OpenEuphoria

2. RE: ListView SINGLE-click detection

• Posted by Andy Drummond <kestrelandy at xalt.co.uk> Oct 20, 2001
• 388 views

Dan,

My apologies in return.

What I did was put an onEvent() procedure in my program for the
control I was interested in, and add a trace(1). Then every message
for that control got trapped and I could see on the Euphoria debug
screen what messages I was getting. I write them down and see what
they all are.  

Probably better to simply declare a static sequence and add them into
it for every message, then grab it later and see what messages I got.
Sometimes it is very revealing, but usually it is totally confusing,
Windows being what it is.  Maybe I should write a module to convert
the message into a list of WM_WHATEVER's to make it easier to see
what is going on.

It's a pretty basic method, but as I don't understand Windows most of
the time - which is why I use Euphoria + Win32Lib + IDE to make code
for it. So when I get a situation like that I have to simply see what
Windows is doing and make my own interpretation of it.

Andy.

Dan Moyer wrote:
> Andy,
> 
> Your listView single click detection method is clearly interesting & 
> simple,
> sorry if I made it seem I didn't think it would work, I didn't mean to.
> I'll try it too.  I did get the gist of it, but your further explanation
> also helped.  But it was what I take to be a *general* debug idea you
> suggested that I didn't really understand and which intrigued me.  You 
> said,
> > > > What I do is trap EVERY message in a trace(1) and see what sequence
> > > > is likly to do what I want. this works fine for me, so it should
> > > > for you to.
> 
> Could you explain *that* idea a little more?
> 
> Dan
> 
> 
> ----- Original Message -----
> From: "Andy Drummond" <kestrelandy at xalt.co.uk>
> To: "EUforum" <EUforum at topica.com>
> Sent: Friday, October 19, 2001 10:42 AM
> Subject: RE: ListView SINGLE-click detection
> 
> 
> > Dan
> >
> > The idea is this:  there seems to be no sensible event for a single
> > click on a ListView. So I put a procedure in the listview onEvent[]
> > list, and then every message for the listview gets to that procedure.
> >
> > There I look for what's needed, in this case a WM_PAINT when the item
> > clicked on is re-painted with a highlight bar. I distinguish this from
> > unhighlighting by seeing if this item is one I have already handled.
> > So if it's a new item, I first remember which one it is so I don't
> > do the works again, then I go do whatever I want on this single click.
> >
> > My routine is actually ShowSelected() which I use to show the details
> > of the listview item I clicked on. That way I can click on items in a
> > listview and as I do show the details in another window ... and it
> > seems to work just dandy! It also seems very simple to implement with
> > no problems.... just thought it might solve your problem ...
> >
> > Andy
> >
> >
> > Dan Moyer wrote:
> > > Andy,
> > >
> > > I *think* I can follow what you're doing, in your specific example, but
> > > not
> > > sure exactly what you mean by your general method of trapping every
> > > message,
> > > and it sounds useful!
> > >
> > > Here's approximately what Euman suggested, which *works* for single
> > > click
> > > detection:
> > >
> > > -- first make an extended style listview
> > > global constant ListView2 = createEx( ListView, {}, Window1, 12, 16,680,
> > > 132,or_all({LVS_REPORT,LVS_SINGLESEL}), or_all({LVS_EX_FULLROWSELECT,
> > > LVS_EX_ONECLICKACTIVATE}))
> > >
> > > -- but since (apparently) the extended styles don't get properly set(?),
> > > re-set them:
> > > object junk
> > > atom lvMask
> > > -- makes full row selected, hand pointer moving on listview items
> > > selects
> > > them,
> > > --  single click is responded to:
> > > lvMask = or_all({LVS_EX_FULLROWSELECT,LVS_EX_TRACKSELECT ,
> > > LVS_EX_ONECLICKACTIVATE })
> > >
> > > -- hovertime makes selection happen as quick as can move mouse:
> > > junk = sendMessage( ListView2, LVM_SETHOVERTIME, 0, 1)-- 1=quick select
> > > junk = sendMessage( ListView2, LVM_SETEXTENDEDLISTVIEWSTYLE, lvMask,
> > > lvMask)
> > >
> > > -- & then in an onMouse event:
> > > if event = WM_LBUTTONDOWN then
> > >    if  getLVCount(ListView2) then
> > >        index = getLVSelected(ListView2)
> > >        if length(index) then
> > >
> > >
> > > Dan
> > >
> > >
> > > ----- Original Message -----
> > > From: "Andy Drummond" <kestrelandy at xalt.co.uk>
> > > To: "EUforum" <EUforum at topica.com>
> > > Sent: Friday, October 19, 2001 5:51 AM
> > > Subject: ListView SINGLE-click detection
> > >
<snip>