forked from AG_QGIS/Plugin_SN_Plan41
133 lines
3.6 KiB
Python
133 lines
3.6 KiB
Python
"""
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sn_plan41/ui/tab_a_logic.py – Fachlogik für Tab A (Daten)
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"""
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from typing import Optional
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from sn_basis.functions.variable_wrapper import (#type: ignore
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get_variable,
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set_variable,
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)
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from sn_basis.functions.sys_wrapper import (#type:ignore
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file_exists,
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write_text,
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)
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from sn_basis.functions.ly_existence_wrapper import layer_exists#type:ignore
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from sn_basis.functions.ly_metadata_wrapper import get_layer_type#type:ignore
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class TabALogic:
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"""
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Kapselt die komplette Logik von Tab A:
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- Verfahrens-Datenbank
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- optionale Linkliste
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- Verfahrensgebiet-Layer
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"""
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# -------------------------------
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# Verfahrens-Datenbank
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# -------------------------------
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def load_verfahrens_db(self) -> Optional[str]:
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"""
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Lädt die gespeicherte Verfahrens-Datenbank.
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"""
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path = get_variable("verfahrens_db", scope="project")
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if path and file_exists(path):
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return path
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return None
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def set_verfahrens_db(self, path: Optional[str]) -> None:
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"""
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Speichert oder löscht die Verfahrens-Datenbank.
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"""
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if path:
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set_variable("verfahrens_db", path, scope="project")
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else:
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set_variable("verfahrens_db", "", scope="project")
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def create_new_verfahrens_db(self, path: str) -> bool:
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"""
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Legt eine neue leere GPKG-Datei an.
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"""
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if not path:
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return False
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try:
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write_text(path, "")
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except Exception:
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return False
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self.set_verfahrens_db(path)
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return True
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# -------------------------------
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# Lokale Linkliste
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# -------------------------------
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def load_linkliste(self) -> Optional[str]:
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"""
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Lädt die gespeicherte lokale Linkliste.
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"""
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path = get_variable("linkliste", scope="project")
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if path and file_exists(path):
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return path
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return None
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def set_linkliste(self, path: Optional[str]) -> None:
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"""
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Speichert oder löscht die lokale Linkliste.
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"""
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if path:
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set_variable("linkliste", path, scope="project")
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else:
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set_variable("linkliste", "", scope="project")
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# -------------------------------
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# Verfahrensgebiet-Layer
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# -------------------------------
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def save_verfahrensgebiet_layer(self, layer) -> None:
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"""
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Speichert die ID des Verfahrensgebiet-Layers.
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Ungültige Layer werden ignoriert.
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"""
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if layer is None:
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set_variable("verfahrensgebiet_layer", "", scope="project")
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return
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if not hasattr(layer, "id") or not callable(layer.id):
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set_variable("verfahrensgebiet_layer", "", scope="project")
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return
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try:
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layer_id = layer.id()
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except Exception:
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set_variable("verfahrensgebiet_layer", "", scope="project")
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return
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if not layer_id:
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set_variable("verfahrensgebiet_layer", "", scope="project")
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return
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set_variable("verfahrensgebiet_layer", layer_id, scope="project")
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def load_verfahrensgebiet_layer_id(self) -> Optional[str]:
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"""
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Lädt die gespeicherte Layer-ID.
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"""
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value = get_variable("verfahrensgebiet_layer", scope="project")
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return value or None
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def is_valid_verfahrensgebiet_layer(self, layer) -> bool:
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"""
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Prüft, ob ein Layer als Verfahrensgebiet geeignet ist.
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"""
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if not layer_exists(layer):
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return False
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layer_type = get_layer_type(layer)
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return layer_type == "vector"
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