qtablewidget drag and drop move row

[Luigi Ferraris]

Hi to everyone.
I need to move row[s] between two QTablewidget objects; I'm able to enable drag&drop but always a copy action is performed.

I think this settings QTableWidget:setDefaultDropAction ( Qt::MoveAction ) as documented in http://qt-project.org/doc/qt-4.8/qtablewidget-members.html can solve my problem but it seems not working.

Can everyone give me help.

Cheers

Luigi Ferraris

[Luigi Ferraris]

Hi guys,
I have not read any reply to this message (help request): I am the only one who has this need?
I have writed about QTableWidget but this operation can be done also with other object: QTreeWidget, QListWidget, etc.
I think can be very interesting in a gui application....

Anyway....

Cheers

[Pritpal Bedi]

Hi Luigi

I have not read any reply to this message (help request): I am the only one who has this need?
I have writed about QTableWidget but this operation can be done also with other object: QTreeWidget, QListWidget, etc.
I think can be very interesting in a gui application....

Not everybody can reply to your message, it was extremely complex.

Only those who have had the need to do so and have already done can do so.

So until above creteria is met by one, you need to investigate yourself.

Pritpal Bedi

 

[Luigi Ferraris]

Il 07/04/2013 0.30, Pritpal Bedi ha scritto:

Not everybody can reply to your message, it was extremely complex.

Only those who have had the need to do so and have already done can do so.

So until above creteria is met by one, you need to investigate yourself.

Hi Pritpal, many thanks for your answer but probably my english is very bad.... As I write in previous message I'm able to do "drag&drop" between (ie) two QTablewidget.
But with current HbQt methods it is only possible to do a copy not a move (move add a "remove" action from source object).

In a very brief code example: oObject-1 and oObject-2 are two QTablewidget. I want to do a "drag&drop" action but only from oObject-2 to oObject-1.
I can set:
oObject-1 := QTablewidget(....)
oObject-1:setDragEnabled(.T.)
oObject-1:setDropIndicatorShown(.T.)
oObject-1:setDragDropMode( QAbstractItemView_DropOnly )
oObject-1:viewport:setAcceptDrops(.T.)

oObject-2 := QTablewidget(....)
oObject-2:setDragEnabled(.T.)
oObject-2:setDropIndicatorShown(.T.)
oObject-2:setDragDropMode( QAbstractItemView_DragOnly )
oObject-2:viewport:setAcceptDrops(.F.)

This code works fine but you can only perform a copy (see below) of items from oObject-2 to oObject-1
I think that :setDefaultDropAction( Qt_MoveAction ) can solve the problem as documented in
http://qt-project.org/doc/qt-4.8/qabstractitemview.html#defaultDropAction-prop

defaultDropAction : Qt::DropAction

This property holds the drop action that will be used by default in QAbstractItemView::drag().

If the property is not set, the drop action is CopyAction when the supported actions support CopyAction.

This property was introduced in Qt 4.6.

Access functions:

Qt::DropAction	defaultDropAction () const
void	setDefaultDropAction ( Qt::DropAction dropAction )

So, can be enabled :defaultDropAction and :setDefaultDropAction methods?
I don't know if you must write (ie) a C++ workaround to have these abilities with HbQt or it's only required to add these "void" for setting up different behaviour.
If I was able to write C++ I was very happy to help you: I'm sorry.

Luigi Ferraris

[Luigi Ferraris]

Il 08/04/2013 9.07, Pritpal Bedi ha scritto:

2013-04-08 00:04 UTC-0800 Pritpal Bedi (bedipritpal at hotmail.com)(r201)

  * hbqt/qtgui/qth/QAbstractItemView.qth

    + Added: DragDropMode dragDropMode () const

             void setDragDropMode ( DragDropMode behavior )

       For Qt 4.6 and above. Pointed out by Luigi.

 

Hi Pritpal,
after your improvement, I want share my experience using drag and drop with qtablewidget

My problem was: I want MOVE item[s] from one object (source) to the other one (target).

You can see the starting situation in 00.jpg: on the left side target object on the right side source object


Then I select (only) one row from source (see 01.jpg)


Then I do a drag and drop MOVEaction; you can see the end in 02.jpg



To perform this operation, I have used for:
- SOURCE object (right side)
   :setDragEnabled( .T. )
   :setDropIndicatorShown(.T.)
   :setDefaultDropAction( Qt_MoveAction )
   :setDragDropMode( QAbstractItemView_DragOnly )
     :setDragDropOverwriteMode( .F. )

- TARGET object (left side)
   :viewport:setAcceptDrops(.T.)
   :setDragEnabled( .T. )
   :setDropIndicatorShown(.T.)
   :setDragDropMode( QAbstractItemView_DropOnly )
     :setDragDropOverwriteMode( .T. )
    
I hope this can be useful for hbqt users.

A problem (I must investigate better):
I have coded :connect( QEvent_Drop, { |e| udf_drop(e) } ) for both objects, but I can't trace anything into udf_drop function

Many thanks
Best regards
Luigi Ferraris

[Pritpal Bedi]

Hi

I hope this can be useful for hbqt users.

Certainly.

It is better to write a small demo app for this to be understood by a beginner.

Pritpal Bedi

 

[Luigi Ferraris]

Il 08/04/2013 20.32, Pritpal Bedi ha scritto:

Certainly.

It is better to write a small demo app for this to be understood by a beginner.

Pritpal Bedi

Hi Pritpal.
In attachement you can find a sample. I hope is clear and usable.
Fell free to do changes to follow HbQt / Harbour rules (ie coding style).

I want to show two different usage: COPY action and MOVE action.
Different settings can give different behaviour: it's to long to show any combinations....
I have include some links to give idea where find other infos on QT docs.

I confirm problem related with QEvent_Drop usage: it seems not fired on.
I've not used in sample, but you can test it adding
:connect( QEvent_Drop, { | e | QDrop(e) } )

to every QTableWidget and add this function at the end of source

STATIC FUNCTION QDrop( e )
    LOCAL oQtObject := e:source()
    MsgBox( oQtObject:className() )
RETURN .F.

Cheers

--
Luigi Ferraris
mail: luigfe...@gmail.com
website: www.L3W.it

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Thank you!

[Luigi Ferraris]

Il 12/04/2013 4.32, Karl ha scritto:

+1

I can confirm I have the same problem as Luigi using the QListWidget().  Even when dropping (trying to move) within the same list.

Please let me know if additional sample code is needed.

Karl

Hi Karl.
About "... same problem....": are you speaking about connected event?

If yes, I think can be a Qt problem, because (googling) I found several blog about this problem (and they are using C++ language without binding for Qt). I have tested on Qt 5.0.1 and the problem still the same.
So, or there are problems with Qt (general speaking) or is a Windows/QtLibrary problem (some *nix user can do a test using connected event to catch something while drag&drop is performed?) or I'm doing some mistake or I'm losing piece of code (to setting object in a right way).

If not: d&d (copyaction or moveaction) it doesn't works with QListWidget?

Luigi

[Karl]

Whoops,

sorry my mistake.  I did not read that Pritpal has fixed it in the current hbqt version.  I will download and try it again and will let you know.

Karl

[Karl]

Works fine with the current hbqt version, now supporting:

  ::list:setDefaultDropAction( Qt_MoveAction )

Thanks to Pritpal ;)

 Karl