Patch #410231: Add the Python Tix library.
diff --git a/Demo/tix/samples/Control.py b/Demo/tix/samples/Control.py
new file mode 100755
index 0000000..b8e1156
--- /dev/null
+++ b/Demo/tix/samples/Control.py
@@ -0,0 +1,102 @@
+#!/usr/local/bin/python
+# 
+# $Id$
+#
+# Tix Demostration Program
+#
+# This sample program is structured in such a way so that it can be
+# executed from the Tix demo program "tixwidgets": it must have a
+# procedure called "RunSample". It should also have the "if" statment
+# at the end of this file so that it can be run as a standalone
+# program.
+
+# This file demonstrates the use of the tixControl widget -- it is an
+# entry widget with up/down arrow buttons. You can use the arrow buttons
+# to adjust the value inside the entry widget.
+#
+# This example program uses three Control widgets. One lets you select
+# integer values; one lets you select floating point values and the last
+# one lets you select a few names.
+#
+import Tix
+
+def RunSample(w):
+    global demo_maker, demo_thrust, demo_num_engines
+
+    demo_maker = Tix.StringVar()
+    demo_thrust = Tix.DoubleVar()
+    demo_num_engines = Tix.IntVar()
+    demo_maker.set('P&W')
+    demo_thrust.set(20000.0)
+    demo_num_engines.set(2)
+
+    top = Tix.Frame(w, bd=1, relief=Tix.RAISED)
+
+    # $w.top.a allows only integer values
+    #
+    # [Hint] The -options switch sets the options of the subwidgets.
+    # [Hint] We set the label.width subwidget option of the Controls to 
+    #        be 16 so that their labels appear to be aligned.
+    #
+    a = Tix.Control(top, label='Number of Engines: ', integer=1,
+		    variable=demo_num_engines, min=1, max=4,
+		    options='entry.width 10 label.width 20 label.anchor e')
+    
+    b = Tix.Control(top, label='Thrust: ', integer=0,
+		    min='10000.0', max='60000.0', step=500,
+		    variable=demo_thrust,
+		    options='entry.width 10 label.width 20 label.anchor e')
+
+    c = Tix.Control(top, label='Engine Maker: ', value='P&W',
+		    variable=demo_maker,
+		    options='entry.width 10 label.width 20 label.anchor e')
+
+    # We can't define these in the init because the widget 'c' doesn't
+    # exist yet and we need to reference it
+    c['incrcmd'] = lambda w=c: adjust_maker(w, 1)
+    c['decrcmd'] = lambda w=c: adjust_maker(w, -1)
+    c['validatecmd'] = lambda w=c: validate_maker(w)
+
+    a.pack(side=Tix.TOP, anchor=Tix.W)
+    b.pack(side=Tix.TOP, anchor=Tix.W)
+    c.pack(side=Tix.TOP, anchor=Tix.W)
+
+    box = Tix.ButtonBox(w, orientation=Tix.HORIZONTAL)
+    box.add('ok', text='Ok', underline=0, width=6,
+	    command=lambda w=w: ok_command(w))
+    box.add('cancel', text='Cancel', underline=0, width=6,
+	    command=lambda w=w: w.destroy())
+    box.pack(side=Tix.BOTTOM, fill=Tix.X)
+    top.pack(side=Tix.TOP, fill=Tix.BOTH, expand=1)
+
+maker_list = ['P&W', 'GE', 'Rolls Royce']
+
+def adjust_maker(w, inc):
+    i = maker_list.index(demo_maker.get())
+    i = i + inc
+    if i >= len(maker_list):
+	i = 0
+    elif i < 0:
+	i = len(maker_list) - 1
+
+    # In Tcl/Tix we should return the string maker_list[i]. We can't
+    # do that in Tkinter so we set the global variable. (This works).
+    demo_maker.set(maker_list[i])
+
+def validate_maker(w):
+    try:
+	i = maker_list.index(demo_maker.get())
+    except:
+	# Works here though. Why ? Beats me.
+	return maker_list[0]
+    # Works here though. Why ? Beats me.
+    return maker_list[i]
+
+def ok_command(w):
+    print "Selected", demo_num_engines.get(), "of", demo_maker.get(), " engines each of thrust", demo_thrust.get()
+    w.destroy()
+
+if __name__ == '__main__':
+    root = Tix.Tk()
+    RunSample(root)
+    root.mainloop()