1. treeview item events
I was looking in the archives for information on treeviews, but most of
it didn't make sense. I want to figure out how to trigger an event when
an treeview item gets a onMouse() event (or an equivalent). Is this
possible?
2. Re: treeview item events
There doesn't seem to be a way to trap mouse events (other than clicks) in a
treeview. I guess the control intercepts mouse messages before your prgram
gets to see them.
----- Original Message -----
From: <wick900 at operamail.com>
To: "EUforum" <EUforum at topica.com>
Subject: treeview item events
>
> I was looking in the archives for information on treeviews, but most of
> it didn't make sense. I want to figure out how to trigger an event when
> an treeview item gets a onMouse() event (or an equivalent). Is this
> possible?
>
>
>
>
>
>
3. Re: treeview item events
Yeah I thought of this, plus there is a "hover" event that can be tracked.
However, you can't see mouse down/up/move events and I assume this is what
is being asked for.
You can see click, double-click, right-click, right-double-click, hover,
drag-start, drag-end and tooltip note.
----- Original Message -----
From: "Bernie Ryan" <xotron at localnet.com>
To: "EUforum" <EUforum at topica.com>
Subject: RE: treeview item events
>
>
> Derek Parnell wrote:
> > There doesn't seem to be a way to trap mouse events (other than clicks)
> > in a
> > treeview. I guess the control intercepts mouse messages before your
> > prgram
> > gets to see them.
> >
>
> Derek:
>
> Why couldn't you intecept the tooltips notification
> message this would be triggered any time the mouse was over the
> item.
>
> Bernie
>
>
>
>
>
4. Re: treeview item events
- Posted by euman at bellsouth.net
Aug 11, 2001
I came in on the back end of this, you can return any message
from/to treeview with this.
-- tagNMHDR NMHDR_hwndFrom = 0,
NMHDR_idFrom = 4,
NMHDR_code = 8,
SIZEOF_NMHDR = 12
elsif iMsg = WM_NOTIFY then
id = peek4s(lParam + NMHDR_hwndFrom)
if id = TreeView then
iMsg = peek4s(lParam + NMHDR_code)
-- with the returned value "iMsg", any of the NM_* constants
-- work as well as the TVN_* notification messages...
ofcourse win32lib's way, Im not so sure about.....
this is how standard API codeing works.
Euman
euman at bellsouth.net
From: "Derek Parnell" <ddparnell at bigpond.com>
> There doesn't seem to be a way to trap mouse events (other than clicks) in a
> treeview. I guess the control intercepts mouse messages before your prgram
> gets to see them.
>
> From: <wick900 at operamail.com>
> > I was looking in the archives for information on treeviews, but most of
> > it didn't make sense. I want to figure out how to trigger an event when
> > an treeview item gets a onMouse() event (or an equivalent). Is this
> > possible?
5. Re: treeview item events
Hi,
----- Original Message -----
From: <euman at bellsouth.net>
To: "EUforum" <EUforum at topica.com>
Subject: Re: treeview item events
>
> I came in on the back end of this, you can return any message
> from/to treeview with this.
>
> -- tagNMHDR NMHDR_hwndFrom = 0,
> NMHDR_idFrom = 4,
> NMHDR_code = 8,
> SIZEOF_NMHDR = 12
>
>
> elsif iMsg = WM_NOTIFY then
>
> id = peek4s(lParam + NMHDR_hwndFrom)
>
> if id = TreeView then
>
> iMsg = peek4s(lParam + NMHDR_code)
>
> -- with the returned value "iMsg", any of the NM_* constants
> -- work as well as the TVN_* notification messages...
>
> ofcourse win32lib's way, Im not so sure about.....
> this is how standard API codeing works.
And guess what!?!?!?! Win3Lib uses the very same method - what a
coincidence! Ain't this a small planet, eh.
quote "you can return any message from/to treeview with this..."
Well, actually no you can't. You can only get NOTIFY'ed when the treeview
control sends a message to your program - and there is a fixed set of
messages available - not every message possible in Windows. And here are the
available ones, from the MS Docs...
NM_CLICK (tree view)
Notifies a tree view control's parent window that the user has clicked the
left mouse button within the control.
NM_CUSTOMDRAW (tree view)
Sent by a tree view control to notify its parent window about drawing
operations.
NM_DBLCLK (tree view)
Notifies a tree view control's parent window that the user has
double-clicked the left mouse button within the control.
NM_KILLFOCUS (tree view)
Notifies a tree view control's parent window that the control has lost the
input focus.
NM_RCLICK (tree view)
Notifies a tree view control's parent window that the user has clicked the
right mouse button within the control.
NM_RDBLCLK (tree view)
Notifies a tree view control's parent window that the user has
double-clicked the right mouse button within the control.
NM_RETURN (tree view)
Notifies a tree view control's parent window that the control has the input
focus and that the user has pressed the ENTER key.
NM_SETCURSOR (tree view)
Notifies a tree view control's parent window that the control is setting the
cursor in response to a WM_SETCURSOR message.
NM_SETFOCUS (tree view)
Notifies a tree view control's parent window that the control has received
the input focus.
TVN_BEGINDRAG
Notifies a tree view control's parent window that a drag-and-drop operation
involving the left mouse button is being initiated.
TVN_BEGINLABELEDIT
Notifies a tree view control's parent window about the start of label
editing for an item.
TVN_BEGINRDRAG
Notifies a tree view control's parent window about the initiation of a
drag-and-drop operation involving the right mouse button.
TVN_DELETEITEM
Notifies a tree view control's parent window that an item is being deleted.
TVN_ENDLABELEDIT
Notifies a tree view control's parent window about the end of label editing
for an item.
TVN_GETDISPINFO
Requests that a tree view control's parent window provide information needed
to display or sort an item.
TVN_GETINFOTIP
Sent by a tree view control that has the TVS_INFOTIP style. This
notification is sent when the control is requesting additional text
information to be displayed in a tooltip.
TVN_ITEMEXPANDED
Notifies a tree view control's parent window that a parent item's list of
child items has expanded or collapsed.
TVN_ITEMEXPANDING
Notifies a tree view control's parent window that a parent item's list of
child items is about to expand or collapse.
TVN_KEYDOWN
Notifies a tree view control's parent window that the user pressed a key and
the tree view control has the input focus.
TVN_SELCHANGED
Notifies a tree view control's parent window that the selection has changed
from one item to another.
TVN_SELCHANGING
Notifies a tree view control's parent window that the selection is about to
change from one item to another.
TVN_SETDISPINFO
Notifies a tree view control's parent window that it must update the
information it maintains about an item.
TVN_SINGLEEXPAND
Sent by a tree view control with the TVS_SINGLEEXPAND style when the user
opens or closes a tree item using a single click of the mouse.
And how do you get these messages using Win32lib?
--------------
procedure myNotify(atom iMsg, atom wParam, atom lParam)
atom lNewMsg
integer id
-- Only look at NOTIFY messages
if iMsg = WM_NOTIFY then
-- Get which notify message it is.
lNewMsg = fetch( lParam, NMHDR_code )
-- Get which control sent it.
id = getId( fetch(lParam, NMHDR_hwndFrom ) )
-- Now deal with ...
end if
end procedure
onEvent[mywin] = routine_id("myNotify")
------------
Not too difficult really. The above code works with all control types and
all message types.
But this doesn't solve the problem. Is it possible to get WM_LBUTTONDOWN
messages or their equivalent? I don't think so. Some deeper coding is
probably needed 'cos the Treeview DLL traps the mouse events prior to your
app getting them.
6. Re: treeview item events
- Posted by euman at bellsouth.net
Aug 12, 2001
> ORIGINAL QUESTION:
> I was looking in the archives for information on treeviews, but most of
> it didn't make sense. I want to figure out how to trigger an event when
> an treeview item gets a onMouse() event (or an equivalent).
> Is this possible?
I have no problems manipulating treeviews, maybe win32lib isnt up to
the challenge...
onMouse - Win32lib
onEvent - Win32lib
onClick - Win32lib
WM_LBUTTONDOWN - API
WM_RBUTTONDOWN - API
WM_MOUSEMOVE - API
WM_LBUTTONUP - API
WM_RBUTTONUP - API
and a few others, but because Im not a smart ass I wont include them
as Derek provided us with half the damn SDK last message.
I have a copy, thanks anyway Derek!
therefore, onMouse = WM_LBUTTONDOWN but because of the notification
message built into Treeview API, NM_CLICK must be the answer, eh!
oh but wait, what about a mouse moveing over our treeview
NMMOUSE and the point (pt) portion of the struct comes to mind here..
We wont go there unless Derek conceeds Win32lib cant do what API can...
You see, Event driven libraries are in-efficient in speed, size and ability.
Back to the ORIGINAL QUESTION:
elsif iMsg = WM_NOTIFY then
id = peek4s(lParam + NMHDR_hwndFrom)
elsif id = TreeView then
iMsg = peek4s(lParam + NMHDR_code)
if iMsg = NM_CLICK then
--Mouse click happened ontop of our treeview
-- DO SOMETHING................
Well, Derek your wrong about sending messages to treeview.
Are you saying that someone cant -on the fly- change charcteristics for
a treeview?!?!?!? by sending a message to the controls parent.
I think if you do this Derek that the treeview will respond which must
mean that the treeview got a message hence my term to/from in the prior
post.
Derek, I think it's great that you try so hard to defend win32lib.....
But most of us know the truth!
BLOAT, "find your way around that freakin maze."
SLOW, "try running an app on a 486, grab a cup of coffee and wait!"
LIMITED, "to the imagination of the creator/s."
EXTENDABILITY, "not for everyone, better off learning API."
BUG CITY, "too many to mention."
ETC...,
ETC...
Euman
euman at bellsouth.net
