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