Customising the incremental search in the ListBoxControl

Hi James,
Unfortunately, it's a rather difficult task to implement this behavior, because the search functionality is implemented via the ListBoxSearch class whose methods are not virtual. However, you can implement your custom ListBoxSearch class based on our source code. To use your class in the ListBoxControl, you need to pass it via the reflection mechanism:

C#
public class MyListBoxSearch: ListBoxSearch  
{  

}  

private void Form1_Load(object sender, EventArgs e)  
{  
    PropertyInfo pi = typeof(ListBoxControl).GetProperty("Handler", BindingFlags.Instance | BindingFlags.NonPublic);  
    ListBoxControlHandler handler = pi.GetValue(listBoxControl1, null) as ListBoxControlHandler;  
    lbs = new ListBoxSearch(this.listBoxControl1, new ListBoxControlHandler.SingleSelectState(handler));  
    pi = typeof(ListBoxControlHandler).GetProperty("ControlState", BindingFlags.Instance | BindingFlags.NonPublic);  
    ListBoxControlHandler.ListBoxControlState state = pi.GetValue(handler, null) as ListBoxControlHandler.ListBoxControlState;  
    FieldInfo fi = typeof(ListBoxControlHandler.ListBoxControlState).GetField("search", BindingFlags.Instance | BindingFlags.NonPublic);  
    fi.SetValue(state, lbs);  
}  

Hope this information will help you achieve the desired result.
If you encounter any problem when accomplishing your task, please don't hesitate to contact us.
Thanks
Dimitros

Hi Dimitros,
Thanks for that. That should get me going however from my initial investigation into your code I can see that the highlight is always taken from position zero. Any hints on what I need to change to get the control to highlight the correct text?

Hi Dimotros,
Whilst I can inject my new object derived from ListBoxSearch into the ListBox, my new FindString method is not called.
Can you supply an example showing this working please.

fyi, here's what I have:
        public class MyListBoxSearch : ListBoxSearch
        {
        public MyListBoxSearch(BaseListBoxControl listBox, DevExpress.XtraEditors.ListBoxControlHandler.ListBoxControlState controlState)
        : base( listBox, controlState )
        {
          }
        public bool KeyPress(char chr)
        {
            if ((chr == ' ' && IsEmpty) || chr == '\r')
                return false;
            string newSearch = GetNewSearch(chr);
            return FindNext(newSearch, !IncrementalSearch, true);
        }
        protected bool FindNext(string s, bool startFromNext, bool updown)
        {
               if(string.IsNullOrEmpty(s)) {
                    Reset();
                    return true;
               }
               int newIndex = FindString(s, startFromNext, updown);
               if(newIndex != -1) {
                    CurrentSearch = s;
                    FocusedIndex = newIndex;
                    SelectedIndex = newIndex;
               }
               return newIndex != -1;
          }
        }
I can see the construction of my object being called but none of the other methods.