885     // around 3 seconds for each (!) resize operation when having > 10000 items).
 886     // This gets a problem especially when opening large directories, where several
 887     // resize operations are received for showing the currently available items during
 888     // loading (the application hangs around 20 seconds when loading > 10000 items).
 889
 890     QHeaderView* headerView = header();
 891     QFontMetrics fontMetrics(viewport()->font());
 892
 893     int columnWidth[KDirModel::ColumnCount];
 894     columnWidth[KDirModel::Size] = fontMetrics.width("00000 Items");
 895     columnWidth[KDirModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 896     columnWidth[KDirModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 897     columnWidth[KDirModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 898     columnWidth[KDirModel::Group] = fontMetrics.width("xxxxxxxxxx");
 899     columnWidth[KDirModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
 900
 901     int requiredWidth = 0;
 902     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
 903         if (!isColumnHidden(i)) {
 904             columnWidth[i] += 20; // provide a default gap
 905             requiredWidth += columnWidth[i];
 906             headerView->resizeSection(i, columnWidth[i]);
 907         }
 908     }
 909
 910     // resize the name column in a way that the whole available width is used
 911     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 912     if (columnWidth[KDirModel::Name] < 120) {
 913         columnWidth[KDirModel::Name] = 120;
 914     }
 915     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
 916 }
 917
 918 QRect DolphinDetailsView::nameColumnRect(const QModelIndex& index) const
 919 {
 920     QRect rect = visualRect(index);
 921     const KFileItem item = m_controller->itemForIndex(index);
 922     if (!item.isNull()) {
 923         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 924         rect.setWidth(width);
 925     }
 926
 927     return rect;
 928 }
 929
 930 DolphinDetailsView::ElasticBand::ElasticBand() :
 931     show(false),
 932     origin(),
 933     destination(),
 934     lastSelectionOrigin(),
 935     lastSelectionDestination(),
 936     ignoreOldInfo(true),
 937     outsideNearestLeftEdge(0),
 938     outsideNearestRightEdge(0),
 939     insideNearestLeftEdge(0),
 940     insideNearestRightEdge(0)
 941 {
 942 }
 943
 944 #include "dolphindetailsview.moc"