/* Function: MergeGroupInto
* Adds the members of a group to the end of a group in another list. The original group and its topics will be
* deleted. If the original group has a header it will be discarded.
*/
public void MergeGroupInto(int groupIndex, GroupedTopics target, int targetGroupIndex)
{
#if DEBUG
if (target == this)
{
throw new Exception("Cannot use MergeGroupInto() to transfer members in the same list.");
}
#endif
var group = groups[groupIndex];
int topicIndex_WithHeader = group.StartingIndex;
int topicIndex_NoHeader = group.StartingIndex;
int topicCount_WithHeader = group.Count;
int topicCount_NoHeader = group.Count;
if (group.Header != null)
{
topicIndex_NoHeader++;
topicCount_NoHeader--;
}
var targetGroup = target.groups[targetGroupIndex];
int targetTopicIndex = targetGroup.StartingIndex + targetGroup.Count;
// Move the topics
target.topics.InsertRange(targetTopicIndex, topics.GetRange(topicIndex_NoHeader, topicCount_NoHeader));
topics.RemoveRange(topicIndex_WithHeader, topicCount_WithHeader);
// Adjust the group counts and indexes
groups.RemoveAt(groupIndex);
for (int i = groupIndex; i < groups.Count; i++)
{
groups[i].StartingIndex -= topicCount_WithHeader;
}
targetGroup.Count += topicCount_NoHeader;
targetGroup.MembersChanged();
for (int i = targetGroupIndex + 1; i < target.groups.Count; i++)
{
target.groups[i].StartingIndex += topicCount_NoHeader;
}
}
/* Function: MoveGroupTo
* Moves the group and its topics to the target list. If a target group index is specified it will be inserted
* at that position. If not it will be added to the end of the list.
*/
public void MoveGroupTo(int groupIndex, GroupedTopics target, int targetGroupIndex = -1)
{
#if DEBUG
if (target == this)
{
throw new Exception("Cannot use MoveGroupTo() to transfer members in the same list.");
}
#endif
if (targetGroupIndex == -1)
{
targetGroupIndex = target.groups.Count;
}
var group = groups[groupIndex];
int topicIndex = group.StartingIndex;
int topicCount = group.Count;
int targetTopicIndex;
if (target.groups.Count == 0)
{
targetTopicIndex = target.topics.Count;
}
else if (targetGroupIndex >= target.groups.Count)
{
var lastGroup = target.groups[target.groups.Count - 1];
targetTopicIndex = lastGroup.StartingIndex + lastGroup.Count;
}
else
{
targetTopicIndex = target.groups[targetGroupIndex].StartingIndex;
}
// Move the topics
target.topics.InsertRange(targetTopicIndex, topics.GetRange(topicIndex, topicCount));
topics.RemoveRange(topicIndex, topicCount);
// Adjust the indexes of groups after the insertion.
for (int i = groupIndex + 1; i < groups.Count; i++)
{
groups[i].StartingIndex -= topicCount;
}
for (int i = targetGroupIndex; i < target.groups.Count; i++)
{
target.groups[i].StartingIndex += topicCount;
}
// Move the group entry
groups.RemoveAt(groupIndex);
group.ParentList = target.topics;
group.StartingIndex = targetTopicIndex;
target.groups.Insert(targetGroupIndex, group);
}
