// expand row
public bool ExpandRow(int row)
{
// sanity
if (row < Rows.Fixed || row >= Rows.Count)
{
return(false);
}
// check that the row is not already expanded
C1FlexDataTree childGrid = Rows[row].UserData as C1FlexDataTree;
if (childGrid != null)
{
return(false);
}
// check that we have a data source for this row
object dataSource = _colChild != null? _colChild[row] : null;
if (!(dataSource is IBindingList))
{
return(false);
}
// add node row (unbound) to display child
Rows.InsertNode(row + 1, -1);
// make new row non-editable (it's just a placeholder)
Rows[row + 1].AllowEditing = false;
// create child grid
childGrid = new C1FlexDataTree();
childGrid.Visible = false;
childGrid.ScrollBars = ScrollBars.Horizontal;
// attach child grid to parent, set data source
Controls.Add(childGrid);
childGrid.DataSource = dataSource;
// save references:
// child grid Tag property contains a reference to the parent row
// parent row UserData contains a reference to the child grid
childGrid.Tag = Rows[row];
Rows[row].UserData = childGrid;
// make child grid visible, move it into position
childGrid.Visible = true;
childGrid.UpdatePosition();
childGrid.Focus();
// done
return(true);
}
// update size/position of all child grids and of this grid within this parent.
// this is called when the grid scrolls, when it's size changes, and when
// rows or columns are added, removed, or resized.
private void UpdateChildren()
{
// update position of all children
for (int row = 0; row < Rows.Count; row++)
{
C1FlexDataTree child = Rows[row].UserData as C1FlexDataTree;
if (child != null)
{
child.UpdatePosition();
}
}
// and update position of this grid within its parent
UpdatePosition();
}
