initial checkin of www Tk examples

Demo/tkinter/www/www11.py

@@ -0,0 +1,137 @@
+#! /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()