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