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