How QT implements multi-file drag and drop to obtain the path

Function

Drag and drop multiple files into the interface to display the path of the files.

accomplish

1. Enable form drop operation

this->setAcceptDrops(true);//启用放下操作

2. Rewrite the dragEnterEvent() function to filter drag events

void dragEnterEvent(QDragEnterEvent *e);

void MainWindow::dragEnterEvent(QDragEnterEvent *e)
{
    //对拖放事件进行筛选
    if (true)
    {
        e->acceptProposedAction();    //放行，否则不会执行dropEvent()函数
    }
}

3. Rewrite the dropEvent() function to handle drag events

void dropEvent(QDropEvent *e);

void MainWindow::dropEvent(QDropEvent *e)
{
    QList<QUrl> urls = e->mimeData()->urls();
    if(urls.isEmpty())
        return ;
    qDebug()<< urls.size();
    foreach (QUrl u, urls)
    {
        QString filepath = u.toLocalFile();
        pathlist.append(filepath);
    }
}

4. Remove duplicate files

QList stores the file path. Since Qset has no duplicates, it can be converted to set first, and then converted back to list.

pathlist = pathlist.toSet().toList();

Effect

UI layout

 

final effect

 

source code

head File

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QTextEdit>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
protected:
    void dragEnterEvent(QDragEnterEvent *e);
    void dropEvent(QDropEvent *e);
 
private slots:
    void on_pushButton_upload_clicked();
 
private:
    Ui::MainWindow *ui;
    QList<QString> pathlist;
};
 
#endif // MAINWINDOW_H

Source File

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#include <QDragEnterEvent>
#include <QFile>
#include <QDebug>
#include <QMimeData>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    ui->textEdit->setAcceptDrops(false); //禁用控件的放下操作
    this->setAcceptDrops(true);//启用放下操作
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::dragEnterEvent(QDragEnterEvent *e)
{
    //对拖放事件进行筛选
    if (true)
    {
        e->acceptProposedAction();    //放行，否则不会执行dropEvent()函数
    }
}
 
void MainWindow::dropEvent(QDropEvent *e)
{
    QList<QUrl> urls = e->mimeData()->urls();
    if(urls.isEmpty())
        return ;
    qDebug()<< urls.size();
    foreach (QUrl u, urls)
    {
        QString filepath = u.toLocalFile();
        pathlist.append(filepath);
    }
    //去掉重复路径
    pathlist = pathlist.toSet().toList();
    ui->textEdit->clear();
    for(int i=0;i<pathlist.size();++i)
    {
        QString path = pathlist.at(i);
        ui->textEdit->append(path);
    }
}
 
 
void MainWindow::on_pushButton_upload_clicked()
{
    qDebug()<<pathlist;
}

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