Demo/tkinter/www/www10.py

   1 #! /usr/bin/env python
   2
   3 # www10.py -- display the contents of a URL in a Text widget
   4 # - set window title
   5 # - make window resizable
   6 # - update display while reading
   7 # - vertical scroll bar
   8 # - rewritten as class
   9 # - editable url entry and reload button
  10
  11 import sys
  12 import urllib
  13 from Tkinter import *
  14
  15 def main():
  16         if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
  17                 print "Usage:", sys.argv[0], "url"
  18                 sys.exit(2)
  19         url = sys.argv[1]
  20         viewer = Viewer()
  21         viewer.load(url)
  22         viewer.go()
  23
  24 class Viewer:
  25
  26         def __init__(self):
  27                 # Create root window
  28                 self.root = Tk()
  29                 self.root.minsize(1, 1)
  30
  31                 # Create topframe for the entry and button
  32                 self.topframe = Frame(self.root)
  33                 self.topframe.pack({'fill': 'x', 'side': 'top'})
  34
  35                 # Create a label in front of the entry
  36                 self.urllabel = Label(self.topframe, {'text': 'URL:'})
  37                 self.urllabel.pack({'side': 'left'})
  38
  39                 # Create the entry containing the URL
  40                 self.entry = Entry(self.topframe, {'relief': 'sunken'})
  41                 self.entry.pack({'side': 'left', 'fill': 'x', 'expand': 1})
  42                 self.entry.bind('<Return>', self.loadit)
  43
  44                 # Create the button
  45                 self.reload = Button(self.topframe,
  46                                      {'text': 'Reload',
  47                                       'command': self.reload})
  48                 self.reload.pack({'side': 'right'})
  49
  50                 # Create botframe for the text and scrollbar
  51                 self.botframe = Frame(self.root)
  52                 self.botframe.pack({'fill': 'both', 'expand': 1})
  53
  54                 # The Scrollbar *must* be created first
  55                 self.vbar = Scrollbar(self.botframe)
  56                 self.vbar.pack({'fill': 'y', 'side': 'right'})
  57                 self.text = Text(self.botframe)
  58                 self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
  59
  60                 # Link Text widget and Scrollbar
  61                 self.text['yscrollcommand'] = (self.vbar, 'set')
  62                 self.vbar['command'] = (self.text, 'yview')
  63
  64                 self.url = None
  65
  66         def load(self, url):
  67                 # Load a new URL into the window
  68                 fp = urllib.urlopen(url)
  69
  70                 self.url = url
  71
  72                 self.root.title(url)
  73
  74                 self.entry.delete('0', 'end')
  75                 self.entry.insert('end', url)
  76
  77                 self.text.delete('1.0', 'end')
  78
  79                 while 1:
  80                         line = fp.readline()
  81                         if not line: break
  82                         if line[-2:] == '\r\n': line = line[:-2] + '\n'
  83                         self.text.insert('end', line)
  84                         self.root.update_idletasks()
  85
  86                 fp.close()
  87
  88         def go(self):
  89                 # Start Tk main loop
  90                 self.root.mainloop()
  91
  92         def reload(self, *args):
  93                 # Callback for Reload button
  94                 if self.url:
  95                         self.load(self.url)
  96
  97         def loadit(self, *args):
  98                 # Callback for <Return> event in entry
  99                 self.load(self.entry.get())
 100
 101 main()