Add drop file support

imagescrollareagl.cpp

@@ -6,6 +6,7 @@
 #include <QOpenGLPixelTransferOptions>
 #include <QOpenGLFramebufferObject>
 #include <QGridLayout>
+#include <QMimeData>
 
 struct RawImageType
 {
@@ -54,6 +55,7 @@ ImageWidget::ImageWidget(QWidget *parent) : QOpenGLWidget(parent)
     m_range = UINT16_MAX;
     m_imgWidth = m_imgHeight = -1;
     m_superpixel = m_invert = false;
+    setAcceptDrops(true);
 }
 
 ImageWidget::~ImageWidget()
@@ -256,6 +258,29 @@ void ImageWidget::initializeGL()
     m_transferOptions->setAlignment(1);
 }
 
+void ImageWidget::dragEnterEvent(QDragEnterEvent *event)
+{
+    if(event->mimeData()->hasUrls() && event->proposedAction() & (Qt::CopyAction | Qt::MoveAction))
+        event->acceptProposedAction();
+}
+
+void ImageWidget::dropEvent(QDropEvent *event)
+{
+    if(event->mimeData()->hasUrls() && event->proposedAction() & (Qt::CopyAction | Qt::MoveAction))
+    {
+        for(const QUrl &url : event->mimeData()->urls())
+        {
+            if(url.isLocalFile())
+            {
+                emit fileDropped(url.path());
+                event->accept();
+                return;
+            }
+        }
+    }
+    event->ignore();
+}
+
 ImageScrollAreaGL::ImageScrollAreaGL(QWidget *parent) : QWidget(parent)
 {
     QGridLayout *layout = new QGridLayout(this);