Initial mytui with widget MultiSelect created

__init__.py

@@ -0,0 +1,75 @@
+import re
+
+import textual.widgets
+
+
+class MultiSelect(textual.widgets.Select):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.__new_options__ = []
+        self.__seltion_states__ = {}
+        self.__default_value__ = True
+        self.__selection_regex__ = ""
+
+    def __sorted_selection_keys__(self):
+        rv = list(self.__seltion_states__.keys())
+        rv.sort()
+        return rv
+
+    def SetSelectionRegEx(self, regex: str) -> None:
+        self.__selection_regex__ = regex
+        self.set_options(self.__get_select_list__())
+
+    def AddEntry(self, entry) -> None:
+        if entry not in self.__new_options__ and entry not in self.__seltion_states__:
+            self.__seltion_states__[entry] = self.__default_value__
+            self.__new_options__.append(entry)
+
+    def __toggle__(self, entry_num):
+        if entry_num < 0:
+            if not self.__selection_regex__:
+                self.__default_value__ = entry_num == -1
+            for key in self.__seltion_states__:
+                if self.__match__(key):
+                    self.__seltion_states__[key] = entry_num == -1
+        elif entry_num > len(self.__seltion_states__):
+            raise ValueError(f"The Entry '{entry} is not in the list")
+        else:
+            entry = self.__sorted_selection_keys__()[entry_num]
+            self.__seltion_states__[entry] = not self.__seltion_states__[entry]
+
+    def __match__(self, key):
+        try:
+            match = len(re.findall(self.__selection_regex__, key)) > 0
+        except re.error:
+            match = True    # No valid regular expression
+        return match
+
+    def __get_select_list__(self):
+        rv = []
+        if len(self.__seltion_states__) > 2:
+            rv.append(('All', -1))
+            rv.append(('None', -2))
+        for index, key in enumerate(self.__sorted_selection_keys__()):
+            if self.__match__(key):
+                prefix = "\\[X] " if self.__seltion_states__[key] else "\\[-] "
+                rv.append((prefix + key, index))
+        return rv
+
+    def IsSelected(self, entry):
+        return self.__seltion_states__.get(entry, self.__default_value__)
+
+    def _on_blur(self, event):
+        for entry in self.__new_options__:
+            self.__seltion_states__[entry] = self.__default_value__
+        self.__new_options__ = []
+        self.set_options(self.__get_select_list__())
+        return super()._on_blur(event)
+
+    def _on_message(self, message):
+        if type(message) == self.Changed:
+            if type(message.value) is int:
+                self.__toggle__(message.value)
+                self.clear()
+                self.set_options(self.__get_select_list__())
+        return super()._on_message(message)