Drag and drop to a Pushbutton

[dencla]

@JonB It does not have a direct reason for drag and drop. When I was working on my CustomSqlTableView drag and drop works when I called it directly in the example but when I tried to promote it to a CustomSqlTableView it does not display in a ui->table view, but a CustomQueryModel does, but does not work.

So I'm back to figuring out why, so I can drag to a pushbutton. Which is why i need the display.

Thanks for you help. It is taking me farther down the road.

[dencla]

@JonB It was a typo sorry. I figured it out. On to the pushbutton.

[dencla]

@JonB I can Drag and drop from a ui->tableView, now I need to drop to a CustomPushButton. I have promoted a ui->QPushButton to a ui->CustomPushButton. When I drag the drop indicator goes away and the drop fails. I am not sure what triggers the event.

Below is the code for the CustomPushButton::

#include <QPushButton>
#include <QMimeData>
#include <QDataStream>
#include <QDropEvent>
 
class CustomPushButton : public QPushButton {
public:
    CustomPushButton(QWidget *parent = nullptr) : QPushButton(parent) {
        setAcceptDrops(true);
    }

    // Override the virtual method to handle drop events
    void dropEvent(QDropEvent *event) override {
        const QMimeData *mimeData = event->mimeData();
        if (mimeData && mimeData->hasText()) {
            setText(mimeData->text());
            event->acceptProposedAction();
        }
    }
};

Any Ideas

[SGaist]

@dencla you also need to implement the dragEnterEvent and dragMoveEvent methods as they handle the dragging until you drop.

[dencla]

@SGaist OK I'll give that a shot.
Thanks

[dencla]

@SGaist This is what I have now. It still does not register the drag on the CustomPushButton.

#include <QPushButton>
#include <QMimeData>
#include <QDataStream>
#include <QDropEvent>
#include <QDebug>

class CustomPushButton : public QPushButton {
public:
    CustomPushButton(QWidget *parent = nullptr) : QPushButton(parent) {
        setAcceptDrops(true); // Enable drop events for the push button
    }

protected:
    void dragEnterEvent(QDragEnterEvent *event) override {
        if (event->mimeData()->hasFormat("application/vnd.text.list"))
            event->accept();
        else
            event->ignore();
    }

    void dragMoveEvent(QDragMoveEvent *event) override {
        if (event->mimeData()->hasFormat("application/vnd.text.list")) {
            event->setDropAction(Qt::CopyAction);
            event->accept();
        } else {
            event->ignore();
        }
    }

    void dropEvent(QDropEvent *event) override {
        const QMimeData *mimeData = event->mimeData();
        if (!mimeData->hasFormat("application/vnd.text.list")) {
            event->ignore();
            return;
        }

        QByteArray encodedData = mimeData->data("application/vnd.text.list");
        QDataStream stream(&encodedData, QIODevice::ReadOnly);

        QStringList items;
        while (!stream.atEnd()) {
            QString text;
            stream >> text;
            items.append(text);
        }

        qDebug() << "Dropped Items:" << items;

        // Perform actions based on the dropped items
        if(items.size() > 0) {
            setText(items.at(0));
            qDebug() << "inserted data";
        }
        // Call the base class implementation to handle other drop events
        QPushButton::dropEvent(event);
    }
};

[SGaist]

@dencla are you sure your overrides are called ?

[dencla]

@SGaist No I do't think they are, but I'm not sure. I will trace through the program but I don't think I will see anything. What would cause that. I am on ios apple mini.

[dencla]

@SGaist It definitely is not calling them.

[dencla]

@SGaist I recompiled the project in Linux and it works.
I don't know why it doesn't work on my apple computer.

Thanks

[SGaist]

@dencla which version of macOS are you using ?

[dencla]

@SGaist macOS Monterey 12.7.2

[SGaist]

@dencla I tested on Ventura with both 5.15.2 and 6.7.0 and your code is working. I just changed the mime type to handle plain text for testing and it's working as expected.