Move KItemRange to its own header

Also factor out the code that transforms a sorted list of ints to a
KItemRangeList. This removes some duplicated code from KFileItemModel.

Note that overriding operator<<() in KItemRangeList was necessary
because it's not a typedef for QList<KItemRange>, but a class derived
from that now, and some code fails to compile if the return type of
that function is QList<KItemRange> and not KItemRangeList.

REVIEW: 112728

1 files changed, 98 insertions, 0 deletions

diff --git a/src/kitemviews/kitemrange.h b/src/kitemviews/kitemrange.h
new file mode 100644
index 000000000..70927b915
--- /dev/null
+++ b/src/kitemviews/kitemrange.h
@@ -0,0 +1,98 @@
+/***************************************************************************
+ *   Copyright (C) 2011 by Peter Penz <[email protected]>             *
+ *   Copyright (C) 2013 by Frank Reininghaus <[email protected]>    *
+ *                                                                         *
+ *   Based on the Itemviews NG project from Trolltech Labs:                *
+ *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
+ *                                                                         *
+ *   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 KITEMRANGE_H
+#define KITEMRANGE_H
+
+#include <QList>
+
+struct KItemRange
+{
+    KItemRange(int index = 0, int count = 0);
+    int index;
+    int count;
+
+    bool operator == (const KItemRange& other) const;
+};
+
+inline KItemRange::KItemRange(int index, int count) :
+    index(index),
+    count(count)
+{
+}
+
+inline bool KItemRange::operator == (const KItemRange& other) const
+{
+    return index == other.index && count == other.count;
+}
+
+
+class KItemRangeList : public QList<KItemRange>
+{
+public:
+    KItemRangeList() : QList<KItemRange>() {}
+    KItemRangeList(const QList<KItemRange>& list) : QList<KItemRange>(list) {}
+
+    template<class Container>
+    static KItemRangeList fromSortedContainer(const Container& container);
+
+    KItemRangeList& operator<<(const KItemRange& range)
+    {
+        append(range);
+        return *this;
+    }
+};
+
+template<class Container>
+KItemRangeList KItemRangeList::fromSortedContainer(const Container& container)
+{
+    typename Container::const_iterator it = container.constBegin();
+    const typename Container::const_iterator end = container.constEnd();
+
+    if (it == end) {
+        return KItemRangeList();
+    }
+
+    KItemRangeList result;
+
+    int index = *it;
+    int count = 1;
+
+    ++it;
+
+    while (it != end) {
+        if (*it == index + count) {
+            ++count;
+        } else {
+            result << KItemRange(index, count);
+            index = *it;
+            count = 1;
+        }
+        ++it;
+    }
+
+    result << KItemRange(index, count);
+    return result;
+}
+
+#endif