Re: [Webware-discuss] Components

[Aaron Held]

I agree and think that this is what we are talking about. 
I like the _spirit_ of  interfaces, not necessarily the zope 
implementation code.  I would rather see a default or 'gold' component 
that is downloadable and usable, and other alternate implementations.

So if a developer downloaded and is usuing your menu code below I could 
write a better one that uses <UL>and <LI> rather then divs and people 
could drop in my class as a replacement for yours.

Someone else could then provide another class that uses a menu class and 
prints out breadcrumbs...

and so on...

-Aaron

Jim Bucher wrote:

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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This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger 
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disoriented. TotalView can help you find your way. Available on major UNIX 
and Linux platforms. Try it free. www.etnus.com
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