xBRowser drag & drop question

[Otto]

Is there somewhere an example how to drag&drop inside a xBrowser.
Thanks in advance
Otto

[nageswaragunupudi]

Mr Otto
Please test this program

Code: Select all  Expand view

#include 'fivewin.ch'

FUNCTION Main()

LOCAL oWnd, oBrw, oCur, i, aData := {}

   FOR i := 1 TO 6
      AAdd( aData, { str(i,2), "Description " + Str( i ), Replicate( Chr( 64 + i ), 5 ) } )
   NEXT i

   DEFINE CURSOR oCur DRAG
   DEFINE WINDOW oWnd
   oBrw      := TXBrowse():New( oWnd )
   oBrw:SetArray( aData )
   oBrw:CreateFromCode()
   oWnd:oClient := oBrw
   //
   oBrw:oDragCursor   := oCur
   oBrw:bDragBegin   := { |nRow,nCol,nFlags| DragBegin( nRow, nCol, nFlags, oBrw ) }
   oBrw:bDropOver      := { |uDropInfo, nRow, nCol, nFlags| DropOver( uDropInfo, nRow, nCol, nFlags, oBrw ) }
   //
   ACTIVATE WINDOW oWnd
   oCur:End()

RETURN NIL

STATIC FUNCTION DragBegin( nRow, nCol, nFlags, oBrw )

   SetDropInfo( EVAL( oBrw:SelectedCol():bStrData ) )

RETURN NIL

STATIC FUNCTION DropOver( uDropInfo, nRow, nCol, nFlags, oBrw )

   oBrw:lButtonDown( nRow, nCol, nFlags)
   oBrw:lButtonUp(   nRow, nCol, nFlags)

   MsgInfo( uDropInfo + CRLF + 'dropped on' + CRLF + ;
            EVAL( oBrw:SelectedCol():bStrData ) )

RETURN NIL


[Enrico Maria Giordano]

Nice sample, thank you!

EMG

[Otto]

NageswaraRao, thank you very much.
I was so free to put it on www.fwcodesnips.com
Best regards,
Otto

[Otto]

Hello NageswaraRao,

I filled your example with real data and inserted a function to scroll during drag.
Dragbegin gives me the record which I drag.
Dropover the record where I drop.

But now I am a little uncertain how to change the position of the records in the browser and refresh the browser.
Maybe you have an advice for me.

www.atzwanger.com/lexikon/lexikon.zip
is what I have so far.

Best regards
Otto

[nageswaragunupudi]

Do you want that if the cursor goes above browse area it should page up and if it goes below browse area if should page down?

If so please try the following code

Code: Select all  Expand view

function CheckListbox( nRow, nCol, oBrw, oLbx, nKeyFlags,oChild )

   if nRow < oBrw:HeaderHeight()
      oBrw:PageUp()
   elseif nRow > ( oBrw:BrwHeight() - oBrw:FooterHeight() )
      oBrw:PageDown()
   endif

return nil


Please let me know if this is what you were looking for.

[Otto]

NageswaraRao,
thank you for your help. Your code is better than that I had.
Scrolling is working.
But what is the best way to change the record position. Sure I have to use an index.
But then?
Best regards,
Otto

[nageswaragunupudi]

Even with indexes this code works fine. What more do you want to do ?

[Otto]

Hello NageswaraRao,
…
Peach
Fillet of perch
Swiss sautéed turkey
Smoked salmon
Mushrooms on toast
Bacon
…

For example: I drag <Fillet of perch> and drop it over <Bacon> then the new order
should be:
…
Peach
Swiss sautéed turkey
Smoked salmon
Mushrooms on toast
Fillet of perch
Bacon
…
Best regards,
Otto

[Enrico Maria Giordano]

You must swap the content of the two records or swap just the content of an indexed field.

EMG

[nageswaragunupudi]

Obviously if we want to achieve what he wants, we need to have a separate order column and play with the order serial numbers there. I am working on it

[nageswaragunupudi]

Ofcourse with arrays it is very easy and simple. Just delete the dragged row and insert before the row on which it is dropped.

[nageswaragunupudi]

Mr Otto,

Here is the solution. First you restructure the dbf like this.

1) Change the NUMMER field as NUMERIC with Width 18 and Decimals 13. ( NUMMER, 'N', 18, 13 ).
2) Create Index on NUMMER field. I have used DBFCDX and created a TAG with name NUMMER.

Having done upto this please make the following changes in your code:

Code: Select all  Expand view

before function Main:
REQUEST DBFCDX

// change the dbf open code like this:

    USE  C:\FWH\samples\LEXIKON.DBF  NEW ALIAS LEX EXCLUSIVE VIA 'DBFCDX'
    DBEVAL( {|| LEX->NUMMER := RECNO() } )
    SET ORDER TO TAG NUMMER
    GO TOP

// replace the new drag and drop functions given below

STATIC FUNCTION DragBegin( nRow, nCol, nFlags, oBrw )

   SetDropInfo( (oBrw:cAlias)->( recno() ) )

RETURN NIL

STATIC FUNCTION DropOver( uDropInfo, nRow, nCol, nFlags, oBrw )

   LOCAL nDragRec := uDropInfo
   LOCAL nThisRec
   LOCAL nThisKey
   LOCAL nPrevKey := 0

   oBrw:lButtonDown( nRow, nCol, nFlags )
   oBrw:lButtonUp(   nRow, nCol, nFlags )

   nThisRec       := (oBrw:cAlias)->( RECNO() )
   nThisKey       := (oBrw:cAlias)->NUMMER

   ( oBrw:cAlias )->( dbSKIP( -1 ) )
   IF !(oBrw:cAlias)->( bof() )
      nPrevKey      := ( oBrw:cAlias )->NUMMER
   ENDIF
   ( oBrw:cAlias )->( dbGOTO( nDragRec ) )
   ( oBrw:cAlias )->NUMMER   := ( nThisKey + nPrevKey ) / 2
   ( oBrw:cAlias )->( dbGOTO( nThisRec ) )
   oBrw:Refresh()

RETURN NIL



Now you will get the effect you are looking for.
I shall send revised prg and dbf to your personal email

[James Bott]

NageswaraRao,

I am curious, why 13 decimal places for your nummer field? Recno()'s are integers.

James

[Otto]

All is working. Thank you very much.
Best regards,
Otto