Added data_file example.

wobbl_tools/examples/data_file.py

@@ -0,0 +1,64 @@
+#!/usr/bin/python3
+
+"""
+Example on how to use the data_file module.
+"""
+
+from dataclasses import dataclass
+from wobbl_tools.data_file import load_dataclass_json
+
+
+@dataclass
+class ExampleData:
+    example_int: int=256
+    example_str: str="Hello, World!"
+
+
+class Main:
+    def __init__(self):
+        self.data = load_dataclass_json(
+            dataclass=ExampleData,
+            file_path="example_data.json",
+            app=self,
+            builtin_save=True,
+            builtin_change_event=True
+        )
+
+        self.data.set_attribute_change_event(self.on_data_change)
+
+        print(self.data)
+        """
+        Output on first run:
+        ExampleData(example_int=256, example_str='Hello, World!')
+        
+        Output on second run:
+        ExampleData(example_int=512, example_str='Bye, World!')
+        """
+
+        self.data.example_int = 512
+        self.data.example_str = "Bye, World!"
+        """
+        Output on first run:
+        Data changed: example_int 512
+        Data changed: example_str Bye, World!
+        
+        Output on second run:
+        Data changed: example_int 512
+        Data changed: example_str Bye, World!
+        """
+
+        self.data.save("example_data.json")
+
+    def on_data_change(self, key, value):
+        print("Data changed:", key, value)
+
+        """
+        If this function doesn't return True, the event would be "canceled".
+        """
+
+        return True
+
+
+if __name__ == "__main__":
+    app = Main()
+