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+/***************************************************************************
+ * Copyright (C) 2008 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 DOLPHINVIEWAUTOSCROLLER_H
+#define DOLPHINVIEWAUTOSCROLLER_H
+
+#include <QTime>
+#include <QObject>
+
+class QAbstractItemView;
+class QModelIndex;
+class QTimer;
+
+/**
+ * @brief Assures that an autoscrolling is done for item views.
+ *
+ * This is a workaround as QAbstractItemView::setAutoScroll() is not usable
+ * when selecting items (see Qt issue #214542).
+ */
+class DolphinViewAutoScroller : public QObject
+{
+ Q_OBJECT
+
+public:
+ DolphinViewAutoScroller(QAbstractItemView* parent);
+ virtual ~DolphinViewAutoScroller();
+ bool isActive() const;
+
+ /**
+ * Must be invoked by the parent item view, when QAbstractItemView::currentChanged()
+ * has been called. Assures that the current item stays visible when it has been
+ * changed by the keyboard.
+ */
+ void handleCurrentIndexChange(const QModelIndex& current, const QModelIndex& previous);
+
+protected:
+ virtual bool eventFilter(QObject* watched, QEvent* event);
+
+private slots:
+ void scrollViewport();
+
+private:
+ void triggerAutoScroll();
+ void stopAutoScroll();
+
+ /**
+ * Calculates the scroll increment dependent from
+ * the cursor position \a cursorPos and the range 0 - \a rangeSize - 1.
+ */
+ int calculateScrollIncrement(int cursorPos, int rangeSize) const;
+
+private:
+ bool m_rubberBandSelection;
+ bool m_keyPressed;
+ bool m_initializedTimestamp;
+ int m_horizontalScrollInc;
+ int m_verticalScrollInc;
+ QAbstractItemView* m_itemView;
+ QTimer* m_timer;
+ QTime m_timestamp;
+};
+
+#endif