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So, we're gonna do a pop-up window, an
alert window, like you do with JavaScript.

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And TkInter has one.

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But we can't use it from TkInter.whatever.

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We have to import it on its own.

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So, we'll say from tkinter
import messagebox.

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And there are a lot of
different message boxes.

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Some ask a question and
the user can answer with a yes or no.

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Others accept input,
like a text box to take in information.

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And some, like the one that we're gonna
use, are just for sharing information.

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So, it's just going to put out a message.

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So let's go down here.

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Let's make a new function.

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And we're going to call it
alert cuz it's our alert.

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And since it's going to get triggered,
as well, we need it to take args.

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All right.

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So, we're gonna say,
if not self.time left.get().

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So, if there are no seconds left,
then we want to do message box.showinfo().

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And then the title that
we want on the window,

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this right here says pymodoro.pi gui blah,
blah, blah.

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We want that to say Timer done.

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I suppose it could say Pymodoro or
something.

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And then our message is just going to be,
Your timer is done!

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Super, super exciting [LAUGH] there.

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Okay, but now,
how do I want to fire this off?

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So, we need to actually watch for
stuff to happen and then fire this off.

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And this really make sense to have
fired whenever this runs out.

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Now, I don't want to do it and
update because that's weird.

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I've had to watch for running conditions
and make sure the start button is disabled

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or the stop button is enabled, and
then, it's just a lot of trouble.

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So, let's not worry about that.

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Let's do it with another trace.

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So, if we come back up here to our init,
and we have this time left.

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Let's do self.time_left.trace, and

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we want whenever this is written to,
to call self.alert.

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So, whenever our update method changes
the number of seconds that are left,

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our alert method checks to see if
it should fire the message box.

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Let's try this out.

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And I have a feeling this may
end up firing off a second or

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two early due to the order of stuff.

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But not that big of a deal, especially
not in something that we're just like,

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[NOISE] let's see what we can build.

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Feel free to experiment and
see if you can make it not do that.

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But let's see, so four, three, two, one.

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Our timer's done, cool.

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So, yeah,
you can see it's about a second early,

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it fires off, but not that big of a deal.

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So, there you go.

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In just a few short videos, and
I don't know, 100 lines of code?

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Let's see, how many lines did we add here?

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114!

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114 lines of code, a few short videos,
we have built a fully function Pymodoro

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application that'll let us do
a lot of work very, very quickly.

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While our little app might not do much, it
gives us a good glimpse of what all we can

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do with the Kintor and the rest of Python.

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Whether you're building your whole app
into Kintor or just using it at a proof

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of concept, I think this library
will serve you well in the future.

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I know people making games in it, and
even using TkIntor to control lasers.

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I can't wait to see what you do with it.