// discovers the tree node structure (create subnodes)
private void DiscoverNode(TreeNode node)
{
Column column = node.Tag as Column;
// create tree nodes based on info from business object. Use existing Column only to
// correct the checked & text properties. This will guarantee that we have tree
// that match actual schema
PropertyDescriptorCollection properties = GetProperties(column);
if (properties.Count > 0)
{
foreach (PropertyDescriptor prop in properties)
{
Type type = prop.PropertyType;
bool isSimpleProperty = IsSimpleType(type);
bool isEnumerable = IsEnumerable(type);
// find existing column
Column childColumn = column.FindByPropName(prop.Name);
// column not found, create new one with default settings
if (childColumn == null)
{
if (isEnumerable)
{
childColumn = new BusinessObjectDataSource();
}
else
{
childColumn = new Column();
}
childColumn.Name = prop.Name;
childColumn.Alias = prop.DisplayName;
childColumn.SetBindableControlType(type);
// enable column if it is simple property (such as int), or it is class-type
// property that will not lead to loop. The latter is needed to enable all nested
// properties automatically
childColumn.Enabled = isSimpleProperty || (!isEnumerable && !IsLoop(node, type));
}
// update column's DataType - the schema may be changed
childColumn.DataType = type;
childColumn.PropName = prop.Name;
childColumn.PropDescriptor = prop;
if (!isSimpleProperty)
{
GetReference(column, childColumn);
}
AddNode(node.Nodes, childColumn);
}
}
else if (IsEnumerable(column.DataType))
{
Column childColumn = CreateListValueColumn(column);
AddNode(node.Nodes, childColumn);
}
}
private Column CreateListValueColumn(Column column)
{
Type itemType = ListBindingHelper.GetListItemType(column.DataType);
// find existing column
Column childColumn = column.FindByPropName("Value");
// column not found, create new one with default settings
if (childColumn == null)
{
childColumn = new Column();
childColumn.Name = "Value";
childColumn.Enabled = IsSimpleType(itemType);
childColumn.SetBindableControlType(itemType);
}
childColumn.DataType = itemType;
childColumn.PropName = "Value";
childColumn.PropDescriptor = null;
return(childColumn);
}
private void UpdateExistingObjects(Column column)
{
FNestingLevel++;
// reset property descriptors to determine later which columns are outdated
foreach (Column c in column.Columns)
{
c.PropDescriptor = null;
}
PropertyDescriptorCollection properties = GetProperties(column);
if (properties.Count > 0)
{
foreach (PropertyDescriptor prop in properties)
{
Type type = prop.PropertyType;
bool isSimpleProperty = IsSimpleType(type);
bool isEnumerable = IsEnumerable(type);
// find existing column
Column childColumn = column.FindByPropName(prop.Name);
// column not found, create new one
if (childColumn == null)
{
if (isEnumerable)
{
childColumn = new BusinessObjectDataSource();
}
else
{
childColumn = new Column();
}
column.Columns.Add(childColumn);
if (isEnumerable)
{
FNameCreator.CreateUniqueName(childColumn);
}
else
{
childColumn.Name = prop.Name;
}
childColumn.Alias = prop.DisplayName;
childColumn.SetBindableControlType(type);
// enable column if it is simple property, or max nesting level is not reached
childColumn.Enabled = isSimpleProperty || FNestingLevel < FMaxNestingLevel;
}
// update column's prop data - the schema may be changed
childColumn.DataType = prop.PropertyType;
childColumn.PropName = prop.Name;
childColumn.PropDescriptor = prop;
if (childColumn.Enabled && !isSimpleProperty)
{
GetReference(column, childColumn);
UpdateExistingObjects(childColumn);
}
}
}
else if (IsEnumerable(column.DataType))
{
CreateListValueColumn(column);
}
// remove non-existent columns
for (int i = 0; i < column.Columns.Count; i++)
{
Column c = column.Columns[i];
// delete columns with empty descriptors, except the "Value" columns
if (c.PropDescriptor == null && c.PropName != "Value")
{
column.Columns.RemoveAt(i);
i--;
}
}
FNestingLevel--;
}
