OpenEuphoria

Re: Win32Lib: listbox: select item with RIGHT mouse click?

• Posted by Matt Lewis <matthewwalkerlewis at YAHOO.COM> Sep 02, 2000
• 926 views

That's exactly what I'm talking about. :)  A hittest is basically figuring out
which, if any, item is 'hit' by a given point.  In this case, we're interested
in finding out which item might be under the mouse pointer.  Take a look at
hitTestTV (in Win32Lib) to get an idea (although windows does most of the hard
stuff for that).

I don't have the details of LB_GETITEMRECT and LB_GETTOPINDEX in front of me,
but you can find them in either the Win32 help file (which everyone who codes
in windows should have handy) or online at Microsoft's MSDN library (just do a
search at msdn.microsoft.com).

I think the hit test pseudo code should go something like this:

- get the position of the mouse cursor
- figure out how big each item in the list box is (you could do this ahead of
time)
- get the first item listed
- compute how far down on the list the mouse is, based on the item size
- if there is an item there (ie, if the list is long enough), return the index

Then, in an onMouse routine for your listbox, I'd trap the right click, and do
a hittest.  If a positive index is returned, set that as the selection, and
then do whatever else you wanted (like opening a popup menu).

Matt

--- Dan B Moyer <DANMOYER at PRODIGY.NET> wrote:
> Matthew,
>
> Could you explain what you mean by a "hit test"(ie, hits what, since no
> index is returned), & how to use LB_GETITEMRECT and LB_GETTOPINDEX for the
> hit testing?  (Are you talking about getting the size( y extent) of the
> listbox, the y position of the right-mouse click in the listbox, the number
> of items in the listbox, the y size of each item, & then compute which item
> was clicked on from all that??)
>
> Dan
>


__________________________________________________
Do You Yahoo!?
Yahoo! Mail - Free email you can access from anywhere!
http://mail.yahoo.com/