Trying to implement a drop function on a QFrame, help please!

[fabriciokash]

In the mainwindow.ui file, the Qframe that I need to enable the drop function is organized as follows:

MainWindow(QMainWindow) -> centralwidget(QWidget) -> stackedWidget(QStackedWidget) -> page3(QWidget) -> frame_12(QFrame) -> frame_17(Qframe).

The last one, frame_17, is the frame where i need to drop zip files. Trying to figure out in internet how to do it, I did this:

/_____________________________________________
dropimages.h

#ifndef DROPIMAGES_H
#define DROPIMAGES_H

#include <QWidget>
#include <QFrame>

class DropImages : public QFrame
{

public:
    explicit DropImages(QWidget *parent = nullptr);

protected:
    void dragEnterEvent(QDragEnterEvent *event) override;

    void dragMoveEvent(QDragMoveEvent *event) override;

    void dropEvent(QDropEvent *event) override;
};

#endif // DROPIMAGES_H

/_____________________________________________

dropimages.cpp

#include "dropimages.h"

#include <QDrag>
#include <QDragEnterEvent>
#include <QMimeData>

DropImages::DropImages(QWidget *parent)
    : QFrame(parent)
{
    setAcceptDrops(true);
}

void DropImages::dragEnterEvent(QDragEnterEvent *event)
{
    printf("cccccc\n"); // for test
    event->accept();
    if(event->mimeData()->hasUrls())
        event->acceptProposedAction();
}

void DropImages::dragMoveEvent(QDragMoveEvent *event)
{
    printf("bbbb\n"); // for test
    event->accept();
    if(event->mimeData()->hasUrls())
    {
        event->acceptProposedAction();
    }
}

void DropImages::dropEvent(QDropEvent *event)
{
    printf("aaaaaa\n"); // for test
    event->accept();
    if(event->mimeData()->hasUrls())
    {
        foreach(QUrl url, event->mimeData()->urls())
        {
            printf(url.toLocalFile().toStdString().c_str());
        }
    }
}

/_____________________________________________

mainwindow.cpp

inside class implementation:
DropImages *uploadedImages = new DropImages(ui->frame_17);

/_____________________________________________

But nothing is working. Can someone help me please?

[JonB]

@fabriciokash said in Trying to implement a drop function on a QFrame, help please!:

But nothing is working

Do you mean none of these methods are hit?

MainWindow(QMainWindow) -> centralwidget(QWidget) -> stackedWidget(QStackedWidget) -> page3(QWidget) -> frame_12(QFrame) -> frame_17(Qframe).

You say frame_12 is a QFrame (perhaps created in Designer?). But your class is DropImages, derived from QFrame. So this would be a third frame level? May I suggest you start by, say, setting the background color of your DropImages to red so that you can at least it is there and what area it covers?

[fabriciokash]

@JonB said in Trying to implement a drop function on a QFrame, help please!:

Do you mean none of these methods are hit?

You say frame_12 is a QFrame (perhaps created in Designer?). But your class is DropImages, derived from QFrame. So this would be a third frame level? May I suggest you start by, say, setting the background color of your DropImages to red so that you can at least it is there and what area it covers?

Yes, these methods was not working. But i found the enabled area using your suggestion and after tried to drop a file, it works! Thank you! I was trying to drop into a wrong area...

But I found another problem. After setting the background area color, only part of the frame was painted red. This means that only this part of the frame is enabled to drop files. This part is a rectangle in the upper left corner of the frame and reduced in size. While the frame size is (800,200), the red colored part is about (120, 40) size. Can you help me with this problem?

[JonB]

@fabriciokash
Since the frame is empty (has no content) I would guess it could be any size. I guess you could set a fixed size, or minimum sizes, or presumably best check its sizePolicy, you want it to fill its parent, I don't know what that is for a QFrame.

[Pl45m4]

@fabriciokash

Have a look at this topic and my replies there.
It seems that you don't create a QDrag object which will transfer the mime data.

[JonB]

@Pl45m4
I have never done d&d. Your post is for QGraphicsScene, I presume what you said there about QDrag object is just as relevant here? [You wrote "QDrop object" above, but you meant QDrag, right?]

I came across Qt's Drop Site Example. Is that relevant for @fabriciokash ? That doesn't seem to use any QDrag object, yet it's handling MIME data, is it a different approach from yours?

[fabriciokash]

@Pl45m4

Thanks for suggestion! But for while thats all i need in this moment. I'll see the topic and learn about, thanks.

@JonB

I fixed that too, got it! haha. I just used the method setFixedSize. its all i need at the moment, thanks!