How to get item after drag item from QListWidget Thumbnails

[amarism]

I am trying to find the item number or position that is drag from QListWidgetItem Thumbnails.
I want to call this function when i droping the item inside view

void mainWindows::onThumbItemClicked(QListWidgetItem* item)
{
if (((obj->GetNumOfSeries()) > 0))
{
    for (int i = 0; i < (obj->GetNumOfSeries()); i++)
    {
        if (this->ui->m_ThumblistWidget->item(i) == item)
          {
            obj->SeriesChange(i);
            LoadViewer(false);
          }
      }
   }
}

for this function calling I need to get ListWidgetItem when i select. This function is working when i will click the thumbnail item. Now, I want to call same function i will drag an item.

[VRonin]

This should be useful: https://forum.qt.io/post/444126 (QGraphicsSceneDragDropEvent and QDropEvent behave in the same way for this case)

[amarism]

@VRonin what is Module in this position " doSomethingWithModule(userRoleIter->value<Module>()); "

[VRonin]

That is very specific to the original question.
What you really care about is the code above, up to if(!mimeReader.commitTransaction()) break;.
At that point you have the row index inrow and the data contained in the cell you dragged from in modelData

[amarism]

@VRonin here modelData size is 4. and row is assign 2 in my code . I have write similar code for my problem.

void QvtkOpenGLWidgetdrag::dropEvent(QDropEvent *event)
{
const QMimeData *mimeData = event->mimeData();
QListWidgetItem *item = new QListWidgetItem;

if (mimeData->hasFormat("application/x-qabstractitemmodeldatalist")) {
	QByteArray encoded = mimeData->data("application/x-qabstractitemmodeldatalist");
	QDataStream stream(&encoded, QIODevice::ReadOnly);

	while (!stream.atEnd()) {
		int row;
		int col;
		QMap<int, QVariant> roleDataMap;
		stream >> row >> col >> roleDataMap;
		QIcon icon = roleDataMap.value(1).value<QIcon>();
                m_pixmap = icon.pixmap(icon.availableSizes().first());
		//test->onThumbItemClicked(item);
		update();
	}
}
else {
	event->ignore();
}
}

[VRonin]

• roleDataMap.value(1) 1 is Qt::DecorationRole, do you save the icon in that role in the model you are dragging from?
• QListWidgetItem *item = new QListWidgetItem; is unused and leaked. What is that for?

[amarism]

@VRonin just creating "QListWidgetItem *item = new QListWidgetItem;" to pass the item from this class

[VRonin]

@amarism said in How to get item after drag item from QListWidget Thumbnails:

just creating "QListWidgetItem *item = new QListWidgetItem;" to pass the item from this class

???

[amarism]

@VRonin When I start to drag item from list widget then who to call the same item directly inside the " onThumbItemClicked(QListWidgetItem* item) "

[VRonin]

onThumbItemClicked

Do you want to respond to a click or to a drag?

[amarism]

@VRonin on drag bcz onClick is working fine for me.

[VRonin]

And do you want to know it as soon as the item is dragged or when it gets dropped somewhere else?

[amarism]

@VRonin when item is drag from listWidget

[VRonin]

then you need to reimplement void startDrag(Qt::DropActions supportedActions) with:

void startDrag(Qt::DropActions supportedActions){
QTableWidget::startDrag(supportedActions);
QModelIndexList indexes = selectionModel()->selectedIndexes();
    auto isNotDragEnabled = [this](const QModelIndex &index) {
        return !(model()->flags(index) & Qt::ItemIsDragEnabled);
    };
    indexes.erase(std::remove_if(indexes.begin(), indexes.end(),
                                 isNotDragEnabled),
                  indexes.end());
QVector<QListWidgetItem*> draggetItems;
draggetItems.reserve(indexes.size());
for(auto& index : qAsConst(indexes))
draggetItems << itemAt(index.row()));
// now draggetItems contains the list of dragged items

[amarism]

@VRonin said in How to get item after drag item from QListWidget Thumbnails:

QModelIndexList indexes = selectedIndexes();

Its showing selectIndex() is undefined.

I m added this one code for startDrag:-

void GLWidgetdrag::startDrag(Qt::DropActions supportedActions)
{
QListWidgetItem* item = currentItem();
QMimeData* mimeData = new QMimeData;
QByteArray ba;
ba = item->text().toLatin1().data();
mimeData->setData("application/x-item", ba);
QDrag* drag = new QDrag(this);
drag->setMimeData(mimeData);
if (drag->exec(Qt::MoveAction) == Qt::MoveAction) {
	/*delete takeItem(row(item));
	emit itemDroped();*/
}
}

Still Here showing this one error " QListWidgetItem* item = currentItem(); "

[VRonin]

Its showing selectIndex() is undefined.

yes, sorry, I forgot 1 call, it's selectionModel()->selectedIndexes(), corrected now. I have no idea what you are trying to do in your implementation

[amarism]

@VRonin Again its showing error:

[VRonin]

That method should go in a subclass of QListWidget

[amarism]

This post is deleted!

[amarism]

@VRonin said in How to get item after drag item from QListWidget Thumbnails:

auto isNotDragEnabled = [this](const QModelIndex &index) {
return !isIndexDragEnabled(index);
};

showing error in this line " !isIndexDragEnabled(index) "