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