当前位置：网站首页>Qt 两个重载QListWidget控件对象实现selectitem drag拖拽

Qt 两个重载QListWidget控件对象实现selectitem drag拖拽

2022-07-17 13:41:00 【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){//按下的不是鼠标左键
       
        return;
       
    }
       
    start = event->pos();
       
    QListWidget::mousePressEvent(event);
       
}
       
void myListWidget::mouseMoveEvent(QMouseEvent *event)
       
{
       
    qDebug()<<"mouseMoveEvent";
       
    if(event->buttons() & Qt::LeftButton){//按下的是鼠标左键
       
        //判断拖动的长度大于起始长度才认为是拖动,否则不做拖动
       
        int distance = (event->pos() - start).manhattanLength();
       
        if(distance >= QApplication::startDragDistance()){
       
            //获取当前被选中的值
       
            current_item = this->currentItem();
       
            if(current_item){
       
                //准备需要传送的数据
       
                QMimeData * mimedata = new QMimeData();
       
                mimedata->setText(current_item->text());
       
                //test = current_item->text();
       
                //准备传送的对象
       
                QDrag* drag = new QDrag(this);
       
                drag->setMimeData(mimedata);
       
                //1.1 设置drag对象的图标,拖拽时显示的图标
       
                drag->setPixmap(QPixmap(":/new/prefix1/stop.png"));
       
                //1.2进行拖动操作
       
                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());
       
    //判断是否位空,判断自己是为自己
       
    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());
       
    //判断是否位空,判断自己是为自己
       
    if(source!=NULL && (source!=this)){
       
        event->setDropAction(Qt::MoveAction);
       
        event->accept();
       
    }
       
}
       
void myListWidget::dropEvent(QDropEvent *event)
       
{
       
    QListWidget* source = qobject_cast<QListWidget*>(event->source());
       
    //判断是否为空,判断是否自身为空
       
    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();
       
    }
       
}
      
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
83.
84.
85.
86.
87.
88.
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
103.
104.
105.
106.
107.
108.
109.
110.
111.
112.
113.
114.
115.
116.
117.
118.
119.
120.
121.
122.
123.
124.
125.
原网站
版权声明
本文为[51CTO]所创，转载请带上原文链接，感谢
https://blog.51cto.com/u_14123985/5479882
当前位置：网站首页>Qt 两个重载QListWidget控件对象实现selectitem drag拖拽

Qt 两个重载QListWidget控件对象实现selectitem drag拖拽

边栏推荐

猜你喜欢

随机推荐
