Add drag and drop feature for media file and project

src/gui/MainWindow.cpp

@@ -89,6 +89,9 @@ MainWindow::MainWindow()
   setWindowIcon(QIcon(":/mapmap-logo"));
   setCurrentFile("");
 
+  // Allow drag n drop
+  setAcceptDrops(true);
+
   // Create and start timer.
   videoTimer = new QTimer(this);
   connect(videoTimer, SIGNAL(timeout()), this, SLOT(processFrame()));
@@ -396,6 +399,70 @@ bool MainWindow::eventFilter(QObject *object, QEvent *event)
   return QMainWindow::eventFilter(object, event);
 }
 
+void MainWindow::dragEnterEvent(QDragEnterEvent *event)
+{
+  const QMimeData *mimeData = event->mimeData();
+  bool allowDrag = true;
+
+  if (mimeData->hasUrls()) {
+    foreach (QUrl url, mimeData->urls()) {
+      QString fileName = url.toLocalFile();
+      // Don't allow drag if file is not supported
+      if (!fileSupported(fileName, MM::FILE_EXTENSION) &&
+          !fileSupported(fileName, MM::IMAGE_FILES_FILTER) &&
+          !fileSupported(fileName, MM::VIDEO_FILES_FILTER)) {
+        allowDrag = false;
+      }
+    }
+  }
+
+  if (allowDrag)
+    event->acceptProposedAction();
+}
+
+void MainWindow::dragMoveEvent(QDragMoveEvent *event)
+{
+  event->acceptProposedAction();
+}
+
+void MainWindow::dragLeaveEvent(QDragLeaveEvent *event)
+{
+  event->accept();
+}
+
+void MainWindow::dropEvent(QDropEvent *event)
+{
+  const QMimeData *mimeData = event->mimeData();
+
+  if (mimeData->hasUrls()) {
+    // In case that dragged many files
+    foreach (QUrl url, mimeData->urls()) {
+      QString fileName = url.toLocalFile();
+
+      if (!fileName.isEmpty()) {
+        // Test if is mmp file and exit loop
+        if (fileSupported(fileName, MM::FILE_EXTENSION)) {
+          if (okToContinue()) {
+            loadFile(fileName);
+          }
+          // Exit for prevent drag to many project files
+          break;
+        }
+        // Allow to drag too many videos or images
+        else {
+          // Check if file is image or not
+          // according to file extension
+          if (fileSupported(fileName, MM::IMAGE_FILES_FILTER))
+            importMediaFile(fileName, true);
+          else
+            importMediaFile(fileName, false);
+        }
+      }
+    }
+  }
+  event->acceptProposedAction();
+}
+
 void MainWindow::setOutputWindowFullScreen(bool enable)
 {
   outputWindow->setFullScreen(enable);
@@ -2812,6 +2879,16 @@ bool MainWindow::fileSupported(const QString &file, bool isImage)
   return false;
 }
 
+bool MainWindow::fileSupported(const QString &file, const QString &extension)
+{
+  if (!QFileInfo(file).suffix().isEmpty() &&
+      extension.contains(QFileInfo(file).suffix(), Qt::CaseInsensitive)) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
 QString MainWindow::locateMediaFile(const QString &uri, bool isImage)
 {
   // Get more info about url

src/gui/MainWindow.h

@@ -83,6 +83,11 @@ protected:
   void keyPressEvent(QKeyEvent *event);
   bool eventFilter(QObject *object, QEvent *event);
 
+  void dragEnterEvent(QDragEnterEvent *event);
+  void dragMoveEvent(QDragMoveEvent *event);
+  void dragLeaveEvent(QDragLeaveEvent *event);
+  void dropEvent(QDropEvent *event);
+
   // Slots ////////////////////////////////////////////////////////////////////////////////////////////////////
 private slots:
 
@@ -301,6 +306,7 @@ public:
   bool fileExists(const QString& file);
   // Check if the file is supported
   bool fileSupported(const QString& file, bool isImage);
+  bool fileSupported(const QString &file, const QString &extension);
   // Locate the file not found
   QString locateMediaFile(const QString& uri, bool isImage);
 

src/gui/MapperGLCanvas.cpp

@@ -73,6 +73,9 @@ MapperGLCanvas::MapperGLCanvas(MainWindow* mainWindow,
 
   // Black background.
   this->scene()->setBackgroundBrush(Qt::black);
+
+  // Enable dragndrop
+  setAcceptDrops(true);
 }
 
 MShape::ptr MapperGLCanvas::getShapeFromMapping(Mapping::ptr mapping)
@@ -173,6 +176,68 @@ void MapperGLCanvas::applyZoomToView()
   emit zoomFactorChanged(zoomFactor);
 }
 
+void MapperGLCanvas::dragEnterEvent(QDragEnterEvent *event)
+{
+  const QMimeData *mimeData = event->mimeData();
+  bool allowDrag = true;
+
+  if (mimeData->hasUrls()) {
+    foreach (QUrl url, mimeData->urls()) {
+      QString fileName = url.toLocalFile();
+      // Don't allow drag if file is not supported
+      if (!MainWindow::window()->fileSupported(fileName, MM::FILE_EXTENSION) &&
+          !MainWindow::window()->fileSupported(fileName, MM::IMAGE_FILES_FILTER) &&
+          !MainWindow::window()->fileSupported(fileName, MM::VIDEO_FILES_FILTER)) {
+        allowDrag = false;
+      }
+    }
+  }
+
+  if (allowDrag)
+    event->acceptProposedAction();
+}
+
+void MapperGLCanvas::dragMoveEvent(QDragMoveEvent *event)
+{
+  event->acceptProposedAction();
+}
+
+void MapperGLCanvas::dragLeaveEvent(QDragLeaveEvent *event)
+{
+  event->accept();
+}
+
+void MapperGLCanvas::dropEvent(QDropEvent *event)
+{
+  const QMimeData *mimeData = event->mimeData();
+
+  if (mimeData->hasUrls()) {
+    // In case that dragged many files
+    foreach (QUrl url, mimeData->urls()) {
+      QString fileName = url.toLocalFile();
+
+      if (!fileName.isEmpty()) {
+        // Test if is mmp file and exit loop
+        if (MainWindow::window()->fileSupported(fileName, MM::FILE_EXTENSION)) {
+            MainWindow::window()->loadFile(fileName);
+          // Exit for prevent drag to many project files
+          break;
+        }
+        // Allow to drag too many videos or images
+        else {
+          // Check if file is image or not
+          // according to file extension
+          if (MainWindow::window()->fileSupported(fileName, MM::IMAGE_FILES_FILTER))
+            MainWindow::window()->importMediaFile(fileName, true);
+          else
+            MainWindow::window()->importMediaFile(fileName, false);
+        }
+      }
+    }
+  }
+  event->acceptProposedAction();
+}
+
 
 //
 void MapperGLCanvas::mousePressEvent(QMouseEvent* event)

src/gui/MapperGLCanvas.h

@@ -110,6 +110,10 @@ protected:
 //  void mouseMoveEvent(QMouseEvent* event);
 //  void mouseReleaseEvent(QMouseEvent* event);
 //  void paintEvent(QPaintEvent* event);
+  void dragEnterEvent(QDragEnterEvent *event);
+  void dragMoveEvent(QDragMoveEvent *event);
+  void dragLeaveEvent(QDragLeaveEvent *event);
+  void dropEvent(QDropEvent *event);
 
 protected:
 //  /**