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| '''Michael Lange <klappnase at 8ung.at>
The Meter class provides a simple progress bar widget for Tkinter.
INITIALIZATION OPTIONS:
The widget accepts all options of a Tkinter.Frame plus the following:
fillcolor -- the color that is used to indicate the progress of the
corresponding process; default is "orchid1".
value -- a float value between 0.0 and 1.0 (corresponding to 0% - 100%)
that represents the current status of the process; values higher
than 1.0 (lower than 0.0) are automagically set to 1.0 (0.0); default is 0.0 .
text -- the text that is displayed inside the widget; if set to None the widget
displays its value as percentage; if you don't want any text, use text="";
default is None.
font -- the font to use for the widget's text; the default is system specific.
textcolor -- the color to use for the widget's text; default is "black".
WIDGET METHODS:
All methods of a Tkinter.Frame can be used; additionally there are two widget specific methods:
get() -- returns a tuple of the form (value, text)
set(value, text) -- updates the widget's value and the displayed text;
if value is omitted it defaults to 0.0 , text defaults to None .
'''
import Tkinter
class Meter(Tkinter.Frame):
def __init__(self, master, width=300, height=20, bg='white', fillcolor='orchid1',\
value=0.0, text=None, font=None, textcolor='black', *args, **kw):
Tkinter.Frame.__init__(self, master, bg=bg, width=width, height=height, *args, **kw)
self._value = value
self._canv = Tkinter.Canvas(self, bg=self['bg'], width=self['width'], height=self['height'],\
highlightthickness=0, relief='flat', bd=0)
self._canv.pack(fill='both', expand=1)
self._rect = self._canv.create_rectangle(0, 0, 0, self._canv.winfo_reqheight(), fill=fillcolor,\
width=0)
self._text = self._canv.create_text(self._canv.winfo_reqwidth()/2, self._canv.winfo_reqheight()/2,\
text='', fill=textcolor)
if font:
self._canv.itemconfigure(self._text, font=font)
self.set(value, text)
self.bind('<Configure>', self._update_coords)
def _update_coords(self, event):
'''Updates the position of the text and rectangle inside the canvas when the size of
the widget gets changed.'''
# looks like we have to call update_idletasks() twice to make sure
# to get the results we expect
self._canv.update_idletasks()
self._canv.coords(self._text, self._canv.winfo_width()/2, self._canv.winfo_height()/2)
self._canv.coords(self._rect, 0, 0, self._canv.winfo_width()*self._value, self._canv.winfo_height())
self._canv.update_idletasks()
def get(self):
return self._value, self._canv.itemcget(self._text, 'text')
def set(self, value=0.0, text=None):
#make the value failsafe:
if value < 0.0:
value = 0.0
elif value > 1.0:
value = 1.0
self._value = value
if text == None:
#if no text is specified use the default percentage string:
text = str(int(round(100 * value))) + ' %'
self._canv.coords(self._rect, 0, 0, self._canv.winfo_width()*value, self._canv.winfo_height())
self._canv.itemconfigure(self._text, text=text)
self._canv.update_idletasks()
##-------------demo code--------------------------------------------##
def _demo(meter, value):
meter.set(value)
if value < 1.0:
value = value + 0.005
meter.after(50, lambda: _demo(meter, value))
else:
meter.set(value, 'Demo successfully finished')
if __name__ == '__main__':
root = Tkinter.Tk(className='meter demo')
m = Meter(root, relief='ridge', bd=3)
m.pack(fill='x')
m.set(0.0, 'Starting demo...')
m.after(1000, lambda: _demo(m, 0.0))
root.mainloop() |
