QT drag event

1、 How to make qt The interface recognizes the dragged file ？

Add the following code to the interface constructor

setAcceptDrops(true);// Set drag-and-drop support 

In this way, drag the file to Qt Program interface , It will trigger Qt Drag events for ;

2、 How to handle the operation of dragging files

QWidget Class and inheritance QWidget Subclasses of , You can rewrite drag events through the defined virtual function interface . These four related virtual functions are

void dragEnterEvent(QDragEnterEvent *event); // Drag into Qt Triggered when the desktop control 
void dragMoveEvent(QDragMoveEvent *event);   // Drag on Qt Triggered when moving within the desktop control 
void dragLeaveEvent(QDragLeaveEvent *event); // Drag away Qt Triggered when the desktop control 
void dropEvent(QDropEvent *event);           // Put down the file in Qt Triggered when the desktop control 

void Widget::dragEnterEvent(QDragEnterEvent *event)
{
    
    qDebug()<<event->type();
       if (event->mimeData()->hasFormat("text/uri-list"))  // Determine if it's a document 
    {
    
        event->acceptProposedAction();
    }
}

void Widget::dragMoveEvent(QDragMoveEvent *event)
{
    
    qDebug()<<event->type();
}

void Widget::dragLeaveEvent(QDragLeaveEvent *event)
{
    
    qDebug()<<event->type();
}

void Widget::dropEvent(QDropEvent *event)
{
    
    qDebug()<<event->type();
    QList<QUrl> urls = event->mimeData()->urls();
    qDebug()<<urls;
    setText(urls[0].toString());
}

As you can see from the code , Drag files to Qt Control , Not only a single file is supported , It also supports dragging and dropping multiple files , Through the code above , Pass the path of the dragged file to Qt Control .