From 0e51b8dde15bfe59437d6f351c516f4137faf631 Mon Sep 17 00:00:00 2001
From: Martino Pilia <martino.pilia@gmail.com>
Date: Tue, 11 Sep 2018 20:47:09 +0200
Subject: [PATCH] Open files by dropping them inside the window

Set the window to allow drag events entering it, and add an handler to
open files dropped within the window.
---
 vv/vvMainWindow.cxx | 22 ++++++++++++++++++++++
 vv/vvMainWindow.h   |  5 +++++
 2 files changed, 27 insertions(+)

diff --git a/vv/vvMainWindow.cxx b/vv/vvMainWindow.cxx
index 4e3ba21..153b461 100644
--- a/vv/vvMainWindow.cxx
+++ b/vv/vvMainWindow.cxx
@@ -18,6 +18,7 @@ It is distributed under dual licence
 
 #include <algorithm>
 #include <QMessageBox>
+#include <QMimeData>
 #include <QInputDialog>
 #include <QTimer>
 #include "QTreePushButton.h"
@@ -132,6 +133,8 @@ vvMainWindow::vvMainWindow():vvMainWindowBase()
 { 
   setupUi(this); // this sets up the GUI
 
+  setAcceptDrops(true); // enable to drop into the window
+
   setDicomClient();
 
   //Qt::WindowFlags flags = windowFlags();
@@ -816,6 +819,25 @@ void vvMainWindow::OpenRecentImage()
   LoadImages(images, vvImageReader::IMAGE);
 }
 //------------------------------------------------------------------------------
+void vvMainWindow::dragEnterEvent(QDragEnterEvent *event)
+{
+  if (event->mimeData()->hasUrls()) {
+    event->acceptProposedAction();
+  }
+}
+//------------------------------------------------------------------------------
+void vvMainWindow::dropEvent(QDropEvent *event)
+{
+  const QMimeData * mimeData = event->mimeData();
+  if (!mimeData->hasUrls())
+    return;
+  std::vector<std::string> images;
+  for (auto const & url : mimeData->urls()) {
+    images.push_back(url.toLocalFile().toStdString());
+  }
+  LoadImages(images, vvImageReader::IMAGE);
+}
+//------------------------------------------------------------------------------
 
 
 //------------------------------------------------------------------------------
diff --git a/vv/vvMainWindow.h b/vv/vvMainWindow.h
index 8908b24..2d6a21d 100644
--- a/vv/vvMainWindow.h
+++ b/vv/vvMainWindow.h
@@ -21,6 +21,7 @@
 
 #include <iostream>
 #include <vector>
+#include <QDropEvent>
 #include "ui_vvMainWindow.h"
 #include "vvMainWindowBase.h"
 #include "vvToolManager.h"
@@ -192,6 +193,10 @@ protected:
   void createRecentlyOpenedFilesMenu();
   void updateRecentlyOpenedFilesMenu(const std::list<std::string> &files);
   
+  // Drag and drop event handlers
+  virtual void dragEnterEvent(QDragEnterEvent *event);
+  virtual void dropEvent(QDropEvent *event);
+
 private:
 
   //variables
-- 
2.45.0