QMimeData problems between a QTableWidget and a QTreeWidget

[andreime]

Hello, i am trying to make it so when you drag from a table view to a tree view you can send some data and add an item to the tree view. I searched on the web and programmed something that i feel should work but, alas, it is not.
This is the treeview class.

Favorites::Favorites(QWidget *parent)
    : QTreeWidget(parent)
{
    //building the part for the favorites list
    QTreeWidgetItem* favoritesItem = new QTreeWidgetItem();
    favoritesItem->setText(0,"Favorites");
    this->addTopLevelItem(favoritesItem);
    favoritesItem->setExpanded(true);
    this->setDragDropMode(QAbstractItemView::DropOnly);
    this->setAcceptDrops(true);
    addPathToFavorites(QString("asdsadasd"));
    refreshFavorites();
}
 
void Favorites::dragEnterEvent(QDragEnterEvent* event){
    qDebug()<< event->mimeData()->text(); // just prints out ""
    if (event->mimeData()->hasText())
             event->acceptProposedAction();
}
 
void Favorites::dropEvent(QDropEvent *event){
    qDebug()<< event->mimeData()->text();
    addPathToFavorites(event->mimeData()->text());
}

Favorites::Favorites(QWidget *parent)
    : QTreeWidget(parent)
{
    //building the part for the favorites list
    QTreeWidgetItem* favoritesItem = new QTreeWidgetItem();
    favoritesItem->setText(0,"Favorites");
    this->addTopLevelItem(favoritesItem);
    favoritesItem->setExpanded(true);
    this->setDragDropMode(QAbstractItemView::DropOnly);
    this->setAcceptDrops(true);
    addPathToFavorites(QString("asdsadasd"));
    refreshFavorites();
}

void Favorites::dragEnterEvent(QDragEnterEvent* event){
    qDebug()<< event->mimeData()->text(); // just prints out ""
    if (event->mimeData()->hasText())
             event->acceptProposedAction();
}

void Favorites::dropEvent(QDropEvent *event){
    qDebug()<< event->mimeData()->text();
    addPathToFavorites(event->mimeData()->text());
}

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And this is the table

TableWidget::TableWidget(QWidget *parent)
    : QTableWidget(parent)
{
//i've enabled drag in the main class 
}
 
void TableWidget::mousePressEvent(QMouseEvent *event){
    if(event->button() == Qt::LeftButton)
        poss = event->pos();
    else { ;}
    QTableWidget::mousePressEvent(event);
}
 
void TableWidget::mouseMoveEvent(QMouseEvent *event){
    if(!event->buttons() & Qt::LeftButton)
        QTableWidget::mouseMoveEvent(event);
    else
    if((event->pos() - poss).manhattanLength() < QApplication::startDragDistance())
        QTableWidget::mouseMoveEvent(event);
    else{
        QTableWidgetItem *item = this->itemAt(event->pos());
        if(item){
            QDrag* drag = new QDrag(this);
            QMimeData* mimeData = new QMimeData;
            mimeData->setText(item->text());
            drag->setMimeData(mimeData);
            qDebug()<<drag->mimeData()->hasText()<<drag->mimeData()->text();//print's what it should
        }
        QTableWidget::mouseMoveEvent(event);
    }
}

TableWidget::TableWidget(QWidget *parent)
    : QTableWidget(parent)
{
//i've enabled drag in the main class 
}

void TableWidget::mousePressEvent(QMouseEvent *event){
    if(event->button() == Qt::LeftButton)
        poss = event->pos();
    else { ;}
    QTableWidget::mousePressEvent(event);
}

void TableWidget::mouseMoveEvent(QMouseEvent *event){
    if(!event->buttons() & Qt::LeftButton)
        QTableWidget::mouseMoveEvent(event);
    else
    if((event->pos() - poss).manhattanLength() < QApplication::startDragDistance())
        QTableWidget::mouseMoveEvent(event);
    else{
        QTableWidgetItem *item = this->itemAt(event->pos());
        if(item){
            QDrag* drag = new QDrag(this);
            QMimeData* mimeData = new QMimeData;
            mimeData->setText(item->text());
            drag->setMimeData(mimeData);
            qDebug()<<drag->mimeData()->hasText()<<drag->mimeData()->text();//print's what it should
        }
        QTableWidget::mouseMoveEvent(event);
    }
}

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What am I doing wrong? Any help will be greatly appreciated. Thank you.

[JohannesMunk]

Hi!

No time to look into it thoroughly. Aren't you missing drag->exec() ?

What happens when you drag some text from another source/application? That way you can separate source and destination problems..

If nothing works - Post a minimal compilable example, please!

HIH

Johannes

[andreime]

I am a bit shocked I missed that. It works now.
But I have a follow-up question: just by using drag->exec(), it works, but when I am over the place I want to drop the data, it shows a blocked-like icon(i can't take a screenshot of it); any ideas why this is happening? should i pass something in the exec method call ?
Thanks again for the help.

[JohannesMunk]

Thats a destination problem - should also happen, when you try tro drag text from let's say notepad..

You need to accept the drag in the dragMoveEvent, too.

void Favorites::dragMoveEvent(QDragMoveEvent* event)
{
  if (event->mimeData()->hasText())
  {
    event->accept();
  }  
  QTreeWidget::dragMoveEvent(event);
}

void Favorites::dragMoveEvent(QDragMoveEvent* event)
{
  if (event->mimeData()->hasText())
  {
    event->accept();
  }  
  QTreeWidget::dragMoveEvent(event);
}

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And call the inherited dragEnterEvent, also!

HIH

Johannes