tutorial example: nested menus as widgets

--HG--
branch : feature-sphinx

1 files changed, 59 insertions, 0 deletions

diff --git a/docs/tutorial/menu3.py b/docs/tutorial/menu3.py
new file mode 100644
index 0000000..2d257a6
--- /dev/null
+++ b/docs/tutorial/menu3.py
@@ -0,0 +1,59 @@
+import urwid
+
+class MenuButton(urwid.Button):
+    def __init__(self, caption, callback):
+        super(MenuButton, self).__init__("")
+        urwid.connect_signal(self, 'click', callback)
+        self._w = urwid.AttrMap(urwid.SelectableIcon(caption, 1),
+            None, focus_map='reversed')
+
+class SubMenu(urwid.WidgetWrap):
+    def __init__(self, caption, choices):
+        super(SubMenu, self).__init__(
+            MenuButton(u"MENU: %s" % caption, self.open_menu))
+        self.menu = Menu(caption, choices)
+
+    def open_menu(self, button):
+        loop.widget = self.menu
+
+class Menu(urwid.ListBox):
+    def __init__(self, title, choices):
+        super(Menu, self).__init__(urwid.SimpleListWalker([
+            urwid.Text(title),
+            urwid.Divider()]))
+        self.body.extend(choices)
+        self.title = title
+
+class Choice(urwid.WidgetWrap):
+    def __init__(self, caption):
+        super(Choice, self).__init__(
+            MenuButton(caption, self.item_chosen))
+        self.caption = caption
+
+    def item_chosen(self, button):
+        response = urwid.Text(u'You chose %s' % self.caption)
+        loop.widget = urwid.Filler(response)
+        # exit on the next input from user
+        loop.unhandled_input = exit_program
+
+def exit_program(key):
+    raise urwid.ExitMainLoop()
+
+menu_top = Menu(u'Main Menu', [
+    SubMenu(u'Applications', [
+        SubMenu(u'Accessories', [
+            Choice(u'Text Editor'),
+            Choice(u'Terminal'),
+        ]),
+    ]),
+    SubMenu(u'System', [
+        SubMenu(u'Preferences', [
+            Choice(u'Appearance'),
+        ]),
+        Choice(u'Lock Screen'),
+    ]),
+])
+
+loop = urwid.MainLoop(menu_top,
+    palette=[('reversed', 'standout', '')])
+loop.run()