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# Erector Page base class.
#
# Allows for accumulation of script and style tags (see example below) with either
# external or inline content. External references are 'uniq'd, so it's a good idea to declare
# a js script in all widgets that use it, so you don't accidentally lose the script if you remove
# the one widget that happened to declare it.
#
# At minimum, child classes must override #body_content. You can also get a "quick and dirty"
# page by passing a block to Page.new but that doesn't really buy you much.
#
# The script and style declarations are accumulated at class load time,
# This technique allows all widgets to add their own requirements to the page header
# without extra logic for declaring which pages include which nested widgets.
# Unfortunately, this means that every page in the application will share the same headers,
# which may lead to conflicts. If you want something to show up in the headers
# for just one page, override #head_content, call super, and emit it yourself.
#
# Author:: Alex Chaffee, alex@stinky.com
#
# = Example Usage:
#
# class MyPage < Page
# js "lib/jquery.js"
# script "$(document).ready(function(){...});"
# css "stuff.css"
# style "li.foo { color: red; }"
#
# def page_title
# "my app"
# end
#
# def body_content
# h1 "My App"
# p "welcome to my app"
# end
# end
#
# class WidgetWithCss < Erector::Widget
# Page.style "div.custom { border: 2px solid green; }"
#
# def content
# div :class => "custom" do
# text "green is good"
# end
# end
# end
#
# = Thoughts:
# * It may be desirable to unify #js and #script, and #css and #style, and have the routine be
# smart enough to analyze its parameter to decide whether to add it to the list of external
# or inline references.
#
class Page < Erector::Widget
@@js = []
def self.js(*files)
files.each {|f| @@js << f unless @@js.include?(f) }
end
@@css = []
def self.css(*files)
files.each {|f| @@css << f unless @@css.include?(f) }
end
@@styles = []
def self.style(txt)
@@styles << txt
end
@@scripts = []
def self.script(txt)
@@scripts << txt
end
def doctype
'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">'
end
# override me
def page_title
"page"
end
def content
rawtext doctype
html :xmlns => 'http://www.w3.org/1999/xhtml', 'xml:lang' => 'en', :lang => 'en' do
head do
head_content
end
body do
body_content
end
end
end
# override me (or instantiate Page with a block)
def body_content
instance_eval(&@block) if @block
end
def head_content
meta 'http-equiv' => 'content-type', :content => 'text/html;charset=UTF-8'
title page_title
@@js.each do |file|
script :type=>"text/javascript", :src => file
end
@@css.each do |file|
link :rel=>"stylesheet", :href => file, :type => "text/css", :media => "all"
end
inline_styles
inline_scripts
end
def inline_styles
style :type=>"text/css", 'xml:space' => 'preserve' do
rawtext "\n"
@@styles.each do |txt|
rawtext "\n"
rawtext txt
end
end
end
def inline_scripts
javascript do
@@scripts.each do |txt|
rawtext "\n"
rawtext txt
end
end
end
style <<-STYLE
img {border: none}
.right {float: right;}
.clear {clear: both;}
STYLE
end
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