Refactored DolphinColumnWidget so that it does not need a hierarchical KDirLister. This simplifies the code a lot and also bypasses the current problems with the KDirLister cache when working on hierarchical directories in parallel. There are some minor regressions which will be fixed, but all in all some improvements are visible already:

- the loading of columns is a lot faster
- preview in columns is working
- no side effects in combination with the treeview-panel because of caching

svn path=/trunk/KDE/kdebase/apps/; revision=721678

1 files changed, 177 insertions, 0 deletions

diff --git a/src/dolphincolumnwidget.h b/src/dolphincolumnwidget.h
new file mode 100644
index 000000000..0efce0902
--- /dev/null
+++ b/src/dolphincolumnwidget.h
@@ -0,0 +1,177 @@
+/***************************************************************************
+ *   Copyright (C) 2007 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   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  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef DOLPHINCOLUMNWIDGET_H
+#define DOLPHINCOLUMNWIDGET_H
+
+#include <QListView>
+#include <QStyleOption>
+
+#include <kurl.h>
+
+class DolphinColumnView;
+class DolphinModel;
+class DolphinSortFilterProxyModel;
+class KDirLister;
+class KFileItem;
+class KFileItemList;
+class QPixmap;
+
+/**
+ * Represents one column inside the DolphinColumnView and has been
+ * extended to respect view options and hovering information.
+ */
+class DolphinColumnWidget : public QListView
+{
+    Q_OBJECT
+
+public:
+    DolphinColumnWidget(QWidget* parent,
+                        DolphinColumnView* columnView,
+                        const KUrl& url);
+    virtual ~DolphinColumnWidget();
+
+    /** 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);
+    bool isActive() const;
+
+    /**
+     * Sets the directory URL of the child column that is shown next to
+     * this column. This property is only used for a visual indication
+     * of the shown directory, it does not trigger a loading of the model.
+     */
+    void setChildUrl(const KUrl& url);
+    const KUrl& childUrl() const;
+
+    /** Sets the directory URL that is shown inside the column widget. */
+    void setUrl(const KUrl& url);
+
+    /** Returns the directory URL that is shown inside the column widget. */
+    const KUrl& url() const;
+
+    /** Reloads the directory DolphinColumnWidget::url(). */
+    void reload();
+
+    void setShowHiddenFiles(bool show);
+    void setShowPreview(bool show);
+
+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 paintEvent(QPaintEvent* event);
+    virtual void mousePressEvent(QMouseEvent* event);
+    virtual void keyPressEvent(QKeyEvent* event);
+    virtual void contextMenuEvent(QContextMenuEvent* event);
+    virtual void selectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
+
+private slots:
+    /**
+     * If the item specified by \a index is a directory, then this
+     * directory will be loaded in a new column. If the  item is a
+     * file, the corresponding application will get started.
+     */
+    void triggerItem(const QModelIndex& index);
+
+    /**
+     * Generates a preview image for each file item in \a items.
+     * The current preview settings (maximum size, 'Show Preview' menu)
+     * are respected.
+     */
+    void generatePreviews(const KFileItemList& items);
+
+    /**
+     * Replaces the icon of the item \a item by the preview pixmap
+     * \a pixmap.
+     */
+    void showPreview(const KFileItem& item, const QPixmap& pixmap);
+
+    void slotEntered(const QModelIndex& index);
+
+private:
+    /** Used by DolphinColumnWidget::setActive(). */
+    void activate();
+
+    /** Used by DolphinColumnWidget::setActive(). */
+    void deactivate();
+
+    /**
+     * Returns true, if the item \a item has been cut into
+     * the clipboard.
+     */
+    bool isCutItem(const KFileItem& item) const;
+
+private:
+    bool m_active;
+    bool m_showPreview;
+    DolphinColumnView* m_view;
+    KUrl m_url;      // URL of the directory that is shown
+    KUrl m_childUrl; // URL of the next column that is shown
+    QStyleOptionViewItem m_viewOptions;
+    KDirLister* m_dirLister;
+    DolphinModel* m_dolphinModel;
+    DolphinSortFilterProxyModel* m_proxyModel;
+
+    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
+};
+
+inline bool DolphinColumnWidget::isActive() const
+{
+    return m_active;
+}
+
+inline void DolphinColumnWidget::setChildUrl(const KUrl& url)
+{
+    m_childUrl = url;
+}
+
+inline const KUrl& DolphinColumnWidget::childUrl() const
+{
+    return m_childUrl;
+}
+
+inline void DolphinColumnWidget::setUrl(const KUrl& url)
+{
+    if (url != m_url) {
+        m_url = url;
+        reload();
+    }
+}
+
+inline const KUrl& DolphinColumnWidget::url() const
+{
+    return m_url;
+}
+
+inline QStyleOptionViewItem DolphinColumnWidget::viewOptions() const
+{
+    return m_viewOptions;
+}
+
+#endif