private void DecreaseIndentationButton_Click(object sender, RoutedEventArgs e)
{
List <GanttChartItem> items = new List <GanttChartItem>();
foreach (GanttChartItem item in GanttChartDataGrid.GetSelectedItems())
{
items.Add(item);
}
if (items.Count <= 0)
{
MessageBox.Show("Cannot decrease indentation for the selected item(s) as the selection is empty; select an item first.", "Information", MessageBoxButton.OK);
return;
}
items.Reverse();
foreach (GanttChartItem item in items)
{
if (item.Indentation > 0)
{
int index = GanttChartDataGrid.IndexOf(item);
GanttChartItem nextItem = index < GanttChartDataGrid.Items.Count - 1 ? GanttChartDataGrid[index + 1] : null;
if (nextItem == null || item.Indentation >= nextItem.Indentation)
{
item.Indentation--;
}
else
{
MessageBox.Show(string.Format("Cannot increase indentation for {0} because the next item is one of its child items; decrease the indentation of its child items first.", item), "Information", MessageBoxButton.OK);
}
}
else
{
MessageBox.Show(string.Format("Cannot decrease indentation for {0} because it is on the first indentation level, being a root item.", item), "Information", MessageBoxButton.OK);
}
}
}
private void IncreaseIndentationButton_Click(object sender, RoutedEventArgs e)
{
List <GanttChartItem> items = new List <GanttChartItem>();
foreach (GanttChartItem item in GanttChartDataGrid.GetSelectedItems())
{
items.Add(item);
}
if (items.Count <= 0)
{
MessageBox.Show("Cannot increase indentation for the selected item(s) as the selection is empty; select an item first.", "Information", MessageBoxButton.OK);
return;
}
foreach (GanttChartItem item in items)
{
int index = GanttChartDataGrid.IndexOf(item);
if (index > 0)
{
GanttChartItem previousItem = GanttChartDataGrid[index - 1];
if (item.Indentation <= previousItem.Indentation)
{
item.Indentation++;
}
else
{
MessageBox.Show(string.Format("Cannot increase indentation for {0} because the previous item is its parent item; increase the indentation of its parent item first.", item), "Information", MessageBoxButton.OK);
}
}
else
{
MessageBox.Show(string.Format("Cannot increase indentation for {0} because it is the first item; insert an item before this one first.", item), "Information", MessageBoxButton.OK);
}
}
}
