OpenEuphoria

Re: [WIN] ListView: what event is response to clicking on item? (& attn: Fabio)

• Posted by Dan Moyer <DANIELMOYER at prodigy.net> Oct 19, 2001
• 506 views

Matt,

I did find that LVN_ITEMCHANGED constant in "Winconst.ew", but couldn't
figure out how to use it.

I can use the "onEvent" thingy in a sort of "cut'n'paste" way, but don't
really understand it very well.  (I'm guessing that's what's involved?)

At your convenience, could you explain more fully how to make use of
LVN_ITEMCHANGED ?

I've used Eumans suggestion, for listview selection tracking mouse
movements, and single click activation, but LVN_ITEMCHANGED  is maybe closer
to how one might expect to use it, like "onChange" (or at least consistent
with how we get stuff from other lists).

Dan

----- Original Message -----
From: "Matthew Lewis" <matthewwalkerlewis at YAHOO.COM>
To: "EUforum" <EUforum at topica.com>
Sent: Friday, October 19, 2001 5:25 AM
Subject: RE: [WIN] ListView: what event is response to clicking on item? (&
attn: Fabio)


>
>
> > -----Original Message-----
> > From: Derek Parnell [mailto:ddparnell at bigpond.com]
>
> > It seems that the library doesn't implement this yet. The
> > best you can do
> > for now (other than euman's suggestion) is to trap the
> > WM_NOTIFY event for
> > the listview's parent window. Then extract the notification
> > code and if it's
> > NM_CLICK and the control id in the message matches the
> > Listview's id, you
> > can then use getLVSelected() etc...
> >
> > If you like, I can play around to get the exact code you'd need.
> >
>
> IIRC, ListViews don't handle mouse events like most controls, but I'm
fairly
> certain that you can get the NM_CLICK to work.  Alternatively, you could
> look for LVN_ITEMCHANGED:
>
> LVN_ITEMCHANGED
>
>
> Notifies a list-view control's parent window that an item has changed.
This
> notification message is sent in the form of a WM_NOTIFY message.
>
> LVN_ITEMCHANGED
>     pnmv = (LPNMLISTVIEW) lParam;
>
> Parameters
> pnmv
> Address of an NMLISTVIEW structure that identifies the item and specifies
> which of its attributes have changed. If the iItem member of the structure
> pointed to by pnmv is -1, the change has been applied to all items in the
> list view.
> Return Values
> No return value.
>
> Remarks
> If a list-view control has the LVS_OWNERDATA style, and the user selects a
> range of items by holding down the SHIFT key and clicking the mouse,
> LVN_ITEMCHANGED notifications are not sent for each selected or deselected
> item. Instead, you will receive a single LVN_ODSTATECHANGED notification,
> indicating that a range of items has changed state.
>
>
> Of course, you'll have to make sure that it's the LVIS_SELECTED that's
> changed...
>
> Matt Lewis
>