ListView Column
Rob Panosh
example I Have the following columns
FirstName LastName Address
If the user uses the mouse and clicks in between the column headers they can
resize. I want to prevent the user from doing this on certian columns.
Does anybody know how to do this? ... or what messages to trap on the
ListView when the column header starts to resize?
Thanks,
--
Rob Panosh
Advanced Software Designs
Tom
will help you. From the Win32SDK, it says the notification messages are sent to
the parent window, so you might need to subclass your window and add these to
its dispatch method.
Tom Wood
Thomas Wood - Programmer
Bainbridge, Pennsylvania, USA
(717) 615-2215
Amilcar A. Camargo
On Tue, 8 Jan 2002 15:04:31 -0600, "Rob Panosh"
<rob_p...@asdsoftware.com> wrote:
>I am trying to keep the user from sizing certian ListView columns. For
>example I Have the following columns
[snip]
From MSDN, HDN_BEGINTRACK notification message is sent to your
listview when the user begins to resize a column. If you code a
dispatch for your listview and return TRUE, resizing is prevented (I
haven't tested it).
HTH,
Amilcar A. Camargo F.
Sand, S. A.
Guatemala, C. A.
Rob Panosh
I am not an expert on trapping these kind of messages. Here is a start of
my dispatch on my Split window that owns the listview. Could you ( or
somebody else lurking ) give me a little help?
METHOD Dispatch(oEvent) CLASS FormQueryResults_STD // this is a splitwindow.
//
//s
//
// REP: 12.21.2001 - Created.
// Note: My listview is in the first pane.
DO CASE
CASE oEvent:Message == WM_NOTIFY
// I am assuming this is where I trap the HDN_BEGINTRACK message.
// Some help would be appreciated.
ENDCASE
RETURN SUPER:Dispatch(oEvent)
Thanks,
Rob Panosh
"Amilcar A. Camargo" <acam...@acfsoft.com> wrote in message
news:3c3c7afe...@News.cis.dfn.de...
Marc
Search message to/from me around 6 months ago.
You're going to have to get a handle to the header control used by the
ListView. Search CodeGuru or some other such programmer sites.
Then you can intercept messages to the header.
Here are a few methods from my browser class and my Header control
class that I use to handle this issue with Classmate's browser control.
IIRC, the header control's owner-draw stuff was for other issues.
HTH,
-Marc-
//
class FpHeaderControl inherit cHeaderControl
//
~"ONLYEARLY+"
protect nCurrentCol as longint
protect lAllowItemResize as logic
declare access ColumnNo
declare assign ColumnNo
declare method GoOwnerDraw
declare method DisableItemResize
~"ONLYEARLY-"
//
//
access ColumnNo as longint pascal class FpHeaderControl
//
~"ONLYEARLY+"
return self:nCurrentCol
~"ONLYEARLY-"
//
//
assign ColumnNo(nCol as longint) as longint pascal class FpHeaderControl
//
~"ONLYEARLY+"
self:nCurrentCol := nCol
return nCol
~"ONLYEARLY-"
//
//
method Init(oParent,xID,oOrigin,oSize,cClassName,nStyle,nExtStyle) class FpHeaderControl
// Initialize and subclass
//default nStyle to _or(WS_CHILD,HDS_BUTTONS,HDS_HORZ,)
super:Init(oParent,xID,oOrigin,oSize,cClassName,nStyle,nExtStyle)
self:Subclass()
self:lAllowItemResize := true
self:nCurrentCol := -1
return self
//
//
method _ProcessNotifyMsg(oEvent as cControlNotifyEvent) as longint pascal class FpHeaderControl
//
~"ONLYEARLY+"
if oEvent:NotifyCode == HDN_BEGINTRACK
if .not. self:lAllowItemResize
return 1L // Don't do it
endif
endif
return super:_ProcessNotifyMsg(oEvent)
~"ONLYEARLY-"
//
//
method OnSetCursor(oEvent as cEvent) as longint pascal class FpHeaderControl
// Prevent Cursor change if .not. lAllowItemResize
~"ONLYEARLY+"
// Intercept Divider Drag
if .not. self:lAllowItemResize
return 1
endif
return super:OnSetCursor(oEvent)
~"ONLYEARLY-"
//
//
method OnMouseButtonDown(oEvent as cMouseEvent) as longint pascal class FpHeaderControl
// Prevent sensitivity to Divider Click when .not. lAllowItemResize
local nHitTestCodes as dword
local nItemIndex as longint
local oBB as cBoundingBox
local nX as longint
local nPos as dword
~"ONLYEARLY+"
if .not. self:lAllowItemResize
nItemIndex := self:HitTest( oEvent:Position, @nHitTestCodes )
if _and(nHitTestCodes, HHT_ONDIVIDER) == HHT_ONDIVIDER
// Is the divider click inside THIS item?
oBB := self:GetItemBoundingBox(nItemIndex)
if .not. oBB:PointInside(oEvent:Position)
// Must be in the NEXT!
oBB := self:GetItemBoundingBox(nItemIndex + 1)
endif
// Send a dummy click to the selected item
// Make sure the position is well centered within the item
nX := oBB:Left + ( (oBB:Right - oBB:Left) / 2 )
nPos := MakeLong(word(_cast, nX), word(_cast, oEvent:Position:Y))
self:SendMessage( WM_LBUTTONDOWN, MK_LBUTTON, longint(_cast, nPos) )
return 0
endif
endif
return super:OnMouseButtonDown(oEvent)
~"ONLYEARLY-"
//
//
method DisableItemResize() as void pascal class FpHeaderControl
// Disable Resizing of items via divider dragging
~"ONLYEARLY+"
self:lAllowItemResize := false
return
~"ONLYEARLY-"
//
//
method GoOwnerDraw() as void pascal class FpHeaderControl
// Convert all Header items to ownerdraw
local nItemIndex as longint
local oHdrItem as cHeaderControlItem
~"ONLYEARLY+"
for nItemIndex := 0 upto (self:ItemCount - 1)
oHdrItem := self:GetItem(nItemIndex)
oHdrItem:Alignment := HDF_OWNERDRAW
self:SetItemAttributes( oHdrItem, nItemIndex)
next
return
~"ONLYEARLY-"
//
//
method OnOwnerDraw_DrawItem(oEvent as cEvent) as longint pascal class FpHeaderControl
// custom draw for multi-line Header items
local sDI as _WINDRAWITEMSTRUCT
local oHdrItem as cHeaderControlItem
local pText as psz
local sDrawRect is _WINRECT
~"ONLYEARLY+"
// Get the DrawItem structure
sDI := ptr(_cast, oEvent:lParam)
// Get the individual Header Item info.
oHdrItem := self:GetItem( longint(_cast, sDi.ItemId) )
// Draw the header text
pText := StringAlloc( oHdrItem:Caption )
// Adjust the rectangle so we start text a bit further down
CopyRect(@sDrawRect, @sDi.rcItem)
sDrawRect.Top += 1
DrawText(sDI.hDC, pText, longint(_cast, sLen(oHdrItem:Caption)), @sDrawRect, DT_CENTER)
MemFree(pText)
return Longint(_cast, TRUE)
~"ONLYEARLY-"
//
//
///////////////////////////////////////////////////////////////////
//
method Init(oParent,xID,oOrigin,oSize,nStyle,nExtStyle) class FpDataBrowser
.. Excerpt sample: replace the default header control with my own
// Replace the cHeaderControl with FpHeaderControl
self:oHdr:EndWindow()
self:oHdr := NULL_OBJECT
self:oHdr := FpHeaderControl{self}
self:oHdr:_AutoAlign(NULL_OBJECT)
self:oHdr:Show(SW_NORMAL)
.. Other init
//
//
method DisableColResize() as void pascal class FpDataBrowser
// Disable Resizing of columns via Header item divider dragging
local oHeader as FpHeaderControl
~"ONLYEARLY+"
self:lEnableColResize := false
oHeader := self:oHdr
oHeader:DisableItemResize()
return
~"ONLYEARLY-"
//
//
method OnHeaderControlItemClick(oEvent as cHeaderControlItemClickEvent) as longint pascal class FpDataBrowser
// Process Mouse Clicks on the Header Control. DividerDoubleClick == AutoSize.
local nItem as longint
~"ONLYEARLY+"
if !self:EditEnd(false)
return 0
endif
// See if Parent:OnDataBrowserColumnClick() wants to handle this.
if logic(_cast, self:_FireEvent(DBE_COLUMNCLICK, oEvent))
nItem := oEvent:ItemIndex
if nItem >= 0 .and. nItem <= self:nLastColumn
do case
// Single Click to header.
case oEvent:Click
// Sort by the column
// Do not handle here. Handle in subclass.
// self:SortOnColumn(nItem)
// self:Refresh()
// Double Click on Divider.
case oEvent:DividerDoubleClick
if self:lEnableColResize
// Automatically size the column
self:AutoSizeColumn(nItem)
self:Repaint()
self:_ExtEditSetColOptControlPos()
endif
endcase
endif
endif
return 0
~"ONLYEARLY-"
//
Amilcar A. Camargo
On Wed, 9 Jan 2002 15:11:48 -0600, "Rob Panosh"
<rob_p...@asdsoftware.com> wrote:
>Amilcar,
>
>I am not an expert on trapping these kind of messages.
I'm not either... :-)
> Here is a start of
>my dispatch on my Split window that owns the listview. Could you ( or
>somebody else lurking ) give me a little help?
>
>METHOD Dispatch(oEvent) CLASS FormQueryResults_STD // this is a splitwindow.
My best bet is that you have to catch it up in your ListView subclass.
The header control is a child of your ListView. The following code
should get you started. It's from the top of my mind so you have to
double check it:
[Begin Sample]
METHOD Dispatch( oEv ) CLASS MyListView
LOCAL pNM AS _winNMHEADER
DO CASE
// Notify
CASE oEv:Message == WM_NOTIFY
pNM := PTR( _CAST, oEv:lParam )
// If resizing my column
IF pNM.hdr._code == HDN_BEGINTRACK
// If its on my column (zero based)
IF pNM.iItem == 2 // Third column
RETURN 1L // No allow
ENDIF
ENDIF
ENDCASE
RETURN SUPER:Dispatch( oEv )
[End Sample]
Rob Panosh
I put the following code on my list view and you can see I have a tone
within the HDN_BEGINTRACK and it never go off. Looks like the message is
never passed. Any Ideas?
Rob
METHOD Dispatch(oEvent) CLASS FormQueryResultsLV_STD
LOCAL pNM AS _winNMHEADER
//
//s
//
// REP: 12.21.2001 - Created.
DO CASE
CASE oEvent:Message == WM_NOTIFY
pNM := PTR( _CAST, oEvent:lParam )
// If resizing my column
IF pNM.hdr._code == HDN_BEGINTRACK
Tone(1800,1)
// If its on my column (zero based)
IF pNM.iItem == 2 // Third column
RETURN 1L // No allow
ENDIF
ENDIF
CASE oEvent:Message == WM_MOUSEWHEEL
IF HiWord( oEvent:wParam ) = 65416 // scrollind down ... if scrolling up
it will = 120
SendMessage(SELF:Owner:Handle(0), (WM_USER+99), UNITINCREMENT, 0 )
ENDIF
ENDCASE
RETURN SUPER:Dispatch(oEvent)
"Amilcar A. Camargo" <acam...@acfsoft.com> wrote in message
news:3c3d00b...@News.cis.dfn.de...
Stephane Hebert
Maybe your system is "tone deaf" ?
You could always use MessageBeep(), remember ? <g>
--
============================
Stéphane Hébert
ste...@audiocontrole.com
============================
"Rob Panosh" <rob_p...@asdsoftware.com> a écrit dans le message news:
3c3d...@nntp01.splitrock.net...
> Amilcar,
>
> I put the following code on my list view and you can see I have a tone
> within the HDN_BEGINTRACK and it never go off. Looks like the message is
> never passed. Any Ideas?
>
> Rob
>
> METHOD Dispatch(oEvent) CLASS FormQueryResultsLV_STD
> LOCAL pNM AS _winNMHEADER
> //
> file://s
Rob Panosh
"Stephane Hebert" <sgtp...@bootcamp.com> wrote in message
news:Fgj%7.10785$p04.3...@news20.bellglobal.com...
Amilcar A. Camargo
On Thu, 10 Jan 2002 07:16:02 -0600, "Rob Panosh"
<rob_p...@asdsoftware.com> wrote:
>Amilcar,
>
>I put the following code on my list view and you can see I have a tone
>within the HDN_BEGINTRACK and it never go off. Looks like the message is
>never passed. Any Ideas?
[snip]
Let me put some time appart to test it and see if I can come with
something usefull.
Regards,
Rob Panosh
"Amilcar A. Camargo" <acam...@acfsoft.com> wrote in message
news:3c3dfac7...@News.cis.dfn.de...
Amilcar A. Camargo
On Thu, 10 Jan 2002 20:56:06 GMT, acam...@acfsoft.com (Amilcar A.
Camargo) wrote:
>Let me put some time appart to test it and see if I can come with
>something usefull.
After some testing, even if I catch the TRACKING messages the ListView
column gets resized. Below is a copy of a message sometime ago, BTW a
response to Stephane from Paolo Cherubini:
[Begin Copy]
From: "Paolo Cherubini" <pa...@ats.it>
Date: Mon, 24 Sep 2001 18:19:46 +0200
Hello,
Try the following code.
It simply restore the original width of an item in the header of a
listview after a drag.
Ciao Paolo
------------------------------
METHOD Dispatch(oE) CLASS MyWindow
STATIC lStart:=FALSE AS LOGIC , ;
nItem :=0 AS INT , ;
nLung :=0 AS INT
LOCAL sNotifica AS _winHD_NOTIFY, ;
sColonna IS _WINHDITEM
&& Select the notify messages
IF oE:Message=WM_NOTIFY
&& Fill the structure with the notify informations
sNotifica:=PTR(_CAST, oE:lParam)
&& The user is dragging a divider in the header control
IF sNotifica.hdr._code=HDN_TRACK
IF !lStart
&& Do remeber next call the dragging already started
lStart:=TRUE
&& Ask the header control about the width of the
&& current item at this moment
sColonna.Mask:=HDI_WIDTH
SendMessage(sNotifica.hdr.hwndFrom , ;
HDM_GETITEM , ;
DWORD(_CAST, sNotifica.iItem), ;
LONGINT(_CAST, @sColonna))
&& Store the item width
nLung:=sColonna.cxy
&& Store the item number
nItem:=sNotifica.iItem
ENDIF
// The item changed
ELSEIF sNotifica.hdr._code==HDN_ITEMCHANGED
&& lStart true in here means the user finished doing the drag
IF lStart
SUPER:Dispatch(oE)
lStart:=FALSE
&& Restore the original width of the item
sColonna.Mask := HDI_WIDTH
sColonna.cxy := nLung
SendMessage(sNotifica.hdr.hwndFrom, ;
HDM_SETITEM , ;
DWORD(_CAST, nItem) , ;
LONGINT(_CAST, @sColonna))
RETURN 0L
ENDIF
ENDIF
ENDIF
RETURN SUPER:Dispatch(oE)
[End Copy]
HTH,
Karl-Heinz Rauscher
i trap HDN_ITEMCHANGING and check for HDI_WIDTH. The advantage is that a
user keyboard input like [strg][alt][+] is recognized also. The columns to
prevent from resizing are stored in a array that you must fill
via the Preventresizing assign.
sample:
oDCListView1:Preventresizing := { #COLUMN1 , #COLUMN4 }
regards
Karl-Heinz
----------------------------------
STRUCT _winHDITEM
MEMBER mask AS DWORD
MEMBER cxy AS INT
MEMBER pszText AS PSZ
MEMBER hbm AS PTR
MEMBER cchTextMax AS INT
MEMBER fmt AS INT
MEMBER lParam AS LONG
MEMBER iImage AS INT
MEMBER iOrder AS INT
STRUCT _winNMHEADER
MEMBER hdr IS _WINNMHDR
MEMBER iItem AS INT
MEMBER iButton AS INT
MEMBER pitem AS _WINHDITEM
DEFINE HDN_ITEMCHANGING := (HDN_FIRST-20) // Error: only the
HDN_ITEMCHANGINGW DEFINE works ....
CLASS NewListView INHERIT ListView
PROTECT _aPreventResize := {} AS ARRAY
METHOD Dispatch ( oEvent ) CLASS MyListView
LOCAL struNotify AS _winNMHDR
LOCAL struMHeader AS _winNMHEADER
LOCAL oColumn AS ListViewColumn
LOCAL nColumn AS LONG
LOCAL symColumn AS SYMBOL
DO CASE
CASE oEvent:message == WM_NOTIFY
struNotify := PTR ( _CAST , oEvent:lParam )
IF struNotify._code == HDN_ITEMCHANGING
struMHeader := PTR ( _CAST , oEvent:lParam )
IF _and ( struMHeader.pItem.mask , HDI_WIDTH ) == HDI_WIDTH
nColumn := struMHeader.iItem + 1
IF ( oColumn := SELF:__GetColumnFromIndex(nColumn) ) != NULL_OBJECT
symColumn := oColumn:namesym
IF AScan ( SELF:PreventResize , { | a | a == symColumn } ) > 0
RETURN SELF:eventReturnvalue := 1L
ENDIF
ENDIF
ENDIF
ENDIF
ENDCASE
RETURN SUPER:Dispatch ( oEvent )
METHOD INIT( oOwner , nID, oPoint, oDimension, kStyle ) CLASS NewListView
SUPER:INIT ( oOwner , nID, oPoint, oDimension, kStyle )
ACCESS PreventResize () CLASS NewListView
RETURN _aPreventResize
ASSIGN PreventResize ( aColumns ) CLASS NewListView
RETURN _aPreventResize := aColumns
Rob Panosh
I have tried this code. The problem I am having is message HDN_TRACK is NOT
being passed to the Dispatch on my splitwindow.
Rob
"Amilcar A. Camargo" <acam...@acfsoft.com> wrote in message
news:3c3e46dd...@News.cis.dfn.de...
Rob Panosh
Works Perfect .... Thank you! Do you have code to keep the cursor from
changing to a split bar? I want to keep the arrow on these columns.
Rob
"Karl-Heinz Rauscher" <khrau...@compuserve.com> wrote in message
news:a1m4c7$rm4cj$1...@ID-61886.news.dfncis.de...
Amilcar A. Camargo
On Fri, 11 Jan 2002 07:10:52 -0600, "Rob Panosh"
<rob_p...@asdsoftware.com> wrote:
>Amilcar,
>
>I have tried this code. The problem I am having is message HDN_TRACK is NOT
>being passed to the Dispatch on my splitwindow.
Subclass the listview and trap them in the ListView Dispatch().
Regards,