Programatic Listview item select problems..

[Matt Williamson]

I'm having trouble with programmatically selecting items in a listview
and being able to reset that and do it again.. here is a better
explanation. I have a combo box and a listview. The combo box is an
input field for a search of the listview. when I do the first search, it
works perfectly.. But, subsequent searches will not work until I
physically click an item with the mouse. i.e I'm using

Call SendMessage(lstview.hwnd, LVM_SETITEMSTATE, -1, LV) to clear it of
all selections then
Call SendMessage(lstview.hwnd, LVM_SETITEMSTATE, 0, LV) to select the
first item in the listview.

Is there something else I need to feed it to tell it that I did that? I
mean is it just a visual and not returning that something is actually
selected? My code for the whole process is long and convoluted, but I
can post key parts if it will help at all.. is there another way to do
this? I tried the listview.listitem.selected but I'm getting that it's
read-only at runtime.. that's why I opted to use the API route..

TIA

Matt

[Damit Senanayake]

"Matt Williamson" <"N0 $paM-Mattwil"@pce.net> wrote in message
news:38FA6140.D00F1968@pce.net...

: Call SendMessage(lstview.hwnd, LVM_SETITEMSTATE, -1, LV) to clear it of
: all selections then
: Call SendMessage(lstview.hwnd, LVM_SETITEMSTATE, 0, LV) to select the
: first item in the listview.

How are you defining/filling out LV?

Also, LVIS_SELECTED is &H2, but I suppose you knew that... and Randy posted
a VB method in another NG.

Here's a quote from the docs you may want to look at:

LV_ITEM:
>>
state
Indicates the item's state, state image, and overlay image. The stateMask
member indicates the valid bits of this member.
Bits 0 through 7 of this member contain the item state flags. This can be
one or more of the item state values.

Bits 8 through 11 of this member specify the one-based overlay image index.
Both the full-sized icon image list and the small icon image list can have
overlay images. The overlay image is superimposed over the item's icon
image. If these bits are zero, the item has no overlay image. To isolate
these bits, use the LVIS_OVERLAYMASK mask. To set the overlay image index in
this member, you should use the INDEXTOOVERLAYMASK macro. The image list's
overlay images are set with the ImageList_SetOverlayImage function.

Bits 12 through 15 of this member specify the state image index. The state
image is displayed next to an item's icon to indicate an application-defined
state. If these bits are zero, the item has no state image. To isolate these
bits, use the LVIS_STATEIMAGEMASK mask. To set the state image index, use
the INDEXTOSTATEIMAGEMASK macro. The state image index specifies the index
of the image in the state image list that should be drawn. The state image
list is specified with the LVM_SETIMAGELIST message.

stateMask
Value specifying which bits of the state member will be retrieved or
modified. For example, setting this member to LVIS_SELECTED will cause only
the item's selection state to be retrieved.
This member allows you to modify one or more item states without having to
retrieve all of the item states first. For example, setting this member to
LVIS_SELECTED and state to zero will cause the item's selection state to be
cleared, but none of the other states will be affected.

To retrieve or modify all of the states, set this member to (UINT)-1.

You can use the macro ListView_SetItemState both to set and to clear bits.


<<
--
Damit Senanayake | damit@mvps.org | http://members.xoom.com/damit
Please reply to newsgroups, not by e-mail. | ICQ: 6930718

[Damit Senanayake]

"Matt Williamson" <"N0 $paM-Mattwil"@pce.net> wrote in message
news:38FA6140.D00F1968@pce.net...

: Call SendMessage(lstview.hwnd, LVM_SETITEMSTATE, -1, LV) to clear it of
: all selections then
: Call SendMessage(lstview.hwnd, LVM_SETITEMSTATE, 0, LV) to select the
: first item in the listview.

How are you defining/filling out LV?

Also, LVIS_SELECTED is &H2, but I suppose you knew that... and Randy posted
a VB method in another NG.

Here's a quote from the docs you may want to look at:

LV_ITEM:
>>
state
Indicates the item's state, state image, and overlay image. The stateMask
member indicates the valid bits of this member.
Bits 0 through 7 of this member contain the item state flags. This can be
one or more of the item state values.

Bits 8 through 11 of this member specify the one-based overlay image index.
Both the full-sized icon image list and the small icon image list can have
overlay images. The overlay image is superimposed over the item's icon
image. If these bits are zero, the item has no overlay image. To isolate
these bits, use the LVIS_OVERLAYMASK mask. To set the overlay image index in
this member, you should use the INDEXTOOVERLAYMASK macro. The image list's
overlay images are set with the ImageList_SetOverlayImage function.

Bits 12 through 15 of this member specify the state image index. The state
image is displayed next to an item's icon to indicate an application-defined
state. If these bits are zero, the item has no state image. To isolate these
bits, use the LVIS_STATEIMAGEMASK mask. To set the state image index, use
the INDEXTOSTATEIMAGEMASK macro. The state image index specifies the index
of the image in the state image list that should be drawn. The state image
list is specified with the LVM_SETIMAGELIST message.

stateMask
Value specifying which bits of the state member will be retrieved or
modified. For example, setting this member to LVIS_SELECTED will cause only
the item's selection state to be retrieved.
This member allows you to modify one or more item states without having to
retrieve all of the item states first. For example, setting this member to
LVIS_SELECTED and state to zero will cause the item's selection state to be
cleared, but none of the other states will be affected.

To retrieve or modify all of the states, set this member to (UINT)-1.

You can use the macro ListView_SetItemState both to set and to clear bits.


<<
--
Damit Senanayake | damit@mvps.org | http://members.xoom.com/damit
Please reply to newsgroups, not by e-mail. | ICQ: 6930718

[Matt]

I got the info strait off of vbNet. this example
http://www.mvps.org/vbnet/code/comctl/lvselectall.htm
everything seems to work well, but for some reason, it isn't returning
anything to the ListView to tell it that the item has been selected
again. That only happens after I click the first item (although it is
already selected from the code) so, it seems that it is only a visual
indication and isn't returning that as the listindex.. which.. now that
I think about it, could be the answer.. heh.. I'll try setting the
listindex and seeing if that helps.

Matt

[Matt]

I got the info strait off of vbNet. this example
http://www.mvps.org/vbnet/code/comctl/lvselectall.htm
everything seems to work well, but for some reason, it isn't returning
anything to the ListView to tell it that the item has been selected
again. That only happens after I click the first item (although it is
already selected from the code) so, it seems that it is only a visual
indication and isn't returning that as the listindex.. which.. now that
I think about it, could be the answer.. heh.. I'll try setting the
listindex and seeing if that helps.

Matt