46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
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"""UNWRITTEN - modal input dispatch. Owner: Agent A.
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One InputStack per scene owns scene.on_key and dispatches to a stack of
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handlers, top-most first. A handler is fn(key, state) -> bool; returning True
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consumes the event (lower handlers do not see it). Overworld pushes its
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movement handler; a DialogueBox / menu pushes itself while open and pops on
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close, freezing everything beneath it.
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"""
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class InputStack:
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def __init__(self, scene):
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self.scene = scene
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self.stack = [] # list of (name, handler)
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scene.on_key = self._dispatch
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def push(self, handler, name=""):
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self.stack.append((name, handler))
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def pop(self, name=""):
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"""Pop the top handler, or the top-most handler matching name."""
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if name:
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for i in range(len(self.stack) - 1, -1, -1):
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if self.stack[i][0] == name:
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return self.stack.pop(i)
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return None
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if self.stack:
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return self.stack.pop()
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return None
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def replace(self, handler, name=""):
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"""Replace the top handler with a new one."""
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self.pop()
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self.push(handler, name)
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def clear(self):
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self.stack = []
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def has(self, name):
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return any(n == name for n, _ in self.stack)
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def _dispatch(self, key, state):
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for i in range(len(self.stack) - 1, -1, -1):
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handler = self.stack[i][1]
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if handler(key, state):
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return
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