Pmw/Pmw_1_2/doc/example.py

   1 import Tkinter
   2 import Pmw
   3
   4 class ThresholdScale(Pmw.MegaWidget):
   5     """ Megawidget containing a scale and an indicator.
   6     """
   7
   8     def __init__(self, parent = None, **kw):
   9
  10         # Define the megawidget options.
  11         optiondefs = (
  12             ('colors',    ('green', 'red'), None),
  13             ('threshold', 50,               None),
  14             ('value',     None,             Pmw.INITOPT),
  15         )
  16         self.defineoptions(kw, optiondefs)
  17
  18         # Initialise base class (after defining options).
  19         Pmw.MegaWidget.__init__(self, parent)
  20
  21         # Create the components.
  22         interior = self.interior()
  23
  24         # Create the indicator component.
  25         self.indicator = self.createcomponent('indicator',
  26                 (), None,
  27                 Tkinter.Frame, interior,
  28                         width = 16,
  29                         height = 16,
  30                         borderwidth = 2,
  31                         relief = 'raised')
  32         self.indicator.grid()
  33
  34         # Create the scale component.
  35         self.scale = self.createcomponent('scale',
  36                 (), None,
  37                 Tkinter.Scale, interior,
  38                         command = self._doCommand,
  39                         tickinterval = 20,
  40                         length = 200,
  41                         from_ = 100,
  42                         to = 0,
  43                         showvalue = 0)
  44         self.scale.grid()
  45
  46         value = self['value']
  47         if value is not None:
  48             self.scale.set(value)
  49
  50         # Check keywords and initialise options.
  51         self.initialiseoptions()
  52
  53     def _doCommand(self, valueStr):
  54         if self.scale.get() > self['threshold']:
  55             color = self['colors'][1]
  56         else:
  57             color = self['colors'][0]
  58         self.indicator.configure(background = color)
  59
  60 Pmw.forwardmethods(ThresholdScale, Tkinter.Scale, 'scale')
  61
  62 # Initialise Tkinter and Pmw.
  63 root = Pmw.initialise()
  64 root.title('Pmw ThresholdScale demonstration')
  65
  66 # Create and pack two ThresholdScale megawidgets.
  67 mega1 = ThresholdScale()
  68 mega1.pack(side = 'left', padx = 10, pady = 10)
  69
  70 mega2 = ThresholdScale(
  71         colors = ('green', 'yellow'),
  72         threshold = 75,
  73         value = 80,
  74         indicator_width = 32,
  75         scale_width = 25)
  76 mega2.pack(side = 'left', padx = 10, pady = 10)
  77
  78 # Let's go.
  79 root.mainloop()