sharepoint 2010. SPField set control for edit and preview

I need to add custom editor for my created sharepoint field. How can i set control both for edi开发者_如何学Pythont mode and preview mode. Will be two different controls!

I found that i can override FieldRenderingControl. But how to determine that current mode is edit or preview?

thanks.

---

In your custom field render control (BaseFieldControl) check on the member "ControlMode", which is of type SPControlMode.

protected override void CreateChildControls()
{
  base.CreateChildControls();

  if (ControlMode == SPControlMode.Display)
  {
    // create controls for display view form
  }
  else
  {
    // create controls for edit/new form
  } 

Also have a look on the methods "GetFieldValueAsText()" and "GetFieldValueAsHtml()" inherited from SPField. Since the are used to display the fields content in non-form location. For instance in list view or in the version history.