Apply 'new item' rules in project tree (#1406)

novelwriter/gui/projtree.py

@@ -38,6 +38,7 @@ from PyQt5.QtWidgets import (
     QMenu, QShortcut, QSizePolicy, QToolButton, QTreeWidget, QTreeWidgetItem,
     QVBoxLayout, QWidget
 )
+from novelwriter.core.item import NWItem
 
 from novelwriter.enum import nwDocMode, nwItemType, nwItemClass, nwItemLayout, nwAlert, nwWidget
 from novelwriter.constants import nwHeaders, nwUnicode, trConst, nwLabels
@@ -108,6 +109,9 @@ class GuiProjectView(QWidget):
         self.keyContext.setContext(Qt.WidgetShortcut)
         self.keyContext.activated.connect(lambda: self.projTree.openContextOnSelected())
 
+        # Signals
+        self.selectedItemChanged.connect(self.projBar._treeSelectionChanged)
+
         # Function Mappings
         self.emptyTrash = self.projTree.emptyTrash
         self.requestDeleteItem = self.projTree.requestDeleteItem
@@ -418,6 +422,23 @@ class GuiProjectToolBar(QWidget):
 
         return
 
+    ##
+    #  Slots
+    ##
+
+    @pyqtSlot(str)
+    def _treeSelectionChanged(self, tHandle):
+        """Toggle the visibility of the new item enties for novel
+        documents. They should only be visible if novel documents can
+        actually be added.
+        """
+        nwItem = self.theProject.tree[tHandle]
+        allowDoc = isinstance(nwItem, NWItem) and nwItem.documentAllowed()
+        self.aAddEmpty.setVisible(allowDoc)
+        self.aAddChap.setVisible(allowDoc)
+        self.aAddScene.setVisible(allowDoc)
+        return
+
 # END Class GuiProjectToolBar