Home | History | Annotate | Download | only in ttk 
      1 """Sample demo showing widget states and some font styling."""
      2 import ttk
      3 
      4 states = ['active', 'disabled', 'focus', 'pressed', 'selected',
      5           'background', 'readonly', 'alternate', 'invalid']
      6 
      7 for state in states[:]:
      8     states.append("!" + state)
      9 
     10 def reset_state(widget):
     11     nostate = states[len(states) // 2:]
     12     widget.state(nostate)
     13 
     14 class App(ttk.Frame):
     15     def __init__(self, title=None):
     16         ttk.Frame.__init__(self, borderwidth=6)
     17         self.master.title(title)
     18 
     19         self.style = ttk.Style()
     20 
     21         # get default font size and family
     22         btn_font = self.style.lookup("TButton", "font")
     23         fsize = str(self.tk.eval("font configure %s -size" % btn_font))
     24         self.font_family = self.tk.eval("font configure %s -family" % btn_font)
     25         if ' ' in self.font_family:
     26             self.font_family = '{%s}' % self.font_family
     27         self.fsize_prefix = fsize[0] if fsize[0] == '-' else ''
     28         self.base_fsize = int(fsize[1 if fsize[0] == '-' else 0:])
     29 
     30         # a list to hold all the widgets that will have their states changed
     31         self.update_widgets = []
     32 
     33         self._setup_widgets()
     34 
     35     def _set_font(self, extra=0):
     36         self.style.configure("TButton", font="%s %s%d" % (self.font_family,
     37             self.fsize_prefix, self.base_fsize + extra))
     38 
     39     def _new_state(self, widget, newtext):
     40         widget = self.nametowidget(widget)
     41 
     42         if not newtext:
     43             goodstates = ["disabled"]
     44             font_extra = 0
     45         else:
     46             # set widget state according to what has been entered in the entry
     47             newstates = set(newtext.split()) # eliminate duplicates
     48 
     49             # keep only the valid states
     50             goodstates = [state for state in newstates if state in states]
     51             # define a new font size based on amount of states
     52             font_extra = 2 * len(goodstates)
     53 
     54         # set new widget state
     55         for widget in self.update_widgets:
     56             reset_state(widget) # remove any previous state from the widget
     57             widget.state(goodstates)
     58 
     59         # update Ttk Button font size
     60         self._set_font(font_extra)
     61         return 1
     62 
     63     def _setup_widgets(self):
     64         btn = ttk.Button(self, text='Enter states and watch')
     65 
     66         entry = ttk.Entry(self, cursor='xterm', validate="key")
     67         entry['validatecommand'] = (self.register(self._new_state), '%W', '%P')
     68         entry.focus()
     69 
     70         self.update_widgets.append(btn)
     71         entry.validate()
     72 
     73         entry.pack(fill='x', padx=6)
     74         btn.pack(side='left', pady=6, padx=6, anchor='n')
     75         self.pack(fill='both', expand=1)
     76 
     77 
     78 def main():
     79     app = App("Widget State Tester")
     80     app.mainloop()
     81 
     82 if __name__ == "__main__":
     83     main()
     84