QtTreeWidget: issue with indicator display

[Spitfire]

QTreeWidget* tree = new QTreeWidget( this );
tree->setDragEnabled( true );
tree->setAcceptDrops( true );
tree->setDropIndicatorShown( true );
tree->setDefaultDropAction( Qt::MoveAction ); // that's what you need

QTreeWidget* tree = new QTreeWidget( this );
tree->setDragEnabled( true );
tree->setAcceptDrops( true );
tree->setDropIndicatorShown( true );
tree->setDefaultDropAction( Qt::MoveAction ); // that's what you need

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This should do it. No need to set setDragDropMode() as setDragEnabled() and setAcceptDrops() do it for you.

[gjaegy]

Hi, thanks for your answer.

The problem is that calling

setDefaultDropAction( Qt::MoveAction );

setDefaultDropAction( Qt::MoveAction );

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leads to the following behaviour: I can't insert my items between two existing nodes anymore (indicator=line), all I can do is to move the item as a child (indicator=rectangle). Does that make sense ?

Moving/copying by inserting the item between two existing items was possible before.

Any idea ?

[Spitfire]

What you mean you can't insert the items?
Does the line indicator appear but nothing happens?

This works fine for me:

MainWindow::MainWindow( QWidget* p )
    :
    QMainWindow( p )
{
    QTreeWidget* tree = new QTreeWidget( this );
    tree->setDragEnabled( true );
    tree->setAcceptDrops( true );
    tree->setDropIndicatorShown( true );
    tree->setDefaultDropAction( Qt::MoveAction );
 
    for( int i = 0; i < 5; i++ )
    {
        QTreeWidgetItem* root = new QTreeWidgetItem( tree->invisibleRootItem() );
        root->setText( 0, "root" + QString::number( i ) );
 
        for( int j = 0; j < 5; ++j )
        {
            QTreeWidgetItem* leaf = new QTreeWidgetItem( root );
            leaf->setText( 0, "Leaf " + QString::number( j ) );
        }
    }
 
    this->setCentralWidget( tree );
}

MainWindow::MainWindow( QWidget* p )
    :
    QMainWindow( p )
{
    QTreeWidget* tree = new QTreeWidget( this );
    tree->setDragEnabled( true );
    tree->setAcceptDrops( true );
    tree->setDropIndicatorShown( true );
    tree->setDefaultDropAction( Qt::MoveAction );

    for( int i = 0; i < 5; i++ )
    {
        QTreeWidgetItem* root = new QTreeWidgetItem( tree->invisibleRootItem() );
        root->setText( 0, "root" + QString::number( i ) );

        for( int j = 0; j < 5; ++j )
        {
            QTreeWidgetItem* leaf = new QTreeWidgetItem( root );
            leaf->setText( 0, "Leaf " + QString::number( j ) );
        }
    }

    this->setCentralWidget( tree );
}

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See if this example has the same issue you're experiencing.
You may need to upgrade it to use mime types, if you do and are able to replicate the issue - post the code here.

[gjaegy]

OK, your example worked for me.
I have managed to fix my issue: actually the widget was being defined using Qt Designer, where some properties were set for that widget.
So, basically, to avoid confusion I've cleared all the properties defined in Qt Designer, and this seems to work now.

I think I now rather owe you a barrel of beer

Thanks a lot for your help, that was really appreciated.

[Spitfire]

I'm glad I could help.

Take care!