]> cloud.milkyroute.net Git - dolphin.git/blobdiff - src/dolphincolumnview.cpp
Fix slot name.
[dolphin.git] / src / dolphincolumnview.cpp
index e4669442ccc231519181581a4d8d0bba1c8a0f3a..2d3bcb826d7165a5bfb4160151a0c518d496e1bb 100644 (file)
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2007 by Peter Penz <peter.penz@gmx.at>                  *
+ *   Copyright (C) 2007-2009 by Peter Penz <peter.penz@gmx.at>             *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
 
 #include "dolphincolumnview.h"
 
+#include "dolphinmodel.h"
+#include "dolphincolumnviewcontainer.h"
 #include "dolphincontroller.h"
-#include "dolphinsettings.h"
-
+#include "dolphindirlister.h"
+#include "dolphinsortfilterproxymodel.h"
+#include "settings/dolphinsettings.h"
+#include "dolphinviewautoscroller.h"
 #include "dolphin_columnmodesettings.h"
+#include "dolphin_generalsettings.h"
+#include "draganddrophelper.h"
+#include "folderexpander.h"
+#include "tooltips/tooltipmanager.h"
+#include "versioncontrolobserver.h"
+#include "viewextensionsfactory.h"
+#include "zoomlevelinfo.h"
 
-#include <kcolorutils.h>
 #include <kcolorscheme.h>
 #include <kdirlister.h>
-#include <kdirmodel.h>
+#include <kfileitem.h>
+#include <kio/previewjob.h>
+#include <kiconeffect.h>
+#include <kjob.h>
+#include <konqmimedata.h>
 
-#include <QAbstractProxyModel>
 #include <QApplication>
+#include <QClipboard>
+#include <QPainter>
 #include <QPoint>
+#include <QScrollBar>
 
-/*
- * 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) :
+DolphinColumnView::DolphinColumnView(QWidget* parent,
+                                     DolphinColumnViewContainer* container,
+                                     const KUrl& url) :
     QListView(parent),
-    m_active(true),
-    m_swallowMouseMoveEvents(false),
-    m_view(columnView),
+    m_active(false),
+    m_container(container),
+    m_extensionsFactory(0),
     m_url(url),
     m_childUrl(),
-    m_dragging(false),
+    m_font(),
+    m_decorationSize(),
+    m_dirLister(0),
+    m_dolphinModel(0),
+    m_proxyModel(0),
     m_dropRect()
 {
     setMouseTracking(true);
-    viewport()->setAttribute(Qt::WA_Hover);
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    setSelectionBehavior(SelectItems);
+    setSelectionMode(QAbstractItemView::ExtendedSelection);
+    setDragDropMode(QAbstractItemView::DragDrop);
+    setDropIndicatorShown(false);
+    setSelectionRectVisible(true);
+    setEditTriggers(QAbstractItemView::NoEditTriggers);
+
+    setVerticalScrollMode(QListView::ScrollPerPixel);
+    setHorizontalScrollMode(QListView::ScrollPerPixel);
 
     // apply the column mode settings to the widget
     const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
     Q_ASSERT(settings != 0);
 
-    m_viewOptions = QListView::viewOptions();
+    if (settings->useSystemFont()) {
+        m_font = KGlobalSettings::generalFont();
+    } else {
+        m_font = QFont(settings->fontFamily(),
+                       settings->fontSize(),
+                       settings->fontWeight(),
+                       settings->italicFont());
+    }
 
-    QFont font(settings->fontFamily(), settings->fontSize());
-    font.setItalic(settings->italicFont());
-    font.setBold(settings->boldFont());
-    m_viewOptions.font = font;
+    activate();
 
-    const int iconSize = settings->iconSize();
-    m_viewOptions.decorationSize = QSize(iconSize, iconSize);
+    connect(this, SIGNAL(viewportEntered()),
+            m_container->m_controller, SLOT(emitViewportEntered()));
+    connect(this, SIGNAL(entered(const QModelIndex&)),
+            this, SLOT(slotEntered(const QModelIndex&)));
 
-    activate();
-}
+    const DolphinView* dolphinView = m_container->m_controller->dolphinView();
+    connect(dolphinView, SIGNAL(showPreviewChanged()),
+            this, SLOT(slotShowPreviewChanged()));
 
-ColumnWidget::~ColumnWidget()
-{
+    m_dirLister = new DolphinDirLister();
+    m_dirLister->setAutoUpdate(true);
+    m_dirLister->setMainWindow(window());
+    m_dirLister->setDelayedMimeTypes(true);
+    const bool showHiddenFiles = m_container->m_controller->dolphinView()->showHiddenFiles();
+    m_dirLister->setShowingDotFiles(showHiddenFiles);
+
+    m_dolphinModel = new DolphinModel(this);
+    m_dolphinModel->setDirLister(m_dirLister);
+    m_dolphinModel->setDropsAllowed(DolphinModel::DropOnDirectory);
+
+    m_proxyModel = new DolphinSortFilterProxyModel(this);
+    m_proxyModel->setSourceModel(m_dolphinModel);
+    m_proxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
+
+    m_proxyModel->setSorting(dolphinView->sorting());
+    m_proxyModel->setSortOrder(dolphinView->sortOrder());
+    m_proxyModel->setSortFoldersFirst(dolphinView->sortFoldersFirst());
+
+    setModel(m_proxyModel);
+
+    connect(KGlobalSettings::self(), SIGNAL(kdisplayFontChanged()),
+            this, SLOT(updateFont()));
+
+    /*FolderExpander* folderExpander = new FolderExpander(this, m_proxyModel);
+    folderExpander->setEnabled(DolphinSettings::instance().generalSettings()->autoExpandFolders());
+    connect (folderExpander, SIGNAL(enterDir(const QModelIndex&)),
+             m_container->m_controller, SLOT(triggerItem(const QModelIndex&)));
+
+    new VersionControlObserver(this);*/
+
+    DolphinController* controller = m_container->m_controller;
+    connect(controller, SIGNAL(zoomLevelChanged(int)),
+            this, SLOT(setZoomLevel(int)));
+
+    const QString nameFilter = controller->nameFilter();
+    if (!nameFilter.isEmpty()) {
+        m_proxyModel->setFilterRegExp(nameFilter);
+    }
+
+    updateDecorationSize(dolphinView->showPreview());
+    m_extensionsFactory = new ViewExtensionsFactory(this, controller);
 }
 
-void ColumnWidget::setDecorationSize(const QSize& size)
+DolphinColumnView::~DolphinColumnView()
 {
-    m_viewOptions.decorationSize = size;
-    doItemsLayout();
+    delete m_proxyModel;
+    m_proxyModel = 0;
+    delete m_dolphinModel;
+    m_dolphinModel = 0;
+    m_dirLister = 0; // deleted by m_dolphinModel
 }
 
-void ColumnWidget::setActive(bool active)
+void DolphinColumnView::setActive(bool active)
 {
-    if (active) {
-        obtainSelectionModel();
-    } else {
-        releaseSelectionModel();
+    if (active && (m_container->focusProxy() != this)) {
+        m_container->setFocusProxy(this);
     }
 
-    if (m_active == active) {
-        return;
-    }
+    if (m_active != active) {
+        m_active = active;
 
-    m_active = active;
-
-    if (active) {
-        activate();
-    } else {
-        deactivate();
+        if (active) {
+            activate();
+        } else {
+            deactivate();
+        }
     }
 }
 
-inline bool ColumnWidget::isActive() const
+void DolphinColumnView::updateBackground()
 {
-    return m_active;
-}
+    // TODO: The alpha-value 150 is copied from DolphinView::setActive(). When
+    // cleaning up the cut-indication of DolphinColumnView with the code from
+    // DolphinView a common helper-class should be available which can be shared
+    // by all view implementations -> no hardcoded value anymore
+    const QPalette::ColorRole role = viewport()->backgroundRole();
+    QColor color = viewport()->palette().color(role);
+    color.setAlpha((m_active && m_container->m_active) ? 255 : 150);
 
-const KUrl& ColumnWidget::url() const
-{
-    return m_url;
+    QPalette palette = viewport()->palette();
+    palette.setColor(role, color);
+    viewport()->setPalette(palette);
+
+    update();
 }
 
-void ColumnWidget::obtainSelectionModel()
+KFileItem DolphinColumnView::itemAt(const QPoint& pos) const
 {
-    if (selectionModel() != m_view->selectionModel()) {
-        selectionModel()->deleteLater();
-        setSelectionModel(m_view->selectionModel());
-        clearSelection();
+    KFileItem item;
+    const QModelIndex index = indexAt(pos);
+    if (index.isValid() && (index.column() == DolphinModel::Name)) {
+        const QModelIndex dolphinModelIndex = m_proxyModel->mapToSource(index);
+        item = m_dolphinModel->itemForIndex(dolphinModelIndex);
     }
+    return item;
 }
 
-void ColumnWidget::releaseSelectionModel()
+QStyleOptionViewItem DolphinColumnView::viewOptions() const
 {
-    if (selectionModel() == m_view->selectionModel()) {
-        QItemSelectionModel* replacementModel = new QItemSelectionModel(model());
-        setSelectionModel(replacementModel);
-    }
+    QStyleOptionViewItem viewOptions = QListView::viewOptions();
+    viewOptions.font = m_font;
+    viewOptions.decorationSize = m_decorationSize;
+    viewOptions.showDecorationSelected = true;
+    return viewOptions;
 }
 
-QStyleOptionViewItem ColumnWidget::viewOptions() const
+void DolphinColumnView::startDrag(Qt::DropActions supportedActions)
 {
-    return m_viewOptions;
+    DragAndDropHelper::instance().startDrag(this, supportedActions, m_container->m_controller);
 }
 
-void ColumnWidget::dragEnterEvent(QDragEnterEvent* event)
+void DolphinColumnView::dragEnterEvent(QDragEnterEvent* event)
 {
-    if (event->mimeData()->hasUrls()) {
+    if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
         event->acceptProposedAction();
+        requestActivation();
     }
-
-    m_dragging = true;
 }
 
-void ColumnWidget::dragLeaveEvent(QDragLeaveEvent* event)
+void DolphinColumnView::dragLeaveEvent(QDragLeaveEvent* event)
 {
     QListView::dragLeaveEvent(event);
-
-    // TODO: remove this code when the issue #160611 is solved in Qt 4.4
-    m_dragging = false;
     setDirtyRegion(m_dropRect);
 }
 
-void ColumnWidget::dragMoveEvent(QDragMoveEvent* event)
+void DolphinColumnView::dragMoveEvent(QDragMoveEvent* event)
 {
     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);
-}
-
-void ColumnWidget::dropEvent(QDropEvent* event)
-{
-    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());
-    }
-    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());
+    m_dropRect.setSize(QSize()); // set as invalid
     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);
-                }
-                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;
-                }
-            }
-
-            if (activate) {
-                m_view->requestActivation(this);
-            }
-
-            // 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);
-            }
+        m_container->m_controller->setItemView(this);
+        const KFileItem item = m_container->m_controller->itemForIndex(index);
+        if (!item.isNull() && item.isDir()) {
+            m_dropRect = visualRect(index);
         }
-    } else {
-        // a click on the viewport has been done
-        m_view->requestActivation(this);
-
-        // 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();
-    }
-
-    if (!swallowMousePressEvent) {
-        QListView::mousePressEvent(event);
     }
-}
+    setDirtyRegion(m_dropRect);
 
-void ColumnWidget::mouseMoveEvent(QMouseEvent* event)
-{
-    // see description in ColumnView::mousePressEvent()
-    if (!m_swallowMouseMoveEvents) {
-        QListView::mouseMoveEvent(event);
+    if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
+        // accept url drops, independently from the destination item
+        event->acceptProposedAction();
     }
 }
 
-void ColumnWidget::mouseReleaseEvent(QMouseEvent* event)
+void DolphinColumnView::dropEvent(QDropEvent* event)
 {
-    QListView::mouseReleaseEvent(event);
-    m_swallowMouseMoveEvents = false;
+    const QModelIndex index = indexAt(event->pos());
+    m_container->m_controller->setItemView(this);
+    const KFileItem item = m_container->m_controller->itemForIndex(index);
+    m_container->m_controller->indicateDroppedUrls(item, url(), event);
+    QListView::dropEvent(event);
 }
 
-
-void ColumnWidget::paintEvent(QPaintEvent* event)
+void DolphinColumnView::paintEvent(QPaintEvent* event)
 {
     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);
+        const QModelIndex dirIndex = m_dolphinModel->indexForUrl(m_childUrl);
+        const QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
         if (proxyIndex.isValid() && !selectionModel()->isSelected(proxyIndex)) {
             const QRect itemRect = visualRect(proxyIndex);
             QPainter painter(viewport());
-            painter.save();
-
-            QColor color = KColorScheme(KColorScheme::View).foreground();
+            QColor color = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
             color.setAlpha(32);
             painter.setPen(Qt::NoPen);
             painter.setBrush(color);
             painter.drawRect(itemRect);
-
-            painter.restore();
         }
     }
 
     QListView::paintEvent(event);
+}
 
-    // 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);
+void DolphinColumnView::mousePressEvent(QMouseEvent* event)
+{
+    requestActivation();
+    if (!indexAt(event->pos()).isValid()) {
+        if (QApplication::mouseButtons() & Qt::MidButton) {
+            m_container->m_controller->replaceUrlByClipboard();
+        }
+    } else if (event->button() == Qt::LeftButton) {
+        // TODO: see comment in DolphinIconsView::mousePressEvent()
+        setState(QAbstractItemView::DraggingState);
     }
+    QListView::mousePressEvent(event);
 }
 
-void ColumnWidget::contextMenuEvent(QContextMenuEvent* event)
+void DolphinColumnView::keyPressEvent(QKeyEvent* event)
 {
-    if (!m_active) {
-        m_view->requestActivation(this);
+    QListView::keyPressEvent(event);
+    requestActivation();
+
+    DolphinController* controller = m_container->m_controller;
+    controller->handleKeyPressEvent(event);
+    switch (event->key()) {
+    case Qt::Key_Right: {
+        // Special key handling for the column: A Key_Right should
+        // open a new column for the currently selected folder.
+        const QModelIndex index = currentIndex();
+        const KFileItem item = controller->itemForIndex(index);
+        if (!item.isNull() && item.isDir()) {
+            controller->emitItemTriggered(item);
+        }
+        break;
     }
 
-    QListView::contextMenuEvent(event);
+    case Qt::Key_Escape:
+        selectionModel()->setCurrentIndex(selectionModel()->currentIndex(),
+                                          QItemSelectionModel::Current |
+                                          QItemSelectionModel::Clear);
+        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;
     }
 }
 
-void ColumnWidget::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
+void DolphinColumnView::contextMenuEvent(QContextMenuEvent* event)
 {
-    // inactive views should not have any selection
     if (!m_active) {
-        clearSelection();
+        m_container->requestActivation(this);
+        Q_ASSERT(m_container->m_controller->itemView() == this);
+        m_container->m_controller->triggerUrlChangeRequest(m_url);
     }
-    QListView::selectionChanged(selected, deselected);
-}
-
-void ColumnWidget::activate()
-{
-    const QColor bgColor = KColorScheme(KColorScheme::View).background();
-    QPalette palette = viewport()->palette();
-    palette.setColor(viewport()->backgroundRole(), bgColor);
-    viewport()->setPalette(palette);
+    Q_ASSERT(m_active);
 
-    update();
+    QListView::contextMenuEvent(event);
+    m_container->m_controller->triggerContextMenuRequest(event->pos());
 }
 
-void ColumnWidget::deactivate()
+void DolphinColumnView::wheelEvent(QWheelEvent* event)
 {
-    QColor bgColor = KColorScheme(KColorScheme::View).background();
-    const QColor fgColor = KColorScheme(KColorScheme::View).foreground();
-    bgColor = KColorUtils::mix(bgColor, fgColor, 0.04);
+    // let Ctrl+wheel events propagate to the DolphinView for icon zooming
+    if (event->modifiers() & Qt::ControlModifier) {
+        event->ignore();
+        return;
+    }
 
-    QPalette palette = viewport()->palette();
-    palette.setColor(viewport()->backgroundRole(), bgColor);
-    viewport()->setPalette(palette);
+    const int height = m_decorationSize.height();
+    const int step = (height >= KIconLoader::SizeHuge) ? height / 10 : (KIconLoader::SizeHuge - height) / 2;
+    verticalScrollBar()->setSingleStep(step);
 
-    update();
+    QListView::wheelEvent(event);
 }
 
-// ---
-
-DolphinColumnView::DolphinColumnView(QWidget* parent, DolphinController* controller) :
-    QColumnView(parent),
-    m_controller(controller)
+void DolphinColumnView::leaveEvent(QEvent* event)
 {
-    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();
+    QListView::leaveEvent(event);
+    // if the mouse is above an item and moved very fast outside the widget,
+    // no viewportEntered() signal might be emitted although the mouse has been moved
+    // above the viewport
+    m_container->m_controller->emitViewportEntered();
 }
 
-DolphinColumnView::~DolphinColumnView()
+void DolphinColumnView::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
 {
-}
+    QListView::selectionChanged(selected, deselected);
 
-void DolphinColumnView::invertSelection()
-{
-    selectActiveColumn(QItemSelectionModel::Toggle);
+    //QItemSelectionModel* selModel = m_container->selectionModel();
+    //selModel->select(selected, QItemSelectionModel::Select);
+    //selModel->select(deselected, QItemSelectionModel::Deselect);
 }
 
-void DolphinColumnView::selectAll()
+void DolphinColumnView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
 {
-    selectActiveColumn(QItemSelectionModel::Select);
+    QListView::currentChanged(current, previous);
+    m_extensionsFactory->handleCurrentIndexChange(current, previous);
 }
 
-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_container->m_controller->dolphinView()->showPreview();
+    if (showPreview) {
+        settings->setPreviewSize(size);
+    } else {
+        settings->setIconSize(size);
     }
 
-    return view;
+    updateDecorationSize(showPreview);
 }
 
-void DolphinColumnView::mousePressEvent(QMouseEvent* event)
+void DolphinColumnView::slotEntered(const QModelIndex& index)
 {
-    m_controller->triggerActivation();
-    QColumnView::mousePressEvent(event);
+    m_container->m_controller->setItemView(this);
+    m_container->m_controller->emitItemEntered(index);
 }
 
-void DolphinColumnView::dragEnterEvent(QDragEnterEvent* event)
+void DolphinColumnView::requestActivation()
 {
-    if (event->mimeData()->hasUrls()) {
-        event->acceptProposedAction();
+    m_container->m_controller->setItemView(this);
+    m_container->m_controller->requestActivation();
+    if (!m_active) {
+        m_container->requestActivation(this);
+        m_container->m_controller->triggerUrlChangeRequest(m_url);
+        selectionModel()->clear();
     }
 }
 
-void DolphinColumnView::dropEvent(QDropEvent* event)
+void DolphinColumnView::updateFont()
 {
-    const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
-    if (!urls.isEmpty()) {
-        m_controller->indicateDroppedUrls(urls,
-                                          indexAt(event->pos()),
-                                          event->source());
-        event->acceptProposedAction();
-    }
-    QColumnView::dropEvent(event);
-}
+    const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
+    Q_ASSERT(settings != 0);
 
-void DolphinColumnView::zoomIn()
-{
-    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();
+    if (settings->useSystemFont()) {
+        m_font = KGlobalSettings::generalFont();
     }
 }
 
-void DolphinColumnView::zoomOut()
+void DolphinColumnView::slotShowPreviewChanged()
 {
-    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();
-    }
+    const DolphinView* view = m_container->m_controller->dolphinView();
+    updateDecorationSize(view->showPreview());
 }
 
-void DolphinColumnView::triggerItem(const QModelIndex& index)
+void DolphinColumnView::activate()
 {
-    m_controller->triggerItem(index);
-    updateColumnsState(m_controller->url());
-}
+    setFocus(Qt::OtherFocusReason);
 
-void DolphinColumnView::updateColumnsState(const KUrl& url)
-{
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            widget->setActive(widget->url() == url);
-        }
+    if (KGlobalSettings::singleClick()) {
+        connect(this, SIGNAL(clicked(const QModelIndex&)),
+                m_container->m_controller, SLOT(triggerItem(const QModelIndex&)));
+    } else {
+        connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
+                m_container->m_controller, SLOT(triggerItem(const QModelIndex&)));
     }
-}
-
-
-void DolphinColumnView::updateDecorationSize()
-{
-    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    const int iconSize = settings->iconSize();
 
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            widget->setDecorationSize(QSize(iconSize, iconSize));
-        }
+    if (selectionModel() && selectionModel()->currentIndex().isValid()) {
+        selectionModel()->setCurrentIndex(selectionModel()->currentIndex(), QItemSelectionModel::SelectCurrent);
     }
 
-    m_controller->setZoomInPossible(isZoomInPossible());
-    m_controller->setZoomOutPossible(isZoomOutPossible());
-
-    doItemsLayout();
-}
-
-bool DolphinColumnView::isZoomInPossible() const
-{
-    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    return settings->iconSize() < K3Icon::SizeLarge;
-}
-
-bool DolphinColumnView::isZoomOutPossible() const
-{
-    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
-    return settings->iconSize() > K3Icon::SizeSmall;
+    updateBackground();
 }
 
-void DolphinColumnView::requestActivation(QWidget* column)
+void DolphinColumnView::deactivate()
 {
-    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());
-            }
-        }
+    clearFocus();
+    if (KGlobalSettings::singleClick()) {
+        disconnect(this, SIGNAL(clicked(const QModelIndex&)),
+                   m_container->m_controller, SLOT(triggerItem(const QModelIndex&)));
+    } else {
+        disconnect(this, SIGNAL(doubleClicked(const QModelIndex&)),
+                   m_container->m_controller, SLOT(triggerItem(const QModelIndex&)));
     }
-}
 
-void DolphinColumnView::requestSelectionModel(QAbstractItemView* view)
-{
-    foreach (QObject* object, viewport()->children()) {
-        if (object->inherits("QListView")) {
-            ColumnWidget* widget = static_cast<ColumnWidget*>(object);
-            if (widget == view) {
-                widget->obtainSelectionModel();
-            } else {
-                widget->releaseSelectionModel();
-            }
-        }
-    }
+    const QModelIndex current = selectionModel()->currentIndex();
+    selectionModel()->clear();
+    selectionModel()->setCurrentIndex(current, QItemSelectionModel::NoUpdate);
+    updateBackground();
 }
 
-void DolphinColumnView::selectActiveColumn(QItemSelectionModel::SelectionFlags flags)
+void DolphinColumnView::updateDecorationSize(bool showPreview)
 {
-    // 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();
-            }
-        }
-    }
-
-    QItemSelectionModel* selModel = selectionModel();
+    ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
+    const int iconSize = showPreview ? settings->previewSize() : settings->iconSize();
+    const QSize size(iconSize, iconSize);
+    setIconSize(size);
 
-    const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(model());
-    const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
-    KDirLister* dirLister = dirModel->dirLister();
+    m_decorationSize = size;
 
-    const KFileItemList list = dirLister->itemsForDir(activeUrl);
-    foreach (KFileItem* item, list) {
-        const QModelIndex index = dirModel->indexForUrl(item->url());
-        selModel->select(proxyModel->mapFromSource(index), flags);
-    }
+    doItemsLayout();
 }
 
 #include "dolphincolumnview.moc"