qt拖拽事件简单实例

版权声明：未经博主允许，禁止转载 https://blog.csdn.net/Think88666/article/details/83012641

话不多说直接上代码，一看就懂

注意：当使用管理员权限运行qt creator时，程序可能无法检测到拖拽事件！

widget.h  文件

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
protected:
    virtual void dropEvent(QDropEvent *event) override;
    virtual void dragEnterEvent(QDragEnterEvent *event) override;
    virtual void dragLeaveEvent(QDragLeaveEvent *event) override;
    virtual void dragMoveEvent(QDragMoveEvent *event) override;
private:
    Ui::Widget *ui;
};

widget.cpp 文件

#include "widget.h"
#include "ui_widget.h"
#include <QDragEnterEvent>
#include <QDragLeaveEvent>
#include <QDragMoveEvent>


Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setAcceptDrops(true);
    ui->textEdit->setAcceptDrops(false);

}

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

void Widget::dropEvent(QDropEvent *event)
{
    ui->textEdit->setText("QDropEvent");

}

void Widget::dragEnterEvent(QDragEnterEvent *event)
{
    ui->textEdit->setText("QDragEnterEvent");
    //传递事件
    event->acceptProposedAction();
}

void Widget::dragLeaveEvent(QDragLeaveEvent *event)
{
    ui->textEdit->setText("QDragLeaveEvent");
}

void Widget::dragMoveEvent(QDragMoveEvent *event)
{
    ui->textEdit->setText("QDragMoveEvent");
    //通过设置Qt::DrogAction 可以修改拖动过程中默认显示的Copy
    /*
        enum DropAction {
        CopyAction = 0x1,
        MoveAction = 0x2,
        LinkAction = 0x4,
        ActionMask = 0xff,
        TargetMoveAction = 0x8002,
        IgnoreAction = 0x0
    };
    */
    event->setDropAction(Qt::MoveAction);
}