增加拖放文件功能

mainwindow.cpp

@@ -13,6 +13,8 @@ MainWindow::MainWindow(QWidget *parent)
 {
     ui->setupUi(this);
 
+    setAcceptDrops(true); // 允许窗口接受拖放事件
+
     connect(ui->actionOpen, &QAction::triggered, this, &MainWindow::onOpenButtonClicked);
     connect(ui->actionSave, &QAction::triggered, this, &MainWindow::onSaveButtonClicked);
 }
@@ -156,3 +158,28 @@ void MainWindow::onSaveButtonClicked()
         }
     }
 }
+
+void MainWindow::dragEnterEvent(QDragEnterEvent *event)
+{
+    if (event->mimeData()->hasUrls())
+    {
+        event->acceptProposedAction();
+    }
+}
+
+void MainWindow::dropEvent(QDropEvent *event)
+{
+    const QMimeData* mimeData = event->mimeData();
+    if (mimeData->hasUrls())
+    {
+        QList<QUrl> urlList = mimeData->urls();
+        if (urlList.length() == 1)
+        {
+            QString fileName = urlList.first().toLocalFile();
+            if (!fileName.isEmpty())
+            {
+                loadTextFile(fileName);
+            }
+        }
+    }
+}

mainwindow.h

@@ -5,6 +5,8 @@
 #include <QThread>
 #include <QMainWindow>
 #include <QTableWidget>
+#include <QDragEnterEvent>
+#include <QMimeData>
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
@@ -18,6 +20,8 @@ public:
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
     void loadTextFile(const QString& fileName);
+    void dragEnterEvent(QDragEnterEvent *event);
+    void dropEvent(QDropEvent *event);
 
 private slots:
     void onOpenButtonClicked();