Loops & Sleeps
When you call
app.go() you start a loop in the GUI that is constantly checking for events - every time it finds an event, it processes it.
But, if an event takes a long time to process, the GUI loop won't be checking for other events - this is when the GUI hangs (stops processing events).
That's why your events need to be quick - they shouldn't have loops or sleeps.
There are a few ways to get around this problem...
If you want to do something at a later date, you can use the
.after() function to specify when it should happen.
.after(delay_ms, function, *args)
This will cause the specified
functionto be executed after the specified number of milliseconds.
Additional parameters for the function can be specified, by setting
It will return an ID, which can be used to cancel the function, if it hasn't already started.
This will cancel the specified function, if it hasn't already started.
If you just want something to keep happening forever - maybe updating a statusbar or showing a clock, you can use appJar's built in loop.
Any functions registered in this way, are called at set intervals.
This will cause the GUI to keep repeating the named function in the background.
By default, the function will repeat every second.
If you want your functions to be called more or less frequently, change the frequency here.
#function to set the status bar def getLocation(): x,y,z = mc.player.getPos() app.setStatusbar("X: "+ str(round(x,3)), 0) app.setStatusbar("Y: "+ str(round(y,3)), 1) app.setStatusbar("Z: "+ str(round(z,3)), 2) # call the getLocation function every second app.registerEvent(getLocation)
If you want your loop to only repeat a certain number of times or until a condition is met, you can put a decision at the beginning of the function and still use appJar's built in loop.
You can use this method to simulate both
# global variable to store the count counter = 10 def countdown(): global counter if counter > 0: app.setLabel("counter", str(counter)) counter -= 1 app.registerEvent(countdown)
If you want more control over your loops, you can simulate your own...
.after() function mentioned above, you can simulate a loop, by having your function call
# global variable to store the count counter = 10 def acceleratingCountdown(): global counter if counter > 0: app.setLabel("counter", str(counter)) counter -= 1 app.after(100*counter, myLoop) app.after(0, accelratingCountdown)
This will simulate a countdown, but each time there is a smaller delay between counts.
If you want to call a function that does something that takes a long time - such as working with files or networking, you will need a slightly different approach. Have a look at thread support in appJar.