-----Original Message-----
I would be glad to provide code and further info if that
would help better describe the issue.
I think it probably would. It might be something as
simple as rememberingwhich controls are 0-based indices and which are 1-
based ;-)
Cheers
Grant
.
Cool, code to follow.
Just to clarify, when i access the selectedindex property
in the selectedIndexCh anged method, i can get the proper
value.
When i access the selectedindex property from outside the
control, i get what should be the previous value.
Any help would be much appreciated!
public class SelectableCombo Box :
System.Windows. Forms.ComboBox
{
private System.Componen tModel.Containe r
components = null;
bool LimitToList = true;
public SelectableCombo Box()
{
InitializeCompo nent();
}
protected override void Dispose( bool
disposing )
{
if( disposing )
{
if( components != null )
components.Disp ose
();
}
base.Dispose( disposing );
}
#region Component Designer generated code
private void InitializeCompo nent()
{
}
#endregion
protected override void OnKeyPress
(KeyPressEventA rgs e)
{
/*
* if the user pressed a non-
printing key
* let the default keypress
handler perform the
* default action
* KeyChar values in Hex (why
not :)
* 0x08 == Back Space character,
handled separately
*/
if (e.KeyChar != 0x08 &&
(e.KeyChar < 0x20 ||
e.KeyChar > 0x7E))
{
base.OnKeyPress (e);
return;
}
/*
* if the user pressed a character
or backspace
* then we need to drop down the
combobox and
* select the closest match for
the text and set
* the selected text.
*/
this.DroppedDow n = true; // drop
down the combobox
String oldText, newText;
// set oldText to only the text
the user has typed so far
oldText = this.Text.Subst ring(0,
this.SelectionS tart);
if (e.KeyChar == 0x08) //
backspace pressed
{
try // make sure we don't
cause an exception when subtracting 1 from our oldText
length
{
this.Text =
oldText.Substri ng(0, oldText.Length - 1);
}
catch (System.Excepti on
e2)
{
this.Text = "";
this.SelectedIn dex
= -1;
return;
}
/*
* the following if was
added to resolve an issue i was having where
* the combox box would
select a record and then not remove
* it the next time
backspace was pressed
*/
if (this.Text.Leng th == 0)
{ this.SelectedIn dex = -1; return; }
/*
* the following three
lines were added to resolve
* an issue i was having
where the combobox wouldn't
* reselect the current
item and place it's value
* into the text box.
*/
newText = this.Text; //
save the value of the text
this.SelectedIn dex = -
1; // deselect the current item
this.Text = newText; //
restore the value of the text
this.SelectedIn dex =
this.FindString (this.Text, 0); // find the nearest match
to our typed text
this.SelectionS tart =
oldText.Length - 1; // set the selection to only the text
the user hasn't typed
}
else
{
/*
* the following lines
were added to allow a limit
* to list functionality.
* if the new text isn't
in the list, replace
* with the current that
presumeably is in the list
*/
if ((this.LimitToL ist ==
true) &&
(this.FindStrin g
(oldText + e.KeyChar.ToStr ing(), 0) == -1))
{
e.Handled = true;
return;
}
// set this.text = the
previously typed text plus the latest char typed
this.Text = oldText +
e.KeyChar.ToStr ing();
/*
* the following three
lines were added to resolve
* an issue i was having
where the combobox wouldn't
* reselect the current
item and place it's value
* into the text box.
*/
newText = this.Text;
this.SelectedIn dex = -1;
this.Text = newText;
this.SelectedIn dex =
this.FindString (this.Text, 0); // find the nearest match
to our typed text
this.SelectionS tart =
oldText.Length + 1; // set the selection to only the text
the user hasn't typed
}
// finally set the length of the
selection so it goes to the end
if (this.Text.Leng th >
this.SelectionS tart)
{
this.SelectionL ength =
(this.Text.Leng th - this.SelectionS tart);
}
e.Handled = true; // let the
other handlers know we've taken care of this keypress
}
protected override void OnLeave(EventAr gs
e)
{
base.OnLeave (e);
this.Refresh();
//this.SelectedIn dex =
this.FindString (this.Text, 0); // find the nearest match
to our typed text
//System.Console. WriteLine
("Selected Index: " + this.SelectedIn dex + "\n");
}
protected override void
OnSelectedIndex Changed(EventAr gs e)
{
base.OnSelected IndexChanged (e);
System.Console. WriteLine("Sele cted
index: " + this.SelectedIn dex + "\n");
}
}
}
