ui/__init__.py

@@ -1,2 +1,3 @@
 from .tab_projekt import TabProjektWidget
-from .dockmanager import DockManager
+from .dockmanager import DockManager
+from .navigation import Navigation

ui/navigation.py

@@ -0,0 +1,75 @@
+from qgis.PyQt.QtWidgets import QMenu, QToolBar, QAction
+from qgis.PyQt.QtGui import QIcon
+from qgis.utils import iface
+
+_shared_toolbar = None  # globale Toolbar-Instanz
+_shared_menu = None     # globale Menü-Instanz
+
+class Navigation:
+    TITLE = "LNO Sachsen"
+
+    def __init__(self):
+        self.menu = self._get_or_create_menu()
+        self.toolbar = self._get_or_create_toolbar()
+
+    def _get_or_create_menu(self):
+        global _shared_menu
+        if _shared_menu:
+            return _shared_menu
+
+        menubar = iface.mainWindow().menuBar()
+        for action in menubar.actions():
+            if action.menu() and action.text() == self.TITLE:
+                _shared_menu = action.menu()
+                return _shared_menu
+
+        menu = QMenu(self.TITLE, iface.mainWindow())
+        menu.setObjectName(self.TITLE)
+        menubar.addMenu(menu)
+        _shared_menu = menu
+        return menu
+
+    def _get_or_create_toolbar(self):
+        global _shared_toolbar
+        if _shared_toolbar:
+            return _shared_toolbar
+
+        main_window = iface.mainWindow()
+        toolbar = main_window.findChild(QToolBar, self.TITLE)
+        if not toolbar:
+            toolbar = QToolBar(self.TITLE, main_window)
+            toolbar.setObjectName(self.TITLE)
+            main_window.addToolBar(toolbar)
+
+        _shared_toolbar = toolbar
+        return toolbar
+
+    def add_action(self, text, callback, icon=None, tooltip=None):
+        # Menüeintrag
+        if not any(a.text() == text for a in self.menu.actions()):
+            action = QAction(icon, text, iface.mainWindow()) if icon else QAction(text, iface.mainWindow())
+            if tooltip:
+                action.setToolTip(tooltip)
+            action.triggered.connect(callback)
+            self.menu.addAction(action)
+
+        # Symbolleistenaktion
+        if not any(a.text() == text for a in self.toolbar.actions()):
+            action = QAction(icon, text, iface.mainWindow()) if icon else QAction(text, iface.mainWindow())
+            if tooltip:
+                action.setToolTip(tooltip)
+            action.triggered.connect(callback)
+            self.toolbar.addAction(action)
+
+    def remove_action(self, text):
+        # Menüeintrag entfernen
+        for act in self.menu.actions():
+            if act.text() == text:
+                self.menu.removeAction(act)
+                break
+
+        # Symbolleistenaktion entfernen
+        for act in self.toolbar.actions():
+            if act.text() == text:
+                self.toolbar.removeAction(act)
+                break