140 lines
3.7 KiB
Python
140 lines
3.7 KiB
Python
from tkinter import *
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from tkinter import ttk
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status = 1 # 1 - neue Eingabe, 2 - Eingabe verarbeitet
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def switch_status(new_status: int = None):
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""" Verändert den globalen Status
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:param new_status: neuer Statuswert
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:return: None
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"""
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global status
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if not new_status:
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if status == 1:
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status = 2
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else:
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status = 1
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else:
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status = new_status
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update_statusbar()
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def update_statusbar():
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""" Passt die Farbe der Statuszeile an den Status an.
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:return: None
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"""
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global status
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if status == 1:
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frame_statusbar['style'] = 'aFrame.TFrame'
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elif status == 2:
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frame_statusbar['style'] = 'bFrame.TFrame'
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else:
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frame_statusbar['style'] = 'bFrame.TFrame'
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def calculate(*args):
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""" Berechnet aus der eingegebenen Länge in feet die Länge in Metern.
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:param args:
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:return: None
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"""
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try:
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stringvalue = feet.get()
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stringvalue = stringvalue.replace(",", ".")
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value = float(stringvalue)
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m_value = 0.3048 * value
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m_value = round(m_value, 2)
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meters.set(m_value)
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switch_status(2)
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except ValueError:
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pass
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return True
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def check_entry(what: str = ""):
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""" Validiert, ob Eingabe leer oder eine Fließkommazahl ist.
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:param what: str eingegebene Zeichenkette
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:return: boolean
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"""
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switch_status(1)
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if what == "":
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# Nichts eingegeben
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return True
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else:
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try:
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# DEBUG
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print(what)
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what = what.replace(',', '.')
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float(what)
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return True
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except ValueError:
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return False
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# Hauptfenster
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root = Tk()
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root.title("Feet to Meters")
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check_entry_wrapper = root.register(check_entry)
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# Rahmen im Hauptfenster (aus ttk für Farbanpassung)
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mainframe = ttk.Frame(root, padding="3 3 12 12")
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mainframe.grid(column=0, row=0, sticky=NW)
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root.columnconfigure(0, weight=1)
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root.rowconfigure(0, weight=1)
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# Eingabefeld für Länge in feet
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feet = StringVar()
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feet_entry = ttk.Entry(mainframe, width=7, textvariable=feet,
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validatecommand=(check_entry_wrapper, '%P'),
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validate='key')
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feet_entry.grid(column=2, row=1, sticky=W + E)
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# Einheit-Label für Eingabefeld der Länge in feet
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ttk.Label(mainframe, text="feet").grid(column=3, row=1, sticky=W)
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# Label für Ausgabefeld der Länge in Metern
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ttk.Label(mainframe, text="ist äquivalent zu").grid(column=1, row=2, sticky=E)
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# Einheit-Label für Ausgabefeld der Länge in Metern
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ttk.Label(mainframe, text="Meter").grid(column=3, row=2, sticky=W)
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# Ausgabefeld für Länge in Metern
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meters = StringVar()
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meters_entry = ttk.Entry(mainframe, width=7, textvariable=meters)
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meters_entry.grid(column=2, row=2, sticky=(W, E))
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meters_entry.configure(state='readonly') # keine Eingabe, aber selektierbar
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# Button für Berechnung
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button_calc = ttk.Button(mainframe, text="Berechne", command=calculate)
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button_calc.grid(column=3, row=3, sticky=W)
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# schönere Abstände
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for child in mainframe.winfo_children():
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child.grid_configure(padx=5, pady=5)
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# Statusbar
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s = ttk.Style()
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s.configure('aFrame.TFrame', background="yellow")
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s.configure('bFrame.TFrame', background="green")
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s.configure('cFrame.TFrame', background="red")
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frame_statusbar = ttk.Frame(root)
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frame_statusbar['relief'] = 'sunken'
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frame_statusbar['height'] = 12
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frame_statusbar['style'] = 'aFrame.TFrame'
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frame_statusbar.grid_propagate(0) # Feste Größe an Grid-Packer weitergeben
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frame_statusbar.grid(column=0, row=1, sticky=W + S + E)
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# Setze Fokus in Eingabefeld
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feet_entry.focus()
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root.bind("<Return>", calculate)
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root.bind("<KP_Enter>", calculate)
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root.mainloop()
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