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Without much work, when you hold a button, it can do things the button was set to do for a repeated amount of times. However, if you want to make the button be not held, but only pressed once at a time, you can use the scripting in this tutorial.
What To Do
This is the script which will allow holding, which you want to avoid:
when flag clicked forever if <key [... v] pressed?> then next backdrop end end
If you use this one, you might go forward more than one backdrop before you release the key. You can also use this one:
when [... v] key pressed next backdrop
This is the script which does not allow holding, which you will want to use.
when flag clicked forever wait until <key [... v] pressed> next backdrop wait until <not <key [... v] pressed?>> end
This will make it sense the key, perform an action, and wait for the key to be released before checking again. You can also change the order to:
when flag clicked forever wait until <key [... v] pressed?> wait until <not <key [... v] pressed?>> next backdrop
If you use this code, you have to press the key, and the backdrop will not change until you release it.
Let's say you are making a platformer, this can be useful when you run into issues
when [... v] key pressed forever wait until <not <key [... v] pressed?>> broadcast [... v] stop [this script v]
and then you want to make this:
when I receive [... v] next backdrop
A key tapping sensor could be useful for many things, such as announcement projects, or projects with only words. It's often important in these projects, that users don't skip through the information quickly, so this script could be useful. If one wants to create a platformer, the first code could be used to to create nice, smooth controls.