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