added some drag and drop functionality

dropship.glade

@@ -16,13 +16,13 @@
           <object class="GtkStackSwitcher">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
-            <property name="stack">mainStack</property>
+            <property name="stack">sendReceiveStack</property>
           </object>
         </child>
       </object>
     </child>
     <child>
-      <object class="GtkStack" id="mainStack">
+      <object class="GtkStack" id="sendReceiveStack">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <child>
@@ -40,7 +40,7 @@
                 <property name="orientation">vertical</property>
                 <property name="homogeneous">True</property>
                 <child>
-                  <object class="GtkLabel">
+                  <object class="GtkLabel" id="dropLabel">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
                     <property name="label" translatable="yes">Drag a file to send</property>

dropship.py

@@ -6,9 +6,6 @@ from gi.repository import Gtk, GLib, Gdk
 
 class Main:
     def __init__(self):
-        self.timer = None
-        self.event = None
-        self.timer_running = False
 
         # Connect to the Glade file
         self.builder = Gtk.Builder()
@@ -25,7 +22,36 @@ class Main:
         window.connect('delete-event', Gtk.main_quit)
         window.show()
 
-        #self.stack = self.builder.get_object("mainStack")
+        #self.stack = self.builder.get_object("sendReceiveStack")
+
+        # Initiate the drag and drop area
+        # https://python-gtk-3-tutorial.readthedocs.io/en/latest/drag_and_drop.html
+        self.files_to_send = ''
+        
+        # todo check the target flags, https://lazka.github.io/pgi-docs/Gtk-3.0/flags.html#Gtk.TargetFlags
+        enforce_target = Gtk.TargetEntry.new('text/plain', Gtk.TargetFlags(4), 129)
+
+        self.dropBox = self.builder.get_object('dropBox')
+        self.dropBox.drag_dest_set(Gtk.DestDefaults.ALL, [enforce_target], Gdk.DragAction.COPY)
+        self.dropBox.connect('drag-data-received', self.onDrop)
+        self.dropLabel = self.builder.get_object('dropLabel')
+
+    def onDrop(self,widget, drag_context, x, y, data, info, time):
+        print(drag_context, x,y,data,info,time)
+        files = data.get_text().split()
+
+        if len(files) == 1:
+            print(files)
+            self.dropLabel.set_text('Sending..')
+        elif len(files) > 1:
+            print('multiple files!')
+            print(files)
+            self.dropLabel.set_text('\n'.join(files))
+            
+        self.files_to_send = files
+
+
+
 
 if __name__ == '__main__':
     main = Main()