src/dolphindetailsview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz (peter.penz@gmx.at)                  *
   3  *   Copyright (C) 2008 by Simon St. James (kdedevel@etotheipiplusone.com) *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  19  ***************************************************************************/
  20
  21 #include "dolphindetailsview.h"
  22
  23 #include "dolphinmodel.h"
  24 #include "dolphincontroller.h"
  25 #include "dolphinfileitemdelegate.h"
  26 #include "settings/dolphinsettings.h"
  27 #include "dolphinsortfilterproxymodel.h"
  28 #include "dolphinviewautoscroller.h"
  29 #include "draganddrophelper.h"
  30 #include "viewextensionsfactory.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 <QAction>
  42 #include <QApplication>
  43 #include <QHeaderView>
  44 #include <QRubberBand>
  45 #include <QPainter>
  46 #include <QScrollBar>
  47
  48 DolphinDetailsView::DolphinDetailsView(QWidget* parent,
  49                                        DolphinController* controller,
  50                                        DolphinSortFilterProxyModel* proxyModel) :
  51     QTreeView(parent),
  52     m_autoResize(true),
  53     m_expandingTogglePressed(false),
  54     m_keyPressed(false),
  55     m_useDefaultIndexAt(true),
  56     m_ignoreScrollTo(false),
  57     m_controller(controller),
  58     m_extensionsFactory(0),
  59     m_expandableFoldersAction(0),
  60     m_expandedUrls(),
  61     m_font(),
  62     m_decorationSize(),
  63     m_band()
  64 {
  65     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
  66     Q_ASSERT(settings != 0);
  67     Q_ASSERT(controller != 0);
  68
  69     setLayoutDirection(Qt::LeftToRight);
  70     setAcceptDrops(true);
  71     setSortingEnabled(true);
  72     setUniformRowHeights(true);
  73     setSelectionBehavior(SelectItems);
  74     setDragDropMode(QAbstractItemView::DragDrop);
  75     setDropIndicatorShown(false);
  76     setAlternatingRowColors(true);
  77     setRootIsDecorated(settings->expandableFolders());
  78     setItemsExpandable(settings->expandableFolders());
  79     setEditTriggers(QAbstractItemView::NoEditTriggers);
  80     setModel(proxyModel);
  81
  82     setMouseTracking(true);
  83
  84     const ViewProperties props(controller->url());
  85     setSortIndicatorSection(props.sorting());
  86     setSortIndicatorOrder(props.sortOrder());
  87
  88     QHeaderView* headerView = header();
  89     connect(headerView, SIGNAL(sectionClicked(int)),
  90             this, SLOT(synchronizeSortingState(int)));
  91     headerView->setContextMenuPolicy(Qt::CustomContextMenu);
  92     connect(headerView, SIGNAL(customContextMenuRequested(const QPoint&)),
  93             this, SLOT(configureSettings(const QPoint&)));
  94     connect(headerView, SIGNAL(sectionResized(int, int, int)),
  95             this, SLOT(slotHeaderSectionResized(int, int, int)));
  96     connect(headerView, SIGNAL(sectionHandleDoubleClicked(int)),
  97             this, SLOT(disableAutoResizing()));
  98
  99     connect(parent, SIGNAL(sortingChanged(DolphinView::Sorting)),
 100             this, SLOT(setSortIndicatorSection(DolphinView::Sorting)));
 101     connect(parent, SIGNAL(sortOrderChanged(Qt::SortOrder)),
 102             this, SLOT(setSortIndicatorOrder(Qt::SortOrder)));
 103
 104     connect(this, SIGNAL(clicked(const QModelIndex&)),
 105             controller, SLOT(requestTab(const QModelIndex&)));
 106     if (KGlobalSettings::singleClick()) {
 107         connect(this, SIGNAL(clicked(const QModelIndex&)),
 108                 controller, SLOT(triggerItem(const QModelIndex&)));
 109     } else {
 110         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 111                 controller, SLOT(triggerItem(const QModelIndex&)));
 112     }
 113
 114     connect(this, SIGNAL(entered(const QModelIndex&)),
 115             this, SLOT(slotEntered(const QModelIndex&)));
 116     connect(this, SIGNAL(viewportEntered()),
 117             controller, SLOT(emitViewportEntered()));
 118     connect(controller, SIGNAL(zoomLevelChanged(int)),
 119             this, SLOT(setZoomLevel(int)));
 120     connect(controller->dolphinView(), SIGNAL(additionalInfoChanged()),
 121             this, SLOT(updateColumnVisibility()));
 122     connect(controller, SIGNAL(activationChanged(bool)),
 123             this, SLOT(slotActivationChanged(bool)));
 124
 125     if (settings->useSystemFont()) {
 126         m_font = KGlobalSettings::generalFont();
 127     } else {
 128         m_font = QFont(settings->fontFamily(),
 129                        settings->fontSize(),
 130                        settings->fontWeight(),
 131                        settings->italicFont());
 132     }
 133
 134     setVerticalScrollMode(QTreeView::ScrollPerPixel);
 135     setHorizontalScrollMode(QTreeView::ScrollPerPixel);
 136
 137     const DolphinView* view = controller->dolphinView();
 138     connect(view, SIGNAL(showPreviewChanged()),
 139             this, SLOT(slotShowPreviewChanged()));
 140
 141
 142     setFocus();
 143     viewport()->installEventFilter(this);
 144
 145     connect(KGlobalSettings::self(), SIGNAL(settingsChanged(int)),
 146             this, SLOT(slotGlobalSettingsChanged(int)));
 147
 148     m_useDefaultIndexAt = false;
 149
 150     m_expandableFoldersAction = new QAction(i18nc("@option:check", "Expandable Folders"), this);
 151     m_expandableFoldersAction->setCheckable(true);
 152     connect(m_expandableFoldersAction, SIGNAL(toggled(bool)),
 153             this, SLOT(setFoldersExpandable(bool)));
 154
 155     connect(this, SIGNAL(expanded(const QModelIndex&)), this, SLOT(slotExpanded(const QModelIndex&)));
 156     connect(this, SIGNAL(collapsed(const QModelIndex&)), this, SLOT(slotCollapsed(const QModelIndex&)));
 157
 158     updateDecorationSize(view->showPreview());
 159
 160     m_extensionsFactory = new ViewExtensionsFactory(this, controller);
 161     m_extensionsFactory->fileItemDelegate()->setMinimizedNameColumn(true);
 162     m_extensionsFactory->setAutoFolderExpandingEnabled(settings->expandableFolders());
 163 }
 164
 165 DolphinDetailsView::~DolphinDetailsView()
 166 {
 167 }
 168
 169 QSet<KUrl> DolphinDetailsView::expandedUrls() const
 170 {
 171     return m_expandedUrls;
 172 }
 173
 174 QRegion DolphinDetailsView::visualRegionForSelection(const QItemSelection &selection) const
 175 {
 176     // We have to make sure that the visualRect of each model index is inside the region.
 177     // QTreeView::visualRegionForSelection does not do it right because it assumes implicitly
 178     // that all visualRects have the same width, which is in general not the case here.
 179     QRegion selectionRegion;
 180     const QModelIndexList indexes = selection.indexes();
 181
 182     foreach(const QModelIndex& index, indexes) {
 183         selectionRegion += visualRect(index);
 184     }
 185
 186     return selectionRegion;
 187 }
 188
 189 bool DolphinDetailsView::event(QEvent* event)
 190 {
 191     if (event->type() == QEvent::Polish) {
 192         header()->setResizeMode(QHeaderView::Interactive);
 193         updateColumnVisibility();
 194     }
 195
 196     return QTreeView::event(event);
 197 }
 198
 199 QStyleOptionViewItem DolphinDetailsView::viewOptions() const
 200 {
 201     QStyleOptionViewItem viewOptions = QTreeView::viewOptions();
 202     viewOptions.font = m_font;
 203     viewOptions.fontMetrics = QFontMetrics(m_font);
 204     viewOptions.showDecorationSelected = true;
 205     viewOptions.decorationSize = m_decorationSize;
 206     return viewOptions;
 207 }
 208
 209 void DolphinDetailsView::contextMenuEvent(QContextMenuEvent* event)
 210 {
 211     QTreeView::contextMenuEvent(event);
 212
 213     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 214     m_expandableFoldersAction->setChecked(settings->expandableFolders());
 215     m_controller->triggerContextMenuRequest(event->pos(),
 216                                             QList<QAction*>() << m_expandableFoldersAction);
 217 }
 218
 219 void DolphinDetailsView::mousePressEvent(QMouseEvent* event)
 220 {
 221     m_controller->requestActivation();
 222
 223     const QModelIndex current = currentIndex();
 224     QTreeView::mousePressEvent(event);
 225
 226     m_expandingTogglePressed = isAboveExpandingToggle(event->pos());
 227
 228     const QModelIndex index = indexAt(event->pos());
 229     const bool updateState = index.isValid() &&
 230                              (index.column() == DolphinModel::Name) &&
 231                              (event->button() == Qt::LeftButton);
 232     if (updateState) {
 233         setState(QAbstractItemView::DraggingState);
 234     }
 235
 236     if (!index.isValid() || (index.column() != DolphinModel::Name)) {
 237         // the mouse press is done somewhere outside the filename column
 238         if (QApplication::mouseButtons() & Qt::MidButton) {
 239             m_controller->replaceUrlByClipboard();
 240         }
 241
 242         const Qt::KeyboardModifiers mod = QApplication::keyboardModifiers();
 243         if (!m_expandingTogglePressed && !(mod & Qt::ShiftModifier) && !(mod & Qt::ControlModifier)) {
 244             clearSelection();
 245         }
 246
 247         // restore the current index, other columns are handled as viewport area.
 248         // setCurrentIndex(...) implicitly calls scrollTo(...), which we want to ignore.
 249         m_ignoreScrollTo = true;
 250         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 251         m_ignoreScrollTo = false;
 252
 253         if ((event->button() == Qt::LeftButton) && !m_expandingTogglePressed) {
 254             // Inform Qt about what we are doing - otherwise it starts dragging items around!
 255             setState(DragSelectingState);
 256             m_band.show = true;
 257             // Incremental update data will not be useful - start from scratch.
 258             m_band.ignoreOldInfo = true;
 259             const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 260             m_band.origin = event->pos()  + scrollPos;
 261             m_band.destination = m_band.origin;
 262             m_band.originalSelection = selectionModel()->selection();
 263         }
 264     }
 265 }
 266
 267 void DolphinDetailsView::mouseMoveEvent(QMouseEvent* event)
 268 {
 269     if (m_expandingTogglePressed) {
 270         // Per default QTreeView starts either a selection or a drag operation when dragging
 271         // the expanding toggle button (Qt-issue - see TODO comment in DolphinIconsView::mousePressEvent()).
 272         // Turn off this behavior in Dolphin to stay predictable:
 273         setState(QAbstractItemView::NoState);
 274         return;
 275     }
 276
 277     if (m_band.show) {
 278         const QPoint mousePos = event->pos();
 279         const QModelIndex index = indexAt(mousePos);
 280         if (!index.isValid()) {
 281             // the destination of the selection rectangle is above the viewport. In this
 282             // case QTreeView does no selection at all, which is not the wanted behavior
 283             // in Dolphin -> select all items within the elastic band rectangle
 284             updateElasticBandSelection();
 285         }
 286
 287         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 288         // as the Qt-issue #199631 has been fixed.
 289         // QTreeView::mouseMoveEvent(event);
 290         QAbstractItemView::mouseMoveEvent(event);
 291         updateElasticBand();
 292     } else {
 293         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 294         // as the Qt-issue #199631 has been fixed.
 295         // QTreeView::mouseMoveEvent(event);
 296         QAbstractItemView::mouseMoveEvent(event);
 297     }
 298 }
 299
 300 void DolphinDetailsView::mouseReleaseEvent(QMouseEvent* event)
 301 {
 302     if (!m_expandingTogglePressed) {
 303         const QModelIndex index = indexAt(event->pos());
 304         if (index.isValid() && (index.column() == DolphinModel::Name)) {
 305             QTreeView::mouseReleaseEvent(event);
 306         } else {
 307             // don't change the current index if the cursor is released
 308             // above any other column than the name column, as the other
 309             // columns act as viewport
 310             const QModelIndex current = currentIndex();
 311             QTreeView::mouseReleaseEvent(event);
 312             selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 313         }
 314     }
 315     m_expandingTogglePressed = false;
 316
 317     if (m_band.show) {
 318         setState(NoState);
 319         updateElasticBand();
 320         m_band.show = false;
 321     }
 322 }
 323
 324 void DolphinDetailsView::startDrag(Qt::DropActions supportedActions)
 325 {
 326     DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 327     m_band.show = false;
 328 }
 329
 330 void DolphinDetailsView::dragEnterEvent(QDragEnterEvent* event)
 331 {
 332     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 333         event->acceptProposedAction();
 334     }
 335
 336     if (m_band.show) {
 337         updateElasticBand();
 338         m_band.show = false;
 339     }
 340 }
 341
 342 void DolphinDetailsView::dragLeaveEvent(QDragLeaveEvent* event)
 343 {
 344     QTreeView::dragLeaveEvent(event);
 345     setDirtyRegion(m_dropRect);
 346 }
 347
 348 void DolphinDetailsView::dragMoveEvent(QDragMoveEvent* event)
 349 {
 350     QTreeView::dragMoveEvent(event);
 351
 352     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 353     setDirtyRegion(m_dropRect);
 354     const QModelIndex index = indexAt(event->pos());
 355     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 356         const KFileItem item = m_controller->itemForIndex(index);
 357         if (!item.isNull() && item.isDir()) {
 358             m_dropRect = visualRect(index);
 359         } else {
 360             m_dropRect.setSize(QSize()); // set as invalid
 361         }
 362         setDirtyRegion(m_dropRect);
 363     }
 364
 365     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 366         // accept url drops, independently from the destination item
 367         event->acceptProposedAction();
 368     }
 369 }
 370
 371 void DolphinDetailsView::dropEvent(QDropEvent* event)
 372 {
 373     const QModelIndex index = indexAt(event->pos());
 374     KFileItem item;
 375     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 376         item = m_controller->itemForIndex(index);
 377     }
 378     m_controller->indicateDroppedUrls(item, m_controller->url(), event);
 379     QTreeView::dropEvent(event);
 380 }
 381
 382 void DolphinDetailsView::paintEvent(QPaintEvent* event)
 383 {
 384     QTreeView::paintEvent(event);
 385     if (m_band.show) {
 386         // The following code has been taken from QListView
 387         // and adapted to DolphinDetailsView.
 388         // (C) 1992-2007 Trolltech ASA
 389         QStyleOptionRubberBand opt;
 390         opt.initFrom(this);
 391         opt.shape = QRubberBand::Rectangle;
 392         opt.opaque = false;
 393         opt.rect = elasticBandRect();
 394
 395         QPainter painter(viewport());
 396         painter.save();
 397         style()->drawControl(QStyle::CE_RubberBand, &opt, &painter);
 398         painter.restore();
 399     }
 400 }
 401
 402 void DolphinDetailsView::keyPressEvent(QKeyEvent* event)
 403 {
 404     // If the Control modifier is pressed, a multiple selection
 405     // is done and DolphinDetailsView::currentChanged() may not
 406     // not change the selection in a custom way.
 407     m_keyPressed = !(event->modifiers() & Qt::ControlModifier);
 408
 409     QTreeView::keyPressEvent(event);
 410     m_controller->handleKeyPressEvent(event);
 411 }
 412
 413 void DolphinDetailsView::keyReleaseEvent(QKeyEvent* event)
 414 {
 415     QTreeView::keyReleaseEvent(event);
 416     m_keyPressed = false;
 417 }
 418
 419 void DolphinDetailsView::resizeEvent(QResizeEvent* event)
 420 {
 421     QTreeView::resizeEvent(event);
 422     if (m_autoResize) {
 423         resizeColumns();
 424     }
 425 }
 426
 427 void DolphinDetailsView::wheelEvent(QWheelEvent* event)
 428 {
 429     const int step = m_decorationSize.height();
 430     verticalScrollBar()->setSingleStep(step);
 431     QTreeView::wheelEvent(event);
 432 }
 433
 434 void DolphinDetailsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 435 {
 436     QTreeView::currentChanged(current, previous);
 437     m_extensionsFactory->handleCurrentIndexChange(current, previous);
 438
 439     // Stay consistent with QListView: When changing the current index by key presses,
 440     // also change the selection.
 441     if (m_keyPressed) {
 442         setCurrentIndex(current);
 443     }
 444 }
 445
 446 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 447 {
 448     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 449         // if the mouse is above an item and moved very fast outside the widget,
 450         // no viewportEntered() signal might be emitted although the mouse has been moved
 451         // above the viewport
 452         m_controller->emitViewportEntered();
 453     }
 454
 455     return QTreeView::eventFilter(watched, event);
 456 }
 457
 458 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 459 {
 460     // the blank portion of the name column counts as empty space
 461     const QModelIndex index = QTreeView::indexAt(point);
 462     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 463                                     (index.column() == KDirModel::Name) && !visualRect(index).contains(point);
 464     return isAboveEmptySpace ? QModelIndex() : index;
 465 }
 466
 467 QRect DolphinDetailsView::visualRect(const QModelIndex& index) const
 468 {
 469     QRect rect = QTreeView::visualRect(index);
 470     const KFileItem item = m_controller->itemForIndex(index);
 471     if (!item.isNull()) {
 472         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 473         rect.setWidth(width);
 474     }
 475
 476     return rect;
 477 }
 478
 479 void DolphinDetailsView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command)
 480 {
 481     // We must override setSelection() as Qt calls it internally and when this happens
 482     // we must ensure that the default indexAt() is used.
 483     if (!m_band.show) {
 484         m_useDefaultIndexAt = true;
 485         QTreeView::setSelection(rect, command);
 486         m_useDefaultIndexAt = false;
 487     } else {
 488         // Use our own elastic band selection algorithm
 489         updateElasticBandSelection();
 490     }
 491 }
 492
 493 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 494 {
 495     if (!m_ignoreScrollTo) {
 496         QTreeView::scrollTo(index, hint);
 497     }
 498 }
 499
 500 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 501 {
 502     header()->setSortIndicator(sorting, header()->sortIndicatorOrder());
 503 }
 504
 505 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 506 {
 507     header()->setSortIndicator(header()->sortIndicatorSection(), sortOrder);
 508 }
 509
 510 void DolphinDetailsView::synchronizeSortingState(int column)
 511 {
 512     // The sorting has already been changed in QTreeView if this slot is
 513     // invoked, but Dolphin is not informed about this.
 514     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 515     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 516     m_controller->indicateSortingChange(sorting);
 517     m_controller->indicateSortOrderChange(sortOrder);
 518 }
 519
 520 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 521 {
 522     if (index.column() == DolphinModel::Name) {
 523         m_controller->emitItemEntered(index);
 524     } else {
 525         m_controller->emitViewportEntered();
 526     }
 527 }
 528
 529 void DolphinDetailsView::updateElasticBand()
 530 {
 531     if (m_band.show) {
 532         QRect dirtyRegion(elasticBandRect());
 533         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 534         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 535         // Going above the (logical) top-left of the view causes complications during selection;
 536         // we may as well prevent it.
 537         if (m_band.destination.y() < 0) {
 538             m_band.destination.setY(0);
 539         }
 540         if (m_band.destination.x() < 0) {
 541             m_band.destination.setX(0);
 542         }
 543         dirtyRegion = dirtyRegion.united(elasticBandRect());
 544         setDirtyRegion(dirtyRegion);
 545     }
 546 }
 547
 548 QRect DolphinDetailsView::elasticBandRect() const
 549 {
 550     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 551
 552     const QPoint topLeft = m_band.origin - scrollPos;
 553     const QPoint bottomRight = m_band.destination - scrollPos;
 554     return QRect(topLeft, bottomRight).normalized();
 555 }
 556
 557 void DolphinDetailsView::setZoomLevel(int level)
 558 {
 559     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 560     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 561
 562     const bool showPreview = m_controller->dolphinView()->showPreview();
 563     if (showPreview) {
 564         settings->setPreviewSize(size);
 565     } else {
 566         settings->setIconSize(size);
 567     }
 568
 569     updateDecorationSize(showPreview);
 570 }
 571
 572 void DolphinDetailsView::slotShowPreviewChanged()
 573 {
 574     const DolphinView* view = m_controller->dolphinView();
 575     updateDecorationSize(view->showPreview());
 576 }
 577
 578 void DolphinDetailsView::configureSettings(const QPoint& pos)
 579 {
 580     KMenu popup(this);
 581     popup.addTitle(i18nc("@title:menu", "Columns"));
 582
 583     // add checkbox items for each column
 584     QHeaderView* headerView = header();
 585     const int columns = model()->columnCount();
 586     for (int i = 0; i < columns; ++i) {
 587         const int logicalIndex = headerView->logicalIndex(i);
 588         const QString text = model()->headerData(logicalIndex, Qt::Horizontal).toString();
 589         QAction* action = popup.addAction(text);
 590         action->setCheckable(true);
 591         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 592         action->setData(logicalIndex);
 593         action->setEnabled(logicalIndex != DolphinModel::Name);
 594     }
 595     popup.addSeparator();
 596
 597     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 598     if (activatedAction != 0) {
 599         const bool show = activatedAction->isChecked();
 600         const int columnIndex = activatedAction->data().toInt();
 601
 602         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 603         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 604         if (show) {
 605             Q_ASSERT(!list.contains(info));
 606             list.append(info);
 607         } else {
 608             Q_ASSERT(list.contains(info));
 609             const int index = list.indexOf(info);
 610             list.removeAt(index);
 611         }
 612
 613         m_controller->indicateAdditionalInfoChange(list);
 614         setColumnHidden(columnIndex, !show);
 615         resizeColumns();
 616     }
 617 }
 618
 619 void DolphinDetailsView::updateColumnVisibility()
 620 {
 621     QHeaderView* headerView = header();
 622     disconnect(headerView, SIGNAL(sectionMoved(int, int, int)),
 623                this, SLOT(saveColumnPositions()));
 624
 625     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 626     const QList<int> columnPositions = settings->columnPositions();
 627
 628     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 629     for (int i = DolphinModel::Name; i <= DolphinModel::Version; ++i) {
 630         const KFileItemDelegate::Information info = infoForColumn(i);
 631         const bool hide = !list.contains(info) && (i != DolphinModel::Name);
 632         if (isColumnHidden(i) != hide) {
 633             setColumnHidden(i, hide);
 634         }
 635
 636         const int from = headerView->visualIndex(i);
 637         headerView->moveSection(from, columnPositions[i]);
 638     }
 639
 640     resizeColumns();
 641
 642     connect(headerView, SIGNAL(sectionMoved(int, int, int)),
 643             this, SLOT(saveColumnPositions()));
 644
 645 }
 646
 647 void DolphinDetailsView::saveColumnPositions()
 648 {
 649     QList<int> columnPositions;
 650     for (int i = DolphinModel::Name; i <= DolphinModel::Version; ++i) {
 651         columnPositions.append(header()->visualIndex(i));
 652     }
 653
 654     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 655     settings->setColumnPositions(columnPositions);
 656 }
 657
 658 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 659 {
 660     Q_UNUSED(logicalIndex);
 661     Q_UNUSED(oldSize);
 662     Q_UNUSED(newSize);
 663     // If the user changes the size of the headers, the autoresize feature should be
 664     // turned off. As there is no dedicated interface to find out whether the header
 665     // section has been resized by the user or by a resize event, another approach is used.
 666     // Attention: Take care when changing the if-condition to verify that there is no
 667     // regression in combination with bug 178630 (see fix in comment #8).
 668     if ((QApplication::mouseButtons() & Qt::LeftButton) && header()->underMouse()) {
 669         disableAutoResizing();
 670     }
 671 }
 672
 673 void DolphinDetailsView::slotActivationChanged(bool active)
 674 {
 675     setAlternatingRowColors(active);
 676 }
 677
 678 void DolphinDetailsView::disableAutoResizing()
 679 {
 680     m_autoResize = false;
 681 }
 682
 683 void DolphinDetailsView::requestActivation()
 684 {
 685     m_controller->requestActivation();
 686 }
 687
 688 void DolphinDetailsView::slotGlobalSettingsChanged(int category)
 689 {
 690     Q_UNUSED(category);
 691
 692     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 693     Q_ASSERT(settings != 0);
 694     if (settings->useSystemFont()) {
 695         m_font = KGlobalSettings::generalFont();
 696     }
 697     //Disconnect then reconnect, since the settings have been changed, the connection requirements may have also.
 698     disconnect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 699     disconnect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 700     if (KGlobalSettings::singleClick()) {
 701         connect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 702     } else {
 703         connect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 704     }
 705 }
 706
 707 void DolphinDetailsView::updateElasticBandSelection()
 708 {
 709     if (!m_band.show) {
 710         return;
 711     }
 712
 713     // Ensure the elastic band itself is up-to-date, in
 714     // case we are being called due to e.g. a drag event.
 715     updateElasticBand();
 716
 717     // Clip horizontally to the name column, as some filenames will be
 718     // longer than the column.  We don't clip vertically as origin
 719     // may be above or below the current viewport area.
 720     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 721     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 722     QRect selRect = elasticBandRect().normalized();
 723     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 724     selRect = nameColumnArea.intersect(selRect).normalized();
 725     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 726     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 727     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 728
 729     if (selRect.isNull()) {
 730         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 731         m_band.ignoreOldInfo = true;
 732         return;
 733     }
 734
 735     if (!m_band.ignoreOldInfo) {
 736         // Do some quick checks to see if we can rule out the need to
 737         // update the selection.
 738         Q_ASSERT(uniformRowHeights());
 739         QModelIndex dummyIndex = model()->index(0, 0);
 740         if (!dummyIndex.isValid()) {
 741             // No items in the model presumably.
 742             return;
 743         }
 744
 745         // If the elastic band does not cover the same rows as before, we'll
 746         // need to re-check, and also invalidate the old item distances.
 747         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 748         const bool coveringSameRows =
 749             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 750             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 751         if (coveringSameRows) {
 752             // Covering the same rows, but have we moved far enough horizontally
 753             // that we might have (de)selected some other items?
 754             const bool itemSelectionChanged =
 755                 ((selRect.left() > oldSelRect.left()) &&
 756                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 757                 ((selRect.left() < oldSelRect.left()) &&
 758                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 759                 ((selRect.right() < oldSelRect.right()) &&
 760                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 761                 ((selRect.right() > oldSelRect.right()) &&
 762                  (selRect.right() >= m_band.outsideNearestRightEdge));
 763
 764             if (!itemSelectionChanged) {
 765                 return;
 766             }
 767         }
 768     }
 769     else {
 770         // This is the only piece of optimization data that needs to be explicitly
 771         // discarded.
 772         m_band.lastSelectionOrigin = QPoint();
 773         m_band.lastSelectionDestination = QPoint();
 774         oldSelRect = selRect;
 775     }
 776
 777     // Do the selection from scratch. Force a update of the horizontal distances info.
 778     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 779     m_band.insideNearestRightEdge  = nameColumnX - 1;
 780     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 781     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 782
 783     // Include the old selection rect as well, so we can deselect
 784     // items that were inside it but not in the new selRect.
 785     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 786     if (boundingRect.isNull()) {
 787         return;
 788     }
 789
 790     // Get the index of the item in this row in the name column.
 791     // TODO - would this still work if the columns could be re-ordered?
 792     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 793     if (startIndex.parent().isValid()) {
 794         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 795     } else {
 796         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 797     }
 798     if (!startIndex.isValid()) {
 799         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 800         m_band.ignoreOldInfo = true;
 801         return;
 802     }
 803
 804    // Go through all indexes between the top and bottom of boundingRect, and
 805    // update the selection.
 806    const int verticalCutoff = boundingRect.bottom();
 807    QModelIndex currIndex = startIndex;
 808    QModelIndex lastIndex;
 809    bool allItemsInBoundDone = false;
 810
 811    // Calling selectionModel()->select(...) for each item that needs to be
 812    // toggled is slow as each call emits selectionChanged(...) so store them
 813    // and do the selection toggle in one batch.
 814    QItemSelection itemsToToggle;
 815    // QItemSelection's deal with continuous ranges of indexes better than
 816    // single indexes, so try to portion items that need to be toggled into ranges.
 817    bool formingToggleIndexRange = false;
 818    QModelIndex toggleIndexRangeBegin = QModelIndex();
 819
 820    do {
 821        QRect currIndexRect = visualRect(currIndex);
 822
 823         // Update some optimization info as we go.
 824        const int cr = currIndexRect.right();
 825        const int cl = currIndexRect.left();
 826        const int sl = selRect.left();
 827        const int sr = selRect.right();
 828        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 829        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 830            m_band.outsideNearestLeftEdge = cr;
 831        }
 832        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 833            m_band.outsideNearestRightEdge = cl;
 834        }
 835        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 836            m_band.insideNearestRightEdge = cl;
 837        }
 838        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 839            m_band.insideNearestLeftEdge = cr;
 840        }
 841
 842        bool currentlySelected = selectionModel()->isSelected(currIndex);
 843        bool originallySelected = m_band.originalSelection.contains(currIndex);
 844        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 845        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 846        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 847        if (needToToggleItem && !formingToggleIndexRange) {
 848             toggleIndexRangeBegin = currIndex;
 849             formingToggleIndexRange = true;
 850        }
 851
 852        // NOTE: indexBelow actually walks up and down expanded trees for us.
 853        QModelIndex nextIndex = indexBelow(currIndex);
 854        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 855
 856        const bool commitToggleIndexRange = formingToggleIndexRange &&
 857                                            (!needToToggleItem ||
 858                                             allItemsInBoundDone ||
 859                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 860        if (commitToggleIndexRange) {
 861            formingToggleIndexRange = false;
 862             // If this is the last item in the bounds and it is also the beginning of a range,
 863             // don't toggle lastIndex - it will already have been dealt with.
 864            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 865                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 866            }
 867             // Need to start a new range immediately with currIndex?
 868            if (needToToggleItem) {
 869                toggleIndexRangeBegin = currIndex;
 870                formingToggleIndexRange = true;
 871            }
 872            if (allItemsInBoundDone && needToToggleItem) {
 873                 // Toggle the very last item in the bounds.
 874                itemsToToggle.select(currIndex, currIndex);
 875            }
 876        }
 877
 878        // next item
 879        lastIndex = currIndex;
 880        currIndex = nextIndex;
 881     } while (!allItemsInBoundDone);
 882
 883     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 884
 885     m_band.lastSelectionOrigin = m_band.origin;
 886     m_band.lastSelectionDestination = m_band.destination;
 887     m_band.ignoreOldInfo = false;
 888 }
 889
 890 void DolphinDetailsView::setFoldersExpandable(bool expandable)
 891 {
 892     if (!expandable) {
 893         // collapse all expanded folders, as QTreeView::setItemsExpandable(false)
 894         // does not do this task
 895         const int rowCount = model()->rowCount();
 896         for (int row = 0; row < rowCount; ++row) {
 897             setExpanded(model()->index(row, 0), false);
 898         }
 899     }
 900     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 901     settings->setExpandableFolders(expandable);
 902     setRootIsDecorated(expandable);
 903     setItemsExpandable(expandable);
 904 }
 905
 906 void DolphinDetailsView::slotExpanded(const QModelIndex& index)
 907 {
 908     KFileItem item = m_controller->itemForIndex(index);
 909     if (!item.isNull()) {
 910         m_expandedUrls.insert(item.url());
 911     }
 912 }
 913
 914 void DolphinDetailsView::slotCollapsed(const QModelIndex& index)
 915 {
 916     KFileItem item = m_controller->itemForIndex(index);
 917     if (!item.isNull()) {
 918         m_expandedUrls.remove(item.url());
 919     }
 920 }
 921
 922 void DolphinDetailsView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
 923 {
 924     removeExpandedIndexes(parent, start, end);
 925     QTreeView::rowsAboutToBeRemoved(parent, start, end);
 926 }
 927
 928 void DolphinDetailsView::removeExpandedIndexes(const QModelIndex& parent, int start, int end)
 929 {
 930     if (m_expandedUrls.isEmpty()) {
 931         return;
 932     }
 933
 934     for (int row = start; row <= end; row++) {
 935         const QModelIndex index = model()->index(row, 0, parent);
 936         if (isExpanded(index)) {
 937             slotCollapsed(index);
 938             removeExpandedIndexes(index, 0, model()->rowCount(index) - 1);
 939         }
 940     }
 941 }
 942
 943 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 944 {
 945     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 946     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 947     setIconSize(QSize(iconSize, iconSize));
 948     m_decorationSize = QSize(iconSize, iconSize);
 949
 950     doItemsLayout();
 951 }
 952
 953 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 954 {
 955     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 956
 957     switch (columnIndex) {
 958     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 959     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 960     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 961     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 962     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 963     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 964     default: break;
 965     }
 966
 967     return info;
 968 }
 969
 970 void DolphinDetailsView::resizeColumns()
 971 {
 972     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 973     // around 3 seconds for each (!) resize operation when having > 10000 items).
 974     // This gets a problem especially when opening large directories, where several
 975     // resize operations are received for showing the currently available items during
 976     // loading (the application hangs around 20 seconds when loading > 10000 items).
 977
 978     QHeaderView* headerView = header();
 979     QFontMetrics fontMetrics(viewport()->font());
 980
 981     int columnWidth[DolphinModel::Version + 1];
 982     columnWidth[DolphinModel::Size] = fontMetrics.width("00000 Items");
 983     columnWidth[DolphinModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 984     columnWidth[DolphinModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 985     columnWidth[DolphinModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 986     columnWidth[DolphinModel::Group] = fontMetrics.width("xxxxxxxxxx");
 987     columnWidth[DolphinModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
 988     columnWidth[DolphinModel::Version] = fontMetrics.width("xxxxxxxx");
 989
 990     int requiredWidth = 0;
 991     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
 992         if (!isColumnHidden(i)) {
 993             columnWidth[i] += 20; // provide a default gap
 994             requiredWidth += columnWidth[i];
 995             headerView->resizeSection(i, columnWidth[i]);
 996         }
 997     }
 998
 999     // resize the name column in a way that the whole available width is used
1000     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
1001
1002     const int minNameWidth = 300;
1003     if (columnWidth[KDirModel::Name] < minNameWidth) {
1004         columnWidth[KDirModel::Name] = minNameWidth;
1005
1006         // It might be possible that the name column width can be
1007         // decreased without clipping any text. For performance
1008         // reasons the exact necessary width for full visible names is
1009         // only checked for up to 200 items:
1010         const int rowCount = model()->rowCount();
1011         if (rowCount > 0 && rowCount < 200) {
1012             const int nameWidth = sizeHintForColumn(DolphinModel::Name);
1013             if (nameWidth + requiredWidth <= viewport()->width()) {
1014                 columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
1015             } else if (nameWidth < minNameWidth) {
1016                 columnWidth[KDirModel::Name] = nameWidth;
1017             }
1018         }
1019     }
1020
1021     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
1022 }
1023
1024 bool DolphinDetailsView::isAboveExpandingToggle(const QPoint& pos) const
1025 {
1026     // QTreeView offers no public API to get the information whether an index has an
1027     // expanding toggle and what boundaries the toggle has. The following approach
1028     // also assumes a toggle for file items.
1029     if (itemsExpandable()) {
1030         const QModelIndex index = QTreeView::indexAt(pos);
1031         if (index.isValid() && (index.column() == KDirModel::Name)) {
1032             QRect rect = visualRect(index);
1033             const int toggleSize = rect.height();
1034             if (isRightToLeft()) {
1035                 rect.moveRight(rect.right());
1036             } else {
1037                 rect.moveLeft(rect.x() - toggleSize);
1038             }
1039             rect.setWidth(toggleSize);
1040
1041             QStyleOption opt;
1042             opt.initFrom(this);
1043             opt.rect = rect;
1044             rect = style()->subElementRect(QStyle::SE_TreeViewDisclosureItem, &opt, this);
1045
1046             return rect.contains(pos);
1047         }
1048     }
1049     return false;
1050 }
1051
1052 DolphinDetailsView::ElasticBand::ElasticBand() :
1053     show(false),
1054     origin(),
1055     destination(),
1056     lastSelectionOrigin(),
1057     lastSelectionDestination(),
1058     ignoreOldInfo(true),
1059     outsideNearestLeftEdge(0),
1060     outsideNearestRightEdge(0),
1061     insideNearestLeftEdge(0),
1062     insideNearestRightEdge(0)
1063 {
1064 }
1065
1066 #include "dolphindetailsview.moc"