public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
if (context != null && provider != null && context.Instance != null)
{
MathematicExpression me = context.Instance as MathematicExpression;
if (me != null)
{
IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
if (edSvc != null)
{
Point curPoint = System.Windows.Forms.Cursor.Position;
rc.X = curPoint.X;
rc.Y = curPoint.Y;
MathExpEditor.ExcludeProjectItem = true;
IMathEditor dlg = me.CreateEditor(rc);
MathExpEditor.ExcludeProjectItem = false;
MathNodeRoot r = new MathNodeRoot();
r.SetWriter(me.GetWriter());
r.SetReader(me.GetReader());
try
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(me.Formula.Xml);
if (doc.DocumentElement != null)
{
r.Load(doc.DocumentElement);
}
}
catch
{
}
dlg.MathExpression = r;
dlg.MathExpression.EnableUndo = true;
try
{
if (edSvc.ShowDialog((Form)dlg) == DialogResult.OK)
{
r = (MathNodeRoot)dlg.MathExpression;
r.FindAllInputVariables();
XmlDocument doc = new XmlDocument();
XmlNode rootNode = doc.CreateElement(MathematicExpression.XML_Root);
doc.AppendChild(rootNode);
r.SetWriter(me.GetWriter());
r.SetReader(me.GetReader());
r.Save(rootNode);
value = new FormulaProperty(doc.OuterXml);
PropertyGrid pg = null;
Type t = edSvc.GetType();
PropertyInfo pif0 = t.GetProperty("OwnerGrid");
if (pif0 != null)
{
object g = pif0.GetValue(edSvc, null);
pg = g as PropertyGrid;
if (pg != null)
{
me.SetPropertyGrid(pg);
}
}
}
}
catch (Exception err2)
{
MessageBox.Show(MathException.FormExceptionText(null, err2), "Math Expression Editor", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
return(value);
}