Action button: only true once per press

Question

I'm using SFML2.0 and am trying to make a wrapper class for my controller/joystick. I read all the input data from my controller and send it off to my controllable object.

I want to have two types of buttons per button press, one that is continues(true false state ) and one that is an action and is set to false after the next frame update.

Here is an example of how I set my button A to true or false with the SFML api. Whereas data is my struct of buttons, and A holds my true/false state every update.

data.A = sf::Joystick::isButtonPressed(i,st::input::A);

But I've also added "data.actionA" which represents the one time action state.

Basically what I want is for actionA to be set false after the update its been set to true. I'm trying to keep track of the previous state. But I seem to fall into this loop where it toggles between true and false every update.

Anyone an idea?

Nick Caplinger · Accepted Answer · 2013-06-03 04:59:10Z

Here's some pseudo code for you to try

// This here is a global variable. ... bool wasButtonPressed = false; ... // This here is your function. ... bool isButtonPressed = sf::Joystick::isButtonPressed(i,st::input::A); // Check if the key was pressed since last frame, aka KeyPressed. if(isButtonPressed && !wasButtonPressed) someFunction(); // Check if the key was held since last frame, aka KeyHeld. if(isButtonPressed && wasButtonPressed) someFunction(); // Check if the key was released since last frame, aka KeyReleased. if(!isButtonPressed && wasButtonPressed) someFunction(); wasButtonPressed = isButtonPressed; ...

We store the previous state, so we know how the key has changed since the last frame.

Yes I already solved it myself ( see edit ). I was already keeping track of previous states. I was overthinking it. — Sidar
– Sidar, Commented Jun 20, 2012 at 16:08

Sidar · Accepted Answer · 2012-06-20 16:08:54Z

My solution:

data.actionA = data.A = sf::Joystick::isButtonPressed(i,st::input::A); if(prev.A) data.actionA = false;

First I always set the actionA to the value of the button state. Then I check if the previous state of A is true. If so we negate the value.

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