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#! /usr/local/bin/python
# www11.py -- display the contents of a URL in a Text widget
# - set window title
# - make window resizable
# - update display while reading
# - vertical scroll bar
# - rewritten as class
# - editable url entry and reload button
# - error dialog
import sys
import urllib
from Tkinter import *
import Dialog
def main():
if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
print "Usage:", sys.argv[0], "url"
sys.exit(2)
url = sys.argv[1]
viewer = Viewer()
viewer.load(url)
viewer.go()
class Viewer:
def __init__(self):
# Create root window
self.root = Tk()
self.root.minsize(1, 1)
# Create topframe for the entry and button
self.topframe = Frame(self.root)
self.topframe.pack({'fill': 'x'})
# Create a label in front of the entry
self.urllabel = Label(self.topframe, {'text': 'URL:'})
self.urllabel.pack({'side': 'left'})
# Create the entry containing the URL
self.entry = Entry(self.topframe,
{'relief': 'sunken', 'border': 2})
self.entry.pack({'side': 'left', 'fill': 'x', 'expand': 1})
self.entry.bind('<Return>', self.loadit)
# Create the button
self.reload = Button(self.topframe,
{'text': 'Reload',
'command': self.reload})
self.reload.pack({'side': 'right'})
# Create botframe for the text and scrollbar
self.botframe = Frame(self.root)
self.botframe.pack({'fill': 'both', 'expand': 1})
# The Scrollbar *must* be created first
self.vbar = Scrollbar(self.botframe)
self.vbar.pack({'fill': 'y', 'side': 'right'})
self.text = Text(self.botframe)
self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
# Link Text widget and Scrollbar
self.text['yscrollcommand'] = (self.vbar, 'set')
self.vbar['command'] = (self.text, 'yview')
self.url = None
def load(self, url):
# Load a new URL into the window
fp, url = self.urlopen(url)
if not fp:
return
self.url = url
self.root.title(url)
self.entry.delete('0', 'end')
self.entry.insert('end', url)
self.text.delete('0.0', 'end')
while 1:
line = fp.readline()
if not line: break
if line[-2:] == '\r\n': line = line[:-2] + '\n'
self.text.insert('end', line)
self.root.update_idletasks()
fp.close()
def urlopen(self, url):
# Open a URL --
# return (fp, url) if successful
# display dialog and return (None, url) for errors
try:
fp = urllib.urlopen(url)
except IOError, msg:
import types
if type(msg) == types.TupleType and len(msg) == 4:
if msg[1] == 302:
m = msg[3]
if m.has_key('location'):
url = m['location']
return self.urlopen(url)
elif m.has_key('uri'):
url = m['uri']
return self.urlopen(url)
self.errordialog(IOError, msg)
fp = None
return fp, url
def errordialog(self, exc, msg):
# Display an error dialog -- return when the user clicks OK
Dialog.Dialog(self.root, {
'text': str(msg),
'title': exc,
'bitmap': 'error',
'default': 0,
'strings': ('OK',),
})
def go(self):
# Start Tk main loop
self.root.mainloop()
def reload(self, *args):
# Callback for Reload button
if self.url:
self.load(self.url)
def loadit(self, *args):
# Callback for <Return> event in entry
self.load(self.entry.get())
main()
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