alice-teacher Alice 3 Event Listener Question

[Emily Higgins]

Thank you, Don.  That makes perfect sense.
Emily

On Sun, Nov 12, 2017 at 4:21 PM, Donald Slater <djslater107 at mac.com> wrote:

> Emily,
> See this attached world, and the explanation I sent in my previous message…
>
> If you set the boolean variable to false in the main method, it will
> become false when the run button is pushed, regardless of when you try to
> trigger the event listener… You have to change the state (or value) of
> isActive as part of some other event, or procedure call
>
> One example of using isActive
>
> mouse click on some thing
> if isActive
> call procedure
> set isActive to false  // here the event will happen only once, unless
> isActive is reset to true in some other event or procedure
>
> another event mouse-click or keypress or some other procedure is called
> set isActive to true
>
> Another example
>
> mouse click on some thing
> if isActive
> call procedure  // here the event will happen until isActive is set to
> false in some other event or procedure call
>
> another event mouse-click or keypress or some other procedure is called
> set isActive to false
>
>
> Let me know if you have any other questions…
>
> All the best,
> Don Slater
>
>
>
>
> On Nov 12, 2017, at 3:59 PM, Emily Higgins <erphiggins at gmail.com> wrote:
>
> I put a global Boolean to turn to false in the main method and then set up
> the event listener to have an if key pressed AND Boolean true, and that did
> not work.
> Emily
>
> On Sun, Nov 12, 2017 at 3:29 PM Joel Caulum <JCaulum at edgewood.edu> wrote:
>
>> Don,
>>
>> Could you send a code sample, preferably in Alice 2, showing an example
>> of what you described here?
>>
>>
>> Thanks,
>>
>> Joel Caulum
>>
>> Computer Science
>>
>> Portage High School
>>
>> Portage, WI
>> ------------------------------
>> *From:* alice-teachers <alice-teachers-bounces+jcaulum=
>> edgewood.edu at lists.andrew.cmu.edu> on behalf of Donald Slater <
>> djslater107 at mac.com>
>> *Sent:* Thursday, November 9, 2017 3:36:54 PM
>> *To:* Alice educators
>> *Subject:* Re: alice-teacher Alice 3 Event Listener Question
>>
>> Emily,
>> One solution would be to create a Boolean variable for the Scene / World,
>> maybe called isActive, with an initial value of true.
>>
>> In the event, create an if... statement
>>         if (isActive)
>>
>> And then the work of the event would be inside the if statement code
>> block...
>>
>> You would set the isActive variable to false at the point in the program
>> where the user should NOT be able to move the wolf.
>>
>> Let me know if you have any questions...
>>
>> All the best,
>> Don Slater
>>
>> Alice Project
>>
>> Sent from my iPad
>>
>> > On Nov 9, 2017, at 2:29 PM, Emily Higgins <erphiggins at gmail.com> wrote:
>> >
>> > Hi All,
>> > I have a problem.  How can I make an event listener stop working?  We
>> have an event listener moving a wolf, and at certain point in the program,
>> the user needs to NOT be able to move the wolf.  I can't figure it out.
>> >
>> > Thank you very much,
>> > Emily Higgins
>> > STEM/Gifted and Talented
>> > Boothbay Region High School
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