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 "dolphincontroller.h"
  23 #include "dolphinsettings.h"
  24
  25 #include "dolphin_columnmodesettings.h"
  26
  27 #include <kcolorutils.h>
  28 #include <kcolorscheme.h>
  29 #include <kdirlister.h>
  30 #include <kdirmodel.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 contextMenuEvent(QContextMenuEvent* event);
  83     virtual void selectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
  84
  85 private:
  86     /** Used by ColumnWidget::setActive(). */
  87     void activate();
  88
  89     /** Used by ColumnWidget::setActive(). */
  90     void deactivate();
  91
  92 private:
  93     bool m_active;
  94     DolphinColumnView* m_view;
  95     KUrl m_url;      // URL of the directory that is shown
  96     KUrl m_childUrl; // URL of the next column that is shown
  97     QStyleOptionViewItem m_viewOptions;
  98
  99     bool m_dragging;   // TODO: remove this property when the issue #160611 is solved in Qt 4.4
 100     QRect m_dropRect;  // TODO: remove this property when the issue #160611 is solved in Qt 4.4
 101 };
 102
 103 ColumnWidget::ColumnWidget(QWidget* parent,
 104                            DolphinColumnView* columnView,
 105                            const KUrl& url) :
 106     QListView(columnView),
 107     m_active(true),
 108     m_view(columnView),
 109     m_url(url),
 110     m_childUrl(),
 111     m_dragging(false),
 112     m_dropRect()
 113 {
 114     setMouseTracking(true);
 115     viewport()->setAttribute(Qt::WA_Hover);
 116     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 117     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 118     setSelectionMode(QAbstractItemView::ExtendedSelection);
 119
 120     // apply the column mode settings to the widget
 121     const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 122     Q_ASSERT(settings != 0);
 123
 124     m_viewOptions = QListView::viewOptions();
 125
 126     QFont font(settings->fontFamily(), settings->fontSize());
 127     font.setItalic(settings->italicFont());
 128     font.setBold(settings->boldFont());
 129     m_viewOptions.font = font;
 130
 131     const int iconSize = settings->iconSize();
 132     m_viewOptions.decorationSize = QSize(iconSize, iconSize);
 133
 134     KFileItemDelegate* delegate = new KFileItemDelegate(this);
 135     setItemDelegate(delegate);
 136
 137     activate();
 138
 139     connect(this, SIGNAL(entered(const QModelIndex&)),
 140             m_view->m_controller, SLOT(emitItemEntered(const QModelIndex&)));
 141     connect(this, SIGNAL(viewportEntered()),
 142             m_view->m_controller, SLOT(emitViewportEntered()));
 143 }
 144
 145 ColumnWidget::~ColumnWidget()
 146 {
 147 }
 148
 149 void ColumnWidget::setDecorationSize(const QSize& size)
 150 {
 151     m_viewOptions.decorationSize = size;
 152     doItemsLayout();
 153 }
 154
 155 void ColumnWidget::setActive(bool active)
 156 {
 157     if (m_active == active) {
 158         return;
 159     }
 160
 161     m_active = active;
 162
 163     if (active) {
 164         activate();
 165     } else {
 166         deactivate();
 167     }
 168 }
 169
 170 inline bool ColumnWidget::isActive() const
 171 {
 172     return m_active;
 173 }
 174
 175 inline void ColumnWidget::setChildUrl(const KUrl& url)
 176 {
 177     m_childUrl = url;
 178 }
 179
 180 inline const KUrl& ColumnWidget::childUrl() const
 181 {
 182     return m_childUrl;
 183 }
 184
 185 const KUrl& ColumnWidget::url() const
 186 {
 187     return m_url;
 188 }
 189
 190 QStyleOptionViewItem ColumnWidget::viewOptions() const
 191 {
 192     return m_viewOptions;
 193 }
 194
 195 void ColumnWidget::dragEnterEvent(QDragEnterEvent* event)
 196 {
 197     if (event->mimeData()->hasUrls()) {
 198         event->acceptProposedAction();
 199     }
 200
 201     m_dragging = true;
 202 }
 203
 204 void ColumnWidget::dragLeaveEvent(QDragLeaveEvent* event)
 205 {
 206     QListView::dragLeaveEvent(event);
 207
 208     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 209     m_dragging = false;
 210     setDirtyRegion(m_dropRect);
 211 }
 212
 213 void ColumnWidget::dragMoveEvent(QDragMoveEvent* event)
 214 {
 215     QListView::dragMoveEvent(event);
 216
 217     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 218     const QModelIndex index = indexAt(event->pos());
 219     setDirtyRegion(m_dropRect);
 220     m_dropRect = visualRect(index);
 221     setDirtyRegion(m_dropRect);
 222 }
 223
 224 void ColumnWidget::dropEvent(QDropEvent* event)
 225 {
 226     const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 227     if (!urls.isEmpty()) {
 228         event->acceptProposedAction();
 229         m_view->m_controller->indicateDroppedUrls(urls,
 230                                                   indexAt(event->pos()),
 231                                                   event->source());
 232     }
 233     QListView::dropEvent(event);
 234     m_dragging = false;
 235 }
 236
 237 void ColumnWidget::paintEvent(QPaintEvent* event)
 238 {
 239     if (!m_childUrl.isEmpty()) {
 240         // indicate the shown URL of the next column by highlighting the shown folder item
 241         const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(m_view->model());
 242         const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
 243         const QModelIndex dirIndex = dirModel->indexForUrl(m_childUrl);
 244         const QModelIndex proxyIndex = proxyModel->mapFromSource(dirIndex);
 245         if (proxyIndex.isValid() && !selectionModel()->isSelected(proxyIndex)) {
 246             const QRect itemRect = visualRect(proxyIndex);
 247             QPainter painter(viewport());
 248             painter.save();
 249
 250             QColor color = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
 251             color.setAlpha(32);
 252             painter.setPen(Qt::NoPen);
 253             painter.setBrush(color);
 254             painter.drawRect(itemRect);
 255
 256             painter.restore();
 257         }
 258     }
 259
 260     QListView::paintEvent(event);
 261
 262     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 263     if (m_dragging) {
 264         const QBrush& brush = m_viewOptions.palette.brush(QPalette::Normal, QPalette::Highlight);
 265         DolphinController::drawHoverIndication(viewport(), m_dropRect, brush);
 266     }
 267 }
 268
 269 void ColumnWidget::mousePressEvent(QMouseEvent* event)
 270 {
 271     if (!m_active) {
 272         m_view->requestActivation(this);
 273     }
 274
 275     QListView::mousePressEvent(event);
 276 }
 277
 278 void ColumnWidget::contextMenuEvent(QContextMenuEvent* event)
 279 {
 280     if (!m_active) {
 281         m_view->requestActivation(this);
 282     }
 283
 284     QListView::contextMenuEvent(event);
 285
 286     const QModelIndex index = indexAt(event->pos());
 287     if (index.isValid() || m_active) {
 288         // Only open a context menu above an item or if the mouse is above
 289         // the active column.
 290         const QPoint pos = m_view->viewport()->mapFromGlobal(event->globalPos());
 291         m_view->m_controller->triggerContextMenuRequest(pos);
 292     }
 293 }
 294
 295 void ColumnWidget::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
 296 {
 297     QItemSelectionModel* selModel = m_view->selectionModel();
 298     selModel->select(selected, QItemSelectionModel::Select);
 299     selModel->select(deselected, QItemSelectionModel::Deselect);
 300 }
 301
 302 void ColumnWidget::activate()
 303 {
 304     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
 305     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
 306     // necessary connecting the signal 'singleClick()' or 'doubleClick'.
 307     if (KGlobalSettings::singleClick()) {
 308         connect(this, SIGNAL(clicked(const QModelIndex&)),
 309                 m_view, SLOT(triggerItem(const QModelIndex&)));
 310     } else {
 311         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 312                 m_view, SLOT(triggerItem(const QModelIndex&)));
 313     }
 314
 315     const QColor bgColor = KColorScheme(QPalette::Active, KColorScheme::View).background().color();
 316     QPalette palette = viewport()->palette();
 317     palette.setColor(viewport()->backgroundRole(), bgColor);
 318     viewport()->setPalette(palette);
 319
 320     update();
 321 }
 322
 323 void ColumnWidget::deactivate()
 324 {
 325     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
 326     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
 327     // necessary connecting the signal 'singleClick()' or 'doubleClick'.
 328     if (KGlobalSettings::singleClick()) {
 329         disconnect(this, SIGNAL(clicked(const QModelIndex&)),
 330                    m_view, SLOT(triggerItem(const QModelIndex&)));
 331     } else {
 332         disconnect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 333                    m_view, SLOT(triggerItem(const QModelIndex&)));
 334     }
 335
 336     QColor bgColor = KColorScheme(QPalette::Active, KColorScheme::View).background().color();
 337     const QColor fgColor = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
 338     bgColor = KColorUtils::mix(bgColor, fgColor, 0.04);
 339
 340     QPalette palette = viewport()->palette();
 341     palette.setColor(viewport()->backgroundRole(), bgColor);
 342     viewport()->setPalette(palette);
 343
 344     selectionModel()->clear();
 345
 346     update();
 347 }
 348
 349 // ---
 350
 351 DolphinColumnView::DolphinColumnView(QWidget* parent, DolphinController* controller) :
 352     QAbstractItemView(parent),
 353     m_controller(controller),
 354     m_index(-1),
 355     m_contentX(0),
 356     m_columns(),
 357     m_animation(0)
 358 {
 359     Q_ASSERT(controller != 0);
 360
 361     setAcceptDrops(true);
 362     setDragDropMode(QAbstractItemView::DragDrop);
 363     setDropIndicatorShown(false);
 364     setSelectionMode(ExtendedSelection);
 365
 366     connect(this, SIGNAL(entered(const QModelIndex&)),
 367             controller, SLOT(emitItemEntered(const QModelIndex&)));
 368     connect(this, SIGNAL(viewportEntered()),
 369             controller, SLOT(emitViewportEntered()));
 370     connect(controller, SIGNAL(zoomIn()),
 371             this, SLOT(zoomIn()));
 372     connect(controller, SIGNAL(zoomOut()),
 373             this, SLOT(zoomOut()));
 374     connect(controller, SIGNAL(urlChanged(const KUrl&)),
 375             this, SLOT(showColumn(const KUrl&)));
 376
 377     connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 378             this, SLOT(moveContentHorizontally(int)));
 379
 380     ColumnWidget* column = new ColumnWidget(viewport(), this, m_controller->url());
 381     m_columns.append(column);
 382     setActiveColumnIndex(0);
 383
 384     updateDecorationSize();
 385
 386     m_animation = new QTimeLine(500, this);
 387     connect(m_animation, SIGNAL(frameChanged(int)), horizontalScrollBar(), SLOT(setValue(int)));
 388 }
 389
 390 DolphinColumnView::~DolphinColumnView()
 391 {
 392 }
 393
 394 QModelIndex DolphinColumnView::indexAt(const QPoint& point) const
 395 {
 396     foreach (ColumnWidget* column, m_columns) {
 397         const QPoint topLeft = column->frameGeometry().topLeft();
 398         const QPoint adjustedPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
 399         QModelIndex index = column->indexAt(adjustedPoint);
 400         if (index.isValid()) {
 401             return index;
 402         }
 403     }
 404     return activeColumn()->indexAt(point);
 405
 406     return QModelIndex();
 407 }
 408
 409 void DolphinColumnView::scrollTo(const QModelIndex& index, ScrollHint hint)
 410 {
 411     activeColumn()->scrollTo(index, hint);
 412 }
 413
 414 QRect DolphinColumnView::visualRect(const QModelIndex& index) const
 415 {
 416     return activeColumn()->visualRect(index);
 417 }
 418
 419 void DolphinColumnView::setModel(QAbstractItemModel* model)
 420 {
 421     // TODO: remove all columns
 422
 423     activeColumn()->setModel(model);
 424     QAbstractItemView::setModel(model);
 425 }
 426
 427 bool DolphinColumnView::isIndexHidden(const QModelIndex& index) const
 428 {
 429     return false;//activeColumn()->isIndexHidden(index);
 430 }
 431
 432 QModelIndex DolphinColumnView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
 433 {
 434     return QModelIndex(); //activeColumn()->moveCursor(cursorAction, modifiers);
 435 }
 436
 437 void DolphinColumnView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags)
 438 {
 439     //activeColumn()->setSelection(rect, flags);
 440 }
 441
 442 QRegion DolphinColumnView::visualRegionForSelection(const QItemSelection& selection) const
 443 {
 444     return QRegion(); //activeColumn()->visualRegionForSelection(selection);
 445 }
 446
 447 int DolphinColumnView::horizontalOffset() const
 448 {
 449     return -m_contentX;
 450 }
 451
 452 int DolphinColumnView::verticalOffset() const
 453 {
 454     return 0; // activeColumn()->verticalOffset();
 455 }
 456
 457 void DolphinColumnView::mousePressEvent(QMouseEvent* event)
 458 {
 459     m_controller->triggerActivation();
 460     QAbstractItemView::mousePressEvent(event);
 461 }
 462
 463 void DolphinColumnView::dragEnterEvent(QDragEnterEvent* event)
 464 {
 465     if (event->mimeData()->hasUrls()) {
 466         event->acceptProposedAction();
 467     }
 468 }
 469
 470 void DolphinColumnView::dropEvent(QDropEvent* event)
 471 {
 472     const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 473     if (!urls.isEmpty()) {
 474         m_controller->indicateDroppedUrls(urls,
 475                                           indexAt(event->pos()),
 476                                           event->source());
 477         event->acceptProposedAction();
 478     }
 479     QAbstractItemView::dropEvent(event);
 480 }
 481
 482 void DolphinColumnView::resizeEvent(QResizeEvent* event)
 483 {
 484     QAbstractItemView::resizeEvent(event);
 485     layoutColumns();
 486     updateScrollBar();
 487 }
 488
 489 void DolphinColumnView::zoomIn()
 490 {
 491     if (isZoomInPossible()) {
 492         ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 493         // TODO: get rid of K3Icon sizes
 494         switch (settings->iconSize()) {
 495         case K3Icon::SizeSmall:  settings->setIconSize(K3Icon::SizeMedium); break;
 496         case K3Icon::SizeMedium: settings->setIconSize(K3Icon::SizeLarge); break;
 497         default: Q_ASSERT(false); break;
 498         }
 499         updateDecorationSize();
 500     }
 501 }
 502
 503 void DolphinColumnView::zoomOut()
 504 {
 505     if (isZoomOutPossible()) {
 506         ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 507         // TODO: get rid of K3Icon sizes
 508         switch (settings->iconSize()) {
 509         case K3Icon::SizeLarge:  settings->setIconSize(K3Icon::SizeMedium); break;
 510         case K3Icon::SizeMedium: settings->setIconSize(K3Icon::SizeSmall); break;
 511         default: Q_ASSERT(false); break;
 512         }
 513         updateDecorationSize();
 514     }
 515 }
 516
 517 void DolphinColumnView::triggerItem(const QModelIndex& index)
 518 {
 519     m_controller->triggerItem(index);
 520
 521     const Qt::KeyboardModifiers modifiers = QApplication::keyboardModifiers();
 522     if ((modifiers & Qt::ControlModifier) || (modifiers & Qt::ShiftModifier)) {
 523         return;
 524     }
 525
 526     const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(model());
 527     const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
 528     const KFileItem item = dirModel->itemForIndex(proxyModel->mapToSource(index));
 529     if ((item.url() != activeColumn()->url()) && item.isDir()) {
 530         deleteInactiveChildColumns();
 531
 532         const KUrl& childUrl = m_controller->url();
 533         activeColumn()->setChildUrl(childUrl);
 534
 535         ColumnWidget* column = new ColumnWidget(viewport(), this, childUrl);
 536         column->setModel(model());
 537         column->setRootIndex(index);
 538
 539         m_columns.append(column);
 540
 541         setActiveColumnIndex(m_index + 1);
 542
 543         // Before invoking layoutColumns() the column must be shown. To prevent
 544         // a flickering the initial geometry is set to be invisible.
 545         column->setGeometry(QRect(-1, -1, 1, 1));
 546         column->show();
 547
 548         layoutColumns();
 549         updateScrollBar();
 550         assureVisibleActiveColumn();
 551     }
 552 }
 553
 554 void DolphinColumnView::moveContentHorizontally(int x)
 555 {
 556     m_contentX = -x;
 557     layoutColumns();
 558 }
 559
 560 void DolphinColumnView::showColumn(const KUrl& url)
 561 {
 562     if (!m_columns[0]->url().isParentOf(url)) {
 563         // the URL is no child URL of the column view, hence do nothing
 564         return;
 565     }
 566
 567     int columnIndex = 0;
 568     foreach (ColumnWidget* column, m_columns) {
 569         if (column->url() == url) {
 570             // the column represents already the requested URL, hence activate it
 571             requestActivation(column);
 572             return;
 573         } else if (!column->url().isParentOf(url)) {
 574             // the column is no parent of the requested URL, hence it must
 575             // be deleted and a new column must be loaded
 576             if (columnIndex > 0) {
 577                 setActiveColumnIndex(columnIndex - 1);
 578                 deleteInactiveChildColumns();
 579             }
 580
 581             const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(model());
 582             const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
 583             const QModelIndex dirIndex = dirModel->indexForUrl(url);
 584             if (dirIndex.isValid()) {
 585                 triggerItem(proxyModel->mapFromSource(dirIndex));
 586             }
 587             return;
 588         }
 589         ++columnIndex;
 590     }
 591 }
 592
 593 void DolphinColumnView::updateDecorationSize()
 594 {
 595     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 596     const int iconSize = settings->iconSize();
 597
 598     foreach (QObject* object, viewport()->children()) {
 599         if (object->inherits("QListView")) {
 600             ColumnWidget* widget = static_cast<ColumnWidget*>(object);
 601             widget->setDecorationSize(QSize(iconSize, iconSize));
 602         }
 603     }
 604
 605     m_controller->setZoomInPossible(isZoomInPossible());
 606     m_controller->setZoomOutPossible(isZoomOutPossible());
 607
 608     doItemsLayout();
 609 }
 610
 611 bool DolphinColumnView::isZoomInPossible() const
 612 {
 613     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 614     return settings->iconSize() < K3Icon::SizeLarge;
 615 }
 616
 617 bool DolphinColumnView::isZoomOutPossible() const
 618 {
 619     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 620     return settings->iconSize() > K3Icon::SizeSmall;
 621 }
 622
 623 void DolphinColumnView::setActiveColumnIndex(int index)
 624 {
 625     if (m_index == index) {
 626         return;
 627     }
 628
 629     const bool hasActiveColumn = (m_index >= 0);
 630     if (hasActiveColumn) {
 631         m_columns[m_index]->setActive(false);
 632     }
 633
 634     m_index = index;
 635     m_columns[m_index]->setActive(true);
 636 }
 637
 638 void DolphinColumnView::layoutColumns()
 639 {
 640     int x = m_contentX;
 641     const int columnWidth = 250;
 642     foreach (ColumnWidget* column, m_columns) {
 643         column->setGeometry(QRect(x, 0, columnWidth, viewport()->height()));
 644         x += columnWidth;
 645     }
 646 }
 647
 648 void DolphinColumnView::updateScrollBar()
 649 {
 650     int contentWidth = 0;
 651     foreach (ColumnWidget* column, m_columns) {
 652         contentWidth += column->width();
 653     }
 654
 655     horizontalScrollBar()->setPageStep(contentWidth);
 656     horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 657 }
 658
 659 void DolphinColumnView::assureVisibleActiveColumn()
 660 {
 661     const int viewportWidth = viewport()->width();
 662     const int x = activeColumn()->x();
 663     const int width = activeColumn()->width();
 664     if (x + width > viewportWidth) {
 665         int newContentX = m_contentX - x - width + viewportWidth;
 666         if (newContentX > 0) {
 667             newContentX = 0;
 668         }
 669         m_animation->setFrameRange(-m_contentX, -newContentX);
 670         m_animation->start();
 671     } else if (x < 0) {
 672         const int newContentX = m_contentX - x;
 673         m_animation->setFrameRange(-m_contentX, -newContentX);
 674         m_animation->start();
 675     }
 676 }
 677
 678 void DolphinColumnView::requestActivation(ColumnWidget* column)
 679 {
 680     if (column->isActive()) {
 681         assureVisibleActiveColumn();
 682     } else {
 683         int index = 0;
 684         foreach (ColumnWidget* currColumn, m_columns) {
 685             if (currColumn == column) {
 686                 setActiveColumnIndex(index);
 687                 assureVisibleActiveColumn();
 688                 return;
 689             }
 690             ++index;
 691         }
 692     }
 693 }
 694
 695 void DolphinColumnView::deleteInactiveChildColumns()
 696 {
 697     QList<ColumnWidget*>::iterator start = m_columns.begin() + m_index + 1;
 698     QList<ColumnWidget*>::iterator end = m_columns.end();
 699     for (QList<ColumnWidget*>::iterator it = start; it != end; ++it) {
 700         (*it)->deleteLater();
 701     }
 702     m_columns.erase(start, end);
 703 }
 704
 705 #include "dolphincolumnview.moc"