Tkinter: How to make a rounded corner text widget?
Question
How to create a rounded corner text widget? I think I have an idea of creating a rounded canvas and fill the entire canvas with the text box with no border.
Problem
The code to create a rounded border canvas is not working when I try to extend the height and width of the canvas. The line breaks and becomes discontinuous.
The code to create rounded corner canvas is taken from How to make a tkinter canvas rectangle with rounded corners?
My code with custom width and height
def rounded_rect(canvas, x, y, w, h, c):
canvas.create_arc(x, y, x+2*c, y+2*c, start= 90, extent=90, style="arc")
canvas.create_arc(x+w-2*c, y+h-2*c, x+w, y+h, start=270, extent=90, style="arc")
canvas.create_arc(x+w-2*c, y, x+w, y+2*c, start= 0, extent=90, style="arc")
canvas.create_arc(x, y+h-2*c, x+2*c, y+h, start=180, extent=90, style="arc")
canvas.create_line(x+c, y, x+w-c, y )
canvas.create_line(x+c, y+h, x+w-c, y+h )
canvas.create_line(x, y+c, x, y+h-c)
canvas.create_line(x+w, y+c, x+w, y+h-c)
import tkinter
root = tkinter.Tk()
canvas = tkinter.Canvas(root)
canvas.grid(row=0,column=0)
# The width and height has been changed from the original solution
rounded_rect(canvas, 10, 10, 330, 290, 10)
root.mainloop()
Output
Answer
One solution is to use a ttk frame with a custom style that uses an image for the corners.
The following example is adapted from a tcl/tk solution I wrote back in 2007. It uses an odd color for the focus, and requires a white background, but you could create your own image to replace the one used in this solution (or edit the image in this example1)
# adapted from http://wiki.tcl.tk/%0920152
import tkinter as tk
from tkinter import ttk
focusBorderImageData = '''
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zKyurOzu7JyenNze3Ly+vPz+/OkAKOUA5IEAEnwAAACuQACUAAFBAAB+AFYd
QAC0AABBAAB+AIjMAuEEABINAAAAAHMgAQAAAAAAAAAAAKjSxOIEJBIIpQAA
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AHwAAIXYAOfxAIESAHwAAABAMQAbMBZGMAAAIEggJQMAIAAAAAAAfqgaXESI
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AACQDADjAAASAAAAAACAAADVABZBAAB+ALjMwOIEhxINUAAAANIgAOYAAIEA
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Ry/99NIz//oGrZpUUEAAOw==
'''
borderImageData = '''
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'''
root = tk.Tk()
style = ttk.Style()
borderImage = tk.PhotoImage("borderImage", data=borderImageData)
focusBorderImage = tk.PhotoImage("focusBorderImage", data=focusBorderImageData)
style.element_create("RoundedFrame",
"image", borderImage,
("focus", focusBorderImage),
border=16, sticky="nsew")
style.layout("RoundedFrame",
[("RoundedFrame", {"sticky": "nsew"})])
frame1 = ttk.Frame(style="RoundedFrame", padding=10)
text1 = tk.Text(frame1, borderwidth=0, highlightthickness=0, wrap="word",
width=40, height=4)
text1.pack(fill="both", expand=True)
text1.bind("<FocusIn>", lambda event: frame1.state(["focus"]))
text1.bind("<FocusOut>", lambda event: frame1.state(["!focus"]))
text1.insert("end", "This widget has the focus")
frame2 = ttk.Frame(style="RoundedFrame", padding=10)
text2 = tk.Text(frame2, borderwidth=0, highlightthickness=0, wrap="word",
width=40, height=4)
text2.pack(fill="both", expand=True)
text2.bind("<FocusIn>", lambda event: frame2.state(["focus"]))
text2.bind("<FocusOut>", lambda event: frame2.state(["!focus"]))
text2.insert("end", "This widget does not have the focus")
root.configure(background="white")
frame1.pack(side="top", fill="both", expand=True, padx=20, pady=20)
frame2.pack(side="top", fill="both", expand=True, padx=20, pady=20)
frame1.focus_set()
root.mainloop()
1The image data is a base64-encoded gif. If you decode the data and save it to a .gif file, you can edit it to use any colors you want.