Merged very early alpha-version of Dolphin 2.0

Dolphin 2.0 will get a new view-engine with the
following improvements:
- Better performance
- Animated transitions
- No clipped filenames due to dynamic item-sizes
- Grouping support for all view-modes
- Non-rectangular selection areas
- Simplified code for better maintenance

More details will be provided in a blog-entry during
the next days.

Please note that the code is in a very
early alpha-stage and although the most tricky parts
have been implemented already very basic things like
drag and drop or selections have not been pushed yet.
Those things are rather trivial to implement but this
still will take some time.

1 files changed, 126 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistviewlayouter_p.h b/src/kitemviews/kitemlistviewlayouter_p.h
new file mode 100644
index 000000000..775e9ff85
--- /dev/null
+++ b/src/kitemviews/kitemlistviewlayouter_p.h
@@ -0,0 +1,126 @@
+/***************************************************************************
+ *   Copyright (C) 2011 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 KITEMLISTVIEWLAYOUTER_H
+#define KITEMLISTVIEWLAYOUTER_H
+
+#include <libdolphin_export.h>
+
+#include <QObject>
+#include <QRectF>
+#include <QSet>
+#include <QSizeF>
+
+class KItemModelBase;
+class KItemListSizeHintResolver;
+
+class LIBDOLPHINPRIVATE_EXPORT KItemListViewLayouter : public QObject
+{
+    Q_OBJECT
+
+public:
+    KItemListViewLayouter(QObject* parent = 0);
+    virtual ~KItemListViewLayouter();
+
+    void setScrollOrientation(Qt::Orientation orientation);
+    Qt::Orientation scrollOrientation() const;
+
+    void setSize(const QSizeF& size);
+    QSizeF size() const;
+
+    void setItemSize(const QSizeF& size);
+    QSizeF itemSize() const;
+
+    // TODO: add note that offset can be < 0 or > maximumOffset!
+    void setOffset(qreal offset);
+    qreal offset() const;
+
+    void setModel(const KItemModelBase* model);
+    const KItemModelBase* model() const;
+
+    void setSizeHintResolver(const KItemListSizeHintResolver* sizeHintResolver);
+    const KItemListSizeHintResolver* sizeHintResolver() const;
+
+    qreal maximumOffset() const;
+
+    // TODO: mention that return value is -1 if count == 0
+    int firstVisibleIndex() const;
+
+    // TODO: mention that return value is -1 if count == 0
+    int lastVisibleIndex() const;
+
+    QRectF itemBoundingRect(int index) const;
+
+    int maximumVisibleItems() const;
+
+    /**
+     * @return True if the item with the index \p itemIndex
+     *         is the first item within a group.
+     */
+    bool isFirstGroupItem(int itemIndex) const;
+
+    void markAsDirty();
+
+private:
+    void doLayout();
+
+    void updateVisibleIndexes();
+    void updateGroupedVisibleIndexes();
+    void createGroupHeaders();
+
+private:
+    bool m_dirty;
+    bool m_visibleIndexesDirty;
+    bool m_grouped;
+
+    Qt::Orientation m_scrollOrientation;
+    QSizeF m_size;
+
+    QSizeF m_itemSize;
+    const KItemModelBase* m_model;
+    const KItemListSizeHintResolver* m_sizeHintResolver;
+
+    qreal m_offset;
+    qreal m_maximumOffset;
+
+    int m_firstVisibleIndex;
+    int m_lastVisibleIndex;
+
+    int m_firstVisibleGroupIndex;
+
+    qreal m_columnWidth;
+    qreal m_xPosInc;
+    int m_columnCount;
+
+    struct ItemGroup {
+        int firstItemIndex;
+        qreal y;
+    };
+    QList<ItemGroup> m_groups;
+
+    // Stores all item indexes that are the first item of a group.
+    // Assures fast access for KItemListViewLayouter::isFirstGroupItem().
+    QSet<int> m_groupIndexes;
+
+    QList<QRectF> m_itemBoundingRects;
+};
+
+#endif
+
+