Adding the first draft at some ConsoleUI widgets

Signed-off-by: R. Tyler Ballance <tyler@monkeypox.org>

__init__.py

@@ -0,0 +1,59 @@
+import curses
+import weakref
+
+import consoleui.errors
+
+class Keys(object):
+	ESCAPE = 27 # curses doesn't define a KEY_ESCAPE for some reason
+
+class Widget(object):
+	'''
+		Abstract base class for all ConsoleUI classes
+	'''
+	def __init__(self, *args, **kwargs):
+		super(Widget, self).__init__(*args, **kwargs)
+		self.children = []
+		self.parent = kwargs.get('parent')
+
+	def render(self):
+		raise consoleui.errors.AbstractError('render() should be defined in the class subclassing Widget')
+
+class Menu(Widget):
+	''' 
+		Menu is the base class for rendering a horizontal menu
+	'''
+	separator = '  |  '
+	HOTKEY = curses.A_BOLD | curses.A_UNDERLINE 
+	NORMAL = curses.A_NORMAL
+	def __init__(self, *args, **kwargs):
+		super(Menu, self).__init__(*args, **kwargs)
+		self.elements = kwargs['elements']
+
+	def render(self):
+		assert self.parent, ('Parent cannot be None to render a Menu!')
+		x, y = 1, 3
+		for element in self.elements:
+			under = None
+			try:
+				under = element.index('_')
+			except ValueError:
+				pass
+
+			if not under == None:
+				self.parent.addstr(y, x, element[under+1:under+2], self.HOTKEY)
+				x = x + 1
+				self.parent.addstr(y, x, element[under+2:], self.NORMAL)
+				x = x + len(element[under+2:])
+			else:
+				self.parent.addstr(y, x, element)
+				x = x + len(element)
+
+			if element != self.elements[-1]:
+				self.parent.addstr(y, x, self.separator, self.NORMAL)
+				x = x + len(self.separator)
+
+class Window(Widget):
+	pass
+
+class Submenu(Widget):
+	pass

errors.py

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+
+class NotImplementedError(Exception):
+	pass
+
+class AbstractError(Exception):
+	pass