GUI Programming in Python For Beginners: Create a Timer in 30 Minutes
Bringing Up New Windows
Akkana Peck
Thursday, March 26, 2009 11:54:38 AM
That works fine. But you know what? That little dialog is awfully
easy to miss, especially if you have a big screen with lots of other
windows on it. It would be better to bring up a huge window that
covers the whole screen.
Unfortunately, you can't do much about what tkMessageBox.showinfo() does.
But you can make your own dialog quite easily:
def messageWindow() :
win = Toplevel()
b = Button(win, text='DING DING DING',
bg="blue", fg="yellow",
activebackground="red", activeforeground="white",
command=quit)
b.pack(ipadx=root.winfo_screenwidth()/2,
ipady=root.winfo_screenheight()/2)
root.mainloop()
What's new here?
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First, the button colors: you can set any widget's colors
to anything you like. For a button, the active colors are the
ones it shows when the mouse is over the button, while the base colors
apply when the mouse is somewhere else. (Move your mouse into the
window's title bar to see the color change.)
padx and pady specify how much padding the
button should leave around the text in the middle. If the X padding is
set to half the screen width on either side, then the button will be
at least fill the screen, and likewise with height. Actually this
requests a size slightly bigger than the screen, because the button's
text and the window's titlebar take up some space too.
That's it! You can get more information on Tkinter programming from
the links below.
Links:
Akkana Peck is a freelance programmer and writer and a Python fan;
you can find some of her other Python hacks at http://shallowsky.com/software/
She's also the author of Beginning
GIMP: From Novice to Professional.
======================================================
# Listing 6
#!/usr/bin/env python
from Tkinter import *
def messageWindow() :
win = Toplevel()
b = Button(win, text='DING DING DING',
bg="blue", fg="yellow",
activebackground="red", activeforeground="white",
padx=root.winfo_screenwidth()/2,
pady=root.winfo_screenheight()/2,
command=quit)
b.pack()
root.mainloop()
def show_alert() :
root.bell()
messageWindow()
quit()
def start_timer() :
root.after(scale.get() * 60000, show_alert)
root = Tk()
minutes = Label(root, text="Minutes:")
minutes.grid(row=0, column=0)
scale = Scale(root, from_=1, to=45, orient=HORIZONTAL, length=300)
scale.grid(row=0, column=1)
button = Button(root, text="Start timer", command=start_timer)
button.grid(row=1, column=1, pady=5, sticky=E)
root.mainloop()
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