allowed to DnD file on window for easier testing

mainwindow.cpp

@@ -3,10 +3,13 @@
 
 #include <QImageReader>
 #include <QDebug>
+#include <QMimeData>
+#include <QMouseEvent>
 
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow)
+    , m_filePath(R"(E:\16bit-raw-argb-affinityphoto.psd)")
 {
     ui->setupUi(this);
 }
@@ -16,6 +19,31 @@ MainWindow::~MainWindow()
     delete ui;
 }
 
+void MainWindow::dragEnterEvent(QDragEnterEvent *event)
+{
+    if (event->mimeData()->hasUrls()) {
+        event->acceptProposedAction();
+    } else {
+        event->ignore();
+    }
+
+    return QMainWindow::dragEnterEvent(event);
+}
+
+void MainWindow::dropEvent(QDropEvent *event)
+{
+    event->acceptProposedAction();
+
+    const QMimeData * mimeData = event->mimeData();
+
+    if (mimeData->hasUrls()) {
+        const QList<QUrl> &urls = mimeData->urls();
+        if (!urls.isEmpty()) {
+            m_filePath = urls.first().toLocalFile();
+            ui->label->setText(m_filePath);
+        }
+    }
+}
 
 void MainWindow::on_pushButton_clicked()
 {
@@ -23,7 +51,7 @@ void MainWindow::on_pushButton_clicked()
     qDebug() << QImageReader::supportedImageFormats();
 
     // 后面的文件改成 psd 文件的路径
-    QScopedPointer< QImageReader> ir(new QImageReader(R"(E:\ff.psd)"));
+    QScopedPointer< QImageReader> ir(new QImageReader(m_filePath));
     qDebug() << ir->canRead();
     QImage read = ir->read();
     if (read.isNull()) {

mainwindow.h

@@ -15,10 +15,16 @@ public:
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
+protected:
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
+
 private slots:
     void on_pushButton_clicked();
 
 private:
     Ui::MainWindow *ui;
+
+    QString m_filePath;
 };
 #endif // MAINWINDOW_H

mainwindow.ui

@@ -10,36 +10,32 @@
     <height>600</height>
    </rect>
   </property>
+  <property name="acceptDrops">
+   <bool>true</bool>
+  </property>
   <property name="windowTitle">
    <string>MainWindow</string>
   </property>
   <widget class="QWidget" name="centralwidget">
-   <widget class="QLabel" name="label">
+   <layout class="QVBoxLayout" name="verticalLayout">
-    <property name="geometry">
+    <item>
-     <rect>
+     <widget class="QLabel" name="label">
-      <x>0</x>
+      <property name="text">
-      <y>0</y>
+       <string>TextLabel</string>
-      <width>801</width>
+      </property>
-      <height>561</height>
+      <property name="alignment">
-     </rect>
+       <set>Qt::AlignCenter</set>
-    </property>
+      </property>
-    <property name="text">
+     </widget>
-     <string>TextLabel</string>
+    </item>
-    </property>
+    <item>
-   </widget>
+     <widget class="QPushButton" name="pushButton">
-   <widget class="QPushButton" name="pushButton">
+      <property name="text">
-    <property name="geometry">
+       <string>Display Image</string>
-     <rect>
+      </property>
-      <x>0</x>
+     </widget>
-      <y>570</y>
+    </item>
-      <width>801</width>
+   </layout>
-      <height>24</height>
-     </rect>
-    </property>
-    <property name="text">
-     <string>PushButton</string>
-    </property>
-   </widget>
   </widget>
  </widget>
  <resources/>