Prevent removing a tag being used

1 files changed, 20 insertions, 9 deletions

diff --git a/src/gui/tags/panel/table/menu.py b/src/gui/tags/panel/table/menu.py
index 2238444..6bf812e 100644
--- a/src/gui/tags/panel/table/menu.py
+++ b/src/gui/tags/panel/table/menu.py
@@ -1,25 +1,36 @@
 from PyQt5 import QtWidgets, QtCore
 
+from model.tag import Tag, ValidTagForm
+import database
 import db.tags
+import db.task_tags
 import gui.tags.panel.dialog
-from model.tag import Tag, ValidTagForm
 
 def open(table, update_tag_signal, position):
     rows = set([index.row() for index in table.selectedIndexes()])
 
     menu = QtWidgets.QMenu(table)
 
+    actions = 0
+
     if len(rows) == 1:
         modify_action = menu.addAction(gui.icon.dialog_open(menu.style()), 'modify')
+        actions += 1
     else:
         modify_action = QtWidgets.QAction(menu)
 
-    delete_action = menu.addAction(gui.icon.trash(menu.style()), 'delete')
+    tags = table.model().row_ids(rows)
+    if not db.task_tags.one_is_used(database.cursor(), tags):
+        delete_action = menu.addAction(gui.icon.trash(menu.style()), 'delete')
+        actions += 1
+    else:
+        delete_action = QtWidgets.QAction(menu)
 
-    action = menu.exec_(table.mapToGlobal(position + QtCore.QPoint(15, 20)))
-    if action == modify_action and len(rows) == 1:
-        row = list(rows)[0]
-        tag = table.model().get_at(row)
-        gui.tags.panel.dialog.update(table, update_tag_signal, row, tag).exec_()
-    elif action == delete_action:
-        gui.tags.panel.dialog.show_delete(table, rows)
+    if actions > 0:
+        action = menu.exec_(table.mapToGlobal(position + QtCore.QPoint(15, 20)))
+        if action == modify_action and len(rows) == 1:
+            row = list(rows)[0]
+            tag = table.model().get_at(row)
+            gui.tags.panel.dialog.update(table, update_tag_signal, row, tag).exec_()
+        elif action == delete_action:
+            gui.tags.panel.dialog.show_delete(table, rows)