[tree] emit signal upon data tree selection

central_widget.py

@@ -87,14 +87,24 @@ class FileView(QWidget):
     
     def dataTreeResize(self, index):
         self._data_tree.resizeColumnToContents(index.column())
-        
+    
+    def dataTreeSelection(self, current_index, last_index):
+        if not current_index.isValid():
+            return
+        item = current_index.internalPointer()
+        comm.communicator.item_selected.emit(item)
+
     def update(self):
         data_model = TreeModel(self._file_handler, TreeType.Data)
         metadata_model = TreeModel(self._file_handler, TreeType.Metadata)
         self._data_tree.setModel(data_model)
+        selection_model = QItemSelectionModel(data_model)
+        self._data_tree.setSelectionModel(selection_model)
+        selection_model.currentChanged.connect(self.dataTreeSelection)
         self._mdata_tree.setModel(metadata_model)
-        self._data_tree.resizeColumnToContents(0)
-        self._mdata_tree.resizeColumnToContents(0)
+        for i in range(data_model.columnCount(None)):
+            self._data_tree.resizeColumnToContents(i)
+            self._mdata_tree.resizeColumnToContents(i)
         
     def reset(self):
         print("FileView ", self._file_handler.is_valid)

communicator.py

@@ -1,3 +1,4 @@
+from tree_model import NixTreeItem
 from PyQt5.QtCore import QObject, pyqtSignal
 
 class Communicate(QObject):
@@ -5,5 +6,7 @@ class Communicate(QObject):
       Small class for across app communication. Defines signals, to which other classes can connect.
     """
     open_recent = pyqtSignal(str)
+    
+    item_selected = pyqtSignal(NixTreeItem)
      
 communicator = Communicate()