| """Sample demo showing widget states and some font styling.""" |
| import ttk |
| |
| states = ['active', 'disabled', 'focus', 'pressed', 'selected', |
| 'background', 'readonly', 'alternate', 'invalid'] |
| |
| for state in states[:]: |
| states.append("!" + state) |
| |
| def reset_state(widget): |
| nostate = states[len(states) // 2:] |
| widget.state(nostate) |
| |
| class App(ttk.Frame): |
| def __init__(self, title=None): |
| ttk.Frame.__init__(self, borderwidth=6) |
| self.master.title(title) |
| |
| self.style = ttk.Style() |
| |
| # get default font size and family |
| btn_font = self.style.lookup("TButton", "font") |
| fsize = str(self.tk.eval("font configure %s -size" % btn_font)) |
| self.font_family = self.tk.eval("font configure %s -family" % btn_font) |
| if ' ' in self.font_family: |
| self.font_family = '{%s}' % self.font_family |
| self.fsize_prefix = fsize[0] if fsize[0] == '-' else '' |
| self.base_fsize = int(fsize[1 if fsize[0] == '-' else 0:]) |
| |
| # a list to hold all the widgets that will have their states changed |
| self.update_widgets = [] |
| |
| self._setup_widgets() |
| |
| def _set_font(self, extra=0): |
| self.style.configure("TButton", font="%s %s%d" % (self.font_family, |
| self.fsize_prefix, self.base_fsize + extra)) |
| |
| def _new_state(self, widget, newtext): |
| widget = self.nametowidget(widget) |
| |
| if not newtext: |
| goodstates = ["disabled"] |
| font_extra = 0 |
| else: |
| # set widget state according to what has been entered in the entry |
| newstates = set(newtext.split()) # eliminate duplicates |
| |
| # keep only the valid states |
| goodstates = [state for state in newstates if state in states] |
| # define a new font size based on amount of states |
| font_extra = 2 * len(goodstates) |
| |
| # set new widget state |
| for widget in self.update_widgets: |
| reset_state(widget) # remove any previous state from the widget |
| widget.state(goodstates) |
| |
| # update Ttk Button font size |
| self._set_font(font_extra) |
| return 1 |
| |
| def _setup_widgets(self): |
| btn = ttk.Button(self, text='Enter states and watch') |
| |
| entry = ttk.Entry(self, cursor='xterm', validate="key") |
| entry['validatecommand'] = (self.register(self._new_state), '%W', '%P') |
| entry.focus() |
| |
| self.update_widgets.append(btn) |
| entry.validate() |
| |
| entry.pack(fill='x', padx=6) |
| btn.pack(side='left', pady=6, padx=6, anchor='n') |
| self.pack(fill='both', expand=1) |
| |
| |
| def main(): |
| app = App("Widget State Tester") |
| app.mainloop() |
| |
| if __name__ == "__main__": |
| main() |
