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QT two overloaded qlistwidget control objects implement selectitem drag drag

2022-07-19 11:04:00 【51CTO】

       
       #include <QListWidget>
       
#include <QWidget>
       
#include <QMimeData>
       
#include <QDrag>
       
#include <QMouseEvent>
       
#include <QDragEnterEvent>
       
#include <qDebug>
       
#include <QApplication>
       
class myListWidget : public QListWidget
       
{
       
    Q_OBJECT
       
public:
       
    explicit myListWidget(QWidget *parent = nullptr);
       
protected:
       
    void mousePressEvent(QMouseEvent *event);
       
    void mouseMoveEvent(QMouseEvent *event);
       
    void dragEnterEvent(QDragEnterEvent *event);
       
    void dragMoveEvent(QDragMoveEvent *event);
       
    void dropEvent(QDropEvent *event);
       
    void InitMyListWidget();
       
private:
       
    QListWidgetItem * current_item;
       
    QPoint start;
       
};
       
myListWidget::myListWidget(QWidget *parent) : QListWidget(parent)
       
{
       
    this->setAcceptDrops(true);
       
    current_item = NULL;
       
}
       
void myListWidget::mousePressEvent(QMouseEvent *event)
       
{
       
    qDebug()<<"mousePressEvent";
       
    if(event->button() != Qt::LeftButton){// The left mouse button is not pressed 
       
        return;
       
    }
       
    start = event->pos();
       
    QListWidget::mousePressEvent(event);
       
}
       
void myListWidget::mouseMoveEvent(QMouseEvent *event)
       
{
       
    qDebug()<<"mouseMoveEvent";
       
    if(event->buttons() & Qt::LeftButton){// Press the left mouse button 
       
        // It is considered as dragging only when the length of dragging is greater than the starting length , Otherwise, do not drag 
       
        int distance = (event->pos() - start).manhattanLength();
       
        if(distance >= QApplication::startDragDistance()){
       
            // Get the currently selected value 
       
            current_item = this->currentItem();
       
            if(current_item){
       
                // Prepare the data to be transmitted 
       
                QMimeData * mimedata = new QMimeData();
       
                mimedata->setText(current_item->text());
       
                //test = current_item->text();
       
                // The object to be transferred 
       
                QDrag* drag = new QDrag(this);
       
                drag->setMimeData(mimedata);
       
                //1.1  Set up drag Icon of the object , Icon displayed when dragging 
       
                drag->setPixmap(QPixmap(":/new/prefix1/stop.png"));
       
                //1.2 Do the drag operation 
       
                if(Qt::MoveAction == drag->exec(Qt::MoveAction)){
       
                    delete current_item;
       
                }
       
                QListWidget::mouseMoveEvent(event);
       
            }
       
        }
       
    }
       
}
       
void myListWidget::dragEnterEvent(QDragEnterEvent *event)
       
{
       
    qDebug()<<"dragEnterEvent";
       
    QListWidget* source  = qobject_cast<QListWidget*>(event->source());
       
    // Determine whether the bit is empty , Judge yourself for yourself 
       
    if(source!=NULL && (source!=this)){
       
        event->setDropAction(Qt::MoveAction);
       
        event->accept();
       
    }
       
}
       
void myListWidget::dragMoveEvent(QDragMoveEvent *event)
       
{
       
    qDebug()<<"dragMoveEvent";
       
    QListWidget* source  = qobject_cast<QListWidget*>(event->source());
       
    // Determine whether the bit is empty , Judge yourself for yourself 
       
    if(source!=NULL && (source!=this)){
       
        event->setDropAction(Qt::MoveAction);
       
        event->accept();
       
    }
       
}
       
void myListWidget::dropEvent(QDropEvent *event)
       
{
       
    QListWidget* source = qobject_cast<QListWidget*>(event->source());
       
    // Determine whether it is null , Determine whether it is empty 
       
    if(source != NULL && source != this){
       
        QList<QListWidgetItem*>  it = source->selectedItems();
       
        //QString str = event->mimeData()->text();
       
        //QListWidgetItem * l1 = new QListWidgetItem(QIcon(":/new/prefix1/video-ok.png"),str);
       
        QListWidgetItem * l1 = new QListWidgetItem(*it.front());//
       
        this->addItem(l1);
       
        this->setCurrentItem(l1);
       
        event->setDropAction(Qt::MoveAction);
       
        event->accept();
       
    }
       
}
      
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QT two overloaded qlistwidget control objects implement selectitem drag drag

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