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* Use Nepomuk for getting the meta data instead of KFileMetaInfo.
[dolphin.git] / src / dolphincolumnview.cpp
diff --git a/src/dolphincolumnview.cpp b/src/dolphincolumnview.cpp
index e4669442ccc231519181581a4d8d0bba1c8a0f3a..3b3e86a75578dbd352299f8e6116db2e161ca5c6 100644 (file)
--- a/src/dolphincolumnview.cpp
+++ b/src/dolphincolumnview.cpp
@@ -19,709 +19,593 @@
 
 #include "dolphincolumnview.h"
 
 
 #include "dolphincolumnview.h"
 
+#include "dolphincolumnwidget.h"
 #include "dolphincontroller.h"
 #include "dolphincontroller.h"
-#include "dolphinsettings.h"
+#include "settings/dolphinsettings.h"
+#include "zoomlevelinfo.h"
 
 #include "dolphin_columnmodesettings.h"
 
 
 #include "dolphin_columnmodesettings.h"
 
-#include <kcolorutils.h>
-#include <kcolorscheme.h>
-#include <kdirlister.h>
-#include <kdirmodel.h>
+#include <kfilepreviewgenerator.h>
 
 
-#include <QAbstractProxyModel>
-#include <QApplication>
 #include <QPoint>
 #include <QPoint>
+#include <QScrollBar>
+#include <QTimeLine>
 
 
-/*
- * General implementation notes
- * ----------------------------
- *
- * In Qt4.3 the QColumnView widget has a default behavior regarding the
- * active column and the selection handling, which leads to some usability
- * problems within Dolphin:
- *
- * - No matter which mouse button has been clicked: If the mouse is above
- *   a folder, the folder content will be loaded in the next column. The problem
- *   is that this column also will marked as 'active column' within QColumnView,
- *   hence it is not possible to select more than one folder within a column.
- *
- * - The currently opened folder is not always marked in the left column when
- *   doing drag & drop and selections inside other columns.
- *
- * - The currently active column is visually not recognizable.
- *
- * - It is not possible for derived classes to remove inactive columns.
- *
- * DolphinView tries to bypass those points, but this required some workarounds:
- *
- * - QColumnView internally maps the selection model from the ColumnView to the
- *   active column. As the active column from the Dolphin perspective is different
- *   as the active column from QColumnView, the selection model is adjusted on
- *   each interaction by the methods QColumnWidget::obtainSelectionModel(),
- *   QColumnWidget::releaseSelectionModel() and QColumnView::requestSelectionModel().
- *   QColumnView offers no hook to adjust this behavior, so those methods have to
- *   be invoked throughout the code...
- *
- * - Some copy/paste code from QColumnView is part of DolphinColumnView::createColumn(), but Qt 4.4
- *   will offer a solution for this.
- *
- * - The mousePressEvent() has been customized to prevent that folders are loaded on each
- *   mouse click.
- *
- * We'll try to give some input for Trolltech if the Dolphin solution is stable enough, so hopefully
- * some workarounds can be removed when switching to Qt 4.4 or later.
- */
-
-/**
- * Represents one column inside the DolphinColumnView and has been
- * extended to respect view options and hovering information.
- */
-class ColumnWidget : public QListView
-{
-public:
-    ColumnWidget(QWidget* parent,
-                 DolphinColumnView* columnView,
-                 const KUrl& url);
-    virtual ~ColumnWidget();
-
-    /** Sets the size of the icons. */
-    void setDecorationSize(const QSize& size);
-
-    /**
-     * An active column is defined as column, which shows the same URL
-     * as indicated by the URL navigator. The active column is usually
-     * drawn in a lighter color. All operations are applied to this column.
-     */
-    void setActive(bool active);
-    inline bool isActive() const;
-
-    inline const KUrl& url() const;
-
-    /**
-     * Obtains the selection model from the column view. This assures that
-     * selections of the column view will always applied to the active column.
-     */
-    void obtainSelectionModel();
-
-    /**
-     * Releases the selection model from the column view and replaces it by
-     * a custom selection model.
-     */
-    void releaseSelectionModel();
-
-protected:
-    virtual QStyleOptionViewItem viewOptions() const;
-    virtual void dragEnterEvent(QDragEnterEvent* event);
-    virtual void dragLeaveEvent(QDragLeaveEvent* event);
-    virtual void dragMoveEvent(QDragMoveEvent* event);
-    virtual void dropEvent(QDropEvent* event);
-    virtual void mousePressEvent(QMouseEvent* event);
-    virtual void mouseMoveEvent(QMouseEvent* event);
-    virtual void mouseReleaseEvent(QMouseEvent* event);
-    virtual void paintEvent(QPaintEvent* event);
-    virtual void contextMenuEvent(QContextMenuEvent* event);
-
-protected slots:
-    virtual void selectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
-
-private:
-    /** Used by ColumnWidget::setActive(). */
-    void activate();
-
-    /** Used by ColumnWidget::setActive(). */
-    void deactivate();
-
-private:
-    bool m_active;
-    bool m_swallowMouseMoveEvents;
-    DolphinColumnView* m_view;
-    KUrl m_url;
-    KUrl m_childUrl; // URL of the next column that is shown
-    QStyleOptionViewItem m_viewOptions;
-
-    bool m_dragging;   // TODO: remove this property when the issue #160611 is solved in Qt 4.4
-    QRect m_dropRect;  // TODO: remove this property when the issue #160611 is solved in Qt 4.4
-};
-
-ColumnWidget::ColumnWidget(QWidget* parent,
-                           DolphinColumnView* columnView,
-                           const KUrl& url) :
-    QListView(parent),
-    m_active(true),
-    m_swallowMouseMoveEvents(false),
-    m_view(columnView),
-    m_url(url),
-    m_childUrl(),
-    m_dragging(false),
-    m_dropRect()
-{
-    setMouseTracking(true);
-    viewport()->setAttribute(Qt::WA_Hover);
-
-    // apply the column mode settings to the widget
-    const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    Q_ASSERT(settings != 0);
-
-    m_viewOptions = QListView::viewOptions();
-
-    QFont font(settings->fontFamily(), settings->fontSize());
-    font.setItalic(settings->italicFont());
-    font.setBold(settings->boldFont());
-    m_viewOptions.font = font;
-
-    const int iconSize = settings->iconSize();
-    m_viewOptions.decorationSize = QSize(iconSize, iconSize);
-
-    activate();
-}
-
-ColumnWidget::~ColumnWidget()
-{
-}
-
-void ColumnWidget::setDecorationSize(const QSize& size)
-{
-    m_viewOptions.decorationSize = size;
-    doItemsLayout();
+DolphinColumnView::DolphinColumnView(QWidget* parent, DolphinController* controller) :
+    QAbstractItemView(parent),
+    m_controller(controller),
+    m_active(false),
+    m_index(-1),
+    m_contentX(0),
+    m_columns(),
+    m_emptyViewport(0),
+    m_animation(0),
+    m_nameFilter()
+{
+    Q_ASSERT(controller != 0);
+
+    setAcceptDrops(true);
+    setDragDropMode(QAbstractItemView::DragDrop);
+    setDropIndicatorShown(false);
+    setSelectionMode(ExtendedSelection);
+    setFocusPolicy(Qt::NoFocus);
+    setFrameShape(QFrame::NoFrame);
+    setLayoutDirection(Qt::LeftToRight);
+
+    connect(this, SIGNAL(viewportEntered()),
+            controller, SLOT(emitViewportEntered()));
+    connect(controller, SIGNAL(zoomLevelChanged(int)),
+            this, SLOT(setZoomLevel(int)));
+    connect(controller, SIGNAL(activationChanged(bool)),
+            this, SLOT(updateColumnsBackground(bool)));
+
+    const DolphinView* view = controller->dolphinView();
+    connect(view, SIGNAL(sortingChanged(DolphinView::Sorting)),
+            this, SLOT(slotSortingChanged(DolphinView::Sorting)));
+    connect(view, SIGNAL(sortOrderChanged(Qt::SortOrder)),
+            this, SLOT(slotSortOrderChanged(Qt::SortOrder)));
+    connect(view, SIGNAL(showHiddenFilesChanged()),
+            this, SLOT(slotShowHiddenFilesChanged()));
+    connect(view, SIGNAL(showPreviewChanged()),
+            this, SLOT(slotShowPreviewChanged()));
+
+    connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
+            this, SLOT(moveContentHorizontally(int)));
+
+    m_animation = new QTimeLine(500, this);
+    connect(m_animation, SIGNAL(frameChanged(int)), horizontalScrollBar(), SLOT(setValue(int)));
+
+    DolphinColumnWidget* column = new DolphinColumnWidget(viewport(), this, m_controller->url());
+    m_columns.append(column);
+    setActiveColumnIndex(0);
+
+    m_emptyViewport = new QFrame(viewport());
+    m_emptyViewport->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
+
+    updateDecorationSize(view->showPreview());
+    updateColumnsBackground(true);
 }
 
 }
 
-void ColumnWidget::setActive(bool active)
+DolphinColumnView::~DolphinColumnView()
 {
 {
-    if (active) {
-        obtainSelectionModel();
-    } else {
-        releaseSelectionModel();
-    }
+}
 
 
-    if (m_active == active) {
-        return;
+QModelIndex DolphinColumnView::indexAt(const QPoint& point) const
+{
+    foreach (DolphinColumnWidget* column, m_columns) {
+        const QModelIndex index = column->indexAt(columnPosition(column, point));
+        if (index.isValid()) {
+            return index;
+        }
     }
 
     }
 
-    m_active = active;
+    return QModelIndex();
+}
 
 
-    if (active) {
-        activate();
-    } else {
-        deactivate();
+KFileItem DolphinColumnView::itemAt(const QPoint& point) const
+{
+    foreach (DolphinColumnWidget* column, m_columns) {
+        KFileItem item = column->itemAt(columnPosition(column, point));
+        if (!item.isNull()) {
+            return item;
+        }
     }
     }
+
+    return KFileItem();
 }
 
 }
 
-inline bool ColumnWidget::isActive() const
+void DolphinColumnView::scrollTo(const QModelIndex& index, ScrollHint hint)
 {
 {
-    return m_active;
+    activeColumn()->scrollTo(index, hint);
 }
 
 }
 
-const KUrl& ColumnWidget::url() const
+QRect DolphinColumnView::visualRect(const QModelIndex& index) const
 {
 {
-    return m_url;
+    return activeColumn()->visualRect(index);
 }
 
 }
 
-void ColumnWidget::obtainSelectionModel()
+void DolphinColumnView::invertSelection()
 {
 {
-    if (selectionModel() != m_view->selectionModel()) {
-        selectionModel()->deleteLater();
-        setSelectionModel(m_view->selectionModel());
-        clearSelection();
-    }
+    QItemSelectionModel* selectionModel = activeColumn()->selectionModel();
+    const QAbstractItemModel* itemModel = selectionModel->model();
+
+    const QModelIndex topLeft = itemModel->index(0, 0);
+    const QModelIndex bottomRight = itemModel->index(itemModel->rowCount() - 1,
+                                                     itemModel->columnCount() - 1);
+
+    const QItemSelection selection(topLeft, bottomRight);
+    selectionModel->select(selection, QItemSelectionModel::Toggle);
 }
 
 }
 
-void ColumnWidget::releaseSelectionModel()
+void DolphinColumnView::reload()
 {
 {
-    if (selectionModel() == m_view->selectionModel()) {
-        QItemSelectionModel* replacementModel = new QItemSelectionModel(model());
-        setSelectionModel(replacementModel);
+    foreach (DolphinColumnWidget* column, m_columns) {
+        column->reload();
     }
 }
 
     }
 }
 
-QStyleOptionViewItem ColumnWidget::viewOptions() const
+void DolphinColumnView::setRootUrl(const KUrl& url)
 {
 {
-    return m_viewOptions;
+    removeAllColumns();
+    m_columns[0]->setUrl(url);
 }
 
 }
 
-void ColumnWidget::dragEnterEvent(QDragEnterEvent* event)
+void DolphinColumnView::setNameFilter(const QString& nameFilter)
 {
 {
-    if (event->mimeData()->hasUrls()) {
-        event->acceptProposedAction();
+    if (nameFilter != m_nameFilter) {
+        m_nameFilter = nameFilter;
+        foreach (DolphinColumnWidget* column, m_columns) {
+            column->setNameFilter(nameFilter);
+        }
     }
     }
-
-    m_dragging = true;
 }
 
 }
 
-void ColumnWidget::dragLeaveEvent(QDragLeaveEvent* event)
+QString DolphinColumnView::nameFilter() const
 {
 {
-    QListView::dragLeaveEvent(event);
-
-    // TODO: remove this code when the issue #160611 is solved in Qt 4.4
-    m_dragging = false;
-    setDirtyRegion(m_dropRect);
+    return m_nameFilter;
 }
 
 }
 
-void ColumnWidget::dragMoveEvent(QDragMoveEvent* event)
+KUrl DolphinColumnView::rootUrl() const
 {
 {
-    QListView::dragMoveEvent(event);
-
-    // TODO: remove this code when the issue #160611 is solved in Qt 4.4
-    const QModelIndex index = indexAt(event->pos());
-    setDirtyRegion(m_dropRect);
-    m_dropRect = visualRect(index);
-    setDirtyRegion(m_dropRect);
+    return m_columns[0]->url();
 }
 
 }
 
-void ColumnWidget::dropEvent(QDropEvent* event)
+void DolphinColumnView::showColumn(const KUrl& url)
 {
 {
-    const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
-    if (!urls.isEmpty()) {
-        event->acceptProposedAction();
-        m_view->m_controller->indicateDroppedUrls(urls,
-                                                  indexAt(event->pos()),
-                                                  event->source());
+    if (!rootUrl().isParentOf(url)) {
+        setRootUrl(url);
+        return;
     }
     }
-    QListView::dropEvent(event);
-    m_dragging = false;
-}
-
-void ColumnWidget::mousePressEvent(QMouseEvent* event)
-{
-    // On each mouse press event QColumnView triggers the loading of the
-    // current folder in the next column. This is not wanted for Dolphin when
-    // opening a context menu or when the CTRL modifier is pressed. Beside usability
-    // aspects the loading of the folder also implies losing the current selection,
-    // which makes it impossible to select folders from the current column. To bypass
-    // this behavior QListView::mousePressEvent() is not invoked in those cases, which
-    // is not a nice solution. Maybe another solution can be found in future versions
-    // of QColumnView.
-
-    m_view->requestSelectionModel(this);
-
-    bool swallowMousePressEvent = false;
-    const QModelIndex index = indexAt(event->pos());
-    if (index.isValid()) {
-        // a click on an item has been done
-        const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(m_view->model());
-        const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
-        const QModelIndex dirIndex = proxyModel->mapToSource(index);
-        KFileItem item = dirModel->itemForIndex(dirIndex);
-        if (!item.isNull()) {
-            QItemSelectionModel* selModel = selectionModel();
-
-            bool activate = true;
-            const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
-            if (modifier & Qt::ControlModifier) {
-                m_view->requestActivation(this);
-                if (!selModel->hasSelection()) {
-                    // Assure to set the current index, so that a selection by the SHIFT key
-                    // will work. TODO: If the index specifies a folder, the loading of the folder will
-                    // be triggered by QColumnView although this is not wanted by Dolphin.
-                    selModel->setCurrentIndex(index, QItemSelectionModel::Select);
+
+    int columnIndex = 0;
+    foreach (DolphinColumnWidget* column, m_columns) {
+        if (column->url() == url) {
+            // the column represents already the requested URL, hence activate it
+            requestActivation(column);
+            layoutColumns();
+            return;
+        } else if (!column->url().isParentOf(url)) {
+            // the column is no parent of the requested URL, hence
+            // just delete all remaining columns
+            if (columnIndex > 0) {
+                QList<DolphinColumnWidget*>::iterator start = m_columns.begin() + columnIndex;
+                QList<DolphinColumnWidget*>::iterator end = m_columns.end();
+                for (QList<DolphinColumnWidget*>::iterator it = start; it != end; ++it) {
+                    deleteColumn(*it);
                 }
                 }
-                selModel->select(index, QItemSelectionModel::Toggle);
-                swallowMousePressEvent = true;
-            } else if (item.isDir()) {
-                m_childUrl = item.url();
-                viewport()->update();
-
-                // Only request the activation if not the left button is pressed.
-                // The left button on a directory opens a new column, hence requesting
-                // an activation is useless as the new column will request the activation
-                // afterwards.
-                if (event->button() == Qt::LeftButton) {
-                    activate = false;
+                m_columns.erase(start, end);
+
+                const int maxIndex = m_columns.count() - 1;
+                Q_ASSERT(maxIndex >= 0);
+                if (m_index > maxIndex) {
+                    m_index = maxIndex;
                 }
                 }
+                break;
             }
             }
+        }
+        ++columnIndex;
+    }
 
 
-            if (activate) {
-                m_view->requestActivation(this);
+    // Create missing columns. Assuming that the path is "/home/peter/Temp/" and
+    // the target path is "/home/peter/Temp/a/b/c/", then the columns "a", "b" and
+    // "c" will be created.
+    const int lastIndex = m_columns.count() - 1;
+    Q_ASSERT(lastIndex >= 0);
+
+    const KUrl& activeUrl = m_columns[lastIndex]->url();
+    Q_ASSERT(activeUrl.isParentOf(url));
+    Q_ASSERT(activeUrl != url);
+
+    QString path = activeUrl.url(KUrl::AddTrailingSlash);
+    const QString targetPath = url.url(KUrl::AddTrailingSlash);
+
+    columnIndex = lastIndex;
+    int slashIndex = path.count('/');
+    bool hasSubPath = (slashIndex >= 0);
+    while (hasSubPath) {
+        const QString subPath = targetPath.section('/', slashIndex, slashIndex);
+        if (subPath.isEmpty()) {
+            hasSubPath = false;
+        } else {
+            path += subPath + '/';
+            ++slashIndex;
+
+            const KUrl childUrl = KUrl(path);
+            m_columns[columnIndex]->setChildUrl(childUrl);
+            columnIndex++;
+
+            DolphinColumnWidget* column = new DolphinColumnWidget(viewport(), this, childUrl);
+            const QString filter = nameFilter();
+            if (!filter.isEmpty()) {
+                column->setNameFilter(filter);
             }
             }
+            column->setActive(false);
 
 
-            // TODO: is the assumption OK that Qt::RightButton always represents the context menu button?
-            if (event->button() == Qt::RightButton) {
-                swallowMousePressEvent = true;
-                if (!selModel->isSelected(index)) {
-                    clearSelection();
-                }
-                selModel->select(index, QItemSelectionModel::Select);
-            }
-        }
-    } else {
-        // a click on the viewport has been done
-        m_view->requestActivation(this);
+            m_columns.append(column);
 
 
-        // Swallow mouse move events if a click is done on the viewport. Otherwise the QColumnView
-        // triggers an unwanted loading of directories on hovering folder items.
-        m_swallowMouseMoveEvents = true;
-        clearSelection();
+            // Before invoking layoutColumns() the column must be set visible temporary.
+            // To prevent a flickering the initial geometry is set to a hidden position.
+            column->setGeometry(QRect(-1, -1, 1, 1));
+            column->show();
+            layoutColumns();
+            updateScrollBar();
+        }
     }
 
     }
 
-    if (!swallowMousePressEvent) {
-        QListView::mousePressEvent(event);
-    }
+    // set the last column as active column without modifying the controller
+    // and hence the history
+    activeColumn()->setActive(false);
+    m_index = columnIndex;
+    activeColumn()->setActive(true);
+    assureVisibleActiveColumn();
 }
 
 }
 
-void ColumnWidget::mouseMoveEvent(QMouseEvent* event)
+void DolphinColumnView::editItem(const KFileItem& item)
 {
 {
-    // see description in ColumnView::mousePressEvent()
-    if (!m_swallowMouseMoveEvents) {
-        QListView::mouseMoveEvent(event);
-    }
+    activeColumn()->editItem(item);
 }
 
 }
 
-void ColumnWidget::mouseReleaseEvent(QMouseEvent* event)
+KFileItemList DolphinColumnView::selectedItems() const
 {
 {
-    QListView::mouseReleaseEvent(event);
-    m_swallowMouseMoveEvents = false;
+    return activeColumn()->selectedItems();
 }
 
 }
 
-
-void ColumnWidget::paintEvent(QPaintEvent* event)
+QMimeData* DolphinColumnView::selectionMimeData() const
 {
 {
-    if (!m_childUrl.isEmpty()) {
-        // indicate the shown URL of the next column by highlighting the shown folder item
-        const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(m_view->model());
-        const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
-        const QModelIndex dirIndex = dirModel->indexForUrl(m_childUrl);
-        const QModelIndex proxyIndex = proxyModel->mapFromSource(dirIndex);
-        if (proxyIndex.isValid() && !selectionModel()->isSelected(proxyIndex)) {
-            const QRect itemRect = visualRect(proxyIndex);
-            QPainter painter(viewport());
-            painter.save();
+    return activeColumn()->selectionMimeData();
+}
 
 
-            QColor color = KColorScheme(KColorScheme::View).foreground();
-            color.setAlpha(32);
-            painter.setPen(Qt::NoPen);
-            painter.setBrush(color);
-            painter.drawRect(itemRect);
+void DolphinColumnView::selectAll()
+{
+    activeColumn()->selectAll();
+}
 
 
-            painter.restore();
-        }
-    }
+bool DolphinColumnView::isIndexHidden(const QModelIndex& index) const
+{
+    Q_UNUSED(index);
+    return false;//activeColumn()->isIndexHidden(index);
+}
 
 
-    QListView::paintEvent(event);
+QModelIndex DolphinColumnView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
+{
+    // Parts of this code have been taken from QColumnView::moveCursor().
+    // Copyright (C) 1992-2007 Trolltech ASA.
 
 
-    // TODO: remove this code when the issue #160611 is solved in Qt 4.4
-    if (m_dragging) {
-        const QBrush& brush = m_viewOptions.palette.brush(QPalette::Normal, QPalette::Highlight);
-        DolphinController::drawHoverIndication(viewport(), m_dropRect, brush);
+    Q_UNUSED(modifiers);
+    if (model() == 0) {
+        return QModelIndex();
     }
     }
-}
 
 
-void ColumnWidget::contextMenuEvent(QContextMenuEvent* event)
-{
-    if (!m_active) {
-        m_view->requestActivation(this);
+    const QModelIndex current = currentIndex();
+    if (isRightToLeft()) {
+        if (cursorAction == MoveLeft) {
+            cursorAction = MoveRight;
+        } else if (cursorAction == MoveRight) {
+            cursorAction = MoveLeft;
+        }
     }
 
     }
 
-    QListView::contextMenuEvent(event);
+    switch (cursorAction) {
+    case MoveLeft:
+        if (m_index > 0) {
+            setActiveColumnIndex(m_index - 1);
+            m_controller->triggerUrlChangeRequest(activeColumn()->url());
+        }
+        break;
+
+    case MoveRight:
+        if (m_index < m_columns.count() - 1) {
+            setActiveColumnIndex(m_index + 1);
+            m_controller->triggerUrlChangeRequest(m_columns[m_index]->url());
+        }
+        break;
 
 
-    const QModelIndex index = indexAt(event->pos());
-    if (index.isValid() || m_active) {
-        // Only open a context menu above an item or if the mouse is above
-        // the active column.
-        const QPoint pos = m_view->viewport()->mapFromGlobal(event->globalPos());
-        m_view->m_controller->triggerContextMenuRequest(pos);
+    default:
+        break;
     }
     }
+
+    return QModelIndex();
 }
 
 }
 
-void ColumnWidget::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
+void DolphinColumnView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags)
 {
 {
-    // inactive views should not have any selection
-    if (!m_active) {
-        clearSelection();
-    }
-    QListView::selectionChanged(selected, deselected);
+    Q_UNUSED(rect);
+    Q_UNUSED(flags);
 }
 
 }
 
-void ColumnWidget::activate()
+QRegion DolphinColumnView::visualRegionForSelection(const QItemSelection& selection) const
 {
 {
-    const QColor bgColor = KColorScheme(KColorScheme::View).background();
-    QPalette palette = viewport()->palette();
-    palette.setColor(viewport()->backgroundRole(), bgColor);
-    viewport()->setPalette(palette);
-
-    update();
+    Q_UNUSED(selection);
+    return QRegion();
 }
 
 }
 
-void ColumnWidget::deactivate()
+int DolphinColumnView::horizontalOffset() const
 {
 {
-    QColor bgColor = KColorScheme(KColorScheme::View).background();
-    const QColor fgColor = KColorScheme(KColorScheme::View).foreground();
-    bgColor = KColorUtils::mix(bgColor, fgColor, 0.04);
-
-    QPalette palette = viewport()->palette();
-    palette.setColor(viewport()->backgroundRole(), bgColor);
-    viewport()->setPalette(palette);
-
-    update();
+    return -m_contentX;
 }
 
 }
 
-// ---
-
-DolphinColumnView::DolphinColumnView(QWidget* parent, DolphinController* controller) :
-    QColumnView(parent),
-    m_controller(controller)
+int DolphinColumnView::verticalOffset() const
 {
 {
-    Q_ASSERT(controller != 0);
-
-    setAcceptDrops(true);
-    setDragDropMode(QAbstractItemView::DragDrop);
-    setDropIndicatorShown(false);
-    setSelectionMode(ExtendedSelection);
-
-    if (KGlobalSettings::singleClick()) {
-        connect(this, SIGNAL(clicked(const QModelIndex&)),
-                this, SLOT(triggerItem(const QModelIndex&)));
-    } else {
-        connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
-                this, SLOT(triggerItem(const QModelIndex&)));
-    }
-    connect(this, SIGNAL(entered(const QModelIndex&)),
-            controller, SLOT(emitItemEntered(const QModelIndex&)));
-    connect(this, SIGNAL(viewportEntered()),
-            controller, SLOT(emitViewportEntered()));
-    connect(controller, SIGNAL(zoomIn()),
-            this, SLOT(zoomIn()));
-    connect(controller, SIGNAL(zoomOut()),
-            this, SLOT(zoomOut()));
-    connect(controller, SIGNAL(urlChanged(const KUrl&)),
-            this, SLOT(updateColumnsState(const KUrl&)));
-
-    updateDecorationSize();
+    return 0;
 }
 
 }
 
-DolphinColumnView::~DolphinColumnView()
+void DolphinColumnView::mousePressEvent(QMouseEvent* event)
 {
 {
+    m_controller->requestActivation();
+    QAbstractItemView::mousePressEvent(event);
 }
 
 }
 
-void DolphinColumnView::invertSelection()
+void DolphinColumnView::resizeEvent(QResizeEvent* event)
 {
 {
-    selectActiveColumn(QItemSelectionModel::Toggle);
+    QAbstractItemView::resizeEvent(event);
+    layoutColumns();
+    updateScrollBar();
+    assureVisibleActiveColumn();
 }
 
 }
 
-void DolphinColumnView::selectAll()
+void DolphinColumnView::wheelEvent(QWheelEvent* event)
 {
 {
-    selectActiveColumn(QItemSelectionModel::Select);
+    // let Ctrl+wheel events propagate to the DolphinView for icon zooming
+    if ((event->modifiers() & Qt::ControlModifier) == Qt::ControlModifier) {
+        event->ignore();
+       return;
+    }
+    QAbstractItemView::wheelEvent(event);
 }
 
 }
 
-QAbstractItemView* DolphinColumnView::createColumn(const QModelIndex& index)
+void DolphinColumnView::setZoomLevel(int level)
 {
 {
-    // let the column widget be aware about its URL...
-    KUrl columnUrl;
-    if (viewport()->children().count() == 0) {
-        // For the first column widget the directory lister has not been started
-        // yet, hence use the URL from the controller instead.
-        columnUrl = m_controller->url();
-    } else {
-        const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(model());
-        const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
-
-        const QModelIndex dirModelIndex = proxyModel->mapToSource(index);
-        KFileItem fileItem = dirModel->itemForIndex(dirModelIndex);
-        if (!fileItem.isNull()) {
-            columnUrl = fileItem.url();
-        }
-    }
+    const int size = ZoomLevelInfo::iconSizeForZoomLevel(level);
+    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 
 
-    ColumnWidget* view = new ColumnWidget(viewport(), this, columnUrl);
-
-    // The following code has been copied 1:1 from QColumnView::createColumn().
-    // Copyright (C) 1992-2007 Trolltech ASA. In Qt 4.4 the new method
-    // QColumnView::initializeColumn() will be available for this.
-
-    view->setFrameShape(QFrame::NoFrame);
-    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
-    view->setMinimumWidth(100);
-    view->setAttribute(Qt::WA_MacShowFocusRect, false);
-
-    // copy the 'view' behavior
-    view->setDragDropMode(dragDropMode());
-    view->setDragDropOverwriteMode(dragDropOverwriteMode());
-    view->setDropIndicatorShown(showDropIndicator());
-    view->setAlternatingRowColors(alternatingRowColors());
-    view->setAutoScroll(hasAutoScroll());
-    view->setEditTriggers(editTriggers());
-    view->setHorizontalScrollMode(horizontalScrollMode());
-    view->setIconSize(iconSize());
-    view->setSelectionBehavior(selectionBehavior());
-    view->setSelectionMode(selectionMode());
-    view->setTabKeyNavigation(tabKeyNavigation());
-    view->setTextElideMode(textElideMode());
-    view->setVerticalScrollMode(verticalScrollMode());
-
-    view->setModel(model());
-
-    // set the delegate to be the columnview delegate
-    QAbstractItemDelegate* delegate = view->itemDelegate();
-    view->setItemDelegate(itemDelegate());
-    delete delegate;
-
-    view->setRootIndex(index);
-
-    if (model()->canFetchMore(index)) {
-        model()->fetchMore(index);
+    const bool showPreview = m_controller->dolphinView()->showPreview();
+    if (showPreview) {
+        settings->setPreviewSize(size);
+    } else {
+        settings->setIconSize(size);
     }
 
     }
 
-    return view;
+    updateDecorationSize(showPreview);
 }
 
 }
 
-void DolphinColumnView::mousePressEvent(QMouseEvent* event)
+void DolphinColumnView::moveContentHorizontally(int x)
 {
 {
-    m_controller->triggerActivation();
-    QColumnView::mousePressEvent(event);
+    m_contentX = isRightToLeft() ? +x : -x;
+    layoutColumns();
 }
 
 }
 
-void DolphinColumnView::dragEnterEvent(QDragEnterEvent* event)
+void DolphinColumnView::updateDecorationSize(bool showPreview)
 {
 {
-    if (event->mimeData()->hasUrls()) {
-        event->acceptProposedAction();
+    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
+    const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
+    const QSize size(iconSize, iconSize);
+    setIconSize(size);
+
+    foreach (QObject* object, viewport()->children()) {
+        if (object->inherits("QListView")) {
+            DolphinColumnWidget* widget = static_cast<DolphinColumnWidget*>(object);
+            widget->setDecorationSize(size);
+        }
     }
     }
+
+    doItemsLayout();
 }
 
 }
 
-void DolphinColumnView::dropEvent(QDropEvent* event)
+void DolphinColumnView::updateColumnsBackground(bool active)
 {
 {
-    const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
-    if (!urls.isEmpty()) {
-        m_controller->indicateDroppedUrls(urls,
-                                          indexAt(event->pos()),
-                                          event->source());
-        event->acceptProposedAction();
+    if (active == m_active) {
+        return;
+    }
+
+    m_active = active;
+
+    // dim the background of the viewport
+    const QPalette::ColorRole role = viewport()->backgroundRole();
+    QColor background = viewport()->palette().color(role);
+    background.setAlpha(0);  // make background transparent
+
+    QPalette palette = viewport()->palette();
+    palette.setColor(role, background);
+    viewport()->setPalette(palette);
+
+    foreach (DolphinColumnWidget* column, m_columns) {
+        column->updateBackground();
     }
     }
-    QColumnView::dropEvent(event);
 }
 
 }
 
-void DolphinColumnView::zoomIn()
+void DolphinColumnView::slotSortingChanged(DolphinView::Sorting sorting)
 {
 {
-    if (isZoomInPossible()) {
-        ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-        // TODO: get rid of K3Icon sizes
-        switch (settings->iconSize()) {
-        case K3Icon::SizeSmall:  settings->setIconSize(K3Icon::SizeMedium); break;
-        case K3Icon::SizeMedium: settings->setIconSize(K3Icon::SizeLarge); break;
-        default: Q_ASSERT(false); break;
-        }
-        updateDecorationSize();
+    foreach (DolphinColumnWidget* column, m_columns) {
+        column->setSorting(sorting);
     }
 }
 
     }
 }
 
-void DolphinColumnView::zoomOut()
+void DolphinColumnView::slotSortOrderChanged(Qt::SortOrder order)
 {
 {
-    if (isZoomOutPossible()) {
-        ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-        // TODO: get rid of K3Icon sizes
-        switch (settings->iconSize()) {
-        case K3Icon::SizeLarge:  settings->setIconSize(K3Icon::SizeMedium); break;
-        case K3Icon::SizeMedium: settings->setIconSize(K3Icon::SizeSmall); break;
-        default: Q_ASSERT(false); break;
-        }
-        updateDecorationSize();
+    foreach (DolphinColumnWidget* column, m_columns) {
+        column->setSortOrder(order);
     }
 }
 
     }
 }
 
-void DolphinColumnView::triggerItem(const QModelIndex& index)
+void DolphinColumnView::slotShowHiddenFilesChanged()
 {
 {
-    m_controller->triggerItem(index);
-    updateColumnsState(m_controller->url());
+    const bool show = m_controller->dolphinView()->showHiddenFiles();
+    foreach (DolphinColumnWidget* column, m_columns) {
+        column->setShowHiddenFiles(show);
+    }
 }
 
 }
 
-void DolphinColumnView::updateColumnsState(const KUrl& url)
+void DolphinColumnView::slotShowPreviewChanged()
 {
 {
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            widget->setActive(widget->url() == url);
-        }
+    const bool show = m_controller->dolphinView()->showPreview();
+    updateDecorationSize(show);
+    foreach (DolphinColumnWidget* column, m_columns) {
+        column->setShowPreview(show);
     }
 }
 
     }
 }
 
-
-void DolphinColumnView::updateDecorationSize()
+void DolphinColumnView::setActiveColumnIndex(int index)
 {
 {
-    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    const int iconSize = settings->iconSize();
+    if (m_index == index) {
+        return;
+    }
 
 
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            widget->setDecorationSize(QSize(iconSize, iconSize));
-        }
+    const bool hasActiveColumn = (m_index >= 0);
+    if (hasActiveColumn) {
+        m_columns[m_index]->setActive(false);
     }
 
     }
 
-    m_controller->setZoomInPossible(isZoomInPossible());
-    m_controller->setZoomOutPossible(isZoomOutPossible());
+    m_index = index;
+    m_columns[m_index]->setActive(true);
 
 
-    doItemsLayout();
+    assureVisibleActiveColumn();
 }
 
 }
 
-bool DolphinColumnView::isZoomInPossible() const
+void DolphinColumnView::layoutColumns()
 {
 {
+    const int gap = 4;
+
     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    return settings->iconSize() < K3Icon::SizeLarge;
+    const int columnWidth = settings->columnWidth();
+
+    QRect emptyViewportRect;
+    if (isRightToLeft()) {
+        int x = viewport()->width() - columnWidth + m_contentX;
+        foreach (DolphinColumnWidget* column, m_columns) {
+            column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
+            x -= columnWidth;
+        }
+        emptyViewportRect = QRect(0, 0, x + columnWidth - gap, viewport()->height());
+    } else {
+        int x = m_contentX;
+        foreach (DolphinColumnWidget* column, m_columns) {
+            column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
+            x += columnWidth;
+        }
+        emptyViewportRect = QRect(x, 0, viewport()->width() - x - gap, viewport()->height());
+    }
+
+    if (emptyViewportRect.isValid()) {
+        m_emptyViewport->show();
+        m_emptyViewport->setGeometry(emptyViewportRect);
+    } else {
+        m_emptyViewport->hide();
+    }
 }
 
 }
 
-bool DolphinColumnView::isZoomOutPossible() const
+void DolphinColumnView::updateScrollBar()
 {
     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 {
     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    return settings->iconSize() > K3Icon::SizeSmall;
+    const int contentWidth = m_columns.count() * settings->columnWidth();
+
+    horizontalScrollBar()->setPageStep(contentWidth);
+    horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 }
 
 }
 
-void DolphinColumnView::requestActivation(QWidget* column)
+void DolphinColumnView::assureVisibleActiveColumn()
 {
 {
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            const bool isActive = (widget == column);
-            widget->setActive(isActive);
-            if (isActive) {
-               m_controller->setUrl(widget->url());
-            }
+    const int viewportWidth = viewport()->width();
+    const int x = activeColumn()->x();
+
+    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
+    const int width = settings->columnWidth();
+
+    if (x + width > viewportWidth) {
+        const int newContentX = m_contentX - x - width + viewportWidth;
+        if (isRightToLeft()) {
+            m_animation->setFrameRange(m_contentX, newContentX);
+        } else {
+            m_animation->setFrameRange(-m_contentX, -newContentX);
+        }
+        if (m_animation->state() != QTimeLine::Running) {
+           m_animation->start();
+        }
+    } else if (x < 0) {
+        const int newContentX = m_contentX - x;
+        if (isRightToLeft()) {
+            m_animation->setFrameRange(m_contentX, newContentX);
+        } else {
+            m_animation->setFrameRange(-m_contentX, -newContentX);
+        }
+        if (m_animation->state() != QTimeLine::Running) {
+           m_animation->start();
         }
     }
 }
 
         }
     }
 }
 
-void DolphinColumnView::requestSelectionModel(QAbstractItemView* view)
+void DolphinColumnView::requestActivation(DolphinColumnWidget* column)
 {
 {
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            if (widget == view) {
-                widget->obtainSelectionModel();
-            } else {
-                widget->releaseSelectionModel();
+    m_controller->setItemView(column);
+    if (column->isActive()) {
+        assureVisibleActiveColumn();
+    } else {
+        int index = 0;
+        foreach (DolphinColumnWidget* currColumn, m_columns) {
+            if (currColumn == column) {
+                setActiveColumnIndex(index);
+                return;
             }
             }
+            ++index;
         }
     }
 }
 
         }
     }
 }
 
-void DolphinColumnView::selectActiveColumn(QItemSelectionModel::SelectionFlags flags)
+void DolphinColumnView::removeAllColumns()
 {
 {
-    // TODO: this approach of selecting the active column is very slow. It should be
-    // possible to speedup the implementation by using QItemSelection, but all adempts
-    // have failed yet...
-
-    // assure that the selection model of the active column is set properly, otherwise
-    // no visual update of the selections is done
-    const KUrl& activeUrl = m_controller->url();
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            if (widget->url() == activeUrl) {
-                widget->obtainSelectionModel();
-            } else {
-                widget->releaseSelectionModel();
-            }
-        }
+    QList<DolphinColumnWidget*>::iterator start = m_columns.begin() + 1;
+    QList<DolphinColumnWidget*>::iterator end = m_columns.end();
+    for (QList<DolphinColumnWidget*>::iterator it = start; it != end; ++it) {
+        deleteColumn(*it);
     }
     }
+    m_columns.erase(start, end);
+    m_index = 0;
+    m_columns[0]->setActive(true);
+    assureVisibleActiveColumn();
+}
 
 
-    QItemSelectionModel* selModel = selectionModel();
-
-    const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(model());
-    const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
-    KDirLister* dirLister = dirModel->dirLister();
+QPoint DolphinColumnView::columnPosition(DolphinColumnWidget* column, const QPoint& point) const
+{
+    const QPoint topLeft = column->frameGeometry().topLeft();
+    return QPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
+}
 
 
-    const KFileItemList list = dirLister->itemsForDir(activeUrl);
-    foreach (KFileItem* item, list) {
-        const QModelIndex index = dirModel->indexForUrl(item->url());
-        selModel->select(proxyModel->mapFromSource(index), flags);
+void DolphinColumnView::deleteColumn(DolphinColumnWidget* column)
+{
+    if (column != 0) {
+        if (m_controller->itemView() == column) {
+            m_controller->setItemView(0);
+        }
+        // deleteWhenNotDragSource(column) does not necessarily delete column,
+        // and we want its preview generator destroyed immediately.
+        column->m_previewGenerator->deleteLater();
+        column->m_previewGenerator = 0;
+        column->hide();
+        // Prevent automatic destruction of column when this DolphinColumnView 
+        // is destroyed.
+        column->setParent(0); 
+        column->disconnect();
+        emit requestColumnDeletion(column);
     }
 }
 
     }
 }