Add GroupModel and corresponding unit test.

src/gui/GroupModel.cpp

@@ -0,0 +1,120 @@
+/*
+ *  Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
+ *
+ *  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 or (at your option)
+ *  version 3 of the License.
+ *
+ *  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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "GroupModel.h"
+
+#include "core/Group.h"
+
+GroupModel::GroupModel(const Group* rootGroup, QObject* parent) : QAbstractItemModel(parent)
+{
+    m_root = rootGroup;
+}
+
+void GroupModel::setRootGroup(const Group* group)
+{
+    m_root = group;
+}
+
+int GroupModel::rowCount(const QModelIndex& parent) const
+{
+    if (!parent.isValid()) {
+        return 1;
+    }
+    else {
+        const Group* group = groupFromIndex(parent);
+        return group->children().size();
+    }
+}
+
+int GroupModel::columnCount(const QModelIndex& parent) const
+{
+    Q_UNUSED(parent);
+
+    return 1;
+}
+
+QModelIndex GroupModel::index(int row, int column, const QModelIndex& parent) const
+{
+    if (!hasIndex(row, column, parent)) {
+        return QModelIndex();
+    }
+
+    const Group* group;
+
+    if (!parent.isValid()) {
+        group = m_root;
+    }
+    else {
+        group = groupFromIndex(parent)->children().at(row);
+    }
+
+    return createIndex(row, column, group);
+}
+
+QModelIndex GroupModel::parent(const QModelIndex& index) const
+{
+    if (!index.isValid()) {
+        return QModelIndex();
+    }
+
+    const Group* childGroup = groupFromIndex(index);
+    const Group* parentGroup = childGroup->parentGroup();
+
+    if (!parentGroup) {
+        return QModelIndex();
+    }
+    else {
+        const Group* grandParentGroup = parentGroup->parentGroup();
+        if (!grandParentGroup) {
+            return createIndex(0, 0, parentGroup);
+        }
+        else {
+            return createIndex(grandParentGroup->children().indexOf(parentGroup), 0, parentGroup);
+        }
+    }
+}
+
+QVariant GroupModel::data(const QModelIndex& index, int role) const
+{
+    if (!index.isValid() || role != Qt::DisplayRole) {
+        return QVariant();
+    }
+
+    const Group* group = groupFromIndex(index);
+    return group->name();
+}
+
+QVariant GroupModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    Q_UNUSED(section);
+    Q_UNUSED(orientation);
+    Q_UNUSED(role);
+
+    return QVariant();
+}
+
+QModelIndex GroupModel::createIndex(int row, int column, const Group* group) const
+{
+    return QAbstractItemModel::createIndex(row, column, const_cast<Group*>(group));
+}
+
+const Group* GroupModel::groupFromIndex(const QModelIndex& index) const
+{
+    Q_ASSERT(index.internalPointer());
+
+    return static_cast<const Group*>(index.internalPointer());
+}