src/dolphincolumnview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Peter Penz <peter.penz@gmx.at>                  *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "dolphincolumnview.h"
  21
  22 #include "dolphinmodel.h"
  23 #include "dolphincontroller.h"
  24 #include "dolphinsettings.h"
  25
  26 #include "dolphin_columnmodesettings.h"
  27
  28 #include <kcolorutils.h>
  29 #include <kcolorscheme.h>
  30 #include <kdirlister.h>
  31
  32 #include <QAbstractProxyModel>
  33 #include <QApplication>
  34 #include <QPoint>
  35 #include <QScrollBar>
  36 #include <QTimeLine>
  37
  38 /**
  39  * Represents one column inside the DolphinColumnView and has been
  40  * extended to respect view options and hovering information.
  41  */
  42 class ColumnWidget : public QListView
  43 {
  44 public:
  45     ColumnWidget(QWidget* parent,
  46                  DolphinColumnView* columnView,
  47                  const KUrl& url);
  48     virtual ~ColumnWidget();
  49
  50     /** Sets the size of the icons. */
  51     void setDecorationSize(const QSize& size);
  52
  53     /**
  54      * An active column is defined as column, which shows the same URL
  55      * as indicated by the URL navigator. The active column is usually
  56      * drawn in a lighter color. All operations are applied to this column.
  57      */
  58     void setActive(bool active);
  59     inline bool isActive() const;
  60
  61     /**
  62      * Sets the directory URL of the child column that is shown next to
  63      * this column. This property is only used for a visual indication
  64      * of the shown directory, it does not trigger a loading of the model.
  65      */
  66     inline void setChildUrl(const KUrl& url);
  67     inline const KUrl& childUrl() const;
  68
  69     /**
  70      * Returns the directory URL that is shown inside the column widget.
  71      */
  72     inline const KUrl& url() const;
  73
  74 protected:
  75     virtual QStyleOptionViewItem viewOptions() const;
  76     virtual void dragEnterEvent(QDragEnterEvent* event);
  77     virtual void dragLeaveEvent(QDragLeaveEvent* event);
  78     virtual void dragMoveEvent(QDragMoveEvent* event);
  79     virtual void dropEvent(QDropEvent* event);
  80     virtual void paintEvent(QPaintEvent* event);
  81     virtual void mousePressEvent(QMouseEvent* event);
  82     virtual void keyPressEvent(QKeyEvent* event);
  83     virtual void contextMenuEvent(QContextMenuEvent* event);
  84     virtual void selectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
  85
  86 private:
  87     /** Used by ColumnWidget::setActive(). */
  88     void activate();
  89
  90     /** Used by ColumnWidget::setActive(). */
  91     void deactivate();
  92
  93 private:
  94     bool m_active;
  95     DolphinColumnView* m_view;
  96     KUrl m_url;      // URL of the directory that is shown
  97     KUrl m_childUrl; // URL of the next column that is shown
  98     QStyleOptionViewItem m_viewOptions;
  99
 100     bool m_dragging;   // TODO: remove this property when the issue #160611 is solved in Qt 4.4
 101     QRect m_dropRect;  // TODO: remove this property when the issue #160611 is solved in Qt 4.4
 102 };
 103
 104 ColumnWidget::ColumnWidget(QWidget* parent,
 105                            DolphinColumnView* columnView,
 106                            const KUrl& url) :
 107     QListView(parent),
 108     m_active(true),
 109     m_view(columnView),
 110     m_url(url),
 111     m_childUrl(),
 112     m_dragging(false),
 113     m_dropRect()
 114 {
 115     setMouseTracking(true);
 116     viewport()->setAttribute(Qt::WA_Hover);
 117     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 118     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 119     setSelectionBehavior(SelectItems);
 120     setSelectionMode(QAbstractItemView::ExtendedSelection);
 121     setDragDropMode(QAbstractItemView::DragDrop);
 122     setDropIndicatorShown(false);
 123     setFocusPolicy(Qt::NoFocus);
 124
 125     // apply the column mode settings to the widget
 126     const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 127     Q_ASSERT(settings != 0);
 128
 129     m_viewOptions = QListView::viewOptions();
 130
 131     QFont font(settings->fontFamily(), settings->fontSize());
 132     font.setItalic(settings->italicFont());
 133     font.setBold(settings->boldFont());
 134     m_viewOptions.font = font;
 135
 136     const int iconSize = settings->iconSize();
 137     m_viewOptions.decorationSize = QSize(iconSize, iconSize);
 138
 139     KFileItemDelegate* delegate = new KFileItemDelegate(this);
 140     setItemDelegate(delegate);
 141
 142     activate();
 143
 144     connect(this, SIGNAL(entered(const QModelIndex&)),
 145             m_view->m_controller, SLOT(emitItemEntered(const QModelIndex&)));
 146     connect(this, SIGNAL(viewportEntered()),
 147             m_view->m_controller, SLOT(emitViewportEntered()));
 148 }
 149
 150 ColumnWidget::~ColumnWidget()
 151 {
 152 }
 153
 154 void ColumnWidget::setDecorationSize(const QSize& size)
 155 {
 156     m_viewOptions.decorationSize = size;
 157     doItemsLayout();
 158 }
 159
 160 void ColumnWidget::setActive(bool active)
 161 {
 162     if (m_active == active) {
 163         return;
 164     }
 165
 166     m_active = active;
 167
 168     if (active) {
 169         activate();
 170     } else {
 171         deactivate();
 172     }
 173 }
 174
 175 inline bool ColumnWidget::isActive() const
 176 {
 177     return m_active;
 178 }
 179
 180 inline void ColumnWidget::setChildUrl(const KUrl& url)
 181 {
 182     m_childUrl = url;
 183 }
 184
 185 inline const KUrl& ColumnWidget::childUrl() const
 186 {
 187     return m_childUrl;
 188 }
 189
 190 const KUrl& ColumnWidget::url() const
 191 {
 192     return m_url;
 193 }
 194
 195 QStyleOptionViewItem ColumnWidget::viewOptions() const
 196 {
 197     return m_viewOptions;
 198 }
 199
 200 void ColumnWidget::dragEnterEvent(QDragEnterEvent* event)
 201 {
 202     if (event->mimeData()->hasUrls()) {
 203         event->acceptProposedAction();
 204     }
 205
 206     m_dragging = true;
 207 }
 208
 209 void ColumnWidget::dragLeaveEvent(QDragLeaveEvent* event)
 210 {
 211     QListView::dragLeaveEvent(event);
 212
 213     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 214     m_dragging = false;
 215     setDirtyRegion(m_dropRect);
 216 }
 217
 218 void ColumnWidget::dragMoveEvent(QDragMoveEvent* event)
 219 {
 220     QListView::dragMoveEvent(event);
 221
 222     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 223     const QModelIndex index = indexAt(event->pos());
 224     setDirtyRegion(m_dropRect);
 225     m_dropRect = visualRect(index);
 226     setDirtyRegion(m_dropRect);
 227 }
 228
 229 void ColumnWidget::dropEvent(QDropEvent* event)
 230 {
 231     const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 232     if (!urls.isEmpty()) {
 233         event->acceptProposedAction();
 234         m_view->m_controller->indicateDroppedUrls(urls,
 235                                                   url(),
 236                                                   indexAt(event->pos()),
 237                                                   event->source());
 238     }
 239     QListView::dropEvent(event);
 240     m_dragging = false;
 241 }
 242
 243 void ColumnWidget::paintEvent(QPaintEvent* event)
 244 {
 245     if (!m_childUrl.isEmpty()) {
 246         // indicate the shown URL of the next column by highlighting the shown folder item
 247         const QModelIndex dirIndex = m_view->m_dolphinModel->indexForUrl(m_childUrl);
 248         const QModelIndex proxyIndex = m_view->m_proxyModel->mapFromSource(dirIndex);
 249         if (proxyIndex.isValid() && !selectionModel()->isSelected(proxyIndex)) {
 250             const QRect itemRect = visualRect(proxyIndex);
 251             QPainter painter(viewport());
 252             painter.save();
 253
 254             QColor color = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
 255             color.setAlpha(32);
 256             painter.setPen(Qt::NoPen);
 257             painter.setBrush(color);
 258             painter.drawRect(itemRect);
 259
 260             painter.restore();
 261         }
 262     }
 263
 264     QListView::paintEvent(event);
 265
 266     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 267     if (m_dragging) {
 268         const QBrush& brush = m_viewOptions.palette.brush(QPalette::Normal, QPalette::Highlight);
 269         DolphinController::drawHoverIndication(viewport(), m_dropRect, brush);
 270     }
 271 }
 272
 273 void ColumnWidget::mousePressEvent(QMouseEvent* event)
 274 {
 275     if (!m_active) {
 276         m_view->requestActivation(this);
 277     }
 278
 279     QListView::mousePressEvent(event);
 280 }
 281
 282 void ColumnWidget::keyPressEvent(QKeyEvent* event)
 283 {
 284     QListView::keyPressEvent(event);
 285
 286     const QItemSelectionModel* selModel = selectionModel();
 287     const QModelIndex currentIndex = selModel->currentIndex();
 288     const bool triggerItem = currentIndex.isValid()
 289                              && (event->key() == Qt::Key_Return)
 290                              && (selModel->selectedIndexes().count() <= 1);
 291     if (triggerItem) {
 292         m_view->triggerItem(currentIndex);
 293     }
 294 }
 295
 296 void ColumnWidget::contextMenuEvent(QContextMenuEvent* event)
 297 {
 298     if (!m_active) {
 299         m_view->requestActivation(this);
 300     }
 301
 302     QListView::contextMenuEvent(event);
 303
 304     const QModelIndex index = indexAt(event->pos());
 305     if (index.isValid() || m_active) {
 306         // Only open a context menu above an item or if the mouse is above
 307         // the active column.
 308         const QPoint pos = m_view->viewport()->mapFromGlobal(event->globalPos());
 309         m_view->m_controller->triggerContextMenuRequest(pos);
 310     }
 311 }
 312
 313 void ColumnWidget::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
 314 {
 315     QListView::selectionChanged(selected, deselected);
 316
 317     QItemSelectionModel* selModel = m_view->selectionModel();
 318     selModel->select(selected, QItemSelectionModel::Select);
 319     selModel->select(deselected, QItemSelectionModel::Deselect);
 320 }
 321
 322 void ColumnWidget::activate()
 323 {
 324     if (m_view->hasFocus()) {
 325         setFocus(Qt::OtherFocusReason);
 326     }
 327     m_view->setFocusProxy(this);
 328
 329     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
 330     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
 331     // necessary connecting the signal 'singleClick()' or 'doubleClick'.
 332     if (KGlobalSettings::singleClick()) {
 333         connect(this, SIGNAL(clicked(const QModelIndex&)),
 334                 m_view, SLOT(triggerItem(const QModelIndex&)));
 335     } else {
 336         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 337                 m_view, SLOT(triggerItem(const QModelIndex&)));
 338     }
 339
 340     const QColor bgColor = KColorScheme(QPalette::Active, KColorScheme::View).background().color();
 341     QPalette palette = viewport()->palette();
 342     palette.setColor(viewport()->backgroundRole(), bgColor);
 343     viewport()->setPalette(palette);
 344
 345     if (!m_childUrl.isEmpty()) {
 346         // assure that the current index is set on the index that represents
 347         // the child URL
 348         const QModelIndex dirIndex = m_view->m_dolphinModel->indexForUrl(m_childUrl);
 349         const QModelIndex proxyIndex = m_view->m_proxyModel->mapFromSource(dirIndex);
 350         selectionModel()->setCurrentIndex(proxyIndex, QItemSelectionModel::Current);
 351     }
 352
 353     update();
 354 }
 355
 356 void ColumnWidget::deactivate()
 357 {
 358     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
 359     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
 360     // necessary connecting the signal 'singleClick()' or 'doubleClick'.
 361     if (KGlobalSettings::singleClick()) {
 362         disconnect(this, SIGNAL(clicked(const QModelIndex&)),
 363                    m_view, SLOT(triggerItem(const QModelIndex&)));
 364     } else {
 365         disconnect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 366                    m_view, SLOT(triggerItem(const QModelIndex&)));
 367     }
 368
 369     QColor bgColor = KColorScheme(QPalette::Active, KColorScheme::View).background().color();
 370     const QColor fgColor = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
 371     bgColor = KColorUtils::mix(bgColor, fgColor, 0.04);
 372
 373     QPalette palette = viewport()->palette();
 374     palette.setColor(viewport()->backgroundRole(), bgColor);
 375     viewport()->setPalette(palette);
 376
 377     selectionModel()->clear();
 378
 379     update();
 380 }
 381
 382 // ---
 383
 384 DolphinColumnView::DolphinColumnView(QWidget* parent, DolphinController* controller) :
 385     QAbstractItemView(parent),
 386     m_controller(controller),
 387     m_index(-1),
 388     m_contentX(0),
 389     m_columns(),
 390     m_animation(0),
 391     m_dolphinModel(0),
 392     m_proxyModel(0)
 393 {
 394     Q_ASSERT(controller != 0);
 395
 396     setAcceptDrops(true);
 397     setDragDropMode(QAbstractItemView::DragDrop);
 398     setDropIndicatorShown(false);
 399     setSelectionMode(ExtendedSelection);
 400
 401     connect(this, SIGNAL(entered(const QModelIndex&)),
 402             controller, SLOT(emitItemEntered(const QModelIndex&)));
 403     connect(this, SIGNAL(viewportEntered()),
 404             controller, SLOT(emitViewportEntered()));
 405     connect(controller, SIGNAL(zoomIn()),
 406             this, SLOT(zoomIn()));
 407     connect(controller, SIGNAL(zoomOut()),
 408             this, SLOT(zoomOut()));
 409     connect(controller, SIGNAL(urlChanged(const KUrl&)),
 410             this, SLOT(showColumn(const KUrl&)));
 411
 412     connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 413             this, SLOT(moveContentHorizontally(int)));
 414
 415     ColumnWidget* column = new ColumnWidget(viewport(), this, m_controller->url());
 416     m_columns.append(column);
 417     setActiveColumnIndex(0);
 418
 419     updateDecorationSize();
 420
 421     m_animation = new QTimeLine(500, this);
 422     connect(m_animation, SIGNAL(frameChanged(int)), horizontalScrollBar(), SLOT(setValue(int)));
 423 }
 424
 425 DolphinColumnView::~DolphinColumnView()
 426 {
 427 }
 428
 429 QModelIndex DolphinColumnView::indexAt(const QPoint& point) const
 430 {
 431     foreach (ColumnWidget* column, m_columns) {
 432         const QPoint topLeft = column->frameGeometry().topLeft();
 433         const QPoint adjustedPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
 434         const QModelIndex index = column->indexAt(adjustedPoint);
 435         if (index.isValid()) {
 436             return index;
 437         }
 438     }
 439
 440     return QModelIndex();
 441 }
 442
 443 void DolphinColumnView::scrollTo(const QModelIndex& index, ScrollHint hint)
 444 {
 445     activeColumn()->scrollTo(index, hint);
 446 }
 447
 448 QRect DolphinColumnView::visualRect(const QModelIndex& index) const
 449 {
 450     return activeColumn()->visualRect(index);
 451 }
 452
 453 void DolphinColumnView::setModel(QAbstractItemModel* model)
 454 {
 455     if (m_dolphinModel != 0) {
 456         m_dolphinModel->disconnect(this);
 457     }
 458
 459     m_proxyModel = static_cast<const QAbstractProxyModel*>(model);
 460     m_dolphinModel = static_cast<const DolphinModel*>(m_proxyModel->sourceModel());
 461     connect(m_dolphinModel, SIGNAL(expand(const QModelIndex&)),
 462             this, SLOT(triggerReloadColumns(const QModelIndex&)));
 463
 464     activeColumn()->setModel(model);
 465     QAbstractItemView::setModel(model);
 466 }
 467
 468 void DolphinColumnView::reload()
 469 {
 470     deleteInactiveChildColumns();
 471
 472     // Due to the reloading of the model all columns will be reset to show
 473     // the same content as the first column. As this is not wanted, all columns
 474     // except of the first column are temporary hidden until the root index can
 475     // be updated again.
 476     QList<ColumnWidget*>::iterator start = m_columns.begin() + 1;
 477     QList<ColumnWidget*>::iterator end = m_columns.end();
 478     for (QList<ColumnWidget*>::iterator it = start; it != end; ++it) {
 479         (*it)->hide();
 480         (*it)->setRootIndex(QModelIndex());
 481    }
 482
 483     // all columns are hidden, now reload the directory lister
 484     KDirLister* dirLister = m_dolphinModel->dirLister();
 485     connect(dirLister, SIGNAL(completed()),
 486             this, SLOT(expandToActiveUrl()));
 487     const KUrl baseUrl = m_columns[0]->url();
 488     dirLister->openUrl(baseUrl, false, true);
 489 }
 490
 491 bool DolphinColumnView::isIndexHidden(const QModelIndex& index) const
 492 {
 493     Q_UNUSED(index);
 494     return false;//activeColumn()->isIndexHidden(index);
 495 }
 496
 497 QModelIndex DolphinColumnView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
 498 {
 499     // Parts of this code have been taken from QColumnView::moveCursor().
 500     // Copyright (C) 1992-2007 Trolltech ASA.
 501
 502     Q_UNUSED(modifiers);
 503     if (model() == 0) {
 504         return QModelIndex();
 505     }
 506
 507     const QModelIndex current = currentIndex();
 508     if (isRightToLeft()) {
 509         if (cursorAction == MoveLeft) {
 510             cursorAction = MoveRight;
 511         } else if (cursorAction == MoveRight) {
 512             cursorAction = MoveLeft;
 513         }
 514     }
 515
 516     switch (cursorAction) {
 517     case MoveLeft:
 518         if (m_index > 0) {
 519             setActiveColumnIndex(m_index - 1);
 520         }
 521         break;
 522
 523     case MoveRight:
 524         if (m_index < m_columns.count() - 1) {
 525             setActiveColumnIndex(m_index + 1);
 526         }
 527         break;
 528
 529     default:
 530         break;
 531     }
 532
 533     return QModelIndex();
 534 }
 535
 536 void DolphinColumnView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags)
 537 {
 538     Q_UNUSED(rect);
 539     Q_UNUSED(flags);
 540     //activeColumn()->setSelection(rect, flags);
 541 }
 542
 543 QRegion DolphinColumnView::visualRegionForSelection(const QItemSelection& selection) const
 544 {
 545     Q_UNUSED(selection);
 546     return QRegion(); //activeColumn()->visualRegionForSelection(selection);
 547 }
 548
 549 int DolphinColumnView::horizontalOffset() const
 550 {
 551     return -m_contentX;
 552 }
 553
 554 int DolphinColumnView::verticalOffset() const
 555 {
 556     return 0;
 557 }
 558
 559 void DolphinColumnView::mousePressEvent(QMouseEvent* event)
 560 {
 561     m_controller->triggerActivation();
 562     QAbstractItemView::mousePressEvent(event);
 563 }
 564
 565 void DolphinColumnView::resizeEvent(QResizeEvent* event)
 566 {
 567     QAbstractItemView::resizeEvent(event);
 568     layoutColumns();
 569     updateScrollBar();
 570 }
 571
 572 void DolphinColumnView::zoomIn()
 573 {
 574     if (isZoomInPossible()) {
 575         ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 576         // TODO: get rid of K3Icon sizes
 577         switch (settings->iconSize()) {
 578         case K3Icon::SizeSmall:  settings->setIconSize(K3Icon::SizeMedium); break;
 579         case K3Icon::SizeMedium: settings->setIconSize(K3Icon::SizeLarge); break;
 580         default: Q_ASSERT(false); break;
 581         }
 582         updateDecorationSize();
 583     }
 584 }
 585
 586 void DolphinColumnView::zoomOut()
 587 {
 588     if (isZoomOutPossible()) {
 589         ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 590         // TODO: get rid of K3Icon sizes
 591         switch (settings->iconSize()) {
 592         case K3Icon::SizeLarge:  settings->setIconSize(K3Icon::SizeMedium); break;
 593         case K3Icon::SizeMedium: settings->setIconSize(K3Icon::SizeSmall); break;
 594         default: Q_ASSERT(false); break;
 595         }
 596         updateDecorationSize();
 597     }
 598 }
 599
 600 void DolphinColumnView::triggerItem(const QModelIndex& index)
 601 {
 602     m_controller->triggerItem(index);
 603
 604     const Qt::KeyboardModifiers modifiers = QApplication::keyboardModifiers();
 605     if ((modifiers & Qt::ControlModifier) || (modifiers & Qt::ShiftModifier)) {
 606         return;
 607     }
 608
 609     const KFileItem item = m_dolphinModel->itemForIndex(m_proxyModel->mapToSource(index));
 610     if ((item.url() != activeColumn()->url()) && item.isDir()) {
 611         deleteInactiveChildColumns();
 612
 613         const KUrl& childUrl = m_controller->url();
 614         activeColumn()->setChildUrl(childUrl);
 615
 616         ColumnWidget* column = new ColumnWidget(viewport(), this, childUrl);
 617         column->setModel(model());
 618         column->setRootIndex(index);
 619
 620         m_columns.append(column);
 621
 622         setActiveColumnIndex(m_index + 1);
 623
 624         // Before invoking layoutColumns() the column must be shown. To prevent
 625         // a flickering the initial geometry is set to be invisible.
 626         column->setGeometry(QRect(-1, -1, 1, 1));
 627         column->show();
 628
 629         layoutColumns();
 630         updateScrollBar();
 631         assureVisibleActiveColumn();
 632     }
 633 }
 634
 635 void DolphinColumnView::moveContentHorizontally(int x)
 636 {
 637     m_contentX = -x;
 638     layoutColumns();
 639 }
 640
 641 void DolphinColumnView::showColumn(const KUrl& url)
 642 {
 643     if (!m_columns[0]->url().isParentOf(url)) {
 644         // the URL is no child URL of the column view, hence do nothing
 645         return;
 646     }
 647
 648     int columnIndex = 0;
 649     foreach (ColumnWidget* column, m_columns) {
 650         if (column->url() == url) {
 651             // the column represents already the requested URL, hence activate it
 652             requestActivation(column);
 653             return;
 654         } else if (!column->url().isParentOf(url)) {
 655             // the column is no parent of the requested URL, hence it must
 656             // be deleted and a new column must be loaded
 657             if (columnIndex > 0) {
 658                 setActiveColumnIndex(columnIndex - 1);
 659                 deleteInactiveChildColumns();
 660             }
 661
 662             const QModelIndex dirIndex = m_dolphinModel->indexForUrl(url);
 663             if (dirIndex.isValid()) {
 664                 triggerItem(m_proxyModel->mapFromSource(dirIndex));
 665             }
 666             return;
 667         }
 668         ++columnIndex;
 669     }
 670
 671     // no existing column has been replaced and a new column must be created
 672     const QModelIndex dirIndex = m_dolphinModel->indexForUrl(url);
 673     if (dirIndex.isValid()) {
 674         triggerItem(m_proxyModel->mapFromSource(dirIndex));
 675     }
 676 }
 677
 678 void DolphinColumnView::updateDecorationSize()
 679 {
 680     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 681     const int iconSize = settings->iconSize();
 682
 683     foreach (QObject* object, viewport()->children()) {
 684         if (object->inherits("QListView")) {
 685             ColumnWidget* widget = static_cast<ColumnWidget*>(object);
 686             widget->setDecorationSize(QSize(iconSize, iconSize));
 687         }
 688     }
 689
 690     m_controller->setZoomInPossible(isZoomInPossible());
 691     m_controller->setZoomOutPossible(isZoomOutPossible());
 692
 693     doItemsLayout();
 694 }
 695
 696 void DolphinColumnView::expandToActiveUrl()
 697 {
 698     const KUrl& activeUrl = m_controller->url();
 699     const KUrl baseUrl = m_dolphinModel->dirLister()->url();
 700     if (baseUrl.isParentOf(activeUrl) && (baseUrl != activeUrl)) {
 701         m_dolphinModel->expandToUrl(activeUrl);
 702         reloadColumns();
 703     }
 704 }
 705
 706 void DolphinColumnView::triggerReloadColumns(const QModelIndex& index)
 707 {
 708     Q_UNUSED(index);
 709     disconnect(m_dolphinModel, SIGNAL(expand(const QModelIndex&)),
 710                this, SLOT(triggerReloadColumns(const QModelIndex&)));
 711     // the reloading of the columns may not be done in the context of this slot
 712     QMetaObject::invokeMethod(this, "reloadColumns", Qt::QueuedConnection);
 713 }
 714
 715 void DolphinColumnView::reloadColumns()
 716 {
 717     const int count = m_columns.count() - 1; // ignore the last column
 718     for (int i = 0; i < count; ++i) {
 719         ColumnWidget* nextColumn = m_columns[i + 1];
 720         const QModelIndex rootIndex = nextColumn->rootIndex();
 721         if (!rootIndex.isValid()) {
 722             const QModelIndex dirIndex = m_dolphinModel->indexForUrl(m_columns[i]->childUrl());
 723             const QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 724             if (proxyIndex.isValid()) {
 725                 nextColumn->setRootIndex(proxyIndex);
 726                 nextColumn->show();
 727             }
 728         }
 729     }
 730 }
 731
 732 bool DolphinColumnView::isZoomInPossible() const
 733 {
 734     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 735     return settings->iconSize() < K3Icon::SizeLarge;
 736 }
 737
 738 bool DolphinColumnView::isZoomOutPossible() const
 739 {
 740     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 741     return settings->iconSize() > K3Icon::SizeSmall;
 742 }
 743
 744 void DolphinColumnView::setActiveColumnIndex(int index)
 745 {
 746     if (m_index == index) {
 747         return;
 748     }
 749
 750     const bool hasActiveColumn = (m_index >= 0);
 751     if (hasActiveColumn) {
 752         m_columns[m_index]->setActive(false);
 753     }
 754
 755     m_index = index;
 756     m_columns[m_index]->setActive(true);
 757
 758     m_controller->setUrl(m_columns[m_index]->url());
 759 }
 760
 761 void DolphinColumnView::layoutColumns()
 762 {
 763     int x = m_contentX;
 764     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 765     const int columnWidth = settings->columnWidth();
 766     foreach (ColumnWidget* column, m_columns) {
 767         column->setGeometry(QRect(x, 0, columnWidth, viewport()->height()));
 768         x += columnWidth;
 769     }
 770 }
 771
 772 void DolphinColumnView::updateScrollBar()
 773 {
 774     int contentWidth = 0;
 775     foreach (ColumnWidget* column, m_columns) {
 776         contentWidth += column->width();
 777     }
 778
 779     horizontalScrollBar()->setPageStep(contentWidth);
 780     horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 781 }
 782
 783 void DolphinColumnView::assureVisibleActiveColumn()
 784 {
 785     const int viewportWidth = viewport()->width();
 786     const int x = activeColumn()->x();
 787     const int width = activeColumn()->width();
 788     if (x + width > viewportWidth) {
 789         int newContentX = m_contentX - x - width + viewportWidth;
 790         if (newContentX > 0) {
 791             newContentX = 0;
 792         }
 793         m_animation->setFrameRange(-m_contentX, -newContentX);
 794         m_animation->start();
 795     } else if (x < 0) {
 796         const int newContentX = m_contentX - x;
 797         m_animation->setFrameRange(-m_contentX, -newContentX);
 798         m_animation->start();
 799     }
 800 }
 801
 802 void DolphinColumnView::requestActivation(ColumnWidget* column)
 803 {
 804     if (column->isActive()) {
 805         assureVisibleActiveColumn();
 806     } else {
 807         int index = 0;
 808         foreach (ColumnWidget* currColumn, m_columns) {
 809             if (currColumn == column) {
 810                 setActiveColumnIndex(index);
 811                 assureVisibleActiveColumn();
 812                 return;
 813             }
 814             ++index;
 815         }
 816     }
 817 }
 818
 819 void DolphinColumnView::deleteInactiveChildColumns()
 820 {
 821     QList<ColumnWidget*>::iterator start = m_columns.begin() + m_index + 1;
 822     QList<ColumnWidget*>::iterator end = m_columns.end();
 823     for (QList<ColumnWidget*>::iterator it = start; it != end; ++it) {
 824         (*it)->deleteLater();
 825     }
 826     m_columns.erase(start, end);
 827 }
 828
 829 #include "dolphincolumnview.moc"