QT 实现拖放功能

1. 文档拖放 获取文件名

mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QtGui>

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    MainWindow(QWidget *parent = 0);

protected:

    void dragEnterEvent(QDragEnterEvent *event);

    void dropEvent(QDropEvent *event);

private:

    bool readFile(const QString &fileName);

    QTextEdit *textEdit;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

{

    textEdit = new QTextEdit;

    setCentralWidget(textEdit);

    textEdit->setAcceptDrops(false);

    setAcceptDrops(true);

    setWindowTitle(tr("Drag test"));

}

void MainWindow::dragEnterEvent(QDragEnterEvent *event)

{

    if( event->mimeData()->hasFormat("text/uri-list") )

        event->acceptProposedAction();

}

void MainWindow::dropEvent(QDropEvent *event)

{

    QList<QUrl> urls = event->mimeData()->urls();

    if(urls.isEmpty())

        return;

    QString fileName = urls.first().toLocalFile();

    if(fileName.isEmpty())

        return;

    if(readFile(fileName))

        setWindowTitle(tr("%1-%2").arg(fileName).arg(tr("Drag File")));

}

bool MainWindow::readFile(const QString &fileName)

{

    bool r = false;

    QFile file(fileName);

    QTextStream in(&file);

    if( file.open(QIODevice::ReadOnly | QFile::Text) )

    {

        textEdit->setText(in.readAll());

        textEdit->append(fileName);

        r = true;

    }

    return r;

}