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 "viewproperties.h"
  32 #include "zoomlevelinfo.h"
  33
  34 #include "dolphin_detailsmodesettings.h"
  35 #include "dolphin_generalsettings.h"
  36
  37 #include <kdirmodel.h>
  38 #include <klocale.h>
  39 #include <kmenu.h>
  40
  41 #include <QAbstractProxyModel>
  42 #include <QAction>
  43 #include <QApplication>
  44 #include <QHeaderView>
  45 #include <QRubberBand>
  46 #include <QPainter>
  47 #include <QScrollBar>
  48
  49 DolphinDetailsView::DolphinDetailsView(QWidget* parent, DolphinController* controller) :
  50     QTreeView(parent),
  51     m_autoResize(true),
  52     m_expandingTogglePressed(false),
  53     m_keyPressed(false),
  54     m_useDefaultIndexAt(true),
  55     m_ignoreScrollTo(false),
  56     m_controller(controller),
  57     m_selectionManager(0),
  58     m_autoScroller(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
  80     setMouseTracking(true);
  81     m_autoScroller = new DolphinViewAutoScroller(this);
  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     if (DolphinSettings::instance().generalSettings()->showSelectionToggle()) {
 114         m_selectionManager = new SelectionManager(this);
 115         connect(m_selectionManager, SIGNAL(selectionChanged()),
 116                 this, SLOT(requestActivation()));
 117         connect(m_controller, SIGNAL(urlChanged(const KUrl&)),
 118                 m_selectionManager, SLOT(reset()));
 119     }
 120
 121     connect(this, SIGNAL(entered(const QModelIndex&)),
 122             this, SLOT(slotEntered(const QModelIndex&)));
 123     connect(this, SIGNAL(viewportEntered()),
 124             controller, SLOT(emitViewportEntered()));
 125     connect(controller, SIGNAL(zoomLevelChanged(int)),
 126             this, SLOT(setZoomLevel(int)));
 127     connect(controller->dolphinView(), SIGNAL(additionalInfoChanged()),
 128             this, SLOT(updateColumnVisibility()));
 129     connect(controller, SIGNAL(activationChanged(bool)),
 130             this, SLOT(slotActivationChanged(bool)));
 131
 132     if (settings->useSystemFont()) {
 133         m_font = KGlobalSettings::generalFont();
 134     } else {
 135         m_font = QFont(settings->fontFamily(),
 136                        settings->fontSize(),
 137                        settings->fontWeight(),
 138                        settings->italicFont());
 139     }
 140
 141     setVerticalScrollMode(QTreeView::ScrollPerPixel);
 142     setHorizontalScrollMode(QTreeView::ScrollPerPixel);
 143
 144     const DolphinView* view = controller->dolphinView();
 145     connect(view, SIGNAL(showPreviewChanged()),
 146             this, SLOT(slotShowPreviewChanged()));
 147
 148     updateDecorationSize(view->showPreview());
 149
 150     setFocus();
 151     viewport()->installEventFilter(this);
 152
 153     connect(KGlobalSettings::self(), SIGNAL(settingsChanged(int)),
 154             this, SLOT(slotGlobalSettingsChanged(int)));
 155
 156     m_useDefaultIndexAt = false;
 157
 158     m_expandableFoldersAction = new QAction(i18nc("@option:check", "Expandable Folders"), this);
 159     m_expandableFoldersAction->setCheckable(true);
 160     connect(m_expandableFoldersAction, SIGNAL(toggled(bool)),
 161             this, SLOT(setFoldersExpandable(bool)));
 162 }
 163
 164 DolphinDetailsView::~DolphinDetailsView()
 165 {
 166 }
 167
 168 bool DolphinDetailsView::event(QEvent* event)
 169 {
 170     if (event->type() == QEvent::Polish) {
 171         QHeaderView* headerView = header();
 172         headerView->setResizeMode(QHeaderView::Interactive);
 173         headerView->setMovable(false);
 174
 175         updateColumnVisibility();
 176
 177         hideColumn(DolphinModel::Rating);
 178         hideColumn(DolphinModel::Tags);
 179     }
 180
 181     return QTreeView::event(event);
 182 }
 183
 184 QStyleOptionViewItem DolphinDetailsView::viewOptions() const
 185 {
 186     QStyleOptionViewItem viewOptions = QTreeView::viewOptions();
 187     viewOptions.font = m_font;
 188     viewOptions.showDecorationSelected = true;
 189     viewOptions.decorationSize = m_decorationSize;
 190     return viewOptions;
 191 }
 192
 193 void DolphinDetailsView::contextMenuEvent(QContextMenuEvent* event)
 194 {
 195     QTreeView::contextMenuEvent(event);
 196
 197     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 198     m_expandableFoldersAction->setChecked(settings->expandableFolders());
 199     m_controller->triggerContextMenuRequest(event->pos(),
 200                                             QList<QAction*>() << m_expandableFoldersAction);
 201 }
 202
 203 void DolphinDetailsView::mousePressEvent(QMouseEvent* event)
 204 {
 205     m_controller->requestActivation();
 206
 207     const QModelIndex current = currentIndex();
 208     QTreeView::mousePressEvent(event);
 209
 210     m_expandingTogglePressed = false;
 211     const QModelIndex index = indexAt(event->pos());
 212     const bool updateState = index.isValid() &&
 213                              (index.column() == DolphinModel::Name) &&
 214                              (event->button() == Qt::LeftButton);
 215     if (updateState) {
 216         // TODO: See comment in DolphinIconsView::mousePressEvent(). Only update
 217         // the state if no expanding/collapsing area has been hit:
 218         const QRect rect = visualRect(index);
 219         if (event->pos().x() >= rect.x() + indentation()) {
 220             setState(QAbstractItemView::DraggingState);
 221         } else {
 222             m_expandingTogglePressed = true;
 223         }
 224     }
 225
 226     if (!index.isValid() || (index.column() != DolphinModel::Name)) {
 227         // the mouse press is done somewhere outside the filename column
 228         if (QApplication::mouseButtons() & Qt::MidButton) {
 229             m_controller->replaceUrlByClipboard();
 230         }
 231
 232         const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
 233         if (!(modifier & Qt::ShiftModifier) && !(modifier & Qt::ControlModifier)) {
 234             clearSelection();
 235         }
 236
 237         // restore the current index, other columns are handled as viewport area.
 238         // setCurrentIndex(...) implicitly calls scrollTo(...), which we want to ignore.
 239         m_ignoreScrollTo = true;
 240         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 241         m_ignoreScrollTo = false;
 242
 243         if ((event->button() == Qt::LeftButton) && !m_expandingTogglePressed) {
 244             // Inform Qt about what we are doing - otherwise it starts dragging items around!
 245             setState(DragSelectingState);
 246             m_band.show = true;
 247             // Incremental update data will not be useful - start from scratch.
 248             m_band.ignoreOldInfo = true;
 249             const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 250             m_band.origin = event->pos()  + scrollPos;
 251             m_band.destination = m_band.origin;
 252             m_band.originalSelection = selectionModel()->selection();
 253         }
 254     }
 255 }
 256
 257 void DolphinDetailsView::mouseMoveEvent(QMouseEvent* event)
 258 {
 259     if (m_band.show) {
 260         const QPoint mousePos = event->pos();
 261         const QModelIndex index = indexAt(mousePos);
 262         if (!index.isValid()) {
 263             // the destination of the selection rectangle is above the viewport. In this
 264             // case QTreeView does no selection at all, which is not the wanted behavior
 265             // in Dolphin -> select all items within the elastic band rectangle
 266             updateElasticBandSelection();
 267         }
 268
 269         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 270         // as the Qt-issue #199631 has been fixed.
 271         // QTreeView::mouseMoveEvent(event);
 272         QAbstractItemView::mouseMoveEvent(event);
 273         updateElasticBand();
 274     } else {
 275         // TODO: enable QTreeView::mouseMoveEvent(event) again, as soon
 276         // as the Qt-issue #199631 has been fixed.
 277         // QTreeView::mouseMoveEvent(event);
 278         QAbstractItemView::mouseMoveEvent(event);
 279     }
 280
 281     if (m_expandingTogglePressed) {
 282         // Per default QTreeView starts either a selection or a drag operation when dragging
 283         // the expanding toggle button (Qt-issue - see TODO comment in DolphinIconsView::mousePressEvent()).
 284         // Turn off this behavior in Dolphin to stay predictable:
 285         clearSelection();
 286         setState(QAbstractItemView::NoState);
 287     }
 288 }
 289
 290 void DolphinDetailsView::mouseReleaseEvent(QMouseEvent* event)
 291 {
 292     const QModelIndex index = indexAt(event->pos());
 293     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 294         QTreeView::mouseReleaseEvent(event);
 295     } else {
 296         // don't change the current index if the cursor is released
 297         // above any other column than the name column, as the other
 298         // columns act as viewport
 299         const QModelIndex current = currentIndex();
 300         QTreeView::mouseReleaseEvent(event);
 301         selectionModel()->setCurrentIndex(current, QItemSelectionModel::Current);
 302     }
 303
 304     m_expandingTogglePressed = false;
 305     if (m_band.show) {
 306         setState(NoState);
 307         updateElasticBand();
 308         m_band.show = false;
 309     }
 310 }
 311
 312 void DolphinDetailsView::startDrag(Qt::DropActions supportedActions)
 313 {
 314     DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 315     m_band.show = false;
 316 }
 317
 318 void DolphinDetailsView::dragEnterEvent(QDragEnterEvent* event)
 319 {
 320     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 321         event->acceptProposedAction();
 322     }
 323
 324     if (m_band.show) {
 325         updateElasticBand();
 326         m_band.show = false;
 327     }
 328 }
 329
 330 void DolphinDetailsView::dragLeaveEvent(QDragLeaveEvent* event)
 331 {
 332     QTreeView::dragLeaveEvent(event);
 333     setDirtyRegion(m_dropRect);
 334 }
 335
 336 void DolphinDetailsView::dragMoveEvent(QDragMoveEvent* event)
 337 {
 338     QTreeView::dragMoveEvent(event);
 339
 340     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 341     setDirtyRegion(m_dropRect);
 342     const QModelIndex index = indexAt(event->pos());
 343     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 344         const KFileItem item = m_controller->itemForIndex(index);
 345         if (!item.isNull() && item.isDir()) {
 346             m_dropRect = visualRect(index);
 347         } else {
 348             m_dropRect.setSize(QSize()); // set as invalid
 349         }
 350         setDirtyRegion(m_dropRect);
 351     }
 352
 353     if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
 354         // accept url drops, independently from the destination item
 355         event->acceptProposedAction();
 356     }
 357 }
 358
 359 void DolphinDetailsView::dropEvent(QDropEvent* event)
 360 {
 361     const QModelIndex index = indexAt(event->pos());
 362     KFileItem item;
 363     if (index.isValid() && (index.column() == DolphinModel::Name)) {
 364         item = m_controller->itemForIndex(index);
 365     }
 366     m_controller->indicateDroppedUrls(item, m_controller->url(), event);
 367     QTreeView::dropEvent(event);
 368 }
 369
 370 void DolphinDetailsView::paintEvent(QPaintEvent* event)
 371 {
 372     QTreeView::paintEvent(event);
 373     if (m_band.show) {
 374         // The following code has been taken from QListView
 375         // and adapted to DolphinDetailsView.
 376         // (C) 1992-2007 Trolltech ASA
 377         QStyleOptionRubberBand opt;
 378         opt.initFrom(this);
 379         opt.shape = QRubberBand::Rectangle;
 380         opt.opaque = false;
 381         opt.rect = elasticBandRect();
 382
 383         QPainter painter(viewport());
 384         painter.save();
 385         style()->drawControl(QStyle::CE_RubberBand, &opt, &painter);
 386         painter.restore();
 387     }
 388 }
 389
 390 void DolphinDetailsView::keyPressEvent(QKeyEvent* event)
 391 {
 392     // If the Control modifier is pressed, a multiple selection
 393     // is done and DolphinDetailsView::currentChanged() may not
 394     // not change the selection in a custom way.
 395     m_keyPressed = !(event->modifiers() & Qt::ControlModifier);
 396
 397     QTreeView::keyPressEvent(event);
 398     m_controller->handleKeyPressEvent(event);
 399 }
 400
 401 void DolphinDetailsView::keyReleaseEvent(QKeyEvent* event)
 402 {
 403     QTreeView::keyReleaseEvent(event);
 404     m_keyPressed = false;
 405 }
 406
 407 void DolphinDetailsView::resizeEvent(QResizeEvent* event)
 408 {
 409     QTreeView::resizeEvent(event);
 410     if (m_autoResize) {
 411         resizeColumns();
 412     }
 413 }
 414
 415 void DolphinDetailsView::wheelEvent(QWheelEvent* event)
 416 {
 417     if (m_selectionManager != 0) {
 418         m_selectionManager->reset();
 419     }
 420
 421     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 422     if (event->modifiers() & Qt::ControlModifier) {
 423         event->ignore();
 424         return;
 425     }
 426
 427     const int height = m_decorationSize.height();
 428     const int step = (height >= KIconLoader::SizeHuge) ? height / 10 : (KIconLoader::SizeHuge - height) / 2;
 429     verticalScrollBar()->setSingleStep(step);
 430     QTreeView::wheelEvent(event);
 431 }
 432
 433 void DolphinDetailsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 434 {
 435     QTreeView::currentChanged(current, previous);
 436     if (current.isValid() && !m_autoScroller->isActive()) {
 437         scrollTo(current);
 438     }
 439
 440     // Stay consistent with QListView: When changing the current index by key presses,
 441     // also change the selection.
 442     if (m_keyPressed) {
 443         selectionModel()->select(current, QItemSelectionModel::ClearAndSelect);
 444     }
 445 }
 446
 447 bool DolphinDetailsView::eventFilter(QObject* watched, QEvent* event)
 448 {
 449     if ((watched == viewport()) && (event->type() == QEvent::Leave)) {
 450         // if the mouse is above an item and moved very fast outside the widget,
 451         // no viewportEntered() signal might be emitted although the mouse has been moved
 452         // above the viewport
 453         m_controller->emitViewportEntered();
 454     }
 455
 456     return QTreeView::eventFilter(watched, event);
 457 }
 458
 459 QModelIndex DolphinDetailsView::indexAt(const QPoint& point) const
 460 {
 461     // the blank portion of the name column counts as empty space
 462     const QModelIndex index = QTreeView::indexAt(point);
 463     const bool isAboveEmptySpace  = !m_useDefaultIndexAt &&
 464                                     (index.column() == KDirModel::Name) && !nameColumnRect(index).contains(point);
 465     return isAboveEmptySpace ? QModelIndex() : index;
 466 }
 467
 468 void DolphinDetailsView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command)
 469 {
 470     // We must override setSelection() as Qt calls it internally and when this happens
 471     // we must ensure that the default indexAt() is used.
 472     if (!m_band.show) {
 473         m_useDefaultIndexAt = true;
 474         QTreeView::setSelection(rect, command);
 475         m_useDefaultIndexAt = false;
 476     } else {
 477         // Use our own elastic band selection algorithm
 478         updateElasticBandSelection();
 479     }
 480 }
 481
 482 void DolphinDetailsView::scrollTo(const QModelIndex & index, ScrollHint hint)
 483 {
 484     if (!m_ignoreScrollTo) {
 485         QTreeView::scrollTo(index, hint);
 486     }
 487 }
 488
 489 void DolphinDetailsView::setSortIndicatorSection(DolphinView::Sorting sorting)
 490 {
 491     header()->setSortIndicator(sorting, header()->sortIndicatorOrder());
 492 }
 493
 494 void DolphinDetailsView::setSortIndicatorOrder(Qt::SortOrder sortOrder)
 495 {
 496     header()->setSortIndicator(header()->sortIndicatorSection(), sortOrder);
 497 }
 498
 499 void DolphinDetailsView::synchronizeSortingState(int column)
 500 {
 501     // The sorting has already been changed in QTreeView if this slot is
 502     // invoked, but Dolphin is not informed about this.
 503     DolphinView::Sorting sorting = DolphinSortFilterProxyModel::sortingForColumn(column);
 504     const Qt::SortOrder sortOrder = header()->sortIndicatorOrder();
 505     m_controller->indicateSortingChange(sorting);
 506     m_controller->indicateSortOrderChange(sortOrder);
 507 }
 508
 509 void DolphinDetailsView::slotEntered(const QModelIndex& index)
 510 {
 511     if (index.column() == DolphinModel::Name) {
 512         m_controller->emitItemEntered(index);
 513     } else {
 514         m_controller->emitViewportEntered();
 515     }
 516 }
 517
 518 void DolphinDetailsView::updateElasticBand()
 519 {
 520     if (m_band.show) {
 521         QRect dirtyRegion(elasticBandRect());
 522         const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 523         m_band.destination = viewport()->mapFromGlobal(QCursor::pos()) + scrollPos;
 524         // Going above the (logical) top-left of the view causes complications during selection;
 525         // we may as well prevent it.
 526         if (m_band.destination.y() < 0) {
 527             m_band.destination.setY(0);
 528         }
 529         if (m_band.destination.x() < 0) {
 530             m_band.destination.setX(0);
 531         }
 532         dirtyRegion = dirtyRegion.united(elasticBandRect());
 533         setDirtyRegion(dirtyRegion);
 534     }
 535 }
 536
 537 QRect DolphinDetailsView::elasticBandRect() const
 538 {
 539     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 540
 541     const QPoint topLeft = m_band.origin - scrollPos;
 542     const QPoint bottomRight = m_band.destination - scrollPos;
 543     return QRect(topLeft, bottomRight).normalized();
 544 }
 545
 546 void DolphinDetailsView::setZoomLevel(int level)
 547 {
 548     const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
 549     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 550
 551     const bool showPreview = m_controller->dolphinView()->showPreview();
 552     if (showPreview) {
 553         settings->setPreviewSize(size);
 554     } else {
 555         settings->setIconSize(size);
 556     }
 557
 558     updateDecorationSize(showPreview);
 559 }
 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     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 576         const int logicalIndex = headerView->logicalIndex(i);
 577         const QString text = model()->headerData(i, Qt::Horizontal).toString();
 578         QAction* action = popup.addAction(text);
 579         action->setCheckable(true);
 580         action->setChecked(!headerView->isSectionHidden(logicalIndex));
 581         action->setData(i);
 582     }
 583     popup.addSeparator();
 584
 585     QAction* activatedAction = popup.exec(header()->mapToGlobal(pos));
 586     if (activatedAction != 0) {
 587         const bool show = activatedAction->isChecked();
 588         const int columnIndex = activatedAction->data().toInt();
 589
 590         KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 591         const KFileItemDelegate::Information info = infoForColumn(columnIndex);
 592         if (show) {
 593             Q_ASSERT(!list.contains(info));
 594             list.append(info);
 595         } else {
 596             Q_ASSERT(list.contains(info));
 597             const int index = list.indexOf(info);
 598             list.removeAt(index);
 599         }
 600
 601         m_controller->indicateAdditionalInfoChange(list);
 602         setColumnHidden(columnIndex, !show);
 603         resizeColumns();
 604     }
 605 }
 606
 607 void DolphinDetailsView::updateColumnVisibility()
 608 {
 609     const KFileItemDelegate::InformationList list = m_controller->dolphinView()->additionalInfo();
 610     for (int i = DolphinModel::Size; i <= DolphinModel::Type; ++i) {
 611         const KFileItemDelegate::Information info = infoForColumn(i);
 612         const bool hide = !list.contains(info);
 613         if (isColumnHidden(i) != hide) {
 614             setColumnHidden(i, hide);
 615         }
 616     }
 617
 618     resizeColumns();
 619 }
 620
 621 void DolphinDetailsView::slotHeaderSectionResized(int logicalIndex, int oldSize, int newSize)
 622 {
 623     Q_UNUSED(logicalIndex);
 624     Q_UNUSED(oldSize);
 625     Q_UNUSED(newSize);
 626     // If the user changes the size of the headers, the autoresize feature should be
 627     // turned off. As there is no dedicated interface to find out whether the header
 628     // section has been resized by the user or by a resize event, another approach is used.
 629     // Attention: Take care when changing the if-condition to verify that there is no
 630     // regression in combination with bug 178630 (see fix in comment #8).
 631     if ((QApplication::mouseButtons() & Qt::LeftButton) && header()->underMouse()) {
 632         disableAutoResizing();
 633     }
 634 }
 635
 636 void DolphinDetailsView::slotActivationChanged(bool active)
 637 {
 638     setAlternatingRowColors(active);
 639 }
 640
 641 void DolphinDetailsView::disableAutoResizing()
 642 {
 643     m_autoResize = false;
 644 }
 645
 646 void DolphinDetailsView::requestActivation()
 647 {
 648     m_controller->requestActivation();
 649 }
 650
 651 void DolphinDetailsView::slotGlobalSettingsChanged(int category)
 652 {
 653     Q_UNUSED(category);
 654
 655     const DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 656     Q_ASSERT(settings != 0);
 657     if (settings->useSystemFont()) {
 658         m_font = KGlobalSettings::generalFont();
 659     }
 660     //Disconnect then reconnect, since the settings have been changed, the connection requirements may have also.
 661     disconnect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 662     disconnect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 663     if (KGlobalSettings::singleClick()) {
 664         connect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 665     } else {
 666         connect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
 667     }
 668 }
 669
 670 void DolphinDetailsView::updateElasticBandSelection()
 671 {
 672     if (!m_band.show) {
 673         return;
 674     }
 675
 676     // Ensure the elastic band itself is up-to-date, in
 677     // case we are being called due to e.g. a drag event.
 678     updateElasticBand();
 679
 680     // Clip horizontally to the name column, as some filenames will be
 681     // longer than the column.  We don't clip vertically as origin
 682     // may be above or below the current viewport area.
 683     const int nameColumnX = header()->sectionPosition(DolphinModel::Name);
 684     const int nameColumnWidth = header()->sectionSize(DolphinModel::Name);
 685     QRect selRect = elasticBandRect().normalized();
 686     QRect nameColumnArea(nameColumnX, selRect.y(), nameColumnWidth, selRect.height());
 687     selRect = nameColumnArea.intersect(selRect).normalized();
 688     // Get the last elastic band rectangle, expressed in viewpoint coordinates.
 689     const QPoint scrollPos(horizontalScrollBar()->value(), verticalScrollBar()->value());
 690     QRect oldSelRect = QRect(m_band.lastSelectionOrigin - scrollPos, m_band.lastSelectionDestination - scrollPos).normalized();
 691
 692     if (selRect.isNull()) {
 693         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 694         m_band.ignoreOldInfo = true;
 695         return;
 696     }
 697
 698     if (!m_band.ignoreOldInfo) {
 699         // Do some quick checks to see if we can rule out the need to
 700         // update the selection.
 701         Q_ASSERT(uniformRowHeights());
 702         QModelIndex dummyIndex = model()->index(0, 0);
 703         if (!dummyIndex.isValid()) {
 704             // No items in the model presumably.
 705             return;
 706         }
 707
 708         // If the elastic band does not cover the same rows as before, we'll
 709         // need to re-check, and also invalidate the old item distances.
 710         const int rowHeight = QTreeView::rowHeight(dummyIndex);
 711         const bool coveringSameRows =
 712             (selRect.top()    / rowHeight == oldSelRect.top()    / rowHeight) &&
 713             (selRect.bottom() / rowHeight == oldSelRect.bottom() / rowHeight);
 714         if (coveringSameRows) {
 715             // Covering the same rows, but have we moved far enough horizontally
 716             // that we might have (de)selected some other items?
 717             const bool itemSelectionChanged =
 718                 ((selRect.left() > oldSelRect.left()) &&
 719                  (selRect.left() > m_band.insideNearestLeftEdge)) ||
 720                 ((selRect.left() < oldSelRect.left()) &&
 721                  (selRect.left() <= m_band.outsideNearestLeftEdge)) ||
 722                 ((selRect.right() < oldSelRect.right()) &&
 723                  (selRect.left() >= m_band.insideNearestRightEdge)) ||
 724                 ((selRect.right() > oldSelRect.right()) &&
 725                  (selRect.right() >= m_band.outsideNearestRightEdge));
 726
 727             if (!itemSelectionChanged) {
 728                 return;
 729             }
 730         }
 731     }
 732     else {
 733         // This is the only piece of optimization data that needs to be explicitly
 734         // discarded.
 735         m_band.lastSelectionOrigin = QPoint();
 736         m_band.lastSelectionDestination = QPoint();
 737         oldSelRect = selRect;
 738     }
 739
 740     // Do the selection from scratch. Force a update of the horizontal distances info.
 741     m_band.insideNearestLeftEdge   = nameColumnX + nameColumnWidth + 1;
 742     m_band.insideNearestRightEdge  = nameColumnX - 1;
 743     m_band.outsideNearestLeftEdge  = nameColumnX - 1;
 744     m_band.outsideNearestRightEdge = nameColumnX + nameColumnWidth + 1;
 745
 746     // Include the old selection rect as well, so we can deselect
 747     // items that were inside it but not in the new selRect.
 748     const QRect boundingRect = selRect.united(oldSelRect).normalized();
 749     if (boundingRect.isNull()) {
 750         return;
 751     }
 752
 753     // Get the index of the item in this row in the name column.
 754     // TODO - would this still work if the columns could be re-ordered?
 755     QModelIndex startIndex = QTreeView::indexAt(boundingRect.topLeft());
 756     if (startIndex.parent().isValid()) {
 757         startIndex = startIndex.parent().child(startIndex.row(), KDirModel::Name);
 758     } else {
 759         startIndex = model()->index(startIndex.row(), KDirModel::Name);
 760     }
 761     if (!startIndex.isValid()) {
 762         selectionModel()->select(m_band.originalSelection, QItemSelectionModel::ClearAndSelect);
 763         m_band.ignoreOldInfo = true;
 764         return;
 765     }
 766
 767    // Go through all indexes between the top and bottom of boundingRect, and
 768    // update the selection.
 769    const int verticalCutoff = boundingRect.bottom();
 770    QModelIndex currIndex = startIndex;
 771    QModelIndex lastIndex;
 772    bool allItemsInBoundDone = false;
 773
 774    // Calling selectionModel()->select(...) for each item that needs to be
 775    // toggled is slow as each call emits selectionChanged(...) so store them
 776    // and do the selection toggle in one batch.
 777    QItemSelection itemsToToggle;
 778    // QItemSelection's deal with continuous ranges of indexes better than
 779    // single indexes, so try to portion items that need to be toggled into ranges.
 780    bool formingToggleIndexRange = false;
 781    QModelIndex toggleIndexRangeBegin = QModelIndex();
 782
 783    do {
 784        QRect currIndexRect = nameColumnRect(currIndex);
 785
 786         // Update some optimization info as we go.
 787        const int cr = currIndexRect.right();
 788        const int cl = currIndexRect.left();
 789        const int sl = selRect.left();
 790        const int sr = selRect.right();
 791        // "The right edge of the name is outside of the rect but nearer than m_outsideNearestLeft", etc
 792        if ((cr < sl && cr > m_band.outsideNearestLeftEdge)) {
 793            m_band.outsideNearestLeftEdge = cr;
 794        }
 795        if ((cl > sr && cl < m_band.outsideNearestRightEdge)) {
 796            m_band.outsideNearestRightEdge = cl;
 797        }
 798        if ((cl >= sl && cl <= sr && cl > m_band.insideNearestRightEdge)) {
 799            m_band.insideNearestRightEdge = cl;
 800        }
 801        if ((cr >= sl && cr <= sr && cr < m_band.insideNearestLeftEdge)) {
 802            m_band.insideNearestLeftEdge = cr;
 803        }
 804
 805        bool currentlySelected = selectionModel()->isSelected(currIndex);
 806        bool originallySelected = m_band.originalSelection.contains(currIndex);
 807        bool intersectsSelectedRect = currIndexRect.intersects(selRect);
 808        bool shouldBeSelected = (intersectsSelectedRect && !originallySelected) || (!intersectsSelectedRect && originallySelected);
 809        bool needToToggleItem = (currentlySelected && !shouldBeSelected) || (!currentlySelected && shouldBeSelected);
 810        if (needToToggleItem && !formingToggleIndexRange) {
 811             toggleIndexRangeBegin = currIndex;
 812             formingToggleIndexRange = true;
 813        }
 814
 815        // NOTE: indexBelow actually walks up and down expanded trees for us.
 816        QModelIndex nextIndex = indexBelow(currIndex);
 817        allItemsInBoundDone = !nextIndex.isValid() || currIndexRect.top() > verticalCutoff;
 818
 819        const bool commitToggleIndexRange = formingToggleIndexRange &&
 820                                            (!needToToggleItem ||
 821                                             allItemsInBoundDone ||
 822                                             currIndex.parent() != toggleIndexRangeBegin.parent());
 823        if (commitToggleIndexRange) {
 824            formingToggleIndexRange = false;
 825             // If this is the last item in the bounds and it is also the beginning of a range,
 826             // don't toggle lastIndex - it will already have been dealt with.
 827            if (!allItemsInBoundDone || toggleIndexRangeBegin != currIndex) {
 828                itemsToToggle.select(toggleIndexRangeBegin, lastIndex);
 829            }
 830             // Need to start a new range immediately with currIndex?
 831            if (needToToggleItem) {
 832                toggleIndexRangeBegin = currIndex;
 833                formingToggleIndexRange = true;
 834            }
 835            if (allItemsInBoundDone && needToToggleItem) {
 836                 // Toggle the very last item in the bounds.
 837                itemsToToggle.select(currIndex, currIndex);
 838            }
 839        }
 840
 841        // next item
 842        lastIndex = currIndex;
 843        currIndex = nextIndex;
 844     } while (!allItemsInBoundDone);
 845
 846     selectionModel()->select(itemsToToggle, QItemSelectionModel::Toggle);
 847
 848     m_band.lastSelectionOrigin = m_band.origin;
 849     m_band.lastSelectionDestination = m_band.destination;
 850     m_band.ignoreOldInfo = false;
 851 }
 852
 853 void DolphinDetailsView::setFoldersExpandable(bool expandable)
 854 {
 855     if (!expandable) {
 856         // collapse all expanded folders, as QTreeView::setItemsExpandable(false)
 857         // does not do this task
 858         const int rowCount = model()->rowCount();
 859         for (int row = 0; row < rowCount; ++row) {
 860             setExpanded(model()->index(row, 0), false);
 861         }
 862     }
 863     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 864     settings->setExpandableFolders(expandable);
 865     setRootIsDecorated(expandable);
 866     setItemsExpandable(expandable);
 867 }
 868
 869 void DolphinDetailsView::updateDecorationSize(bool showPreview)
 870 {
 871     DetailsModeSettings* settings = DolphinSettings::instance().detailsModeSettings();
 872     const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
 873     setIconSize(QSize(iconSize, iconSize));
 874     m_decorationSize = QSize(iconSize, iconSize);
 875
 876     if (m_selectionManager != 0) {
 877         m_selectionManager->reset();
 878     }
 879
 880     doItemsLayout();
 881 }
 882
 883 KFileItemDelegate::Information DolphinDetailsView::infoForColumn(int columnIndex) const
 884 {
 885     KFileItemDelegate::Information info = KFileItemDelegate::NoInformation;
 886
 887     switch (columnIndex) {
 888     case DolphinModel::Size:         info = KFileItemDelegate::Size; break;
 889     case DolphinModel::ModifiedTime: info = KFileItemDelegate::ModificationTime; break;
 890     case DolphinModel::Permissions:  info = KFileItemDelegate::Permissions; break;
 891     case DolphinModel::Owner:        info = KFileItemDelegate::Owner; break;
 892     case DolphinModel::Group:        info = KFileItemDelegate::OwnerAndGroup; break;
 893     case DolphinModel::Type:         info = KFileItemDelegate::FriendlyMimeType; break;
 894     default: break;
 895     }
 896
 897     return info;
 898 }
 899
 900 void DolphinDetailsView::resizeColumns()
 901 {
 902     // Using the resize mode QHeaderView::ResizeToContents is too slow (it takes
 903     // around 3 seconds for each (!) resize operation when having > 10000 items).
 904     // This gets a problem especially when opening large directories, where several
 905     // resize operations are received for showing the currently available items during
 906     // loading (the application hangs around 20 seconds when loading > 10000 items).
 907
 908     QHeaderView* headerView = header();
 909     QFontMetrics fontMetrics(viewport()->font());
 910
 911     int columnWidth[KDirModel::ColumnCount];
 912     columnWidth[KDirModel::Size] = fontMetrics.width("00000 Items");
 913     columnWidth[KDirModel::ModifiedTime] = fontMetrics.width("0000-00-00 00:00");
 914     columnWidth[KDirModel::Permissions] = fontMetrics.width("xxxxxxxxxx");
 915     columnWidth[KDirModel::Owner] = fontMetrics.width("xxxxxxxxxx");
 916     columnWidth[KDirModel::Group] = fontMetrics.width("xxxxxxxxxx");
 917     columnWidth[KDirModel::Type] = fontMetrics.width("XXXX Xxxxxxx");
 918
 919     int requiredWidth = 0;
 920     for (int i = KDirModel::Size; i <= KDirModel::Type; ++i) {
 921         if (!isColumnHidden(i)) {
 922             columnWidth[i] += 20; // provide a default gap
 923             requiredWidth += columnWidth[i];
 924             headerView->resizeSection(i, columnWidth[i]);
 925         }
 926     }
 927
 928     // resize the name column in a way that the whole available width is used
 929     columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 930
 931     const int minNameWidth = 300;
 932     if (columnWidth[KDirModel::Name] < minNameWidth) {
 933         columnWidth[KDirModel::Name] = minNameWidth;
 934
 935         // It might be possible that the name column width can be
 936         // decreased without clipping any text. For performance
 937         // reasons the exact necessary width for full visible names is
 938         // only checked for up to 200 items:
 939         const int rowCount = model()->rowCount();
 940         if (rowCount > 0 && rowCount < 200) {
 941             const int nameWidth = sizeHintForColumn(DolphinModel::Name);
 942             if (nameWidth + requiredWidth <= viewport()->width()) {
 943                 columnWidth[KDirModel::Name] = viewport()->width() - requiredWidth;
 944             } else if (nameWidth < minNameWidth) {
 945                 columnWidth[KDirModel::Name] = nameWidth;
 946             }
 947         }
 948     }
 949
 950     headerView->resizeSection(KDirModel::Name, columnWidth[KDirModel::Name]);
 951 }
 952
 953 QRect DolphinDetailsView::nameColumnRect(const QModelIndex& index) const
 954 {
 955     QRect rect = visualRect(index);
 956     const KFileItem item = m_controller->itemForIndex(index);
 957     if (!item.isNull()) {
 958         const int width = DolphinFileItemDelegate::nameColumnWidth(item.text(), viewOptions());
 959         rect.setWidth(width);
 960     }
 961
 962     return rect;
 963 }
 964
 965 DolphinDetailsView::ElasticBand::ElasticBand() :
 966     show(false),
 967     origin(),
 968     destination(),
 969     lastSelectionOrigin(),
 970     lastSelectionDestination(),
 971     ignoreOldInfo(true),
 972     outsideNearestLeftEdge(0),
 973     outsideNearestRightEdge(0),
 974     insideNearestLeftEdge(0),
 975     insideNearestRightEdge(0)
 976 {
 977 }
 978
 979 #include "dolphindetailsview.moc"