/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.input.logical;
import com.ardor3d.annotation.Immutable;
import com.ardor3d.input.ButtonState;
import com.ardor3d.input.InputState;
import com.ardor3d.input.MouseButton;
import com.google.common.base.Predicate;
/**
* A condition that is true if a given button was pressed when going from the previous input state to the current one.
*/
@Immutable
public final class MouseButtonReleasedCondition implements Predicate<TwoInputStates> {
private final MouseButton _button;
/**
* Construct a new MouseButtonPressedCondition.
*
* @param button
* the button that should be pressed to trigger this condition
* @throws NullPointerException
* if the button is null
*/
public MouseButtonReleasedCondition(final MouseButton button) {
if (button == null) {
throw new NullPointerException();
}
_button = button;
}
public boolean apply(final TwoInputStates states) {
final InputState currentState = states.getCurrent();
final InputState previousState = states.getPrevious();
if (currentState == null || previousState == null
|| !previousState.getMouseState().hasButtonState(ButtonState.DOWN)) {
return false;
}
return currentState.getMouseState().getButtonsReleasedSince(previousState.getMouseState()).contains(_button);
}
}