50 lines
1.8 KiB
Python
50 lines
1.8 KiB
Python
"""在大屏 JSON 副本上移动组件，用于后端校验动作能否执行"""
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from app.actions.base import BaseActionHandler
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from app.schemas.actions import MoveAction
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from app.schemas.screen import Layout, Screen
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class MoveHandler(BaseActionHandler[MoveAction]):
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def apply(self, screen: Screen, action: MoveAction) -> Screen:
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# 确认移动目标存在，并取得大屏副本及副本中的目标节点
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result, target = self.copy_target(screen, action.target_id)
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# 将现有布局转成字典，保留尺寸和其他布局字段
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layout = target.layout.model_dump()
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# 在原坐标上叠加相对位移，不将 delta_x 和 delta_y 当作绝对坐标
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layout["x"] += action.delta_x
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layout["y"] += action.delta_y
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# 重新校验计算结果，防止浮点溢出产生无效坐标
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target.layout = Layout.model_validate(layout)
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# 返回移动后的大屏副本，供下一条动作继续使用
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return result
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if __name__ == "__main__":
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screen = Screen.model_validate(
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{
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"canvas": {"width": 1920, "height": 1080},
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"nodes": [
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{
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"id": "sales-chart",
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"type": "chart",
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"layout": {"x": 100, "y": 200, "width": 400, "height": 300},
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}
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],
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}
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)
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action = MoveAction(target_id="sales-chart", delta_x=50)
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handler = MoveHandler()
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final_screen = handler.apply(screen, action)
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print(final_screen.model_dump_json(indent=2))
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print("原始坐标:", screen.nodes[0].layout.x, screen.nodes[0].layout.y)
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try:
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handler.apply(screen, MoveAction(target_id="missing", delta_x=50))
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except ValueError as error:
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print("无效目标:", error)
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