drag+drop support

main.py

@@ -22,6 +22,10 @@ from datetime import datetime
 from functools import partial
 from multiprocessing import Process, current_process, freeze_support, Queue, set_start_method
 
+# Fix for plotting on linux
+if sys.platform.startswith("linux"):
+    os.environ["QT_QPA_PLATFORM"] = "xcb"
+
 # External library imports
 import psutil
 
@@ -535,6 +539,49 @@ class ThemeChangeWatcher(QObject):
         self.main_window.update_theme()
 
 
+class DropScrollArea(QScrollArea):
+    """QScrollArea that accepts .snirf file and folder drops."""
+    
+    def __init__(self, on_files_dropped_callback, parent=None):
+        super().__init__(parent)
+        self.on_files_dropped_callback = on_files_dropped_callback
+        self.setAcceptDrops(True)
+        # ScrollAreas require setting acceptDrops on their viewport as well
+        self.viewport().setAcceptDrops(True)
+
+    def dragEnterEvent(self, event) -> None:
+        if event.mimeData().hasUrls():
+            event.acceptProposedAction()
+        else:
+            event.ignore()
+
+    def dropEvent(self, event) -> None:
+        if not event.mimeData().hasUrls():
+            return
+
+        dropped_paths = [
+            url.toLocalFile() for url in event.mimeData().urls() if url.isLocalFile()
+        ]
+
+        files_to_load = []
+        for path_str in dropped_paths:
+            p = Path(path_str)
+            if p.is_file() and p.suffix.lower() == ".snirf":
+                files_to_load.append(os.path.normpath(str(p)))
+            elif p.is_dir():
+                files_to_load.extend(
+                    os.path.normpath(str(f)) for f in p.rglob("*.snirf")
+                )
+
+        if files_to_load:
+            self.on_files_dropped_callback(files_to_load)
+        else:
+            QMessageBox.information(
+                self,
+                "No Valid Files",
+                "None of the dropped items were .snirf files or directories containing .snirf files.",
+            )
+
 class MainApplication(QMainWindow):
     """
     Main application window that creates and sets up the UI.
@@ -715,7 +762,9 @@ class MainApplication(QMainWindow):
         self.bubble_layout = QGridLayout(self.bubble_container)
         self.bubble_layout.setAlignment(Qt.AlignmentFlag.AlignTop)
 
-        self.scroll_area = QScrollArea()
+        self.scroll_area = DropScrollArea(
+            on_files_dropped_callback=self.project_manager.load_dropped_files
+        )
         self.scroll_area.setWidgetResizable(True)
         self.scroll_area.setWidget(self.bubble_container)
         self.scroll_area.setMinimumHeight(200)