OpenEuphoria

RE: The ComboBox Problems

• Posted by Derek Parnell <Derek.Parnell at SYD.RABOBANK.COM> Jun 05, 2002
• 408 views

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> -----Original Message-----
> From: Bernie Ryan [mailto:xotron at localnet.com]
> Sent: Thursday, 6 June 2002 7:33
> To: EUforum
> Subject: The ComboBox Problems
> 
> 
> What should a combobox display in the edit contol
> when it is displayed ? ( the list contains items )

The currently *selected* item.

> ex6.exw in the win32lib shows a open list which was
> changed from the original ex6.exw used combobox and
> its edit control was shows a empty blue box.

When you say "combobox" I assume you really mean DropDownList. This is a
type of combobox in which the user can only select items that are in the
list - the user cannot edit the 'editbox' portion of the combo. 

The "empty blue box" signifies that there is NO item currently selected. 

> The index returned by the combo or list box should
> return a zero based index but the code adds one to it.

In the Microsoft (and C) world, most array references are zero-based.
However, in Euphoria and the average person's world, most array references
are one-based. That is, we normally start counting a list of items by
starting with "one". In win32lib, we have endeavoured to remain consistent
with Euphoria's one-based referencing (NB: even Eu is not consistent in this
regard considering that routine_id's start at zero). 

> If you click on the original ex6.exw demo without
> selecting any thing the index returned is zero ?

Thus when getIndex() is called, it returns a one-based number indicating the
number of the list item that is selected. If it returns a zero, it means
that there is NO item currently selected.

> I'am trying to make my w32engin.ew compatible with the
> win32lib but I want the code to work the way it works
> in windows "C" code.

You cannot have both. Either you have a one-based system or a zero-based
system. 

--------
Derek.

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