QListView & item movement
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Hi @asanka424 @SGaist
I was able to set the item flags correctly but now I'm having problem with item changed signal.
How do I know where was the Item (it's row) before it was moved? (I can set the item's data to hold the current row but isn't there a better way?)And also I was searching the QStandardItemModel's signals to find something useful and I found QStandardItemModel::rowsMoved(...) and QStandardItemModel::rowsAboutToBeMoved(...) and I tried them but they don't ge triggred when an item is moved. why is that?
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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. -
this will enable drops in each item in your model. what you should do is disabling it like this
item->setFlags(item->flags() ^ Qt::ItemIsDropEnabled)
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 = 010andb = 110, thena ^ b == 100which is very different from the expected000.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 froma ^ bif you expand the xor in the other basic operationsa ^ b = (a & ~b) | (~a & b)/ -
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 -
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@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.
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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 = 010andb = 110, thena ^ b == 100which is very different from the expected000.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 froma ^ bif you expand the xor in the other basic operationsa ^ b = (a & ~b) | (~a & b)/@kshegunov
Yes agree with you. I just replied for the context where I knew the flag is set. -
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 -
Hi,
I tried this:
queueView->setDragEnabled(false);
and it didn't work.this problem isn't fixable :( :(
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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.
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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? -
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?
