private void toggleExpanded(int rowindex)
{
List <PollutantTransfers.AreaTreeListRow> data = ViewState[RESULT] as List <PollutantTransfers.AreaTreeListRow>;
PollutantTransfers.AreaTreeListRow row = data[rowindex];
//toggle expansion
row.IsExpanded = !row.IsExpanded;
//get data from database, if not already loaded
if (row.HasChildren && row.IsExpanded && !data.Any(r => r.Level == row.Level + 1 && r.ParentCode == row.Code))
{
if (row.Level == 0)
{
var subareas = PollutantTransfers.GetSubAreas(SearchFilter, new List <string> {
row.CountryCode
});
addToResult(subareas);
}
}
this.lvPollutantTransfersAreas.DataSource = data;
this.lvPollutantTransfersAreas.DataBind();
// notify that content has changed (print)
if (ContentChanged != null)
{
ContentChanged.Invoke(null, EventArgs.Empty);
}
}
//Rows will only be shown if parent is expanded (grand-parents must be expanded too)
protected void rows_OnItemDataBound(object sender, ListViewItemEventArgs e)
{
ListViewDataItem dataItem = e.Item as ListViewDataItem;
if (dataItem == null)
{
return; //safe check
}
int rowindex = dataItem.DataItemIndex;
PollutantTransfers.AreaTreeListRow row = dataItem.DataItem as PollutantTransfers.AreaTreeListRow;
List <PollutantTransfers.AreaTreeListRow> data = ViewState[RESULT] as List <PollutantTransfers.AreaTreeListRow>;
//Countries need not to be considered. Will always be visible
bool collapsed = false;
if (row.Level > 0)
{
//is country collapsed?
collapsed = !data.Single(d => d.CountryCode == row.CountryCode && d.Level == 0).IsExpanded;
}
dataItem.Visible = !collapsed;
}
