Chapter 9 - GUI Programming using Tkinter - Programming Exercises - Page 308: 9.23

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# 9.23 (Buttons and radio buttons) Write a program that uses radio buttons to select background # colors for text, as shown in Figure 9.34. The available colors are red, yellow, # white, gray, and green. The program uses the buttons and to move # the text left or right. from tkinter import * class MainGUI: def __init__(self): window = Tk() menuBar = Menu(window) window.config(menu=menuBar) menuBar.add_radiobutton(label="red", command=self.red) menuBar.add_radiobutton(label="yellow", command=self.yellow) menuBar.add_radiobutton(label="white", command=self.white) menuBar.add_radiobutton(label="gray", command=self.gray) menuBar.add_radiobutton(label="green", command=self.green) self.canvas = Canvas(window, width=250, height=50, bg="white") self.x = 35 self.color = "white" self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color) self.canvas.tag_lower(self.b, self.txt) self.canvas.pack() frame = Frame(window) frame.pack() btnR = Button(frame, text="<=", command=self.right) btnR.grid(row=1, column=1) btnL = Button(frame, text="=>", command=self.left) btnL.grid(row=1, column=2) window.mainloop() def red(self): self.canvas.delete("all") self.color = "red" self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) def green(self): self.canvas.delete("all") self.color = "green" self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) def white(self): self.canvas.delete("all") self.color = "white" self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) def yellow(self): self.canvas.delete("all") self.color = "yellow" self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) def gray(self): self.canvas.delete("all") self.color = "gray" self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) def left(self): if self.x < 220: self.canvas.delete("all") self.x += 2 self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) def right(self): if self.x > 35: self.canvas.delete("all") self.x -= 2 self.txt = self.canvas.create_text(self.x, 25, text="Welcome", tags="txt") self.b = self.canvas.create_rectangle(self.canvas.bbox(self.txt), fill=self.color, tags="rec") self.canvas.tag_lower(self.b, self.txt) MainGUI()