import Tkinter
import Pmw
class ThresholdScale(Pmw.MegaWidget):
""" Megawidget containing a scale and an indicator.
"""
def __init__(self, parent = None, **kw):
# Define the megawidget options.
optiondefs = (
('colors', ('green', 'red'), None),
('orient', 'vertical', Pmw.INITOPT),
('labelmargin', 0, Pmw.INITOPT),
('labelpos', None, Pmw.INITOPT),
('threshold', (50,), None),
('value', None, Pmw.INITOPT),
)
self.defineoptions(kw, optiondefs)
# Initialise base class (after defining options).
Pmw.MegaWidget.__init__(self, parent)
# Create the components.
interior = self.interior()
# Create the indicator component.
self.indicator = self.createcomponent('indicator',
(), None,
Tkinter.Frame, interior,
width = 16,
height = 16,
borderwidth = 2,
relief = 'raised')
# Create the value component.
self.value = self.createcomponent('value',
(), None,
Tkinter.Label, interior,
width = 3)
# Create the scale component.
if self['orient'] == 'vertical':
# The default scale range seems to be
# the wrong way around - reverse it.
from_ = 100
to = 0
else:
from_ = 0
to = 100
self.scale = self.createcomponent('scale',
(), None,
Tkinter.Scale, interior,
orient = self['orient'],
command = self._doCommand,
tickinterval = 20,
length = 200,
from_ = from_,
to = to,
showvalue = 0)
value = self['value']
if value is not None:
self.scale.set(value)
# Use grid to position all components
if self['orient'] == 'vertical':
self.indicator.grid(row = 1, column = 1)
self.value.grid(row = 2, column = 1)
self.scale.grid(row = 3, column = 1)
# Create the label.
self.createlabel(interior, childRows=3)
else:
self.indicator.grid(row = 1, column = 1)
self.value.grid(row = 1, column = 2)
self.scale.grid(row = 1, column = 3)
# Create the label.
self.createlabel(interior, childCols=3)
# Check keywords and initialise options.
self.initialiseoptions()
def _doCommand(self, valueStr):
valueInt = self.scale.get()
colors = self['colors']
thresholds = self['threshold']
color = colors[-1]
for index in range(len(colors) - 1):
if valueInt <= thresholds[index]:
color = colors[index]
break
self.indicator.configure(background = color)
self.value.configure(text = valueStr)
Pmw.forwardmethods(ThresholdScale, Tkinter.Scale, 'scale')
# Initialise Tkinter and Pmw.
root = Pmw.initialise()
root.title('Pmw ThresholdScale demonstration')
# Create and pack two ThresholdScale megawidgets.
mega1 = ThresholdScale(scale_showvalue = 1)
mega1.pack(side = 'left', padx = 10, pady = 10)
mega2 = ThresholdScale(
colors = ('green', 'yellow', 'red'),
threshold = (50, 75),
value = 80,
indicator_width = 32,
scale_width = 25)
mega2.pack(side = 'left', padx = 10, pady = 10)
# Create and pack two horizontal ThresholdScale megawidgets.
mega3 = ThresholdScale(
orient = 'horizontal',
labelpos = 'n',
label_text = 'Horizontal')
mega3.pack(side = 'top', padx = 10, pady = 10)
mega4 = ThresholdScale(orient = 'horizontal')
mega4.pack(side = 'top', padx = 10, pady = 10)
# Let's go.
root.mainloop()
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