public override object GetValue(object component)
{
FieldCalculatorCollection fieldEditors = component as FieldCalculatorCollection;
if (fieldEditors != null && fieldEditors.Fields != null)
{
EPField fld = fieldEditors.Fields[Name];
if (fld != null)
{
return(fld.calculator);
}
}
return(null);
}
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
if (context != null && context.Instance != null && provider != null)
{
IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
if (edSvc != null)
{
FieldCalculatorCollection calculators = context.Instance as FieldCalculatorCollection;
if (calculators != null)
{
FieldCalculator ev = (FieldCalculator)value;
if (ev == null)
{
ev = new FieldCalculator();
ev.FieldName = context.PropertyDescriptor.Name;
}
MathNodeRoot root = ev.GetExpression();
if (root == null)
{
root = new MathNodeRoot();
ev.SetExpression(root);
}
System.Drawing.Point curPoint = System.Windows.Forms.Cursor.Position;
rc.X = curPoint.X;
rc.Y = curPoint.Y;
IMathEditor dlg = root.CreateEditor(rc);
dlg.SetScopeMethod(root.ScopeMethod);
dlg.MathExpression = (IMathExpression)root.Clone();
dlg.MathExpression.ScopeMethod = root.ScopeMethod;
dlg.MathExpression.EnableUndo = true;
if (edSvc.ShowDialog((Form)dlg) == DialogResult.OK)
{
root = (MathNodeRoot)dlg.MathExpression;
ev = new FieldCalculator();
ev.SetExpression(root);
ev.FieldName = context.PropertyDescriptor.Name;
value = ev;
calculators.SetItem(ev);
}
}
}
}
return(value);
}