[solved]How could I drop external items into QTableView?

stereomatchingkiss

Trying to drop some external files into the tableview with no avail. Following are the examples after simplify

At first, I override dragEnterEvent and dropEvent of the QTableView

dropAbleTableView.hpp

#include <QTableView>

class dropAbleView : public QTableView
{
public:
    dropAbleView(QWidget *parent = nullptr);
    ~dropAbleView();

protected:
    void dragEnterEvent(QDragEnterEvent *event);
    void dropEvent(QDropEvent *event);
};

dropAbleTableView.cpp

#include <QDebug>
#include <QDragEnterEvent>
#include <QDropEvent>

#include "dropAbleView.hpp"

dropAbleView::dropAbleView(QWidget *parent) :
    QTableView(parent)
{

}

dropAbleView::~dropAbleView()
{

}

void dropAbleView::dragEnterEvent(QDragEnterEvent *event)
{
    qDebug()<<__FUNCTION__;
    event->acceptProposedAction();
}

void dropAbleView::dropEvent(QDropEvent *event)
{
    qDebug()<<__FUNCTION__;
    event->acceptProposedAction();
}

According to the document, this is not enough, I have to override model too, to simplify the example, I use QStandrdItemModel

#include <QStandardItemModel>

class standardModel : public QStandardItemModel
{
public:
    standardModel(QObject *parent = nullptr);
    ~standardModel();

    bool canDropMimeData(const QMimeData *data,
    Qt::DropAction action, int row, int column, const QModelIndex &parent) const override;

    bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column,
                            const QModelIndex &parent);

    Qt::ItemFlags flags(const QModelIndex &index) const override;

    Qt::DropActions supportedDropActions() const override;
};

standardModel.cpp

#include <QDebug>
#include "standardModel.hpp"

standardModel::standardModel(QObject *parent) :
    QStandardItemModel(parent)
{
     setHorizontalHeaderItem(0, new QStandardItem(tr("String")));
}

standardModel::~standardModel()
{

}

bool standardModel::canDropMimeData(const QMimeData*, Qt::DropAction, int, int, const QModelIndex&) const
{
     qDebug()<<__FUNCTION__;
     return true;
}

bool standardModel::dropMimeData(const QMimeData*, Qt::DropAction, int, int, const QModelIndex&)
{
    qDebug()<<__FUNCTION__;
    return true;
}

main.cpp

#include "dropAbleView.hpp"
#include "standardModel.hpp"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    dropAbleView view;
    view.setAcceptDrops(true);
    view.setDropIndicatorShown(true);

    standardModel model;
    model.appendRow(new QStandardItem("abcde"));
    view.setModel(&model);
    view.show();

    return a.exec();
}

However, no matter how hard I try, I cannot drop the item, the dropEvent of the dropAbleView never called, but the dragEnterEvent always called when I drag something into the view.

The location (github)of the example(can compile and run )

What do I lack to make it accept the items(text, files, folder etc) I drop?Thank you

Jeroentjehome

Hi,
Fixed it for you. You need to encapsulate your View into a MAinWindow or some other form of Widget that will control a window border/view etc I suppose.
Then the drag/drop events are called in my debugger.
Check out your main.cpp now.

#include "dropAbleView.hpp"
#include "standardModel.hpp"
#include <QApplication>
#include <QMainWindow>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

QMainWindow MyWindow;
MyWindow.setAcceptDrops(true);

dropAbleView view;
view.setAcceptDrops(true);
view.setDropIndicatorShown(true);

standardModel model;
model.appendRow(new QStandardItem("abcde"));
view.setModel(&model);
view.show();

MyWindow.setCentralWidget(&view);

MyWindow.show();
return a.exec();
}

stereomatchingkiss

@Jeroentjehome
Thanks for your helps. I replace the main.cpp with your codes and run again, but the dropEvent still cannot called(drag event still work)

I update the main.cpp on github,

stereomatchingkiss

Find out the answer, to get the dropEvent of dropAbleView be called, I need to override the model function
"QStringList mimeTypes() const" and "bool dropMimeData(const QMimeData*, Qt::DropAction, int, int, const QModelIndex&)"

you can check the working version from github