ここで見つけたコードを使用しています: http://svn.python.org/projects/python/branches/pep-0384/Demo/tkinter/ttk/roundframe.py角が丸いフレームが得られます。( Bryan Oakley による関連記事へのリンクはこちら)。ただし、そのスタイルを使用して作成されたフレームの背景に色を付けたいと考えています。
"""Ttk Frame with rounded corners.
Based on an example by Bryan Oakley, found at: http://wiki.tcl.tk/20152"""
import tkinter
from tkinter import ttk
root = tkinter.Tk()
img1 = tkinter.PhotoImage("frameFocusBorder", data="""
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img2 = tkinter.PhotoImage("frameBorder", data="""
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style = ttk.Style()
style.element_create("RoundedFrame", "image", "frameBorder",
("focus", "frameFocusBorder"), border=16, sticky="nsew")
style.layout("RoundedFrame", [("RoundedFrame", {"sticky": "nsew"})])
style.configure("TEntry", borderwidth=0)
frame = ttk.Frame(style="RoundedFrame", padding=10)
frame.pack(fill='x')
frame2 = ttk.Frame(style="RoundedFrame", padding=10)
frame2.pack(fill='both', expand=1)
entry = ttk.Entry(frame, text='Test')
entry.pack(fill='x')
entry.bind("<FocusIn>", lambda evt: frame.state(["focus"]))
entry.bind("<FocusOut>", lambda evt: frame.state(["!focus"]))
text = tkinter.Text(frame2, borderwidth=0, bg="white", highlightthickness=0)
text.pack(fill='both', expand=1)
text.bind("<FocusIn>", lambda evt: frame2.state(["focus"]))
text.bind("<FocusOut>", lambda evt: frame2.state(["!focus"]))
root.mainloop()
そのファイルが行うことは、画像をスタイルシートとして適用することであり、その画像は巨大なテキストブロックであるように私には見えます。その結果、スタイル自体またはフレームの背景色を指定しようとすると、Python は次のように返します_tkinter.TclError: unknown option "-bg"。
解決策はイメージを変えることだと思います。いくつかの調査の後、明らかに PhotoImage クラスが「base64 でエンコードされた GIF ファイル」を文字列として受け取ることがわかりました。これをデコードするにはどうすればよいでしょうか。フレームを適切に変更できるようにするには、どの画像形式を PhotoImage にフィードすればよいでしょうか?