Qt - 将文件拖放到 ListView

Question

I am trying to write a simple program (nothing special) which has a QListView and some Buttons.

My question is: How do I specifically tell the QListView to accept Drag and Drop from the filesystem?

I currently have

setAcceptDrops(true)

Which is OK, but the drag and drop works on the whole (Main)Window. I just want it to work when the file is dragged into the QListView .

Why doesn't this work?:

ui->listView->setAcceptDrops(true);

The whole code:

#include "player.h"
#include "ui_player.h"
#include <QListView>

Player::Player(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Player)
{
    ui->setupUi(this);
    setAcceptDrops(true);
    //This doesnt work:
    //ui->listView->setAcceptDrops(true);
}

Player::~Player()
{
    delete ui;
}

void Player::dropEvent(QDropEvent *ev)
{
    QList<QUrl> urls = ev -> mimeData() -> urls();
    foreach(QUrl url, urls)
    {
        qDebug() << url.toString();
    }
    ev->acceptProposedAction();
}

void Player::dragEnterEvent(QDragEnterEvent *ev)
{
    ev->acceptProposedAction();
}

Answer 1

You should override these event functions for QListView , not QMainWindow . When you do ui->listView->setAcceptDrops(true); , QListView is now the widget that reacts to the drop events, by calling its virtual dropEvent and dragEnterEvent functions.

Make your own class that inherits QListView and define dropEvent and dragEnterEvent in there:

class MyListView
{
public:
    MyListView(QWidget *parent);                        // implement

protected:
    void dropEvent(QDropEvent *ev) override;            // implement
    void dragEnterEvent(QDragEnterEvent *ev) override;  // implement
};

You might also want to override dragMoveEvent as the reference says.