-----Original Message-----
I think it probably would. It might be something as simple as remembering
which 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 selectedIndexChanged 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 SelectableComboBox :
System.Windows.Forms.ComboBox
{
private System.ComponentModel.Container
components = null;
bool LimitToList = true;
public SelectableComboBox()
{
InitializeComponent();
}
protected override void Dispose( bool
disposing )
{
if( disposing )
{
if( components != null )
components.Dispose
();
}
base.Dispose( disposing );
}
#region Component Designer generated code
private void InitializeComponent()
{
}
#endregion
protected override void OnKeyPress
(KeyPressEventArgs 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.DroppedDown = true; // drop
down the combobox
String oldText, newText;
// set oldText to only the text
the user has typed so far
oldText = this.Text.Substring(0,
this.SelectionStart);
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.Substring(0, oldText.Length - 1);
}
catch (System.Exception
e2)
{
this.Text = "";
this.SelectedIndex
= -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.Length == 0)
{ this.SelectedIndex = -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.SelectedIndex = -
1; // deselect the current item
this.Text = newText; //
restore the value of the text
this.SelectedIndex =
this.FindString(this.Text, 0); // find the nearest match
to our typed text
this.SelectionStart =
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.LimitToList ==
true) &&
(this.FindString
(oldText + e.KeyChar.ToString(), 0) == -1))
{
e.Handled = true;
return;
}
// set this.text = the
previously typed text plus the latest char typed
this.Text = oldText +
e.KeyChar.ToString();
/*
* 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.SelectedIndex = -1;
this.Text = newText;
this.SelectedIndex =
this.FindString(this.Text, 0); // find the nearest match
to our typed text
this.SelectionStart =
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.Length >
this.SelectionStart)
{
this.SelectionLength =
(this.Text.Length - this.SelectionStart);
}
e.Handled = true; // let the
other handlers know we've taken care of this keypress
}
protected override void OnLeave(EventArgs
e)
{
base.OnLeave (e);
this.Refresh();
//this.SelectedIndex =
this.FindString(this.Text, 0); // find the nearest match
to our typed text
//System.Console.WriteLine
("Selected Index: " + this.SelectedIndex + "\n");
}
protected override void
OnSelectedIndexChanged(EventArgs e)
{
base.OnSelectedIndexChanged (e);
System.Console.WriteLine("Selected
index: " + this.SelectedIndex + "\n");
}
}
}
