QDropEvent

[addu]

Hi All

i am facing the same QTreeWidget Drag and Drop issue since last 1.5 weeks..

I am feeling this is very bad me..

My problem is How can i set top level items only has to accepts drops.

I set following things

ui->widget->dragDropOverwriteMode();
ui->treeWidget->setDragEnabled(true);
ui->treeWidget->setAcceptDrops(true);
ui->treeWidget->setDragDropMode(QAbstractItemView ::InternalMove);


I know answer is very simple, But i don't know how do compare the Drop Event with top level items ...

please help me to sort out this issue..

Any suggestions welcome.

Thanks

Addu R

[wysota]

Use QTreeWidgetItem::setFlags().

[addu]

Dear wysota

Thanks for your reply..

I enabled the Drop action only for top level items by

QTreeWidgetItem * friends = new QTreewidgetItem(ui->treeWidget);

freinds->setFlags(Qt::Items is Drop Enabled);

but same thing all items are accepting the drops...

And one more thing dafter dropping the any one item to friends ,it behaving like child item


Thanks

Addu R

[wysota]

Make sure InternalMove is disabled. If that doesn't help, please provide a minimal compilable example reproducing the problem.

[addu]

Previously i used the internalmove mode, Then i changed to DragDrop mode.. But it is not working for me ..

sample code

ui->treeWidget->dragDropOverwriteMode();
       ui->treeWidget->setDragEnabled(true);
       ui->treeWidget->setAcceptDrops(true);
      ui->treeWidget->setDragDropMode(QAbstractItemView ::DragDrop);
QTreeWidgetItem  *item = new QTreeWidgetItem(ui->treeWidget);
 item->setText(0,"Friends");
QList <QString > list;
list << tr("john") << tr("joseph") << tr("stephen") << tr("raj") << tr("Addu") ;
 
for ( int i=0;i < list.size;i++)
{
     QTreeWidgetItem *new_item = new QTreeWidgetItem(item);
        new_item->setText(0,list.at(i));
 }

ui->treeWidget->dragDropOverwriteMode();
       ui->treeWidget->setDragEnabled(true);
       ui->treeWidget->setAcceptDrops(true);
      ui->treeWidget->setDragDropMode(QAbstractItemView ::DragDrop);
QTreeWidgetItem  *item = new QTreeWidgetItem(ui->treeWidget);
 item->setText(0,"Friends");
QList <QString > list;
list << tr("john") << tr("joseph") << tr("stephen") << tr("raj") << tr("Addu") ;

for ( int i=0;i < list.size;i++)
{
     QTreeWidgetItem *new_item = new QTreeWidgetItem(item);
        new_item->setText(0,list.at(i));
 }

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Again i am creating new top level item for TreeWidget

QTreeWidgetItem  *colleages  = new QTreeWidgetItem(ui->treewidget);
      colleages->setText(0,"co-Workers");

QTreeWidgetItem  *colleages  = new QTreeWidgetItem(ui->treewidget);
      colleages->setText(0,"co-Workers");

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I am trying to drag the items from friends to co-workers .. Here top level item only accept the drops..child items won't accept the drops.


How do i sort out this issue


Thanks

Addu R

[wysota]

Ok, but how do you set the flags and how do you handle the drop itself?

[addu]

I set the flags only for top level items ..

item->setFlag(Qt::ItemisDropEnabled);
colleages->setFlag(Qt::ItemisDropEnabled);
new_item->setFlag(Qt::Itemis DragEnabled);

item->setFlag(Qt::ItemisDropEnabled);
colleages->setFlag(Qt::ItemisDropEnabled);
new_item->setFlag(Qt::Itemis DragEnabled);

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Previoused i over ride the DropEvent function..
But if i set the ui->treeWidget->setAcceptDrops(true),DropEvent function was not called ..

So I commented the DropEvent function..

And i did like this

void MainWindow::dropEvent(QDropEvent *event)
{
     ui->treeWidget->setDropEvent(event) //  Here Application is crashing
 
   }

void MainWindow::dropEvent(QDropEvent *event)
{
     ui->treeWidget->setDropEvent(event) //  Here Application is crashing

   }

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Where i have done mistake,please correct me, i know problem is at DropEvent function..

please help me to clear this issue

Thanks

Addu R

[wysota]

The mistake you did was that you didn't bother to look into the documentation.

QTreeWidget::dropMimeData()

[addu]

Dear Wysota..

Thanks for your valuable solution.

I implemented the following function

void MainWindow::dragEnterEvent(QDragEnterEvent *eve)
{
    qDebug() << "Drag enter event";
    eve->accept();
 
}
void MainWindow::dragMoveEvent(QDragMoveEvent *e)
{
 
    qDebug() << "Drag move event";
    e->accept();
}
bool MainWindow::dropMimeData(QTreeWidgetItem *parent, int index, const QMimeData *data, Qt::DropAction action)
{
    QMessageBox::information(0,"",QString("Addu"));
}

void MainWindow::dragEnterEvent(QDragEnterEvent *eve)
{
    qDebug() << "Drag enter event";
    eve->accept();

}
void MainWindow::dragMoveEvent(QDragMoveEvent *e)
{

    qDebug() << "Drag move event";
    e->accept();
}
bool MainWindow::dropMimeData(QTreeWidgetItem *parent, int index, const QMimeData *data, Qt::DropAction action)
{
    QMessageBox::information(0,"",QString("Addu"));
}

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but complier is not going to dropMimeData function

[wysota]

Because you still didn't bother to look into the docs. This time I will not give you a pointer but instead you're given a classic RTFM. I'll give you a hint though - you want to read about performing drag and drop with Item Views.

[addu]

Wysota

i have gone through the below link

http://www.qtsoftware.com/developer/...-23.4700087965..

same thing only i followed ...please i request you provide me one sample example


Thanks

Addu R