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 "selectionmanager.h"
  31 #include "viewextensionsfactory.h"
  32 #include "viewproperties.h"
  33 #include "zoomlevelinfo.h"
  34
  35 #include "dolphin_detailsmodesettings.h"
  36 #include "dolphin_generalsettings.h"
  37
  38 #include <kdirmodel.h>
  39 #include <klocale.h>
  40 #include <kmenu.h>
  41
  42 #include <QAction>
  43 #include <QApplication>
  44 #include <QHeaderView>
  45 #include <QRubberBand>
  46 #include <QPainter>
  47 #include <QScrollBar>
  48
  49 DolphinDetailsView::DolphinDetailsView(QWidget* parent,
  50                                        DolphinController* controller,
  51                                        DolphinSortFilterProxyModel* proxyModel) :
  52     QTreeView(parent),
  53     m_autoResize(true),
  54     m_expandingTogglePressed(false),
  55     m_keyPressed(false),
  56     m_useDefaultIndexAt(true),
  57     m_ignoreScrollTo(false),
  58     m_controller(controller),
  59     m_selectionManager(0),
  60     m_autoScroller(0),
  61     m_expandableFoldersAction(0),
  62     m_font(),
  63     m_decorationSize(),
  64     m_band()
  65 {
  66     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
  67     Q_ASSERT(settings != 0);
  68     Q_ASSERT(controller != 0);
  69
  70     setLayoutDirection(Qt::LeftToRight);
  71     setAcceptDrops(true);
  72     setSortingEnabled(true);
  73     setUniformRowHeights(true);
  74     setSelectionBehavior(SelectItems);
  75     setDragDropMode(QAbstractItemView::DragDrop);
  76     setDropIndicatorShown(false);
  77     setAlternatingRowColors(true);
  78     setRootIsDecorated(settings->expandableFolders());
  79     setItemsExpandable(settings->expandableFolders());
  80     setEditTriggers(QAbstractItemView::NoEditTriggers);
  81     setModel(proxyModel);
  82
  83     setMouseTracking(true);
  84     m_autoScroller = new DolphinViewAutoScroller(this);
  85
  86     const ViewProperties props(controller->url());
  87     setSortIndicatorSection(props.sorting());
  88     setSortIndicatorOrder(props.sortOrder());
  89
  90     QHeaderView* headerView = header();
  91     connect(headerView, SIGNAL(sectionClicked(int)),
  92             this, SLOT(synchronizeSortingState(int)));
  93     headerView->setContextMenuPolicy(Qt::CustomContextMenu);
  94     connect(headerView, SIGNAL(customContextMenuRequested(const QPoint&)),
  95             this, SLOT(configureSettings(const QPoint&)));
  96     connect(headerView, SIGNAL(sectionResized(int, int, int)),
  97             this, SLOT(slotHeaderSectionResized(int, int, int)));
  98     connect(headerView, SIGNAL(sectionHandleDoubleClicked(int)),
  99             this, SLOT(disableAutoResizing()));
 100
 101     connect(parent, SIGNAL(sortingChanged(DolphinView::Sorting)),
 102             this, SLOT(setSortIndicatorSection(DolphinView::Sorting)));
 103     connect(parent, SIGNAL(sortOrderChanged(Qt::SortOrder)),
 104             this, SLOT(setSortIndicatorOrder(Qt::SortOrder)));
 105
 106     connect(this, SIGNAL(clicked(const QModelIndex&)),
 107             controller, SLOT(requestTab(const QModelIndex&)));
 108     if (KGlobalSettings::singleClick()) {
 109         connect(this, SIGNAL(clicked(const QModelIndex&)),
 110                 controller, SLOT(triggerItem(const QModelIndex&)));
 111     } else {
 112         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 113                 controller, SLOT(triggerItem(const QModelIndex&)));
 114     }
 115
 116     if (DolphinSettings::instance().generalSettings()->showSelectionToggle()) {
 117         m_selectionManager = new SelectionManager(this);
 118         connect(m_selectionManager, SIGNAL(selectionChanged()),
 119                 this, SLOT(requestActivation()));
 120         connect(m_controller, SIGNAL(urlChanged(const KUrl&)),
 121                 m_selectionManager, SLOT(reset()));
 122     }
 123
 124     connect(this, SIGNAL(entered(const QModelIndex&)),
 125             this, SLOT(slotEntered(const QModelIndex&)));
 126     connect(this, SIGNAL(viewportEntered()),
 127             controller, SLOT(emitViewportEntered()));
 128     connect(controller, SIGNAL(nameFilterChanged(const QString&)),
 129             this, SLOT(setNameFilter(const QString&)));
 130     connect(controller, SIGNAL(zoomLevelChanged(int)),
 131             this, SLOT(setZoomLevel(int)));
 132     connect(controller->dolphinView(), SIGNAL(additionalInfoChanged()),
 133             this, SLOT(updateColumnVisibility()));
 134     connect(controller, SIGNAL(activationChanged(bool)),
 135             this, SLOT(slotActivationChanged(bool)));
 136
 137     if (settings->useSystemFont()) {
 138         m_font = KGlobalSettings::generalFont();
 139     } else {
 140         m_font = QFont(settings->fontFamily(),
 141                        settings->fontSize(),
 142                        settings->fontWeight(),
 143                        settings->italicFont());
 144     }
 145
 146     setVerticalScrollMode(QTreeView::ScrollPerPixel);
 147     setHorizontalScrollMode(QTreeView::ScrollPerPixel);
 148
 149     const DolphinView* view = controller->dolphinView();
 150     connect(view, SIGNAL(showPreviewChanged()),
 151             this, SLOT(slotShowPreviewChanged()));
 152
 153     updateDecorationSize(view->showPreview());
 154
 155     setFocus();
 156     viewport()->installEventFilter(this);
 157
 158     connect(KGlobalSettings::self(), SIGNAL(settingsChanged(int)),
 159             this, SLOT(slotGlobalSettingsChanged(int)));
 160
 161     m_useDefaultIndexAt = false;
 162
 163     m_expandableFoldersAction = new QAction(i18nc("@option:check", "Expandable Folders"), this);
 164     m_expandableFoldersAction->setCheckable(true);
 165     connect(m_expandableFoldersAction, SIGNAL(toggled(bool)),
 166             this, SLOT(setFoldersExpandable(bool)));
 167
 168     new ViewExtensionsFactory(this, controller);
 169 }
 170
 171 DolphinDetailsView::~DolphinDetailsView()
 172 {
 173 }
 174
 175 bool DolphinDetailsView::event(QEvent* event)
 176 {
 177     if (event->type() == QEvent::Polish) {
 178         header()->setResizeMode(QHeaderView::Interactive);
 179         updateColumnVisibility();
 180     }
 181
 182     return QTreeView::event(event);
 183 }
 184
 185 QStyleOptionViewItem DolphinDetailsView::viewOptions() const
 186 {
 187     QStyleOptionViewItem viewOptions = QTreeView::viewOptions();
 188     viewOptions.font = m_font;
 189     viewOptions.showDecorationSelected = true;
 190     viewOptions.decorationSize = m_decorationSize;
 191     return viewOptions;
 192 }
 193
 194 void DolphinDetailsView::contextMenuEvent(QContextMenuEvent* event)
 195 {
 196     QTreeView::contextMenuEvent(event);
 197
 198     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 199     m_expandableFoldersAction->setChecked(settings->expandableFolders());
 200     m_controller->triggerContextMenuRequest(event->pos(),
 201                                             QList<QAction*>() << m_expandableFoldersAction);
 202 }
 203
 204 void DolphinDetailsView::mousePressEvent(QMouseEvent* event)
 205 {
 206     m_controller->requestActivation();
 207
 208     const QModelIndex current = currentIndex();
 209     QTreeView::mousePressEvent(event);
 210
 211     m_expandingTogglePressed = isAboveExpandingToggle(event->pos());
 212
 213     const QModelIndex index = indexAt(event->pos());
 214     const bool updateState = index.isValid() &&
 215                              (index.column() == DolphinModel::Name) &&
 216                              (event->button() == Qt::LeftButton);
 217     if (updateState) {
 218         setState(QAbstractItemView::DraggingState);
 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 mod = QApplication::keyboardModifiers();
 228         if (!m_expandingTogglePressed && !(mod & Qt::ShiftModifier) && !(mod & 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 scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 245             m_band.origin = event->pos()  + scrollPos;
 246             m_band.destination = m_band.origin;
 247             m_band.originalSelection = selectionModel()->selection();
 248         }
 249     }
 250 }
 251
 252 void DolphinDetailsView::mouseMoveEvent(QMouseEvent* event)
 253 {
 254     if (m_expandingTogglePressed) {
 255         // Per default QTreeView starts either a selection or a drag operation when dragging
 256         // the expanding toggle button (Qt-issue - see TODO comment in DolphinIconsView::mousePressEvent()).
 257         // Turn off this behavior in Dolphin to stay predictable:
 258         setState(QAbstractItemView::NoState);
 259         return;
 260     }
 261
 262     if (m_band.show) {
 263         const QPoint mousePos = event->pos();
 264         const QModelIndex index = indexAt(mousePos);
 265         if (!index.isValid()) {
 266             // the destination of the selection rectangle is above the viewport. In this
 267             // case QTreeView does no selection at all, which is not the wanted behavior
 268             // in Dolphin -> select all items within the elastic band rectangle
 269             updateElasticBandSelection();
 270         }
 271
 272         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 273         // as the Qt-issue #199631 has been fixed.
 274         // QTreeView::mouseMoveEvent(event);
 275         QAbstractItemView::mouseMoveEvent(event);
 276         updateElasticBand();
 277     } else {
 278         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 279         // as the Qt-issue #199631 has been fixed.
 280         // QTreeView::mouseMoveEvent(event);
 281         QAbstractItemView::mouseMoveEvent(event);
 282     }
 283 }
 284
 285 void DolphinDetailsView::mouseReleaseEvent(QMouseEvent* event)
 286 {
 287     if (!m_expandingTogglePressed) {
 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
 302     if (m_band.show) {
 303         setState(NoState);
 304         updateElasticBand();
 305         m_band.show = false;
 306     }
 307 }
 308
 309 void DolphinDetailsView::startDrag(Qt::DropActions supportedActions)
 310 {
 311     DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 312     m_band.show = false;
 313 }
 314
 315 void DolphinDetailsView::dragEnterEvent(QDragEnterEvent* event)
 316 {
 317     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 318         event->acceptProposedAction();
 319     }
 320
 321     if (m_band.show) {
 322         updateElasticBand();
 323         m_band.show = false;
 324     }
 325 }
 326
 327 void DolphinDetailsView::dragLeaveEvent(QDragLeaveEvent* event)
 328 {
 329     QTreeView::dragLeaveEvent(event);
 330     setDirtyRegion(m_dropRect);
 331 }
 332
 333 void DolphinDetailsView::dragMoveEvent(QDragMoveEvent* event)
 334 {
 335     QTreeView::dragMoveEvent(event);
 336
 337     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 338     setDirtyRegion(m_dropRect);
 339     const QModelIndex index = indexAt(event->pos());
 340     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 341         const KFileItem item = m_controller->itemForIndex(index);
 342         if (!item.isNull() && item.isDir()) {
 343             m_dropRect = visualRect(index);
 344         } else {
 345             m_dropRect.setSize(QSize()); // set as invalid
 346         }
 347         setDirtyRegion(m_dropRect);
 348     }
 349
 350     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 351         // accept url drops, independently from the destination item
 352         event->acceptProposedAction();
 353     }
 354 }
 355
 356 void DolphinDetailsView::dropEvent(QDropEvent* event)
 357 {
 358     const QModelIndex index = indexAt(event->pos());
 359     KFileItem item;
 360     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 361         item = m_controller->itemForIndex(index);
 362     }
 363     m_controller->indicateDroppedUrls(item, m_controller->url(), event);
 364     QTreeView::dropEvent(event);
 365 }
 366
 367 void DolphinDetailsView::paintEvent(QPaintEvent* event)
 368 {
 369     QTreeView::paintEvent(event);
 370     if (m_band.show) {
 371         // The following code has been taken from QListView
 372         // and adapted to DolphinDetailsView.
 373         // (C) 1992-2007 Trolltech ASA
 374         QStyleOptionRubberBand opt;
 375         opt.initFrom(this);
 376         opt.shape = QRubberBand::Rectangle;
 377         opt.opaque = false;
 378         opt.rect = elasticBandRect();
 379
 380         QPainter painter(viewport());
 381         painter.save();
 382         style()->drawControl(QStyle::CE_RubberBand, &opt, &painter);
 383         painter.restore();
 384     }
 385 }
 386
 387 void DolphinDetailsView::keyPressEvent(QKeyEvent* event)
 388 {
 389     // If the Control modifier is pressed, a multiple selection
 390     // is done and DolphinDetailsView::currentChanged() may not
 391     // not change the selection in a custom way.
 392     m_keyPressed = !(event->modifiers() & Qt::ControlModifier);
 393
 394     QTreeView::keyPressEvent(event);
 395     m_controller->handleKeyPressEvent(event);
 396 }
 397
 398 void DolphinDetailsView::keyReleaseEvent(QKeyEvent* event)
 399 {
 400     QTreeView::keyReleaseEvent(event);
 401     m_keyPressed = false;
 402 }
 403
 404 void DolphinDetailsView::resizeEvent(QResizeEvent* event)
 405 {
 406     QTreeView::resizeEvent(event);
 407     if (m_autoResize) {
 408         resizeColumns();
 409     }
 410 }
 411
 412 void DolphinDetailsView::wheelEvent(QWheelEvent* event)
 413 {
 414     if (m_selectionManager != 0) {
 415         m_selectionManager->reset();
 416     }
 417
 418     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 419     if (event->modifiers() & Qt::ControlModifier) {
 420         event->ignore();
 421         return;
 422     }
 423
 424     const int height = m_decorationSize.height();
 425     const int step = (height >= KIconLoader::SizeHuge) ? height / 10 : (KIconLoader::SizeHuge - height) / 2;
 426     verticalScrollBar()->setSingleStep(step);
 427     QTreeView::wheelEvent(event);
 428 }
 429
 430 void DolphinDetailsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 431 {
 432     QTreeView::currentChanged(current, previous);
 433     m_autoScroller->handleCurrentIndexChange(current, previous);
 434
 435     // Stay consistent with QListView: When changing the current index by key presses,
 436     // also change the selection.
 437     if (m_keyPressed) {
 438         selectionModel()->select(current, QItemSelectionModel::ClearAndSelect);
 439     }
 440 }
 441
 442 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 443 {
 444     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 445         // if the mouse is above an item and moved very fast outside the widget,
 446         // no viewportEntered() signal might be emitted although the mouse has been moved
 447         // above the viewport
 448         m_controller->emitViewportEntered();
 449     }
 450
 451     return QTreeView::eventFilter(watched, event);
 452 }
 453
 454 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 455 {
 456     // the blank portion of the name column counts as empty space
 457     const QModelIndex index = QTreeView::indexAt(point);
 458     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 459                                     (index.column() == KDirModel::Name) && !nameColumnRect(index).contains(point);
 460     return isAboveEmptySpace ? QModelIndex() : index;
 461 }
 462
 463 void DolphinDetailsView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command)
 464 {
 465     // We must override setSelection() as Qt calls it internally and when this happens
 466     // we must ensure that the default indexAt() is used.
 467     if (!m_band.show) {
 468         m_useDefaultIndexAt = true;
 469         QTreeView::setSelection(rect, command);
 470         m_useDefaultIndexAt = false;
 471     } else {
 472         // Use our own elastic band selection algorithm
 473         updateElasticBandSelection();
 474     }
 475 }
 476
 477 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 478 {
 479     if (!m_ignoreScrollTo) {
 480         QTreeView::scrollTo(index, hint);
 481     }
 482 }
 483
 484 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 485 {
 486     header()->setSortIndicator(sorting, header()->sortIndicatorOrder());
 487 }
 488
 489 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 490 {
 491     header()->setSortIndicator(header()->sortIndicatorSection(), sortOrder);
 492 }
 493
 494 void DolphinDetailsView::synchronizeSortingState(int column)
 495 {
 496     // The sorting has already been changed in QTreeView if this slot is
 497     // invoked, but Dolphin is not informed about this.
 498     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 499     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 500     m_controller->indicateSortingChange(sorting);
 501     m_controller->indicateSortOrderChange(sortOrder);
 502 }
 503
 504 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 505 {
 506     if (index.column() == DolphinModel::Name) {
 507         m_controller->emitItemEntered(index);
 508     } else {
 509         m_controller->emitViewportEntered();
 510     }
 511 }
 512
 513 void DolphinDetailsView::updateElasticBand()
 514 {
 515     if (m_band.show) {
 516         QRect dirtyRegion(elasticBandRect());
 517         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 518         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 519         // Going above the (logical) top-left of the view causes complications during selection;
 520         // we may as well prevent it.
 521         if (m_band.destination.y() < 0) {
 522             m_band.destination.setY(0);
 523         }
 524         if (m_band.destination.x() < 0) {
 525             m_band.destination.setX(0);
 526         }
 527         dirtyRegion = dirtyRegion.united(elasticBandRect());
 528         setDirtyRegion(dirtyRegion);
 529     }
 530 }
 531
 532 QRect DolphinDetailsView::elasticBandRect() const
 533 {
 534     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 535
 536     const QPoint topLeft = m_band.origin - scrollPos;
 537     const QPoint bottomRight = m_band.destination - scrollPos;
 538     return QRect(topLeft, bottomRight).normalized();
 539 }
 540
 541 void DolphinDetailsView::setNameFilter(const QString& nameFilter)
 542 {
 543     DolphinSortFilterProxyModel* proxyModel = static_cast<DolphinSortFilterProxyModel*>(model());
 544     proxyModel->setFilterRegExp(nameFilter);
 545 }
 546
 547 void DolphinDetailsView::setZoomLevel(int level)
 548 {
 549     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 550     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 551
 552     const bool showPreview = m_controller->dolphinView()->showPreview();
 553     if (showPreview) {
 554         settings->setPreviewSize(size);
 555     } else {
 556         settings->setIconSize(size);
 557     }
 558
 559     updateDecorationSize(showPreview);
 560 }
 561
 562 void DolphinDetailsView::slotShowPreviewChanged()
 563 {
 564     const DolphinView* view = m_controller->dolphinView();
 565     updateDecorationSize(view->showPreview());
 566 }
 567
 568 void DolphinDetailsView::configureSettings(const QPoint& pos)
 569 {
 570     KMenu popup(this);
 571     popup.addTitle(i18nc("@title:menu", "Columns"));
 572
 573     // add checkbox items for each column
 574     QHeaderView* headerView = header();
 575     const int columns = model()->columnCount();
 576     for (int i = 0; i < columns; ++i) {
 577         const int logicalIndex = headerView->logicalIndex(i);
 578         const QString text = model()->headerData(logicalIndex, Qt::Horizontal).toString();
 579         QAction* action = popup.addAction(text);
 580         action->setCheckable(true);
 581         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 582         action->setData(logicalIndex);
 583         action->setEnabled(logicalIndex != DolphinModel::Name);
 584     }
 585     popup.addSeparator();
 586
 587     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 588     if (activatedAction != 0) {
 589         const bool show = activatedAction->isChecked();
 590         const int columnIndex = activatedAction->data().toInt();
 591
 592         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 593         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 594         if (show) {
 595             Q_ASSERT(!list.contains(info));
 596             list.append(info);
 597         } else {
 598             Q_ASSERT(list.contains(info));
 599             const int index = list.indexOf(info);
 600             list.removeAt(index);
 601         }
 602
 603         m_controller->indicateAdditionalInfoChange(list);
 604         setColumnHidden(columnIndex, !show);
 605         resizeColumns();
 606     }
 607 }
 608
 609 void DolphinDetailsView::updateColumnVisibility()
 610 {
 611     QHeaderView* headerView = header();
 612     disconnect(headerView, SIGNAL(sectionMoved(int, int, int)),
 613                this, SLOT(saveColumnPositions()));
 614
 615     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 616     const QList<int> columnPositions = settings->columnPositions();
 617
 618     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 619     for (int i = DolphinModel::Name; i <= DolphinModel::Version; ++i) {
 620         const KFileItemDelegate::Information info = infoForColumn(i);
 621         const bool hide = !list.contains(info) && (i != DolphinModel::Name);
 622         if (isColumnHidden(i) != hide) {
 623             setColumnHidden(i, hide);
 624         }
 625
 626         const int from = headerView->visualIndex(i);
 627         headerView->moveSection(from, columnPositions[i]);
 628     }
 629
 630     resizeColumns();
 631
 632     connect(headerView, SIGNAL(sectionMoved(int, int, int)),
 633             this, SLOT(saveColumnPositions()));
 634
 635 }
 636
 637 void DolphinDetailsView::saveColumnPositions()
 638 {
 639     QList<int> columnPositions;
 640     for (int i = DolphinModel::Name; i <= DolphinModel::Version; ++i) {
 641         columnPositions.append(header()->visualIndex(i));
 642     }
 643
 644     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 645     settings->setColumnPositions(columnPositions);
 646 }
 647
 648 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 649 {
 650     Q_UNUSED(logicalIndex);
 651     Q_UNUSED(oldSize);
 652     Q_UNUSED(newSize);
 653     // If the user changes the size of the headers, the autoresize feature should be
 654     // turned off. As there is no dedicated interface to find out whether the header
 655     // section has been resized by the user or by a resize event, another approach is used.
 656     // Attention: Take care when changing the if-condition to verify that there is no
 657     // regression in combination with bug 178630 (see fix in comment #8).
 658     if ((QApplication::mouseButtons() & Qt::LeftButton) && header()->underMouse()) {
 659         disableAutoResizing();
 660     }
 661 }
 662
 663 void DolphinDetailsView::slotActivationChanged(bool active)
 664 {
 665     setAlternatingRowColors(active);
 666 }
 667
 668 void DolphinDetailsView::disableAutoResizing()
 669 {
 670     m_autoResize = false;
 671 }
 672
 673 void DolphinDetailsView::requestActivation()
 674 {
 675     m_controller->requestActivation();
 676 }
 677
 678 void DolphinDetailsView::slotGlobalSettingsChanged(int category)
 679 {
 680     Q_UNUSED(category);
 681
 682     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 683     Q_ASSERT(settings != 0);
 684     if (settings->useSystemFont()) {
 685         m_font = KGlobalSettings::generalFont();
 686     }
 687     //Disconnect then reconnect, since the settings have been changed, the connection requirements may have also.
 688     disconnect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 689     disconnect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 690     if (KGlobalSettings::singleClick()) {
 691         connect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 692     } else {
 693         connect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 694     }
 695 }
 696
 697 void DolphinDetailsView::updateElasticBandSelection()
 698 {
 699     if (!m_band.show) {
 700         return;
 701     }
 702
 703     // Ensure the elastic band itself is up-to-date, in
 704     // case we are being called due to e.g. a drag event.
 705     updateElasticBand();
 706
 707     // Clip horizontally to the name column, as some filenames will be
 708     // longer than the column.  We don't clip vertically as origin
 709     // may be above or below the current viewport area.
 710     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 711     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 712     QRect selRect = elasticBandRect().normalized();
 713     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 714     selRect = nameColumnArea.intersect(selRect).normalized();
 715     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 716     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 717     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 718
 719     if (selRect.isNull()) {
 720         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 721         m_band.ignoreOldInfo = true;
 722         return;
 723     }
 724
 725     if (!m_band.ignoreOldInfo) {
 726         // Do some quick checks to see if we can rule out the need to
 727         // update the selection.
 728         Q_ASSERT(uniformRowHeights());
 729         QModelIndex dummyIndex = model()->index(0, 0);
 730         if (!dummyIndex.isValid()) {
 731             // No items in the model presumably.
 732             return;
 733         }
 734
 735         // If the elastic band does not cover the same rows as before, we'll
 736         // need to re-check, and also invalidate the old item distances.
 737         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 738         const bool coveringSameRows =
 739             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 740             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 741         if (coveringSameRows) {
 742             // Covering the same rows, but have we moved far enough horizontally
 743             // that we might have (de)selected some other items?
 744             const bool itemSelectionChanged =
 745                 ((selRect.left() > oldSelRect.left()) &&
 746                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 747                 ((selRect.left() < oldSelRect.left()) &&
 748                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 749                 ((selRect.right() < oldSelRect.right()) &&
 750                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 751                 ((selRect.right() > oldSelRect.right()) &&
 752                  (selRect.right() >= m_band.outsideNearestRightEdge));
 753
 754             if (!itemSelectionChanged) {
 755                 return;
 756             }
 757         }
 758     }
 759     else {
 760         // This is the only piece of optimization data that needs to be explicitly
 761         // discarded.
 762         m_band.lastSelectionOrigin = QPoint();
 763         m_band.lastSelectionDestination = QPoint();
 764         oldSelRect = selRect;
 765     }
 766
 767     // Do the selection from scratch. Force a update of the horizontal distances info.
 768     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 769     m_band.insideNearestRightEdge  = nameColumnX - 1;
 770     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 771     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 772
 773     // Include the old selection rect as well, so we can deselect
 774     // items that were inside it but not in the new selRect.
 775     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 776     if (boundingRect.isNull()) {
 777         return;
 778     }
 779
 780     // Get the index of the item in this row in the name column.
 781     // TODO - would this still work if the columns could be re-ordered?
 782     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 783     if (startIndex.parent().isValid()) {
 784         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 785     } else {
 786         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 787     }
 788     if (!startIndex.isValid()) {
 789         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 790         m_band.ignoreOldInfo = true;
 791         return;
 792     }
 793
 794    // Go through all indexes between the top and bottom of boundingRect, and
 795    // update the selection.
 796    const int verticalCutoff = boundingRect.bottom();
 797    QModelIndex currIndex = startIndex;
 798    QModelIndex lastIndex;
 799    bool allItemsInBoundDone = false;
 800
 801    // Calling selectionModel()->select(...) for each item that needs to be
 802    // toggled is slow as each call emits selectionChanged(...) so store them
 803    // and do the selection toggle in one batch.
 804    QItemSelection itemsToToggle;
 805    // QItemSelection's deal with continuous ranges of indexes better than
 806    // single indexes, so try to portion items that need to be toggled into ranges.
 807    bool formingToggleIndexRange = false;
 808    QModelIndex toggleIndexRangeBegin = QModelIndex();
 809
 810    do {
 811        QRect currIndexRect = nameColumnRect(currIndex);
 812
 813         // Update some optimization info as we go.
 814        const int cr = currIndexRect.right();
 815        const int cl = currIndexRect.left();
 816        const int sl = selRect.left();
 817        const int sr = selRect.right();
 818        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 819        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 820            m_band.outsideNearestLeftEdge = cr;
 821        }
 822        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 823            m_band.outsideNearestRightEdge = cl;
 824        }
 825        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 826            m_band.insideNearestRightEdge = cl;
 827        }
 828        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 829            m_band.insideNearestLeftEdge = cr;
 830        }
 831
 832        bool currentlySelected = selectionModel()->isSelected(currIndex);
 833        bool originallySelected = m_band.originalSelection.contains(currIndex);
 834        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 835        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 836        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 837        if (needToToggleItem && !formingToggleIndexRange) {
 838             toggleIndexRangeBegin = currIndex;
 839             formingToggleIndexRange = true;
 840        }
 841
 842        // NOTE: indexBelow actually walks up and down expanded trees for us.
 843        QModelIndex nextIndex = indexBelow(currIndex);
 844        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 845
 846        const bool commitToggleIndexRange = formingToggleIndexRange &&
 847                                            (!needToToggleItem ||
 848                                             allItemsInBoundDone ||
 849                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 850        if (commitToggleIndexRange) {
 851            formingToggleIndexRange = false;
 852             // If this is the last item in the bounds and it is also the beginning of a range,
 853             // don't toggle lastIndex - it will already have been dealt with.
 854            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 855                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 856            }
 857             // Need to start a new range immediately with currIndex?
 858            if (needToToggleItem) {
 859                toggleIndexRangeBegin = currIndex;
 860                formingToggleIndexRange = true;
 861            }
 862            if (allItemsInBoundDone && needToToggleItem) {
 863                 // Toggle the very last item in the bounds.
 864                itemsToToggle.select(currIndex, currIndex);
 865            }
 866        }
 867
 868        // next item
 869        lastIndex = currIndex;
 870        currIndex = nextIndex;
 871     } while (!allItemsInBoundDone);
 872
 873     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 874
 875     m_band.lastSelectionOrigin = m_band.origin;
 876     m_band.lastSelectionDestination = m_band.destination;
 877     m_band.ignoreOldInfo = false;
 878 }
 879
 880 void DolphinDetailsView::setFoldersExpandable(bool expandable)
 881 {
 882     if (!expandable) {
 883         // collapse all expanded folders, as QTreeView::setItemsExpandable(false)
 884         // does not do this task
 885         const int rowCount = model()->rowCount();
 886         for (int row = 0; row < rowCount; ++row) {
 887             setExpanded(model()->index(row, 0), false);
 888         }
 889     }
 890     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 891     settings->setExpandableFolders(expandable);
 892     setRootIsDecorated(expandable);
 893     setItemsExpandable(expandable);
 894 }
 895
 896 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 897 {
 898     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 899     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 900     setIconSize(QSize(iconSize, iconSize));
 901     m_decorationSize = QSize(iconSize, iconSize);
 902
 903     if (m_selectionManager != 0) {
 904         m_selectionManager->reset();
 905     }
 906
 907     doItemsLayout();
 908 }
 909
 910 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 911 {
 912     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 913
 914     switch (columnIndex) {
 915     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 916     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 917     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 918     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 919     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 920     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 921     default: break;
 922     }
 923
 924     return info;
 925 }
 926
 927 void DolphinDetailsView::resizeColumns()
 928 {
 929     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 930     // around 3 seconds for each (!) resize operation when having > 10000 items).
 931     // This gets a problem especially when opening large directories, where several
 932     // resize operations are received for showing the currently available items during
 933     // loading (the application hangs around 20 seconds when loading > 10000 items).
 934
 935     QHeaderView* headerView = header();
 936     QFontMetrics fontMetrics(viewport()->font());
 937
 938     int columnWidth[DolphinModel::Version + 1];
 939     columnWidth[DolphinModel::Size] = fontMetrics.width("00000 Items");
 940     columnWidth[DolphinModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 941     columnWidth[DolphinModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 942     columnWidth[DolphinModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 943     columnWidth[DolphinModel::Group] = fontMetrics.width("xxxxxxxxxx");
 944     columnWidth[DolphinModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
 945     columnWidth[DolphinModel::Version] = fontMetrics.width("xxxxxxxx");
 946
 947     int requiredWidth = 0;
 948     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
 949         if (!isColumnHidden(i)) {
 950             columnWidth[i] += 20; // provide a default gap
 951             requiredWidth += columnWidth[i];
 952             headerView->resizeSection(i, columnWidth[i]);
 953         }
 954     }
 955
 956     // resize the name column in a way that the whole available width is used
 957     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 958
 959     const int minNameWidth = 300;
 960     if (columnWidth[KDirModel::Name] < minNameWidth) {
 961         columnWidth[KDirModel::Name] = minNameWidth;
 962
 963         // It might be possible that the name column width can be
 964         // decreased without clipping any text. For performance
 965         // reasons the exact necessary width for full visible names is
 966         // only checked for up to 200 items:
 967         const int rowCount = model()->rowCount();
 968         if (rowCount > 0 && rowCount < 200) {
 969             const int nameWidth = sizeHintForColumn(DolphinModel::Name);
 970             if (nameWidth + requiredWidth <= viewport()->width()) {
 971                 columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 972             } else if (nameWidth < minNameWidth) {
 973                 columnWidth[KDirModel::Name] = nameWidth;
 974             }
 975         }
 976     }
 977
 978     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
 979 }
 980
 981 QRect DolphinDetailsView::nameColumnRect(const QModelIndex& index) const
 982 {
 983     QRect rect = visualRect(index);
 984     const KFileItem item = m_controller->itemForIndex(index);
 985     if (!item.isNull()) {
 986         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 987         rect.setWidth(width);
 988     }
 989
 990     return rect;
 991 }
 992
 993 bool DolphinDetailsView::isAboveExpandingToggle(const QPoint& pos) const
 994 {
 995     // QTreeView offers no public API to get the information whether an index has an
 996     // expanding toggle and what boundaries the toggle has. The following approach
 997     // also assumes a toggle for file items.
 998     if (itemsExpandable()) {
 999         const QModelIndex index = QTreeView::indexAt(pos);
1000         if (index.isValid() && (index.column() == KDirModel::Name)) {
1001             QRect rect = nameColumnRect(index);
1002             const int toggleSize = rect.height();
1003             if (isRightToLeft()) {
1004                 rect.moveRight(rect.right());
1005             } else {
1006                 rect.moveLeft(rect.x() - toggleSize);
1007             }
1008             rect.setWidth(toggleSize);
1009
1010             QStyleOption opt;
1011             opt.initFrom(this);
1012             opt.rect = rect;
1013             rect = style()->subElementRect(QStyle::SE_TreeViewDisclosureItem, &opt, this);
1014
1015             return rect.contains(pos);
1016         }
1017     }
1018     return false;
1019 }
1020
1021 DolphinDetailsView::ElasticBand::ElasticBand() :
1022     show(false),
1023     origin(),
1024     destination(),
1025     lastSelectionOrigin(),
1026     lastSelectionDestination(),
1027     ignoreOldInfo(true),
1028     outsideNearestLeftEdge(0),
1029     outsideNearestRightEdge(0),
1030     insideNearestLeftEdge(0),
1031     insideNearestRightEdge(0)
1032 {
1033 }
1034
1035 #include "dolphindetailsview.moc"