// Default to just targeting creatures. If you specify a targetPos that will be the start, otherwise it will be the position
// of the first valid target if not specified.
public Targeting(Action <Coord> onTargetSelected, Coord targetPos = null, Func <Coord, bool> targetValidator = null)
{
_onTargetSelected = onTargetSelected;
_targetValidator = targetValidator ?? DEFAULT_TARGET_VALIDATOR;
// Create list of valid target locations in FOV, according to our selector
_validTargets = new List <Coord>(GrimDank.Instance.TestLevel.CurrentFOV.Where(_targetValidator));
if (_validTargets.Count == 0)
{
MessageLog.Write("No valid targets.");
InputStack.Remove(this);
GrimDank.Instance.TestLevel.Targeter = null;
}
if (targetPos != null) // -1 if the original given position isn't a valid target, otherwise we start at that point in the list.
{
_currentTargetIndex = _validTargets.FindIndex(c => c == targetPos);
TargetPos = targetPos;
}
else // There are valid targets but we didn't select a position so default to first target in list
{
_currentTargetIndex = 0;
TargetPos = _validTargets[_currentTargetIndex];
}
}
/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
InputStack.Update(gameTime);
TurnManager.Update(gameTime);
base.Update(gameTime);
}
public bool HandleKeyboard(Keys key, ModifierState modifierState)
{
Direction dirToMove = Controls.Move(key);
bool handled = true;
if (dirToMove == Direction.NONE)
{
switch (key)
{
case Keys.Enter:
if (_targetValidator(TargetPos)) // CurrentPos is valid
{
InputStack.Remove(this);
GrimDank.Instance.TestLevel.Targeter = null;
_onTargetSelected(TargetPos);
}
else
{
MessageLog.Write("Invalid target.");
}
break;
case Keys.Add:
// This works even if we started at -1.
if (_validTargets.Count != 0)
{
_currentTargetIndex = MathHelpers.WrapAround(_currentTargetIndex + 1, _validTargets.Count);
TargetPos = _validTargets[_currentTargetIndex];
}
break;
case Keys.Escape:
InputStack.Remove(this);
GrimDank.Instance.TestLevel.Targeter = null;
break;
default:
handled = false;
break;
}
}
// Here we purposely do NOT reset the _currentTargetIndex to -1, to preserve the starting point in case the user presses + sometime again
// in the future (we pick up where we left off)
else
{
TargetPos += dirToMove;
}
return(handled);
}
public GlobalKeyHandler()
{
InputStack.Add(this);
}