Crouching Up and Down XNA C# Controller

Question

The game is a 2D platformer.

The problem I have is when I press the B button to crouch from standing, I do not know how to implement a function where B can be pressed again to move back to the standing sprite.

the issue is if i use the code presented below it will check every frame for B == Pressed, basically appearing as if the player never crouched at all. Could somebody help please?

if (facingRightSide == true)
        {
            if (currPad.Buttons.B == ButtonState.Pressed)
            {
                m_currState = AnimState.CrouchRight; 
                isCrouchedRight = true;                                
            }
        }

if (isCrouchedRight == true)
        {
            if (currPad.Buttons.B == ButtonState.Pressed)
            {
                m_currState = AnimState.FacingRight;
                isCrouchedRight = false;
            }
        }

Thank you for your time.

Answer 1

Try implementing a property to keep track of your previous pressed state.

So then you can do something like this instead:

ButtonState PreviousButtonState;

// Only action button press once
if (PreviousButtonState.Buttons.B != ButtonState.Pressed && currPad.Buttons.B == ButtonState.Pressed)
{
    if (m_currState == AnimState.FacingRight) {
        m_currState = AnimState.CrouchRight; 
    } else if (m_currState == AnimState.CrouchRight) {
        m_currState = AnimState.FacingRight; 
    }
}

//Store the previous button state for next iteration
PreviousButtonState = currPad;