QListView & item movement

asanka424

You can try dataChanged signal but it won't identify moves explicitly.

BTW does drag and drop work as you expected now?

shahriar25

Hi @asanka424
Yes it does. if it won't work then I will have to set the user data every time an item moves. but I think there has to be another way.

kshegunov

@asanka424

what you should do is disabling it like this

item->setFlags(item->flags() ^ Qt::ItemIsDropEnabled)

Beware of such handling of flags!

It's a very wrong way to do it. If the flag is not set you'll actually enable it, additionally it doesn't work with compound flags! Suppose you have (in binary) a = 010 and b = 110, then a ^ b == 100 which is very different from the expected 000.

The proper way to remove a set of bits is to AND the inversion: a & ~b == 000
/and this can be rigorously proven to be different from a ^ b if you expand the xor in the other basic operations a ^ b = (a & ~b) | (~a & b)/

shahriar25

Hi @kshegunov . Thank you for correcting that I cahnged my code.
I tried the item changed flag and the data of item but it didn't work. I really don't know what to do

kshegunov

@shahriar25
Well I don't know, I can't spot anything plainly wrong, although there isn't much code to begin with. However, this line:

queueView->setDragEnabled(false);

does look suspicious, have you removed it as it had been suggested, because it's not clear from your answer to @asanka424's question.

asanka424

@kshegunov
Yes agree with you. I just replied for the context where I knew the flag is set.

shahriar25

Hi @asanka424 @kshegunov
Sorry for replying late.
an interesting thing happened:
when I set the flags of the items to
queueModel->item(i)->setFlags(queueModel->item(i)->flags() & !Qt::ItemIsDropEnabled);
the items get disabled!
bot when I do:
queueModel->item(i)->setFlags(queueModel->item(i)->flags() ^ Qt::ItemIsDropEnabled);
the is no problem. I think I'm doing something wrong.

ANd I will try:
queueView->setDragEnabled(false);
and get back with a result. thank all of you for answering again. I love this from and the people who answer the questions

shahriar25

Hi,
I tried this:
queueView->setDragEnabled(false);
and it didn't work.

this problem isn't fixable :( :(

SGaist

One thing you can try: start by setting the view mode or don't set it at all since you are using the default mode.

shahriar25

Hi,
I gave up moving the items by drag and droping them
Now I want to put move up and move down buttons
How can I move a selected index one item up or down?

shahriar25

Hi, I put two buttons for moving items up and down but when the buttons are pressed the listView goes out of focus and the selected items don't remain selected. how can I fix this?

and also how can I swap children of a QDomElement?