Update grid constructor to get reference to parent. Add dropdown exam…

…ple. Update tests

examples/controls/dropdown.py

@@ -0,0 +1,21 @@
+"""The most basic possible use case for py_cui
+
+@author:    Jakub Wlodek
+@created:   12-Aug-2019
+"""
+
+# Import the lib
+import py_cui
+
+# create the CUI object. Will have a 3 by 3 grid with indexes from 0,0 to 2,2
+root = py_cui.PyCUI(3, 3)
+
+# Add a label to the center of the CUI in the 1,1 grid position
+dropdown = root.add_custom_widget(py_cui.widgets.DropdownMenu, 'Example Dropdown', 1, 1, 1, 1, 1, 0, 10)
+textbox = root.add_text_box('Test Text Box', 0, 1, 1, 1, 1, 0, "Hi") 
+
+for i in range(15):
+    dropdown.add_item(f'Test{i}')
+
+# Start/Render the CUI
+root.start()

py_cui/__init__.py

@@ -179,7 +179,7 @@ def __init__(
 
         # Initialize grid, renderer, and widget dict
         self._grid = py_cui.grid.Grid(
-            num_rows, num_cols, self._height, self._width, self._logger
+            self, num_rows, num_cols, self._height, self._width, self._logger
         )
         self._stdscr: Any = None
         self._refresh_timeout = -1

py_cui/grid.py

@@ -31,7 +31,7 @@ class Grid:
     """
 
 
-    def __init__(self, num_rows: int, num_columns: int, height: int, width: int, logger: 'py_cui.debug.PyCUILogger'):
+    def __init__(self, parent, num_rows: int, num_columns: int, height: int, width: int, logger: 'py_cui.debug.PyCUILogger'):
         """Constructor for the Grid class
 
         Parameters
@@ -46,6 +46,7 @@ def __init__(self, num_rows: int, num_columns: int, height: int, width: int, log
             The width in characters of the terminal window
         """
 
+        self._parent = parent
         self._num_rows      = num_rows
         self._num_columns   = num_columns
         self._height        = height

py_cui/widget_set.py

@@ -60,7 +60,7 @@ def __init__(self, num_rows: int, num_cols: int, logger: 'py_cui.debug.PyCUILogg
         status_bars_height = self._root.title_bar.get_height() + self._root.status_bar.get_height()
         self._height = self._height - status_bars_height - 2
 
-        self._grid = py_cui.grid.Grid(num_rows, num_cols, self._height, self._width, logger)
+        self._grid = py_cui.grid.Grid(root, num_rows, num_cols, self._height, self._width, logger)
 
         self._selected_widget: Optional[int] = None
         self._logger = logger

py_cui/widgets.py

@@ -91,6 +91,13 @@ def __init__(self, id, title: str, grid: 'py_cui.grid.Grid', row: int, column: i
         self._context_menu = None
 
 
+    def _get_parent_ui(self):
+        """Function used to get reference to parent UI instance for interfacing with popups and context menus
+        """
+
+        return self._grid._parent
+
+
     def add_key_command(self, key: Union[int, List[int]], command: Callable[[],Any]) -> None:
         """Maps a keycode to a function that will be executed when in focus mode
 

tests/conftest.py

@@ -10,18 +10,26 @@
 def LOGGER():
     return dbg.PyCUILogger('PYCUI TEST')
 
+@pytest.fixture
+def PYCUI():
+
+    def _PYCUI(rows, cols, height, width):
+        return py_cui.PyCUI(rows, cols, simulated_terminal=[height, width])
+
+    return _PYCUI
+
 
 @pytest.fixture
 def RENDERER(request, LOGGER):
     return py_cui.renderer.Renderer(None, None, LOGGER)
 
 
 @pytest.fixture
-def GRID(request, LOGGER):
+def GRID(request, PYCUI, LOGGER):
 
     def _GRID(rows, cols, height, width):
 
-        return py_cui.grid.Grid(rows, cols, height, width, LOGGER)
+        return py_cui.grid.Grid(PYCUI, rows, cols, height, width, LOGGER)
 
     return _GRID
 
@@ -43,15 +51,6 @@ def _CUSTOMWIDGET(id, name, row, col, rowspan, colspan):
     return _CUSTOMWIDGET
 
 
-@pytest.fixture
-def PYCUI():
-
-    def _PYCUI(rows, cols, height, width):
-        return py_cui.PyCUI(rows, cols, simulated_terminal=[height, width])
-
-    return _PYCUI
-
-
 @pytest.fixture
 def WIDGETSET(request, LOGGER):