[Webware-discuss] Components

[Jim Bucher]

I like the idea of using components for reusability. But interfaces, 
inheritance and mixins seem to be a complex solution. How about doing it 
this way. Make the component a class that stands on its own. When the 
component needs to interact with a page, session, etc then give it 
access to those objects. It seems to be simple. What do you think? Here 
is a quick example.

##### Menu.py

class Menu:

  items = []  # a list of ('URL name', 'menu name') tuples

  def write(self, page):
    page.writeln("<div class='menu'>")
    for item in self.items:
      page.writeln("<a href='%s'> %s </a> &nbsp" % item)
    page.writeln("</div>")
  def add(self, item):
    self.items.append(item)
  def remove(self, index):
    self.items.pop(index)
##### SitePage.py

from WebKit.Page import Page
from Menu import Menu
class SitePage(Page):

  def __init__(self):
    Page.__init__(self)
    self.createMenu()
  def createMenu(self):
    self.menu = Menu()
    menu = self.menu
    menu.add('Login','Login')
    menu.add('Project','Select Project')
    menu.add('Soil', 'Soils')
    menu.add('Plant', 'Plants')
    menu.add('PlantCommunity', 'Plant Communities')
    menu.add('Grazer', 'Grazers / Preferences')
    menu.add('GrazerPlan', 'Grazing Profiles')
    menu.add('Run', 'Model Runs')
  def writeBodyParts(self):
    self.menu.write(self)


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