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* Use Nepomuk for getting the meta data instead of KFileMetaInfo.
[dolphin.git] / src / dolphiniconsview.cpp
diff --git a/src/dolphiniconsview.cpp b/src/dolphiniconsview.cpp
index d21ffba32752ebfd42b8257a7a5aab67125dcd78..f5b69bade49cb6e9e7cb7830543ec88d97048987 100644 (file)
--- a/src/dolphiniconsview.cpp
+++ b/src/dolphiniconsview.cpp
@@ -19,29 +19,53 @@
 
 #include "dolphiniconsview.h"
 
 
 #include "dolphiniconsview.h"
 
+#include "dolphincategorydrawer.h"
 #include "dolphincontroller.h"
 #include "dolphincontroller.h"
-#include "dolphinsettings.h"
-#include "dolphinitemcategorizer.h"
-
+#include "settings/dolphinsettings.h"
+#include "dolphinviewautoscroller.h"
 #include "dolphin_iconsmodesettings.h"
 #include "dolphin_iconsmodesettings.h"
+#include "dolphin_generalsettings.h"
+#include "draganddrophelper.h"
+#include "selectionmanager.h"
+#include "zoomlevelinfo.h"
+
+#include <kcategorizedsortfilterproxymodel.h>
+#include <kdialog.h>
+#include <kdirmodel.h>
+#include <kfileitemdelegate.h>
 
 #include <QAbstractProxyModel>
 #include <QApplication>
 
 #include <QAbstractProxyModel>
 #include <QApplication>
-#include <QPainter>
-#include <QPoint>
+#include <QScrollBar>
 
 DolphinIconsView::DolphinIconsView(QWidget* parent, DolphinController* controller) :
 
 DolphinIconsView::DolphinIconsView(QWidget* parent, DolphinController* controller) :
-    KListView(parent),
+    KCategorizedView(parent),
+    m_enableScrollTo(false),
     m_controller(controller),
     m_controller(controller),
-    m_dragging(false)
+    m_selectionManager(0),
+    m_autoScroller(0),
+    m_categoryDrawer(0),
+    m_font(),
+    m_decorationSize(),
+    m_decorationPosition(QStyleOptionViewItem::Top),
+    m_displayAlignment(Qt::AlignHCenter),
+    m_itemSize(),
+    m_dropRect()
 {
     Q_ASSERT(controller != 0);
 {
     Q_ASSERT(controller != 0);
+    setLayoutDirection(Qt::LeftToRight);
     setViewMode(QListView::IconMode);
     setResizeMode(QListView::Adjust);
     setViewMode(QListView::IconMode);
     setResizeMode(QListView::Adjust);
+    setMovement(QListView::Static);
+    setDragEnabled(true);
+    setEditTriggers(QAbstractItemView::NoEditTriggers);
+    viewport()->setAcceptDrops(true);
 
     setMouseTracking(true);
 
     setMouseTracking(true);
-    viewport()->setAttribute(Qt::WA_Hover);
+    m_autoScroller = new DolphinViewAutoScroller(this);
 
 
+    connect(this, SIGNAL(clicked(const QModelIndex&)),
+            controller, SLOT(requestTab(const QModelIndex&)));
     if (KGlobalSettings::singleClick()) {
         connect(this, SIGNAL(clicked(const QModelIndex&)),
                 controller, SLOT(triggerItem(const QModelIndex&)));
     if (KGlobalSettings::singleClick()) {
         connect(this, SIGNAL(clicked(const QModelIndex&)),
                 controller, SLOT(triggerItem(const QModelIndex&)));
@@ -49,248 +73,324 @@ DolphinIconsView::DolphinIconsView(QWidget* parent, DolphinController* controlle
         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
                 controller, SLOT(triggerItem(const QModelIndex&)));
     }
         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
                 controller, SLOT(triggerItem(const QModelIndex&)));
     }
-    connect(this, SIGNAL(activated(const QModelIndex&)),
-            controller, SLOT(triggerItem(const QModelIndex&)));
+
+    if (DolphinSettings::instance().generalSettings()->showSelectionToggle()) {
+        m_selectionManager = new SelectionManager(this);
+        connect(m_selectionManager, SIGNAL(selectionChanged()),
+                this, SLOT(requestActivation()));
+        connect(m_controller, SIGNAL(urlChanged(const KUrl&)),
+                m_selectionManager, SLOT(reset()));
+    }
+
     connect(this, SIGNAL(entered(const QModelIndex&)),
             controller, SLOT(emitItemEntered(const QModelIndex&)));
     connect(this, SIGNAL(viewportEntered()),
             controller, SLOT(emitViewportEntered()));
     connect(this, SIGNAL(entered(const QModelIndex&)),
             controller, SLOT(emitItemEntered(const QModelIndex&)));
     connect(this, SIGNAL(viewportEntered()),
             controller, SLOT(emitViewportEntered()));
-    connect(controller, SIGNAL(showPreviewChanged(bool)),
-            this, SLOT(slotShowPreviewChanged(bool)));
-    connect(controller, SIGNAL(showAdditionalInfoChanged(bool)),
-            this, SLOT(slotShowAdditionalInfoChanged(bool)));
-    connect(controller, SIGNAL(zoomIn()),
-            this, SLOT(zoomIn()));
-    connect(controller, SIGNAL(zoomOut()),
-            this, SLOT(zoomOut()));
+    connect(controller, SIGNAL(zoomLevelChanged(int)),
+            this, SLOT(setZoomLevel(int)));
+
+    const DolphinView* view = controller->dolphinView();
+    connect(view, SIGNAL(showPreviewChanged()),
+            this, SLOT(slotShowPreviewChanged()));
+    connect(view, SIGNAL(additionalInfoChanged()),
+            this, SLOT(slotAdditionalInfoChanged()));
 
     // apply the icons mode settings to the widget
     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
     Q_ASSERT(settings != 0);
 
 
     // apply the icons mode settings to the widget
     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
     Q_ASSERT(settings != 0);
 
-    m_viewOptions = KListView::viewOptions();
-    m_viewOptions.showDecorationSelected = true;
-
-    QFont font(settings->fontFamily(), settings->fontSize());
-    font.setItalic(settings->italicFont());
-    font.setBold(settings->boldFont());
-    m_viewOptions.font = font;
+    if (settings->useSystemFont()) {
+        m_font = KGlobalSettings::generalFont();
+    } else {
+        m_font = QFont(settings->fontFamily(),
+                       settings->fontSize(),
+                       settings->fontWeight(),
+                       settings->italicFont());
+    }
 
     setWordWrap(settings->numberOfTextlines() > 1);
 
     setWordWrap(settings->numberOfTextlines() > 1);
-    updateGridSize(controller->showPreview(), controller->showAdditionalInfo());
+    updateGridSize(view->showPreview(), 0);
 
     if (settings->arrangement() == QListView::TopToBottom) {
         setFlow(QListView::LeftToRight);
 
     if (settings->arrangement() == QListView::TopToBottom) {
         setFlow(QListView::LeftToRight);
-        m_viewOptions.decorationPosition = QStyleOptionViewItem::Top;
+        m_decorationPosition = QStyleOptionViewItem::Top;
+        m_displayAlignment = Qt::AlignHCenter;
     } else {
         setFlow(QListView::TopToBottom);
     } else {
         setFlow(QListView::TopToBottom);
-        m_viewOptions.decorationPosition = QStyleOptionViewItem::Left;
-        m_viewOptions.displayAlignment = Qt::AlignLeft | Qt::AlignVCenter;
+        m_decorationPosition = QStyleOptionViewItem::Left;
+        m_displayAlignment = Qt::AlignLeft | Qt::AlignVCenter;
     }
     }
+
+    m_categoryDrawer = new DolphinCategoryDrawer();
+    setCategoryDrawer(m_categoryDrawer);
+
+    setFocus();
+
+    connect(KGlobalSettings::self(), SIGNAL(settingsChanged(int)),
+            this, SLOT(slotGlobalSettingsChanged(int)));
 }
 
 DolphinIconsView::~DolphinIconsView()
 {
 }
 
 DolphinIconsView::~DolphinIconsView()
 {
+    delete m_categoryDrawer;
+    m_categoryDrawer = 0;
+}
+
+void DolphinIconsView::scrollTo(const QModelIndex& index, ScrollHint hint)
+{
+    // Enable the QListView implementation of scrollTo() only if it has been
+    // triggered by a key press. Otherwise QAbstractItemView wants to scroll to the current
+    // index each time the layout has been changed. This becomes an issue when
+    // previews are loaded and the scrollbar is used: the scrollbar will always
+    // be reset to 0 on each new preview.
+    if (m_enableScrollTo || (state() != QAbstractItemView::NoState)) {
+        KCategorizedView::scrollTo(index, hint);
+        m_enableScrollTo = false;
+    }
+}
+
+void DolphinIconsView::dataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight)
+{
+    KCategorizedView::dataChanged(topLeft, bottomRight);
+
+    KCategorizedSortFilterProxyModel* proxyModel = dynamic_cast<KCategorizedSortFilterProxyModel*>(model());
+    if (!proxyModel->isCategorizedModel()) {
+        // bypass a QListView issue that items are not layout correctly if the decoration size of
+        // an index changes
+        scheduleDelayedItemsLayout();
+    }
 }
 
 QStyleOptionViewItem DolphinIconsView::viewOptions() const
 {
 }
 
 QStyleOptionViewItem DolphinIconsView::viewOptions() const
 {
-    return m_viewOptions;
+    QStyleOptionViewItem viewOptions = KCategorizedView::viewOptions();
+    viewOptions.font = m_font;
+    viewOptions.decorationPosition = m_decorationPosition;
+    viewOptions.decorationSize = m_decorationSize;
+    viewOptions.displayAlignment = m_displayAlignment;
+    viewOptions.showDecorationSelected = true;
+    return viewOptions;
 }
 
 void DolphinIconsView::contextMenuEvent(QContextMenuEvent* event)
 {
 }
 
 void DolphinIconsView::contextMenuEvent(QContextMenuEvent* event)
 {
-    KListView::contextMenuEvent(event);
+    KCategorizedView::contextMenuEvent(event);
     m_controller->triggerContextMenuRequest(event->pos());
 }
 
 void DolphinIconsView::mousePressEvent(QMouseEvent* event)
 {
     m_controller->triggerContextMenuRequest(event->pos());
 }
 
 void DolphinIconsView::mousePressEvent(QMouseEvent* event)
 {
-    m_controller->triggerActivation();
-    if (!indexAt(event->pos()).isValid()) {
+    m_controller->requestActivation();
+    const QModelIndex index = indexAt(event->pos());
+    if (index.isValid() && (event->button() == Qt::LeftButton)) {
+        // TODO: It should not be necessary to manually set the dragging state, but I could
+        // not reproduce this issue with a Qt-only example yet to find the root cause.
+        // Issue description: start Dolphin, split the view and drag an item from the
+        // inactive view to the active view by a very fast mouse movement. Result:
+        // the item gets selected instead of being dragged...
+        setState(QAbstractItemView::DraggingState);
+    }
+
+    if (!index.isValid()) {
+        if (QApplication::mouseButtons() & Qt::MidButton) {
+            m_controller->replaceUrlByClipboard();
+        }
         const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
         if (!(modifier & Qt::ShiftModifier) && !(modifier & Qt::ControlModifier)) {
             clearSelection();
         }
     }
 
         const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
         if (!(modifier & Qt::ShiftModifier) && !(modifier & Qt::ControlModifier)) {
             clearSelection();
         }
     }
 
-    KListView::mousePressEvent(event);
+    KCategorizedView::mousePressEvent(event);
+}
+
+void DolphinIconsView::startDrag(Qt::DropActions supportedActions)
+{
+    // TODO: invoking KCategorizedView::startDrag() should not be necessary, we'll
+    // fix this in KDE 4.1
+    KCategorizedView::startDrag(supportedActions);
+    DragAndDropHelper::instance().startDrag(this, supportedActions, m_controller);
 }
 
 void DolphinIconsView::dragEnterEvent(QDragEnterEvent* event)
 {
 }
 
 void DolphinIconsView::dragEnterEvent(QDragEnterEvent* event)
 {
-    if (event->mimeData()->hasUrls()) {
+    if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
         event->acceptProposedAction();
     }
         event->acceptProposedAction();
     }
-    m_dragging = true;
 }
 
 void DolphinIconsView::dragLeaveEvent(QDragLeaveEvent* event)
 {
 }
 
 void DolphinIconsView::dragLeaveEvent(QDragLeaveEvent* event)
 {
-    KListView::dragLeaveEvent(event);
-
-    // TODO: remove this code when the issue #160611 is solved in Qt 4.4
-    m_dragging = false;
+    KCategorizedView::dragLeaveEvent(event);
     setDirtyRegion(m_dropRect);
 }
 
 void DolphinIconsView::dragMoveEvent(QDragMoveEvent* event)
 {
     setDirtyRegion(m_dropRect);
 }
 
 void DolphinIconsView::dragMoveEvent(QDragMoveEvent* event)
 {
-    KListView::dragMoveEvent(event);
+    KCategorizedView::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);
 
     // 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 DolphinIconsView::dropEvent(QDropEvent* event)
-{
-    const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
-    if (!urls.isEmpty()) {
-        m_controller->indicateDroppedUrls(urls,
-                                          indexAt(event->pos()),
-                                          event->source());
+    m_dropRect.setSize(QSize()); // set as invalid
+    if (index.isValid()) {
+        const KFileItem item = m_controller->itemForIndex(index);
+        if (!item.isNull() && item.isDir()) {
+            m_dropRect = visualRect(index);
+        } else {
+            m_dropRect.setSize(QSize()); // set as invalid
+        }
+    }
+    if (DragAndDropHelper::instance().isMimeDataSupported(event->mimeData())) {
+        // accept url drops, independently from the destination item
         event->acceptProposedAction();
     }
         event->acceptProposedAction();
     }
-    KListView::dropEvent(event);
-    m_dragging = false;
-}
 
 
-void DolphinIconsView::paintEvent(QPaintEvent* event)
-{
-    KListView::paintEvent(event);
-
-    if (m_dragging) {
-        // TODO: remove this code when the issue #160611 is solved in Qt 4.4
-        QPainter painter(viewport());
-        painter.save();
-        QBrush brush(m_viewOptions.palette.brush(QPalette::Normal, QPalette::Highlight));
-        QColor color = brush.color();
-        color.setAlpha(64);
-        brush.setColor(color);
-        painter.fillRect(m_dropRect, brush);
-        painter.restore();
-    }
+    setDirtyRegion(m_dropRect);
 }
 
 }
 
-void DolphinIconsView::slotShowPreviewChanged(bool showPreview)
+void DolphinIconsView::dropEvent(QDropEvent* event)
 {
 {
-    updateGridSize(showPreview, m_controller->showAdditionalInfo());
+    const QModelIndex index = indexAt(event->pos());
+    const KFileItem item = m_controller->itemForIndex(index);
+    m_controller->indicateDroppedUrls(item, m_controller->url(), event);
+
+    KCategorizedView::dropEvent(event);
 }
 
 }
 
-void DolphinIconsView::slotShowAdditionalInfoChanged(bool showAdditionalInfo)
+void DolphinIconsView::keyPressEvent(QKeyEvent* event)
 {
 {
-    updateGridSize(m_controller->showPreview(), showAdditionalInfo);
+    m_enableScrollTo = true; // see DolphinIconsView::scrollTo()
+    KCategorizedView::keyPressEvent(event);
+    m_controller->handleKeyPressEvent(event);
 }
 
 }
 
-void DolphinIconsView::zoomIn()
+void DolphinIconsView::wheelEvent(QWheelEvent* event)
 {
 {
-    if (isZoomInPossible()) {
-        IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
-
-        const int oldIconSize = settings->iconSize();
-        int newIconSize = oldIconSize;
+    if (m_selectionManager != 0) {
+        m_selectionManager->reset();
+    }
 
 
-        const bool showPreview = m_controller->showPreview();
-        if (showPreview) {
-            const int previewSize = increasedIconSize(settings->previewSize());
-            settings->setPreviewSize(previewSize);
-        } else {
-            newIconSize = increasedIconSize(oldIconSize);
-            settings->setIconSize(newIconSize);
-            if (settings->previewSize() < newIconSize) {
-                // assure that the preview size is always >= the icon size
-                settings->setPreviewSize(newIconSize);
-            }
-        }
+    // let Ctrl+wheel events propagate to the DolphinView for icon zooming
+    if (event->modifiers() & Qt::ControlModifier) {
+        event->ignore();
+        return;
+    }
 
 
-        // increase also the grid size
-        const int diff = newIconSize - oldIconSize;
-        settings->setItemWidth(settings->itemWidth() + diff);
-        settings->setItemHeight(settings->itemHeight() + diff);
+    horizontalScrollBar()->setSingleStep(m_itemSize.width() / 10);
+    verticalScrollBar()->setSingleStep(m_itemSize.height() / 10);
 
 
-        updateGridSize(showPreview, m_controller->showAdditionalInfo());
+    KCategorizedView::wheelEvent(event);
+    // if the icons are aligned left to right, the vertical wheel event should
+    // be applied to the horizontal scrollbar
+    const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+    const bool scrollHorizontal = (event->orientation() == Qt::Vertical) &&
+                                  (settings->arrangement() == QListView::LeftToRight);
+    if (scrollHorizontal) {
+        QWheelEvent horizEvent(event->pos(),
+                               event->delta(),
+                               event->buttons(),
+                               event->modifiers(),
+                               Qt::Horizontal);
+        QApplication::sendEvent(horizontalScrollBar(), &horizEvent);
     }
 }
 
     }
 }
 
-void DolphinIconsView::zoomOut()
+void DolphinIconsView::showEvent(QShowEvent* event)
 {
 {
-    if (isZoomOutPossible()) {
-        IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
-
-        const int oldIconSize = settings->iconSize();
-        int newIconSize = oldIconSize;
-
-        const bool showPreview = m_controller->showPreview();
-        if (showPreview) {
-            const int previewSize = decreasedIconSize(settings->previewSize());
-            settings->setPreviewSize(previewSize);
-            if (settings->iconSize() > previewSize) {
-                // assure that the icon size is always <= the preview size
-                newIconSize = previewSize;
-                settings->setIconSize(newIconSize);
-            }
-        } else {
-            newIconSize = decreasedIconSize(settings->iconSize());
-            settings->setIconSize(newIconSize);
-        }
+    KFileItemDelegate* delegate = dynamic_cast<KFileItemDelegate*>(itemDelegate());
+    delegate->setMaximumSize(m_itemSize);
 
 
-        // decrease also the grid size
-        const int diff = oldIconSize - newIconSize;
-        settings->setItemWidth(settings->itemWidth() - diff);
-        settings->setItemHeight(settings->itemHeight() - diff);
+    KCategorizedView::showEvent(event);
+}
+
+void DolphinIconsView::leaveEvent(QEvent* event)
+{
+    KCategorizedView::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_controller->emitViewportEntered();
+}
 
 
-        updateGridSize(showPreview, m_controller->showAdditionalInfo());
+void DolphinIconsView::currentChanged(const QModelIndex& current, const QModelIndex& previous)
+{
+    KCategorizedView::currentChanged(current, previous);
+    if (current.isValid() && !m_autoScroller->isActive()) {
+        scrollTo(current);
     }
 }
 
     }
 }
 
-bool DolphinIconsView::isZoomInPossible() const
+void DolphinIconsView::resizeEvent(QResizeEvent* event)
 {
 {
-    IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
-    const int size = m_controller->showPreview() ? settings->previewSize() : settings->iconSize();
-    return size < K3Icon::SizeEnormous;
+    KCategorizedView::resizeEvent(event);
+    const DolphinView* view = m_controller->dolphinView();
+    updateGridSize(view->showPreview(), view->additionalInfo().count());
 }
 
 }
 
-bool DolphinIconsView::isZoomOutPossible() const
+void DolphinIconsView::slotShowPreviewChanged()
 {
 {
-    IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
-    const int size = m_controller->showPreview() ? settings->previewSize() : settings->iconSize();
-    return size > K3Icon::SizeSmall;
+    const DolphinView* view = m_controller->dolphinView();
+    updateGridSize(view->showPreview(), additionalInfoCount());
+}
+
+void DolphinIconsView::slotAdditionalInfoChanged()
+{
+    const DolphinView* view = m_controller->dolphinView();
+    const bool showPreview = view->showPreview();
+    updateGridSize(showPreview, view->additionalInfo().count());
 }
 
 }
 
-int DolphinIconsView::increasedIconSize(int size) const
+void DolphinIconsView::setZoomLevel(int level)
 {
 {
-    // TODO: get rid of K3Icon sizes
-    int incSize = 0;
-    switch (size) {
-    case K3Icon::SizeSmall:       incSize = K3Icon::SizeSmallMedium; break;
-    case K3Icon::SizeSmallMedium: incSize = K3Icon::SizeMedium; break;
-    case K3Icon::SizeMedium:      incSize = K3Icon::SizeLarge; break;
-    case K3Icon::SizeLarge:       incSize = K3Icon::SizeHuge; break;
-    case K3Icon::SizeHuge:        incSize = K3Icon::SizeEnormous; break;
-    default: Q_ASSERT(false); break;
+    IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+
+    const int oldIconSize = settings->iconSize();
+    int newIconSize = oldIconSize;
+
+    const bool showPreview = m_controller->dolphinView()->showPreview();
+    if (showPreview) {
+        const int previewSize = ZoomLevelInfo::iconSizeForZoomLevel(level);
+        settings->setPreviewSize(previewSize);
+    } else {
+        newIconSize = ZoomLevelInfo::iconSizeForZoomLevel(level);
+        settings->setIconSize(newIconSize);
     }
     }
-    return incSize;
+
+    // increase also the grid size
+    const int diff = newIconSize - oldIconSize;
+    settings->setItemWidth(settings->itemWidth() + diff);
+    settings->setItemHeight(settings->itemHeight() + diff);
+
+    updateGridSize(showPreview, additionalInfoCount());
 }
 
 }
 
-int DolphinIconsView::decreasedIconSize(int size) const
+void DolphinIconsView::requestActivation()
 {
 {
-    // TODO: get rid of K3Icon sizes
-    int decSize = 0;
-    switch (size) {
-    case K3Icon::SizeSmallMedium: decSize = K3Icon::SizeSmall; break;
-    case K3Icon::SizeMedium: decSize = K3Icon::SizeSmallMedium; break;
-    case K3Icon::SizeLarge: decSize = K3Icon::SizeMedium; break;
-    case K3Icon::SizeHuge: decSize = K3Icon::SizeLarge; break;
-    case K3Icon::SizeEnormous: decSize = K3Icon::SizeHuge; break;
-    default: Q_ASSERT(false); break;
+    m_controller->requestActivation();
+}
+
+void DolphinIconsView::slotGlobalSettingsChanged(int category)
+{
+    Q_UNUSED(category);
+
+    const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+    Q_ASSERT(settings != 0);
+    if (settings->useSystemFont()) {
+        m_font = KGlobalSettings::generalFont();
+    }
+
+    disconnect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
+    disconnect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
+    if (KGlobalSettings::singleClick()) {
+        connect(this, SIGNAL(clicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
+    } else {
+        connect(this, SIGNAL(doubleClicked(QModelIndex)), m_controller, SLOT(triggerItem(QModelIndex)));
     }
     }
-    return decSize;
 }
 
 }
 
-void DolphinIconsView::updateGridSize(bool showPreview, bool showAdditionalInfo)
+void DolphinIconsView::updateGridSize(bool showPreview, int additionalInfoCount)
 {
     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
     Q_ASSERT(settings != 0);
 {
     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
     Q_ASSERT(settings != 0);
@@ -302,31 +402,71 @@ void DolphinIconsView::updateGridSize(bool showPreview, bool showAdditionalInfo)
     if (showPreview) {
         const int previewSize = settings->previewSize();
         const int diff = previewSize - size;
     if (showPreview) {
         const int previewSize = settings->previewSize();
         const int diff = previewSize - size;
-        Q_ASSERT(diff >= 0);
         itemWidth  += diff;
         itemHeight += diff;
 
         size = previewSize;
     }
 
         itemWidth  += diff;
         itemHeight += diff;
 
         size = previewSize;
     }
 
-    if (showAdditionalInfo) {
-        itemHeight += m_viewOptions.font.pointSize() * 2;
+    Q_ASSERT(additionalInfoCount >= 0);
+    itemHeight += additionalInfoCount * m_font.pointSize() * 2;
+
+    // Optimize the item size of the grid in a way to prevent large gaps on the
+    // right border (= row arrangement) or the bottom border (= column arrangement).
+    // There is no public API in QListView to find out the used width of the viewport
+    // for the layout. The following calculation of 'contentWidth'/'contentHeight'
+    // is based on QListViewPrivate::prepareItemsLayout() (Copyright (C) 2009 Nokia Corporation).
+    int frameAroundContents = 0;
+    if (style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents)) {
+        frameAroundContents = style()->pixelMetric(QStyle::PM_DefaultFrameWidth) * 2;
     }
     }
-
+    const int spacing = settings->gridSpacing();
     if (settings->arrangement() == QListView::TopToBottom) {
     if (settings->arrangement() == QListView::TopToBottom) {
+        const int contentWidth = viewport()->width() - 1
+                                 - frameAroundContents
+                                 - style()->pixelMetric(QStyle::PM_ScrollBarExtent, 0, horizontalScrollBar());
+        const int gridWidth = itemWidth + spacing * 2;
+        const int horizItemCount = contentWidth / gridWidth;
+        if (horizItemCount > 0) {
+            itemWidth += (contentWidth - horizItemCount * gridWidth) / horizItemCount;
+        }
+
         // The decoration width indirectly defines the maximum
         // width for the text wrapping. To use the maximum item width
         // for text wrapping, it is used as decoration width.
         // The decoration width indirectly defines the maximum
         // width for the text wrapping. To use the maximum item width
         // for text wrapping, it is used as decoration width.
-        m_viewOptions.decorationSize = QSize(itemWidth, size);
+        m_decorationSize = QSize(itemWidth, size);
+        setIconSize(QSize(itemWidth, size));
     } else {
     } else {
-        m_viewOptions.decorationSize = QSize(size, size);
+        const int contentHeight = viewport()->height() - 1
+                                  - frameAroundContents
+                                  - style()->pixelMetric(QStyle::PM_ScrollBarExtent, 0, verticalScrollBar());
+        const int gridHeight = itemHeight + spacing;
+        const int vertItemCount = contentHeight / gridHeight;
+        if (vertItemCount > 0) {
+            itemHeight += (contentHeight - vertItemCount * gridHeight) / vertItemCount;
+        }
+
+        m_decorationSize = QSize(size, size);
+        setIconSize(QSize(size, size));
     }
 
     }
 
-    const int spacing = settings->gridSpacing();
-    setGridSize(QSize(itemWidth + spacing, itemHeight + spacing));
+    m_itemSize = QSize(itemWidth, itemHeight);
+    setGridSize(QSize(itemWidth + spacing * 2, itemHeight + spacing));
 
 
-    m_controller->setZoomInPossible(isZoomInPossible());
-    m_controller->setZoomOutPossible(isZoomOutPossible());
+    KFileItemDelegate* delegate = dynamic_cast<KFileItemDelegate*>(itemDelegate());
+    if (delegate != 0) {
+        delegate->setMaximumSize(m_itemSize);
+    }
+
+    if (m_selectionManager != 0) {
+        m_selectionManager->reset();
+    }
+}
+
+int DolphinIconsView::additionalInfoCount() const
+{
+    const DolphinView* view = m_controller->dolphinView();
+    return view->additionalInfo().count();
 }
 
 #include "dolphiniconsview.moc"
 }
 
 #include "dolphiniconsview.moc"